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Old 09-16-2021, 07:05 AM   #1
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Dueling Heaters!

My RVComfort.HP thermostat has started turning on both the Electric Heat and the Gas heat when we choose the Electric Heat. When we choose the Gas Heat that is all that turns on.
Considering it is a 2013 coach and we've been full timing 2 years, might be time to replace but have enjoyed repairing these small problems.
Any thoughts?Click image for larger version

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Old 09-16-2021, 07:16 AM   #2
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That's perfectly normal. When you select electric heat and the set temp is more than 4 degrees different than the ambient, the gas furnace comes on at the same time. It's designed that way to assist the heat pump or electric strip heat.
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Old 09-16-2021, 02:38 PM   #3
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Appreciate the info. Not listed anywhere in Owners Manual!
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Old 09-16-2021, 03:30 PM   #4
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Quote:
Originally Posted by Tallcamper View Post
My RVComfort.HP thermostat has started turning on both the Electric Heat and the Gas heat when we choose the Electric Heat. When we choose the Gas Heat that is all that turns on.
Considering it is a 2013 coach and we've been full timing 2 years, might be time to replace but have enjoyed repairing these small problems.
Any thoughts?Attachment 343243

That means the system is working correctly. If the requested temperature is greater than 5 degrees from the actual temperature they system will turn on both the Heat Pump (AC) and the actual Heater. After the system reaches temperature it will revert to Electric Only(Heat Pump) as long as the temperature inside can be maintained and the outside is not too cold for the Heat Pump to work.

Do you have the bag with the Owners manuals in there??? Read them, they will help understand the basic operations of all the system in the MH. If yo don't have it, you can go to the Winnebago site and down load all of them, sometimes.

While there also down load all the wireing , piping, and other stuff schematics.
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Old 09-17-2021, 02:28 AM   #5
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Quote:
Originally Posted by Tallcamper View Post
Appreciate the info. Not listed anywhere in Owners Manual!
Yes, above reply is correct.

To avoid the use of the propane heater when we select the Electric Heat Option (Really just a heat exchanger from the AC Compressors) , I just select a desired temperature that is only 3 degrees above the Room Temp.
After the Room temp has gone up a couple of degrees, I manually 'Bump Up' the desired Room temp a few more degrees and the electric heat continues without activating the Propane Heater.

Hope this helps.
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Old 09-17-2021, 11:26 AM   #6
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Here's a quote from section 10, page 11 of the 2013 Sunstar Operators Manual:

HEAT PUMP
–If Equipped
Your coach may be equipped with an air
source Heat Pump built into the air conditioning
system. Because the Heat Pump operates on
electricity, it provides economical heat inside
your coach and helps reduce the use of propane
gas for heating in cooler weather.
A Heat Pump can be thought of as an air
conditioner running in reverse. An air
conditioner absorbs heat from the air on the
inside of the coach and moves it to the outside.
The Heat Pump does exactly the opposite. Even
cold air contains some heat, so a Heat Pump will
extract heat from the outside air on a cold day and
carry it to the inside of the coach to maintain a
comfortable temperature.
The efficiency of a Heat Pump decreases as
the outdoor air temperature drops, so
supplementary heat is often needed when the
outside temperature nears freezing. This system
is set to automatically start the propane furnace to
assist the Heat Pump if room temperature cools to
five degrees or more below the thermostat set
temperature.
You may wish to manually switch
to furnace heat to maintain a higher temperature
when outside temperatures begin to reduce the
efficiency of the Heat Pump. The Heat Pump will
not operate when the outside temperature falls
below 36 degrees F.
To Operate the Heat Pump
Refer to the manufacturer’s user guide
provided in your InfoCase for complete operating
instructions.

This section mentions that the heat pump will not operate below 36*F. What it doesn't tell you is that it will try to operate 3 times. If the coils freeze over it will stop. Then the heat pump will be locked out and only propane heat will be available until such time that the entire system is shut off and it resets itself.

