SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS October 2012 No.OCH530 HFC utilized TECHNICAL & SERVICE MANUAL R410A R410A Outdoor unit [Model names] SUZ-KA25VA3 SUZ-KA35VA3 SUZ-KA50VA3 SUZ-KA60VA3 SUZ-KA71VA3 NOTE: • This service manual describes technical data of the outdoor units. [Service Ref.] SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH CONTENTS Indication of model name SUZ-KA25VA3.TH SUZ-KA35VA3.TH 1. COMBINATION OF INDOOR AND OUTDOOR UNITS.......2 2. TECHNICAL CHANGES ....................................3 3. PART NAMES AND FUNCTIONS......................6 4. SPECIFICATION................................................. 7 5. NOISE CRITERIA CURVES............................... 9 6. OUTLINES AND DIMENSIONS........................10 7. WIRING DIAGRAM...........................................12 8. REFRIGERANT SYSTEM DIAGRAM.............. 15 9. ACTUATOR CONTROL....................................18 10. SERVICE FUNCTIONS.....................................19 11. TROUBLESHOOTING...................................... 19 12. DISASSEMBLY INSTRUCTIONS..................... 49 PARTS CATALOG (OCB530) 1 COMBINATION OF INDOOR AND OUTDOOR UNITS INDOOR UNIT SERVICE MANUAL Outdoor unit Heat pump type Indoor unit SUZService Ref. Service KA25VA3.TH KA35VA3.TH KA50VA3.TH KA60VA3.TH KA71VA3.TH Manual No. — SLZ-KA25VA(L).TH — SLZ-KA35VA(L).TH SLZ-KA50VA(L).TH Heat pump without electric heater SLZ-KA25VAL2.TH OC320 — — SLZ-KA50VALR3.TH — — OCH493 SLZ-KA50VAQR2.TH — HWE0711 SEZ-KD50VA(L)R2.TH BWE102050 SEZ-KD60VA(L)R2.TH SEZ-KD71VA(L)R2.TH — — HWE1008 SEZ-KD50VAQR2.TH BWE102040 SEZ-KD60VAQR2.TH SEZ-KD71VAQR2.TH — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — SEZ-KD25VAQR2.TH SEZ-KD35VAQR2.TH — — — SEZ-KD25VA(L)R2.TH SEZ-KD35VA(L)R2.TH — — SLZ-KA25VAQ2.TH SLZ-KA35VAQR2.TH — — — SLZ-KA35VALR3.TH — — — — — — — — — — — — — (NOTE) Please refer to the service manual of indoor unit or the technical data book for the combination data. OCH530 2 2 TECHNICAL CHANGES INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT oil Refrigerant Refrigerant • This room air conditioner adopts an HFC refrigerant (R410A) which never destroys the ozone layer. • Pay particular attention to the following points, though the basic installation procedure is same as that for R22 conditioners. 1 As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/materials are required. Refer to the table below. 2 Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and installation, since it is more susceptible to contaminations than R22. 3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant piping.) 4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent composition change. Refrigerant Composition (Ratio) Refrigerant handling Chlorine Safety group (ASHRAE) Molecular weight Boiling point (°C) Steam pressure [25°C](Mpa) Saturated steam density [25°C](Kg/*) Combustibility ODP *1 GWP *2 Refrigerant charge method Additional charge on leakage Kind Color Smell *1: Ozone Depletion Potential *2: Global Warming Potential New refrigerant R410A HFC-32: HFC-125 (50%:50%) Pseudo-azeotropic refrigerant Not included A1/A1 72.6 -51.4 1.557 64 Non combustible 0 1730 From liquid phase in cylinder Possible Incompatible oil None None : based on CFC-11 : based on CO2 New Specification Compressor Previous refrigerant R22 R22 (100%) Single refrigerant Included A1 86.5 -40.8 0.94 44.4 Non combustible 0.055 1700 Gas phase Possible Compatible oil Light yellow None Current Specification The incompatible refrigerant oil easily separates from Since refrigerant and refrigerant oil are compatible with refrigerant and is in the upper layer inside the suction muffler. each other, refrigerant oil backs to the compressor through Raising position of the oil back hole enables to back the the lower position oil back hole. refrigerant oil of the upper layer to flow back to the compressor. Suction muffler Suction muffler Compressor Oil back hole Compressor Refrigerant oil Refrigerant Oil back hole Refrigerant oil /Refrigerant NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system). The conversion factor is: 1 (MPa [Gauge]) =10.2 (kgf/cm2 [Gauge]) OCH530 3 Conversion chart of refrigerant temperature and pressure (MPa [Gauge]) 4.0 Saturated liquid pressure 3.5 R410A 3.0 R22 2.5 2.0 NOTE: The unit of pressure has been changed to MPa on the international system of units (SI unit system). 1.5 1.0 The conversion factor is: 1 (MPa [Gauge]) =10.2 (kgf/cm2 [Gauge]) 0.5 0.0 -0.5 -30 -20 -10 0 10 20 30 40 50 60 () 1. Tools dedicated for the air conditioner with R410A refrigerant The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools. The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads. R410A tools Description Can R22 tools be used? R410A has high pressures beyond the measurement range of existing gauges. Port diameters have been changed to prevent any other refrigerant from being charged into the unit. Gauge manifold No Charge hose No Gas leak detector No Hose material and cap size have been changed to improve the pressure resistance. Dedicated for HFC refrigerant. Yes 6.35 mm and 9.52 mm No 12.7 mm and 15.88 mm Flare tool Yes Clamp bar hole has been enlarged to reinforce the spring strength in the tool. Flare gauge Vacuum pump adapter Electronic scale for refrigerant charging New Provided for flaring work (to be used with R22 flare tool). Provided to prevent the back flow of oil. This adapter enables you to use vacuum pumps. It is difficult to measure R410A with a charging cylinder because the refrigerant bubbles due to high pressure and high-speed vaporization Torque wrench New New No: Not substitutable for R410A OCH530 Yes: Substitutable for R410A 4 2. Refrigerant piping 1 Specifications Use the refrigerant pipes that meet the following specifications. Outside diameter mm 6.35 9.52 9.52 12.7 15.88 Pipe For liquid For gas Wall thickness mm 0.8 0.8 0.8 0.8 1.0 Insulation material Heat resisting foam plastic Specific gravity 0.045 Thickness 8 mm • Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less than 0.8mm, as the pressure resistance is insufficient. 2 Flaring work and flare nut Flaring work for R410A pipe differs from that for R22 pipe. For details of flaring work, refer to Installation manual “FLARING WORK”. Dimension of flare nut (mm) Pipe diameter (mm) R410A 6.35 9.52 12.7 15.88 R22 17 22 24 27 17 22 26 29 3. Refrigerant oil Apply the special refrigerant oil (accessories: packed with indoor unit) to the flare and the union seat surfaces. 4. Air purge Do not discharge the refrigerant into the atmosphere. Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant circuit. Use the vacuum pump for air purging for the purpose of environmental protection. 5. Additional charge For additional charging, charge the refrigerant from liquid phase of the gas cylinder. If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the outdoor unit. In this case, ability of the refrigerating cycle decreases or normal operation can be impossible. However, charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly. Union Stop valve Indoor unit Liquid pipe Gas pipe Refrigerant gas cylinder operating valve Outdoor unit Service port Gauge manifold valve (for R410A) Charge hose (for R410A) Refrigerant gas cylinder for R410A with siphon Refrigerant (liquid) Electronic scale for refrigerant charging OCH530 5 3 PART NAMES AND FUNCTIONS SUZ-KA25VA3.TH SUZ-KA35VA3.TH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet Model Drain socket OCH530 SUZ-KA·VA3.TH 1 6 4 SPECIFICATION Outdoor model SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Power supply Single phase 230V, 50Hz Model KNB073FKFMC Output W Cooling Compressor Current *1 Heating Refrigeration oil (Model) A L Dimensions W × H × D mm Weight kg Cooling Sound level *1 6.62 8.02 3.24 4.09 5.75 6.37 8.13 0.31 (FV50S) 0.27 (FV50S) Fan speed RC0J60-BD RC0J60-BC 0.24 0.29 0.84 0.84 0.83 0.27 0.28 0.93 0.93 0.82 800 × 550 × 285 35 840 × 880 × 330 50 53 3,492 3,426 Med. 1,806 2,868 3,066 3,006 1,602 1,692 1,512 2,778 2,952 2,892 2,892 m³/h 30 1,170 1,038 2,106 Med. 1,806 1,770 2,778 2,952 Low 1,452 1,326 2,124 2,226 Cooling 47 49 52 55 48 50 52 55 740 810 840 950 Heating dB(A) Med. 740 810 Low 740 490 860 900 rpm Med. 740 770 Low 600 610 Fan speed regulator Refrigerant filling capacity (R410A) 2,280 840 480 450 810 810 620 650 3 kg 0.80 1.15 NOTE : Test conditions are based on ISO 5151 Cooling : Indoor D.B. 27°C W.B. 19°C Outdoor D.B. 35°C Heating : Indoor D.B. 20°C Outdoor D.B. 7°C W.B. 6°C Refrigerant piping length (one way): 5 m *1 Measured under rated operating frequency. OCH530 0.4 (FV50S) 54 High Heating 0.35 (FV50S) 2,868 High Cooling 1,200 5.58 1,806 High Heating 900 650 4.06 High Low Air flow *1 Special remarks A SNB172FEKMT 550 RC0J50-FA Current Cooling *1 Heating SNB130FGBMT 2.76 Model Fan motor KNB092FFAMC 7 1.45 1.55 1.90 Specifications and rating conditions of main electric parts SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Model Item (C61) Smoothing capacitor Diode module Fuse — — 620+ 420V (C62, C63) 620+ 420V 620+ 420V 620+ 420V — — (CB1, 2, 3) — — — 560μF 450V 560μF 350V 15A 600V 15A 600V 25A 600V — — (F61) T20A L250V T20A L250V T20A L250V — — (F62) — — — T20A L250V T20A L250V T3.15A L250V T3.15A L250V T3.15A L250V — — 15A 600V 15A 600V 20A 600V — — — — 8A 600V 8A 600V 8A 600V 5A 600V 5A 600V (DB61) (F701, F801, F901) (IC700) (IPM) Inteligent power module (IC932) Power factor controller (IC820) (PFC) Expansion valve coil (L61) (L) R.V. coil — — 20A 600V 20A 600V 20A 600V — — DC12V 18mH 23mH 23mH — — — — — 340μH 20A 340μH 20A 33Ω (TB1, TB2) — — — 3P 3P (TB) 5P 5P 5P — — (X63) 3A 250V 3A 250V 3A 250V — — (X601) — — — 3A 250V 3A 250V (X602) — — — 3A 250V 3A 250V 20A 250V (21S4) OCH530 — 20A 600V 20A 600V (X64) Relay — — (PTC64, PTC65) Terminal block — 20A 600V (LEV) Reactor Current-Limiting PTC thermistoe SUZ-KA25VA3.TH SUZKA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH AC220-240V 8 5 NOISE CRITERIA CURVES SUZ-KA35VA3.TH SUZ-KA25VA3.TH OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR High Med. SPL(dB(A)) COOLING 47 HEATING 48 FAN SPEED FUNCTION LINE High Med. OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR FAN SPEED FUNCTION 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 NC-20 NC-10 10 63 125 250 500 1000 2000 4000 8000 COOLING 52 HEATING 52 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 10 63 125 80 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 10 63 125 250 250 500 1000 2000 NC-20 4000 500 1000 2000 4000 8000 SPL(dB(A)) COOLING 55 HEATING 55 LINE 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 NC-20 NC-10 10 63 125 BAND CENTER FREQUENCIES, Hz 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz Test conditions Cooling: Dry-bulb temperature 35°C Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C OUTDOOR UNIT 1m MICROPHONE OCH530 8000 SUZ-KA71VA3.TH FAN SPEED FUNCTION LINE 90 NC-10 NC-20 NC-10 High 70 50 80 SUZ-KA60VA3.TH OCTAVE BAND SOUND PRESSURE LEVEL, 0dB re 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR High HEATING LINE BAND CENTER FREQUENCIES, Hz SUZ-KA50VA3.TH SPL(dB(A)) 49 90 BAND CENTER FREQUENCIES, Hz FAN SPEED FUNCTION SPL(dB(A)) COOLING 9 6 OUTLINES AND DIMENSIONS SUZ-KA25VA3.TH SUZ-KA35VA3.TH Unit: mm REQUIRED SPACE Basically open 100mm or more without any obstruction in front and on both sides of the unit. Bolt pitch for installation 304~325 44 Air in 40 2-Oval holes 10×21 Open two sides of left, right, or rear side. Air out 22.3 ore or m mm 0 0 2 17.5 Service panel 23 Liquid refrigerant pipe joint Refrigerant pipe (flared) :6.35 Handle 35 69 302.5 Gas refrigerant pipe joint Refrigerant pipe (flared) :9.52 99.5 10 164.5 280 150 170.5 Service port 500 Bolt pitch for installation 800 OCH530 43 285 100 mm or m ore Drain hole :42 550 344.5 400 Air in 10 re r mo mo m 100 350 mm or m ore SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Unit: mm Open as a rule 500mm or more if the front and both sides are open REQUIRED SPACE 417.5 Drain hole 40 50 Bolt pitch for installation 360 42 Air in 100 mm 100mm or more 200mm or more if there are obstacles to both sides or m ore Air out 2-Oval holes 10 21 175 350 500 840 Open as a rule 500mm or more if the back, both sides and top are open 81 109 mm or m ore Service panel Liquid refrigerant pipe joint Refrigerant pipe (flared) Ø 6.35...