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Chrome-bevel sheet on grid paper — specs and return notes filed under the bay.
for long wire runs
often caused by the pressure switch not closing due to low draft
Standard failure points include heat-induced brittleness
This valve is designed for natural gas units and replaces the White-Rodgers 37C73U-171 or the older 37C73U-274
this switch is the direct replacement when troubleshooting "pressure switch stuck open" faults or intermittent ignition failures
Belimo TFRB120 Actuator 340155-7026 for long wire runsThe Belimo TFRB120 is a specialized spring return actuator designed for reliable on off control in HVAC systems. Delivering 22 in lb of torque, this fire and smoke damper actuator ensures fail safe positioning during power interruptions, making it a critical component for life safety applications. Engineered for versatility, it features a universal power supply that accepts 100 to 240 VAC, simplifying field installations across various line voltage