Page 12 of 21
507389-01
Issue 1504
To Shut Down Main Burners
1. Turn off electrical power to unit.
2. Move the ON/OFF switch to the “OFF” position
(see Figure 6).
OPERATION
Operation of the unit is automatic and will provide heating and
cooling depending on the setting of the thermostat.
Heating
1. Turn on main power supply.
2. Open manual gas shutoff valve.
3. Set thermostat system to “HEAT”.
4. Set thermostat to temperature desired.
Cooling
1. Turn on main power supply.
2. Set thermostat system switch to “COOL”.
3. Set thermostat to temperature desired.
Heating Sequence of Operation
1. Thermostat calls for heat.
2. Combustion blower starts and proper air flow is proven by
the pressure switch closing.
3. Blower continues to operate for 30 seconds prior to the
burners lighting.
4. Ignition control begins spark and opens gas valve. The
burners are lit. Ignition is proved through the flame sensor.
5. Circulating air blower starts 30 seconds after the burners
light.
6. When the thermostat is satisfied, the burners and combustion
blower shut off.
7. Circulating air blower will shut off 120 seconds later.
If the burners should fail to ignite, the ignition control will try to
ignite the burners a total of three times. Should the burners fail
to ignite within the three trials for ignition, the ignition control
will lock out for 1 hour before beginning another ignition cycle.
To reset the control, turn the thermostat down or off for 10
seconds and then set to desired setting. At this time, the ignition
sequence will try again.
Blower Control
The blower will start approximately 30 seconds after the
burners ignite and will stop approximately 120 seconds after the
thermostat is satisfied. The time delay is preset at the factory
and timing can not be adjusted.
Cooling sequnce of Operation
When the thermostat system switch is set for “COOL”, the blower
will start 5 seconds after the thermostat calls for cooling and will
stop 90 seconds after the thermostat is satisfied.
Continous fan Operation
Continuous operation of the air handling blower will be obtained
if the thermostat fan switch is set to “ON”. With the thermostat
fan switch set to “AUTO”, the air handling blower will cycle
corresponding with the thermostat cycling.
To Shut Down Unit
For temporary or short periods of shutdown, set the thermostat
system switch to “OFF”. For a prolonged period of shutdown, set
the thermostat system switch to “OFF” and turn off the electrical
power supply and the gas supply to the unit.
Gas Valve
Figure 6
Gas Inlet
ON/OFF
SWITCH
Gas Inlet
Pressure
test tap
Regulator
adjustment
Screw
(Under Cap)
Gas manifold
Pressure test
tap
MAINTENANCE
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
dangerous operation, Serious injury, death or property
damage.
Improper servicing could result in dangereous operation,
Serious injury, death or property damage
•
Before servicing. disconnect all electrical power to
furnace
•
When servicing controls, label all wires prior to
disconnecting reconnect wires correctly.
•
Any disassembly of components containing flue
or vent gases shall be done by a qualified service
agency.
•
Verify proper operation after servicing.
WARNING