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ConTrol operATIng seQuenCe / unIT ComponenTs
ConTrol operATIng seQuenCe
Upon a call for heat from the thermostat, power is supplied to
the power exhauster motor. The unit will go through a purge
period and then the direct spark igniter will be energized. At the
same time, the main valve in the combination control valve will
open to allow gas to flow to the burners. If the fan motor has
figure 18.1
major gas, electrical service, safety and other Components
➁
➀
1.
Power Exhauster
2.
Pressure Switch
3.
Integrated Direct Spark Control
Board
figure 18.2
unit Heater rear view
Fingerproof Fanguard
Fan Motor
Vent Pipe Connection
18
➃
➉
➂
➄
4.
Combination Gas Control
5.
Control Transformer
6.
Flame Sensor (hidden)
7.
Flame Rollout Switch
Electrical Access
Mounting Brackets
Gas Pipe Hole
Lighting / Operating
(Gas Pipe Field Supplied)
not already started it will start shortly. If a flame is not sensed
for any reason the main valve will close and there will be a
short purge period before ignition is tried again. If the flame is
not sensed after four tries there will be at least a one hour wait
before ignition is tried again.
➅
➈
Holes
Access Panel with
Instructions
6-583.2
➆
8.
Auto Reset Limit Control (hidden)
9.
Direct Spark Igniter (hidden)
10. Manual Reset Control (hidden,
propeller 100-125 only)
➇
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