Porsche 928 - WORKSHOP MANUAL 1977 Workshop Manual page 326

87
Air Conditioner
928
Topping up the air-conditioning sys-
tem
Note
There is not sufficient refrigerant in the system
if gas bubbles are visible in the sight glass of
the fluid reservoir when the air-conditioning
system is switched on.
1.
Syphon off the fluid from the air-conditioning
system.
2. Determine the volume of the refrigerating oil
which is syphonad off as well.
3. Fill system with new refrigerating oil.
4. Evacuate.
5. Check system for leaks.
6. Fill with prescribed filling quantity.
Filling the service unit with refriger-
ant
1. Connect the refrigerant bottle with the re-
frigerant inlet connection piece (12).
2. Open the valve on the refrigerant bottle and
shti-off valve 10.
3. Switch on the service unit with the main
switch (16). The green pilot lamp lights up.
4. If there is sufficient refrigerant in the service
unit, close the bottle valve. The system
switches off automatically when the refriger-
ant has been syphoned off up to the bottle
valve.
5. Close the refrigerant inlet shut-off valve (10).
Empty the service unit
Note
If the filling cylinder is full of refrigerant and it
is necessary to syphon off more refrigerant,
the clean refrigerant can be filled into a re-
frigemnt bottle. Pay attention to the maximum
filling weight. The
refrigerant bottle must not be overfilled.
1. Connect the refrigerant bottle with the re-
frigerant outlet connection piece (13).
2. Increase the pressure in the filling cylinder
to approx. 6 bar by cleaning the refrigerant.
3. Open the bottle valve and refrigerant outlet
shut-off valve (11).
4. After completing emptying, close the bottle
valve and shut-off valve.
Note
Do not empty the filling cylinder completely,
otherwise moisture may enter the service unit.
87
- 4h
Installation work on the air-conditioning system
0
Printed in Germany - XXV, laa0