TM 9-4120-403-14
TABLE 5-2. NORMAL OPERATING PRESSURES (In Full Cooling DECREASE Mode)
Temperatures
Pressure Range (psig)
Outdoor Ambient
50 (10 )
F
C
75 (24 )
F
C
100 (38 )
F
C
120 (49 )
F
C
90 (32 ) Return
F
C
52-62
57-67
66-76
74-84
(Dry Bulb)
Air to Unit
Suction
Suction
Suction Suction
175-195
235-255
300-320
370-390
Discharge
Discharge
Discharge
Discharge
80 (27 ) Return
F
C
47-57
53-63
60-70
70-80
Air to Unit
Suction
Suction
Suction
Suction
(Dry Bulb)
165-185
215-235
290-310
360-380
Discharge
Discharge
Discharge
Discharge
70 (21 ) Return
F
C
45-55
45-55
49-59
57-67
Air to Unit
Suction
Suction
Suction
Suction
(Dry Bulb) 140-160
205-225
285-305
365-385
Discharge
Discharge
Discharge
Discharge
NOTE
Wet bulb temperature uncontrolled (dry coil) pressure ranges are +/-5 (Suction) and +/-10 (Discharge) psig
about the tested nominal.
TABLE 5-3. NORMAL OPERATING PRESSURES (In By-Pass Cycle)
Temperature
Pressure Range (psig)
Outdoor Ambient
50 (10 )
F
C
75 (24 )
F
C
100 (38'C)
F
120 (49 )
F
C
90 (32 ) Return
F
C
47-57
47-57
47-57
47-57
Air to Unit
Suction
Suction
Suction
Suction
105-125
147-167
208-228
284-304
Discharge
Discharge
Discharge
Discharge
80 (27 ) Return
F
C
47-57
47-57
47-57
47-57
Air to Unit
Suction
Suction
Suction
Suction
105-125
146-166
208-228
284-304
Discharge
Discharge
Discharge
Discharge
70 (21 ) Return
F
C
47-57
47-57
47-57
47-57
Air to Unit
Suction
Suction
Suction
Suction
105-125
142-162
205-225
280-300
Discharge
Discharge
Discharge
Discharge
5-34