Quote:
Originally Posted by homeless
I have a 2000 Itasca with basement air. Question is heat pump and gas furnace. I understand when on electric heat setting only the heat pump comes on, unless it's too cold! Sometime both work together, sometimes only gas furnace comes on, sometimes only heat pump comes on! There is no rhyme or reason in relationship to temperature outside with mine! I'm wondering if I'm have an issue I need to look at.
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There are several possible operating scenarios when the heat pump is selected to provide heat.
First of all it will only work down to the mid 30's. The exact temperature is somewhat dependent on the humidity of the outside air. General rule of thumb would be that it will operate down to about 37*F However given that it's an air to air heat exchanger it won't be very efficient near the shut off temperature.
Secondly for only the heat pump to operate the set temperature must be within 2 degrees of the ambient temperature. If the ambient temperature in the coach falls more than 2* below the set temperature the gas furnace will come on to assist. Once the temperature is within the 2* window the gas furnace will shut down and let the heat pump work solo.
If the outdoor temperature falls below the working range of the heat pump the heat pump will try to operate 3 times before the system locks it out. Then the gas furnace will take over and the heat pump will remain locked out for 1 hour and 45 minutes.
Here's a link to a publication from Winnebago explaining how and when the system works.
http://www.winnebagoind.com/resource...ditioning).pdf
At the bottom of the second page is an algorithm explaining what functions will take place under what circumstances.