30
RT-SVX075C-EN
Figure 32. 6 to 10 tons high efficiency – downflow
airflow supply/return, through-the-base utilities
3 5/8”
92 MM
17 1/2”
444 MM
4”
102 MM
9 7/8”
251 MM
17 1/2”
444 MM
32 1/8”
816 MM
RETURN
SUPPLY
33”
838 MM
4 1/8”
104 MM
27 5/8”
701 MM
THROUGH THE
BASE CONDENSATE
40 3/4”
1035 MM
THROUGH THE
BASE ELECTRICAL
5 7/8”
149 MM
5”
127 MM
10 7/8”
276 MM
3 3/4”
95 MM
2 3/4”
71 MM
6 1/2”
165 MM
Figure 33. 12.5 tons high efficiency – downflow
airflow supply/return, through-the-base utilities
RETURN
SUPPLY
3 5/8”
92 MM
17 1/2”
444 MM
9 7/8”
251 MM
17 1/2”
444 MM
32 1/8”
816 MM
33”
838 MM
4”
102 MM
THROUGH THE
BASE ELECTRICAL
THROUGH THE
BASE CONDENSATE
4 5/8”
119 MM
THROUGH THE
BASE GAS
5 7/8”
149 MM
27 5/8”
701 MM
42 3/16”
1072 MM
6 3/8”
163 MM
2 3/4”
71 MM
51 3/16”
1316 MM
4 1/8”
104 MM
Figure 34. 15 to 25 tons high efficiency – downflow
airflow supply/return, through-the-base utilities
7"
177 MM
14 3/8"
365 MM
14 7/16"
365MM
40"
1002MM
19 3/8"
488MM
65"
1652MM
73 5/8"
1868MM
8 3/8"
212MM
48"
1223MM
6 5/8''
167 MM
55.0577
[1398.467]
55.2977
[1404.563]
8''
205MM
55 3/8''
1404MM
THROUGH
THE BASE
ELECTRICAL
THROUGH
THE BASE GAS
(Y_J MODELS
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
operation.
• 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.
WARNING
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
should not be used in the construction of ductwork or roof
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 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
the roof deck for the ductwork penetrations.
Do not cut out the entire roof deck within the
curb perimeter.
Installation
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