Duct Connections; Bottom Opening Duct Installation - Trane Climate Changer TCFS Nstallation, Operation, And Maintenance

Component Installation Requirements

Duct Connections

All duct connections to the air handler should be installed
in accordance with the standards of the National Fire
Protection Association (NFPA):
• NFPA 90A for installing air conditioning and ventilating
systems other than residence type.
• NFPA 90B for residence-type warm air heating and air-
conditioning systems.
To ensure the highest fan efficiency, duct turns and
transitions must be made carefully, minimizing air friction
losses and turbulence. Proper duct work installation by
such organizations as SMACNA (Sheet Metal and Air
Figure 38. Field-supplied duct connection to air handler bottom supply/return air opening
Typical Trane
air handler base
Field-supplied
rigid duct
3. Bottom of unit base elevation is lower than edge of
duct opening in bottom of unit. During unit installation
on roof curb, either raise field provided duct per Option
A (see Figure 39) or add additional gasket material to
compensate for the offset per Option B (see
Figure 39. Field-supplied duct connection - Option A
Unit wall
Unit floor
Unit base
Gasket
Roof
curb
Building roofing
and structure
may vary per job
Option A
Additional 1/2 inch of duct
length option. Not to scale.
34
Typical Trane
air handler base
Figure 40).
Edge of
supply opening
Supply opening
in floor
0.5
Bottom of unit
base elevation
Field-supplied
duct
Conditioning Contractors National Association, Inc.)
should be adhered to.
See unit submittal documentation for additional duct
mounting information.

Bottom Opening Duct Installation

1. Install gasket to duct flange to ensure air tight seal.
2. Install duct into place underneath framed opening in
unit base per Figure 38. Refer to factory curb layout
provided with unit submittals for duct size and
location.
Field-supplied
rigid duct
Note: Bottom of unit base elevation is 1/2 inch lower than
edge of duct opening in bottom of unit. During unit
installation on roof curb, either raise field-provided
duct or add additional gasket material to
compensate for the 1/2 inch offset.
Figure 40. Field-supplied duct connection- Option B
Unit floor
Unit wall
Gasket
Unit base
Gasket
Roof
Building roofing
curb
and structure
may vary per job
Bottom supply/
return airflow
Edge of
supply opening
Supply opening
in floor
0.5
Additional
1/2 in. gasket
Field-supplied
Bottom of unit
duct
base elevation
Option B
Additional 1/2 inch of gasket
material option. Not to scale.
CLCH-SVX010A-EN