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Installation
Horizontal Units
If the unit is installed at ground level, elevate it above the
snow line. Provide concrete footings at each support
location with a full perimeter support structure or a slab
foundation for support. Refer to the weights information in
the Dimensions and Weights chapter for unit operating and
point loading weights when constructing a footing
foundation.
If anchoring is required, anchor the unit to the slab using
hold down bolts or isolators. Isolators should be installed to
minimize the transmission of vibrations into the building.
WARNING
Risk of Roof Collapsing!
Failure to ensure proper structural roof support could
cause the roof to collapse, which could result in death
or serious injury and property damage.
Confirm with a structural engineer that the roof
structure is strong enough to support the combined
weight of the roofcurb, the unit, and any accessories.
For rooftop applications, confirm the roof is strong enough
to support the combined unit and support structural weight.
Refer to maximum unit and corner weights (center of
gravity) dimensions in the Dimensions and Weights section
for the unit operating weights. If anchoring is required,
anchor the unit to the roof with hold-down bolts or isolators.
Check with a roofing contractor for proper waterproofing
procedures.
Ductwork
Supply and return air openings as viewed from the rear of
the unit are shown in the following drawings.
Figure 13. 12.5 to 25 tons ultra high efficiency –
horizontal airflow supply/return
23 11/16''
[603]
22 3/8''
[570]
4 9/16''
[114]
7 15/16''
[202]
14 1/16''
[357]
Supply and return air openings as viewed from a downflow
configuration are shown in the following drawings.
RT-SVX077B-EN
RETURN
46 1/2''
20 ''
[1181]
[508]
26 3/4''
[679]
29''
[737]
25 1/2''
[648]
5 1/2''
[141]
Elbows with turning vanes or splitters are recommended to
minimize air noise due to turbulence and to reduce static
pressure.
When attaching the ductwork to the unit, provide a water
tight flexible connector at the unit to prevent operating
sounds from transmitting through the ductwork.
All outdoor ductwork between the unit and the structure
should be weather proofed after installation is completed.
Figure 14. 12.5 to 25 tons ultra high efficiency –
downflow airflow supply/return, through-the-base
utilities
7"
177 MM
365 MM
6 5/8''
167 MM
14 7/16"
365MM
73 5/8"
1868MM
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 roof curb, verify:
•
It is the correct curb for the unit.
•
Necessary gaskets and hardware are available.
•
Confirm required clearance for installation and
5 1/4''
[133]
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.
6''
[153]
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.
14 3/8"
40"
19 3/8"
1002MM
488MM
65"
1652MM
8 3/8"
212MM
8''
55 3/8''
205MM
1404MM
55.0577
[1398.467]
THROUGH
55.2977
THE BASE
ELECTRICAL
[1404.563]
WARNING
48"
1223MM
THROUGH
THE BASE GAS
(Y_J MODELS
ONLY)
21
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