Installation
RT-SVX46G-EN 25
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.
Before installing any roof curb, verify:
• It is the correct curb for the
unit.
• It includes the necessary gasket
s and hardware.
• The purposed installation location provides the
required
clearance for proper operation.
• The curb is level and square and the top surface of the
curb must be true to
assure an adequate curb-to-unit
seal.
Verify that appropriate materials were used in the
constructi
on 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 w
ith each accessory roof curb kit. Follow the
instructions carefully to assure proper fit-up when the unit
is set into place.
Figure 41. 3 tons ultra high efficiency - downflow airflow
supply/return - through-the-base utilities
(a)
(a) All dimensions are in inches/millimeters.
Figure 42. 4 to 5 tons ultra high efficiency- downflow
airflow supply/return - through-the-base
utilities
(a)
(a) All dimensions are in inches/millimeters.
Figure 43. Cooling and gas/electric - 6 to 8.5 tons ultra
high efficiency - downflow supply/return
through-the-base utilities
Note: All dimensions are in inches/millimeters.
THROUGH
THE BASE GAS
(Y_C Models only)
THROUGH
THE BASE
ELECTRICAL
SUPPLY
RETURN
TBU CONDENSATE
3 5/8”
92 MM
14”
356 MM
9 1/4”
235 MM
15 1/2”
394 MM
4”
102 MM
24”
610 MM
18”
457 MM
27 9/16”
701 MM
4 3/16”
106 MM
4 9/16”
116 MM
23 1/2”
597 MM
2 13/16”
71 MM
6 1/2”
165 MM
3 11/16”
94 MM
4 7/8”
124 MM
5 1/16”
128 MM
9 15/16”
253 MM
4”
102 MM
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
RETURN
SUPPLY
THROUGH THE
BASE CONDENSATE
4 1/8”
104 MM
27 5/8”
701 MM
40 3/4”
1035 MM
4 5/8”
119 MM
THROUGH THE
BASE ELECTRICAL
5 7/8”
149 MM
10 7/8”
276 MM
5”
127 MM
3 3/4”
95 MM
2 3/4”
71 MM
6 1/2”
165 MM
THROUGH THE
BASE GAS
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 44. Cooling and gas/electric - 10 tons ultra high
efficiency - downflow airflow supply/return,
through-the-base utilities
Note: All dimensions are in inches/millimeters.
WARNING
Combustible Materials!
Failure to maintain proper clearance between the unit
heat exchanger, vent surfaces and combustible
materials could cause a fire which could result in death
or serious injury or property damage. Refer to unit
nameplate and installation instructions for proper
clearances.
RETURNRETURN
SUPPLYSUPPLY
3 5/8”3 5/8”
92 MM92 MM
17 1/2”17 1/2”
444 MM444 MM
9 7/8”9 7/8”
251 MM251 MM
17 1/2”17 1/2”
444 MM444 MM
32 1/8”32 1/8”
816 MM816 MM
33”33”
838 MM838 MM
4”4”
102 MM102 MM
THROUGH THE THROUGH THE
BASE ELECTRICALBASE ELECTRICAL
THROUGH THE THROUGH THE
BASE CONDENSATEBASE CONDENSATE
4 5/8”4 5/8”
119 MM119 MM
THROUGH THETHROUGH THE
BASE GASBASE GAS
5 7/8”5 7/8”
149 MM149 MM
27 5/8”27 5/8”
701 MM701 MM
42 3/16”42 3/16”
1072 MM1072 MM
6 3/8”6 3/8”
163 MM163 MM
2 3/4”2 3/4”
71 MM71 MM
51 3/16”51 3/16”
1316 MM1316 MM
4 1/8”4 1/8”
104 MM104 MM
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