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OPERATING INSTRUCTIONS
Thermostat styles vary. Some models may not include the
AUTO mode and others will have the AUTO in place of the
HEAT and COOL. Others may include all three. Please
refer to the thermostat manufacturer's User manual for
detailed programming instructions.
The thermostat should be mounted about 5 feet above the
fl oor on an inside wall and not on an outside wall or other
location where its operation may be adversely affected by
radiant heat from fi replaces, sunlight, or lighting fi xtures,
and convective heat from warm air registers or electrical
appliances.
Cooling Operation (1 or 2-Stage Operation)
1. Set the thermostat system mode to COOL and the
thermostat fan mode to AUTO. See Figure 1.
2. Set the thermostat temperature selector to the desired
temperature level. The outdoor fan, compressor, and
indoor blower will all cycle on and off to maintain the
indoor temperature at the desired cooling level.
NOTE: If the temperature level is re-adjusted, or the
system mode is reset, the fan and compressor in the
outdoor unit may not start immediately. A protective
timer circuit holds the compressor and the outdoor fan
off for approximately 5 minutes following a previous
operation or the interruption of the main electrical
power.
Heating Operation (2 Stage)
1. Set the thermostat system mode to Heat and the
thermostat fan mode to AUTO. See Figure 1.
2. Set the thermostat temperature selector to the
desired temperature level. The indoor blower and
gas heat module will cycle on and off to maintain
the indoor temperature at the desired heating level.
NOTE: On some units there is a factory set 3 minute
time delay between Stage 1 and Stage 2 heat when
Stage 2 heating is required. See Unit wiring diagram
label.
WARNING:
If overheating occurs, or the gas supply fails to
shut off, shut off the gas valve to the unit before
shutting off the electrical supply.
NOTE: This unit is equipped with a manual-reset fl ame
roll-out limit switch. This switch acts to verify that the
burner fl ame is being drawn into the heat exchanger
tubes. If the fl ame is not being drawn into the tubes, the
fl ame roll-out switch will open within several seconds.
When this switch opens, the gas valve will de-energize
to stop the fl ow of gas. The combustion inducer will stay
energized and continue to operate until the thermostat is
satisfi ed or the switch is closed. Do not reset the fl ame
roll-out switch before identifying and correcting the fault
3
Fan
System
Mode
Figure 1. Digital Thermostat
condition that caused the switch to open. If the switch
will not reset or continues to open, immediately contact
a qualifi ed serviceman to identify and repair the problem.
System Shutdown
Set the thermostat system mode to OFF and the thermostat
fan mode to AUTO. See Figure 1. NOTE: The system will
not operate, regardless of the thermostat temperature
selector's setting.
Operating the Indoor Blower Continuously
Set the thermostat fan mode to ON (or CONT on some
thermostat models). See Figure 1.
The indoor blower will start immediately, and will run
continually until the fan switch is reset to AUTO.
The continuous indoor blower operation can be obtained
with the thermostat system switch set in any position,
including OFF.
The continuous indoor blower operation is typically used to
circulate the indoor air to equalize a temperature imbalance
due to a solar load, cooking, or fi replace operation.
SYSTEM MAINTENANCE
CAUTION:
Verify all electrical power to the unit is
disconnected and the gas is shut off before
performing the following recommended
maintenance.
Proper maintenance is most important to achieve the best
performance from the appliance and should be performed
by a qualifi ed service technician at least once a year.
Follow the maintenance schedule and the instructions
below for years of safe, trouble free operation.
• Do not place combustible materials on or against the
cabinet.
• Do not store gasoline or any other fl ammable vapors
and liquids in the vicinity of the unit.
• Annually inspect the physical support of the unit to
ensure that it is physically sound without sagging,
Temperature
Mode
Selector
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