Blue (B): Used for cooling mode in heat pump systems or as the common return, often linked to the C or OB terminal. Connecting the Thermostat to the HVAC System With the power off, carefully remove the old thermostat and label each wire with its corresponding terminal to avoid confusion during the hookup.
Essential Safety Measures for 6 Wire Thermostat Installation
This specific configuration is common in setups that include separate stages of heating and cooling, or systems that integrate humidifiers, ventilators, and multi-stage heat pumps. Locate the thermostat wiring diagram specific to your new device, as variations between manufacturers can affect terminal assignments.
Standard Color-Coded Functions Red (R): The 24-volt power supply from the transformer, typically connected to the RC terminal. Orange (O): Manages the reversing valve for heat pump systems, typically connecting to the O/B terminal to shift between heating and cooling modes.
H3: Essential Safety Tips for Handling 6 Wire Thermostat Installations
Green (G): Controls the blower fan, attached to the G terminal. Consulting the manufacturer’s wiring diagram resolves ambiguities and ensures compatibility with niche configurations such as multi-stage heat pumps or systems with integrated humidification controls.
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