White-Rodgers 1C21-101 T-stat

Experienced HVAC contractors understand the value of reliability and simplicity in field replacements. The White-Rodgers 1C21-101 is a robust 24V single stage cooling-only thermostat designed for straightforward, snap-action performance. This mechanical low voltage thermostat features a vertical orientation and a rugged bi-metal sensor, making it a dependable choice for managing single stage cooling systems without the complexity of digital programming. Its mercury-free design and wide temperature control range of 50°F to 90°F ensure it meets modern environmental standards while providing precise environmental control. Built by White-Rodgers (an Emerson brand), the 1C21-101 is an ideal low voltage room thermostat for commercial and residential applications where "cool only" operation is required. The unit is hardwired and compatible with standard 24VAC systems, utilizing R and Y terminals for easy integration into existing cooling circuits.

• Snap-action mechanism provides positive contact for consistent cooling system cycles.
• Mercury-free construction offers a safe and compliant solution for modern HVAC retrofits.
• Simple analog interface is easy for end-users to operate, reducing unnecessary service calls.
• Universal Compatibility: Works seamlessly with most 24V cooling systems and includes an adapter plate for replacing various thermostat footprints.
• Hardwired reliability: Eliminates the need for battery replacements in critical cooling applications.

Is this thermostat compatible with a heat pump?
The 1C21-101 is specifically designed as a cool only thermostat. It is not compatible with heat pumps or heating-only systems, as it lacks the necessary circuitry and terminal designations for heat stages.

What is the differential for this unit?
This single stage square t-stat features a fixed 4°F cooling differential, which prevents short-cycling and helps extend the life of the compressor.

Does it require a common (C) wire?
No, this mechanical thermostat is a 2-wire (R, Y) device and does not require a common wire for operation, making it excellent for older wiring configurations.

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.