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Page Title:
Table 5-3. NORMAL OPERATING PRESSURES |
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 TM5-4120-384-14
5 - 1 9 . REFRIGERANT PRESSURE CHECK.-Continued
(2) If discharge pressure is low and suction pressure is
normal (see Table 5-3) a low refrigerant charge is indicated.
NORMAL OPERATING PRESSURES
Table
5-3.
Pressure Range (psig)
Temperatures
125F(51.70C)
100F(380C)
75F(240C)
50F(100C)
O u t d o o r Ambient
78-88
65-75
60-70
55-65
90F(32C)
Suction
Suction
Suction
Suction
Return Air to
305-325
410-430
Unit (Dry Bulb)
220-240
190-210
Discharge
Discharge
Discharge
Discharge
60-70
70-80
55-65
53-63
80F(27C)
Suction
Suction
Suction
Suction
Return Air to
295-315
395-415
210-230
Unit (Dry Bulb)
180-200
Discharge
Discharge
Discharge
Discharge
(3) If discharge pressure is normal and suction pressure
is
either high or low, failure or maladjustment of the pressure
regulator valve is indicated.
(4) If discharge pressure is high and suction
pressure
is
normal, a malfunction of quench valve is indicated.
k.
When pressure tests are
completed,
proceed
with
the
maintenance action indicated.
5-42
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