Aprilaire 4851 Relay Els PW 17895 while the large T-handle adjustment

while the large T-handle adjustment allows for easy manual calibration under load

providing durability and a maintenance-free operational life

A zero reading typically indicates a blocked sensing port or a failed internal Bourdon tube

or 8201-026 models

Aprilaire 4851 Relay Els PW 17895 while the large T-handle adjustmentThe Aprilaire 4851 Relay is a high performance Blower Activation Relay engineered specifically for seamless integration with whole house humidification and HVAC systems. This critical component allows your HVAC control board to initiate the furnace blower independently of a heat call, ensuring optimal humidity distribution throughout the living space. Designed as a direct Aprilaire replacement part, it facilitates the necessary electrical handshake