| Genuine Aprilaire 4851 Blower Activation Relay |
 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. Specifications: -Part 4851 -Initiates HVAC fan operation -Used on humidifiers installed on a heat pump -For humidifiers using automatic digital controls -Fits Aprilaire 500, 600 and 700 series humidifiers Related Products: Aprilaire 500A Humidifier Aprilaire 500M Humidifier Aprilaire 600A Humidifier Aprilaire 600M Humidifier Aprilaire 700A Humidifier Aprilaire 700M Humidifier Price: 31.99 |