TM 9-4120-388-14
5-13. REFRIGERANT PRESSURE CHECK - Continued.
Table 5-3. Normal Operating Pressure (In Full Cooling DECREASE Mode.)
Pressure Range (psig)
Temperatures
75F
100F
120F
50F
Outdoor
(24C)
(49C)
(10C)
Ambient
(38C)
74-84
52-62
57-67
66-76
90F (32C)
Suction
Suction
Suction
Suction
Return Air to
175-195
235-255
300-320
370-390
Unit (Dry Bulb)
Discharge
Discharge
Discharge
Discharge
47-57
70-80
53-63
60-70
80F (27C)
Suction
Suction
Suction
Suction
Return Air to
165-185
215-235
290-310
360-380
Unit (Dry Bulb)
Discharge
Discharge
Discharge
Discharge
49-59
45-55
45-55
57-67
70F (21C)
Suction
Suction
Suction
Suction
Return Air to
140-160
205-225
285-305
365-385
Unit (Dry Bulb)
Discharge
Discharge
Discharge
Discharge
NOTE: Wet bulb temperature uncontrolled (dry coil)
Pressure ranges are 5 (Suction) & 10 (Discharge) psig about the tested nominal.
Table 5-4. Normal Operating Pressure (In By-Pass Cycle.)
Pressure Range (psig)
Temperatures
75F
100F
120F
50F
Outdoor
(10C)
(24C)
Ambient
(38C)
(49C)
47-57
47-57
47-57
47-57
90F (32C)
Suction
Air to Unit
Suction
Suction
Suction
105-125
147-167
208-228
284-304
Discharge
Discharge
Discharge
Discharge
47-57
47-57
47-57
47-57
80F (27C)
Suction
Air to Unit
Suction
Suction
Suction
105-125
146-166
208-228
284-304
Discharge
Discharge
Discharge
Discharge
47-57
47-57
47-57
70F (21C)
47-57
Air to Unit
Suction
Suction
Suction
Suction
105-125
142-162
205-225
280-300
Discharge
Discharge
Discharge
Discharge