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

Ambient Temperature Sensor / Switch HVAC: Testing and Inspection

Ambient Temperature Sensor

Ambient Temperature Sensor:

Testing: Suggest best method of testing is by substitution. Resistance should be no greater than 3.9K ohms.