Built-in Humidifier System, 2 Wire
• This system has a humidifier built into its HVAC system and 2 separate hum wires.
• Install the 2 hum wires directly into the relay
• Run the single wire from the relay to the * terminal.
• Nest recommends the White Rogers 90-290Q or similar 24VAC HVAC relay.
Built-in Humidifier System, 1 Wire
• This system has a humidifier built into its HVAC system and only 1 hum wire.
• Connect the hum wire from the built-in system directly to the * terminal.
• No relay is recommended.
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