For field diagnostics and ease of installation

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

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

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

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

Siemens Building Technology 332-2973 Actuator L99H008 For field diagnostics and easeThe 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