Figure 21-9. Charging Hookup
10. Shut off air conditioning system and airplane engine. Remove charging lines from Schrader valves.
Use a shop cloth to divert escaping refrigerant when disconnecting charging hose from Schrader valve.
Recap valve.
ADDITION OF PARTIAL CHARGE TO SYSTEM
Add refrigerant to system as follows:
1. Remove access panel at rear of cabin.
2. Connect charging hose to refrigerant cylinder and also to Schrader valve fitting on suction line. (Refer
to figure 21-9.)
3. Purge charging hose by allowing a small amount of refrigerant gas to escape at Schrader valve fitting.
4. Start engine and operate at 1000 rpm. Turn air conditioner on maximum cool.
5. Remove plastic plug from sight glass in top of receiver-dehydrator.
6. With a low refrigerant charge in system, bubbles will be seen passing through sight glass when system
is operating.
7. Open valve on refrigerant cylinder.
8. Allow refrigerant to flow into system until bubbles disappear from sight glass.
9. Close refrigerant valve and check that sight glass remains clear during system operation.
10. When sight glass stays clear of bubbles, add an additional I/4 pound of refrigerant to system. (Engine
should be operating at 1000 rpm with air conditioner ON.)
21 - 52 - 00
Page - 21 - 24
Reissued: August 1, 1986
1G14
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
To Next Page
Loading...
