8
TERMINAL
THERMOSTAT
Red
R (24V)
Green
G (Fan)
Orange
O (Rev. Valve)
White
W1 (Heat, 2nd)*
Brown
W2 (Heat 3rd)*
Yellow
Y (Cool)
C (Blue)
C (Common)
*Optional field installed heat connections
Table 4
Internal Wiring:
A diagram detailing the internal wiring of this unit is located
on the electrical box cover. If any of the original wire
supplied with the appliance must be replaced, the wire
gauge and insulation must be the same as the original
wiring.
1. For branch circuit wiring (main power supply to unit
disconnect), the minimum wire size for the length of
the run can be determined from Table 2 using the
circuit ampacity found on the unit rating plate. From
the unit disconnect to unit, the smallest wire size
allowable in Table 4 may be used for the ampacity, as
the Disconnect must be in sight of the unit.
2. Wire size based on 60°C rated wire insulation and 30°
C Ambient Temperature (86°F).
3. For more than 3 conductors in a raceway or cable,
see the N.E.C. for derating the ampacity of each
conductor.
OPERATION
Start-Up Procedure and Checklist
Begin with power turned off at all disconnects.
WARNING
HIGH VOLTAGE!
Disconnect all power before servicing or in-
stalling this unit. Multiple power sources may
be present. Failure to do so may cause proper-
ty damage, personal injury or death.
Air Conditioner Start-up Procedure
1. Turn thermostat system switch to “Cool,” and fan-
switch to “Auto” and turn temperature setting as high
as it will go.
2. Inspect all registers and set them to the normal open
position.
3. Turn on the electrical supply at the disconnect.
4. Turn the fan switch to the “ON” position. The blower
should operate after a 10 second delay.
5. Turn the fan switch to “Auto” position. The blower
should stop after a 60 second delay.
6. Slowly lower the cooling temperature until the unit
starts. The compressor, blower and fan should now be
operating. Allow the unit to run 10 minutes, make sure
cool air is being supplied by the unit.
7. Turn the temperature setting to the highest position,
stopping the unit. The indoor blower will continue to
run for 60 seconds.
8. Turn the thermostat system switch to “OFF” and
disconnect all power when servicing the unit.
WARNING
HIGH VOLTAGE!
Disconnect all power before servicing or in-
stalling this unit. Multiple power sources may
be present. Failure to do so may cause proper-
ty damage, personal injury or death.
Heat Pump Start-Up Procedure
1. Check the cooling mode for the heat pump in the
same manner as above. The reversing valve is
energized when the thermostat is placed in the
cooling position. A clicking sound should be noticeable
from the reversing valve. By lowering the temperature
setting to call for cooling, the contractor is energized.
The compressor, blower and fan should then be
running. After the cooling mode is checked out, turn
the thermostat system switch to “OFF”.
2. Turn the thermostat system switch to “HEAT” and fan
switch to “AUTO”.
3. Slowly raise the heating temperature setting. When
the heating first stage makes contact, stop raising
the temperature setting. The compressor, blower and
fan should now be running with the reversing valve in
the de-energized (heating) position. After giving the
unit time to settle out, make sure the unit is supplying
heated air.
4. If the outdoor ambient is above 80°F, the unit may trip
on its high pressure cutout when in heating mode. The
compressor should stop. The heating cycle must be
thoroughly checked, so postpone the test to another
day when conditions are more suitable but-DO NOT
FAIL TO TEST.
5. If the outdoor ambient is low and the unit operates
properly in the heating cycle, you may check the
pressure cutout operation by blocking off the indoor
return air until the unit trips. If unit operates properly
in the heating cycle, raise the temperature setting
until the heating second stage makes contact.
Supplemental resistance heat, if installed should now
come on. Make sure it operates properly.
NOTE: If outdoor thermostats are installed
the outdoor ambient must be below the set
point of these thermostats for the heaters
to operate. It may be necessary to jumper
these thermostats to check heater operation
if outdoor ambient is mild.
6. For thermostats with emergency heat switch, return
to step 11. The emergency heat switch is located
at the bottom of the thermostat. Move the switch to
emergency heat. The heat pump will stop, the blower
will continue to run, all heaters will come on and the
thermostat emergency heat light will come on.
