This is a normally open (NO) switch

or the furnace failing to start

this black with blue stripe tubing allows for easy line identification in complex control panels and multi-run installations

System Stability: Safeguards remote temperature selector settings to maintain consistent discharge air temperatures

KMC Controls REE-4002 Relay Module Els PW 17895 This is a normally openThe KMC Controls REE 4002 Relay Module is a purpose built control interface designed for VAV fan powered induction boxes and terminal unit management. Engineered for precise coordination between airflow and thermal demands, this module integrates a single stage fan control with 2 stage electric reheat capabilities. When paired with a direct acting CTE series room thermostat, the REE 4002 allows technicians to fine tune the fan start point between 0 to