Article 4 Systematic checks

The following parts of the refrigeration, air conditioning or heat pump equipment shall be systematically checked:

1. 1..

   joints;

2. 2..

   valves including stems;

3. 3..

   seals, including seals on replaceable driers and filters;

4. 4..

   parts of the system subject to vibration;

5. 5..

   connections to safety or operational devices.