Checking For External Leaks

Tightening Torque:
- Hex. screw for pressure test plate on refrigerant compressor
17 Nm

Special Tool:
- Pressure test plate 109 589 00 25 00

Conventional Tools:
- Refrigerant bottle with R 12
e.g. made by Christof Fischer, Augsburger Str. 289, D-7000, Stuttgart 60
- Assembly tester with 3 filling hoses or evacuating and filling unit (service unit) for air-conditioning system
e.g. made by Christof Fischer, Augsburger Str. 289, D-7000, Stuttgart 60

Checking:
1. Check installed sealing rings (3) on refrigerant compressor (1) for condition and replace, if required, and provide with refrigerant oil.






Layout O-rings on pressure and suction connection
1 Refrigerant compressor
2 Carrier
3 0-ring
4 Suction connection
5 Pressure connection

2. Screw pressure test plate (3) with available hex. screw and spring washer (2) to refrigerant compressor (1).






Layout pressure test plate on refrigerant compressor
1 Refrigerant compressor
2 Hex. screw with spring washer
3 Pressure test plate
4 Suction connection
5 Pressure connection






Assembly tester with connections

3. Connect hose line (10) on center connection of assembly tester (2) and on valve top (13) of filling cylinder (12).
4. Connect the two hose lines (5 and 9) to assembly tester (2) and to Schrader valves (suction and pressure connection) on pressure test plate (3).






Layout pressure test plate on refrigerant compressor
1 Refrigerant compressor
2 Hex. screw with spring washer
3 Pressure test plate
4 Suction connection
5 Pressure connection

5. With valve opened (A and B) on assembly tester, let refrigerant vapor flow into refrigerant compressor. A bottle or filling cylinder pressure of 4 bar gauge pressure is required.
6. Open oil check screw (3) in compressor housing and let air flow out until refrigerant vapors are coming out.
7. Screw back oil check screw and permit bottle pressure in refrigerant compressor to stabilize.






Refrigerant compressor with electromagnetic clutch and carrier
1 Refrigerant compressor
2 Carrier
3 Oil check screw
4 Electromagnetic clutch

8. In installation position of refrigerant compressor (oil pan in downward direction), rotate compressor shaft several times manually in direction of rotation.
9. Check refrigerant compressor with leak tester for leaks.
10. Close valve top (13) on filling cylinder again and remove hose lines on pressure test plate (3).
11. Unscrew oil check screw and let refrigerant oil run out, if any. Then fill specified quantity of refrigerant oil into compressor housing. Specifications






Layout pressure test plate on refrigerant compressor
1 Refrigerant compressor
2 Hex. screw with spring washer
3 Pressure test plate
4 Suction connection
5 Pressure connection

12. Remove pressure test plate (3) again, but only shortly before attaching pipeline.