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START-UP, ADJUSTMENTS, AND CHECKS
H
S
-
( N
EATING
TART
UP
ATURAL
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.
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 tem-
peratures 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.
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 4 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.
G
/ LP)
AS
Open to
Atmosphere
Pressure Boss
Inlet
Pressure Boss
White-Rodgers Model 36G54 connected to Manometer
16
Rollout Protection
Rollout Protection on Burner Bracket
Secondary
Control Limit
Back of Unit
Secondary Limit Control
High Fire Regulator
Outlet
Adjust
High Fire
Coil Terminal (HI)
On/Off Switch
Common
Terminal (C)
Regulator
Vent
Low Fire
Regulator Adjust
Coaxial Coil
Terminal (M)
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