|
| |
TM 9-4120-367-14
TM 07592B-14/1
6.1 PRESSURE TEST. - Continued
Location/Item
Action
Remarks
Procedure
a. Turn the MODE switch to COOL, and the TEM-
PERATURE SELECTOR switch to maximum
COOLER.
b. Slowly open the charging valves to which pressure
gauges have been connected.
c. Let the air conditioner operate for at least 15 min-
utes in the COOLING mode, so that all parts of the
system are stabilized.
d. Record the temperatures indicated by both ther-
mometers and the pressure indicated by both
pressure gauges.
e. Compare the readings obtained from pressure
testing with the normal ranges shown in table 6-1.
Analysis of
a. If actual pressure-temperature relationships differ
Discrepancies
from those shown in table 6-1, take appropriate
action.
(1) If pressures are too low, see table 6-3 and
table 6-4.
(2) If pressures are too high, see table 6-2.
(3) If discharge pressure is extremely high and
suction pressure is extremely low, blockage
may exist in the refrigeration system. Trouble-
shoot, correct the trouble, recharge if neces-
sary, and repeat the pressure test.
Completion
a. After pressure testing has been successfully com-
pleted, close the suction and discharge service
valves.
b. Drain the pressure from the charging manifold and
hose very slowly by cracking the hose on the suc-
tion and discharge service valves.
c. Remove thermometers and charging manifold from
the unit.
6-3
|
