Nov-10-2017 08:29 PM
Nov-12-2017 07:53 AM
GREGORYJ wrote:
Our residential Heat Pump operates in lower outside temperatures than the our RV's Heat Pump because the residential unit has a Defrost Mode. When the outside humidity is higher and with cool outdoor temps, the outside heat ex changer can frost over. The residential unit periodically goes into defrost mode to melt the frost off, then continues to operate in lower outside temps like 20 degrees. Our RV Heat Pump does not have this feature, so when the outside heat ex changer frosts over, it stops and the gas furnace cuts in. If I go outside and look, the heat ex changer is covered with white frost. With low outside humidity it can work in colder temps which could vary from above or below freezing outside temps.
Also in Electric Heat mode, if I turn up the RV thermostat more the 4 degrees above the room temperature, the thermostat will run the gas furnace instead, by design, because the furnace will heat the RV faster. If I want to use electric Heat Pump heating only, I will up the thermostat setting 4 degree at a time till the desired temp is reached. This may not be how your system works, but this is common for basement Coleman Heat Pumps.
That is a design feature of RVP (Coleman) AC/HP systems. Coleman believes that it will take too long to heat up an RV by HP ONLY with a greater than 5 degree split. Once the RV gets below the 5 degree split, the furnace shuts off and the HP will continue the final complete heat cycle. Doug
Nov-11-2017 08:52 PM
Nov-11-2017 03:40 PM
Nov-11-2017 03:16 PM
Bill.Satellite wrote:
I may have missed someone mentioning this but if these are roof mounted A/C / Heat Pump units they will not keep the wet bay warm anyway. You must run propane heat to get warm air down there.
Nov-11-2017 03:08 PM
Nov-11-2017 02:28 PM
Nov-11-2017 02:04 PM
Nov-11-2017 11:17 AM
dougrainer wrote:georgelesley wrote:
Our furnace will also come on to help the HP if you select a temp increase of 5 deg or more from ambient. HP shuts off completely at 36 deg and furnace from there.
That is a design feature of RVP (Coleman) AC/HP systems. Coleman believes that it will take too long to heat up an RV by HP ONLY with a greater than 5 degree split. Once the RV gets below the 5 degree split, the furnace shuts off and the HP will continue the final complete heat cycle. Doug
Nov-11-2017 10:53 AM
dougrainer wrote:
BUMPYROAD.
THIS IS AN RV FORUM. IT IS RIDICOLOUS TO BRING UP TOPICS AND SYSTEMS THAT ARE NOT RV RELATED. WHO CARES WHAT YOU HAVE DONE ON YOUR HOME SYSTEMS????? Doug
PS I was 22 forty years ago. 33 years ago in Texas I HAD a HP system in my new house and since there was NO Natural gas in my new Neighborhood, I had the 220 electric back up system and until the outside temps were below 28 degrees that HP kept my 2000 sq ft house very comfortable. Yes we had sub 35 degree temps all the time in winter. Also, I doubt anyone on this forum has 20 years of repairing, installing and troubleshooting and fixing RV HP's as me. I KNOW the parameters and what they can do on RV's.
Nov-11-2017 08:57 AM
Nov-11-2017 07:06 AM
georgelesley wrote:
Our furnace will also come on to help the HP if you select a temp increase of 5 deg or more from ambient. HP shuts off completely at 36 deg and furnace from there.
Nov-11-2017 07:03 AM
Nov-11-2017 07:01 AM
Monkeyman_and_Lady wrote:dougrainer wrote:
4. LAST, IF people would READ the Dometic operating instructions that come with the RV, this would be explained in detail.Doug
I've been reading. Believe me. The amount of data that came with the new coach had me wondering if I was trying to digest an encyclopedia.
Thanks for the data, though. It all makes more sense now. Espc why the bedroom gets very warm when the furnace is running. The only return for the furnace is in the bedroom, so it naturally gets more air. Will discuss that particular design flaw with Newmar on Monday. Maybe I missed some return in the main living area.
Nov-11-2017 06:53 AM
dougrainer wrote:
4. LAST, IF people would READ the Dometic operating instructions that come with the RV, this would be explained in detail.Doug