Figure 21-27. Leak Test Hookup
LEAK DETECTION.
There are several methods of doing this operation, depending on the type of equipment which is available.
Two methods of performing this check are described in the following paragraphs.
— Note —
Evacuate system prior to leak check.
1. Method 1:
A. Connect the manifold gauge set into the system and determine if there is any refrigerant in the
system. A minimum of 50 psi refrigerant pressure in the system is needed for leak detection. (Refer
to Figure 2 1-27)
B. Purge the hoses of air by allowing some refrigerant to escape from the connections at the service
valves. Then tighten connections at the service valve.
C. Close the low side manifold valve and open the high side manifold valve.
D. Open the refrigerant container service valve and allow the pressure at the low side gauge to reach
50 psi at which time close the high side manifold valve.
E. Close the refrigerant container service valve and remove the hose if no leaks are evident.
F. Using an electronic leak detector, check all joints for leaks. If any leaks are found, purge the system
of refrigerant, make the necessary repairs and check the compressor oil.
G. Add oil, if required, then repeat Steps A thru E.
H. If no further leaks are found, the system may be evacuated and charged.
989
PRESSURE GAUGE
SCHRADER VALVE
SCHRADER VALVE
CLOSED
OPEN
HIGH
LOW
REFRIGERANT
CONTAINER
MANIFOLD
GAUGE SET
EVAPORATOR
ASSEMBLY
OPEN TO 50 P.S.I.
THEN CLOSE
COMPOUND
GAUGE 50
P.S.I.
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
2 1 - 5 2 - 0 5
Page 21-61
Revised: May 15, 1989
1H4
PIPER AIRCRAFT
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