1. business and industrial
2. energy
3. electricity

SUBMITTAL
FORM NO. 2003-17P
MicroMetl
DATE: 2/12
Centrifugal Power Exhaust for Carrier
48/50TC A/B04-A/B07; 50TCQ A04-A07; 48/50LC,HC A04-A06;
50HCQ A04-A06; 48/50TF,TM,HJ,TFQ 004-007; 48/50HE 003-006 Units
(Down Discharge)
SUBMITTED TO
COMPANY:
Part Number:
1682-0103
4682-0103
5682-0103
Power Exhaust Specifications
DRAWN BY:
JOB NAME:
EQUIPMENT:
NOTES:
Power Exhaust
• The MicroMetl power exhaust includes the fully modulating slide-in
economizer and power exhaust module, shipped from the factory as
a completely assembled economizer and power exhaust hood.
• Blower motor includes automatic internal thermal protection.
• Blower motor includes adjustable pulley.
• Transformer, contactor, and relay are factory mounted in a
NEMA box.
• ETL Listed
• Blowers have prelubricated ball bearings
with rubber isolators and a dynamically
balanced wheel.
• Uses filter rack and filter access
door shipped with HVAC unit.
• Gear driven damper blades
for smooth operation.
• Modulating power exhaust
option available.
MicroMetl
Part Numbers
External
Static in wg.
(2)
1682-0103
208/230V
3PH
4682-0103
460V 3PH
5682-0103
575V 3PH
CFM Performance
0.1
0.2
0.25
0.3
Full
Load
Amps (1)
Motor
RPM
HP
1725
1/2
2.3/2.2
2375
2125
2000
1850
1.1
0.65
Weight: 225 lbs
Note:
(1) For proper wire sizing to the unit add unit full load amps and MicroMetl power exhaust full load amps.
(2) External static would be specific to each job and may include return air duct, dampers in return air and/or
return grilles.
CM
C
LISTED
®
CM
LISTED
Power exhaust potentiometer on logic must be
set to bring power exhaust on when outside
air is fully open and return air is fully closed.
End switch not used with modulating power
Drive gear
exhaust.
®
Access door
shipped with
HVAC unit
Economizer motor
and harness
attached to
the motor
Side View
Filters
Gear driven
dampers
23 13/16"
Evaporation
coil
Access doors to blower motor and controls
(opposite side)
Economizer includes Honeywell W7212
controller capable of CO2,
demand control and power
exhaust control.
Control
Access
Relief
damper
3 1/2"
THIS DOCUMENT IS THE PROPERTY OF MICROMETL CORPORATION AND IS DELIVERED UPON THE EXPRESS CONDITION THAT THE CONTENTS WILL NOT BE DISCLOSED OR USED WITHOUT MICROMETL'S WRITTEN CONSENT.
MMC INDIANAPOLIS • 3035 NORTH SHADELAND AVENUE, SUITE 300 • INDIANAPOLIS, IN. 46226 • 1-800-662-4822 •• MMC WEST • 905 SOUTHERN WAY • SPARKS, NV 89431 • 1-800-884-4662
ILL. #6A
(Side View)
ILL. #5
Filter access
door
Mount discharge
sensor here
Water entrainment
filter
Power exhaust
hood
ECONOMIZER WIRING INSTRUCTIONS
ILL. #6
Thermostat
Connection Board
1
2
Red
NOTE: There are (4) loose wires available in the HVAC unit. Connect the pink
and violet wires to the discharge sensor.
Do not use the brown and white wires
3
4
5
Plug harness installed
in HVAC units
Maintains mixed air temperature
between 50O-56O.
If using a fixed dry bulb, the
orange wire will house a 620
ohm resistor.
To compressor lockout
“2” on HVAC unit (if 2
stage is used)
Do
not use
Brw
Connect the pink and violet
wires to the discharge sensor. Do
not use brown or white wires
Compressor lockout switch on
some models. Lockouts out
compressors at 35O F (+/- 5O)
Field wire if desired.
Remove this jumper / resistor
when using differential enthalpy.
To compressor lockout
“1” on HVAC unit
MicroMetl discharge
sensor (mount in blower
compartment)
Pink
4
If using differential enthalpy,
setpoint should be at “D”.
Enthalpy or
adj. dry bulb
Actuator
Logic
Exhaust Fan Set Point
MicroMetl economizer
harness / plug
620 OHM
Resister
+
SR
Minimum Position
Setting
DCV / CO2 maximum
setpoint
Red
DCV / CO2 activation
setpoint
Power exhaust fan
connection
To optional
CO2 sensor
2
EF
EF1
AQ
AQ1
Black
N
24V
HOT
Enthalpy
changeover
setpoint
1
Power Exhaust Wiring
ILL. #8
POWER EXHAUST
WIRING INSTRUCTIONS
Disconnect box
8. Set the power exhaust in front of the economizer. Attach the two wire low voltage harness from the power exhaust to its mating plug in the economizer side flange. (ILL. 8A) Attach the high voltage cable from the power exhaust to its mating plug in the economizer. Route the high voltage cable to the HVAC unit controls. (ILL. 8)
Coil and filter rack
9. Install the power exhaust hood assembly over the
economizer. NOTE: The hood hooks over the top of the economizer (See Hood Latch Detail). Use #12 x 1” screws
to secure the power exhaust hood to the unit’s economizer posts and power exhaust supports.
