Aprilaire #4851 Blower Activation Relay
For Aprilaire series 500, 600, and 700 humidifiers that use the Automatic Digital Humidifier Controls (# 56 and # 58).
Allows digital control (#58) to turn on system fan when there is a call for humidification (but not heat).
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 humidifier is plumbed to hot water when using this relay.
AirFilters.com
This Aprilaire #4851 Blower Activation Relay is for Aprilaire series 500, 600, and 700 humidifiers that use the Automatic Digital Humidifier Controls (# 56 and # 58). It allows digital control to turn on system fan when there is a call for humidification (but not heat). 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 humidifier is plumbed to hot water when using this relay.
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