Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Compressor HVAC: Testing and Inspection

Excessive noise while the A/C is being used, can be caused by loose mounts, clutch, or high operating pressure. Verify compressor drive belt condition, proper refrigerant charge and head pressure before compressor repair is performed.

Compressor Noise And Compressor Clutch Diagnosis Chart:

For noise diagnostic procedures, refer to the Compressor Noise and Compressor Clutch Diagnosis Chart.