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 TM5-4120-384-14
5-19.
REFRIGERANT
PRESSURE
CHECK.-Continued
Open high (discharge) pressure service valve slightly
e.
Tighten high pressure hose
to purge air from hose.
connection at gage fitting as soon as a hissing sound is
heard.
f.
Open low (suction) pressure service valve sliqhtly to
purge air from hose.
Tighten low pressure hose connection
at gage fitting as soon as a hissing sound is heard.
Open
low
(suction)
and
high
(discharge)
charging
valves.
g.
h.
Both gages should read the same.
Check the reading with the
appropriate column in Table 5-2.
If the system is even partially
charged, the pressure should be approximately equal to that shown
in the table for the appropriate ambient temperature.
If the
pressure is considerably less than shown in the table, the system
does not contain enough refrigerant to continue the pressure check;
proceed directly to leak testing.
(See para 5-14.)
Turn air conditioner on and operate in COOL mode with
i.
TEMPERATURE SELECTOR in full COOLER setting for a few minutes.
With unit operating
allow
gages
to
stabilize.
Take readings
j.
of
the
two gages.
(1) If discharge and suction pressures are at, or near, the
same value, a pressure equalizer solenoid valve L2 malfunction, or
an internal compressor failure is indicated.
5-40
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