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Centrifugal Power Exhaust and Economizer for Horizontal
Application 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
MicroMetl
SUBMITTAL
DATE: 2/12
FORM NO. 2156-10P
Part Number:
1882-0102-54930
4882-0102-54930
5882-0102-54930
Power Exhaust Specifications
SUBMITTED TO
COMPANY:
DRAWN BY:
JOB NAME:
EQUIPMENT:
NOTES:
Carrier
Units
MicroMetl Part
Numbers
External Static in. wg
(2)
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
1882-0102-54930
208/230V-3PH
4882-0102-54930
460V-3PH
5882-0102-54930
575V-3PH
CFM Performance
0.1
0.2
0.25
0.3
Full Load
Amps (1)
Motor
RPM
HP
APPRX.
WT. LBS
1725
1/2
150
2.3/2.2
2130
1900
1790
1.1
1655
0.65
Power Exhaust
• Blower motor includes automatic internal thermal protection.
• Blower motor includes adjustable pulley.
• Transformer, contactor, and relay are factory mounted in electrical box, located on hinged front panel.
• Blowers have prelubricated ball bearings with rubber isolators and a dynamically balanced wheel.
• Package includes 0849 horizontal economizer, economizer enthalpy controls, and centrifugal power exhaust.
• Modulating power exhaust available.
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.
(3) These packages include the 0849 horizontal economizer and the power exhaust module.
Return air
damper on
Door for factory MicroMetl
installed control horizontal
economizer
box
Rooftop
HVAC unit
Filter access door
MicroMetl power
exhaust package
16.750"
25"
29
Field supplied
return duct
Economizer
rain hood
.68
8"
Top Application View
24.500"
26.500"
23.375"
14.750"
1.000"
TYP.
22.875"
Blower hood
requires field
provided support
Side View
"A"
Barometric backdraft damper
Economizer includes
Honeywell W7212
controller with CO2,
demand control and power
exhaust control.
Centrifugal exhaust fan
CM
LISTED
®
CM
C
LISTED
Package includes
Economizer and
Power Exhaust
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 N. SHADELAND AVENUE, SUITE 300 • INDIANAPOLIS, IN. 46226 • 1-800-662-4822 •• MMC WEST • 905 SOUTHERN WAY • SPARKS, NV 89431 • 1-800-884-4662
MicroMetl
Horizontal
Economizer Only
INSTALLATION INSTRUCTIONS
1882, 4882, 5882 - 0102, 0202, 0302
Horizontal Economizer and Power Exhaust
Top filter access door.
(shipped with HVAC unit)
ILL.#1
1) Disconnect power to HVAC unit.
Set
aside for use later. Remove and
discard the filter access door and
bottom panel shipped with HVAC unit.
Disc
ard
pan this
el
2) Unpack economizer.
3) Remove the discharge air sensor
from the economizer and install in the
supply air chamber next to the indoor
blower. (ILL. 6)
4) Turn economizer on end. Slide
economizer into return air chamber.
(ILL. 2) Be sure return damper is
oriented toward horizontal return
opening. Some units will require
slightly lifting top up.
HVAC unit's bottom panel.
Remove and discard.
ILL.#2
5) On 10-12 1/2 ton units and some 8 1/2
ton units only. Install horizontal blank off
(ILL. 3.) on top of horizontal return air
opening.
Rooftop Unit
Outside
Air Damper
6) Caulk the outside air hoods and
secure to panel. Install aluminum
filters in hoods.
7) Install hood/panel assembly over the
economizer.
NOTE: You must lift the unit top to
install this panel over the economizer.
Screw in place.
Filter
Door
ILL.#3
END VIEW
Horizontal Blank off
for 10-12 1/2 ton and
some 8 1/2 ton units
only
12 11/16""
3 3/4"
M M C 3035 N. Shadeland Avenue, Suite Indianapolis, IN. 46226 MMC West
Relief
Blades
202 S. 18TH ST.
Sparks, NV. 89431
Manufacturer reserves the right to discontinue, or change at any time, specifications, designs and prices without notice and without incurring obligations.
Form No. 2909-5P
Copyright MicroMetl Corporation 2003. All rights reserved.
7) On 7 1/2, 8 1/2 ton units remove
panel extender. (ILL. 5)
ILL.#4
8) Install the field supplied horizontal
return air duct over the opening
(ILL. #4) caulk and screw it in place.
Field supplied
return duct.
9) Connect the wiring per the enclosed
instructions and diagrams.
10) Test cycle the economizer. Motor
and logic access provided behind
filter access door.
