Siemens DDC R540-100 Control 323613-751 these gas pressure switches should

these gas pressure switches should be mounted horizontally with the 1/4" NPT inlet stem facing down

The module is associated with a 208–230 VAC

this OEM replacement motor is the standard specification for maintaining static pressure and system efficiency in a wide range of air handler and furnace configurations

Thermal Resistance: High-grade metallurgical construction preserves valve reed elasticity and sealing capability under high-compression ratios

Using an 840 RPM motor in place of a 1075 RPM or 1100 RPM motor will lead to insufficient heat rejection across the coils

Siemens DDC R540-100 Control 323613-751 these gas pressure switches shouldThe Siemens R540 100 is an Open Processor (OP) Terminal Box Controller designed specifically for Variable Air Volume (VAV) systems within the Siemens APOGEE network architecture. This Refurbished Terminal Box Cntrl operates using P1 FLN (Floor Level Network) protocols, allowing for seamless integration into legacy BTU Building Automation Systems. This DDC component manages specific HVAC applications, including pressure independent VAV and single duct