Amana GUI Installation Instructions Manual page 21

Horizontal Installations
Filter(s) must be installed external to the furnace casing.
Using a central return with filters installed in the duct
behind the return air grille allows filters to be replaced by
just removing the grille. This prevents having to go into
the attic or crawl space when a filter has to be changed.
Refer to the preceding chart on Recommended Minimum
Filter Sizes. (Figure 25)
Counterflow Installations
A filter rack is shipped with the furnace. To use this rack,
proceed as follows:
Figure 28
Furnace Mounted Filter Rack
1. Center the filter rack over the plenum flange and
push down firmly (Figure 28). Since the return air
plenum will need to be attached later, do not screw
the filter rack down.
2. Install the return air plenum on the furnace. For
proper filter performance, the sides of the plenum
must be at least as tall as dimension "A" shown in
Figures 29 and 30.
Optional
Access
Door
Figure 29
NOTE: For easier filter inspection and replacement, the
installer may wish to provide a removable panel in the
front of the return air plenum.
To prevent personal injury, use only blunt
pointed screws to attach the plenum to
the furnace and filter rack. Screws should
not be placed where they could interfere
with filter replacement.
Siz e_Air
F low
045_30
070_30
070_40
090_30
090_50
115_40
115_50
140_50
3. With the air flow direction arrow pointing toward the
furnace, insert the filters from the left side of the
blower. Starting with the right filter, push the filter into
the plenum so the bottom of the filter fits into the filter
Return Air
rack and the upper edge rests against the side of the
plenum. Repeat with the left filter (Figure 29).
"A"
Other Filter Options
Min
External filter grilles may be used instead of the filter rack.
21
CAUTION
Dimension "A", M inimum R ecommended
Inches F ilter Siz es, Inches
F iberglass
T hrow aw ay P erm.
T hrow aw ay
15-1/2 8 (2) 16x 20x 1
15-1/2 8 (2) 16x 20x 1
19-3/4 8 (2) 20x 20x 1
14-1/4 13 (2) 16x 20x 1
24-1/4 13 (2) 25x 20x 1
17-3/4 11 (2) 20x 20x 1
23-1/2 11 (2) 25x 20x 1
23-1/2 11 (2) 25x 20x 1
Figure 30
Counterflow Furnaces
P ermanent
(2) 10x 20x 1
(2) 10x 20x 1
(2) 10x 20x 1
(2) 15x 20x 1
(2) 15x 20x 1
(2) 15x 20x 1
(2) 15x 20x 1
(2) 15x 20x 1