[DML] Re: AC system compressor doesn't cycle, high discharge pressure
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[DML] Re: AC system compressor doesn't cycle, high discharge pressure



I mentioned adjusting the pressure switch only because it could be way
out-of-adjustment. If it is screwed up so that it never opens then the
coil will frost over and the pressure will go higher and higher on the
low side. The low pressure switch OPENS when the pressure gets too
low. If the switch is adjusted too high so it never opens the evap
coil will freeze up. Maybe the switch is bad and never opens? He said
he replaced the switch so we don't know if it works or is adjusted
correctly. Anyway adjusting the low pressure switch is no big deal.
The BIG deal is knowing you got ALL the air out and the CORRECT amount
of refrigerent in. ANY air or the wrong amount of refrigerent and you
CANNOT properly adjust the low pressure switch and the system will not
cycle. 
David Teitelbaum
vin 10757



--- In dmcnews@xxxxxxxxxxxxxxx, "Tom" <tomciodmc@xxxx> wrote:
> From: "David Teitelbaum"
> <SNIP>You could also have a low presure
> switch way out of adjustment. The compressor MUST cycle. Try adjusting
> it. It is the screw in between <SNIP>
> 
> NO NO NO, Do not touch the switch!! C'mon David... If the pressure
is too 
> high on the low side then the switch will not activate. The switch
doesn't 
> control the pressure, it's the other way around. The switch should
disengage 
> the compressor when the low side pressure drops to between 29 and
35. When 
> the pressure stays above 50 the switch will have nothing to do with it.
[moderator snip]




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