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Installation
WARNING
Heavy Object!
Failure to follow instructions below could result in
unit dropping 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.
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
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, 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
procedures.
28
Ductwork
Supply and return air openings as viewed from the rear of
the unit are shown in the following drawings.
Figure 28. 6 to 10 tons high efficiency – horizontal
airflow supply/return
4-1/4"
[109]
Figure 29.
12.5 tons high efficiency – horizontal
airflow, supply and return
4 1/4"
108 MM
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
9 3/8"
238 MM
RETURN
16 3/4"
425 MM
SUPPLY
19 1/4"
489 MM
32 1/4"
832 MM
27 5/8"
701 MM
3/4 - 14 NPT DIA. HOLE
CONDENSATE DRAIN
RT-SVX074A-EN
3-7/4"
[97]
32-1/4"
[820]
3 7/8"
98 MM
32 1/4"
832 MM
4 3/4"
120 MM
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