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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Two Way Flow Heater System

SYSTEM OUTLINE

When all of the following conditions are met, the recirculation/fresh air inlet damper is switched to the DUAL MODE position.

- The recirculation/fresh air switch is at FRESH position
- The blower SW is on.
- The max hot SW is on.
- The foot mode SW is at FOOT or F/D position.