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 Pressure Switch

This system is equipped with a compressor pressure switch that is normally open. The switch activates at 2758-2758 kPa (380-400 psi). The switch releases at 1724 kPa (250 psi).

The switch drives the recirculation door to the closed position in order to reduce the system load and decrease the system high-side pressure.