Re: [A/S] AC repair needed

In the small space of an RV the water vapor from humans, pets, cooking,
bathing and going in and out a lot and losing your cool air can cause a new
unit in perfect condition to
freeze up once temperatures get high enough it no longer cycles on the
thermostat which allows the condensate to drain off. About a 20 degree
differential with the outside temperature is about as good as you can do,
on a 97 degree day raise your thermostat to
77-79 degree range until the unit cycles once again and removes the
moisture instead of holding it. Asking the the unit for 70 degrees on a day
and situation where it is only capable of 80 is just asking it to freeze up.

Steve
Urban Camping in the Dallas Design District


On Tue, Jun 19, 2012 at 10:07 AM, Rick Kunath <k9ao@charter.net> wrote:

> **
>
>
> On 06/19/2012 09:35 AM, Anne Pearse Hocker wrote:
>
> > So....based on that info, was it a simple freeze up, and is there a
> > way to prevent it? As David has pointed out, this is a ceiling unit
> > with the switches on the ceiling, not the wall, and there is no
> > thermostat. It was an entry level Airstream in so many ways.....
>
> Is there no thermostat to make the unit cycle at all? Not even at the
> ceiling?
>
> One thing to keep in mind is that a refrigerant low-charge situation in
> the A/C unit can also make the evaporator coil freeze up. It can get so
> bad the thing becomes a solid block of ice. But if that is the case,
> usually you are going to know it because the thing is not going to be
> cooling right in hot temperatures. It'll be obvious that you know
> something is wrong, it just won't get cold enough.
>
> I don't know if there are any refrigerant fittings on that unit of yours
> at all, but if so, it may be worth having an A/C tech check them for
> leaks and adjust the refrigerant charge level if needed. The compressor
> can still very slowly leak charge around any seals where wiring leaves
> the housing. And that is not necessarily a problem if it is slow enough.
>
> Low voltage to the compressor can also cause freezing as the high
> pressure is not high enough. Not to mention that this low voltage
> problem causes the compressor motor to run hotter. Hence the good advice
> to get a voltage alarm and not run the A/C if the voltage is too low.
>
> To fix freezing on A/C units that have to run with cold ambient outdoor
> air temperatures, they have to be designed with hot gas recirculation
> built in. If it gets cold enough overnight, your typical A/C unit is
> going to likely get the evaporator too cold and freeze up.
>
> Rick Kunath
> WBCCI #3060
>
>
>


[Non-text portions of this message have been removed]



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