Mounting The Controller In A Closet Return Plenum - Aprilaire 8120 Series Installation And Operation Manual

Duct Board Installation
1. Take out the duct board mounting bracket, remove the wall plate from the control and put the
rest of the control in a safe location until after wiring is completed .
2. Cut a 5 . 7 5" x 5 . 2 5" rectangular opening in the return plenum . Save the piece cut out to
insulate the duct board bracket around the controller . The display of the control will run
parallel with the long dimension . DO NOT MOUNT THE CONTROL IN A POSITION WHERE IT IS
FACING DOWN .
3. Use the supplied #8 x 1/2" type 25 pan head screws to mount the control wall plate to the
duct board mounting bracket .
4. Place the bracket in the cut out and seal in place using metal foil tape and/or mastic .
5. Insulate the duct board bracket around the wall plate using the plug cut out of the duct board .
FRESH AIR DUCT
6" MIN
RETURN DUCT
DUCT
BOARD
5-3/4"
BRACKET
5-1/4"
WALL PLATE
#8 PAN HEAD DUCT BOARD
TYPE 25 SCREW RETURN PLENUM
USE CUT-OUT INSULATION
TO INSULATE DUCT BOARD
BRACKET AROUND CONTROLLER
6 English
MOUNT VENT CONTROLLER
SIDE AND TOP ONLY

MOUNTING THE CONTROLLER IN A CLOSET RETURN PLENUM

NOTE: Do not mount directly in the path of the outdoor air . Mount the control where it will
sense the relative humidity of the return air .
1. Remove the wall plate from the control and put the rest of the control in a safe location until
after wiring is complete .
2. Use spacers or brackets to mount the controller to an inside wall surface or return plenum/
duct surface that is at room temperature (i . e . do not mount to supply ductwork or to the air
handler/furnace) to space the wall bracket a minimum of ½" away from the surface .
3. Mount the wall bracket to the surface using #8 screws (field supplied – do not use flat head
screws) and wall anchors (field supplied) if mounting to drywall . Ensure that there is room
for air to flow behind the wall bracket . DO NOT install screws in the wall bracket anywhere
except intended mounting holes.
SPACER (2)
90-2264
WALL PLATE
1/2"
#8 SCREW (2) DO NOT
USE FLAT HEAD SCREWS
90-2278
English 7