Installation
22 RT-SVX21N-EN
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. Refer to Table 1, p. 21 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.
For rooftop applications, ensure the roof is strong enough
to support the combined unit and support structural
weight. Refer to Table 1, p. 21 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
Figure 16, p. 22 to Figure 18, p. 23 illustrate the supply and
return air openings as viewed from the rear of the unit.
Table 2. Factory installed options (fiops)/accessory net weights (lbs)
(a),(b)
YSC036E-060E
YHC036E,YHC037E
YHC047E-067E
YHC048F-060F
YSC072F-102F
YHC072E/F
YHC092F-102F,
YSC120F YHC120E
Net Weight Net Weight Net Weight Net Weight Net Weight
Accessory 3-5 T 4-5 T 6-8½ T 7½, 8½, 10 T 10 T
Barometric Relief 7 10 10 10 10
Belt Drive Option (3 phase only) 31 31 — — —
Coil Guards 12 20 20 20 30
Economizer 26 36 36 36 36
Hinged Doors 10 12 12 12 12
Manual Outside Air Damper 16 26 26 26 26
Motorized Outside Air Damper 20 30 30 30 30
Novar Control 8 8888
Oversized Motor 5 8 8 — —
Powered Convenience Outlet 38 38 38 38 50
Powered Exhaust 40 40 80 80 80
Reheat Coil 12 14 15 — 30
Roof Curb 61 78 78 78 89
Smoke Detector, Supply 5 5555
Smoke Detector, Return 7 7777
Stainless Steel Heat Exchanger 4 6666
Through-the-Base Electrical(c) 8 13131313
Through-the-Base Gas 5 5555
Unit Mounted Circuit Breaker 5 5555
Unit Mounted Disconnect 5 5555
460V/575V IDM Transformer
(c)
29 29 — — —
(a)Weights for options not listed are <5 lbs.
(b)Net weight should be added to unit weight when ordering factory-installed accessories.
(c) Apply weight with all 460V and 575V 17 Plus Two-Stage Cooling units.
Figure 16. 3-5 ton standard efficiency units & 3 ton high
efficiency units - Horizontal supply & return
air openings
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