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
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