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INSTALLING DUCT SYSTEM
Connect supply air duct to the flange on top of the air han-
dler. If an isolation connector is used, it must be nonflam-
mable.
FIELD-FABRICATED RETURN AIR DUCT FLANGE
FOR HORIZONTAL APPLICATIONS
A return air duct system is recommended, but not facto-
ry-provided. If the unit is installed in a confined space or
closet, run a full-size return connection to a location out-
side the closet.
Cabinet and Duct Flange
CABINET
DOOR FLANGE
1−1/2
(38)
DUCT
FLANGE
3/4
(19)
3/4
(19)
1−1/2(38)
BRAKE DOWN 90 DEGREES
1/2
(13)
UNIT SIZE
-018, -024,
-030
-036, -042,
-048, -060
FIGURE 13. Cabinet and Duct Flange
Brazing Refrigerant Lines
Refrigerant lines must be connected by a qualified techni-
cian in accordance with established procedures.
IMPORTANT
Refrigerant lines must be clean, dry, refrigerant-grade
copper lines. Air handler coils should be installed
only with specified line sizes for approved system
combinations.
Handle the refrigerant lines gently during the installation
process. Sharp bends or kinks in the lines will cause a
restriction.
Do not remove the caps from the lines or system
connection points until connections are ready to be
completed.
3/4
(19)
BOTTOM OF
CABINET
DUCT
ADAPTER
3/4
(19)
"A"
1−1/2
1/4 (6) DIA.
(38)
2−HOLES
"A"
18-3/8"
21-1/2"
Polyol ester (POE) oils used with HFC-410A refrigerant
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.
Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing torch
to a pressurized system may result in ignition
of the refrigerant and oil mixture. Check the
high and low pressures before applying heat.
When using a high pressure gas such as
nitrogen to pressurize a refrigeration or air
conditioning system, use a regulator that can
control the pressure down to 1 or 2 psig (6.9
to 13.8 kPa).
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing operations.
Perform operations only in well-ventilated areas.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and flux.
To prevent the build-up of high levels of nitrogen when
purging, it must be done in a well-ventilated area. Purge
low-pressure nitrogen (1 to 2 psig / 6.9 to 13.8 kPa)
through the refrigerant piping during brazing. This will
help to prevent oxidation and the introduction of moisture
into the system.
Page 9
WARNING
WARNING
WARNING
CAUTION
IMPORTANT
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