White-rodgers 1f89ez0251 Heat Pump Thermostat 2H/1C

Product Description

The WHITE-RODGERS 1f89ez0251 is a non-programmable, low-voltage thermostat designed for residential heat pump systems requiring two-stage heating and single-stage cooling (2H/1C) control. Part of the Blue Series 2 Inch family, it operates on 24 Vac and accepts both battery and hardwire power sources, giving installers flexibility across a range of equipment configurations. The horizontal-mount housing measures 4.735 inches wide, 3.761 inches tall, and 1.496 inches deep. A 2.0-inch display and a simple Home-Sleep-Away preset structure keep operation straightforward without a programming schedule. Licensed HVAC technicians install this thermostat as a functional replacement or new-installation control on heat pump equipment.

This thermostat is suited for residential heat pump installations where a non-programmable control with preset operating modes is preferred over a full scheduling interface. The System Switch offers Heat-Off-Cool-Aux positions, and the fan can be set to Auto or On. Terminal connections include R, C, W2, Y, O/B, G, and L, covering the standard wiring points needed for a two-stage heat pump with reversing valve and auxiliary heat. It does not support millivolt systems, economizer connections, humidity control, dual-fuel control, or 3-wire zone valve wiring.

Key Features

• Non-programmable operation with three preset modes: Home, Sleep, and Away
• Supports heat pump systems configured for 2-stage heat and 1-stage cool (2H/1C)
• Terminal set: R, C, W2, Y, O/B, G, L for full heat pump wiring coverage
• Dual power source compatibility: battery or hardwire at 24 Vac
• System Switch includes Heat-Off-Cool-Aux and fan switch includes Auto-On
• Horizontal-mount, white housing with 2.0-inch display

Compatibility

Designed for residential heat pump systems requiring a 24 Vac, non-programmable thermostat with 2H/1C staging and standard heat pump terminal wiring including O/B reversing valve and auxiliary heat.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with applicable local codes and the equipment manufacturer instructions. Disconnect all power to the air handler or heat pump system before removing the existing thermostat or making any wiring connections. Verify that system voltage is 24 Vac and that the existing wiring matches the supported terminals before mounting. This thermostat is not compatible with millivolt heating systems or 3-wire zone valve applications.

Technical Specifications

• Voltage: 24 Vac
• System Type: Heat Pump
• Stages: 2H/1C
• Power Source: Battery or Hardwire
• Program Style: Non-Programmable, Home-Sleep-Away Presets
• System Switch: Heat-Off-Cool-Aux
• Fan Options: Auto, On
• Terminals: R, C, W2, Y, O/B, G, L
• Display: 2.0 inches
• Width: 4.735 inches
• Height: 3.761 inches
• Depth: 1.496 inches
• Style: Horizontal
• Color: White
• Millivolt Compatible: No
• Humidity Control: No
• Country of Origin: Vietnam

Standard Information

• Brand: WHITE-RODGERS
• Manufacturer Part Number: 1f89ez0251