Piper SARATOGA PA-32-301 Maintenance Manual page 133

2611
PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
DISCARGE LINE
SUCTIO LINE
CONENSER
-
COM ESSOR
REFRIGERNT
RECEIVER
DEHYDRATOR I
SIGHT GLASS I
P ILLARY SW CH VA
COIL
CONTAINER OF
WARM WATER
(125oF)
OPTIONAL ME THOD
AEVAPORATOR
THIS END OF OSE
MUST HAVE DEVICE
TO DEPRESS
SCHRADER VALVE
C HARGING
STAND
PREFERRED METHOD
Figure 21-10. Charging Hookup
10. Shut off air conditioning system and airplane engine. Then, remove the charging lines from the
Schrader valves with care due to the refrigerant remaining in the hose.
- NOTE -
A shop cloth should be used to divert escaping refrigerant when
disconnecting the charging hosefrom the Schrader valve. Recap the
valve.
ADDITION OF PARTIAL CHARGE TO SYSTEM.
It is possible to top off this system with refrigerant by the following method:
1. Remove the access panel at the rear of the cabin.
2. Connect a charging hose to a refrigerant cylinder and also to the Schrader valve fitting on the suction
line. (Refer to Figure 21-10.)
3. Purge the charging hose by allowing a small amount of refrigerant gas to escape at the Schrader valve
fitting.
4. Start the engine and operate at 1000 RPM and turn the air conditioner on maximum cool.
5. Remove the plastic plug from the sight glass in the top of the receiver-dehydrator.
6. With a low refrigerant charge in the system, bubbles will be seen passing through the sight glass when
the system is operating.
7. Open the valve on the refrigerant cylinder.
21-57-03
Page 21-27
Revised: August 11. 1983
1F13