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
INSTALLATION INSTRUCTIONS
MicroMetl
For 1682/4682/5682 Series
CAUTION!
Always disconnect power before changing
filters.
ILL. #2
(7.5-12.5 Ton Only)
CAUTION!
Exhaust fan can cause severe injury. Always
disconnect power before servicing.
ILL. #1
INSTRUCTIONS
1. Disconnect the power to HVAC unit.
2. Remove the bottom panel from the HVAC
unit and discard. Remove top filter access
door and set aside for later use. (ILL. 1)
3. Uncrate the MicroMetl economizer
4. Remove the discharge air sensor from the
economizer and install in the supply air
chamber/duct. See wiring diagram and ILL.
6A.
5. Install the power exhaust supports for 200
and 300 styles. Use #12 x 1” tek screws to
secure the supports to the base of unit (3
each). Use #8 x 1/2” tek screws to secure
the supports to the unit’s economizer post
(2 each). (ILL. 2 and 2A)
6. Slide the economizer into the return
chamber, being sure not to pinch the
harness. (ILL. 3) The rear flange of the
economizer slides under the tab on the
duct flanges (see rear flange detail). Secure
economizer in place through side and
bottom mating flange holes.
7. Connect the 12 pin plug/harness form
the economizer into the 12 pin plug in the
HVAC unit.
HVAC unit’s
filter door
Unit
Save
Disc
ard
#12
Screws
HVAC unit’s bottom
panel. Remove and
discard.
Factory Provided supports
(2) Flush to unit side
ILL. #2A
ILL. #3
Power
Exhaust
Support
Unit
HVAC unit
corner post
#8 Screw
Power Exhaust
Support Detail
(Top View)
Economizer
Power Exhaust Specifications
MicroMetl
Part No.
External Static
in. wg. (2)
1682-0103
208/230V 3PH
4682-0103
460V 3PH
5682-0103
575V 3PH
1682-0203
208/230V 3PH
4682-0203
460V 3PH
CFM performance
0.1
0.2
0.25
0.3
Full
Load
Amps(1)
2375
2125
2000
1850
1.1
3300
3000
2700
1.7
575V 3PH
1.1
6.6/6.6
460V 3PH
MMC
1/2
1725
1
3.3/3.4
3800
208/230V 3PH
575V 3PH
1725
.65
1682-0303
5682-0303
HP
Economizer clip
on HVAC unit
2.3/2.2
5682-0203
4682-0303
Motor
RPM
4200
4075
4000
3850
3.3
Economizer
Slide
economizer
rear flange
into tab
Unit base
1725
2
Rear Flange Detail
2.4
3035 N. Shadeland Ave, Suite 300 Indianapolis, IN. 46226
MMC WEST
202 South 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. 1999-21P
Copyright MicroMetl Corporation 2003 All rights reserved
1
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
MicroMetl Integrated Economizers
The purpose of an economizer is to use outdoor air for cooling,
whenever possible, to reduce compressor operation.
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.
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
automatically locked out during the heating mode and holds the
outdoor air damper at the minimum position settings.
When in heating operation, or when outdoor air temperature or
enthalpy conditions are high, economizer operation is locked out,
and actuator os held at minimum position.
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.
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.
If the mixed or discharge temperature is above 56O F, actuator
will open to admit additional outdoor air until the temperature
return 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. If the fully open
actuator cannot satisfy the space demand, mechanical cooling is
sequenced on.
3
Component Description
6
1
4C
3
4A
2
4B
5
1. Damper actuator ...9901-1865 provides 24v modulating
control of economizer damper, 25 in. lb. of torque,
(Honeywell M7215A-1008)
4A. Entahlpy 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)
2. Discharge sensor ...9901-0001 provides a signal (3000
Ohms at 25O C or 77O F) to the actuator during free cooling
or economizer mode. The signal opens the economizer
damper until the discharge temperature drops below 55O.
At this time the signal causes the motor to modulate the
damper and mix outside air with return air to maintain a 50O
F to 56O F discharge temperature.
4B. Adjustable dry bulb ...9901-2251 senses temperature of outside air and provides signal to the economizer logic. (Honeywell C7660A-1001 used on 1009-0100)
4C. Fixed dry bulb ...9901-0183 senses temperature of outside air. If below 70O setpoint, allows for free cooling.
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 sensor in the return air, the logic is
capable of selecting the most economical air available for
cooling. (Honeywell W7212-C)
4
5.
Wire harness color coded and pre-wired to actuator and economizer logic.
6.
Compressor lockout ...9901-0252 locks out compressor
when temperature falls below 35OF (+/- 5OF). Shipped with
economizer, but must be field wired, if desired.
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.
Power Exhaust Static Data
X denotes factory settings
X denotes factory settings
11