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Field-Provided Disconnect
If field-installing an additional disconnect switch, it
is recommended that there is at least four feet of
service room between the switch and system access
panels. When providing or replacing fuses in a fusible
disconnect, use dual element time delay fuses and size
according to the rating plate.
Discharge Air Temperature Sensor
Without Indirect Gas Furnace
For units without an indirect gas furnace, the discharge
air temperature sensor is factory-mounted in the blower
discharge section of the unit behind the blower cut off
plate.
WARNING
Discharge air temperature sensor is to be field-
installed prior to unit start-up on units with an indirect
gas furnace.
With Indirect Gas Furnace
For units with an indirect gas furnace, the discharge
air temperature sensor is to be
field-installed prior to unit start
up at least three duct diameters
downstream of the heat exchanger
or where good mixed average
temperature occurs in the ductwork.
The discharge air sensor is shipped
loose and can be found in the unit's
control center. See the unit-specific
wiring diagram for connection locations.
®
Typical Control Center Components with
Microprocessor Control
8
1
10
10
15
16
16
17
17
11
6
13
Individual components and locations will vary.
1. Main disconnect (non-fusible, lockable)
2. Motor starter - outdoor air fan
3. Motor starter - exhaust air fan
4. Motor contactor - energy wheel
5. 24 VAC control transformer
6. 24 VAC terminal strip
7. Fuses for blower motors
8. Grounding lug
9. Distribution block
10. Compressor fuse blocks
Optional Components
11. Microprocessor controller
12. Dirty filter pressure switches
13. GreenTrol®
14. Frost control pressure switch
15. Energy recovery wheel VFD
16. Compressor contactors
17. Condenser fan contactors
Energy Recovery Ventilator with Heating and Cooling
General Description - NOT model specific
5
9
7
7
3
2
4
12
14
17
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