Question about Dometic Rooftop RV Air Conditioner

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Low Voltage My campground seems to suffer from low AC voltage. How low can the voltage go before I have to start worrying about harming the unit. I think I read somewhere 10 or 15% of rated voltage is acceptable, is this correct?

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Yes the 10% factor is correct. Anything greater than ten 10% will affect operation without question.

Posted on Jul 18, 2008

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Sounds like compressor contactor won't pull in due to the low pressure switch. You have to find where you're losing voltage. Unfortunately sounds like a refrigerant. Voltage not making it all the way to contactor. Low voltage not high voltage

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What could be causing my HVAC secondary circuit to keep blowing a fuse after the AC Compressor ran for 10 hours?


Yes its a short. I've seen a weakening component cause that but 99% of the time its a short. Look where your control enter your o.d. unit. The wires can rub on the metal where the small hole is for the wires to go through. If your o.d. unit has any low voltage wires inside where the piping to the compressor are, look there. A low or high pressure switch may be installed and the low voltage wires inside can rub on a copper line causing an intermittent short. Look anywhere a low voltage wire can touch anything , other than intended points. If its a component then you may end up with new parts all over and still have a short. The control wires can get damaged by varmits in the attic, crawl space, and where the wires go through the wall or sophet. To isolate it may take a pile of fuses or a transformer with a micro-breaker can be installed. Basically has a 3-5amp micro breaker that trips and can be reset. If you were to remove all control wires leading to the o.d. unit, start the cooling, and it shorts then your short is not at o.d. unit. With o.d. control wires wired in at the ahu, disconnect the low voltage wires from the o.d unit. Cycle cool and if it shorts, the wire between is the cause. If it don't short, then you know its at the o.d. unit. At the o.d. unit, if it has any low voltage safeties(low pressure, high pressure, delay timer, ect...) you can maybe bypass all to allow the contactor to be the only component wired in the low voltage circuit at the o.d. unit. And if it shorts keep chasing it. Bugs and geckos can get behind circuit boards causing a short. Ants in any components can cause a short. Hard to help more from here. Above all, work safe!

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1 Answer

I have a issue with my 2 Dometic DuoTherm air conditioners. The rv is a 2014 Palamuno Saber 50 amp fifthwheel. Ok. They cool very well but at different random times the compressor shuts off while the fan...


how long a power cord do you have and what size conductors are in it. when a a/c shuts down do to thermostat reaching its setting then trys to start back up shortly the pressures dont have time to equalize resulting in high amp draw. if fans runs all the time instead of shutting off with compresser it will call for cooling fast. i have a 2003 cardinal with 2 a/c's the smaller one has a continous fan & the larger one cycles fan with compressor. i have power cord rated for 50 amps. 110 to 115 is still a low vooltage condition.

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1 Answer

Rear ac unit keeps kicking off says low power the fan will run on auto soon as u kick on ac or heat it kick of and says low power front unit runs good dometic unit


Check your breakers and make sure you are getting the required voltage. Sounds like you are not getting the correct voltage to the system.

Jul 13, 2014 | Air Conditioners

4 Answers

HELP???


What was the voltage that you measured? Are the units 220 volt or 120 volt. Units that size are usually fed by 220 volts. What is the current rateing of the circuit breakers? Are they a double breaker with a handeling capacity of 20 amps or are they 15 amps.

You didn't mention if they ever worked? Are you feeding 120 volts or 220 volts to the two units?

Good luck,

Marty

May 11, 2014 | Dometic Rooftop RV Air Conditioner

1 Answer

My window AC of 1.0 ton capacity is drawing 8.4 amperes instead of 7.0 (max,).There is no abnormal sound from any where in the AC ,Voltage is full(230-VOLTS). is this may be the case of low cmpressor oil...


Is the AC cooling properly?
If it is I would not bother it.
Your amp draw while somewhat high is not significantly high and would not worry me from a trouble-shooting angle, especially if it's cooling well.
Did you read the amp draw with the cover off the AC? If you did that would account for a slightly high reading. Even if you read it with the cover on - I would not worry about it, as I said above, it's just not that significant.
As far as 'low oil level.' -- I would not even be thinking about "oil" or whether or not it was low or whatever. This is just not an issue in such a small unit.

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Look at the contactor on the condensing unit, remove the low voltage wires to the contactor and turn on the system. If the low voltage fuse doesn't blow, replace the contactor.

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1 Answer

During low voltage period window AC compressor shudders and kicks off, but fan runs, when voltage returns normal compressor runs.


low voltage issues causes higher amp draw and equipment to run a lot harder. whats causing the low voltage problem to the equipment? high amp draw of the compressor could be causing it to overheat and trip until the compressor physically cools down.

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If your outside condenser has a locked rotor or short circuit, than the unit WILL trip the breaker - as it should. On the other hand if a breaker is tripped a few times it will have less of a capacity that the rating, (this is designed in it). You will need to determine if the unit is locked (and broken) or the breaker has become too sensitive.

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Soleus kfr 18gwda


The fan blade can be purchased by calling 1-888-8soleus.

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