Question about Dometic Rooftop RV Air Conditioner

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Air conditioner runs approx. two minutes before shutting off. It stays off for about 12 minutes before recycling on. By this time, in south Louisiana's heat which ranges from 78 degrees at night to near 100 daytime, the camper becomes uncomfortably warm. I have a Mod. 640312.301 mounted on a 2010 R-Pod. Is there something I can do to shorten the cycling time.

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  • cruz924 Jul 02, 2009

    Kevin, thanks for your reply. However, I should have mentioned the following: (1) The A/C unit is only a week old (today). I realize that a relay can be defective, but so soon? (2) The thermostat is in the unit (not remote). I have been thinking along this line. I know that on some home window units, manufacturers clip the thermostat capillary to the cooling coils which causes the unit's compressor to cycle frequently. Can I move the thermostat capillary in the Dometic unit, away from the cooling coils?




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There should be a setting on the air con that will let you change the cycling time, if not then that means that it is working at its Full Capacity and will not be-able to do more.

Posted on Jul 02, 2009

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This could happen because of differant reasons.
Get the relay checked , commonly seen a bad bad relay can caues the same.
Make sure the filter is clean ,then check the evaporator coils(cold) to make sure air can flow through without resistance.
then check the condenser coils(hot) make sure the fins are clean and not bent.
check the location of the thermostat is cold air blowing on it because it's too near a cooling vent? if so relocate it away from drafts ,if the thermostat cools before you do you will be hot when it turns off.same in winter if the thermostat gets hot because heat blows on it ,it will knock off before the room heats.

Hope this helps
Kinldy rate the answer

Posted on Jul 02, 2009

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