Service valves

The air conditioning must be filled with 1000 grams of refrigerant. Refrigerant may only be topped up on the high pressure side of the system. This is to avoid the risk of liquid refrigerant entering the compressor. The valves are different sizes. This is to avoid incorrect connection. The service valves can be used for:

• Checking through the manometer connections.
• Draining the refrigerant from both valves.
• Evacuating/vacuum cleaning through both valves.
• Filling with refrigerant on the high pressure side.