Lennox XC25 – Servicing Units Delivered Void of Charge

If the outdoor unit is void of refrigerant, clean the system us­ing the procedure described below.

1. Leak test the system using the procedure outlined on page 22.

2. Evacuate the system using procedure outlined on page 23.

3. Use nitrogen to break the vacuum and install a new fil­ter drier in the system.

4. Evacuate the system again using procedure outlined on page 23.

5. Weigh in refrigerant using procedure outlined in figure 57.

6. Monitor the system to determine the amount of mois­ture remaining in the oil. It may be necessary to replace the filter drier several times to achieve the required dry­ness level. If system dryness is not verified, the compressor will fail in the future.


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