| Author |
Message |
Mike McC (64.252.236.206)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 10, 2003 - 7:40 pm: | |
I have a 40,000 btu propane furnace taken out of an old skoolie conversion I parted out. Was hooked up to 12v only. Unit has connections for 12v,& 120v ac. I made a cord and connected to 120v ac, hooked up a propane tank to test unit out before installing. The blower works when I short the thermostat wires, and the pezios spark above the burner, but I don't seem to be getting any gas thru. (won't light) Does the gas valve operate on dc current? or should I take the valve apart and check for crud. The terminals on top of valve ar labeled TH and TR if that makes a difference. Thanks
Mike McCarthy
Forestville CT
GMC PD4903 348 |
Jim Stacy (12.87.108.224)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 10, 2003 - 10:27 pm: | |
This unit probably has a 120VAC to 12VDC power supply and really runs on 12V. Blower has to move enough air to operate a sail switch (small piece of metal in the blower air path attached to a microswitch.) That will then allow the gas valve to open. Are you getting power to the gas valve? Is this a newer unit with high voltage, board controlled spark or a manually operated piezo crystal lighting a standing pilot?
Also I found out a weird feature of the new OPD valves on the propane tanks. If the new valves are turned on too quickly they have a "major leak" control system that will not allow the gas to flow at all! They must be cracked open gently to prevent this shutdown. Some of my valves are very touchy, some don't seem to be as sensitive.
FWIW.
Jim Stacy |
mark (66.43.13.46)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 11, 2003 - 12:13 am: | |
Hey, Mike...
I hope you did'nt ruin the gas valve by puting 110 volts to it.
The gas valve uses only MILLIVOLTS to operate. The voltage comes from the pilot assembly itself. The 110 volt connection is a mystery to me ... probably just for the fan operation of the furnace.
All gas valves that I have seen use the voltage produced by the pilot assembly to provide the voltage necessary (millivolts) to operate the system
Is your furnace a 'standing pilot' or a DSI unit?
mark
gillig 636D |
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