10. Locate the exhaust setpoint potentiometer on the economizer controller logic. Adjust the potentiometer so that the exhaust fan is activated when the outside air dampers are completely open.
Wire path determined by
installer
1682 power
exhaust
11. Wire power exhaust per diagram on next page. Secure wires in place away from all moving parts.
12. First Calculate MCA New using the following formula:
Economizer
Installation
hook on the
hood
MCA New = MCA unit only + MCA of Power Exhaust
For example, using a 48HJD006 - 5 unit with MCA =
28.9 and
MOCP = 35, with CRPWREXH030A00 power exhaust.
MCA New = 28.9 amps + 1.6 amps = 30.5 amps.
Rain
Hood
13a. If MCA New < MOCP for the HVAC unit, you can tie the
power wire to the HVAC contactor terminal strip. See
Diagram 1, or follow 13b. If installed in unit, tap off terminal
block capable of handling more than 1 wire.
Hood Latch Detail
**Route power exhaust wire to protect from damage (from impact,
pull, sharp edges, hot surfaces, etc.)
13b. If MCA New > MOCP for the HVAC unit, you must run power wire for the power exhaust to an external disconnect. Make sure the disconnect is sized properly for the power from the power exhaust as well as the HVAC unit.
ILL. #8A
*Refer to Diagram 1 on Page 6 for more information.
13. If using modulating power exhaust option, refer to
modulating options page.
IMPORTANT NOTE:
Follow all local codes when wiring system.
CAUTION!
Outside air blades must be completely
open before exhaust fan is activated.
Adjust end switch accordingly.
CAUTION!
Exhaust fan can cause severe injury. Always disconnect power before servicing.
5
13a
13b
DIAGRAM 1
NOTES:
1. 575 V transformer No. HT01AH859 is ordered separately from power exhaust.
2. Economizer actuator and controller are shipped with the economizer - not with power exhaust.
3. Connections from End Switch plug to the economizer controller are made by installer.
4. If a single power source is to be used, size wire to include power exhaust MCA and MOCP.
Check MCA and MOCP When power exhaust is powered through the unit. Determine the new MCA including the power exhaust using
the following formula:
MCA New = MCA unit only + MCA of Power Exhaust
For example, using a 48HJD006 - 5 unit with MCA = 28.9 and MOCP = 35, with CRPWREXH030A00 power exhaust. MCA New = 28.9 amps + 1.6 amps = 30.5 amps. If the new MCA does not go over the MOCP published, then MOCP would not change. The MOCP in this example is 35 amps, the MCA New is below 35, therefore the MOCP is OK. If “MCA New” is larger than the published MOCP, raise the MOCP to the next larger size. For separate power, the MOCP for the power exhaust will be 15 amps per NEC.
6
Power Exhaust Wiring
ILL. #10
24-Volt Transformer Color Code
CONTROL BOX IN POWER EXHAUST
Common
Yellow Yellow
Yellow
Black
Power
Red - 208V
Orange - 230V
Black - 460V
Grey - 575V
NOTE:
1) Wire transformer according to
it’s wiring description and the
customer specifications.
2) Transformer, contactor and
fuses are to be mounted in a
NEMA type electrical box.
3) Use 14 AWG or larger
conductor for wiring.
4) Follow all local codes.
**Refer to
Diagram 1. Use
the formula on
page 6 and 7 to
determine
electrical
configuration.
**Wire color can be substituted
to Red, White, Black, and Green
between the motors and power
exhaust terminal block.
PLUG #2
Wiring Diagram For 102S-0100 Two Speed Power Exhaust Controller
Low
Speed
ELECTRICAL BOX
R1
Low speed
motor
1
LOW SPEED
7
Mounted on
economizer
actuator
BLUE
YELLOW
BLACK
BLUE
YELLOW
BLACK
BLUE
YELLOW
BLACK
Power
Red - 208V
Orange - 230V
Black - 460V
Grey - 575V
T5
T6
motor
COMMON
Common
Yellow Yellow
Yellow
Black
NOTE:
1) Wire transformer according to
it’s wiring description and the
customer specifications.
**Refer to Diagram 1. Use the
formula on page 6 and 7 to
2) Transformer, contactor and
determine electrical configuration
fuses are to be mounted in a
25 ft. SE0W/
NEMA type electrical box.
S0W Power
3) Use 14 AWG or larger
Cord
conductor for wiring.
High speed
4) Follow all local codes.
