A Walk-in Freezer I installed back in '99 quit on me about 3 weeks ago on a Saturday nite. The remote can compressor was running, but the suction was high @ 50 psig and the head @ 150 psig and it had a whooshing noise while running.
O.K. no big deal. Order a compressor Next Day Air on Monday. Install it on Tuesday. Install went O.K. changed the contactor & LLFD, Start-up O.K. but the pumpdown seemed slow when I checked the L.P.control setting using the King valve. The compressor pumped down fine when the LLSV was de-energized. Well, O.K. I guess it will be allright.
Now for the past 3 days the internal thermal overload is tripping, WTF???
This Can Compressor is whooping my A$$. What did I miss ? I baby sat this thing for a couple of hours this evening trying to keep it running. Here is what I saw...... after an icebath. This is a Copeland m# CS27K3E TF5 with R-404A
WIF @ + 30 F ; Outdoor ambient 75 F ; suction @ 30 psig ; Liquid @ 195 psig
after 30 minutes of running 47 F @ suction line on compressor; 79 F liquid line @ outlet of condenser. Sight glass clear. 208-211 volts @ compressor average amps per leg 10.5-11.2 ; 266 F discharge line temp. and a crankcase temp of 311 F
A little hot huh?
Check the pumpdown @ king valve, very slow. Closed off the suction service valve and it didn't go into a vacuum promptly.
Well, I throttled the suction down to 20 psig and the liquid went to 180 psig.
suction line temp still @ 47 F amp draw now @ 8.4 - 9.0 per leg.
Discharge is now @ 216 F but now crankcase temp @ 330 F WOW ! Yea, I know mass flow rate ain't happening but when I leave the suction open it will go off again on thermal O.L. Maybe this will help??
Of course my distributor does not have one in the entire company and this is not a prime source item. Figures. So much for an easy Friday. I guess I'll be working on Saturday, St. Patrick's Day.
Now when should I celebrate? Friday or Saturday? What would a good Irish lad do?