ELECTRICAL CHECK-OUT CHART
Fan and Heater
For Units Using HF-7062 Control Board
All troubleshooting should be done with GAS SHUT OFF AT TANK. It is recommended to run drop cord from 110 volt power source to test electrical system on heater. However NEVER RUN HEATER WITHOUT IT BEING ELECTRICALLY INTERLOCKED TO FAN. This may cause unit to be severely damaged in case of fan failure.
Before checking out any of the components on the
Purge Delay
Turn on/off switch to on position. There should be 110 volts between points A and B on board. If no voltage present check out flame probe. If 110 volts are present wait 15 seconds and check voltage between points C and D on board if no voltage present purge relay is possibly defective.
Flame Probe
Flame probe should be closed when cool and open when warm. FLAME PROBE MUST BE COOL (CLOSED) FOR UNIT TO START. Check voltage between points A and B. If 110 volts is present then flame probe is probably OK. If no voltage present check between points B and C. If 110 volts present flame probe is defective. If no voltage is present check bin high limit.
Bin High-Limit
THERMOSTAT MUST BE PLUGGED IN AND CALLING FOR HEAT FOR UNIT TO START. Check voltage between points B and E. If 110 volts present then vapor
Vapor High-Limit (Liquid units only)
VAPOR HIGH-LIMIT RESETS AUTOMATI-
CALLY. It must be cool to be closed. Check voltage between points G and B on Board. If voltage is present then vapor
Time Delay Reset
CHECK TO BE SURE TIME DELAY RESET IS PUSHED IN (RESET CONDITION). Check voltage between points I and J. If 110 volts present then time delay reset should be OK. If no voltage present check voltage between points I and D. If 110 volts are present then time delay reset is prob- ably defective. If no voltage present the check housing
IMPORTANT: After approximately 60 seconds of heater operation with gas shut off reset button should kick out. If it does not then check out flame probe.
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