Trane YSJ072A Installation, Operation And Maintenance Manual page 30

Installation
Figure 32. 6 to 10 tons standard efficiency –
downflow airflow supply/return, through-the-base
utilities
3 5/8"
92 MM
17 1/2"
9 7/8" 17 1/2"
444 MM
251 MM 444 MM
4"
102 MM
SUPPLY
RETURN
32 1/8"
816 MM
838 MM
THROUGH THE
BASE CONDENSATE
4 1/8"
104 MM
27 5/8"
701 MM
Figure 33. 12.5 tons standard efficiency – downflow
airflow supply/return, through-the-base utilities
3 5/8"
92 MM
9 7/8"
251 MM
17 1/2"
17 1/2"
444 MM 444 MM
4"
102 MM
SUPPLY
RETURN
33"
32 1/8"
838 MM
816 MM
THROUGH THE
BASE ELECTRICAL
THROUGH THE
BASE CONDENSATE
4 5/8"
4 1/8"
119 MM
104 MM
THROUGH THE
BASE GAS
27 5/8"
701 MM
Figure 34. 15 to 25 tons standard efficiency –
downflow airflow supply/return, through-the-base
utilities
7" 14 3/8" 40"
177 MM 365 MM 1002MM
6 5/8''
167 MM
14 7/16"
365MM
73 5/8"
1868MM
55 3/8''
1404MM
55.0577
[1398.467]
55.2977
[1404.563]
30
33"
40 3/4"
1035 MM
3 3/4"
95 MM
5"
127 MM
THROUGH THE
BASE ELECTRICAL
5 7/8"
149 MM
10 7/8"
276 MM
5 7/8"
42 3/16"
149 MM
1072 MM
51 3/16"
1316 MM
19 3/8"
488MM
65"
1652MM
8 3/8"
212MM
8''
205MM
THROUGH
THROUGH
THE BASE GAS
THE BASE
(Y_J MODELS
ELECTRICAL
ONLY)
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 12.5 ton standard 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.
• The includes the necessary gaskets and hardware.
2 3/4" • The purposed installation location provides the required
71 MM
6 1/2"
165 MM
clearance for proper operation.
• Insure that the curb is level and square. The top
surface of the curb must be true to assure an adequate
curb-to unit seal.
Combustible Materials!
Failure to maintain proper clearance between the unit
and combustible materials could cause a fire which
could result in death, serious injury, or property
damage.
Refer to unit nameplate and installation instructions
for proper clearances.
Verify that appropriate materials were used in the
2 3/4"
71 MM
construction of roof and ductwork. Combustible materials
6 3/8"
should not be used in the construction of ductwork or roof
163 MM
curb that is in close proximity to heater elements or any hot
surface. Any combustible material on the inside of the unit
base should be removed and replaced with appropriate
material.
Step-by-step curb assembly and installation instructions
ship with each accessory roof curb kit. Follow the
instructions carefully to assure proper fit-up when the unit is
set into place.
Note: To assure proper condensate flow during operation,
the unit (and curb) must be 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.
Note: For sound consideration, cut only the holes in the
roof deck for the ductwork penetrations. Do not cut
48"
1223MM
out the entire roof deck within the curb perimeter.
WARNING
RT-SVX071A-EN