6
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A-B B-C A-C
0.5” (13) 1.0” (25) 1.0” (25)
C06110
Fig. 4 -- Unit Leveling Tolerances
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition)
shall not exceed 0.35 in. wg (87 Pa) with economizer or
0.45 in. wg (112 Pa) without economizer.
For vertica l ducted appli cations, secure all ducts to roof
curb and building structure. Do not connect ductwork to
unit.
Insulate and weatherproof all e xternal ductwork, joints,
and roof openings with counter fl ashing and mastic in
accordance with applicable codes.
Ducts passing through unc onditioned spaces must be
insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with
applicable fire codes.
A minimum clearance is not required around ductwork.
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are not
required if top crating is left on unit. Rollers may be used
to move unit across a roof. Le vel by using unit frame as a
refere nce. See Table 1 and Fig. 5 for additional
information.
Lifting holes are provided in base rails as shown in Fig. 5.
Refer to rigging instructions on unit.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
CAUTION
!
Before setting the unit onto the curb, recheck gasketing on
curb.
C06005
Fig. 5 -- Rigging Details
UNIT
MAX WEIGHT
DIMENSIONS
A B C
LB KG IN MM IN MM IN MM
48TC---A04 520 236 74.38 1888 39 991 33.38 848
48TC---A05 575 261 74.38 1888 39 991 33.38 848
48TC---A06 605 274 74.38 1888 39 991 33.38 848
48TC---A07 690 313 74.38 1888 39 991 41.38 1051
NOTES:
1. Dimensions in ( ) are in millimeters.
2. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around the
unit center of gravity. Use wooden top to prevent rigging straps from damaging unit.
3. Unit weights do not include economizer.
48TC
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