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if the sensor is "open" or "shorted" while within its normal operating range
ensure proper wrap-around heat sinking on the 7/8" ODF connections to protect the internal power assembly and diaphragm during brazing
though mounting hole modifications may be required if the original footprint differs from the 5
and JR(A)020
Lennox 51M87 Pressure Switch THPU32HP7Y if the sensor is "open"The Lennox 51M87 is a precision engineered furnace pressure switch designed for critical venting safety within Lennox HVAC systems. This 1. 6" WC SPDT N. O. pressure switch functions as a fail safe, ensuring the inducer motor is generating adequate static pressure before allowing the ignition sequence to proceed. The 51M8701 is the identical direct replacement, maintaining the exact factory set point of 1. 60 inches of water column. As a Single Pole