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Old 05-27-2013, 07:05 PM   #1
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A/C acting funny

New 2013 Voltage 3950 with 2 A/C units. We did our first hot weather camping trip here in Florida this weekend and our front A/C unit in the bedroom was dripping a small amount of water. Just a few drops every so often. It was in the mid 90's and very humid. We had all the doors, vents windows closed and the bigger A/C in the main area was fine. It was not the drain pan as I climbed on the roof and the front unit was draining a steady trickle of water off the roof like it is supposed too. I pulled the plastic cover off the interior and found the water seemed to be coming from the supply (cold) side and collecting on the metal mounting plate that was ice cold. It seems like this was forming condensation but is that normal? When I ran the fan on high instead of auto, suggested by a service tech at my dealer, everything did dry up but is it really normal to have to run the fan on high all the time? The main unit runs just fine on "Auto Fan". Also when the afternoon sun was hitting the trailer, with both A/C units running we could only get the trailer down to 75. Outside was 95 with about 70% humidity. Is this normal?
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Old 05-27-2013, 07:13 PM   #2
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very comon in humid regions, the target temp differential between outside and inside with AC running is about 20 degrees. The about all you will get.
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Old 05-27-2013, 07:22 PM   #3
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There is a basic design difference between an automobile or pickup truck A/C and ones for motor homes, large trailers, and residential homes & apartments. The Automotive units are very large capacity in relation to the volume to be cooled. This is because people expect to be able to cool down quickly on short trips. When cooling a much larger space, it would be quite expensive to install and require a very large electrical supply to match auto performance.

In an RV application, you must use the A/C like you do in your home: Do not wait until the temps and humidity are already high before switching on, but start earlier so that the system is not overwhelmed by the heat and humidity.

I usually switch ours on at about 78-80 degrees, with the thermostat set for 72-74.

I would not be surprised that if you use this scheme, the dripping will stop.
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Old 05-27-2013, 08:24 PM   #4
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Originally Posted by chief02 View Post
very common in humid regions, the target temp differential between outside and inside with AC running is about 20 degrees. The about all you will get.
The 20 degF is between the inlet air to the A/C unit and the outlet air when operating on high fan.

In humid conditions run the fans on high. Also turn the units a bit warmer and let them cycle off.

Also tell the A/C to STOP acting Funny and get serious with its job of cooling.

Ken
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Old 05-27-2013, 08:31 PM   #5
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The 20 degF is between the inlet air to the A/C unit and the outlet air when operating on high fan.

In humid conditions run the fans on high. Also turn the units a bit warmer and let them cycle off.

Also tell the A/C to STOP acting Funny and get serious with its job of cooling.

Ken
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