Roof Curb; Downflow - Trane YSC036G Installation, Operation And Maintenance Manual

Installation
Figure 34. Cooling and gas/electric —10 tons high
efficiency— horizontal airflow, supply and
(a)
return
4 1/4"
108 MM
(a) All dimensions are in inches/millimeters.
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 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.
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
3 5/8"
14" 9 1/4"
15 1/2"
92 MM
235 MM
356 MM 394 MM
4"
102 MM
18"
457 MM
RETURN
24"
610 MM
TBU CONDENSATE
4 3/16"
106 MM
23 1/2"
597 MM THROUGH
THE BASE GAS
28
3 7/8"
98 MM
9 3/8"
238 MM
RETURN 32 1/4"
832 MM
16 3/4"
425 MM
SUPPLY
19 1/4"
489 MM
32 1/4"
4 3/4"
832 MM
120 MM
27 5/8"
701 MM
3/4 - 14 NPT DIA. HOLE
CONDENSATE DRAIN
SUPPLY
27 9/16"
701 MM
2 13/16"
71 MM
4 9/16"
3 11/16"
116 MM
94 MM
4 7/8"
124 MM
THROUGH
5 1/16"
THE BASE
128 MM
ELECTRICAL
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
3 5/8"
92 MM
9 7/8"
251 MM
17 1/2"
444 MM
4"
102 MM
Return
32 1/8"
816 MM
4 1/8"
104 MM
27 5/8"
701 MM

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
6 1/2"
165 MM
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 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.
17 1/2"
444 MM
Supply
33"
838 MM
THROUGH THE
BASE ELECTRICAL
THROUGH THE
BASE CONDENSATE
4 5/8"
119 MM
5 7/8"
42 3/16"
149 MM
1072 MM
51 13/16"
1316 MM
RT-SVX21AC-EN
2 3/4"
71 MM
6 3/8"
163 MM