Overview
The Dayton 2E246 snap disc thermostat is a bimetallic temperature-sensing control device designed for fan control in HVAC and refrigeration systems. This unit closes its switch contact at 120°F and opens at 110°F, providing automatic fan activation and deactivation based on temperature. Snap disc thermostats deliver reliable temperature control without external power or complex wiring, making them ideal for furnace blowers, air handler fans, and evaporator coil protection.
Key Features
- Fixed setpoint: closes at 120°F, opens at 110°F
- Snap-action bimetallic disc design for reliable switching
- Direct-mount installation on ductwork or coil sensors
- No external power required—fully mechanical operation
- Compact form factor for easy retrofit into existing systems
Technical Specifications
- Close Temperature: 120°F
- Open Temperature: 110°F
- Temperature Differential: 10°F hysteresis
- Control Type: Snap disc bimetallic thermostat
- Mounting: Duct-mounted or surface-mount sensor
- Operating Range: Designed for HVAC and refrigeration service
Typical Applications
- Furnace blower fan control (automatic on/off)
- Rooftop unit condenser and compressor fan regulation
- Heat pump supplemental heat staging
- Air handler unit temperature-dependent fan operation
- Evaporator or condenser coil frost/temperature protection
- Refrigeration cabinet or walk-in cooler defrost control
Compatibility & Replacements
Compatible With
- Standard HVAC/refrigeration ductwork and mounting surfaces
- Low-voltage and line-voltage fan motor circuits
- Single-stage and multi-stage air handlers
- Rooftop units, split systems, and package units
Replaces / Drop-In Replacement For
- Original equipment manufacturer (OEM) snap disc thermostats with 120°F/110°F setpoints
- Direct replacement for Dayton 2E246 units
- Verify compatibility with your system integrator before ordering to confirm setpoint and mounting style requirements.
Works With
- Single-pole single-throw (SPST) switch contacts for direct fan motor control
- 24VAC and line-voltage (120V–600VAC) fan circuits
- Mechanical HVAC control schemes without programmable logic or sensors
- Non-networked temperature-based switching applications
