Evacuation Hookup Diagram - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
410
SUCTION
LINE
NOTE. OPEN BOTH SERVICE VALVES
(CLOCKWISE) ONE TURN
Figure 14-36. Evacuation Hookup
CAUTION
REFRIGERANT CAN CAUSE FREEZING OF SKIN. BE
PARTICULARLY CAREFUL NOT TO ALLOW CONTACT
WITH EYES. Do not allow refrigerant to escape too rapidly as
excessive oil may be carried out of system. When hissing stops,
pressure should read zero indicating the system is empty and
service valves should be closed if no further work is planned.
5. Open refrigerant drum valve and valve at base of charging cylinder and allow approximately
1/2 pound of refrigerant to enter cylinder.
6. Open valve 4 on charging station (refrigerant control) and flush out high and low pressure
lines by opening valves 1 and 2 momentarily until a white stream of refrigerant is observed. Close all valves.
b. EVACUATING SYSTEM.
NOTE
Be certain system has been depressurized before attempting to
evacuate.
I.
low pressure
2.
Connect red high pressure hose to the fire wall fitting high pressure Schrader valve and the blue
hose to the fire wall fitting low pressure Schrader valve. (Refer to Figures 14-38 and 14-42.)
Connect vacuum pump power cord to 1 10 volt outlet.
Reissued: 9/23/80
ACCESSORIES AND UTILITIES
4 H2