Installation
18
RT-SVX38B-EN
For rooftop applications, ensure the roof is strong enough
to support the combined unit and support structural
weight. Refer to
Table 1, p. 17
for the unit operating
weights. If anchoring is required, anchor the unit to the
roof with hold-down bolts or isolators.
Check with a roofing contractor for proper waterproofing
procedures.
Ductwork
Figure 13, p. 18
to
Figure 16, p. 18
illustrate the supply and
return air openings as viewed from the rear of the unit.
Figure 15, p. 18
to
Figure 16, p. 18
illustrate the supply and
return air openings in a downflow configuration.
Elbows with turning vanes or splitters are recommended
to minimize air noise due to turbulence and to reduce static
pressure.
When attaching the ductwork to the unit, provide a water
tight flexible connector at the unit to prevent operating
sounds from transmitting through the ductwork.
All outdoor ductwork between the unit and the structure
should be weather proofed after installation is completed.
Roof Curb
Downflow
The roof curbs for these units consists of a “full perimeter”
enclosure to support the unit just inside of the unit base
rail.
Before installing any roof curb, verify;
•
It is the correct curb for the unit,
•
It includes the necessary gaskets and hardware,
•
The 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.
Figure 13.
5 ton unit - Horizontal supply & return air
openings
Figure 14.
6-10 ton high units - horizontal supply &
return air openings
Supply
Return
Figure 15.
5 ton unit - Downflow supply & return air
openings w/ through the base utilities
Figure 16.
6-10 ton units - downflow supply & return air
openings w/ through the base utilities
THROUGH
THE BASE GAS
THROUGH
THE BASE
ELECTRICAL
SUPPLY
RETURN
TBU CONDENSATE
3 5/8”
92 MM
14”
356 MM
9 1/4”
235 MM
15 1/2”
394 MM
4”
102 MM
24”
610 MM
16”
406 MM
27 9/16”
701 MM
4 3/16”
106 MM
4 9/16”
116 MM
23 1/2”
597 MM
2 13/16”
71 MM
6 1/2”
165 MM
3 11/16”
94 MM
4 7/8”
124 MM
5 1/16”
128 MM
9 15/16”
253 MM
