Leaky copeland valves???need help

[james264]

Got a walk-in refrigerator with a copeland nrb2-0400-tfc-800 box runs 33-40 degrees unit leaks back on suction side after liquid line solenid deactivates.I replaced liquid line solenoid today and in doing so noticed refrigertant coming back on suction side with valve on suction side facing piping front seated and valve after condensor front seated did not stop till I front seated compressor discharge valve .I fired unit back up after replacing liquid line valve same thing pressure rise on suction side after unit pumps down .I turned off compressor after pump down to zero psi on suction side then quickly front seated valve at compressor discharge before it goes into condensor and pressure on suction stayed at zero psi.Is compressor getting leak from high side back through compressor valves to suction side or am I missing something ???Rla are 14amps with high side at 170 psi and low side 52 psi .If it is the valves how bad of a job taking head off and replacing I have never done this before .Sorry for the essay figured more info. the better Thanks !!!!!

[engineerdave]

James -

Head jobs are easy money. Just make sure you run the mfr numbers past your supply house, get the right valve plate & gasket kit. Pump it down, bring a 7/16", 1/2", & a 9/16" and have a nice day. Merry Christmas dude!

[icemeister]

Copeland NRB2-0400-TFC valve plate kit = P/N 998-0661-58. It has all the gaskets you'll need. Get a good gasket scraper..........and a pair of gloves to save the knuckles.

[james264]

Thanks for the info. guys should I worry that the piston rings might be shot and bleeding back that way or stick to the valves ?? Or change compressor its about 7 years old .Do you guys have a rough idea what the kit is worth ??United ref. closed at noon today .Thanks!!

[rocket]

if piston rings and/or cyl walls shot, you can test for this
compare suction pressure against ***crankcase pressure
should be same or within 3 psi if more than that compressor is shot and no need for VP just new comp

***fitting on side of comp

[shaun66]

7 yr old pump, i wouldnt do valve plate , i would change pump

[james264]

O.k. in ref. to my previous post about Copeland compressor not pumping down might have to change out if test on tuesday show trouble besides valves. Just looking around for prices has anyone used the remanufactured Copelands by A1 compressor sold by RE Michel or should I stick to a new one or just do valve plate on 7 year old compressor .Thanks !!