Peter L. Peres said:
> 4at or less system pressure, vacuum on the evaporator side, depends on
> temperature, capacity and refrigerent. The pressure is highest at high
> ambient temp. when the unit is not running. Then all the refrigerent
> tries to be a gas.

I don't think so. Of course the exact pressure all depends on the
refrigerant used and the temperature and the level of charge. However, the
highest pressure is always going to be after the pump when the system is
running.

The highest pressure the evaporator gets is when not running, but it is
still less than the high side when running. Note that gauge sets use
different scale gauges for the two sides.

Also, the evaporator should never be run at a vacuum. There are
protections against this in auto and commercial A/C systems.

Cheers,

Bob

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