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507787-01C mrcool.com Page 9 of 22
and performance may be reduced. The pressure drop
may also cause the limit to trip more frequently during
resulting in an increase in the number of service
against the data given in the appropriate Product
Service and Application Note ACC002 (August 2000).
handler. If an isolation connector is used, it must be
Field-Fabricated Return Air Duct Flange for
Horizontal Applications
A return air duct system is recommended, but not factory-
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
Refrigerant lines must be clean, dry, refrigerant-grade
copper lines. Air handler coils should be installed
combinations.
Handle the refrigerant lines gently during the installation
restriction.
Do not remove the caps from the lines or system
connection points until connections are ready to be
completed.
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.
charge from only the high side may result in
suction tubing. Application of a brazing torch
to a pressurized system may result in
ignition of the refrigerant and oil mixture.
applying heat.
When using a high pressure gas such as
nitrogen to pressurize a refrigeration or air
conditioning system, use a regulator that
(6.9 to 13.8 kPa).
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