Model 300 Humidifier Installation Instructions READ AND SAVE THESE INSTRUCTIONS 1
TABLE OF CONTENTS SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 AIR DISTRIBUTION AND EVAPORATIVE CAPACITY . . . . . . . . . . . . . . . . 5 LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Unit . . . . . . . . . . . . . . . . . . . . . . . . . .
LOCATION UNIT Locate the unit close to the drain and where temperatures do not reach freezing such as a laundry room, basement, utility closet, etc. The unit is rated for 70 F; intake air temperatures below this will affect unit performance (see page 5). Provisions should be made for unit maintenance and service. DISCHARGE GRILLE Select a standard grille size with free area of at least 50 square inches. The grille or baseboard diffuser must be on an inside wall.
To install parallel to joist, attach the angle supports to the middle holes in the housing with the #8 x 1/2" screws provided. If distance between joists is less than 14.5", top mounting holes must be used. Using the hole spacing guide in FIGURE 4, attach the joist brackets in a parallel manner so the bracket edges are approximately 15 inches apart, as shown in FIGURE 2, with the #8 x 1" screws provided.
AIR DISTRIBUTION AND EVAPORATIVE CAPACITY Check all state and local codes and proper design regarding air distribution systems. Provision should be made for air circulation back to the unit. Where doors are normally closed, the door should have a 1/2" minimum undercut or have a grille installed for proper air circulation. The Model 300 has the capacity to deliver 250 CFM at 0.1 inches of water gauge external resistance equivalent to 80 effective feet of duct length.
PLUMBING Heat for evaporation is obtained from hot water. Minimum water temperature to the humidifier should be 120°F and maximum 140°F. It will be necessary to blend hot and cold water whenever water temperature exceeds 140°F. (Tankless domestic water systems may have water temperatures in excess of 140°F.) Be sure that the water heater has sufficient capacity and recovery rate to supply a minimum of 6 gallons per hour of hot water to the humidifier. Tankless water heaters may not activate at 6 GPH.
WIRING POWER FIGURE 5 – WIRING The Model 300 is prewired internally and equipped with a 120 VAC cord and plug. POWER CORD HUMIDITY CONTROL HUMIDISTAT The Aprilaire® Model 65 Humidifier Control is designed for 24 VAC to control humidification equipment. For instructions on how to install and operate the humidistat, see Model 65 Humidifier Control Installation Instructions provided.
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