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FILTER INSTALLATION - UPFLOW
All applications require the use of a filter. A high velocity filter
and retainer are provided for field installation on P*UR &
G9T-UP models. FG9-UP models must have a field-supplied
filter and mounting hardware.
Internal Installation
1.
Select desired filter position (left/right side, and/or bot-
tom). Remove the corresponding cabinet cut-outs per
instructions provided.
2.
Install snap-in retainer clips into the corresponding slots
from the outside rear of the cabinet (Refer to Figure 3.)
To prevent cabinet air leaks, install snap-in plugs (pro-
vided) into the unused slots at the outside rear of the
cabinet.
FURNACE
(REAR CABINET)
RIGHT
SIDE
SLOTS
BOTTOM SLOTS
CABINET
SLOT
FILTER SUPPORT
Furnace Filter Slot Locations
FIGURE 3 :
POSITION WIRE RETAINER
(IF PROVIDED) UNDER FLANGE
CLIPS
RIGHT SIDE
INSTALLATION
SHOWN
Filter Retainer Placement
FIGURE 4 :
3.
Install the wire retainer inside the cabinet (if provided).
Insert the open ends of the wire retainer into the clip
loops at the rear of the blower compartment. The retainer
wire should pivot freely like a hinge, on the clips at the
rear of the cabinet. (Refer to Figure 4).
8
LEFT
SIDE
SLOTS
PLUG UNUSED
CABINET SLOTS
WITH PLUGS
IF FILTER
PROVIDED
FURNACE
FRONT
4.
Install the filter(s) if provided. Cut filter if necessary to
match air opening in cabinet. Filter should extend
beyond opening edge as much as possible to prevent air
from bypassing the filter. DO NOT remove stiffening rods
from inside the filter. Shorten the rods, if necessary, to
match final filter size.
5.
Position the filter between the wire retainer and the cabi-
net wall (or floor) so it completely covers the cabinet air
opening and secure the filter in place at the front of the
cabinet by fastening the closed (looped) end of the
retainer wire under the flanged edge of the cabinet.
When properly installed the filter should fit flush with all
four sides of the cabinet wall.
NOTE: Air velocity through throw-away type filters may not
exceed 300 feet per minute. All velocities over this require the
use of high velocity filters.
Side Return - External Filter
Locate and knock out the square corner locators. These indi-
cate the size of the cutout to be made in the furnace side
panel. Refer to Figure 5.
CORNER
MARKINGS
Side Return Cutout Markings
FIGURE 5 :
Install the side filter rack following the instructions provided
with that accessory. If a filter(s) is provided at another loca-
tion in the return air system, the ductwork may be directly
attached to the furnace side panel.
An accessory filter rack (1SR0302BK) is available for mount-
ing the filter external to the cabinet.
NOTE: Some accessories such as electronic air cleaners and
pleated media may require a larger side opening. Follow the
instructions supplied with that accessory for side opening
requirements.
All installations must have a filter installed.
035-17477-001 Rev. A (801)
FRONT OF
FURNACE
Unitary Products Group
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