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)

Or, hide this message: temporarily or permanently

Evaporator Temperature Sensor / Switch: Description and Operation

The A/C thermostat senses evaporator temperature. With the evaporator temperature above 41 degrees F (5 degrees C), the switch closes to activate the A/C compressor clutch. With the evaporator temperature below 33 degrees F (less than 1 degree C), the A/C thermostat opens. In this way, the evaporator temperature stays above 32 degrees F (0 degrees C) and moisture on the evaporator tins will not freeze and block air flow.