507789-02G / 31-5000673-1
Issue 2336
Page 9 of 24
Duct System and Filters
Duct System
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of the supply plenum.
Supply and return duct system must be adequately sized
to meet the system’s air requirements and static pressure
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conditioned areas or 2” minimum in unconditioned areas.
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extend at least 3 ft. from the air handler before turning or
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Filters
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Filter Size – in.
-018, -024, -030
15" x 20" x 1"
-036, -042, -048, -060
18" x 20" x 1"
Table 2. Unit Air Filter Size Chart
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system capacity and performance may be reduced.
The pressure drop may also cause the limit to trip
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to freeze in the summer, resulting in an increase in the
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manufacturer against the data given in the appropriate
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IMPORTANT
Installing Duct System
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handler. If an isolation connector is used, it must be
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Field-Fabricated Return Air Duct Flange For
Horizontal Applications
A return air duct system is recommended, but not factory-
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closet, run a full-size return connection to a location outside
the closet.
BOTTOM OF
CABINET
DUCT
ADAPTER
1−1/2
(38)
”A”
BRAKE DOWN 90 DEGREES
1/4 (6) DIA.
2−HOLES
"A"
1−1/2(38)
3/4
(19)
3/4
(19)
1−1/2
(38)
3/4
(19)
1/2
(13)
3/4
(19)
DUCT
FLANGE
CABINET
DOOR FLANGE
UNIT SIZE
Cabinet and Duct Flange
-018, -024,
-030
-036, -042,
-048, -060
18-3/8"
21-1/2"
Figure 9. Cabinet and Duct Flange
Brazing Refrigerant Lines
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Refrigerant lines must be clean, dry, refrigerant-grade
copper lines. Air handler coils should be installed
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combinations.
Handle the refrigerant lines gently during the installation
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restriction.
Do not remove the caps from the lines or system
connection points until connections are ready to be
completed.
IMPORTANT
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absorb moisture very quickly. It is very important that the
refrigerant system be kept closed as much as possible.
DO NOT remove line set caps or service valve stub
caps until you are ready to make connections.
WARNING