Thread: AC leak
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Old 07-29-15, 12:12 PM   #6
Elcam84
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Correct. The switch won't let it go into a vacuum on the low side like you need it to when pumping down a system. In fact walk in freezers have a solenoid that closes the high side at the evaporator at the end of the cooling cycle and the compressor pumps all the refrigerant against it. That way when he system has to cool again it instantly cools instead of having to wait for the liquid to get up to flow and pressure.

The 19 seer ish and up of most brands you can't do this method and you have to use a recovery machine. They also have a small computer you hook up on the super high seer units that has lots of info including telling you if it needs more or less refrigerant. That's the only benefit to the super high seer units.
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