White-rodgers 1f57-306 Multi-stage 2H/2C Setpoint Thermostat 24V

Product Description

The WHITE-RODGERS 1f57-306 is a multi-stage setpoint thermostat rated for 24-volt systems, designed for two-stage heating and two-stage cooling (2H/2C) applications. It uses a sealed mercury switching mechanism, which provides reliable, vibration-resistant contact closure for accurate temperature control. This thermostat is intended for installation by licensed HVAC technicians in systems that require staged capacity control rather than single-stage on/off switching. The sealed mercury design reduces the risk of contact arcing and supports consistent setpoint accuracy over extended service life.

This thermostat is suited for residential and light commercial HVAC installations where two-stage heating and two-stage cooling equipment is deployed. Typical applications include dual-capacity gas furnaces paired with two-stage central air conditioning systems. It is a hardwired, low-voltage setpoint-style thermostat, not a programmable unit, making it appropriate for straightforward temperature-control scenarios where a fixed setpoint is preferred over scheduling functionality.

Key Features

• Multi-stage control: supports 2-heat and 2-cool staging for capacity-managed HVAC systems
• 24-volt operating voltage compatible with standard low-voltage HVAC control circuits
• Sealed mercury switching mechanism for vibration-resistant, reliable contact operation
• Setpoint-style design provides simple, fixed-temperature control without programmable complexity
• Hardwired low-voltage installation suitable for trade-level service work

Compatibility

Designed as an OEM-style replacement setpoint thermostat for residential and light commercial 2-stage heating and 2-stage cooling low-voltage HVAC systems operating at 24 volts.

Installation Notes

Installation should be performed by a licensed HVAC technician following NEC low-voltage wiring guidelines and local mechanical codes. Disconnect and lock out power to the air handler, furnace, and condensing unit before removing the existing thermostat or making any wiring connections. Note that this unit contains a sealed mercury switch; handle and dispose of it in accordance with applicable federal, state, and local regulations governing mercury-containing devices. Verify that the system control board supports 2H/2C staging before wiring.

Technical Specifications

• Control Stages: 2 Heat / 2 Cool (2H/2C)
• Operating Voltage: 24 volts
• Switch Type: Sealed mercury
• Thermostat Type: Setpoint (non-programmable)
• UPC: 786710000805

Standard Information

• Brand: WHITE-RODGERS
• Manufacturer Part Number: 1f57-306