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Aprilaire 4851

Blower Relay

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For Aprilaire series 500, 600, and 700 humidifiers that use the Automatic Digital Humidifier Controls (#56 and #58). This device will initiate HVAC fan operation when there is a call for humidity, even when there is no heat call. Use this relay in applications where humidifier operation is required beyond a call for heat, e.g. when installed on a heat pump or during times of the year where there is a need for humidity but not a need for heat.

Note: Aprilaire recommends that a humidifer is plumbed to hot water when using this relay.

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.