20
RT-SVX23M-EN
Installation
Foundation
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. For the unit’s operating and point
loading weights when constructing a footing foundation,
refer to the maximum unit/corner weights table in the
weights section of this manual.
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.
For rooftop applications, ensure the roof is strong enough
to support the combined unit and support structural
weight. 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.
Supply and return air openings as viewed from a
downflow configuration to 5 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.
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.
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 and the unit. Refer to the weights section for
typical unit and curb weights.
Figure 26. Heat pump - 3 to 4 tons standard efficiency, 3
ton high efficiency - horizontal airflow supply/
return
SUPPLY
RETURN
3/4-14 NPT
DRAIN CONNECTION
CONDENSER COIL
17 1/4”
438 MM
8 7/8”
225 MM
13 1/4”
337 MM
23 1/4”
591 MM
3 3/16”
81 MM
14 3/4”
375 MM
4 3/4”
121 MM
Figure 27. Heat pumps - 5 to 10 tons standard efficiency,
4 to 5 ton high efficiency - horizontal airflow
supply and return
Figure 28. Heat pump - 3 to 4 tons standard efficiency, 3
ton high efficiency - downflow airflow supply/
return - through-the-base utilities
Supply
Return
THROUGH
THE BASE GAS
(Y_C/DHC 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
Summary of Contents for Precedent WSC072E
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