30
RT-SVX071A-EN
Figure 32.
6 to 10 tons standard 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 standard 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 standard 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 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.
•
The purposed installation location provides the required
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.
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 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
out the entire roof deck within the curb perimeter.
