Discharging System - Piper PA-32R-301 SARATOGA SP Maintenance Manual

COOLING (cont.)
J, Checking System For Leaks (cont.)
(1) Method One (cont.)
(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 Checking Compressor Oil and Chart 2106) then repeat Steps 1
thru 5.
(i) If no further leaks are found, the system may be evacuated and charged. (Refer to Evacuating
the System and Charging the System.)
(2) Method Two
(a) Remove the access panel at the rear of the cabin to gain access to the service valves.
(b) Remove the protective cap on the high pressure Schrader valve fitting and connect a charging
hose with a shut-off valve arrangement to the fitting. The charging hose must have a
Schrader fitting or adapter to fit the valve.
(c) Connect the other end of the charging hose to a small cylinder of refrigerant and purge the
hose by allowing a slight amount of refrigerant gas to escape from the Schrader valve fitting.
(d) The cylinder of refrigerant should be placed upright in a container of warm (125F max.)
water on a small scale.
(e) Allow approximately 1/2 pound of refrigerant to enter the system by opening the valve on
the charging hose and observing the weight change on the scale.
(f) Using an electronic leak detector, check all joints and repair any leaks.
(g) After completion of repair of any leaks, proceed to check the system in accordance with one
of the methods outlined for any other leaks.
(h) If no further repair is required on the system, it is now ready to evacuate in accordance with
Evacuating the System.
K.

Discharging System

Environmental regulations may require use of a collection
system when necessary to evacuate freon from system
Refrigerant can cause freezing of skin. Be particularly careful
not to allow contact with the eyes.
Do not allow refrigerant to escape too rapidly, as excessive oil
may be carried out of system. When hissing stops, system is
empty and valve should be closed if no further work is
planned.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
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1I7
21-50-00
Page 21-24
Reissued: July 1, 1993