(SUZ-KA50, 60VA3) Ø 9.52...(SUZ-KA71VA3) 880 35 164.5 99.5 44 452 330 Air in 195 OCH530 11 Gas refrigerant pipe joint Refrigerant pipe (flared) Ø 12.7...(SUZ-KA50VA3) Ø 15.88...(SUZ-KA60, 71VA3) 7 WIRING DIAGRAM SUZ-KA25VA3.TH SUZ-KA35VA3.TH OCH530 12 SUZ-KA50VA3.TH OCH530 13 SUZ-KA60VA3.TH SUZ-KA71VA3.TH OCH530 14 8 REFRIGERANT SYSTEM DIAGRAM SUZ-KA25VA3.TH Unit: mm Refrigerant pipe ø9.52 (with heat insulator) 4-way valve Muffler Stop valve (with service port) Discharge temperature thermistor RT62 Flared connection Outdoor heat exchanger Muffler Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Compressor Defrost thermistor RT61 Flared connection Refrigerant pipe ø6.35 (with heat insulator) Strainer #100 LEV Capillary tube ø3.0×ø2.0×240 R.V. coil heating ON cooling OFF Stop valve (with strainer) Refrigerant flow in cooling Refrigerant flow in heating SUZ-KA35VA3.TH Unit: mm Refrigerant pipe ø9.52 (with heat insulator) 4-way valve Muffler Stop valve (with service port) Discharge temperature thermistor RT62 Flared connection Outdoor heat exchanger Muffler Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Compressor Defrost thermistor RT61 Capillary tube ø3.0×ø1.8×600(×2) Flared connection Refrigerant pipe ø6.35 (with heat insulator) OCH530 Strainer #100 Capillary tube ø3.0×ø2.0×240 LEV Stop valve (with strainer) R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating 15 SUZ-KA50VA3.TH Unit: mm Muffler 4-way valve #100 Refrigerant pipe ø12.7 (with heat insulator) Stop valve (with service port) Flared connection Discharge temperature thermistor RT62 Outdoor heat exchanger Defrost thermistor RT61 Ambient temperature thermistor RT65 Compressor Outdoor heat exchanger temperature thermistor RT68 Flared connection Strainer #100 Stop valve Refrigerant pipe ø6.35 (with heat insulator) LEV Muffler Strainer #100 Capillary tube ø4.0×ø2.4×100 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating SUZ-KA60VA3.TH SUZ-KA71VA3.TH Unit: mm Refrigerant pipe (with heat insulator) ø15.88 Muffler 4-way valve #100 Stop valve (with service port) Flared connection Discharge temperature thermistor RT62 Defrost thermistor RT61 Outdoor heat exchanger Ambient temperature thermistor RT65 Compressor Outdoor heat exchanger temperature thermistor RT68 Flared connection Strainer #100 Stop valve Refrigerant pipe (with heat insulator) ø6.35...(SUZ-KA60VA3) ø9.52...(SUZ-KA71VA3) OCH530 LEV Strainer #100 Capillary tube ø4.0×ø2.4×100 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating 16 SUZ-KA25VA3.TH SUZ-KA60VA3.TH SUZ-KA35VA3.TH SUZ-KA71VA3.TH SUZ-KA50VA3.TH MAX. REFRIGERANT PIPING LENGTH Refrigerant piping: m Max. Height difference B Max. Length A Models SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH 20 12 Gas Piping size O.D: mm Liquid 9.52 12.7 30 30 15.88 6.35 9.52 MAX. HEIGHT DIFFERENCE Indoor unit * Max. Height difference B Max. Length A Outdoor unit * Height difference limitations are binding regardless of which unit, indoor or outdoor, is position high. ADDITIONAL REFRIGERANT CHARGE (R410A: g) Models SUZ-KA25VA3.TH SUZ-KA35VA3.TH Outdoor unit precharged 800 1,150 7m 0 0 Refrigerant piping length (one way) 9m 10m 11m 12m 13m 14m 60 90 120 150 180 210 60 90 120 150 180 210 8m 30 30 15m 240 240 20m 390 390 Calculation: Xg=30g/mo(Refrigerant piping length(m)-7) Models SUZ-KA50VA3.TH SUZ-KA60VA3.TH Outdoor unit precharged 1,600 1,800 7m 0 0 10m 60 60 Refrigerant piping length (one way) 15m 20m 25m 160 260 360 160 260 360 30m 460 460 Calculation : Xg=20g/m o (Refrigerant piping length(m)–7) Models SUZ-KA71VA3.TH Outdoor unit precharged 1,800 7m 0 10m 165 Refrigerant piping length (one way) 15m 20m 25m 440 715 990 30m 1,265 Calculation : Xg=55g/m o (Refrigerant piping length(m)-7) OCH530 17 9 ACTUATOR CONTROL SUZ-KA25VA3.TH SUZ-KA60VA3.TH SUZ-KA35VA3.TH SUZ-KA71VA3.TH SUZ-KA50VA3.TH 9-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running. 5 seconds 15 seconds ON Compressor OFF ON Outdoor fan OFF 9-2. R.V. COIL CONTROL Heating . . . . . . . . . . . . . . . . . ON Cooling . . . . . . . . . . . . . . . . . OFF Dry . . . . . . . . . . . . . . . . . . . . OFF NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor. <COOL> <HEAT> 5 seconds Compressor ON OFF R.V.coil ON OFF 5 seconds Outdoor fan ON OFF motor 9-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Discharge temperature thermistor Purpose Protection Cooling: Coil frost prevention Indoor coil temperature thermistor Heating: High pressure protection Defrost thermistor Heating: Defrosting Fin temperature thermistor Ambient temperature thermistor Protection Outdoor heat exchanger temperature thermistor OCH530 Cooling: Low ambient temperature operation Cooling: Low ambient temperature operation Cooling: High pressure protection 18 Compressor LEV ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ Actuator Outdoor fan motor ○ ○ ○ ○ ○ R.V.coil Indoor fan motor ○ ○ 10 SERVICE FUNCTIONS SUZ-KA25VA3.TH SUZ-KA50VA3.TH SUZ-KA35VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to 11-6-1.) Defrost fi nish temperature (°C) Jumper wire JS 11 Soldered (Initial setting) None (cut) SUZ-KA25VA3.TH SUZ-KA35VA3.TH 5 10 SUZ-KA50VA3.TH 9 18 SUZ-KA60VA3.TH SUZ-KA71VA3.TH 10 18 TROUBLESHOOTING SUZ-KA25VA3.TH SUZ-KA50VA3.TH SUZ-KA35VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH 11-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care the following during servicing. 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and turn off the breaker. 2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. 3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor. 4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wire Housing point 3. Troubleshooting procedure 1) First, check if the OPERATION INDICATOR lamp is blinking on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is blinking on and off before starting service work. 2) Before servicing check that the connector and terminal are connected properly. 3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration. 4) When troubleshooting, refer to 11-2. and 11-3. OCH530 19 11-2. FAILURE MODE RECALL FUNCTION As this air conditioner has a function to memorize all the failures that had happened, the latest failure detail can be recalled by following the procedures below. Use this function when the check code is not displayed with wired remote controller or the remote controller at use is wireless type. 11-2-1. Flow chart of the indoor/outdoor unit failure mode recall function Operational procedure (For wireless remote controller) TO O While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons since all LCD in operation display section of the remote controller is displayed after 3 seconds. TO O CO OL CT FAN Setting up the failure mode recall function AUTO COOL HEAT DRY VANE SELE TIME ET RES Turn ON the power supply. While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons since all LCD in operation display section of the remote controller is displayed after 3 seconds. h *1 Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed). No (OFF) Does OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: Either indoor or outdoor unit is abnormal. Beep sounds are emitted at the same timing of the blinking of OPERATION INDICATOR lamp. *2 Judgment of indoor/outdoor abnormality ON/OFF TOO WARM TOO COOL *1. Regardless of normal or abnormal, a short beep is emitted once as the signal is received. Indoor unit is normal. There is a possibility that the plasma or outdoor unit is abnormal. Confirm the failure detail on the LED display of the outdoor controller board.(refer to 11-2-4.) Yes (Blinks) Before blinking, does POWER lamp stay ON for 3 seconds? Stays ON for 3 seconds (without beep): The outdoor unit is abnormal. Yes No The indoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point. Make sure to check at least two consecutive blinking cycles. *2 The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point (11-2.3.). Make sure to check at least two consecutive blinking cycles. *3 Releasing the failure mode recall function Release the failure mode recall function by the following procedures. With the remote controller headed towards the indoor unit, press any button that is not used in this failure mode recall function (e.g. TIMER button) . OR Turn OFF the power supply and turn ON it again. Press RESET button of the remote controller. OPERATION INDICATOR lamp Repair the defective parts. Note1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. *2. Blinking pattern when the indoor unit is abnormal:[Output pattern A] Beeper sounds OPERATION INDICATOR lamp blink pattern Beep Beep Beep Beep 1st 2nd Beep 3 rd n Beep th 1 st Beep 2 nd · · · Repeated Off On On On On On Off On 0.5 sec. Approx. 2.5 sec. 0.5 sec. 0.5 sec. Self-check Approx. 2.5 sec.0.5 sec. 0.5 sec. 0.5 sec. starts (Start signal Number of blinks/beeps in pattern indicates the check Number of blinks/beeps in pattern indicates received) code in the next page (i.e., n=5 for “P5”) the check code in the next page *3.Blinking pattern when the outdoor unit is abnormal:[Output pattern B] Beeper sounds OPERATION INDICATOR lamp blink pattern Beep Beep Beep Beep 1 st Off Self-check Approx. 2.5 sec. starts (Start signal received) OCH530 On Approx. 3 sec. 2 nd 3 rd On On On 0.5 sec. 0.5 sec.0.5 sec. Beep Beep n th 1 On Off 0.5 sec. Approx. 2.5 sec. Number of blinks/beeps in pattern indicates the check code in the next page (i.e., n=5 for “U2”) 20 On Approx. 3 sec. st Beep 2 nd · · · Repeated On On 0.5 sec. 0.5 sec. Number of blinks/beeps in pattern indicates the check code in the next page 11-2-2. Wired remote controller ■ PAR-30MAA The functions of the function buttons change depending on the screen. Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen. When the system is centrally controlled, the button function guide that corresponds to the locked button will not appear. <Main display> <Main menu> Fri Room Cool Set temp. Auto Mode Temp. Fan Function buttons F1 F2 F3 Main menu Vane·Louver·Vent. (Lossnay) High power Timer Weekly timer OU silent mode Main display: Cursor Page Function guide F4 ON / OFF lamp ON / OFF button This lamp lights up in green while the unit is in operation. It blinks while the remote controller is starting up or when there is an error. Press to turn ON/OFF the indoor unit. SELECT button Press to save the setting. Function button F1 Main display : Press to change the operation mode. Main menu : Press to move the cursor down. RETURN button Press to return to the previous screen. Function button F2 MENU button Main display : Press to decrease temperature. Main menu : Press to move the cursor up. Press to bring up the Main menu. Backlit LCD Function button F3 Operation settings will appear. When the backlight is off, pressing any button turns the backlight on and it will stay lit for a certain period of time depending on the screen. When the backlight is off, pressing any button turns the backlight on and does not perform its function. (except for the (ON / OFF) button) OCH530 Main 21 Main display : Press to increase temperature. Main menu : Press to go to the previous page. Function button F4 Main display : Press to change the fan speed. Main menu : Press to go to the next page. Self check operation 1 Select "Service" from the Main menu, and press the button. Select "Self check" with the F1 or F2 button, and press the Service menu Test run Input maintenance info. Function setting Check Self check button. Main menu: Cursor F1 2 With the F1 or F2 button, enter the refrigerant address, and press the button. F2 F3 F4 Self check Ref. address Select: Address 3 Error code, unit number, attribute will appear. Self check Ref. address "-" will appear if no error history is available. Error Unt # Grp.IC Return: Reset When there is no error history Self check M-NET address ---Error Contact - Grp. -- Return: Reset 4 Resetting the error history. Self check Ref. address Press the F4 button (Reset) on the screen that shows the error history. Delete error history? A confirmation screen will appear asking if you want to delete the error history. Cancel Press the F4 button (OK) to delete the error history. Self check Ref. address If deletion fails, "Request rejected" will appear. "Unit not exist" will appear if no indoor units that are correspond to the entered address are found. Error history deleted Return: Navigating through the screens • To go back to the Main menu .......... • To return to the previous screen ....... OCH530 button button 22 OK ■ PAR-21MAA °C °C SIMPLE TEMP. MENU BACK MONITOR/SET ON/OFF ON/OFF CLOCK PAR-21MAA FILTER DAY CHECK button Refrigerant address TEMP. button IC: Indoor unit OC: Outdoor unit Check code Turn on the power. Press the [CHECK] button twice. Set refrigerant address with [TEMP] button if system control is used. Press the [ON/OFF] button to stop the self-check. CHECK TEST OPERATION CLEAR 11-2-3. Failure mode table (Wireless remote controller/Wired remote controller) [Output pattern A] Errors detected by indoor unit Wired remote controller Wireless remote controller Beeper sounds/OPERATION INDICATOR Symptom lamp blinks (Number of times) 1 Intake sensor error P1 Pipe (TH2) sensor error P2 2 Pipe (TH5) sensor error P9 3 Indoor/outdoor unit communication error E6,E7 4 Drain sensor error/Float switch connector open P4 5 Drain pump error P5 6 Freezing/Overheating protection operation P6 7 Communication error between indoor and outdoor units EE 8 Pipe temperature error P8 9 Remote controller signal receiving error E4, E5 10 – – 11 – – 12 Indoor unit control system error (memory error, etc.) Fb (FB) * 14 Refrigerant circuit abnormal PL – Remote controller transmission error E0, E3 – Remote controller control board error E1, E2 [Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.) Check code Remark Wired remote controller Wireless remote controller Check code E9 UP U3,U4 UF U2 U1,Ud (UD) * U5 U8 U6 U7 Beeper sounds/OPERATION INDICATOR lamp blinks (Number of times) 1 2 3 4 5 6 7 8 9 10 U9,UH 11 – – Others 12 13 14 Symptom Remark Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit) Compressor overcurrent interruption Open/short of outdoor unit thermistors Compressor overcurrent interruption (When compressor locked) Abnormal high discharging temperature/insufficient refrigerant Abnormal high pressure (63H worked)/Overheating protection operation Abnormal temperature of heat sink For details, check the LED display Outdoor unit fan protection stop of the outdoor controller board. Compressor overcurrent interruption/Abnormal of power module Abnormality of super heat due to low discharge temperature Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/Current sensor error – – Other errors • If the beeper does not sound again after the initial two beeps to confirm the self-check start signal was received and the OPERATION INDICATOR lamp does not come on, there are no error records. • If the beeper sounds three times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial two beeps to confirm the self-check start signal was received, the specified refrigerant address is incorrect. • On wireless remote controller The continuous buzzer sounds from receiving section of indoor unit. Blink of operation lamp • On wired remote controller Check code displayed in the LCD. * The check code in the parenthesis indicates PAR-30MAA model. OCH530 23 11-2-4. Outdoor unit failure mode table SUZ-KA25VA3.TH Check code (Wired remote contoller) — — SUZ-KA35VA3.TH Abnormal point (Failure mode/protection) LED indication (Outdoor P.C. board) Condition Remedy None (Normal) — — — Indoor/outdoor communication, receiving error — Any signals from the inverter P.C. •Refer to 11-5. How board cannot be received normally for to check miswiring and 3 minutes. serial signal error. Indoor/outdoor communication, receiving error — Although the inverter P.C. board sends •Refer to 11-5. How signal "0", signal "1" has been received to check miswiring and 30 consecutive times. serial signal error. Outdoor power system — UP U3 U4 Discharge temperature thermistor Defrost thermistor 1-time flash every 2.5 seconds Fin temperature thermistor 3-time flash 2.5 seconds OFF P.C. board temperature thermistor 4-time flash 2.5 seconds OFF Ambient temperature thermistor 2-time flash 2.5 seconds OFF Outdoor heat exchanger temperature thermistor Overcurrent UF Compressor synchronous abnormality (Compressor start-up failure protection) U2 11-time flash 2.5 seconds OFF 12-time flash 2.5 seconds OFF — High pressure — UD Fin temperature U5 7-time flash 2.5 seconds OFF P.C. board temperature Outdoor fan motor U8 FC — Waveform of compressor current is distorted. — — ○ ○ ○ ○ ○ ○ • Reconnect compressor connector. • Refer to 11-5. "How to check inverter/ compressor". • Check stop valve. — ○ • Reconnect compressor connector. • Refer to 11-5. "How to check inverter/ compressor". — ○ — ○ — ○ — ○ — ○ ○ ○ — ○ — ○ ○ ○ • Reconnect connectors. • Refer to 11-5. "How to check inverter/ compressor". • Check stop valve. • Refer to 11-5. "Check of outdoor thermistors". Defective outdoor thermistors can be identified by checking the blinking pattern of LED. Temperature of discharge temperature thermistor exceeds 116°C, compressor stops. Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later. • Check refrigerant circuit and refrigerant amount. • Refer to 11-5. "Check of LEV". Temperature indoor coil thermistor exceeds 70°C in HEAT mode. Temperature defrost thermistor exceeds 70°C in COOL mode. • Check refrigerant circuit and refrigerant amount. • Check stop valve. Temperature of fin temperature thermistor on the inverter P.C. board exceeds 75 ~ 86°C. • Check around outdoor unit. • Check outdoor unit air passage. Temperature of P.C. board temperature • Refer to 11-5. "Check of outdoor fan motor". thermistor on the inverter P.C. board exceeds 72 ~ 85°C. Outdoor fan has stopped 3 times in a • Refer to 11-5. "Check row within 30 seconds after outdoor of outdoor fan motor". fan start-up. Refer to 11-5. "Check of inverter P.C. board". Nonvolatile memory data cannot be read properly. Power module 6-time flash 2.5 seconds OFF • Replace the inverter P.C. board. DC voltage 8-time flash 2.5 seconds OFF Each phase current of compressor 9-time flash 2.5 seconds OFF The interface short circuit occurs in the • Refer to 11-5. "How output of the intelligent power module to check inverter/ (IC700). compressor". The compressor winding shorts circuit. Temperature of discharge temperature • Refer to 11-5. "Check thermistor has been 50°C or less for of LEV". 20 minutes. • Check refrigerant circuit and refrigerant amount. DC voltage of inverter cannot be • Refer to 11-5. "How detected normally. to check inverter/ compressor". Each phase current of compressor cannot be detected normally. Stop valve (Closed valve) 14-time flash 2.5 seconds OFF Closed valve is detected by compressor current. U7 UE Large current flows into intelligent power module. 5-time flash 2.5 seconds OFF Discharge temperature UH Thermistor shorts or opens during compressor running. Nonvolatile memory data U6 UJ Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started. — • Check stop valve NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.). OCH530 Indoor/outdoor Outdoor unit unit failure failure mode mode recall recall function function — Discharge temperature UB SUZ-KA50VA3.TH 24 SUZ-KA60VA3.TH Check code (Wired remote controller) — SUZ-KA71VA3.TH Abnormal point (Failure mode / protection) None (Normal) LED indication (Outdoor P.C. board) — Outdoor power system UP U3 U4 — Discharge temperature thermistor Defrost thermistor 1-time flash every 2.5 seconds Fin temperature thermistor 3-time flash 2.5 seconds OFF P.C. board temperature thermistor 4-time flash 2.5 seconds OFF Ambient temperature thermistor 2-time flash 2.5 seconds OFF Outdoor heat exchanger temperature thermistor Overcurrent Condition — Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started. Thermistor shorts or opens during compressor running. 12-time flash 2.5 seconds OFF Fin temperature U5 Power module 7-time flash 2.5 seconds OFF 5-time flash 2.5 seconds OFF 6-time flash 2.5 seconds OFF Discharge temperature U7 UJ UH — DC voltage 8-time flash 2.5 seconds OFF Each phase current of compressor 9-time flash 2.5 seconds OFF Overcurrent Compressor open-phase 10-time flash 2.5 seconds OFF UO Stop valve (Closed valve) UE ○ Large current flows into intelligent power module. • Reconnect compressor connector. • Refer to 11-5. a"How to check inverter/ compressor". • Check stop valve. — ○ Waveform of compressor current is distorted. • Reconnect compressor connector. • Refer to 11-5. a"How to check inverter/ compressor". — ○ — ○ — ○ — ○ — ○ ○ ○ — ○ — ○ — ○ ○ ○ — — U6 ○ • Check refrigerant circuit and refrigerant amount. • Check stop valve. Outdoor fan motor Nonvolatile memory data ○ Temperature of indoor coil thermistor exceeds 70°C in HEAT mode. Temperature of outdoor heat exchanger temperature thermistor exceeds 70°C in COOL mode. P.C. board temperature FC ○ — UB U8 — • Check refrigerant circuit and refrigerant amount. • Refer to 11-5. k"Check of LEV". High pressure UD — • Reconnect connectors. • Refer to 11-5. a"How to check inverter/ compressor". • Check stop valve. • Refer to 11-5. g"Check of outdoor thermistors". Defective outdoor thermistors can be identified by checking the blinking pattern of LED. Temperature of discharge temperature thermistor exceeds 116°C, compressor stops. Compressor can restart if discharge temperature thermistor reads 100°C or less 3 minutes later. Discharge temperature U2 — 14-time flash 2.5 seconds OFF Temperature of fin temperature thermistor on the inverter P.C. board exceeds 75 - 80°C • Check around outdoor unit. • Check outdoor unit air passage. Temperature of P.C. board • Refer to 11-5.i"Check temperature thermistor on the inverter of outdoor fan motor". P.C. board exceeds 70 - 75°C. Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up. • Refer to 11-5.i"Check of outdoor fan motor". Refer to 11-5.l"Check of inverter P.C. board". • Replace the inverter P.C. board. • Refer to 11-5. a"How to check inverter/ compressor". Nonvolatile memory data cannot be read properly. The interphase short circuit occurs in the output of the intelligent power module (IPM). The compressor winding shorts circuit. Temperature of discharge temperature • Refer to 11-5. thermistor has been 50°C or less for k"Check of LEV". 20 minutes. • Check refrigerant circuit and refrigerant amount. DC voltage of inverter cannot be • Refer to 11-5. a"How detected normally. to check inverter/ compressor". Each phase current of compressor cannot be detected normally. Large current flows into intelligent • Reconnect power module (IPM). compressor connector. The open-phase operation of • Refer to 11-5. a"How compressor is detected. to check inverter/ The interphase short circuit occurs compressor". in the output of the intelligent power module (IPM). The compressor winding shorts circuit. Closed valve is detected by compressor current. • Check stop valve NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.). OCH530 Indoor/outdoor Outdoor unit unit failure failure mode mode recall recall function function — 11-time flash 2.5 seconds OFF UF Compressor synchronous abnormality (Compressor start-up failure protection) Remedy 25 11-3. TROUBLE SHOOTING CHECK TABLE SUZ-KA25VA3.TH SUZ-KA35VA3.TH SUZ-KA50VA3.TH No. 1 Symptom Outdoor unit does not operate. Abnormal point/ Condition 1-time flash every Outdoor power sys2.5 seconds tem LED indication 3 6-time flash 2.5 seconds OFF 11-time flash 2.5 seconds OFF 14-time flash 2.5 seconds OFF 5 6 7 8 Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started. Outdoor control sys- Nonvolatile memory data cannot be read properly. tem (The left lamp of OPERATION INDICATOR lamp of the indoor unit lights up or flashes 7-time.) Serial signal The communication fails between the indoor and outdoor unit for 3 minutes. Stop valve/ Closed valve is detected by compressor current. Closed valve Outdoor unit Outdoor unit is defective. (Other abnormality) Discharge temperature overheat protection Temperature of discharge temperature thermistor exceeds • Check refrigerant circuit and refrig116°C, compressor stops. Compressor can restart if discharge erant amount. temperature thermistor reads 100°C or less 3 minutes later. • Refer to 11-5. "Check of LEV". 4-time flash 2.5 seconds OFF Fin temperature /P.C. board temperature thermistor overheat protection High pressure protection Temperature of fin temperature thermistor on the heat sink exceeds 75 ~ 86°C or temperature of P.C. board temperature thermistor on the inverter P.C.board exceeds 72 ~ 85°C. 11 8-time flash 2.5 seconds OFF Compressor synThe waveform of compressor current is distorted. chronous abnormality 10-time flash 2.5 seconds OFF Outdoor fan motor 12 12-time flash 2.5 seconds OFF 13-time flash 2.5 seconds OFF 1-time flash 2.5 seconds OFF 3-time flash 2.5 seconds OFF Each phase current of compressor DC voltage 13 14 Outdoor unit operates. 16 Frequency drop by current protection Frequency drop by high pressure protection Frequency drop by defrosting in COOL mode 17 18 Outdoor unit operates. Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost thermistor exceeds 70°C in COOL mode. • Reconnect connector of compressor. • Refer to 11-5. "How to check inverter/compressor". • Check stop valve. • Check around outdoor unit. • Check outdoor unit air passage. • Refer to 11-5. "Check of outdoor fan motor". • Check refrigerant circuit and refrigerant amount. • Check stop valve. • Reconnect connector of compressor. • Refer to 11-5. "How to check inverter/compressor". Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up. • Refer to 11-5. "Check of outdoor fan motor. • Refer to 11-5. "Check of inverter P.C. board. Each phase current of compressor cannot be detected nor• Refer to 11-5. "How to check inmally. verter/compressor". DC voltage of inverter cannot be detected normally. • Refer to 11-5. "How to check inverter/compressor". When the input current exceeds approximately 7A(KA25)/ The unit is normal, but check the 8A(KA35)/9A(KA42)/12A(KA50), compressor frequency lowers. following. Temperature of indoor coil thermistor exceeds 55°C in HEAT • Check if indoor filters are clogged. • Check if refrigerant is short. mode, compressor frequency lowers. • Check if indoor/outdoor unit air circulation is short cycled. Indoor coil thermistor reads 8°C or less in COOL mode, compressor frequency lowers. Temperature of discharge temperature thermistor exceeds 111°C, compressor frequency lowers. • Check refrigerant circuit and refrigerant amount. • Refer to 11-5. "Check of LEV". • Refer to 11-5. "Check of outdoor thermistors". • Refer to 11-5. Check of outdoor thermistors. 4-time flash 2.5 seconds OFF Frequency drop by discharge temperature protection 5-time flash 2.5 seconds OFF Outside temperature When the outside temperature thermistor shorts or opens, thermistor protecprotective operation without that thermistor is performed. tion 7-time flash 2.5 seconds OFF Low discharge temperature protection Temperature of discharge temperature thermistor has been 50°C or less for 20 minutes. • Refer to 11-5. "Check of LEV". • Check refrigerant circuit and refrigerant amount. 8-time flash 2.5 seconds OFF PAM protection PAM: Pulse Amplitude Modulation The overcurrent flows into PFC (Power factor correction : IC820) or the bus-bar voltage reaches 394 V or more, PAM stops and restarts. 9-time flash 2.5 seconds OFF Inverter check mode The connector of compressor is disconnected, inverter check mode starts. This is not malfunction. PAM protection will be activated in the following cases: 1 Instantaneous power voltage drop. (Short time power failure) 2 When the power supply voltage is high. • Check if the connector of the compressor is correctly connected. Refer to 11-5. "How to check inverter/compressor". 20 NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-6-1. 2. LED is lighted during normal operation. Inverter P.C. board The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the flashing frequency is “2”. ON 2.5-second OFF OCH530 Flashing → 0.5-second ON 0.5-second ON OFF • Refer to 11-2-1. "Flow chart of the detailed outdoor unit failure mode recall function". Large current flows into intelligent power module. 5-time flash 2.5 seconds OFF 21 • Refer to 11-5. "How to check miswiring and serial signal error. • Check stop valve. Overcurrent protection 10 19 • Replace inverter P.C. board. 'Outdoor unit 2-time flash stops and 2.5 seconds OFF restarts 3 minutes later' is repeated. 3-time flash 2.5 seconds OFF 9 15 Remedy • Reconnect connector of compressor. • Refer to 11-5. "How to check inverter/compressor". • Check stop valve. Outdoor thermistors Discharge temperature thermistor, fin temperature thermistor, • Refer to 11-5. "Check of outdoor defrost thermistor, P.C. board temperature thermistor, outdoor thermistors". heat exchanger temperature thermistor or ambient temperature thermistor shorts or opens during compressor running. 2 4 Condition 2.5-second OFF 26 LED SUZ-KA60VA3.TH No. 1 Symptom Outdoor unit does not operate. Abnormal point/ Condition 1-time flash every Outdoor power 2.5 seconds system LED indication 2 3 6-time flash 2.5 seconds OFF 11-time flash 2.5 seconds OFF 14-time flash 2.5 seconds OFF 4 5 6 7 8 'Outdoor unit 2-time flash stops and 2.5 seconds OFF restarts 3 minutes later' is repeated. 3-time flash 2.5 seconds OFF 4-time flash 2.5 seconds OFF 9 SUZ-KA71VA3.TH Condition Overcurrent protection cut-out operates 3 consecutive times within 1 minute after the compressor gets started. Outdoor thermistors Discharge temperature thermistor, fin temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor, P.C. board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running. Outdoor control Nonvolatile memory data cannot be read properly. system (The upper lamp of OPERATION INDICATOR lamp of the indoor unit lights up or flashes 7-time.) Serial signal The communication fails between the indoor and outdoor unit for 3 minutes. Stop valve/ Closed valve is detected by compressor current. Closed valve Outdoor unit Outdoor unit is defective. (Other abnormality) Overcurrent protection Discharge temperature overheat protection Fin temperature /P.C. board temperature thermistor overheat protection High pressure protection Temperature of fin temperature thermistor on the heat sink exceeds 75 - 80°C or temperature of P.C. board temperature thermistor on the inverter P.C.board exceeds 70 - 75°C. 11 8-time flash 2.5 seconds OFF Compressor synchronous abnormality 10-time flash 2.5 seconds OFF Outdoor fan motor 12 Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start-up. 12-time flash 2.5 seconds OFF 13-time flash 2.5 seconds OFF 1-time flash 2.5 seconds OFF 3-time flash 2.5 seconds OFF Each phase current of compressor DC voltage Each phase current of compressor cannot be detected normally. DC voltage of inverter cannot be detected normally. Frequency drop by current protection Frequency drop by high pressure protection Current from power outlet is nearing breaker capacity. PFC module stops due to overcurrent. Temperature of indoor coil thermistor exceeds 55°C in HEAT mode, compressor frequency lowers. Frequency drop by defrosting in COOL mode Indoor coil thermistor reads 8°C or less in COOL mode, compressor frequency lowers. 4-time flash 2.5 seconds OFF Frequency drop by discharge temperature protection Temperature of discharge temperature thermistor exceeds 111°C, compressor frequency lowers. 7-time flash 2.5 seconds OFF Low discharge temperature protection Temperature of discharge temperature thermistor has been 50°C or less for 20 minutes. 8-time flash 2.5 seconds OFF Zero cross detecting Zero cross signal for PAM control cannot be detected. circuit 9-time flash 2.5 seconds OFF Inverter check mode The connector of compressor is disconnected, inverter check mode starts. 15 Outdoor unit operates. 16 17 18 Outdoor unit operates. Temperature of indoor coil thermistor exceeds 70°C in HEAT mode. Temperature of outdoor heat exchanger temperature thermistor exceeds 70°C in COOL mode. The waveform of compressor current is distorted. 