13
5. The compressor and outdoor fan will be de-energized when the thermostat opens.
6. The indoor blower continues to run at low cool speed for approximately 60 seconds after the thermostat is satisfied. This
allows additional cooling from the indoor coil to be transferred to the conditioned space. Then, the indoor blower is de-
energized.
NOTE:
A 180-second anti-short cycle is integral to the control and prevents recycling of the compressor.
F
AN
O
NLY
1. Thermostat calls for FAN ONLY by energizing “G”.
2. The indoor blower is immediately energized at the low heat speed.
3. The indoor blower is immediately de-energized once thermostat call for FAN is removed.
STARTUP, ADJUSTMENTS, AND CHECKS
H
EATING
S
TARTUP
This unit is equipped with an electronic ignition device to automatically light the main burners. It also has a power vent blower to
exhaust combustion products.
On new installations, or if a major component has been replaced, the operation of the unit must be checked.
Check unit operation as outlined in the following instructions. If any sparking, odors, or unusual sounds are encountered, shut off
electrical power and check for wiring errors, or obstructions in or near the blower motors.
Duct covers must be removed before
operating unit.
Heat Anticipator Setting
Set the heat anticipator on the room thermostat to 0.4 amps to obtain the proper number of heating cycles per hour and to
prevent the room temperature from overshooting the room thermostat setting.
Rollout Protection Control
The rollout protection device opens, cutting power to the gas valve, if the flames from
the burners are not properly drawn into the heat exchanger. The rollout protection
device is located on the burner bracket. The reason for elevated temperatures at the
control must be determined and repaired prior to resetting this manual reset control.
Secondary Limit Control
The secondary limit control is located on the top of the blower scroll assembly. This control
opens when elevated temperatures are sensed. Elevated temperatures at the control are
normally caused by blower failure. The reason for the opening should be determined and
repaired prior to resetting.
If the power to the unit is interrupted during the heating cycle, it may cause the secondary
limit to trip. Once the blower compartment temperature drops below the limit reset
temperature, the limit will automatically reset.
Pre-Operation Checks
1. Close the manual gas valve external to the unit.
2. Turn off the electrical power supply to the unit.
3. Set the room thermostat to its lowest possible setting.
4. Remove the heat exchanger door on the side of the unit by removing screws.
5. This unit is equipped with an ignition device which automatically lights the main burner.
DO NOT try to light burner by any other method.
6. Move the gas control valve switch to the OFF position. Do not force.
7. Wait five minutes to clear out any gas.
8. Smell for gas, including near the ground. This is important because some types of gas
are heavier than air. If you have waited five minutes and you do smell gas, immediately
follow the warnings on page 3 of this manual. If having waited for five minutes and no gas smell is noted, move the gas control
valve switch to the ON position.
9. Replace the heat exchanger door on the side of the unit.
10. Open the manual gas valve external to the unit.
Rollout Protection
Rollout Protection on Burner Bracket
Secondary
Control Limit
Back of Unit
Secondary Limit Control
