LEAK CHECK - METHOD II.
1. Remove the access panel at the rear of the cabin to gain access to the service valves.
2. 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.
3. 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.
4. The cylinder of refrigerant should be placed upright in a container of warm (125° F max. water on a
small scale.)
5. 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.
6. Using an electronic leak detector, check all joints and repair any leaks.
7. After completion of repair of any leaks, proceed to check the system in accordance with one of the
methods outlined for any other leaks.
8. If no further repair is required on the system, it is now ready to evacuate in accordance with
Evacuating the System.
DISCHARGING. (Required only if system contains refrigerant.)
—NOTE—
Applies to Kent Moore J23500 or similar charging station. (Refer
to Figure 21-10.)
1. Close all valves on charging station.
2. Connect red high pressure charging line to high pressure Schrader valve at the evaporator fitting.
3. Open valve (high pressure control) on charging station one turn.
4. Hold end of blue low pressure charging line in a shop rag and slowly open valve (low pressure
control) on charging station allowing refrigerant to exhaust from system into shop rag.
—CAUTION—
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.
21-50-10
Page 21-21
December 1, 1978
1F20
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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