Home -> HVAC RC-100 Heat Pump Thermostat Our Price $145.95 Buy item(s) RC-100 Single stage Thermostat for heat pumps.1 stage heat, 1 stage cool. Can be set to heat only or cool only. Automatic anticipator. Use for Heat Pumps. Thermostat can "power steal" for retrofitting heat/cool systems with only 4 wires. Single stage heat pumps with auxiliary heating 2 stage heat, 1 stage cool Energy Efficient Control of auxiliary heat to save energy (EEC can be turned off if desired) Automatic anticipator Use for: water source heat pumps, ground source heat pumps, or air to air heat pumps with electric, hot water, or other source of auxiliary heat Terminals: R - transformer hot G - fan O - energized on cooling (for reversing valve) B - energized on heating (for reversing valve) C - transformer common Y - compressor (heating and cooling) W2 - auxiliary heating (stage 2 heat) X2 - fault indicator LED RC-100 Heat Pump User's Manual: Download The User's Manual Wiring Requirements: Wire thermosat to furnace/air handler as any programmable thermostat, PLUS install a four conductor #22 awg jacketed cable from thermostat to OMNI Controller for Serial Communications Related Items Worth Considering HAI OMNI II Kit HAI OMNI PRO II Kit HAI PC Access Software HAI Web-Link II Buy item(s)