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F35F Expandapac™ MEDIA AIR CLEANER
68-0178—2
7
Fig. 13. Typical use of duct offset to
make room for media air cleaner.
INSTALLATION AND CHECKOUT
When Installing this Product…
1. Read these instructions carefully. Failure to follow them
could damage the media air cleaner or cause a
hazardous condition.
2. Check the ratings given in the instructions and on the
media air cleaner to make sure the product is suitable
for your application.
3. Installer must be a trained, experienced service
technician.
Remove Furnace Filter and
Clean Blower Compartment
Before starting the installation, remove and discard the existing
furnace filter (if used). Thoroughly clean the blower
compartment. If possible, power vacuum the ductwork to
remove accumulated dust in an occupied home or remove
construction dirt in a new home. The media air filter cannot
remove dirt that has settled in the blower compartment and
distribution ducts.
Install the Cabinet
The following procedure describes a typical side installation
on an existing highboy furnace. Alternate procedures are
noted as appropriate. Other changes in installation
procedures may be necessary to complete your installation.
Review the Installation Plan
Temporarily place the cabinet on the floor, oriented as it will
be when installed. Measure to make sure the plan allows
adequate clearance (at least 26 in. [660 mm]) for easy
removal and replacement of the filter.
M948A
LESS
THAN
7 in.
(178 mm)
OFFSET
AT LEAST
7 in.
(178 mm)
1
1 REQUIRED TURNING VANES HELP DISTRIBUTE AIRFLOW EVENLY.
Make sure that shop-fabricated sheet metal components,
such as turning vanes, are available.
Fasten the Cabinet to the Furnace
Align the cabinet with the return air opening. Place blocks under
the cabinet, as necessary, to make sure the unit is seated
securely. Create an opening in the furnace to match the cabinet
opening. Attach the cabinet securely to the furnace. Attach the
unit directly or fit a starting collar in the furnace opening. Either
drill holes and fasten with sheet metal screws or rivets, or use
slip joints. If you are drilling holes, use a locking pliers to help
hold the unit in place during drilling.
Install Turning Vanes
Install turning vanes to help distribute air equally over the full
surface of the upstream side of the media. Install the vanes
whenever an abrupt 90 degree elbow is installed directly
against the media air cleaner cabinet.
Fasten Cabinet to Ductwork
Fasten the side of the cabinet to the ductwork using sheet
metal screws, rivets, or slip joints, as appropriate.
Connect Ductwork
Connect the vertical duct section to the elbow. If the vertical
drop of the duct is less than 7 in. (178 mm) from the side of
the furnace, shorten the horizontal trunk or attach an offset
fitting to the elbow. See Fig. 13. When ductwork is properly
aligned, connect the vertical duct to the horizontal trunk.
Seal Joints
Seal all joints in the return air system between the media air
cleaner and the furnace to prevent dust from entering the
clean airstream.
Assemble Expandapac Media Filter
1. Open the new media filter; expand it and set it upright
on a flat surface.
2. Insert one end panel tab into the retainers on the frame.
Fold in the end panel flanges and push the tab
completely in, making sure the end panel flanges are
inside the frame flanges. See Fig. 14.
3. Repeat step 2 on the opposite corner.
4. Flip over the assembly and repeat steps 2 and 3 on the
remaining two corners.
5. Lay the filter assembly down flat so the arrows point up.
Insert the combs as shown in Fig.15, aligning them with
the notches in the end panel flanges. Make sure the
combs are inserted completely.