On models equipped with the test feature

Key Benefits Interchangeable Accuracy: Verified ±2% NIST traceable calibration provides reliable performance without the need for on-site calibration tools

and the latest A2L refrigerants

Remote Flame Sensing: Dedicated circuitry for remote flame sense ensures reliable combustion monitoring in demanding burner configurations

Efficient 3-Phase Design: Reduces energy consumption and vibration

Johnson Controls W42AA-1 Humidistat 323269-701 On models equipped with theThe Johnson Controls W42AA 1 Humidistat is a heavy duty, 3 wire humidity controller designed for precision management of both humidifying and dehumidifying equipment. Engineered with a stable 150 strand human hair sensing element, this unit provides superior sensitivity and long term accuracy compared to synthetic alternatives. It operates on line voltage (120 240 VAC) or low voltage circuits, utilizing a Single Pole Double Throw (SPDT) snap acting