- Always conduct visual inspections to identify potential for leaks.
- Leak indicators can include oil spots/pools, dirt spots, missing port caps, etc.
- Unidentified leaks lead to call backs & headaches.
- Remember: Systems can have low refrigerant charge from simply connecting gauges over & over.
Due to the potential for leaks with R-22 equipment combined with the costly nature of call backs, and regulator fines: Always look to identify potential leaks before converting a system to TdX 20. Typically, a visual inspection of the unit + a baseline of system operation + sufficient standing nitrogen and vacuum tests will suffice in ensuring the system is tight and leak free. If leak indicators are found, use a leak detector, such as the Bacharach H-10 (Figure 1), to scan the system prior to converting.
- Always conduct a visual inspection first, looking for oil spots and other signs of leaks.
- When practical, baseline system operation to determine if the system is low on charge.
- If there is a potential for a leak, use refrigerant leak detector to scan for leaks prior to recovery.
- Always conduct sufficient standing nitrogen pressure tests (e.g. low-side nameplate pressure).
- Use a trace amount of refrigerant with nitrogen charge to enable use of a leak detector.
- Start with bubbles if system is not holding pressure.
- Always conduct sufficient standing vacuum test.
- Pay attention to the condenser coils when conducting a scan with a leak detector.
- When conducting a standing nitrogen pressure test, the pressure will change with temperature.
- Use the standing pressure test calculator in the Bluon Mobile App to check pressure changes.
- When using leak detector, work far-to-near from the suspected leak to pinpoint its location.
- Calibrate leak detector sensitivity to filter out false alarms.
- Shut off airflow when conducting leak detection.