Home -> HVAC RC-122 Thermostat Our Price $174.95 Buy item(s) Two Stage heating and cooling systems (Not heat pumps) 2 stage heat, 2 stage cool Energy Efficient Control of second stage (EEC can be turned off if not desired) Automatic anticipator Use for Forced Air systems with two speed furnace, Two Speed air conditioner, Two Stage furnace and/or two stage air conditioner, electric, gas, oil or other fuel. R - Transformer Hot G - Fan Y2 - Second Stage Cooling C - Transformer Common Y1 - 1st Stage Cooling W1 - 1st Stage Heating W2 - 2nd Stage Heating RC-122 Owner's Manual: Download Installation 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-112 Thermostat RC-80 Thermostat Buy item(s)