This CR Optima Series model features a robust internal motor protection system and sweat connections

The module supports both local and remote flame sensing and provides flame current test points for accurate signal monitoring

Will this relay fix a venter motor that won't start

System Protection: Integrated low-voltage monitoring prevents contactor chatter and potential hardware damage during fluctuating power events

Two-stage valves require two separate spring adjustments to manage high and low fire cycles

Siemens Building Technology 332-2973 Actuator L99H008 This CR Optima Series modelThe Siemens 332 2973 Actuator is a rugged, No. 4 pneumatic damper actuator designed for reliable control of HVAC dampers and mixing box units. Engineered with a durable all metal body and an ozone resistant EPDM rolling diaphragm, this piston type actuator provides consistent performance in demanding commercial environments. It features an 8 13 psi nominal spring range and a 4 inch stroke, making it the primary direct replacement for MCP 1140 1520