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Old 05-03-2014, 10:48 PM   #11
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My 14 has two 15k heat pumps but I special ordered it that way, with that being said, I've used them in temps in the low 30's to high 20's and they both continued to work.

Jason
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Old 05-03-2014, 11:46 PM   #12
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How cold is it outside? Heat pumps are only good in these RV prob down to 35ish. It may work off an outdoor air temp sensor and below a set point auto switch to gas furnace. Just a thought. Or this could be the case and you have a faulty sensor thinking it's lower than it is and trying to switch to propane
You may be right..... I WAS in the coldest environment I've been in since buying the coach. I will have to study up though, I did not think the whole heating system (thermo, furnace, HP) was that "smart".

Boowho??
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Old 05-04-2014, 06:42 AM   #13
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The heat pumps really can't keep up by themselves when it's 30 degrees or below outside. At this point they start staging up the electric heat strips. You may or may not have that so in your case I'm thinking it switched over to propane. This is how my home system is and I really don't know if this is your setup, just sharing my thoughts. Goodluck
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Old 05-04-2014, 09:53 AM   #14
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When I have used the heat pump in temps below about 40 it would after a while freeze up (I think) and when that happened, they compressor would cycle off until it defrosted, and then cycle back on. The gas furnace never came on by itself. It only goes on when I switch the thermostat to furnace.
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Old 05-04-2014, 10:39 AM   #15
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Same experience as Tmmar. I have found anything below 44 degrees, the heat pump doesn't put out heat and laborers.
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Old 05-04-2014, 10:43 AM   #16
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Todouble is correct, when your condenser coil freezes and gets ice on it either you have a sensor on it or you have a board inside that will put it in defrost either every 30, 60 0r 90 minutes. If you do not have heat strips then it should bring on your propane furnace during the defrost cycle. The compressor will not shut off your reversing valve will switch the flow of freon to A/C but will shut off your condenser fan motor. That whats defrost the coil. I don't know what stat you have but if it has a emergency heat switch on it, that also will bring on your propane furnace. If it is working right you should see a puff of steam outside when it switches back and your Condenser fan comes back on in heat mode. Thats pretty much the basics on how they are supposed to operate. You will still feel cold air at the ceiling registers but the furnace should compensate that.
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Old 05-04-2014, 01:03 PM   #17
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gljurczyk,
The a/c's that are installed in our coaches do not have heat strips in them and the furnace does not come on during the defrost cycle. Also, the thermostat does not have an emergency heat switch. There is defrost sensor in the a/c that handles the defrosting when it ices up. This is my second Berkshire so I am very familiar with the operation of the a/c's.
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Old 05-04-2014, 01:38 PM   #18
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gljurczyk,
The a/c's that are installed in our coaches do not have heat strips in them and the furnace does not come on during the defrost cycle. Also, the thermostat does not have an emergency heat switch. There is defrost sensor in the a/c that handles the defrosting when it ices up This is my second Berkshire so I am very familiar with the operation of the a/c's.
Didn't mean to ruin your day, I glad you know what the problem is then. I'm also sure you know how to trace the short. Have a nice day, hope you get it working.I was suggesting this to BOOWHO the OP, or by the way the compressor doesn't shut off during defrost mode.not quite sure what would defrost the Condenser coil if the the compressor shuts off and didn't reverse to cooling cycle as I stated. But I guess anything is possible.....
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Old 05-04-2014, 02:41 PM   #19
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Boowho, If I were you I would be asking why during defrost mode your unit is not switching over to LP Furnace during your defrost cycle as tmmar has said. If you read up on the RV forum they all have auto switch over. A different stat can do that once you go into defrost. The question is why FR sets up there MH this way. they also have lock outs that are settable to say that you might not be comfortable at 35 degrees outside compared to 40 degrees lock out. To me 35 degrees ambient air temp you will not get more then 60/ 65 degree air coming into the unit. To me that is a cold draft. Hope you get your problem fixed. But just think soon you will have all summer to work on your problem good luck and happy travels.
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Old 10-03-2014, 03:06 PM   #20
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Exclamation furnace and a/c mix up?? Please help before winter cold comes!

The overhead fans in my trailer continue to blow cold air after the lower ones have stopped blowing hot air. The thermostat is set to furnace at 60 degrees.
The trailer is almost a year old and this phenomenon started in September when I turned the temperature up to 60 expecting the system to kick on and heat the place up and then stop after the temperature had been reached.

Any ideas where to begin looking for what's wrong? Is there a sensor somewhere I need to clean?
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