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Tool Talk Discussion Forum

Re: Propane furnace in COLD weather

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Bob Bancroft

01-21-2013 17:08:01

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Do you know what your regulated pressure is from the tank to the house, and then what it is in the house?

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01-21-2013 19:38:06

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 Re: Propane furnace in COLD weather in reply to Bob Bancroft, 01-21-2013 17:08:01  
It has a regulator on the tank, and then one at the house. I do not know what the pressures are. I did ask that the propane company (Cenex) come out and hook the truck up to the tank to pressurize it. I have watched them do this before and listened as the tank equalizes with the truck pressure. This usually takes care of my problems. It may be that I just don't use enough propane since it is my off-peak heat, so they only come out to fill it every other year. Maybe the pressure in the tank gets too low?Thanks

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01-22-2013 09:09:51

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 Re: Propane furnace in COLD weather in reply to SW3, 01-21-2013 19:38:06  
What ????

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Indiana Ken

01-22-2013 07:08:22

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 Re: Propane furnace in COLD weather in reply to SW3, 01-21-2013 19:38:06  
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Propane begins to boil at minus 43.7 degrees F, at that temperature the pressure in your tank will measure zero psi. At minus 20 degrees F the tank pressure will be approximately 10.3 psi and at minus 30 degrees F 5.3 psi. Conversely at 100 degrees F the tank pressure will measure approximately 175.3 psi. The tank pressure is proportional to temperature - the gas company cannot pressurize your tank.

Typically propane furnaces will specify a gas pressure requirement at the furnace manifold. My furnace requires 10" H20 (inches of water). Since 10"H20 is equal to approximately 0.361 psi there should be sufficient pressure in your tank even at minus 30 degrees. There are likely three pressure regulators in your system, a high pressure at the tank, low pressure at the house and finally the manifold pressure on the furnace.
I would suggest the regulators be checked and adjusted as required and also have the furnace checked/cleaned as others have posted.
Good luck

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01-21-2013 20:53:43

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 Re: Propane furnace in COLD weather in reply to SW3, 01-21-2013 19:38:06  
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There are a multitude of possiable reasons for what you describe but one of them "is not" because the tank needs to be "pressurized". The pressure does drop as tempature drops but there is nothing other than warming the tank you can do about it. We could give you every possiability and you probably wouldn't be any closer to resolving it.

Call your supplier and tell them what is going on and ask that they have a technician come check your system. Otherwise you will mess with it ubtil spring thaw.

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