It HOT here in SC and I was cleaning the condenser on the outside unit
yesterday. I decided to look at the pressures and see what they were...
The evaporator is inside a closet with the water coil that heats the house..
The Temp here is 95 degrees and humid, The low side is 60 pounds and the
high is 200. The low side has a little moisture on it but not much. The
drain has a steady drip drip, drip.... It runs most of the day and starts
cycling late at night and does this until mid morning....
I've done a fair amount of work on car AC, and l know what to look for on
pressures on them, but not on a home unit. I was thinking that these
pressures were on the high side. I also did replace the filter.
I haven't clean the evaporator yet because of where it at.
Any suggestions or am I OK
There are so many factors you have to consider when dealing with the
pressures, but your main problem is if you are not licensed to handle
refrigerant, you aren't supposed to be hooking up guages to an a/c unit
whether it's yours or not. That being said:
If the evaporator is dripping condensation, then it is doing SOME work, but
without knowing all the other conditions, it's hard to tell from here. It
could be undercharged, overcharged, or the TXV could be bad (if it has one),
compressor could have bad valves, coil(s) could be stopped up, fan may not
be moving enough CFMs, piston could be clogged, etc.
Bottom line: If you have not had the unit serviced in some time, it might be
a good idea to call a reliable service company to check it out. Ask your
friends and neighbors who they use.
Tough to say from a keyboard, but I don't think your pressures are high at all.
I am in SC and we usually see high side pressures higher than that on these
rather warm days on all but the super efficient systems. You really haven't
given enough info to say anything with any degree of certainty, but if it has
been a while since the unit has been serviced it might be a good idea to have
it done soon.
Thanks for the input...
I was more concerned about the low side pressure.. I'm accustomed to seeing
pressures in the 30's on cars with R-12, and the temps out of the vents in
the 30 to 40 degree range, which is what I'm set up to service.... pump,
reclaim unit, reclaim tank, gauges, oils, R-12,
digital scales.... Just haven't done the R-12 and home unit.... I've always
just kept the condenser cleaned, the fan and blower oiled and blades
cleaned, and the filters replaced. I did spray the evaporator and clean it a
couple of years ago. The unit is about 8 years old now...And that can't be
good the way things are being made these past several years.
You guys try and stay cool.
[original post is likely clipped to save bandwidth]
My first suggestion would be to be sure you have a proper EPA 609
certification. The feds take that fairly seriously and connecting gauges
requires an EPA certification.
My second suggestion is don't assume MVAC (motor vehicle) systems operate
in any way similar the HVAC (such as home) systems. They use radically
different control systems and different refrigerants.
Finally, pressures by them selves mean little (except in extremes).
Superheat or subcooling are the important metrics. Generally, this data is
supplied by the manufacturer in a chart or graph form to cover different
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