LEAK CHECK
B. METHOD II
1. Remove access panel at rear of cabin to gain access to service valves.
2. Remove protective cap on high pressure Schrader valve fitting and connect a charging hose with a
shutoff valve arrangement to fitting. The charging hose must have a Schrader fitting or adapter.
3. Connect other end of charging hose to a small cylinder of refrigerant and purge hose by allowing a
slight amount of refrigerant gas to escape from Schrader valve fitting.
4. Place cylinder of refrigerant upright in a container of warm (125°F max,) water on a small scale.
5. Allow approximately 1/2 pound of refrigerant to enter system by opening valve on charging hose and
observing weight change on scale.
6. Using an electronic leak detector, check all joints and repair any leaks.
7. After completion of repair of any leaks, check system in accordance with methods outlined for any
other leaks.
8. If no further repair is required on system, it is now ready to evacuate in accordance with Evacuating
the System.
DISCHARGING (Required only if system contains refrigerant.)
—WARNING—
Refrigerant can cause freezing of skin. Be particularly careful
not to allow contact with the eyes.
—CAUTION—
Do not allow refrigerant to escape too rapidly. 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.
—NOTE—
Applies to Kent Moore J23500 or similar charging station. (Refer
to figure 21-8.)
I. Close all valves on charging station. (Refer to figure 21-8,)
2. Connect red high pressure charging line to high pressure Schrader valve at evaporator fitting.
3. Open high pressure control valve on charging station one turn.
4. Slowly open low pressure control valve on blue low pressure charging line. Allow refrigerant to
exhaust from system.
21 - 52 - 00
Page - 21 - 19
Reissued: August 1, 1986
1G9
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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