16
• Verify that the ductwork is sealed to prevent air
leakage.
• Verify that the line voltage power leads are securely
connected and the unit is properly grounded.
• Verify that the low voltage wires are securely connected
to the correct leads in the low voltage area of the
control box.
• Verify that the gas line service pressure does not
exceed 10.0 inches WC (0.36 psig), and is not less than
4.5 inches WC (0.16 psig) for natural gas. For LP gas
the line service pressure must not exceed 14 inches
WC (0.51 psig) and must not be less than 11.0 inches
WC (0.40 psig).
• Verify that the flame roll-out control is closed. If
necessary, press the red button to reset the control. DO
NOT install a jumper wire across the control to defeat
its function. If the control reopens upon start-up, DO
NOT reset the control without identifying and correcting
the fault condition which caused the control to trip.
• Verify that the gas line has been purged and all
connections are leak tight.
• Verify that all exterior panels are replaced and securely
fastened.
• Verify that the outdoor fan turns freely.
• Verify that the power supply branch circuit overcurrent
protection is sized properly.
• Verify that the thermostat is wired correctly. The
thermostat function switch should be set to “Off” and
the thermostat fan switch should be set to “Auto.”
!
WARNING:
If the unit is equipped with a crankcase heater,
allow 24 hours prior to continuing the start up
procedures to allow for heating of the refrigerant
compressor crankcase. Failure to comply may
result in damage and could cause premature failure
of the system. This warning should be followed at
initial start up and any time the power has been
removed for 12 hours or longer.
START-UP PROCEDURE
Close all electrical disconnects to energize the system.
Air Circulation — Leave the thermostat system switch set
to “Off” and set the thermostat fan switch to “On.” The
blower motor should run continuously. Check for air delivery
at the register(s). Ensure that there are no obstructions at
Note: If the same speed is required for both heating and
cooling, remove either the red or orange wire from the
blower motor. Next, obtain the jumper wire from the
homeowners packet and connect it to the blower relays
at the coils on the blue wire and red wire side.
Check all factory wiring per the unit wiring diagram and
inspect the factory wiring connections to be sure none
loosened during shipping or installation.
Room Thermostat — Several options are available for a
room thermostat depending on the accessories installed with
the unit. The available thermostats recommended for use
with the gas/electric units are listed with the accessories in
Table 10. Select a thermostat which operates in conjunction
with the installed accessories. The thermostat should be
mounted about five feet above the floor on an inside wall. The
thermostat should be kept away from drafts, slamming
doors, lamps, direct sunlight and the supply air flow.
To install the thermostat:
1. Position the subbase on an inside wall and mark the
mounting holes and thermostat cable openings.
2. Cut out the cable opening and route the thermostat
cable from the unit’s low voltage compartment to the
thermostat location. The thermostat cable is supplied
by the installer.
3. Connect the cable leads to the subbase or thermostat
terminals and to the unit’s low voltage connector on
the furnace board as shown in Figure 9. A system
wiring diagram is also provided on the inside of the
louvered control access panel and in Figure 10 of
these installation instructions.
4. Secure the subbase or thermostat to the wall using
screws provided with the thermostat.
5. If subbase is used, install the correct thermostat
housing to subbase.
6. Refer to thermostat instruction sheet for complete
detailed mounting information.
To determine the heat anticipator setting, either:
1. Add the current draw of the system components or,
2. Measure the current flow on the thermostat R-W
circuit after the circulating blower motor has started.
SYSTEM CHECK
Pre-Start Check List
• Verify that the unit is level to allow proper condensate
drainage.
• Verify that there is free airflow to and from the outdoor
coil and that all clearance requirements are met.