Electrical CHECK-OUT Chart, Purge Delay

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 HF-7062 heater controller board check to make sure that there is power to the board. Turn on/off switch to on position, check voltage between terminals L1 to L2 on the board there should be 110 volts present. If no voltage present check to make sure Heater housing high- limit is reset. If housing high-limit is reset check it and the on/off toggle switch to see if they are defective. If they check out OK then check to be sure that the unit has a good neutral. All tests below should be done with power on and on/off switch in on position.

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 high-limit should be OK. If no voltage present check between points F and B. If 110 volts present check out thermostat circuit. If no voltage present check out vapor high-limit and housing high-limit.

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 high-limit should be OK. If no voltage present check between points H and B. If voltage present then vapor high-limit is probably defective. If no voltage present check for bad connections on board or lack of a good neutral line coming into heater.

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 hi-limit or on/off switch.

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.