Installing Indoor Flue Stacks; Installing Rain Hood/Combustion Air Inlet; Installing Flue Stack For Hurricane Applications - Trane Perfomance Climate Changer CSAA Series Installation, Operation And Maintenance Manual

Table 5. Flue connection sizes for gas heat sections
Gas Output (MBh)
200, 320, 360, 560
300
700, 860, 1000
1250, 1500, 1750
2000, 2400

Installing Indoor Flue Stacks

Gas heat sections for indoor air handlers require a field-
engineered and field-installed flue stack. Local codes and
practices vary throughout the country. The engineer
should size the flue based on MBh output, horizontal and
vertical run lengths, type of flue material, NFPA 54 Fuel Gas
Code, and local codes. The flue should be designed for 800
degrees F (430 degrees C). If horizontal runs over 20 feet or
other static-increasing transitions are necessary, a flue
booster fan will be required.
Install according to local codes. See connection sizes in
Table 5.

Installing Rain Hood/Combustion Air Inlet

Rain hoods are only required on an outdoor unit with an
internal vestibule. Depending on unit size, the combustion
air opening will be in the access door or in the side panel.
A unit with an external vestibule has the combustion air
opening in the floor of the vestibule and does not require
a rain hood, unless excessive snowdrifts are expected.
Rain hoods for the combustion air opening ship loose and
must be installed at the job site. The assembly consists of
the hood, butyl tape and number 10 screws.
• Install butyl tape between the hood and the side panel
or door panel (see Figure
Figure 7. Installation of rain hood for combustion air
opening
• Locate the bottom edge of the hood 2 3/8 inches below
the bottom edge of the inlet air opening and center the
CLCH-SVX08C-EN
Flue Size (inches)
8 × 8
9 × 9
12 × 12
10 × 10
14 x 14
7).
Butyl tape
Hood
hood left-to-right over the inlet air opening (see
Figure 8).
• Install the hood to the unit with number 10 screws.
Figure 8. Center inlet air opening
Hinge
side
2 3/8 in.
Installing Flue Stack for Hurricane
Applications
Figure 9. Flue stack installation for hurricane
applications
#10 x 3/4-in. self-drilling
sheet metal screws
Attach the gas heat flue duct
to the L angles on both sides
Note:
When installing flue, leave enough clearance to avoid roof's edge and anything above the roof.
Installation
Access door
Rain hood
Airflow
Combustion
air opening
Center hood left-to-right
over opening
See note
Gas heat flue
L bracket
Right side view
15