3
It is mandatory to use spreader bars for larger units with lift-
ing lugs or slings for smaller units to prevent damage to the
casing of the units by rigging equipment. Only qualified rig-
ging personnel should operate lift equipment.
Units can be lifted with forklifts as long as the forks are
40 inches and the end tips contact the bottom of the intermedi-
ate supports of the base rail. Additionally, a fork lift may be
used to lift small subassemblies or individual sections, but the
forks must reach the other side of the base rail. See Fig. 3.
To avoid damaging the air-handling unit, always lift in an
upright position, and never move or lift unit from a sideways or
upside-down position.
Use extreme caution when moving an
air-handling unit with a forklift
.
SPLIT UNITS — Split units less than 102 in. may be shipped
loosely assembled. Disassembly is required, with each section
being lifted individually. The “loosely assembled” split sec-
tions are affixed using a minimum number of bolts for transit
and cannot be lifted while fastened together. Use all lifting lugs
to avoid unit damage and/or personal injury.
Clearance Requirements —
As required by the state,
city or the national electrical code (NEC or CEC), the service
space between the face of any electrical enclosure and wall or
obstruction must be 42 inches minimum.
Sufficient clearances are also needed to open doors and in-
stall piping and ductwork. Airflow through the louvers of
hoods cannot be obstructed in any way. The distance between
the louver and any facing wall must be equal to the horizontal
width of the louver.
Space around the unit must allow easy removal of the ac-
cess panels and parts such as the fan wheels, motors and belt
guards. To facilitate removal of coils, fan shaft, and fan wheel,
allow a minimum clearance equal to the width of the unit on
one side.
INSTALLATION
• The services of qualified field services personnel are
required for safe and proper installation of this equip-
ment.
• Do not operate this unit outside the listed nameplate rat-
ings for flow or static pressure.
• This unit is designed for installation on a level surface or
suspended on a level plane.
• Follow SMACNA (Sheet Metal and Air Conditioning
Contractors’ National Association) guidelines for sup-
ply/return/exhaust duct connections and minimal duct
obstruction clearances.
Air Handler Unit Pad —
The foundation and floor
should be level (shim when necessary), rigid, and strong
enough to support the weight of the entire unit. It is the
installer’s responsibility to secure the unit to the unit pad in ac-
cordance with all applicable building and earthquake codes.
After the unit has been installed, the base rail should be in-
spected for paint damage from chains in the tie down brackets,
use of the lifting lugs and fastening the unit down. This damage
must be repaired by cleaning down to bare metal and applying
two heavy coats of matching paint to stop corrosion and rust.
Ceiling Suspended Units —
Ceiling suspended units
must be supported from the base. To fully support the unit, four
or more suspension points are required. The casing is not a sup-
port component. The exact number of support points is func-
tion of the unit length and weight. Please refer to submittal
drawings for lift locations. The installer is responsible for in-
stalling in accordance with applicable building and earthquake
Roof Curb —
Roof curbs are shipped either fully welded
or in split sections. Bolt together if roof curb is bolted construc-
tion. Follow this procedure to assemble roof curb, if required:
1. Arrange the 4 perimeter sidewalls so that pre-drilled holes
are aligned. Drive bolt each corner securely (bolts provid-
ed).
2. Drive bolt the remaining support members using the pre-
drilled holes and provided drive bolts. Turn out the flang-
es before fastening. See Fig. 5.
3. Line up the assembled curb with the roof openings.
Square up the curb by measuring the diagonal distance
between opposite corners and adjust until the distances
are equal. Level the curb.
4. Install the foam rubber seal strip atop the installed curb.
This provides an airtight seal and isolates the roof from
vibration.
FORKS
a39-4461
Fig. 3 — Forklift
a39-4460
Fig. 4 — Suspension Mounting
SIDEWALL
PRE-DRILLED HOLES
(BOLTS SHIPPED LOOSE)
a39-4464
Fig. 5 — Roof Curb Assembly
