750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
2-5
2.4 — Components Common to all Boilers
FIGURE 2-5. Components and Controls
The flame detector portion of the control monitors both oil and gas flames and provides protection in the event of
loss of a flame signal.
The control recycles automatically during normal operation, or following a power interruption. It must be manually
reset following a safety shutdown caused by a loss of flame. An internal checking circuit, effective on every start,
prevents burner operation in the event anything causes the flame relay to hold in during this period.
18. Indicator Lights Provide visual information of boiler operation as follows (indicator lights vary with
controls provided):
• Flame Failure
• Load Demand
• Fuel Valve (valve open)
• Low Water
19. Program Relay and Flame
Safeguard Control
Automatically programs each starting, operating, and shutdown period in conjunc-
tion with operating limit and interlock devices. Includes, in a timed and proper
sequence, the operation of the blower motor, ignition system, fuel valve(s), and the
damper motor. The sequence includes air purge periods prior to ignition and upon
burner shutdown.
Component/Control Description
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