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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Refrigerant Pressure Sensor / Switch: Description and Operation

A/C off if discharge pressure is greater than 400 psi +1-20 psi and back on at 250 psi +1-50 psi. Cooling will run for 180 seconds after A/C is turned off if pressure switch is activated. A/C off if discharge pressure is less than 40 psi.