Installation; Roof Curb And Ductwork; Pitch Pocket Location - Trane IntelliPak 2 Series Installation, Operation And Maintenance Manual

Installation

Roof Curb and Ductwork

The roof curbs consist of two main components: a
pedestal to support the unit condenser section and a
"full perimeter" enclosure to support the unit's air
handler section.
Before installing any roof curb, verify the following:
• 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.
Step-by-step curb assembly and installation
instructions ship with each Trane accessory roof curb
kit. Follow the instructions carefully to assure proper
fit-up when the unit is set into place.
N N o o t t e e : : To assure proper condensate flow during
operation, the unit (and curb) must be as level as
possible. The maximum slope allowable for
rooftop unit applicationsexcluding Steam Heat
Units, is 4" end-to-end and 2" side-to-side. Units
with steam coils must be set 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.
N N o o t t e e : : 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.

Pitch Pocket Location

The location of the main supply power entry is located
at the bottom right-hand corner of the control panel.
illustrates the location for the electrical entrance
through the base in order to enter the control panel. If
the power supply conduit penetrates the building roof
beneath this opening, it is recommended that a pitch
pocket be installed before the unit is placed onto the
roof curb.
RT-SVX24Q-EN
The center line dimensions shown in the illustration
below indicates the center line of the electrical access
hole in the unit base when it is positioned on the curb,
±3/8 inch. The actual diameter of the hole in the roof
should be at least 1/2 inch larger than the diameter of
the conduit penetrating the roof. This will allow for the
clearance variable between the roof curb rail and the
unit base rail illustrated in
The pitch pocket dimensions listed are recommended
to enhance the application of roofing pitch after the
unit is set into place. The pitch pocket may need to be
shifted as illustrated to prevent interference with the
curb pedestal.
Figure 17. Solid flow baffle wall installation for non-
Trane roof curbs
Return Fan
Roof Curb
Flow Baffle Return Airflow
If a Trane Curb Accessory Kit is not used:
• The ductwork can be attached directly to the unit
bottom, around the unit supply and return air
openings. Be sure to use flexible duct connections
at the unit.
• For "built-up" curbs supplied by others, gaskets
must be installed around the curb and the supply
and return air opening perimeters.
• If a "built-up" curb is provided by others, it should
NOT be made of wood.
• If a "built-up" curb is provided by others, keep in
mind that these commercial rooftop units do not
have base pans in the condenser section.
• If this is a REPLACEMENT UNIT keep in mind that
the CURRENT DESIGN commercial rooftop units do
not have base pans in the condenser section.
Figure 18, p. 44.
Return Airflow
Duct
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