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Old 06-28-2006, 11:23 AM   #1
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A/C question

Finally took the new toy out for the weekend. Had a great time and everything worked fine, with the possible exception of the A/C. Cooled fine but just didn't seem to remove the humidity from inside as well as I expected. A/C ran all afternoon and evening. No showers taken and we weren't in the trailer until 10:00 PM, meaning we weren't even breathing in there all afternoon and evening. Condensation dripped from the drain but still felt clammy inside. Trailer was level and parked in the shade. After I turned the unit off on Sunday there was a significant increase in the amount of water comming from the condensation drain.

Does this sound normal or should I be looking at the condensation pan to see if there is a blockage? Would a blockage result in increased humidity inside or just a leak? This is all new to me so any help would be appreciated.

Thanks

Greg
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Old 06-28-2006, 11:43 AM   #2
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A buddy of mine who is an HVAC guy told me once that the way to remove humidity is have the unit run for long periods of time (as opposed to cooling to a certain temp and shutting off for long periods). Maybe you need to turn the thermostat down a little lower so that the "on" cycles are longer?

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Old 06-28-2006, 11:51 AM   #3
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I think if the drain hose was plugged up, the water would drip out of the air conditioner and into the inside of the trailer.

See my latest problem at: http://www.airforums.com/forum...ard-23312.html

You could try shoving a piece of wire or something like it up the drain tube to unclog it. Dirt dobbers had plugged mine up.

To monitor my air conditioner, I went bought an indoor/outdoor electronic thermometer. I set it on the counter, place the outdoor probe into the cold air vent. That way I can see the temperature differential between the inside of the trailer and the cooled air comming out of the unit. It also has a relative humidity display so I can see if it is actually humid or just feels that way.

If it ran for hours on end, it should have removed a lot of water from the air. Is the unit getting cold enough to condense the water from the air?

Hope this helps.
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Old 06-28-2006, 12:03 PM   #4
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Thanks for the replies. I have one of those indoor/outdoor thermometers so guess I'll put the outdoor unit buy the A/C, turn it down real cool, let her run and see what happens.

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Greg
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Old 06-28-2006, 12:09 PM   #5
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If you have an air conditioner that has a constant running fan, you will deal with humidity problems when temperatures are not terribly hot outside. It will be especially evident at night.

The problem is humidity is only being removed from the trailer when the compressor is running. Once the compressor turns off and if the fan continues to run, the moisture that is present on the inside coils will be reintroduced back into the inside air. In the case where it is not extremely hot, short run cycles of the compressor will not allow enough humidity extraction. Noting that you were in the shade probably gives me the impression that after the initial cool down, the compressor was probably cycling, with not much heat gain in the trailer. Especially since you weren't occupying the unit for long.

My Safari had a continuous run fan, where my Classic fan cycles on and off with the call for cooling. It makes a difference in the humidity and comfort levels.

Like Jim noted, you can turn down the thermostat which will force the compressor to run longer.

On new build Safari's you can ask for the Comfort Control thermostat which will allow your heating and cooling to be controlled by the wall thermostat. In this case the fan will cycle off and on. Silvertwinkie got that installed along with a bigger A/C unit when his 25' Safari was built.

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Old 06-28-2006, 12:37 PM   #6
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Jack, what you say makes a lot of sense. I have discussed the thermostat issue with the manufacturer. Sounds like I can "upgrade" to the wall mounted unit but of course, everything comes with a price!! Also installing a
fantastic fan this weekend, maybe that will help as little as well.

Thanks for the input.

Greg
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Old 06-28-2006, 02:31 PM   #7
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Quote:
Originally Posted by ptrvr
Jack, what you say makes a lot of sense. I have discussed the thermostat issue with the manufacturer. Sounds like I can "upgrade" to the wall mounted unit but of course, everything comes with a price!! Also installing a
fantastic fan this weekend, maybe that will help as little as well.

Thanks for the input.

Greg
It's not quite as simple as upgrading the thermostat since your air conditioning controls are mounted on the air conditioner itself. The air conditioner on my Classic has no external controls and has internal circuity that runs to the thermostat. I know one person who did do this upgrade himself and it did require additional wire pulls and some other work on the air conditioner to control from a wall mounted thermostat.

That's why you really need to do this at trailer build time. I'm not sure if your dealer would tackle this kind of project....or if he does, how much it will set you back. If anything, you sort of do what we did when we had the Safari, and that is dialing down the thermostat when compressor run time dwindles. You pile lots of blankets on the bed and when you wake up in the morning you will have condensation on the outside of your windows!


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Old 06-28-2006, 04:56 PM   #8
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Yes, it is complicated and includes buying a new "lower unit" (probably not the correct description). Piling on the blankets is good for me but not so good for my cold natured wife!!! Probably just need to camp more in the cooler months and keep her in sweaters.

Greg
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Old 07-01-2006, 04:37 PM   #9
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AC Drain

Where is condensation pan so can check for blockage. Have water running down the side of my trainer from the ac.


Thanks
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Old 07-01-2006, 08:52 PM   #10
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On mine, it's directly below the coils, it then drains to a tube that runs thru the roadside wall out thru the belly on to the ground.
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Old 07-01-2006, 10:43 PM   #11
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De-Humidifier

Hope this is not too far off topic but my wife hates a/c.
We need a de-humidifier.
A/c's act as de-humidifiers but cold, anyone use de-humidifiers?

R
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Old 07-01-2006, 10:51 PM   #12
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When my a/c issues surfaced, I talked with a seemingly well informed hardware type at Home Depot about using a dehumidifier in mine. His comments were they work just like an a/c unit, except they dump the WARM dry air back in the trailer, meaning the a/c has to work harder to keep things cool. I'm so confused at this point I'm just sitting back and waiting for cooler weather as opposed to 95 degrees.

Greg
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Old 07-01-2006, 11:01 PM   #13
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A/C with Dehumidifier

Just read about air conditioners with dehumidifier options.
I believe the humidity is more uncomfortable than dry air at the same temp.
We breath and sweat out water.

R
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Old 07-02-2006, 12:21 AM   #14
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I think Jack has hit the nail on the head with his short cycling theory. The compressor cycle is so short the condensate on the fins is simply blown back out into the room when the evaporator heats up during the compressor off cycle.

I'd check to see if the unit is cycling as he suggests. If it is, the thermostat solution to cut the fan is a good one. As a stopgap, try finding a sunnier site which would force more compressor run time. Or possibly running a low power electric heater to force the compressor to run more (if power is provided free).

I have the same continuous run fan in my 25' Safari, but in the low humidity desert southwest compressor run time is continuous during the day parked in the sun. Last week in Las Vegas the compressor didn't cycle from 9 AM to 8 PM.
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