York S1-024-35780-000 Pressure Switch Technicians should verify that the

Technicians should verify that the internal actuator housing is free of oil and moisture before installation to prevent premature degradation

it prevents unnecessary system lockouts and ensures safe furnace operation

Is the 8402-020BX a direct replacement for the 8402-020

allowing legacy or current-loop controllers like the UDC series

or a cracked heat exchanger causing abnormal heat distribution

York S1-024-35780-000 Pressure Switch Technicians should verify that theThe York S1 024 35780 000 Pressure Switch is a critical safety component designed for precise HVAC draft inducer motor monitoring. This SPNO (Single Pole Normally Open) switch features a fixed set point of 1. 0" WC (Water Column), engineered to close on a fall in pressure. As an authentic OEM York replacement part, it ensures exact calibration for residential furnaces and package units, maintaining the necessary pressure differential for safe