TM 5-3805-291-23-1
AIR CONDITIONING SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0018 00
REFRIGERANT QUICK-CHECK PROCEDURE FOR R-134A EXPANSION VALVE AND ORIFICE TUBE
SYSTEMS - CONTINUED
N OT E
If system is very low on refrigerant, a partial charge may be needed before you perform a leak test.
a.
Recover remaining refrigerant (WP 0222 00).
b.
Repair all leaks.
c.
Evacuate system (WP 0222 00).
d.
Charge system with correct amount of refrigerant. Measure refrigerant by weight (WP 0222 00).
Perform a performance check. Refer to Performance Checks for Air Conditioning System in this work package.
e.
f.
If problem still exist, go to step 6.
4.
Feel low pressure line and feel high pressure line at compressor. In order to indicate normal systems operation, high
pressure line to condenser coil must be warm, while low pressure line to evaporator coil must be cool.
a.
High pressure line and low pressure line at compressor have a minimal temperature difference between two lines.
Use procedure in step 5.
b.
If there is a definite temperature difference between high pressure line and low pressure line at compressor, system
is operating correctly. High pressure line will be warm. Low pressure line will be cool. Use procedure in step 6.
5.
If system has no refrigerant charge or if system is nearly empty of refrigerant charge, perform the following procedure:
a.
Stop engine (TM 5-3805-291-10).
b.
Perform a partial charge of system (WP 0222 00).
Perform a leak test. Refer to Refrigerant Leakage Test in this work package.
c.
d.
Repair leaks.
e.
Evacuate system (WP 0222 00).
f.
Charge system with correct amount of refrigerant. Measure refrigerant by weight (WP 0222 00).
Perform a performance check. Refer to Performance Checks for Air Conditioning System in this work package.
g.
0018 00-6