So to understand this more....
The evaporator may have more "vacuum" on it and the evaporation process
happens more efficiently ,due to easier evaporation, but the high pressure
side is not really affected and still the same old liquid state?
"DoN. Nichols" wrote in message
Actually -- it *does*
cause icing. The boiling point of the
refrigerant is a function of the pressure. The lower the pressure, the
lower the boiling point. With enough refrigerant, the low-side pressure
is high enough so the temperature is low enough to condense the water
out of the air, but not low enough to form ice. Let some leak out, and
the temperature dives far enough to cause icing. I've experience this
more than once in the house AC (real refrigative AC, not Gunner's swamp
cooler, which does not work around here).
If you have a gauge set, look at the low side gauge, and you
will see a separate temperature scale for two or more refrigerants.
Mine has them for R-22 and R-134a.
R-22 reaches freezing (32 F) at something like 5" Hg (above
atmospheric pressure), while R-134a reaches the same temperature at a
more extreme vacuum of 35" Hg above atmospheric pressure.
The high side associates 32 F with about 50 PSI for R-22 and
R-134a appears to be off scale for 32 F.
However, when it comes to recharging the dehumidifer, look it
getting refrigerant and a gauge set. At least the one
which I have has no connection ports and valves for the manifold hoses.
What it appears to have is crimp-off seals on the end of copper tubing.
I've seen the tool for making those -- but don't have one of my own. It
squeezes the copper tubing in two places -- one to make a seal, and
another to squish through the copper and part the original tube off. To
recharge something like this, you would probably need to cut the tubing
off below the crimp, braze some more tubing on to give enough length to
repeat the crimp-seal when you get enough refrigerant in the system.
(Or perhaps, braze on some good valves so you can recharge it again in
the future.) Oh yes -- you would also need a serious vacuum pump to
clean out the system of air and moisture once it has been opened to the
And -- you need to be able to *get*
the refrigerant. Getting
R-22 is rather difficult without a license these days. :-)
The current outside humidity is about 67%,and the inside
humidity at 40%. About 8:00 this morning, it was about 93%.
And yes -- a swamp cooler can really freeze you out if the
humidity is low enough. I grew up in South Texas and had plenty of
experience with that. But here (too close to Washington DC) the
summertime humidity is high enough so you can't buy a swamp cooler, and
can't find an AC repairman who has even seen one most of the time.
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