RT-SVX21AC-EN 27
Installation
Foundation
Important: Refer to local building codes for proper
installation. All installation must comply
with local building codes.
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 the unit’s
operating and point loading weights when constructing a
footing foundation.
If anchoring is required, anchor the unit to the slab using
h
old 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. 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
proce
dures.
Ductwork
Supply and return air openings as viewed from the rear of
the unit are shown in the following drawings.
WARNING
Heavy Objects!
Failure to follow instructions below or properly lift unit
could result in unit dropping and possibly crushing
operator/technician which could result in death or
serious injury, and equipment or property-only damage.
Ensure that all the lifting equipment used is properly
rated for the weight of the unit being lifted. Each of the
cables (chains or slings), hooks, and shackles used to
lift the unit must be capable of supporting the entire
weight of the unit. Lifting cables (chains or slings) may
not be of the same length. Adjust as necessary for even
unit lift.
NOTICE
Roof Damage!
System contains oil and refrigerant under high
pressure. Roofs should be protected from exposure to
oils and refrigerant in the system. If rooftop is not
protected, damage to the roof may occur.
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 32. Cooling and gas/electric — 3 to 5 tons
standard efficiency, 3 tons high efficiency—
horizontal airflow supply/return
(a)
(a) All dimensions are in inches/millimeters.
Figure 33. Cooling and gas/electric — 6-10 ton standard
efficiency units, 4 to 6 ton high efficiency
units, 6(074)-8.5 (Microchannel) high efficiency
unit—horizontal airflow supply/return
(a)
(a) All dimensions are in inches/millimeters.
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
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