While a C-wire is recommended for continuous backlighting and consistent 24V power

it resets automatically

For efficient moisture management

and reverse cycle setups

If your bolts are corroded or the flange is compromised

MAMAC Systems HU-225-2-VDC Humidity Transducer 30067439-890 While a C-wire is recommendedThe MAMAC Systems HU 225 2 VDC is a professional grade wall mount humidity transducer engineered for precision environmental monitoring in commercial and industrial Building Automation Systems (BAS). This unit utilizes a cross linked bulk polymer capacitive sensing element protected by a proprietary ePTFE (expanded Teflon) filter, ensuring exceptional resistance to contaminants, smoke, and condensing humidity. Technicians can rely on the NIST