Panel
extender
(10 & 12 1/2 ton
and some 8 1/2 ton
units only)
Panel extender
for 10, 12 1/2 and
some 8 1/2 ton
units only
(See note 10)
STEP #3
-
ILL.#5
Filter Door
Rainhood
with aluminum
filter
IMPORTANT ! - please read !
Use 1 of the next 2 pages to wire the economizer. To determine which page to use,
check economizer harness in HVAC unit and
compare to wiring instruction description at
top of each page. Cycle test and adjust.
ILL.#6
Side View
Mount discharge
sensor here
Plug-in economizer
harness
Indoor blower
HVAC unit filter
2
Wiring Instruction for Use whth 12 Pin Plug Enthalpy and Adjustable Dry Bulb
terminal board
PLEASE READ CAREFULLY !
Follow these instructions if the economizer wiring harness in the HVAC unit
has a 12 pin plug.
9962-0142 Wiring Harness
with 12 pin plug
Factory installed
harness...
ILL. #11
factory attached
to terminal board
Control
compartment
IMPORTANT !
Economizer
and hood
CONTROL SYSTEM NOTES:
1. The HVAC unit has an economizer wiring harness factory installed. It attaches to the 9962-0142 economizer harness on one end and is factory
attached to the unit's terminal board on the other end (ILL. #11).
2. The 9962-0047 pigtail and the 9962-0073 adaptor harness are available from factory for obsolete units with 9 pin plug.
9962-0142 Wiring Harness
WIRING INSTRUCTIONS for use with 12 pin economizer plug.
STEP #4
ILL. #12
• Plug the economizer's 9962-0142 wiring
harness into the HVAC unit's harness.
1
If using differential enthalpy,
setpoint should be at "D".
2
Compressor lockout switch on
some models. Lockouts out
compressors at 35°F (+/- 5°).
STEP #5
• Mount the MicroMetl discharge sensor
in the unit blower compartment.
(see ILL. 6)
Remove this jumper / resistor
3 when using differential enthalpy.
NOTE: There are (4) loose wires
available in the HVAC unit. Connect
the pink and voilet wires to the
discharge sensor. Do not use the
brown and white wires.
MicroMetl discharge
sensor (mount in blower
compartment)
Connect the pink and voilet
wires to the discharge
sensor. Do not use brown
or white wires.
To compressor
lockout "1" on
HVAC unit
To compressor
lockout "2" on
HVAC unit
(if 2 stage is
used).
Pink
4
Maintains mixed air temperature
4 between 50° - 56°.
Plug harness
installed in
HVAC unit.
Exhaust Fan
Set Point
MicroMetl
economizer
harness / plug
Minimum Position
Setting
3
DCV / CO2
maximum setpoint
DCV / CO2 activation
setpoint
Power exhaust
fan connection
EF
EF1
AQ
To optional CO2
Sensor
Enthalpy 1
changeover
setpoint
AQ1
N
Black
24V
HOT
3
MicroMetl Integrated Economizers
The purpose of an economizer is to use outdoor air
for cooling , whenever possible, to reduce compressor operation.
The economizer system initially responds to a signal
from the cooling thermostat and functions as a true
first stage for cooling, while providing maximum fuel
economy. The economizer is automatically locked
out during the heating mode and holds the outdoor
air damper at the minimum position settings.
During the occupied period, on a call for cooling,
when outdoor air temperature or enthalpy conditions
are low, the economizer actuator will proportion to
maintain between 50º F and 56º F at thermistor
discharge sensor.
If the mixed or discharge temperature is above 56º F,
actuator will open to admit additional outdoor air until
the temperature returns to the 50º to 56º F range. If
the mixed or discharge air temperature is below
50º F, the actuator will proportion closed, shutting the
outdoor air damper until the temperature returns to
the 50º to 56º F range. During the occupied period,
the actuator will not close past the minimum
position.
4
If the fully open actuator cannot satisfy the space
demand, mechanical cooling is sequenced on.
During the unoccupied period, the actuator will
override minimum position setting and drive fully
closed. On a loss of power, the actuator will spring
return fully closed.
When in heating operation, or when outdoor air
temperature or enthalpy conditions are high, economizer operation is locked out, and actuator is held at
minimum position.
The staging relay is used when the first stage compressors must provide mechanical cooling when
assisting the economizer.
The staging relay can be omitted when the second
stage compressors can be used to assist the
economizer with mechanical cooling.
Component Description
1
4C
3
4A 4B
2
5
1.) Damper actuator ... 9901-1865 provides 24v modulating
control of economizer dampers, 25 in. lb. of torque. (Honeywell M7215A-1008)
2.) Discharge sensor ... 9901-0001 provides a signal (3000
Ohms at 25°C or 77°F) to the actuator during free cooling or
economizer mode. The signal opens the economizer
damper until the discharge temperature drops below 55°. At
this time the signal causes the motor to modulate the
damper and mix outside air with return air to maintain a 50°
F. to 56° F. discharge temperature.
3.) Economizer logic ... 9901-1805 accepts input from discharge sensor and outside air sensor. Analyzes input to
control actuator modulation and economizer switching.
