Aprilaire 4851 Relay 320788-704 Does this thermostat require a

Does this thermostat require a common wire (C-wire) for installation

preventing "nuisance" cycling of dangerous conditions

these part numbers refer to the same technical component

providing technicians with a versatile solution for legacy furnace repairs

Mechanical Versatility: The 35 lb-in torque rating and non-spring return operation provide stable positioning for specific HVAC zones and air handling units

Aprilaire 4851 Relay 320788-704 Does this thermostat require aThe Aprilaire 4851 Relay is a high performance Blower Activation Relay engineered specifically for seamless integration with whole house humidification and HVAC systems. This critical component allows your HVAC control board to initiate the furnace blower independently of a heat call, ensuring optimal humidity distribution throughout the living space. Designed as a direct Aprilaire replacement part, it facilitates the necessary electrical handshake