Leak Check - Method I - Piper SENECA II Service Manual

PIPER SENECA II SERVICE MANUAL
COMPOUND
GAGE 50 P.S.I.
CLOSED
L
~
PRESSURE GAGE
I I --
1 ~
L
I MAl,IFOLD
~
GAGE SET
REFRIGERANT__/\_'
CONTAINER
OPEN TO 50 P.S.I.
THEN CLOSE
Figure
14-27.
Leak Test Hookup
SCHRADER VALVE
SCHRADER VALVE
EVAPORATOR ASS'Y
14-IO0.
CHECKING THE SYSTEM FOR LEAKS. There are several methods of doing this operation,
depending on the type of equipment which is available. Two methods of performing this check will be
covered in the following paragraphs.
NOTE
Evacuate system prior to leak check.
14-IOI.
LEAK CHECK - METHOD
I.
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
14-27.)
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. 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.
g. If any leaks are found, purge the system of refrigerant, make the necessary repairs and check the
compressor oil.
h. Add oil, if required, (Refer to Paragraph
14-112
and Table XIV-Xl)then repeat Steps a thru e.
i.
If no further leaks are found, the system may be evacuated and charged. Refer to Paragraphs
14-104
and
14-105.
Reissued: 10/11/79
ACCESSORIES AND UTILITIES
3D7