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Aprilaire #4851 Blower Relay

Aprilaire #4851 Blower Relay



The Aprilaire 4851 is the correct replacement for the Aprilaire 500, 600, & 700 Series Humidifiers.  The Aprilaire 4851 Humidifier Blower Activation Relay allows the humidifier to energize the HVAC blower on a call for humidity where the humidifier is no longer dependent on a call for heat. The Aprilaire Blower Activation Relay will deliver the comfort and protection needed for controlled humidification. It is highly recommended to use this Aprilaire 4851 Relay if your humidifier is installed on a heat pump or during certain times of the year where there is a need for humidity, but not heat.

Aprilaire Part 4851 - Blower Activation Relay specifications:
  • 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
  • Aprilaire advises that you make sure your humidifier is plumbed to hot water when using this blower activation relay. This replacement is recommended for humidifiers that run in conjunction with the heating system in your home, particularly during the winter months. This Aprilaire 4851 humidifier relay fits all 500, 600 and 700 series humidifiers that use the automatic digital humidifier controls (#56 and #58).

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