Question about Dometic Rooftop RV Air Conditioner

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Our rv air cond. won't cool inside our storage bldg. we have been told the air is too hot inside the building and the air cond can't condense and cool the feron is this true or is ther another cause for this problem

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  • herndon1257 Jun 25, 2009

    our rv is a 38 ft holiday rambler, it is stored inside a 20 ft wide and 70 ft long and 18 high. We have had the air cond recharged. what do we need to do about this.

  • herndon1257 Jun 26, 2009

    are we going to get another response to our question

  • herndon1257 Jun 26, 2009

    We would like a response to our second question


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If your a/c has sufficient ways to breathe in air then it should provide cool or cold air.There is no such thing that an A/C cannot provide what's it's meant to do base on the building being hot.You need to assess your a/c very well.Is everything working as it's meant to be..Is the compressor working etc..

Posted on Jun 26, 2009

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If the space is too large and not insulated the unit will not transfer the heat out fast enough

that is assuming that the unit is installed and running properly

if it is just sitting in the room it will not cool

12,000 btus per 600 square foot 12,000 btus = 1 ton

Posted on Jun 25, 2009

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1 Answer

How many tons do I need to cool a bldg 20,000 sq. ft.

Determining the total tonnage to cool any building depends on the heat loss calculations. Points to include is the R rating of the insulation, the square footage of the windows and doors, How hot does it get in the summer? Also the materials the building is made of. ie. Steel. concrete, wood exterior walls.

Jan 26, 2015 | Heating & Cooling


Protecting electronic devices from moisture condensation

You probably already know electricity and water don’t mix. It’s especially true when that mixture happens inside your mobile phone, MP3 player, Blackberry or PDA. The tiny electronic components inside these devices can stop functioning either temporarily, or permanently, if enough moisture collects on them.

Rarely does anyone think about this, but consider a day that you spent outdoors, at the beach or amusement park. There is little doubt that you won’t have some type of electronic device in your pocket or, like some teenagers, permanently affixed to your hand and/or ear.

On days when the outside air is especially warm, your electric device’s components are going to be even warmer due to the electrical currents within. If you walk into an air-conditioned building to cool off, the device will also begin to cool. Condensation can develop on the device anytime the temperature of the air surrounding the device is altered; either by going from hot to cold, or from cold to hot. Often, condensation develops on the LCD monitor or sometimes inside camera lenses and causes water spots or fungus.

To prevent condensation from developing on your electronic device when transitioning between two different temperature zones, place the device inside a sealed plastic bag until the temperature of the device is closer to the temperature of the surrounding air. Condensation will develop on the outside of the bag, instead of on, or in, the device.

In areas of extremely high humidity, condensation may still develop. If you see that moisture is beginning to develop on the device, turn of the power for a couple of hours until the temperature of the device has reached the temperature of the surrounding air.

This is also why, in my opinion, it is best to avoid turning electronic devices (of any kind) on and off repeatedly. Not only to prevent condensation, but the expanding and contracting of electrical component due to heating and cooling causes unnecessary metal fatigue.

Happy Transphonetexting,

on Dec 02, 2009 | Cell Phones

1 Answer

The air coming from the air conditioner is not cold

First, power everything down! You will need to climb on top and remove the cover. Inside you will see the compressor, condenser grill, a contactor-relay and capacitor. Most likely it is either the capacitor or contactor-relay (70% probability) or the compressor (25%). If you see ice build up on the connections or on the condenser grill it could be that you are low on freon or have a leak in your sealed system.

If things look normal then I would go with the contactor-relay and capacitor. If things are iced up, you will need trained technician help. Most AC shops will work on it, but won't have the Dometic parts. An RV place will have the parts but you usually pay a premium price for the labor and service.

Aug 18, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Rv ac throws the breaker when outside temp gets high, unit works fine at night when outside temp cools down

Clean evap and cond coils
Place hand on a/c if too hot during the day but cool at night
then freon is being restricted in the condensor
Cleaning coils may help days
Put a trickle of water on the condensor during the day for a test.

.If this was helpful please rate me.
Leo Ponder Appliance-Tyler,Texas

Aug 07, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Not cooling

check the and see if the condenser fan is running. you will find it if you take the top off also check and see if the condenser coil is clean. if it is dirty or the fan under the top is not running it will cause the compressor to short cycle on limits or overload.

May 29, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

PART # 7330B730 SERIAL # 109734610 1997-TIMBERCREEK R.V.

most of the time the condenser coil is dirty and needs to be washed out. with it dirty the pressures are elevated and causes compressor to kick out on overload. try washing cond. coil first

Sep 12, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

Roof top A/c on a 33 1/3 foot RV. When

How long since the evaporator coils & fins, as well as condenser coils & fins have been thoroughly cleaned? Everything works harder when it can't get proper air flow. I have seen units that owners swear they cleaned well, but had no idea, they had to vacuum &/or wash down the coils way up inside the area that the return air filters are. If you take a flashlight & stand on a small ladder or something, and shine it way up to top, you'll see what I'm talking about. Even when filters are kept clean, over years, dust collects up there & add moisture to that & you get like mud clogging up those coils. If your up to it, or have someone who is, or will, going up on the roof and remove cover, I can tell you proper way to clean entire upper unit so that it has a chance of running as cool & efficient as possible. It doesn't cost anything other than some time, and a little elbow grease. Let me know.

Jul 19, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Does not heat real hot or cool real cold . dometic duotherm penguin markings on 85 or so unit

Heat real hot? Is this a heat pump or do you have a heat strip installed. Get a regular thermometer and put it in the outgoing vents of the unit. Register the temperature there and then the outside temp. If it is cooling at 17 to 23 degrees below ambient temperature, the manufacturer says this is fine. Try cleaning the condenser out on the top of the rv. Gently hose the rear condenser out until all the dirt and grime is removed the unit. Try cooling again and see if it is better.

Jul 04, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Rudd heatpump doesn't cool

Hi, Is the condenser fan running? If not, Check the circuit breaker inside the house and the quick disconnect at the condensing unit. Making sure the power is off, check for any bugs in the contactor. If it is running, check to see if there are any resets on a high pressure switch or control board in the condenser. Check the compressor capacitors and see if they are leaking oil or swelled up. are there any burned wires? Is the compressor hot? If the fan is running and the compressor is not hot it is probably off on Low Pressure and needs charged by a licensed Air Cond Tech. Hope I have helped. Let me know. kstfas

Sep 24, 2007 | Ruud Matching Split Air Conditioner

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