and 3155 Series units

the 511-330-097 ignition board prevents gas buildup during failed ignition attempts

this twin-tube pneumatic line simplifies the routing of dual-signal control paths

This screw-in water heater element features 1-inch NPSM threads (1-1/2 inch hex head) and a 19

Siemens Building Technology GMA131.1U Actuator R-407C and 3155 Series unitsThe Siemens Building Technology GMA131. 1U is a specialized OpenAir electronic damper actuator engineered for commercial HVAC applications. This 24V spring return actuator provides 62 lb in torque (7 Nm), making it an ideal choice for managing return air, mixed air, and exhaust dampers in both constant and variable air volume (VAV) systems. Designed with three position control (floating), it allows for precise positioning while ensuring a reliable