Charging Stand; Using The Airplane Compressor To Charge The System - Piper ARROW III Service Manual

CHEROKEE ARROW III SERVICE MANUAL
If bubbling occurs in sight glass, reopen the cylinder base valve
momentarily to equalize drum and cylinder pressure.
e. Connect the heating element plug to a 110-volt outlet.
f. Turn cylinder sight glass to match pressure reading on cylinder pressure gauge. This scale should
be used during entire charging operation.
g. Close valve 1 (low pressure control), fully open valve 4 (refrigerant control) and allow all the
liquid refrigerant contained in the charging cylinder to enter high side of aircraft system.
h. When the full charge of refrigerant has entered the system, close valve 4 (refrigerant control) and
valve 2 (high pressure control).
i. After completion of charging, close all valves on the charging stand. Disconnect the high and low
pressure charging lines from the aircraft system. (A small amount of refrigerant remaining in the
lines will escape.) Replace lines on holder of charging stand to keep air and dirt out of lines. Open
the valve at the top of cylinder to relieve any remaining pressure then reclose the valve.
j. Reinstall protective caps of Schrader valves and any access panels previously removed.
14-16. USING THE AIRPLANE COMPRESSOR TO CHARGE THE SYSTEM. This method is the least
desirable due to the requirement of operating the airplane's engine to run the compressor.
If the air conditioner is to be operated during ground servicing, the test area
should be clean and free of any loose objects lying on the ramp. Only the
service valve located on the evaporator assembly should be used for testing.
Revised: 2/13/89
Figure 14-7. Charging Stand
NOTE
WARNING
3A19
ACCESSORIES AND UTILITIES