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02-10-2009, 03:43 AM #1
Can a 4ton HVAC compressor pump down?
I am an HVAC design engineer, not a certified service tech. Don't worry, they don't let me use the wrenches and gages.
I have a contractor recommending to use a small (4ton) heat pump system compressor to pump the refrigerant into the outdoor unit by closing the liquid line service valve and running the compressor. Don't know if he proposes to bypass the low pressure switch or not. There is no receiver to store refrigerant, only condenser coil tubing.
I understand semi-hermetics are built to do this on a regular basis, and have receivers for storage, but what about the small residential scroll and recip. cans?
Aren't they refrigerant cooled motors?
I would prefer to reclaim thru a filter/drier and either replace or re-use thru another filter/drier instead of stressing the system compressor.
If this was only one system, maybe no big deal, but there are several hundred to do.
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