GPG16M Installation Instructions

14
FAN ONLY
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
HEATING STARTUP
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.
11. Turn on the electrical power supply to the unit.
12. Set the thermostat to desired setting.
Gas Supply And Manifold Check
Gas supply pressure and manifold pressure with the burners operating must be as specified on the rating plate.
Rollout Protection
Rollout Protection on Burner Bracket
Secondary
Control Limit
Back of Unit
Secondary Limit Control