19 20 • Replace inverter P.C. board. • Refer to 11-5. m "How to check miswiring and serial signal error. • Check stop valve. • Refer to 11-2.1. "Flow chart of the detailed outdoor unit failure mode recall function". • Reconnect connector of compressor. • Refer to 11-5. a "How to check inverter/compressor". • Check stop valve. Temperature of discharge temperature thermistor exceeds • Check refrigerant circuit and 116°C, compressor stops. Compressor can restart if discharge refrigerant amount. temperature thermistor reads 100°C or less 3 minutes later. • Refer to 11-5. k "Check of LEV". 5-time flash 2.5 seconds OFF 14 • Reconnect connector of compressor. • Refer to 11-5. a "How to check inverter/compressor". • Check stop valve. • Refer to 11-5. g "Check of outdoor thermistors". Large current flows into intelligent power module. 10 13 Remedy NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-6-3. 2. LED is lighted during normal operation. • Check refrigerant circuit and refrigerant amount. • Refer to 11-5. k "Check of LEV". • Refer to 11-5. g "Check of outdoor thermistors". • Refer to 11-5. k "Check of LEV". • Check refrigerant circuit and refrigerant amount. This is not malfunction. PAM protection will be activated in the following cases: 1 Instantaneous power voltage drop. (Short time power failure) 2 When the power supply voltage is high. • Check if the connector of the compressor is correctly connected. Refer to 11-5. a "How to check inverter/compressor". Inverter P.C. board The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the flashing frequency is “2”. 0.5-second ON 0.5-second ON • Check around outdoor unit. • Check outdoor unit air passage. • Refer to 11-5. i "Check of outdoor fan motor". • Check refrigerant circuit and refrigerant amount. • Check stop valve. • Reconnect connector of compressor. • Refer to 11-5. a "How to check inverter/compressor". • Refer to 11-5. i "Check of outdoor fan motor. • Refer to 11-5. l "Check of inverter P.C. board. • Refer to 11-5. a "How to check inverter/compressor". • Refer to 11-5. a "How to check inverter/compressor". The unit is normal, but check the following. • Check if indoor filters are clogged. • Check if refrigerant is short. • Check if indoor/outdoor unit air circulation is short cycled. Flashing → LED ON OFF 2.5-second OFF OCH530 2.5-second OFF 27 11-4. TROUBLE CRITERION OF MAIN PARTS (1) SUZ-KA25VA3.TH SUZ-KA35VA3.TH Part name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature thermistor (RT64) Measure the resistance using a tester. Ambient temperature thermistor (RT65) Refer to 11-6. “Test point diagram and voltage”, 11-6-1. “Inverter P.C. board”, for the chart of thermistor. Outdoor heat exchanger temperature thermistor(RT68) Discharge temperature thermistor (RT62) Measure the resistance using a tester. Before measurement, hold the thermistor with your hands to warm it up. Refer to 11-6. “Test point diagram and voltage”, 11-6-1. “Inverter P.C. board”, for the chart of thermistor. Measure the resistance between terminals using a tester. (Temperature : -20°C ~ 40°C) Normal Compressor U-V U-W V-W SUZ-KA25VA3.TH SUZ-KA35VA3.TH 1.36 ~ 1.93 1.52 ~ 2.17 Measure the resistance between terminals using a tester. (Temperature : -20°C ~ 40°C) Outdoor fan motor Normal Color of the lead wire WHT - BLK BLK - RED RED - WHT WHT RED BLK W V WHT U RED BLK W 29 ~ 42 V U Measure the resistance between terminals using a tester. (Temperature : -20°C ~ 40°C) R.V. coil (21S4) Normal 1.19 k ~ 1.78 k Measure the resistance using a tester. (Temperature : -20°C ~ 40°C) OCH530 WHT 28 BLU 37 ~ 54 LEV RED ORN YLW Normal BRN Expansion valve coil (LEV) Color of the lead wire WHT - RED RED - ORN YLW - BRN BRN - BLU 11-4. TROUBLE CRITERION OF MAIN PARTS (2) SUZ-KA50VA3.TH SUZ-KA60VA3.TH SUZ-KA71VA3.TH Part name Check method and criterion Defrost thermistor (RT61) Fin temperature thermistor (RT64) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Measure the resistance using a tester. Discharge temperature thermistor (RT62) Measure the resistance using a tester. Before measurement, hold the thermistor with your hands to warm it up. Figure Refer to 11-6. “Test point diagram and voltage”, 11-6-4. “Outdoor electronic control P.C. board” or 11-6-2, 11-6-3. “Inverter P.C. board”, for the chart of thermistor. Refer to 11-6. “Test point diagram and voltage”, 11-6-4. “Outdoor electronic control P.C. board” or 11-6-2, 11-6-3. “Inverter P.C. board”, for the chart of thermistor. Measure the resistance between terminals using a tester. (Temperature : -10°C ~ 40°C) WHT RED BLK Normal Compressor W SUZ-KA50/60VA3.TH SUZ-KA71VA3.TH 0.78 ~ 1.11 0.92 ~ 1.12 V U Measure the resistance between lead wires using a tester. (Temperature : -10°C ~ 40°C) Outdoor fan motor Color of the lead wire Normal SUZ-KA50/60/71VA3.TH RED - BLK BLK - WHT WHT - RED 12 ~ 17 WHT RED BLK W V U Measure the resistance using a tester. (Temperature : -10°C ~ 40°C) R.V. coil (21S4) Expansion valve coil (LEV) Normal SUZ-KA50/60/71VA3.TH 1.19 k ~ 1.78 k Measure the resistance using a tester. (Temperature : -10°C ~ 40°C) SUZ-KA50/60VA3.TH Normal Color of the lead wire WHT - RED RED - ORN 37 ~ 54 YLW - BRN BRN - BLU SUZ-KA71VA3.TH Color of the lead wire RED - ORN RED - WHT RED - BLU RED - YLW OCH530 Normal 37 ~ 54 WHT LEV RED ORN YLW BRN BLU WHT LEV ORN RED YLW 29 BLU [SUZ-KA25/35/50VA3.TH] 11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between compressor and the intelligent power module (IC700). See 11-5. B “Check of open phase”. Check the voltage between terminals. Are the voltages balanced? Yes No Replace the inverter P.C. board. See 11-5. C “Check of compressor”. Check the compressor. B Check of open phase With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals. Output voltage is 50 - 130V. (The voltage may differ according to the tester.) << Operation method (Test run operation)>> 1. Press the EMERGENCY OPERATION switch or the Test button to COOL or HEAT mode. 2. Test run operation starts and continues to operate for 30 minutes. 3. Compressor starts at rated frequency in COOL mode or 58Hz in HEAT mode. 4. Indoor fan operates at High speed. 5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts. 6. To cancel test run operation (EMERGENCY OPERATION), press the EMERGENCY OPERATION switch or the ON/OFF button on remote controller. <<Measurement point>> At 3 points BLK (U) - WHT (V) BLK (U) - RED (W) WHT (V) - RED (W) * Measure AC voltage between the lead wires at 3 points. NOTE: 1. Output voltage varies according to power supply voltage. 2. Measure the voltage by analog type tester. 3. During this check, LED of the inverter P.C. board flashes 9 times. (Refer to 11-6-1.) C Check of compressor Refer to 11-5. D “Check of compressor winding”. Is the compressor normal? Yes Refer to 11-5. E “Check of compressor operation time”. Does the compressor operate continuously? Yes No No Replace the compressor. Refer to 11-5. F"Check of compressor start failure". OK OCH530 30 [SUZ-KA25/35/50VA3.TH] D Check of compressor winding Disconnect the connector between the compressor and intelligent power module, and measure the resistance between the compressor terminals. <<Measurement point>> at 3 points BLK-WHT * Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <<Judgement>> Refer to 11-4. 0 [Ω] ················Abnormal [short] Infinite [Ω] ·······Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement. <<Judgement>> E Check of compressor operation time Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to over current. <<Operation method>> Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION : Refer to 11-5 B.) <<Measurement>> Measure the time from the start of compressor to the stop of compressor due to overcurrent. 0 second Compressor starts 1 second Abnormal (IPM failure) (Compressor winding short) 2 seconds Abnormal (Compressor lock out) (Starting defect) 10 seconds Abnormal (Poor contact,) (Outdoor P.C. board defect) (Disconnected connector) Abnormal (Refrigerant circuit defect) (Closed valve) 10 minutes Normal F Check of compressor start failure Confirm that 1~4 is normal. • Electrical circuit check 1 Contact of the compressor connector 2 Output voltage of inverter P.C. board and balance of them (See 11-5.B) 3 Direct current voltage between DB61(+) and (-) on the inverter P.C. board 4 Voltage between outdoor terminal block S1-S2 Does the compressor run for 10 seconds or more after it starts? After the compressor is heated with a drier, does the compressor start? Yes No Yes Compressor start failure. Activate pre-heat control. (Refer to 10-2. "PRE-HEAT CONTROL SETTING") Check the refrigerant circuit. Check the stop valve. Replace the compressor. *1 Heat the compressor with a drier for about 20 minutes. Do not recover refrigerant gas while heating. Heating part OCH530 31 [SUZ-KA25/35/50VA3.TH] G Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor. Is the resistance of thermistor normal? (Refer to 11-6-1.) Yes Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board. No Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch. Does the unit operate for 10 minutes or more without showing thermistor abnormality? Yes No Replace the inverter P.C. board. OK. (Cause is poor contact.) Thermistor Defrost Discharge temperature Fin temperature Ambient temperature Outdoor heat exchanger temperature Symbol RT61 RT62 RT64 RT65 RT68 Connector, Pin No. Between CN641 pin1 and pin2 Between CN641 pin3 and pin4 Between CN642 pin1 and pin2 Between CN643 pin1 and pin2 Between CN644 pin1 and pin3 Board Inverter P.C. board H Check of R.V. coil First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4. In case CN721 is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector although any signal is not being transmitted to R.V. coil. Check if CN721 is connected. Unit operates COOL mode even if it is set to HEAT mode. Disconnect connector between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode). Is there 230 VAC between CN721 and on the inverter P.C. board 3 minutes after the power supply is turned ON? No Replace the inverter P.C. board. Yes Replace the 4-way valve. Unit operates HEAT mode even if it is set to COOL mode. Disconnect connector between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode). Is there 230 VAC between CN721 and on the inverter P.C. board 3 minutes after the power supply is turned ON? No Replace the 4-way valve. OCH530 32 Replace the inverter Yes P.C. board. [SUZ-KA25/35/50VA3.TH] I Check of outdoor fan motor Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each terminal of outdoor fan motor normal? (Refer to 11-4.) No Yes Disconnect CN932 from outdoor electronic control P.C. board or the inverter P.C. board, and turn on the power supply. Rotate the outdoor fan motor manually and measure the voltage of CN931. Between 1(+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-) (Fixed to either 5 or 0 VDC) No No Replace the outdoor fan motor. Does the voltage between each terminal become 5 and 0 VDC repeatedly? Yes Does the outdoor fan motor rotate smoothly? Yes Replace the outdoor electronic control P.C. board or the inverter P.C. board. 