Unit Dimensions And Weights; Recommended Clearances; Roof Curb And Ductwork; Horizontal Ductwork - Trane Voyager Commercial Installation & Operation Manual

Unit Dimensions and Weights

Recommended Clearances

Adequate clearance around and above each Voyager Commercial unit is required to ensure proper
operation and to allow sufficient access for servicing.
If the unit installation is higher than the typical curb elevation, a field constructed catwalk around
the unit is recommended to provide safe, easy access for maintenance and servicing.
lists the recommended clearances for single and multiple unit installation. These clearances are
necessary to assure adequate serviceability, cataloged capacities, and peak operating efficiency.
If the clearances available on the job site appear to be inadequate, review them with your Trane
sales representative.

Roof Curb and Ductwork

The curbs for the 27.5 to 50 Ton commercial rooftop units enclose the entire unit base area. They
are referred to as "full perimeter" type curbs.
Step-by-step instructions for the curb assembly and installation with curb dimensions and curb
configuration for "A", "B", and "C" cabinets ship with each Trane accessory roof curb kit. (See the
latest edition of the curb installation guide) Follow the instructions carefully to assure proper fit
when the unit is set into place.
The S/A and R/A ductwork adjoining the roof curb must be fabricated and installed by the installing
contractor before the unit is set into place. Trane curbs include flanges around the openings to
accommodate duct attachment.
Ductwork installation recommendations are included in the instruction booklet that ships with each
Trane accessory roof curb kit.
Note: For sound consideration, cut only the holes in the roof deck for the supply and return duct
If a Trane curb accessory kit is not used:

Horizontal Ductwork

When attaching the ductwork to a horizontal unit, provide a water tight flexible connector at the unit
to prevent noise transmission from the unit into the ductwork. Refer to figures beginning on page
17
All outdoor ductwork between the unit and the structure should be weather proofed after
installation is completed.
If optional power exhaust is selected, an access door must be field-installed on the horizontal return
ductwork to provide access to exhaust fan motors.
16
penetration. Do Not remove the roof decking from the inside perimeter of the curb.
a. The ductwork can be attached directly to the S/A and R/A openings. Be sure to use a flexible
duct connector at the unit.
b. For "built-up" curbs supplied by others, gaskets must be installed around the curb perimeter
flange, S/A opening, and R/A openings.
c. Insulation must be installed on the bottom of the condenser section of the unit.
for the S/A and R/A opening dimensions.
Table 1, p. 23
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