Installation
28 RT-SVX21AC-EN
Supply and return air openings as viewed from a
downflow configuration are shown in the following
drawings.
Elbows with turning vanes or splitters are recommended
to
minimize air noise due to turbulence and to reduce s
tatic
pressure.
When attaching the ductwork
to the unit, provide a water
tight flexible con
nector 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. The 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.
Before installing any roof curb, verify;
• It is the correct curb for the
unit,
• It includes the necessary gaskets and h
ardware,
• The installation location provides the required
clearance fo
r 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.
Fi
gure 34. Cooling and gas/electric —10 tons high
effic
iency— horizon
tal airflow, supply and
return
(a)
(a) All dimensions are in inches/millimeters.
Figure 35. 3 to 5 ton standard efficiency units and 3 ton
high efficiency units - downflow supply and
return air openings w/ through-the-base
utilities
4 1/4”
108 MM
32 1/4”
832 MM
19 1/4”
489 MM
SUPPLY
RETURN
16 3/4”
425 MM
9 3/8”
238 MM
32 1/4”
832 MM
4 3/4”
120 MM
27 5/8”
701 MM
3/4 - 14 NPT DIA. HOLE
CONDENSATE DRAIN
3 7/8”
98 MM
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
18”
457 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
Figure 36. 4 to 6 ton high efficiency units, 6(074)-8.5
(Microchannel) high efficiency units and 6 to 10
ton standard efficiency units - down flow
supply and return air openings w/ through-
the- base utilities
Figure 37. 10 ton high efficiency unit - downflow supply
and return air openings w/ through-the-base
utilities
Supply
Return
32 1/8”
816 MM
33”
MM
4”
102 MM
17 1/2”
444 MM
17 1/2”
444 MM
3 5/8”
92 MM
9 7/8”
251 MM
4 1/8”
104 MM
27 5/8”
701 MM
THROUGH THE
BASE CONDENSATE
4 5/8”
119 MM
THROUGH THE
BASE ELECTRICAL
51 13/16”
1316 MM
42 3/16”
1072 MM
5 7/8”
149 MM
6 3/8”
163 MM
2 3/4”
71 MM
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