Service Port HVAC: Description and Operation

Connections For Quick-Release Coupling on Refrigerant Circuit

CAUTION:
- There is a danger of ice-up.
- Refrigerant may leak out if refrigerant circuit is not discharged.
- Refrigerant must be extracted before opening refrigerant circuit.

- Only valves and connections that are resistant to refrigerant R134a and refrigerant oil must be installed.
- Different connections (outer diameter) for high pressure and low pressure side.
- Always screw on sealing caps.

Arrangement in vehicle.

Extraction and filling valve with Schrader valve







A - Service connection (soldered in)
B - Schrader valve insert
C - O-ring seal (belongs to valve)
D - Sealing cap with seal

Evacuating and charging valve, high pressure side







1. Socket with external and internal threads
2. O-ring: 10.8 mm; 1.8 mm identification: black or colored
3. Evacuating and charging valve with groove for O-ring and external or internal thread M 8x1 for cap
4. O-ring for cap, 10.8 mm; 1.8 mm identification: black or colored
5. Cap

Evacuating and charging valve, low pressure side







1. Socket with external thread and groove for O-ring
2. O-ring: 7.6 mm; 1.8 mm identification: black or colored
3. Evacuating and charging valve internal thread for cap M 8x1
4. O-ring for cap, 7.6 mm; 1.8 mm identification: black or colored
5. Cap