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12-15-2007, 09:48 PM
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#1
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Member
Join Date: Apr 2007
Location: Wes Taycksus Y'all
Posts: 31
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Heatpump to furnace
If I leave the switch on Heatpump (45 degrees) & the outside temp falls below freezing, will the furnace automatically turn on? Or do I need to leave the furnace running? I will be leaving my unit for several days & it warms up in the day, but could get down in the 20's at night. I don't want to risk running out of propane while I'm gone.
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12-15-2007, 10:16 PM
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#2
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Senior Member
Join Date: Jun 2005
Location: Texas
Posts: 482
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We have two heat pumps, so we don't run the furnace very much. When the heat pump(s) are set to run, they will run, per the thermostat setting, until the outside temp reaches freezing (prox). At that point, the heat pumps shut off, and the furnace comes on automatically. I assume the reverse will happen, as the outside temperature begins to rise.
When this happened for us the first time, the noise of the furnace was startling, as we didn't know what was happening in the middle of the night. After looking in the data provided by Doubletree, we found this "furnace action" fully explained, so that made everything "ok".
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Robert
Robert and Carlene
2005 RE3, S/N 2107 (sold Jan. 2010)
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12-16-2007, 09:19 AM
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#3
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Senior Member
Join Date: Aug 2005
Location: Lindsay Ont, and Gulf Coast Florida
Posts: 138
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Ours works in exactly the same way. Set it and forget it. During the night the furnace comes on when below freezing and then in the morning when it warms up a bit the heat pump takes over again. Love it.
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12-17-2007, 05:15 PM
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#4
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Member
Join Date: Apr 2007
Location: Wes Taycksus Y'all
Posts: 31
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Thanks. It did exactly as you said. We had our heat pump set on 60 degrees and it stayed about 59 in the bedroom all night. The low outside was 19!
One more question - is it correct that while the heat pump or gas furnace is in operation, both are circulating warm air into the under compartment where all of the water lines are?
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12-17-2007, 08:33 PM
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#5
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Senior Member
Join Date: Jun 2005
Location: Texas
Posts: 482
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Quote: "One more question - is it correct that while the heat pump or gas furnace is in operation, both are circulating warm air into the under compartment where all of the water lines are?"
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Nope! The heat pumps operate in the same way as in the A/C mode, as far as air circulation is concerned. There is no conditioned air into the storage or lower equipment areas from the heat pumps. Air and return air vents are in the ceilings
On our 2005 RE, the furnace return air dumps down into the lower areas. So, when the temps are at freezing, or below, the furnace does need to be running to help keep water lines, etc. from freezing (hopefully).
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Robert
Robert and Carlene
2005 RE3, S/N 2107 (sold Jan. 2010)
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12-18-2007, 07:58 AM
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#6
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Senior Member
Join Date: Aug 2005
Location: Texas
Posts: 423
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Quote:
Originally Posted by rdunk
Quote:On our 2005 RE, the furnace return air dumps down into the lower areas. So, when the temps are at freezing, or below, the furnace does need to be running to help keep water lines, etc. from freezing (hopefully).
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Or an auxiliary heat source in the basement.
We keep a little electric heater set on the 500W setting and it kept the temp in the basement at 80 when temps dipped to 28 degrees. That was with heater on one side of basement and temp. monitor on other side of basement.
In this manner we can keep an electric heater in the living area and keep it comfortable without burning propane, as stated in another post on a similar thread.
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Ron & Connie
Texas Nomads
""Love your country - - Fear your government!!""
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12-18-2007, 09:24 AM
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#7
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Senior Member
Join Date: May 2005
Posts: 2,130
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There is another consideration regarding the AC and heat pump that is a potential fire hazard. I'll be posting more on it as soon as the replacement capacitor and motor starter come in. This is the 4th failure of this type we've had and according to the techs I've talked to, rather common to both Dometic and Coleman who use the same components. There is an after market system that is far more robust than the OEM components. I'll post pix, description as well as part ID on the upgrade.
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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