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I have a Carrier 38APD030 unit with Comfort Link, I keep getting an A120 code for low SST, the air handler is running at 35 hertz and is rated for 8200 CFM at 60hertz. I have return air reset in program to try to keep second stage compressor from coming on. Unit is lightly loaded at this time of year so we have BAS shut OA dampers to minimum whenever unit called for DX cooling. Unit was charged by the book during startup and no loss of charge has accured. 1st stage compressor is a compland with the disc unloading. Thanks

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I NEED THE MAKE AND MODEL OF THE T-STAT TO HELP YOU
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SOURCE: when charging central air unit r-22......

It sounds like you have your gages hooked up wrong. Blue goes to the Suction line (the big line) it should be cold when the units running.
Red goes to the liquid line (the little line).

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SOURCE: Copleland scroll compressor failure

I have scroll chiller contains scroll compressor tandom circuit. One of the compressor failure from it due to unbalance of the winding. Previously compressor thermistor opens two to three times. Also one phase open in contactor of the compressor. Can you guide me regarding the reason of compressor failure and what is the next step for the replacement of compressor. Also give guide line for the points take care.

Posted on Mar 27, 2010

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