Step 2—Install Air Cleaner Filter Gage
Blower suction will create a slight vacuum so air will flow into the
bottom of the filter gage and through its chamber—lifting the ball
in the gage. As the filter media in the air cleaner becomes dirty, the
increase in vacuum and resulting airflow will lift the ball propor-
tionally. When the ball reaches the top arrow, the air cleaner media
should be replaced.
The air cleaner filter gage should be installed in a convenient
location on a vertical duct surface between the air cleaner and the
furnace blower or in the furnace casing of the blower compart-
ment.
1. Drill a 3/8-in. hole in duct work or casing. Place spring gage
holder in hole. (See Fig. 4.)
2. Insert gage mounting stud through hole in condition indicator
card and then in spring gage holder so stud projects into duct
or casing. (See Fig. 4.)
3. Adjust airflow gage by rotating range adjustment plug until
ball hovers at tip of lower arrow. (See Fig. 4.)
When the air cleaner media begins to become clogged and dirty,
the ball will move up the gage. When the ball is in the red range
(shown on the condition indicator card), the air cleaner should be
serviced.
Step 3—Install Filter Media in Air Cleaner Cabinet
NOTE:
These instructions should also be followed when the filter
gage indicates the filter media needs to be changed.
1. Loosen two thumb screws on front access panel and remove
panel. Slide filter media frame assembly from air cleaner
cabinet.
2. Remove filter media from carton. Ensure there are no holes or
tears in filter media.
Fig. 2—Dimensional Drawing
A90295
13
⁄
16
″
9
1
⁄
4
″
19
13
⁄
16
″
3
15
⁄
16
″
7
3
⁄
4
″
3
3
⁄
16
″
5
5
⁄
8
″
3
15
⁄
16
″
7
7
⁄
8
″
5
⁄
16
″
25
11
⁄
16
″
23
5
⁄
16
″
21
1
⁄
2
″
1
1
⁄
8
″
6
″
21
7
⁄
16
″
19
13
⁄
16
″
1
⁄
2
″
1
⁄
2
″
KNURLED THUMBSCREW
WITH .130 IN. DIA STARTER
POINT.
13
⁄
16
″
Fig. 3—Typical Installations (Upflow Furnaces)
A90294
AIR FLOW
FURNACE WITH
TRANSITION
FURNACE NO
TRANSITION
FURNACE WITH
TURNING VANES
AIR FLOW
AIR FLOW
2
