Installation
12
CLCH-SVN05C-EN
9. Complete all ductwork, piping, and electrical
connections only after mounting the unit. Refer to unit
submittals.
Pipe Cabinet Roof Curb
Pipe cabinets ordered from Trane for field installation
require special attention with regard to joining the unit
roof curb and pipe cabinet roof curb. A good joint will
prevent any water management problems within the pipe
cabinet.
The pipe cabinet roof curb should be three-sided and have
dimensions as shown in the figure below, a top view of the
pipe cabinet roof curb, and
Table 2
. Dimension ‘L’ is from
the outside of the unit roof curb to the outside of the pipe
cabinet roof curb. Dimension ‘X’ is the outside-to-outside
width dimension of the pipe cabinet roof curb. Dimension
‘Z’ locates the pipe chase roof curb along the unit roof curb
in the direction of airflow. This measurement is from the
outside of the unit roof curb to the outside of the pipe
cabinet roof curb.
The basic formula becomes:
•
Z = LDS – 3 for CSAA sizes 3 to 50
•
Z = LDS - 3.5 for CSAA sizes 57 to 120
•
Z = LDS - 3.5 for all PSCA sizes
where LDS is the total length of the sections downstream
of the pipe cabinet.
Specialty Roof Curbs
Units to be mounted on a roof curb not supplied by Trane
require special attention.
Center the unit base on the roof curb as shown in the figure
below.
Figure 16.
Top view of unit and pipe cabinet roof curb
Unit Roof Curb
Pipe Chase
Roof Curb
Table 2.
Pipe cabinet roof curb dimensions
Unit size
L dimension
Reduced
Standard
Extended
3 to 50 CSAA
26.00
38.00
50.00
57 to 120 CSAA
26.50
38.50
50.50
All PSCA
36.50
38.50
50.50
All unit sizes
X dimension
Reduced
Lp + 5
Standard
Lp + 5
Extended
Lp + 5
Note:
Lp is the sum of the section length(s) covered by
the pipe cabinet. Refer to submittal.
Figure 17.
Cross section
Note:
For PSCA, the base rail height is 7.25 in. Verify the base rail width
in unit submittal.
1.4 in.
2.88 in. - sizes 3-50
3.88 in. - sizes 57-120
6.0 in. - sizes 3-120
