CACG/CAHG/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
14
P/N 240008108, Rev. G [07/08/10]
Duct Connections
Branch duct and fresh air duct collars can be
att ached to the cassett e chassis by following
the steps below.
NOTICE
Recommendation — no more than
10 feet (3m) of branch duct or fresh air
duct should be installed.
Locate the knock-out holes (
1. Figure
12,
Page 14 ).
NOTICE
Th
e number of knockouts varies with
unit size.
Branch duct knock-outs are 5¼”
(133mm) round.
Fresh air knockouts are:
1¼” x 2½” (32 x 64mm) rectangular
•
on models 9 & 12.
3” (76mm) square on models 24
•
and 36.
Cut the black insulation around the
2.
knock-out ( Figure 13, Page 14 ).
Snip the tabs holding the knock-out in
3.
place ( Figure 13, Page 14 ).
Remove the metal knock-out and the
4.
black insulation behind it.
Att ach the duct collars (fi eld supplied) to
5.
the chassis using self-drilling screws.
Repeat steps above for remaining duct
6.
work.
Knockouts
Figure 12
Fresh Air
Knockout
Fre
F
F
Kn
K
K
Branch Duct Knockout
Cassette 12
Cassette 12
CASSETTE 24 & 36
CASSETTE 24 & 36
Cut insulation and snip out
Figure 13
knockouts