A General Description

Perform a refrigerant leak test on the system if you suspect a leak because of the following conditions:
^ A system indication of a low charge
^ A service operation which disturbed the following items:
- Components
- Tubes
- Connections

Before beginning the leak test, ensure that the refrigerant system has a sufficient charge. Measure the static pressure by using a gauge set. The system must have a pressure above 345 kPa (50 psi) for an acceptable leak test.

Most leaks occur at the refrigerant fittings or at the connections. Leaks may result from the following conditions:
^ Incorrect torque
^ Damaged O-rings
^ Lack of lubricant on the O-rings
^ Dirt or debris across an O-ring

The smallest piece of lint from the following items may create a leak path along an O-ring:
^ Cotton gloves
^ Shop cloths