Also don't take the 36*F temperature as the gospel. Some will operate down to 34*F while others cut out as high as 40*F. Each system is slightly different.
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Old 09-17-2021, 12:12 PM   #7
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Quote:
Originally Posted by Hikerdogs View Post
Here's a quote from section 10, page 11 of the 2013 Sunstar Operators Manual:

HEAT PUMP
–If Equipped
Your coach may be equipped with an air
source Heat Pump built into the air conditioning
system. Because the Heat Pump operates on
electricity, it provides economical heat inside
your coach and helps reduce the use of propane
gas for heating in cooler weather.
A Heat Pump can be thought of as an air
conditioner running in reverse. An air
conditioner absorbs heat from the air on the
inside of the coach and moves it to the outside.
The Heat Pump does exactly the opposite. Even
cold air contains some heat, so a Heat Pump will
extract heat from the outside air on a cold day and
carry it to the inside of the coach to maintain a
comfortable temperature.
The efficiency of a Heat Pump decreases as
the outdoor air temperature drops, so
supplementary heat is often needed when the
outside temperature nears freezing. This system
is set to automatically start the propane furnace to
assist the Heat Pump if room temperature cools to
five degrees or more below the thermostat set
temperature.
You may wish to manually switch
to furnace heat to maintain a higher temperature
when outside temperatures begin to reduce the
efficiency of the Heat Pump. The Heat Pump will
not operate when the outside temperature falls
below 36 degrees F.
To Operate the Heat Pump
Refer to the manufacturer’s user guide
provided in your InfoCase for complete operating
instructions.

This section mentions that the heat pump will not operate below 36*F. What it doesn't tell you is that it will try to operate 3 times. If the coils freeze over it will stop. Then the heat pump will be locked out and only propane heat will be available until such time that the entire system is shut off and it resets itself.

Also don't take the 36*F temperature as the gospel. Some will operate down to 34*F while others cut out as high as 40*F. Each system is slightly different.

Thank you, Thank you , Thank you.
This is why I always tell everyone to read the "Owners Manual" the same thing with new cars. Did you read the Owners Manual, first?
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Old 09-17-2021, 12:45 PM   #8
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I didn't mean my reply to be condescending in any way. I was merely trying to provide information. Many times these manuals are written by people who are infinitely familiar with the systems and jargon of a particular industry or subject. They often forget the information is being used by people that are not immersed in the jargon and don't use the systems on a daily basis.

Without some insight on the subject it would be difficult to translate the electric heat system to a "heat pump".

One of my responsibilities for the company I worked for was to create maintenance and operators manuals for inhouse built processing and packaging machinery. A manual that might sound old hat and be thoroughly understood by a person who designed the system would be of no value to someone who has never seen it before.

You'd be shocked how poorly some manuals are written. Even with the best intentions the person writing it can totally overlook the fact that they already know the machine so intimately that they leave out vast quantities of information necessary to someone who's never seen it before. Or speak in technical jargon that would confuse anyone but the designer.

One test before publishing a manual was to hand it to a technician or operator who had never seen the machine and ask them to follow the written instructions as to how to complete a given task. Often times it took longer to edit the information into understandable terms than it did to compile it in the first place.
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Old 09-17-2021, 07:35 PM   #9
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Quote:
Originally Posted by Tallcamper View Post
Appreciate the info. Not listed anywhere in Owners Manual!
It is in the thermostat instructions. There is a sequence of operation explained.

Ken
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Old 09-21-2021, 04:48 PM   #10
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Quote:
Originally Posted by Tallcamper View Post
My RVComfort.HP thermostat has started turning on both the Electric Heat and the Gas heat when we choose the Electric Heat. When we choose the Gas Heat that is all that turns on.
Considering it is a 2013 coach and we've been full timing 2 years, might be time to replace but have enjoyed repairing these small problems.
Any thoughts?Attachment 343243

It has been my experience that setting the t-stat 3* above ambient will only start the electric when selected. If you go 4* over both gas and electric will start.


You have been full time for 2 years. I don't understand how this could be a new discovery to you.


Try this. Turn the system off. Remove the t-stat cover. It pops off with a little effort. Remove the fuse. Wait about 10 min and put the fuse back in. This is one way to reset the t-stat program. See if you still have the problem when bumping up the temp a deg or 2 over room temp.
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