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Automatic Gas Valve
(with manual shut-off)
To derate the furnace requires knowing the heating value of
the gas at the installation site. Heating values at particular job
sites vary for two reasons:
1. The chemical mixture of the gas varies across regions and
is expressed as the "sea level heating value".
2. The heating value varies by altitude. For this reason,
especially in high altitude areas, the local gas utility specifies
the heating value at the residence's gas meter as the "local
value".
WARNING:
This unit was equipped at the factory for use with
natural gas only. LP/Propane cannot be used with this
unit. Failure to follow safety warnings exactly could
result in serious injury, death or property damage.
START UP & ADJUSTMENTS
Pre-Start Check List
√ Verify the unit is level and allows condensate to drain.
√ Verify all clearance requirements are met and there is free
airflow to and from the outdoor coil.
√ Verify that the duct work is sealed to prevent air leakage
and air filter is installed.
√ 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 terminals 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.
√ Verify that the burner limit 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.
Shut-Off Valve with 1 /8 NPT plugged tap
Figure 7. Typical Gas Hookup - Right Side Entry
NOTE: Some utilities require Shut-Off
Valve to be 4 to 5 feet above floor
Ground
Joint
Union
√ 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.
Start-Up Procedure
WARNING:
If this unit is equipped with crankcase heaters, allow
24 hrs for heating of the refrigerant compressor
crankcase prior to start up or anytime the power
has been removed for more than 12 hrs. Failure to
comply may result in damage or cause premature
failure of the system.
Air Circulation
Leave the thermostat system mode on OFF, and set the fan
mode to ON. Blower should run continuously. Check the air
delivery at the supply registers and adjust register openings
for balanced air distribution. Examine ductwork for leaks or
obstruction if insufficient air is detected. Set the thermostat
fan mode to AUTO. The blower should stop 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 compressor,
fan and indoor blower energize.
2. 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. Allow the cooling 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 will also stop after a 60 second delay.
Dripleg
13
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