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

COMPRESSOR NOISE
Excessive noise that occurs when the air conditioning is being used may be caused by:
- Loose bolts
- Mounting brackets
- Loose compressor clutch
- Excessively high refrigerant operating pressure

Verify the following before compressor repair is performed:
- Compressor drive belt condition
- Proper refrigerant charge
- Thermal expansion valve operating correctly
- Head pressure is normal