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
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