TM 5-3805-293-23-3
0045
A/C SYSTEM PERFORMANCE TEST CONTINUED
10. Monitor and record refrigerant recovery station discharge (high side) pressure gauge reading and suction (low
side) pressure gauge reading.
WARN I N G
Compare discharge (high side) pressure gauge reading and suction (low side) pressure
gauge reading to pressures listed on Pressure Range Table (Table 1 in this work package)
to determine if system is functioning correctly in current ambient temperature.
Pressure Range Table is for reference only.
Pressures listed are before A/Ccompressor clutch disengagement.
During normal A/C system operaiton in 70F (21C) ambient temperature, discharge (high
side) pressure will be 120 psi (820 kPa) to 190 psi (1,300 kPa). Suction (low side)
pressure will be 10 psi (70 kPa) to 20 psi (130 kPa).
Ambient temperature and humidity affect pressures.
If ambient temperature is high, dischage (high side) pressure will be high.
r
In very hot weather, discharge (high side) pessure and suction (low side) pressure will be
r
high.
In cooler weather, discharge (high side) pressure and suction (low side) pressure will
either be normal or lower.
Table 1. Pressure Range Table.
0045
Ambient Air Temperature
Discharge (High Side)
Suction (Low Side)
F(C)
Pressure psi (kPa)
Pressure psi (kPa)
70F (21C)
120 to 190 (820 to 1,300)
10 to 20 (70 to 138)
80F (27C)
140 to 210 (950 to 1,450)
10 to 25 (70 to 173)
90F (32C)
170 to 240 (1,175 to 1,650)
15 to 30 (105 to 210)
100F (38C)
190 to 270 (1,300 to 1,850)
15 to 30 (105 to 210)
110F (43C)
210 to 300 (1,450 to 2,075)
15 to 30 (105 to 210)
11. If discharge (high side) pressure reading and suction (low side) pressure reading is not within normal operating
range, perform troubleshooting procedures (WP 0022).
END OF TASK
