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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 29. 6 to 10 tons high efficiency – horizontal
airflow supply/return
4-1/4"
[109]
RT-SVX075C-EN
9-3/8"
[237]
16-3/4"
[426]
19-1/4"
[490]
32-1/4"
[820]
27-5/8"
[700]
3/4 -14 NPT DIA. HOLE
CONDENSATE DRAIN
Figure 30.
airflow, supply and return
4 1/4"
108 MM
Figure 31. 15 to 25 ton 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.
Elbows with turning vanes or splitters are recommended to
minimize air noise due to turbulence and to reduce static
pressure.
3-7/4"
[97]
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.
32-1/4"
[820]
12.5 tons high efficiency – horizontal
SUPPLY
19 1/4"
489 MM
32 1/4"
832 MM
3/4 - 14 NPT DIA. HOLE
CONDENSATE DRAIN
26 3/4''
[679]
25 1/2''
[648]
5 1/2''
[141]
3 7/8"
98 MM
9 3/8"
238 MM
RETURN
32 1/4"
832 MM
16 3/4"
425 MM
4 3/4"
120 MM
27 5/8"
701 MM
5 1/4''
[133]
RETURN
46 1/2''
20 ''
[1181]
[508]
29''
[737]
6''
[153]
29
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