Question about Dometic Rooftop RV Air Conditioner

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Reversing vavle is not switching. rooft top dometic ac w/ heat pump ac is heat pump , heat pump is heat pump, everything is heat pump .any help?

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Try lightly tapping the reversing valve in heat and cool mode. If the problem still exist replace reversing valve

Posted on Sep 03, 2010

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AS I SAID BEFORE my problem is not ac connection its the 2 blue ,,2yellow and one red and one black..where to connection these color wires..coming out from the roof top unit. My unit is Dometic Penguin...


Unfortunately I have no access to any previous information you received from other experts, but I will tell you that without knowing which ceiling assembly/control box, thermostat etc., that you are using, the most I can do is tell you this.
Blue wire is for the compressor circuit.
Black wire is for high fan .
Yellow wire is not used, unless for heat pump circuit reversing valve.
Red wire is for low fan.
White is the common AC connection.
Green/yellow striped is for ground to chassis.

Jun 08, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

RV Dometic Duo Therm roof top AC w/heat pump Model #630515.321El Serial #21631212 Yr. 2003. It is the rear unit, front unit working fine. In AC mode it is blowing hot air as if the heat pump is on. Fan...


If the Air comeing out is the same as the temp inside the RV make sure the compressor is running and not just the fans. It could be low on freon. If freon is ok then you would need to ck the wiring to the selector switch for a short. It would be obviouse because there will be melted wires. I am leaning toword low on freon since you have already been inside the wiring/control unit.

Aug 08, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

How difficult / expensive is it to install a heat strip in a Dometic roof top AC? The unit I have has a mark on the knob for heat, but I suspect it was never installed.


Fairly easy. The only thing that you must figure out is how many amps the heat strips will draw. Make sure the fuses and the breaker switch can handle them. And be aware your electric bills will shoot up.

Oct 20, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Can somebody help,why is my Central AC blows


Most heat pumps have an auxillary heat. Many are electric auxillary heat with a heat strip in the air handler. A common malfunction is for the electric auxillary heat to operate when the heat pump is set on cool. To confirm this, locate the conductor that runs from the heat sequencer to the connection on the heat strip. You will see this on the top section of the air handler. Use the clamp on part of the amp meter over that wire. If the thermostat is set on cool and the heat strip is drawing amps, it means the heat is coming on while the heat pump is set on cool. There is usually one or two causes for this, either the sequencer is bad or there is low voltage wires usually behind the thermostat or in the air handler closet that are touching that shouldn't be touching.

If this is not the case, if its not a problem of where the heat is coming on with the air conditioner, it could be a case of the reversing valve malfunctioning. The way a heat pump works is it reverses the flow of the refridgerant. For instance, many heat pumps the reversing valve is activated in cool. That would mean that there is a low voltage circuit that activates the reversing valve when the heat pump is in cool. I'm not sure what model/brand your heat pump is, Goodman and Janitrol for instance, the heat pump reversing valve is activated in cool. In any case, if the reversing valve is not operating properly, when the air conditioning is set to cool it will actually be heating. Or you could set it to heat and it may actually be cooling instead of heating. Please check these two items first and if you have any further questions, please let me know. Especially if you know of any additional problems like the evaporater is icing up or if the air handler fan is not operating when it should.

Aug 31, 2009 | Heating & Cooling

1 Answer

A/C starts, goes immediately to heat


Unfortunately, your rear unit is calling for heat. If you put the rear unit on heat pump mode, does it then cool?
moz-screenshot-2.jpgmoz-screenshot-3.jpgThe reversing valve is energized in the cool mode of these AC's. So there is no real way to bypass it. I would check the thermostat and the control board in the unit to make sure that the switches are set correctly.

In the service manual section of the dometic/Rooftop RV Air Conditioner section. I have posted service manuals for the Heat Pump and the Comfort Control.

Hope this helps,

Jeff

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Jul 06, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

FAN SHUTS OFF BUT COMPRESSOR KEEPS RUNNING - 6 MONTHS OLD


Depending upon the model of your air conditioner, this may be normal operation.

My newer Dometic air conditioner will run the compressor in a "reverse" mode without the fan occasionally in order to heat the coils. This is done to defrost the coils. After the frost is gone, the fan switches back on and everything goes back to normal.

Jun 30, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Heat Pump and fan work fine, but will not blow cold air on AC setting


The reversing valve coil may be bad or no power to it during cool. Most heatpumps are set to have the coil of the reversing valve energize in the cool mode. The heating mode is the fail safe mode if the rev valve fails to energize. Check this and let me know.

Jun 18, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Fujitsu fujitsu ast24bbj not heating


faulty reversing vavle.get a quilfied a/c tech to come a look at the reversing vavle.and tell him to replace the compressor when he does come.im a quilfied a/c tech and i have done heaps of fujitsu and thay are common for this problem.

Jun 09, 2009 | Heating & Cooling

1 Answer

Dometic ac/heat pump


Would suggest it is drawing excessive current, make sure both fans are going, (inside will cycle low/high), or possible faulty reversing valve solenoid, or could be as simple as loose wire connection, how long does it run for and is it on the same 20amp breaker as the rear?if so start by running only the front unit in cooling 15/20min, check fans running, no unusual bearing noises, switch off for 60 sec then back on heat mode, if unit runs without stopping rewire onto separate circuit, if inside fan not working on heat check bi-metal switch in the airway, if running for a while, fans going but not very warm, check reversing valve.
Note, electrical's should be tested by someone who are qualified in the field.

Nov 05, 2008 | Dometic Rooftop RV Air Conditioner

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