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Upright Freezer not cold - Assistance with my diagnosis Options  Email this topic  Watch this topic  Print this topic » Normal Threaded
Model: 253.29711990	Brand: Kenmore	Age: 5 - 10 years
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NoEcm		#11 Posted : Wednesday, June 11, 2008 1:46:18 PM(UTC)
Rank: Member Groups: Registered Joined: 5/29/2008(UTC) Posts: 11		Thanks, I'll go buy a tap to put on the process stub and check the pressures. I did borrow a 134a sniffer and ran it along the route that the Freon runs and it did not detect any leaks. Maybe the leaks in refrigerators are too small to be sensed by the sniffer?
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NoEcm		#12 Posted : Wednesday, June 11, 2008 2:52:21 PM(UTC)
Rank: Member Groups: Registered Joined: 5/29/2008(UTC) Posts: 11		Something like this?
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abadfish66		#13 Posted : Wednesday, June 11, 2008 7:11:51 PM(UTC)
Rank: Advanced Member Groups: Senior Expert Joined: 5/28/2008(UTC) Posts: 1,620		That's it :)
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NoEcm		#14 Posted : Thursday, June 12, 2008 2:15:23 PM(UTC)
Rank: Member Groups: Registered Joined: 5/29/2008(UTC) Posts: 11		Uncorrected pressure readings as follows: Static Pressure = 60psi With compressor running = -20 inHG Diagnosis? TIA!!!
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abadfish66		#15 Posted : Thursday, June 12, 2008 2:32:28 PM(UTC)
Rank: Advanced Member Groups: Senior Expert Joined: 5/28/2008(UTC) Posts: 1,620		Compressor is good, now with the tap left on there, charge up the system, if pressure maintains around 2inch vacuum you have a leak, if you charge it up and pressure stays lets say below 10 inches, you have a restriction
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NoEcm		#16 Posted : Thursday, June 12, 2008 4:23:38 PM(UTC)
Rank: Member Groups: Registered Joined: 5/29/2008(UTC) Posts: 11		Additional information and questions: On the label inside the freezer: 8oz R134a Design Pressures: LS 140 PSIG HS 320 PSIG With my Low Side static pressure at 60 PSI, does this automatically indicate that I have a freon loss? If the possibility still exists that there is a restriction, how difficult is it to find and repair the restriction?
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abadfish66		#17 Posted : Thursday, June 12, 2008 4:31:03 PM(UTC)
Rank: Advanced Member Groups: Senior Expert Joined: 5/28/2008(UTC) Posts: 1,620		Don't pay attention to those pressures on the label. Static pressure or stabilized pressure is usually between 50 and 60 psig, so your good. if there is a restriction chances are it's at the cap tube that goes into the evap, the picture you showed. You will need process tube adapters and some nitrogen to blow the system out.
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abadfish66		#18 Posted : Thursday, June 12, 2008 4:34:30 PM(UTC)
Rank: Advanced Member Groups: Senior Expert Joined: 5/28/2008(UTC) Posts: 1,620		hopefully it's just a leak that can be repaired, charge it and watch your lowside pressure and we'll go from there
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NoEcm		#19 Posted : Thursday, June 12, 2008 7:23:08 PM(UTC)
Rank: Member Groups: Registered Joined: 5/29/2008(UTC) Posts: 11		I'll borrow a recovery machine for this weekend and go from there. Another question. After the LS pressure draws down to -20 inHG and I unplug the freezer from power, it's taking ~15 minutes or so for the pressure to build back up to +60 PSI. Is this an unusual amount of time for the pressure to build back up?
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NoEcm		#20 Posted : Thursday, June 12, 2008 11:17:12 PM(UTC)
Rank: Member Groups: Registered Joined: 5/29/2008(UTC) Posts: 11		I guess I won't need the recovery machine after all. It turns out that I do have a leak in the sealed system (as suggested). After cycling the compressor a couple of times the LS pressure would only come back up to zero. I'll evacuate the system and recharge it with the recommended amount of R134a along with some dye and then look for the leak.
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