or excessive vibration from an unbalanced blower wheel

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

Rapid Thermal Response: The low-mass stainless steel sensing bulb minimizes lag

For field diagnostics and ease of installation

Siemens Building Technology 332-2973 Actuator L99H008 or excessive vibration from anThe 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