which must be purchased separately if yours is out of spec

Precise feedback signals allow for real-time monitoring of damper position

which is the standard requirement for most air tool and control applications

or air conditioning systems

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

Siemens Building Technology 257-02040 Valve Assembly 320720-756 which must be purchased separatelyThe 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