Logic also houses minimum position adjustment, enthalpy or
adjustable dry bulb adjustment, power exhaust control, and
CO2 demand control ventilation adjustment. When used
with optional differential sensors in the return air, the logic is
capable of selecting the most economical air available for
cooling. (Honeywell W7212-A1009)
4A.)
Enthalpy sensor ... 9901-0018 senses and combines
temperature and humidity of outdoor air. And also provides
the signal to the economizer logic. (Honeywell C7400A
used on 1008-0100)
4B.)
Adjustable dry bulb...9901-0251 senses temperature of
outside air and provides signal to the economizer logic.
(Honeywell C7650A-1001 used on 1009-0100)
4C.
Fixed dry bulb... 9901-0183 senses temperature of
outside air. If below 70° setpoint, allows for free cooling.
5.)
Wire harness color coded and pre-wired to actuator and
economizer logic.
5
Minimum Position Adjustment
The minimum position potentiometer keeps the outdoor air damper from closing completely during system operation to
provide ventilation.
1. Make sure the factory installed jumper is in place across 3. Connect 24V AC to system and adjust the potentiomterminals P and P1.
eter on the face of the logic module with a screwdriver for
desired minimum position.
2. If remote control of dampers is desired, connect the
remote potentiometer to P and P1 and turn it fully
clockwise before adjusting the minimum position.
Single enthalpy: The enthalpy changeover setpoints is set
to return the outdoor air damper to minimum position
when the enthalpy rises above its set point. The enthalpy
setpoint scale markings, located on W7212 are A,B,C,D
as shown below. The factory-installed 620-ohm jumper
must be in place across terminals + and SR unless using
differential enthalpy.
Single Dry Bulb: The dry bulb changeover setpoint is set
to return the outdoor air damper to minimum position
when the temperature rises above it's setpoint. The
setpoint scale markings, located on the W7212, are
A,B,C,D as shown below. The factory installed 620-ohm
jumper must be in place across terminals + and SR unless
using differential dry bulb.
mA Signal
Adjustable Dry Bulb Changeover Setpoint (1009-0100)
10 11 12 13 14 15 16 17 18 19 20
Enthalpy Changeover Setpoint (A1008-0100)
40
D setting
C setting
B setting
A setting
50
60
70
80
90
100
EXAMPLE FOR DETERMINING
ADJUSTABLE DRY BULB CONTROL SETTING
(1009-0100)
Differential Changeover Setting
Differential enthalpy control utilizes two enthalpy sensors
connected to one W7212 Economizer Control.
The enthalpy setpoint scale markings, located on the
W7212, are A,B,C,D. Turn the setpoint potentiometer fully
clockwise past the D setting. The economizer will select
the air with lower enthalpy for cooling; i.e., if outdoor air
has lower enthalpy than return air, then the outdoor air
damper will be opened to bring in outdoor air for free
cooling. The differential enthalpy connects to SR and + on
the W7212 logic.
Note: The C7650A adjustable dry bulb can also be used
for differential change over. Only the temperature of the
outdoor air and return air will be compared and the best
selected for free cooling.
6
CAUTION
Exercise care when adjusting the
changeover set point and minimum
position setting.
EX
CESSIVE FOR
CE MA
Y
XCESSIVE
FORCE
MAY
DAMAGE THE CONTROLS
POWER EXHAUST INSTRUCTIONS:
Rooftop HVAC Unit
Hinged and
latched filter
access door
MicroMetl series
horizontal economizer
ILL. #1
MicroMetl
Power Exhaust Package
Apply gasketing
this side.
C
Economizer Hoods
Field supplied return
air duct
Side View
"A"
A
Barometric
backdraft damper
"A"
B
Quick disconnect
plug
NOTE: Blower hood
may require field
provided support.
IMPORTANT NOTE: Follow all local codes
when wiring system.
1.) The switch which activates the power exhaust is
an intergal part of the economizer logic. Adjust to
job requirements on the economizer. Install the
horizontal economizer per instructions provided.
2.) Apply gasketing to mating flanges of
exhaust assembly. Lift top of HVAC unit so that
wires can be run to HVAC unit's control compartment. Slide top flange of exhaust section under top
flange of unit and secure in place (ILL. #1).
3.) Apply gasket to mating flanges of fan / hood
assembly. Slide top flange of hood under access
panel's bottom flange and secure fan / hood assembly in place.