260 - 370 VDC J Check of power supply DB61 Disconnect the connector between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch. Does the left lamp of OPERATION INDICATOR lamp on the indoor unit light up? Yes Is there voltage 260 - 370 VDC between DB61 (+) and DB61 (–) on the inverter P.C. board? (Refer to 11-6-1.) No Check the electric parts in main circuit. OCH530 Rectify indoor/outdoor connecting wire. No Yes Yes Is there voltage 230 VAC between the indoor terminal block S1 and S2? Does LED on the inverter P.C. board light up or flash? (Refer to 11-6-1.) Yes If lights up, OK. If flashes, refer to 11-3. 33 Inverter P.C. board (Solder side) No No Replace the indoor electronic control P.C. board. Replace the inverter P.C. board. [SUZ-KA25/35/50VA3.TH] K Check of LEV (For wireless remote controller use model) Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds. ON/O FF TO O WA RM TO O CO OL CT FAN COOL AUTO DRY HEAT SELE TIME VANE E MOD T RESE Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1 h ON/OFF TOO WARM TOO COOL Expansion valve operates in full-opening direction. Do you hear the expansion valve "click, click·······"? Do you feel the expansion valve vibrate on touching it ? No Is LEV coil properly fixed to the expansion valve? No Yes Does the resistance of LEV coil have the characteristics? Yes (Refer to 11-4.) No Replace the LEV coil. *1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received. Yes OK Properly fix the LEV coil to the expansion valve. Measure each voltage between connector pins of CN724 on the inverter P.C. board. 1. Pin (-) — Pin (+) 2. Pin (-) — Pin (+) 3. Pin (-) — Pin (+) 4. Pin (-) — Pin (+) Is there about 3 ~ 5 VAC between each? NOTE: Measure the voltage by an analog tester. Yes Replace the expansion valve. NOTE : After check of LEV, do the undermentioned operations. 1. Turn OFF the power supply and turn ON it again. 2. Press RESET button on the remote controller. OCH530 34 No Replace the inverter P.C. board. [SUZ-KA25/35/50VA3.TH] K Check of LEV (For wired remote controller use model) Start Turn on power supply to the outdoor unit after checking LEV coil is fixed to the LEV body securely. Yes Normal Is "click - click" sound heard? Or, do you feel vibration of the LEV coil with a hand? No Disconnect the connector CN724 is there normal resistance to LEV coil? Yes Replace the inverter P.C. board. No Replace the LEV coil. L Check of inverter P.C. board Check the outdoor fan motor. (Refer to H.) Is the fuse (F901) blown on the inverter P.C. board? Yes No Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION. Check the LED indication on the inverter P.C. board. Does the LED flash 10 times? Yes (10-time flash) No Check the corresponding parts following LED indication. (Refer to 11-3.) Replace the inverter P.C. board. OCH530 35 [SUZ-KA25/35/50VA3.TH] M How to check miswiring and serial signal error (For wireless remote controller use model) Turn OFF the power supply. Is there rated voltage in the power supply? Yes Check the power supply. No Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Yes No Check the wiring. Press EMERGENCY OPERATION switch once. Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit> Yes No Is serial signal error indicated 6 minutes later? Yes Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire? No Yes Correct them. No A As for indoor unit. Turn OFF the power supply. Check once more if the indoor/outdoor B connecting wire is not miswiring. Short-circuit outdoor terminal block S2 and S3. *1 *1. Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts. *3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes. Turn ON the power supply. Does the LED on the inverter P.C. board or the outdoor electronic control P.C. board repeat "3.6-second-OFF and 0.8-secondON quick blinking"? *3 Yes A • Turn OFF inverter-controlled lighting equipment. • Turn OFF the power supply and then turn ON again. • Press EMERGENCY OPERATION switch. Is serial signal error indicated 6 minutes later? Yes B • Reinstall either the unit or the light away from each other. • Attach a filter No on remote control receiving section of the indoor unit. OCH530 Turn OFF the power supply. Remove the short-circuit between outdoor terminal block S2 and S3. Turn ON the power supply. Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3? <Confirmation of serial signal> Yes Is there rated voltage between indoor terminal block S1 and S2? <Confirmation of power voltage> Yes No (Lighted or not lighted) Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, Yes intermediate connection, poor contact to the terminal block? No No No Replace the inverter P.C. board or the outdoor electronic control P.C. board. *2 *2. Be careful of the residual voltage of smoothing capacitor. Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, Yes intermediate connection, poor contact to the terminal block? No Replace the indoor electronic control P.C. board. Be sure to release the failure-mode recall function after checking. 36 Replace the indoor/ outdoor connecting wire. Replace the indoor/ outdoor connecting wire. [SUZ-KA25/35/50VA3.TH] M How to check miswiring and serial signal error (For wired remote controller use model) Turn OFF the power supply. Is there rated voltage in the power supply? Yes Check the power supply. No Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Yes No Check the wiring. Press TEST button once. Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit> Yes No Is serial signal error indicated 6 minutes later? Yes Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire? No Yes Correct them. No A As for indoor unit. Turn OFF the power supply. Check once more if the indoor/outdoor B connecting wire is not miswiring. Short-circuit outdoor terminal block S2 and S3. *1 *1. Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts. *3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board or the outdoor electronic control P.C. board is normal, LED blinks 6 times after 3 minutes. Turn ON the power supply. Does the LED on the inverter P.C. board or the outdoor electronic control P.C. board repeat "3.6-second-OFF and 0.8-secondON quick blinking"? *3 Yes A • Turn OFF inverter-controlled lighting equipment. • Turn OFF the power supply and then turn ON again. • Press EMERGENCY OPERATION switch. Is serial signal error indicated 6 minutes later? Yes B OCH530 • Reinstall either the unit or the light away from each other . • Attach a filter No on remote control receiving section of the indoor unit. Turn OFF the power supply. Remove the short-circuit between outdoor terminal block S2 and S3. Turn ON the power supply. Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3? <Confirmation of serial signal> Yes Is there rated voltage between indoor terminal block S1 and S2? <Confirmation of power voltage> Yes No (Lighted or not lighted) Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, Yes intermediate connection, poor contact to the terminal block? No No No Replace the inverter P.C. board or the outdoor electronic control P.C. board. *2 *2. Be careful of the residual voltage of smoothing capacitor. Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, Yes intermediate connection, poor contact to the terminal block? No Replace the indoor electronic control P.C. board. Be sure to release the failure-mode recall function after checking. 37 Replace the indoor/ outdoor connecting wire. Replace the indoor/ outdoor connecting wire. [SUZ-KA25/35/50VA3.TH] N Electromagnetic noise enters into TV sets or radios Is the unit earthed? Yes Is the distance between the antennas and the indoor unit within 3 m, or is the distance between the antennas and the outdoor unit within 3 m? No Earth the unit. No Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. Is the distance between the TV sets or radios and the indoor unit within 1 m, or is the distance between the TV sets or radios and the outdoor unit within 3 m? No Yes Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit. Are the antennas damaged? Is the coaxial cable damaged? Is there any poor contact in the antenna wiring? No Yes Replace or repair the antenna. Replace or repair the coaxial cable. Yes Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas. Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas close? No Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific conditions such as antennas or wiring). Check the following before asking for service. 1. Devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave) 2. Channel, frequency, broadcast station affected by the electromagnetic noise 3. Channel, frequency, broadcast station unaffected by the electromagnetic noise 4. Layout of ; indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, earth wire, antennas, wiring from antennas, receiver 5. Electric field intensity of the broadcast station affected by the electromagnetic noise 6. Presence or absence of amplifier such as booster 7. Operation condition of air conditioner when the electromagnetic noise enters in 1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise. 2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise. 3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise. 4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise. OCH530 38 [SUZ-KA60/71VA3.TH] a How to check inverter/compressor Disconnect the connector between compressor and the intelligent power module (IPM). See 11-5. b “Check of open phase”. Check the voltage between terminals. Are the voltages balanced? Yes No Replace the inverter P.C. board. See 11-5. c “Check of compressor”. Check the compressor. b Check of open phase ● With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if the inverter is normal by measuring the balance of voltage between the terminals. Output voltage is 50 - 130 V. (The voltage may differ according to the tester.) << Operation method(Test run operation)>> 1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice). 2. Test run operation starts and continues to operate for 30 minutes. 3. Compressor operates at rated frequency in COOL mode or 74 Hz in HEAT mode. 4. Indoor fan operates at High speed. 5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (operation frequency of compressor varies). 6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on remote controller. <<Measurement point>> At 3 points * Measure AC voltage between the lead wires at 3 points. BLK (U)-WHT (V) BLK (U)-RED (W) WHT(V)-RED (W) NOTE: 1. Output voltage varies according to power supply voltage. 2. Measure the voltage by analog type tester. 3. During this check, LED of the inverter P.C. board flashes 9 times. (Refer to 11-6-3.) c Check of compressor Refer to 11-5. d“Check of compressor winding”. Is the compressor normal? Yes Refer to 11-5. e“Check of compressor operation time”. Does the compressor operate continuously? Yes No No Replace the compressor. Refer to 11-5. f“Check of compressor start failure”. OK. OCH530 39 [SUZ-KA60/71VA3.TH] d Check of compressor winding ●Disconnect the connector between the compressor and intelligent power module, and measure the resistance between the compressor terminals. <<Measurement point>> at 3 points BLK-WHT * Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <<Judgement>> Refer to 11-4. 0 [Ω] ················Abnormal [short] Infinite [Ω] ·······Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement. e Check of compressor operation time <<Judgement>> ● Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to over current. <<Operation method>> Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION: Refer to 11-5 b.) <<Measurement>> Measure the time from the start of compressor to the stop of compressor due to overcurrent. 