GROUND
ORANGE
BLUE
YELLOW
BLACK
POWER
GROUND
YELLOW
YELLOW
T4
24-Volt Transformer Color Code
A
B
R1
9
6
ORANGE
High
Speed
7
T1
T2
T3
Mounted on
economizer
actuator
**Wire color can be substituted
to Red, White, Black, and Green
between the motors and power
exhaust terminal block.
Modulating Blower Power Exhaust (Option)
Blower Modulation Installation Instructions (use this page only if the modulating exhaust option has been ordered)
The 1682/4682/5682-0103-M*930, and 4682/1682-0303-M*930 Power Exhaust contains a motor controller that varies the blower speed
in order to maintain an acceptable room pressure. The power exhaust is equipped with a pressure sensing transducer that compares
room pressure to atmospheric. This transducer sends a signal to the motor controller which varies the motor voltage in order to provide
pressure relief.
Installation Instructions:
1. Install 1/8” i.d. or 3/16” i.d. pressure tubing to the room pressure sensor located within the building space.
2. Power exhaust is factory set at these CFM at .25”:
1682/4682/5682-0103
1682/4682/5682-0203
1682/4682/5682-0303
Note: If the power exhaust will not
engage, check motor controller for
fault light. If fault light is on, reverse
phase sequence at the power cord
(not in the motor box)
2000 CFM
3000 CFM
4000 CFM
3. Place the HVAC unit in continuous operation mode.
4. In order to determine system operation conditions, adjust the economizer minimum position to 100% outside air. At this time measure
the room static pressure differential to insure that the space is balanced to an acceptable pressure difference (i.e. less than 0.05” w.g.). If the room pressure i above 0.05” w.g., increase the blower speed by adjusting the motor pulley.
5. Measure the power exhaust line amperage at the disconnect box. Compare the amperage to the table below to insure that the
motor will not overload during modulation.
6. The amp draw must not exceed the values listed below.
7. If the amperage is too high, the blower must be lowed down by adjusting the pulleys. Repeat steps 3 to 6. If the room pressure is
excessive at this point, call MicroMetl for further assistance.
**If installed in unit, tap off terminal block capable for handling more than 1 wire.
Factory installed tubing
to atmospheric
pressure port
ILL. #13
Factory installed tubing
to room pressure
sensor
25 ft of tubing
factory supplied
Factory installed
atmospheric pressure
port. Covered by hood
Transducer factory
installed
Return air duct.
Field supplied
Tubing for room
pressure field
installed
Maximum Amp Draw
Room pressure sensing port. Mount to
ceiling or wall. Co-axial cable cover
field provided.
8
HP
208 V
230 V
460 V 575 V
3-6 ton
1/2
2.3
2.2
1.1
.65
7 1/2-8 1/2 ton
1
3.3
3.4
1.7
1.1
10-12 1/2 ton
2
6.6
6.6
3.3
2.4
For Modulating Power Exhaust Only
TUNING THE PI CONTROL
Once the PI is set up correctly, it needs to be tuned in order
to maintain the process setpoint. First, set the Integral Gain
to zero, and increase the Proportional Gain (parameter 64)
until the system becomes unstable, then lower the gain until
the system stabilizes the system. If only Proportional Gain
is used, and the system is operating in a steady-state condition (setpoint is fixed and process variable has settled to a
fixed value), there will always be a certain about of error in
the system. This is called the steady-state error.
Integral Gain (Parameter 65) is used to force the steadystat error to zero by increasing the output speed command
with respect to time. Over time, the error will be forced to
zero because the Integral term will continue to change the
speed command , even after the Proportional term reaches
steady state and no longer affects the speed command.
The Integral Gain affects the rate of rise of the output speed
command from the Integral term. Small amounts of Integral
Gain can cause large changes in PI performance, so car
must be taken when adjusting Integral Gain. Too much Integral Gain will result in overshoots, especially if large step
changes in error occur.
The other parameter setting that affects the response of the
PI control is Parameter 66 - PI ACC. This sets the acceleration (and deceleration) rate of the setpoint reference into the
PI unit. When the setpoint changes, this function will “filter”
the input to the PI unit by ramping the setpoint reference
from the pervious value to the new value. This will help
prevent overshoots that can setpoint, resulting in smoother
operation. If PI ACC is set to 0.0 seconds, it is effectively
disabled.
Parameter 55 is also frequently used.
P55 displays the level of the 0-10 VDC analog input signal
(in percent) at TB-5.
9
Modulating Power Exhaust
Motor Connections
Low Voltage
HIGH 460 V
LOW 230 V
200-240 V
L1
L2
G
L3
High Voltage
**Wire color can be substituted to
Red, White, Black, and Green
between the motors and VFD.
HIGH 460 V
LOW 230 V
460 V
G
L1
L2
L3
575 V
**Refer to
Diagram 1. Use
the formula on
page 6 and 7 to
determine
electrical
configuration.
L1
L2
G
Power Exhaust Static Data
X denotes factory settings
10
L3
Power Exhaust Static Data
X denotes factory settings
X denotes factory settings
11