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Thread: Compressor RLA
07-22-2012, 02:57 PM #1New Guest
- Join Date
- Jul 2012
I have a York 5 ton A/C system with a gas furnance. The A/C tech that recently perform a Preventive Maintenance Yearly Service told me that my compressor was not operating efficiently based the RLA spec to the actual ampere reading. The RLA is 28.9 and the ACTUAL reading was 22.6 amps. He said that indicated the compressor has tight windings and would not last much longer. He also said the ACTUAL ampereage reading should be half of the RLA, which in this case would be 14.45 amps.
My question is: Is would he stated a true statement? Please state the facts as to why it is or is not true. I would greatly appreciate some factual basis so I can make an educated decision as to whether or not to purchase a NEW system or whether I can wait.
07-22-2012, 03:15 PM #2
07-22-2012, 03:17 PM #3
07-22-2012, 03:19 PM #4
The the actual amp draw of the compressor will vary with the indoor and outdoor conditions.
In mild outdoor conditions, with not much load on the evaporator coil, it may run as low as half the RLA.
Under normal load conditions, it may run around 3/4 of the RLA.
Under high load conditions, but within the envelope of what the system is designed for, it may pull very near RLA.
During a hot pull down after a repair on a hot day, where it is also abnormally hot in the house, it may pull higher than RLA.
As for the technician, based on the information given, I'll just say he is wrong, and leave it at that.If more government is the answer, then it's a really stupid question.
07-22-2012, 03:26 PM #5
07-22-2012, 03:46 PM #6
They usually get paid nothing for a cooling check-up if they don't sell a repair or replacement.
We don't know that for sure based on the info given though, he could just be stupid.
If more government is the answer, then it's a really stupid question.
07-22-2012, 04:55 PM #7
Your tech is incorrect.
He may be confusing LRA with RLA. Similar acronym, but completely different meanings."Better tell the sandman to stay away, because we're gonna be workin on this one all night."
"Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."
"Just get it done son."
07-22-2012, 05:21 PM #8Professional Member*
- Join Date
- Dec 2010
- Palm Beach,Fl.
07-22-2012, 05:58 PM #9
Huh... tight windings? That's a new one. I would hope that the windings would stay at pretty much the same...ummm...errrr.... "tension" ...being bonded to the stator in a varnish and all.
IF a motor is about to fail... you won't see it looking at amperage unless maybe it's a bearing abut to lock-up.
TO check motor health, you have to test the windings with a special high tester to check for failing insulation. You might be able to test for compressor health with a refrigerant sample, or by performing vibration analysis... but that's a little overkill for a residential AC unit... or any hermetic motor under about 50-100 HP.
Lets put it this way. "loose" and "tight" are mechanical terms. The only think mechanical in a motor is the bearing. Bearing don't get tighter as they wear.
07-22-2012, 06:02 PM #10