View Full Version : Compressor Problem
jakb21599
14-03-2012, 01:01 AM
I have a semi-hermatic compressor that when valved off it will not pull into a vacuum. If you cut the compressor off, the low side will jump up to what ever the pressure is on the high side with in less than a minute.The dairy case is keeping temperature but i can not get the SC and SH right on it, and it has higher than normal head pressure for 404A . Would it not pulling a vacuum when you valve it off cause SH and SC issues ? What other problems would it cause ? Thanks for your help
chemi-cool
14-03-2012, 05:15 AM
Broken valve.
You will need to repair it or replace it.
Sandro Baptista
14-03-2012, 10:41 AM
Replace the valve plate
jakb21599
14-03-2012, 12:11 PM
Would the broken valve affect the SH and SC ? Would it affect the low and high side pressures ?
Sandro Baptista
14-03-2012, 01:15 PM
SH does means superheating?
SC does means??...subcooling??
Sandro Baptista
14-03-2012, 01:19 PM
"Would it affect the low and high side pressures ? "
Yes, since it promotes an equalizing tendency (due to internal by-pass). As consequence the low pressure tends to be higher (so the evaporating temperature will be higher » less capacity to the evaporator). Also the discharge superheating will be higher since the suction gas will be more superheated.
jakb21599
14-03-2012, 02:03 PM
SH does means superheating?
SC does means??...subcooling??
Yes SH - superheat. SC - subcooling
Sandro Baptista
14-03-2012, 02:27 PM
yes, my opinion is that superheated is affected. About the subcooling I can see a direct reason to be affected.
Sandro Baptista
14-03-2012, 02:27 PM
I meant the non useful superheated tends to be higher.
padraic
14-03-2012, 10:17 PM
valve plates..!
THE DUDE
08-04-2012, 11:46 PM
Pull the head, there may be more damage than expected....but most likley just a Valve Plate.
mark957
09-04-2012, 10:49 AM
hello
if the oil pressure is good, it is convenient to replace the valve plates.
hello and good luck.
aramis
09-04-2012, 09:12 PM
Broken valves reduce compressor capacity and you cannot adjust well because the components behave as if they were oversized.
D.D.KORANNE
10-04-2012, 11:20 AM
Valve plate gaskets might have blown off .........in any case head will have to opened to check valve reeds / plates .......
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