>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 4 should have been 14 (typo). 14at is 200psi. The temperature/pressure
charts I have here show:

                R12     R22     R500    R502    R717

0 deg C         30.1    57.5    37.9    68.2    47.6    (psig)
32 deg F

17 deg C        60.1    105.4   73.5    119.6   96.9    (psig)
62 deg F

The refrigeration manual says that the evaporator pressure is always
positive (why). System charging is always by mass not by pressure.

The pressure in the system may be highest on the compressor outlet as you
say.

Strange, those split a/c units are circulating refrigerent at 15 at in and
out of a house using flexible hoses ?! Ouch.

Peter

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