Trane Precedent YSJ072 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 units contain a support base alignment rail
and will extend past the end of the roof curb.
Before installing the roof curb, verify:
• It is the correct curb for the unit.
• Necessary gaskets and hardware are available.
• Confirm required clearance for installation and
2 3/4" operation.
71 MM
6 1/2"
165 MM
• The curb should be level and square. The top surface
of the curb must be level in order to confirm 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
construction of roof and ductwork. Combustible materials
2 3/4"
71 MM
should not be used in the construction of ductwork or roof
6 3/8"
curb that is in close proximity to heater elements or any hot
163 MM
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 confirm proper fit-up when the unit
is set into place.
Note: To verify 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 instructions. Curb ductwork must be fabricated
and installed by the installing contractor before the unit is
set into place.
Important: For sound consideration, cut only the holes in
48"
1223MM
WARNING
the roof deck for the ductwork penetrations.
Do not cut out the entire roof deck within the
curb perimeter.
RT-SVX071D-EN