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Old 09-24-2015, 07:27 AM   #1
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Trying to Figure Out the Heat Pump(s)

We just got a 2003 Dolphin LX 6342 with the dual zone thermostat. Although we've had other RVs with roof air (one with a heating element), they only had one unit. This is the first RV we've had with dual roof airs. When trying to figure out how to work the thing, I tried the 'heat pump' setting. There didn't appear to be a way to run both zones separately. I got heat out of the rear unit and cold air out of the front one. There didn't seem to be a way to run just the rear one or make the front one blow heat although the zones were both set higher than the inside temperature.

So, is there a faulty heating element in the front unit or is the rear one the only one with heat? If there's only heat available in the rear one, how do you stop the front one from blowing cold air while heating the rear?

Thanks for any information that will help me figure this out.
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Old 09-25-2015, 07:36 PM   #2
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As you probably know, a heat pump is just running the air conditioner 'in reverse'. Instead of taking the heat from inside the RV and pumping it out to the rooftop condenser, a heat pump takes the heat energy out of the outside air and sends it into the RV. They have to work harder as the outside air gets colder, most do little after the temperature drops to ~35-40º F. The moving air coming out of the vents might not feel hot, put if you put a thermometer in the air flow you might discover it is a few degrees warmer than the inside air temperature.

Heating coils are often installed in rooftop A/C units that don't have the capability to 'run in reverse' as a heat pump does. The heating coils can also be a part of a heat pump's auxiliary or emergency heat when outside temperatures are too low for efficient heat pump operation.

You didn't mention what brand and model of thermostat(s) you have, if you look them up on a Google search with the word 'manual' you might find a PDF file that can answer your questions. Same with the A/C units, look them up and find out their capabilities.
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Old 09-25-2015, 10:33 PM   #3
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Thanks for the suggestion. I'll do a search for a .pdf manual online. That should clarify how it should work and from that, I can determine if it works correctly.
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Old 09-25-2015, 11:39 PM   #4
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If you have the Domestic 4 button comfort control you can control each zone separate. I upgraded to the 5 button control so much nicer to operate. My two AC's not heat pumps, have heat strip in them. I have the manual for the 4 bottom control can't upload it here because it is over 3 mb file. If you would like to have it send me a PM with your email.
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Old 09-26-2015, 12:15 AM   #5
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Here's the users guide for the old 4 button control.
You didn't mention if you got the rear air to operate OR if you were on 50 amp service while doing your testing.

EDIT: The answer may be on the roof , the units themselves, you may have to pull the cover to check to see if both are original to the coach, ( there should be a build date on both) The reason you're having problems could be that one may not be capable of being controlled by the wall control. Or if the unit was replaced , it may not have been wired correctly.
Attached Files
File Type: pdf Comfort control 1.pdf (1.09 MB, 35 views)
File Type: pdf Comfort control 2.pdf (1.30 MB, 31 views)
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Old 09-26-2015, 08:48 AM   #6
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The manual I have is the Diagnostic Service Manual that includes the operation of the thermostat, setting up the control box in each AC and troubleshooting guide. That's the reason it is 3.68 mb.
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Old 09-26-2015, 10:59 PM   #7
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Thanks, Skip and Chuck.

Using the generator I got the air to work fine in both zones. I just was unable to get the 'heat pump' function (most likely heating elements) to work on the front unit. No 50 amp service here at the house.

I found the paper manual for the control. It's a 5-button control. Today I figured out more about how it works. All I need to master is the 'heat pump' mode. It was too hot today to do that so I'll have to get to it before things heat up for the day. Hard to do tonight since I have to run the generator and don't want to bother the neighbors.
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Old 09-27-2015, 11:32 AM   #8
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Be sure you have the fans on both units set to Auto. Otherwise they run continuously when the units have power to them.
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Old 09-27-2015, 06:58 PM   #9
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OK, the answer was so simple, it was comical.

It would seem that if you change zone 2 to 'heat pump' mode, zone 1 doesn't change with it. Operator error! bThat's why one blew hot and the other cold.

And hast thou slain the jabberwock?
Come to my arms my beamish boy!
Oh frabjous day! Callooh! Callay!
He chortled in his joy.

Thanks to everyone for the helpful replies.
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