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recommended T-Stat Wire
Unit to T-Stat (Length in FT)
Thermostat
Wire gauge
2-Wire
(Heating)
24
55
22
90
20
140
18
225
Table 3. Thermostat Wire gauge
G R W 2 C E O Y
G
Green
R
Red
W
Brown
Orange
W 2
For 2-Stage
Heater
Kits
C
Black
Air Handler
Typical Heat Pump with Standard Air Handler
Thermostat
G R W 2 C E O Y
G
Green
R
Red
White
W
C
Black
Air Handler
Typical Heat Pump with
Outdoor Thermostat and Air Handler
Figure 2. Typical Thermostat connections
6
5-Wire
(Heating/Cooling)
25
45
70
110
Thermostat
NOTE: Jumper
between W2 and E is
required when no OD
T-Stat is used.
R
W 2
C
O Y
Heat Pump OD
Section
E
R
W 2
C
O Y
Heat Pump OD
Section
STarT up & aDjuSTmenTS
pre-Start check list
√ Verify the indoor unit is level and allows proper
condensate drainage.
√ Verify the outdoor coil and top of the unit are free from
obstructions and debris, and all equipment access/
control panels are in place.
√ Verify air filters are cleaned and properly installed.
√ Verify duct work is sealed to prevent air leakage.
√ Verify line voltage power leads are securely connected
and the unit is properly grounded.
√ Verify low voltage wires are securely connected to the
correct leads on the low voltage terminal strip.
√ Verify power supply branch circuit overcurrent protection
is sized properly.
√ Verify the thermostat is wired correctly.
Start-up procedures
The thermostat's function mode should be set to OFF and
the fan mode should be set to AUTO. Close all electrical
disconnects to energize the system.
Air Circulation - Indoor Blower
1. Set the thermostat system mode on OFF and the fan
mode to ON.
2. Verify the blower runs continuously. Check the air delivery
at the supply registers and adjust register openings for
balanced air distribution. If insufficient air is detected,
examine ductwork for leaks or obstructions.
3. Set the thermostat fan mode to AUTO and verify the
blower stops running.
System Cooling
1. Set the thermostat's system mode to COOL and the
fan mode to AUTO. Gradually lower the thermostat
temperature setpoint below room temperature and
verify the outdoor unit and indoor blower energize.
2. Verify blower wheel is spinning in direction indicated by
arrow. Feel the air being circulated by the indoor blower
and verify that it is cooler than ambient temperature.
Listen for any unusual noises. If unusual sounds occur,
determine the source of the noise and correct as
necessary.
3. Verify HI and LO refrigerant pressures.
4. Allow the system to operate for several minutes and then
set the temperature selector above room temperature.
Verify the fan and compressor cycle off with the
thermostat. noTe: The blower should also stop unless
fan mode is set to the ON position.
System Heating (optional)
1. Set the thermostat's system mode to HEAT and the
temperature mode above room temperature.
2. Verify the optional heating equipment (furnace or
electric heat) and indoor blower energize. Feel the air
being circulated by the indoor blower and verify that
it is warmer than ambient temperature. Listen for any
unusual noises. If unusual sounds occur, determine the
source of the noise and correct as necessary.
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