STEP 4: Determine Location for Humidifier Control and Mount Control
Humidifier Control must be mounted on the Return Duct, at least
6 inches upstream of the following (see Figure C):
•Humidifier
•Humidifier Bypass Ductwork (if applicable)
•Fresh Air Intake Ductwork (if applicable)
Ambient operating temperature of the Humidifier Control is to be from 20°F to 120°F to prevent damage to the control display.
DUCT (SHEET METAL) MOUNT:
After location for Control is selected, drill a 3/4 inch hole for the RH sensor (the RH sensor extends from the back of the Humidifier Control).
Use 2 sheet metal screws, 3/4 inch long (not provided), to mount the Humidifier Control. Use the mounting slot to level the Control, then secure the Control with the second sheet metal screw.
Make sure the Humidifier Control sensor gasket is seated tightly around the drilled hole. Do not install Control without gasket.
DUCT (FIBER BOARD) MOUNT:
RETURN
DUCT
6" MIN.
HUMIDIFIER
CONTROL
FRESH AIR
INTAKE
BYPASS
CONNECTION
Figure C
HUMIDIFIER
COIL
After location for Control is selected, cut a rectangular hole in the duct board, no smaller than
Cut a rectangular piece of sheet metal to fit behind the hole in duct board for mounting the Humidifier Control.
Drill a 3/4 inch hole for the RH sensor (the RH sensor extendsfrom the back of the Humidifier Control) into the sheet metal plate.
Use 2 sheet metal screws, 3/4 inch long (not provided), to mount the Humidifier Control.
Make sure the Humidifier Control sensor gasket is seated tightly around the drilled hole. Do Not Install Control Without Gasket.
Secure the sheet metal plate, with the Humidifier Control mounted, inside the duct (see FigureD).
CONTROL REPLACEMENT:
When replacing an existing control, the duct opening left by the removed control must be covered completely. Locate and install the new control as instructed previously in Step 4.
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