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INSTALLATION
MOUNT CONTROL
See FIGURES 2 & 3�
1. Remove front cover by pulling straight out�
2. Position the back plate on the wall and mark the locations for the wire access hole and the
mounting screws� Note: The mounting holes can also be used to secure the back plate to a
standard horizontally mounted junction box�
3. For mounting on drywall, drill two 3/16" dia� mounting holes and a 3/4" opening for the wires�
4. Insert the drywall anchors provided into the mounting holes flush with the wall surface�
5. Run 4-wire cable from the humidifier to the control location�
6. Secure back plate using the two #8 x 1-1/2" screws provided�
7. After connecting the wires, tuck excess wire into the wall and fill the opening with insulating
material� Failure to seal the opening may result in inaccurate operation due to drafts�
FIGURE 2 – DISASSEMBLE CONTROL
RH SETTING LABEL
4
BACK PLATE
FRONT COVER
90-2497
FIGURE 3 – MOUNT BACK PLATE
4-CONDUCTOR WIRE
WIRING
WIRING MODEL 65 WITH APRILAIRE MODEL 400, 500, 600, AND 700 SERIES EVAPORATIVE
HUMIDIFIERS
The Model 65 control requires 24VAC� Drawing power from the HVAC system is the recommended
method for this installation� See FIGURES 4 & 5�
1. Disconnect power to the humidifier and HVAC system�
2. Connect the C and R terminals on the Model 65 to the HVAC or thermostat C and R terminals�
3. Connect Model 65 H terminals to the humidifier solenoid valve control circuit as shown�
4. Snap the front cover onto the back plate� The 4-pin terminal aligns with the terminal block
receptacle on the back plate�
5. Proceed to SYSTEM CHECKOUT on page 9�
MOUNTING HOLES
WIRE ACCESS
OPENING
BACK PLATE
SCREW
ANCHOR
90-2498
5
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