0 second Compressor starts 1 second Abnormal (IPM failure) (Compressor winding short) 2 seconds Abnormal (Compressor lock out) (Starting defect) 10 seconds Abnormal (Poor contact,) (Outdoor P.C. board defect) (Disconnected connector) Abnormal (Refrigerant circuit defect) (Closed valve) 10 minutes Normal f Check of compressor start failure Confirm that ~ is normal. •Electrical circuit check . Contact of the compressor connector . Output voltage of inverter P.C. board and balance of them (See 11-5 b.) . Direct current voltage between JP715(+) and JP30(-) on the inverter P.C.board . Voltage between outdoor terminal block S1-S2 Does the compressor run for 10 seconds or more after it starts? Yes Check the refrigerant circuit. Check the stop valve. No After the compressor is heated with a drier, does the compressor start? 1 No Replace the compressor. Yes *1 Heat the compressor with a drier for about 20 minutes. Do not recover refrigerant gas while heating. Compressor start failure. Activate pre-heat control. Heating part OCH530 40 [SUZ-KA60/71VA3.TH] g Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor. Is the resistance of thermistor normal? (Refer to 11-6-3.) Yes No Replace the thermistor except RT64. When RT64 is abnormal, replace the inverter P.C. board. Reconnect the connector of thermistor. Turn ON the power supply and press EMERGENCY OPERATION switch. Does the unit operate for 10 minutes or more without showing thermistor abnormality? Yes No Replace the inverter P.C. board. OK. (Cause is poor contact.) Thermistor Symbol Connector, Pin No. Defrost RT61 Between CN671 pin1 and pin2 Discharge temperature RT62 Between CN671 pin3 and pin4 Fin temperature RT64 Between CN673 pin1 and pin2 Ambient temperature RT65 Between CN672 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6 Board Inverter P.C. board h Check of R.V. coil * First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4. * In case CN602 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V. coil. Check if CN602 is connected. Unit operates COOL mode even if it is set to HEAT mode. Disconnect connector between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch twice (HEAT mode). Is there 230 VAC between CN602 and on the inverter P.C. board 3 minutes after the power supply is turned ON? No Replace the inverter P.C. board. Yes Replace the 4-way valve. Unit operates HEAT mode even if it is set to COOL mode. Disconnect connector between the compressor and the intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch once (COOL mode). Is there 230 VAC between CN602 and on the inverter P.C. board 3 minutes after the power supply is turned ON? No Replace the 4-way valve. OCH530 41 Replace the inverter Yes P.C. board. [SUZ-KA60/71VA3.TH] i Check of outdoor fan motor Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each terminal of outdoor fan motor normal? (Refer to 11-4.) No Yes Disconnect CN932 from the inverter P.C. board, and turn on the power supply. Rotate the outdoor fan motor manually and measure the voltage of CN931. Between 1(+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-) (Fixed to either 5 or 0 VDC) No No Does the voltage between each terminal become 5 and 0 VDC repeatedly? Yes Does the outdoor fan motor rotate smoothly? Yes Replace the inverter P.C. board. Replace the outdoor fan motor. J Check of power supply Disconnect the connector between compressor and intelligent power module. Turn ON power supply and press EMERGENCY OPERATION switch. Does the upper lamp of OPERATION INDICATOR on the indoor unit light up? Yes Is there bus-bar voltage 325 - 370 VDC between JP715 (+) and JP30 (–) on the inverter P.C. board? (Refer to 11-6.3.) No Check the electric parts in main circuit. Rectify indoor/outdoor connecting wire. No Yes Yes Is there voltage 230 VAC between the indoor terminal block S1 and S2? Does LED on the inverter P.C. board light up or flash? (Refer to 11-6.3.) Yes No No Replace the indoor electronic control P.C. board. Replace the inverter P.C. board. If lights up, OK. If flashes, refer to 11-3. JP30 JP715 325 -370 VDC OCH530 42 [SUZ-KA60/71VA3.TH] k Check of LEV (For wireless remote controller use model) Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds. ON/O FF TO O WA RM TO O CO OL CT FAN COOL AUTO DRY HEAT VANE SELE TIME E MOD T RESE Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. *1 h ON/OFF TOO WARM TOO COOL Expansion valve operates in full-opening direction. *1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received. Do you hear the expansion valve "click, click·······"? Do you feel the expansion valve vibrate on touching it ? No Is LEV coil properly fixed to the expansion valve? No Yes Does the resistance of LEV coil have the characteristics? Yes (Refer to 11-4.) No Replace the LEV coil. Yes OK Properly fix the LEV coil to the expansion valve. Measure each voltage between connector pins of CN724 on the inverter P.C. board. 1. Pin (-) — Pin (+) 2. Pin (-) — Pin (+) 3. Pin (-) — Pin (+) 4. Pin (-) — Pin (+) Is there about 3 - 5 VAC between each? NOTE: Measure the voltage by an analog tester. Yes No Replace the inverter P.C. board. Replace the expansion valve. NOTE: After check of LEV, do the undermentioned operations. 1. Turn OFF the power supply and turn it ON again. 2. Press RESET button on the remote controller. k Check of LEV (For wired remote controller use model) Start Turn on power supply to the outdoor unit after checking LEV coil is fixed to the LEV body securely. Yes Normal Is "click - click" sound heard? Or, do you feel vibration of the LEV coil with a hand? No Disconnect the connector CN724 is there normal resistance to LEV coil? No Replace the LEV coil. OCH530 43 Yes Replace the inverter P.C. board. [SUZ-KA60/71VA3.TH] l Check of inverter P.C. board Check the outdoor fan motor. (Refer to 11-5.i.) Is the fuse (F901) blown on the inverter P.C. board? Yes No Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION. Check the LED indication on the inverter P.C. board. Does the LED flash 10 times? Yes (10-time flash) No Check the corresponding parts following LED indication. (Refer to 11-3.) Replace the inverter P.C. board. OCH530 44 [SUZ-KA60/71VA3.TH] m How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Yes Check the power supply. No Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Yes No Check the wiring. Press EMERGENCY OPERATION switch once. Does the upper lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit> Yes Is serial signal error indicated 6 minutes later? Yes A Turn OFF the power supply. Check once more if the indoor/outdoor B connecting wire is not miswiring. Short-circuit outdoor terminal block S2 and S3. *1 No No Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire? No Yes Correct them. *1. Miswiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts. *3. Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C. board is normal, LED blinks 6 times after 3 minutes. Turn ON the power supply. Is the bus-bar voltage of the inverter P.C. board normal? (Refer to "TEST POINT DIAGRAM AND VOLTAGE" of the outdoor unit.) No Yes Does the LED on the inverter P.C. board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3 Yes No (Lighted or not lighted) Turn OFF the power supply. Remove the short-circuit between outdoor terminal block S2 and S3. Replace the indoor electronic control P.C. board. A • Turn OFF inverter-controlled lighting equipment. • Turn OFF the power supply and then turn ON again. • Press EMERGENCY OPERATION switch. Is serial signal error indicated 6 minutes later? Yes B OCH530 • Reinstall either the unit or the light away from each other. • Attach a filter No on remote control receiving section of the indoor unit. 45 Replace the inverter P.C. board. 2 *2. Be careful of the residual voltage of smoothing capacitor. [SUZ-KA60/71VA3.TH] n Electromagnetic noise enters into TV sets or radios Is the unit earthed? Yes Is the distance between the antennas and the indoor unit within 3 m, or is the distance between the antennas and the outdoor unit within 3 m? No Earth the unit. No Yes Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. Is the distance between the TV sets or radios and the indoor unit within 1 m, or is the distance between the TV sets or radios and the outdoor unit within 3 m? No Yes Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit. Are the antennas damaged? Is the coaxial cable damaged? Is there any poor contact in the antenna wiring? No Yes Replace or repair the antenna. Replace or repair the coaxial cable. Yes Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas. Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas close? No Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific conditions such as antennas or wiring). Check the following before asking for service. 1. Devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave) 2. Channel, frequency, broadcast station affected by the electromagnetic noise 3. Channel, frequency, broadcast station unaffected by the electromagnetic noise 4. Layout of: indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, earth wire, antennas, wiring from antennas, receiver 5. Electric field intensity of the broadcast station affected by the electromagnetic noise 6. Presence or absence of amplifier such as booster 7. Operation condition of air conditioner when the electromagnetic noise enters in 1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise. 2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise. 3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise. 4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise. OCH530 46 11-6. TEST POINT DIAGRAM AND VOLTAGE 11-6-1. Inverter P.C. board SUZ-KA25VA3.TH Back side of unit SUZ-KA35VA3.TH DB61 260 - 370 VDC (-) (+) SUZ-KA50VA3.TH Smoothing Smoothing capacitor capacitor (C63) (C62) Smoothing capacitor (C61) R.V.coil (CN721) 230 VAC Fuse (F701) T3.15AL250V Fuse (F801) T3.15AL250V 230 VAC Heater connector (CN722) Fuse (F901) T3.15AL250V Output to drive outdoor fan motor (CN932) 230 VAC Output to drive compressor (LDU, LDV, LDW) 100 Jumper wire for changing defrost setting (JS) LEV connector (CN724) Outdoor heat exchanger temperature thermistor /RT68 (CN644) Discharge temperature thermistor/RT62 (CN641) Defrost thermistor /RT61(CN641) Ambient temperature thermistor/RT65 (CN643) Signal of outdoor fan motor (CN931) Front side of unit Fin temperature thermistor/RT64 (CN642) LED Defrost thermistor(RT61) Ambient temperature thermistor(RT65) Outdoor heat exchanger temperature thermistor(RT68) 200 80 160 Discharge temperature thermistor(RT62) 700 60 600 50 40 30 20 10 -10 0 10 20 30 Temperature( ) OCH530 40 140 Resistance(k ) 70 Resistance(k ) Resistance(k ) Fin temperature thermistor(RT64) 180 90 0 -20 Jumper wire for pre-heat control setting (JK) 500 400 300 120 100 80 60 200 40 100 20 0 0 10 20 30 40 50 60 70 80 Temperature( ) 47 90 100 110 120 0 0 10 20 30 40 50 60 70 80 Temperature( ) 11-6-2. Inverter P.C. board SUZ-KA60VA3.TH SUZ-KA71VA3.TH Fuse (F62) T2.0AL250V Fuse (F601) T3.15AL250V R.V. coil (CN602) 230VAC Jumper wire for changing defrost setting (JS) Jumper wire for pre-heat control setting (JK) Signal of outdoor fan motor (CN931) Defrost thermistor /RT61 (CN671) Discharge temperature thermistor/RT62 (CN671) Outdoor heat exchanger temperature thermistor /RT68 (CN671) Ambient temperature thermistor/RT65 (CN672) Fin temperature thermistor/RT64 (CN673) LED Output to drive outdoor fan motor (CN932) Fuse (F901) T3.15AL250V Fuse (F880) T3.15AL250V LEV connector (CN724) JP715 (+) 325 - 370 VDC 100 JP30 (-) Defrost thermistor(RT61) Ambient temperature thermistor(RT65) Outdoor heat exchanger temperature thermistor(RT68) 200 180 90 80 160 Discharge temperature thermistor(RT62) 60 600 50 40 30 20 10 0 -20 -10 0 10 20 30 Temperature( ) OCH530 40 140 Resistance(k ) 70 700 Resistance(k ) Resistance(k ) Fin temperature thermistor(RT64) 500 400 300 120 100 80 60 200 40 100 20 0 0 10 20 30 40 50 60 70 80 Temperature( ) 48 90 100 110 120 0 0 10 20 30 40 50 60 70 80 Temperature( ) 12 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not. Sleeve Locking lever SUZ-KA25VA3.TH OUTDOOR UNIT (2) The terminal with this connector has the locking mechanism. Slide the sleeve. Pull the terminal while pushing the locking lever. Hold the sleeve, and pull out the terminal slowly. Connector SUZ-KA35VA3.TH NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel. (2) Pull down the service panel and remove it. (3) Disconnect the power supply and indoor/outdoor connecting wire. (4) Remove the screws fixing the top panel. (5) Remove the top panel. (6) Remove the screws fixing the cabinet. (7) Remove the cabinet. (8) Remove the screws fixing the back panel. (9) Remove the back panel. Screws of the top panel Screws of the top panel Back panel Screws of the back panel Screws of the cabinet Photo 2 Screw of the cabinet Service panel Screw of the service panel Direction to remove Screws of the cabinet OCH530 49 Hooks OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN721 (R.V. coil) CN932 (Fan motor) CN641 (Defrost thermistor and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) CN724 (LEV) (3) Remove the compressor connector (CN61). (4) Remove the screws fixing the relay panel. (Photo 3) (5) Remove the inverter assembly. (Photo 4) (6) Remove the screw of the earth wire and screw of the T.B.support. (Photo 4) (7) Remove the relay panel from the inverter assembly. (8) Remove the inverter P.C. board from the relay panel. Screws of the relay panel Photo 4 (Inverter assembly) Inverter P.C. board Heat sink 3. Removing R.V. coil Screw of the T.B.support T.B.support (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (3) Remove the R.V. coil. (Photo 5) Relay panel 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor Photo 5 Screw of the earth wire R.V. coil (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN641 (Defrost thermistor and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) (3) Pull out the discharge temperature thermistor from its holder. (Photo 5) (4) Pull out the defrost thermistor from its holder. (Photo 6) (5) Pull out the outdoor heat exchanger temperature thermistor from its holder. (Photo 6) (6) Pull out the ambient temperature thermistor from its holder. Discharge temperature thermistor OCH530 50 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN932 (Fan motor) (3) Remove the propeller nut. (Photo 7) (4) Remove the propeller. (Photo 7) (5) Remove the screws fixing the fan motor. (Photo 7) (6) Remove the fan motor. Outdoor heat exchanger temperature thermistor 6. Removing the compressor and 4-way valve (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Remove the inverter assembly. (Refer to procedure 2.) (3) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm² (0 MPa). (4) Detach the welded part of the suction and the discharge pipe connected with compressor. (5) Remove the nuts of compressor legs. (6) Remove the compressor. (7) Detach the welded part of pipes connected with 4-way valve. (Photo 8) Defrost thermistor Photo 7 Propeller Screws of the outdoor fan motor Propeller nut Photo 8 Welded parts of 4-way valve OCH530 51 SUZ-KA50VA3.TH NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) (2) (3) (4) (5) (6) (7) Remove the screws of the service panel. Remove the screws of the top panel. Remove the screw of the valve cover. Remove the service panel. Remove the top panel. Remove the valve cover. Disconnect the power supply and indoor/outdoor connecting wire. (8) Remove the screws of the cabinet. (9) Remove the cabinet. (10) Remove the screws of the back panel. (11) Remove the back panel. Screws of the top panel Screws of the cabinet Screws of the cabinet Screws of the cabinet Photo 2 Screw of the back panel Screws of the top panel Screws of the cabinet Screws of the cabinet Screws of the service panel Screw of the valve cover OCH530 52 Screws of the back panel OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screw of the terminal (1) Remove the cabinet and panels. (Refer to procedure 1.) Screw of the heat sink block support and the (2) Disconnect the lead wire to the reactor and the following con- support and the separator back panel nectors: <Inverter P.C. board> CN721 (R.V. coil) CN931, CN932 (Fan motor) CN641 (Defrost thermistor and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) CN724 (LEV) (3) Remove the compressor connector. (4) Remove the screws fixing the heat sink support and the separator. (5) Remove the fixing screws of the terminal block support and the back panel. (6) Remove the inverter assembly. (7) Remove the screw of the earth wire, screw of the P.C. board cover and screws of the terminal block support. Photo 4 (8) Remove the heat sink support from the P.C. board support. (9) Remove the screw of the inverter P.C. board and the inverter Heat sink Heat sink P.C. board from the P.C. board support. support P.C. board support 3. Removing R.V. coil (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the following connector: <Inverter P.C. board> CN721 (R.V. coil) (3) Remove the R.V. coil. Screw of the P.C. board cover Screw of the inverter P.C. board Screw of the earth wire Screws of the terminal block support Photo 5 Screw of the R.V. coil Brazed parts of 4-way valve OCH530 53 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN641 (Defrost thermistor and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) (3) Pull out the discharge temperature thermistor from its holder. (4) Pull out the defrost thermistor from its holder. (5) Pull out the outdoor heat exchanger temperature thermistor from its holder. (6) Pull out the ambient temperature thermistor from its holder. Photo 6 Ambient temperature thermistor Outdoor heat exchanger temperature thermistor 5. Removing outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to procedure 1.) Defrost thermistor (2) Disconnect the following connectors: <Inverter P.C. board> CN931 and CN932 (Fan motor) (3) Remove the propeller nut. (4) Remove the propeller. (5) Remove the screws fixing the fan motor. (6) Remove the fan motor. Photo 7 Propeller nut 6. Removing the compressor and 4-way valve Screws of the outdoor fan motor Photo 8 (1) Remove the top panel, cabinet and service panel. (Refer to procedure 1.) (2) Remove the back panel. (Refer to procedure 1.) (3) Remove the inverter assembly. (Refer to procedure 2.) (4) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm² (0 MPa). (5) Detach the brazed part of the suction and the discharge pipe connected with compressor. (6) Remove the compressor nuts. (7) Remove the compressor. (8) Detach the brazed part of 4-way valve and pipe. (Photo 5) Brazed part of the discharge pipe Discharge temperature thermistor Brazed part of the suction pipe OCH530 54 SUZ-KA60VA3.TH SUZ-KA71VA3.TH NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) (2) (3) (4) (5) (6) (7) Remove the screws of the service panel. Remove the screws of the top panel. Remove the screw of the valve cover. Remove the service panel. Remove the top panel. Remove the valve cover. Disconnect the power supply and indoor/outdoor connecting wire. (8) Remove the screws of the cabinet. (9) Remove the cabinet. (10) Remove the screws of the back panel. (11) Remove the back panel. Screws of the top panel Screws of the cabinet Screws of the cabinet Photo 2 Screw of the back panel Screws of the top panel Screws of the cabinet Screws of the cabinet Screws of the service panel Screw of the valve cover OCH530 55 Screws of the back panel OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN602 (R.V. coil) CN931, CN932 (Fan motor) CN671 (Defrost thermistor, discharge temperature thermistor and outdoor heat exchanger temperature thermistor) CN672 (Ambient temperature thermistor) CN724 (LEV) (3) Remove the compressor connector. (4) Remove the screws fixing the relay panel. (5) Remove the relay panel. (6) Remove the earth wires and the lead wires of the inverter P.C. board. (7) Remove the screw of the PB support. (8) Remove the inverter P.C. board from the relay panel. Photo 3 Screw of the relay panel Inverter P.C board Earth wires Screws of the PB support Screws of the PB support Screws of the relay panel 3. Removing R.V. coil (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the following connector: <Inverter P.C. board> CN602 (R.V. coil) (3) Remove the R.V. coil. Photo 4 Screw of the R.V. coil Welded parts of 4-way valve OCH530 56 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, defrost thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to procedure 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C. board> CN671 (Defrost thermistor, discharge temperature thermistor and outdoor heart exchanger temperature thermistor) CN672 (Ambient temperature thermistor) (3) Pull out the discharge temperature thermistor from its holder. (Photo 7) (4) Pull out the defrost thermistor from its holder. (5) Pull out the outdoor heat exchanger temperature thermistor from its holder. (6) Pull out the ambient temperature thermistor from its holder. Photo 5 Outdoor heat exchanger temperature thermistor Ambient temperature thermistor 5. Removing outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931 and CN932 (Fan motor) Defrost thermistor Photo 6 (3) Remove the propeller. (4) Remove the screws fixing the fan motor. (5) Remove the fan motor. 6. Removing the compressor and 4-way valve Photo 7 (1) Remove the top panel, cabinet and service panel. (Refer to procedure 1.) (2) Remove the back panel. (Refer to procedure 1.) (3) Remove the inverter assembly. (Refer to procedure 2.) (4) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm² (0 MPa). (5) Detach the welded part of the suction and the discharge pipe connected with compressor. (6) Remove the compressor nuts. (7) Remove the compressor. (8) Detach the welded part of 4-way valve and pipe. (Photo 4) Screws of the outdoor fan motor Welded part of the discharge pipe Discharge temperature thermistor Welded part of the suction pipe OCH530 57 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Oct. 2012 No.OCH530 Made in Japan New publication, effective Oct. 2012 Specifications are subject to change without notice.
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