Common Questions What is the maximum duct width for the ST-10

This SPDT air pressure switch features a versatile field-adjustable set point range of 0

Suitable for compatible R-410A residential and light commercial HVAC systems

If these components are functional but the board doesn't send voltage to the gas valve

propane setting during startup to ensure long-term reliability of the heat exchanger

Siemens Building Technology 257-02040 Valve Assembly 320720-756 Common Questions What is theThe Siemens Building Technology 257 02040 is a specialized 2 way normally open control valve assembly designed for high performance hydronic flow regulation. As a veteran grade pneumatic HVAC control valve, this unit is engineered with a 1 2 inch angle NPT by union male connection, facilitating streamlined installation in tight mechanical spaces. The forged brass body and internal brass trim ensure rugged reliability against the constant cycling of