Piper SARATOGA PA-32-301 Maintenance Manual page 127

PIPER AIRCRAFT
PA-32-301/301
MAINTENANCE MANUAL
COMPOUND
GAGE 50 P.S.I.
PRESSURE GAGE
CHRADER VALVE
CONTAINER
Figure 21-7. Leak Test Hookup
-NOTE-
Evacuate system prior to leak check.
LEAK CHECK - METHOD I.
1. 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 21-7.)
2. 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.
3. Close the low side manifold valve and open the high side manifold valve.
4. 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.
5. Close the refrigerant container service valve and remove the hose if no leaks are evident.
6. It is advisable to use an electronic leak detector to check this system instead of an open flame leak
detector due to the possible presence of gasoline fumes in the engine area.
7. If any leaks are found, purge the system of refrigerant, make the necessary repairs and check the
compressor oil.
8. Add oil, if required, (refer to Checking Compressor Oil and Chart 2107) then repeat Steps 1 thru 5.
9. If no further leaks are found, the system may be evacuated and charged. (Refer to Evacuating the
System and Charging the System.)
21-54-01
Page 21-21
Revised: August 11. 1983
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