Good Sam Club Open Roads Forum: Heat & A/C on at the same time!
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 > Heat & A/C on at the same time!

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Mont G&J

Missoula, MT

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Joined: 09/29/2005

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Posted: 09/18/20 08:24pm Link  |  Quote  |  Print  |  Notify Moderator

dougrainer wrote:

Mont G&J wrote:

dougrainer wrote:

Mont G&J wrote:

Perhaps it's like mine. My T-sat has a selection for 'Furnace' and in that case the furnace will come on and blow out of the lower furnace ducts. Also, I can select 'Auto' and in that case if the T-stat calls for heat the AC comes on and works as a heat pump blowing warm air out the upper AC ducts. If the trailer is warmer than the set temperature the AC blows cold air out of the same upper duct.

Sorry, not correct. AUTO does NOT turn on the Heat Pump function if you have a AC/HP upper unit. ALL AUTO does is allow the system to select the fan speeds and shut the fan OFF when temp is met. You still have to select HEAT PUMP on the wall tstat for the HP to function if you have one. If you do not have a HP display on your tstat, you do not have a HP. Doug


Doug, My AC does operate as a Heat Pump or Air Conditioner. In the 'Auto' Mode it will turn-on either function.
Below is copy and paste from owners manual.
G. “AUTO” - Auto Change Over Mode In the AUTO mode the system will automatically change the mode of operation from cool to heat or from heat to cool. In order for this mode to operate, the zone being programmed must contain either a heat pump, heat strip or furnace heating source. When in the AUTO mode, all pre-programmed operations for the heat pump, heat strip, and furnace will apply.


NOTICE it states the MODE MUST be programmed for that to happen. I will bet you have a CCC2 Dometic wall tstat. On your tstat, IF NO OPERATIONS PRE PROGRAMMED, then the system will NOT auto switch between AC and HP. So, if NO programmable Tstat(very RARE to have one), then the AC/HP will NOT switch between the 2. Doug



I'm not sure why you contiue to insist you know what I have and think I don't know. Please watch the video. Dometric Thermostat in 'Auto Mode'





down home

south

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Posted: 09/19/20 03:00am Link  |  Quote  |  Print  |  Notify Moderator

Find a good the to sort out the thermostat/controls. Our has two furnaces and two heat pumps. It is cold with the heat pumps selected , the furnaces still come on first to bring the coach up to warmth fast, then shuts off and the heat pumps take over. Our Holiday Rambler Fifth Wheel operated the same way, I believe. And when it gets so cold the heat pumps aren't able to keep up the furnaces kick back in and heat pumps go off. No way a heat pump can blow both hot and cold at the same time, unless it also has heat strip and it is wired cockamamie, with it wired on the wrong side of the thermostat/switches. Heat pumps work in both direction reversing the ac cycle on heat to extract the heat from the air outside and heat the air inside but can only work in one direction at a time.

Mont G&J

Missoula, MT

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Posted: 09/19/20 08:50am Link  |  Quote  |  Print  |  Notify Moderator

down home wrote:

Find a good the to sort out the thermostat/controls. Our has two furnaces and two heat pumps. It is cold with the heat pumps selected , the furnaces still come on first to bring the coach up to warmth fast, then shuts off and the heat pumps take over. Our Holiday Rambler Fifth Wheel operated the same way, I believe. And when it gets so cold the heat pumps aren't able to keep up the furnaces kick back in and heat pumps go off. No way a heat pump can blow both hot and cold at the same time, unless it also has heat strip and it is wired cockamamie, with it wired on the wrong side of the thermostat/switches. Heat pumps work in both direction reversing the ac cycle on heat to extract the heat from the air outside and heat the air inside but can only work in one direction at a time.


The OP said it was a new trailer to SIL and was getting heat and AC at the same time out of the overhead ducts. It seems to me the AC is running in the HP mode and the new owner doesn't understand that the air conditioner is capable of producing heat or cold depending on the mode.

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