Home -> HVAC RC-112 Thermostat Our Price $174.95 Buy item(s) Used for Two Speed (or two stage) Heat Pumps with auxiliary heat, 3 stage heat, 2 stage cool Energy Efficient Control of auxiliary heating.(EEC can be turned off if not desired) automatic anticipator. Use for two speed heat pumps, two stage heat pumps, Water Furnace heat pumps with Premier control system Terminals: R - Transformer Hot G - Fan O - Energized on Cooling (for reversing valve) B - Energized on Heating (for reversing valve) C - Transformer Common Y1 - Slow Speed or Stage 1 compressor W2 - Auxiliary Heating (stage 2 heat) Y2 - High Speed or Stage 2 Compressor RC-112 Owner's Manual: Download the Owner'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 Indoor Outdoor Temperature Sensor HAI OMNI II Kit HAI OMNI PRO II Kit RC-100 Heat Pump Thermostat RC-80 Thermostat Buy item(s)