Preliminary Information
Service Unit SECU 134
1 - Low-pressure pressure gauge
2 - High-pressure pressure gauge
3 - Torr meter
4 - Low-pressure shutoff valve (blue)
5 - High-pressure shut-off valve (red)
6 - Torr meter shut-off valve (black)
7 - Vacuum pump shut-off valve (yellow)
8 - Low-pressure flange
9 - High-pressure flange
10 - Refrigerant inlet shut-off valve
11 - Refrigerant outlet shut-off valve
12 - Refrigerant oil inlet shutoff valve
13 - Refrigerant oil vent valve
14 - Moisture indicator
15 - Oil tank vacuum flange
16 - Hourmeter
17 - Pilot light SUCTION END
18 - Pressure switch SUCTION/CLEANING
19 - Main switch ON/OFF
20 - Pressure switch HEATING
21 - Pilot light FAULT
22 - Pressure switch VACUUM PUMP
23 - Filling cylinder with weight scale
24 - Filling cylinder shut-off valve
25 - Filling cylinder high-pressure gauge
26 - Refrigerant oil suction nozzle
27 - Refrigerant oil reservoir inspection glass
NOTE: The manufacturer's operating and repair instructions must be observed when carrying out all work on the service unit.
Assembly work involving the refrigerant system
During all work on the air-conditioning system which necessitates opening the refrigerant system, the system contents must first be disposed of correctly. When doing so, follow the safety regulations.
Dirt and moisture must be kept out of the air-conditioning system's pipe system. Thorough cleanliness must therefore be ensured during all work. System components must never be cleaned on the inside with hot steam. Use only nitrogen for cleaning purposes.
When replacing a component, all openings must be closed off with suitable plugs.
General assembly sequence
1. Remove refrigerant by suction.
2. Remove faulty part.
3. Evacuate.
4. Check the system for leaks.
5. Rinse with refrigerant.
6. Empty the system by suction again.
7. Evacuate.
8. Fill.
NOTE: Pay attention to sealing rings when disconnecting or connecting the hose connections.
A - High-pressure
B - Low-pressure
The charging valves are located in the area of the front right spring strut.