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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Vacuum Switching Valve

Operation of this valve can be checked by listening for noise from the valve when it is electrically actuated. The valve can he electrically actuated by connecting the connector terminals directly to battery with jumper wires.