Operation CHARM: Car repair manuals for everyone.
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

Refrigerant Pressure Sensor / Switch: Specifications

ATC and Manual
Low psi control = opens < 29.4 psi PCM input = Pressure Transducer Line mounted

High psi control = opens > 431.0 psi PCM input = Pressure Transducer Line mounted