Centrifugal
exhaust fan
Contactor provided with power exhaust package.
Specifications (in inches)
MicroMetl Power
B C
Exhaust Part No. A
1882, 4882, 5882 26 3/ " 16 5/ " 22"
8
8
-0102-54930
1882, 4882, 5882 35 1/ " 19" 28 3/ "
4
8
-0202-54930
1882, 4882, 5882 43 1/ " 19" 30 1/ "
4
2
-0302-54930
4.) First Calculate MCA New 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.
5a.) 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 5b.
SEE REVERSE SIDE OF THIS SHEET
FOR WIRING INSTRUCTIONS.
5b.) 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.
*Refer to Diagram 1 on Page 8 for more information.
7
5a
From power
exhaust
terminal block
5b
DIAGRAM 1
NOTES:
1. 575 V transformer No. HT01AH859 is ordered separately from power exhaust.
2. EconoMi$er2 actuator and controller are shipped with the EconoMi$er2 — not with power exhaust.
3. Connections from End Switch plug to the EconoMi$er2 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
8
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.
POWER EXHAUST WIRING
WIRING INSTRUCTIONS
ILL. #3
Rooftop HVAC Unit
STEP 4
• Connect power exhaust cord to HVAC unit
disconnect by removing HVAC unit top
(see ILL. #3).
• Component wired per diagram shown below.
Route line voltage wires back to unit's disconnect
box. Secure wires in place away from all moving
parts.
MicroMetl
Power Exhaust
Package
Field supplied
return air duct
IMPORTANT NOTE:
Follow all local codes when wiring system.
Economizer hood
CAUTION !
Outside air blades will be completely open
before exhaust fan is activated.
CAUTION !
Exhaust fan can cause severe injury. Always
disconnect power before servicing.
Exhaust fan activation
adjustment
ILL. #4
**Wire color can be substituted to
Red, White, Black, and Green
between the motors and power
exhaust terminal block.
24-Volt Transformer Color Code
** Refer to
Diagram 1. Use
the formula on
page 2 and 3 to
determine
electrical
configuration.
Common
Power
Yellow ________ Red - 208V
Yellow ________ Orange - 230V
Yellow ________ Black - 460V
Black _________ Grey - 575V
9
PLUG #2
MODULATING BLOWER POWER EXHAUST (OPTION)
Blower Modulation Installation Instructions (use this page only if the modulating exhaust option has
been ordered)
This 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. Place the HVAC unit in continuous operation mode.
3. 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 is above 0.05” w.g., increase the blower speed by adjusting
the motor pulley.
4. 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.
5. The amp draw must not exceed the values listed below.
6. If the amperage is too high, the blower must be slowed down by adjusting the pulleys. Repeat steps 3 to 6.
If the room pressure is excessive at this point, call MicroMetl for further assistance.
ILL. #13
Factory installed
tubing to atmospheric
pressure port
Factory installed
tubing to room
pressure sensor
25 ft of tubing
factory supplied
Factory installed motor
controller
Return air duct.
Field supplied
10
Transducer factory
installed
Tubing for room pressure
field installed
Factory installed
atmospheric pressure
port. Covered by hood
Maximum Amp Draw
Room pressure sensing
port. Mount to ceiling or wall
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
MODULATING POWER EXHAUST WIRING
ILL. #8
**Wire color can be substituted to
Red, White, Black, and Green
between the motors and VFD.
ORANGE
YELLOW
TR
ORANGE
TR1
ECONOMIZER
LOGIC
ORANGE
24 Volt Power
1
2
5
12
2
14
13A
2
S Series Controller
** Refer to
Diagram 1. Use
the formula on
page 2 and 3 to
determine
electrical
configuration.
Fuse Block
BLUE
YELLOW
BLUE
BLACK
YELLOW
BLACK
10 amp KTK-R Fuses
1682-0201 (12 amp KTK-R Fuses)
G
Setting PID Set-point:
1) Power the Power Exhaust.
CAUTION: MOVING PARTS!
2) Set-point value is displayed (factory pre-set to 125 psi).
3) Using the arrow keys, set the desired pressure level (in w.g. * 1000).
4) In order to fine tune the PID Control, refer to above.
The drive password is 14.
Please note that the PI units displayed on the drive are reference units only.
Multiply PI Units, set-point and feedback, by 0.001 to determine space pressure.
Transducer Output Space Pressure
Vdc
" wg
0
0
1
0.025
1.5
0.0375
2
0.05
3
0.075
4
0.1
5
0.125
6
0.15
7
0.175
8
0.2
9
0.225
10
0.25
PI Units
Psi
0
25
37.5
50
75
100
125
150
175
200
225
250
11