4" OD copper). 18AWG low voltage wire. Bypass duct (bypass units only). Model 50 or 4851 relays (to be used with manual humidistats only). *See Installation Instructions for more information.
20 Mar 2015
THESE INSTALLATION INSTRUCTIONS ARE FOR THE APRILAIRE HUMIDIFIER CONTROL ONLY! For Aprilaire® Humidifier installation, Use setting “A" for. Model 400 humidifiers. Humidifier Controls that come with a Model 400 humidifier will be pre-set to setting “A". RETURN. DUCT. APRILAIRE. FRESH AIR. INTAKE.
evaporator will be most efficient when installed with the colored spot at the top. Make sure the entire Water Panel is enclosed in the scale control insert. Evaporation Check — The evaporative capacity of the Aprilaire humidifiers (excluding the models. 400, 445 & 448) can be checked by determining the time it takes to fill a
ARE FOR THE APRILAIRE® AUTOMATIC DIGITAL. HUMIDIFIER CONTROL installation, follow Aprilaire Humidifier Installation Instructions. Use Setting “A" for Model 400 Series humidifiers in areas with very hard water. The indicator will light after 150 hours of humidifier operation. Use Setting “B" for Model 400 Series,.
ATTENTION INSTALLER: MODEL 400 SERIES HUMIDIFIER. The Model 400 and 400M Aprilaire can be installed on either the supply or return plenum of a forced air handling system and is easily reversible for installation with right hand or left hand bypass duct connections. The humidifier dimensions and serviceability.
View and Download Aprilaire 400 instructions and installation instructions online. AUTOMATIC HUMIDIFIER. 400 Humidifier pdf manual download.
The Model 400A Aprilaire can be installed on either the supply or return plenum of a forced air handling system and is easily reversible for installation with right hand or left hand bypass duct connections. The humidifier dimensions and serviceability must be considered when selecting the best location for the humidifier.

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February 2018