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A
Fig. 7 — 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 vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Insulate and weatherproof all external ductwork, joints, and
roof openings with counter flashing and mastic in accordance
with applicable codes.
Ducts passing through unconditioned 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.
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage to roof-
ing materials.
Membrane roofs can be cut by sharp sheet metal edges. Be
careful when placing any sheet metal parts on such roof.
"B"
UNIT
549J*12
NOTES:
1. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not used.
2. Dimensions in ( ) are in millimeters.
3. 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.
C
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
B
A-B
B-C
0.5 (13)
1.0 (25)
1.0 (25)
PLACE ALL GASKET IN PLACE BEFORE PLACING
UNIT ON ROOF CURB.
(914 - 1371)
36" - 54"
"C"
"A"
SEE DETAIL "A"
MAX WEIGHT
lb
kg
2075
943
Fig. 8 — Rigging Details
UNITS WITH ACCESSORY ELECTRIC HEATERS
All installations require a minimum clearance to combustible
surfaces of 1-in. (25 mm) from duct for first 12-in. (305 mm)
away from unit.
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are required.
Rollers may be used to move unit across a roof. When the unit
is ready to be rigged and no longer will be lifted by a fork
truck, the wood protector under the basepan must be removed.
Remove 4 screws from each base rail. Wood protector will
drop to the ground. See instructions on the unit base rails. Lev-
el by using unit frame as a reference. See Table 5 and Fig. 8 for
additional information.
Lifting holes are provided in base rails as shown in Fig. 8. Re-
fer to rigging instructions on unit.
A-C
Before setting the unit onto the curb, recheck gasketing on curb.
Rigging materials under new unit (cardboard or wood) must be
removed PRIOR to placing the unit on the roof curb.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment dam-
age.
All panels must be in place when rigging. Unit is not de-
signed for handling by fork truck when packaging
is removed.
If using top crate as spreader bar, once unit is set, carefully
lower wooden crate off building roof top to ground. Ensure
that no people or obstructions are below prior to lowering
the crate.
DUCT END
A
in.
mm
in.
116.0
2945
58.5
10
CAUTION
DETAIL "A"
DIMENSIONS
B
mm
in.
1485
59.5
C
mm
1510
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