Installation Manual

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Humidifier Configurations

Stand Alone Humidifier, 1 Wire

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• This system has a humidifier that is separate from the HVAC system.

• Install the hum wire directly into the * terminal.

• Correctly ground the other wire from the Humidifier.

• No relay is recommended.

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Stand Alone Humidifier, 2 Wire

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• This system has a humidifier that is separate from the HVAC system.

• 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.

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