Gas and Oil Home Heating Furnaces - Pilot Blows Out on new Furnace
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11-03-00, 01:53 AM
A new Williams wall furnace was installed on a friends 20'X20' cabin. Vents straight thru the roof, 2' above roof line on a 4/12 pitch.
Have replaced gas valve and thermopile w/ no luck. Have observed slight rollout and suspect furnace blows itself out. How do we solve this. Can swing the doors open and shut and they will not blow out the flame. Have wiggled the thermostat control on the wall ecessively and had the going off and on of the furnace blow out the flame. What do we do?
Have replaced gas valve and thermopile w/ no luck. Have observed slight rollout and suspect furnace blows itself out. How do we solve this. Can swing the doors open and shut and they will not blow out the flame. Have wiggled the thermostat control on the wall ecessively and had the going off and on of the furnace blow out the flame. What do we do?
11-03-00, 05:24 AM
Sounds like a venting problem... when you say 2' above roof line, is that above the peak? or just 2' from where it breaches the roof? it sounds like you are getting a draft down the venting or the vent could be plugged... the top of vent should have nothing around it for ten feet.. and best to be above roof peak
11-03-00, 04:47 PM
20 X 20 cabin..Are you by any chance using propane/butane/bottled gas? If so, your symptoms are classic. Your gas pressure probably needs to be adjusted down to the manufacturers specs. This type of gas is much heavier than natural and is much more dangerous. Have it checked by the company you purchase gas from.
11-03-00, 08:55 PM
Hi:crowsnest
This is a typical problem with that brand furnace. It lights up too fast and burns a burner flame on the soft side.
Nothing wrong with a soft flame. Once underway these furnaces heat well and use energy efficiently.
It's that fast lightup that often causes the burner flame to roll out and at times takeout the pilot flame with it.
Most likely not a draft coming down the vent from the roof. That's what the downdraft diverter prevents from happening.
That initial lightup of the burner may need to be adjusted via the appliance regulator. And the secondary air vent may need to be adjusted open some.
Correctly adjusting that already tiny pilot flame may also need to be done. I have been rather successful using this pilot adjusting method, when all the other items are set correctly.
These are not adjustments recommended for the homeowner to attempt. I suggest you have the installation service company or the local gas company check and make the needed adjusts adjustments.
Good Luck,
TomBartco
Natural Gas Energy Technician and Consultant.
This is a typical problem with that brand furnace. It lights up too fast and burns a burner flame on the soft side.
Nothing wrong with a soft flame. Once underway these furnaces heat well and use energy efficiently.
It's that fast lightup that often causes the burner flame to roll out and at times takeout the pilot flame with it.
Most likely not a draft coming down the vent from the roof. That's what the downdraft diverter prevents from happening.
That initial lightup of the burner may need to be adjusted via the appliance regulator. And the secondary air vent may need to be adjusted open some.
Correctly adjusting that already tiny pilot flame may also need to be done. I have been rather successful using this pilot adjusting method, when all the other items are set correctly.
These are not adjustments recommended for the homeowner to attempt. I suggest you have the installation service company or the local gas company check and make the needed adjusts adjustments.
Good Luck,
TomBartco
Natural Gas Energy Technician and Consultant.
11-04-00, 01:36 AM
Thanks Tom, and others. In answer to other replies, stack is 2' above peak and uses natural gas. Stove on same line has 3 pilots that have never gone out, so suspect gas pressure is okey. Tom seems to have hit the nail on the head and will relay the information. Thanks again.
Danny Crow
Danny Crow