Page 8
FIGURE 7
G23 UNIT
RETURN AIR
PLENUM
PROPERLY
SIZED FLOOR
OPENING
BOTTOM RETURN AIR APPLICATION
Side Return Air Applications
For installations where the return air is taken from a return
air drop, unit may be installed using either the left or right
side of furnace.
For side return air applications, cut furnace cabinet at
maximum dimensions given on page 2. Embossed cor
ners are provided on both cabinet sides for return air
opening location.
Filters & Optional Filter Assembly
This unit is not equipped with a filter. Filter racks and reus
able foam filters are available from Lennox in single kits
(44J20 for 14 x 25 filters; 44J22 for 16 x 25 filters; 44J21
for 20 x 25 filters) or 10pack kits (66K61 for 14 x 25 filters;
66K63 for 16 x 25 filters; 66K62 for 20 x 25 filters).
A filter
must be in place any time the unit is in operation.
Bottom Return Air Applications
1 - Remove blower access panel.
2 - Install filter clips, provided with unit, by slipping
folded section of clip on edge of bottom opening. See
figure 8.
3 - Place filter in bottom of blower compartment beneath
rear filter clip. Press down on filter sides. Filter clips
flex allowing filter to snap into place.
4 - To remove filter, press clip and pull filter up and out.
Side Return Air Applications
An external filter rack, ordered separately, is available
from Lennox.
FIGURE 8
BOTTOM RETURN FILTER INSTALLATION
FURNACE
BASE BOTTOM
REAR FILTER
CLIP
RETURN AIR OPENING
SIDE FILTER
CLIPS (2)
FURNACE
FRONT
FURNACE
BACK
1 - Align filter rack opening with the inside edge of the
side return opening. Bottom of rack should be
approximately 1 inch (25.4mm) from the bottom and
3 inches (76mm) from the front of the unit.
2 - Screw filter rack into place with the six self drill, self
tap screws provided in the kit. See figure 9.
3 - Push filter door pins through the two holes in filter
door from the inside of the uchannel. See figure 10.
4 - Position filter door on end of filter so that the thumb
tab side of the filter door is away from the furnace.
Squeeze thumb tabs to secure filter to door.
FIGURE 9
SIDE RETURN FILTER INSTALLATION
(Inches-mm)
RETURN
AIR OPENING
1-15/16 in.
(49)
BLOWER DECK
15/16 in.
(24)
CABINET BASE BOTTOM
RETURN AIR PLENUM SIZE
12-3/4 in. X 23-1/2 in. (324 X 597)
for 14 in. Filter
14-3/4 in. x 23-1/2 in. (375 x 597)
for 16 in. filter
18-3/4 in. x 23-1/2 in. (476 x 597)
for 20 in. Filter
12 in. (305) for
14 in. Filter
14 in. (356) for
16 in. filter
18 in. (457) for
20 in. Filter