Roofcurb; Downflow - Trane Precedent TSCSeries Installation And Maintenance Manual

Table 3. Clearance required from duct to combustible
surfaces
Model Number
T(S/H)C036-60E
THC037-67E
TSC072F
THC072F
TSC090F
TSC092F
THC092E/THC092F
TSC102F
THC102E
TSC120F***A
TSC120F***B
THC120E

RoofCurb

Downflow

The roof curbs for these units consists of a "full perimeter"
enclosure to support the unit just inside of the unit base
rail. The 7½ - 10 ton high efficiency units contain a support
base alignment rail and will extend past the end of the roof
curb as shown in figures below and to the right.
Before installing any roof curb, verify;
• it is the correct curb for the unit,
• it includes the necessary gaskets and hardware,
• the purposed installation location provides the
required clearance for proper operation,
• the curb is level and square. The top surface of the curb
must be true to assure an adequate curb-to-unit seal.
WARNING
Combustible Materials!
Maintain proper clearance between the unit heat
exchanger, vent surfaces and combustible materials.
Refer to unit nameplate and installation instructions for
proper clearances. Improper clearances could result in
combustible materials catching on fire. Failure to
maintain proper clearances could result in death or
serious injury or property damage.
Verify that appropriate materials were used in the
construction of roof and ductwork. Combustible materials
should not be used in the construction of ductwork or roof
curb that is in close proximity to heater elements or any
hot surface. Any combustible material on the inside of the
unit base should be removed and replaced with
appropriate material.
RT-SVX22J-EN
Clearance required from duct to
combustible surfaces (inches)
0
0
0
1
1
0
1
0
1
0
1
1
Step-by-step curb assembly and installation instructions
ship with each accessory roof curb kit. Follow the
instructions carefully to assure proper fit-up when the unit
is set into place.
Note: To assure proper condensate flow during
operation, the unit (and curb) must be level.
If the unit is elevated, a field constructed catwalk around
the unit is strongly recommended to provide easy access
for unit maintenance and service.
Recommendations for installing the Supply Air and Return
Air ductwork joining the roof curb are included in the curb
instruction booklet. Curb ductwork must be fabricated and
installed by the installing contractor before the unit is set
into place.
Note: For sound consideration, cut only the holes in the
roof deck for the ductwork penetrations. Do not cut
out the entire roof deck within the curb perimeter.
Figure 22. View for base to roof curb alignment
THC092-120E on 50" x 84" roof curb
Base Alignment Bracket
Installation
23