Schneider Electric (Barber Colman) HC-101 Thermostat

The Schneider Electric (Barber Colman) HC-101 Room Humidistat is a legacy-standard mechanical humidity controller engineered for precise two-position control of humidification and dehumidification systems. Designed to handle both low and line voltage applications, this unit features a robust nylon ribbon sensing element that ensures reliable stability and a fast response to changes in relative humidity (RH). With a versatile SPDT snap-acting switch, the HC-101 effectively manages commercial HVACR components including solenoid valves, compressors, and fan relays across a broad 10 to 90% RH control dial range. This model serves as the primary technical humidistat replacement for obsolete series such as the HC-101-108, HC-101-770, and HC2-101-109. The NEMA 1 rated enclosure is finished in beige plastic with a professional brushed bronze Barber Colman insert, making it a drop-in solution for contractors maintaining existing environmental control systems.

Key Benefits for HVACR Professionals

• Direct Retrofit Compatibility: Engineered as a high-reliability replacement for Barber Colman HC-101-108 and HC2-101 field units.
• Multi-Voltage Flexibility: Supports 24 VAC, 120 VAC, and 240 VAC circuits, allowing for a single part to stock for diverse job site requirements.
• Precision Sensing: Utilizes a high-sensitivity nylon sensing element with a fixed 5% RH differential to prevent equipment short-cycling.
• Industry Standard Enclosure: Features a NEMA 1 beige plastic housing suitable for surface mount or flush switch box installation.
• Universal Switch Action: SPDT electrical switch configuration enables seamless control for both humidifying and dehumidifying sequences.

Common Questions

Can the HC-101 be used for both low voltage and line voltage systems?
Yes, the HC-101 is a two-position humidistat rated for operation at 24V, 120V, and 240V AC. It is commonly utilized in building automation systems and standalone mechanical HVAC setups.

How do I convert the HC-101 to a concealed adjustment model?
The HC-101 package includes a blank cover insert and a 5/64" Allen head screw. By removing the dial knob and installing the blank insert, the relative humidity setpoint can be protected from unauthorized tampering.

Does this unit require a separate power supply for the sensing element?
No, the Schneider Electric HC-101 utilizes a mechanical nylon ribbon that reacts physically to moisture levels, operating as a non-powered sensing component within the control circuit.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.