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this air pressure switch (often cross-referenced as FS3440-894) ensures that proper venting is established before allowing the burner to cycle
OEM Compatibility: Exact replacement for 97J40 and 97J4001
System Stability: High-performance hot gas bypass valve design prevents evaporator coil icing and maintains constant outlet pressure
By optimizing fan speed selection
Siemens Industrial Controls 3TX7131-4CH13 Relay 321894-708 this air pressure switch (oftenThe Siemens Industrial Controls 3TX7131 4CH13 is a heavy duty enclosed power relay designed for high demand HVACR and industrial automation applications. Featuring a DPST NO (Double Pole Single Throw, Normally Open) contact configuration, this 30 Amp relay provides reliable switching for single phase loads, including compressors, motors, and heating elements. Built for versatile integration, the unit supports both DIN rail and panel mounting, with
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