Unit Leveling
Place the equipment on a flat and level surface. Where the
surface irregularities could cause the equipment to distort,
use a shim so the base of the unit is a straight line . Uneven
or distorted sections cause misfit or binding of the doors and
panels and improper draining of drain pans . Units that are over
108" wide must rest on a flat surface for the entire width of the
base rails or must be shimmed at one or more points along the
length of the rails to prevent distortion or sagging of the support
rails (
Figure 9
) .
Figure 9: Leveling the Unit
Assembling Sections
External Section-to-Section Mounting
Vision air handling units can ship fully assembled or as
separate shipping sections. Rig units that require field
assembly of shipping sections into position first. Shipping
sections are provided with a connection splice joint attached on
the leaving air side of the shipping section . The splice joint is
insulated and provides an air-tight seal between two sections
once they are assembled together. If the splice joint was bent
during shipping or rigging, restore it to its original position .
(
Figure 19 on page 12
) .
Horizontal Airflow Section Mounting
1 . Rig the unit into position and lineup shipping sections in
the direction of air flow. Pull sections together to fasten.
Use a furniture clamp or straps and a ratchet to help pull
the sections together securely (
Figure 10
) .
2 .
If the unit has a factory-installed base rail, first fasten
base rails together using the 3/8"-16 × 5" bolts located in
the splice kit provided with the unit.
a .
To fasten two shipping sections together, four bolts
are needed (two on each side of the unit). The
bolts are run from one base rail into the other and
fastened with a nut. Complete each section bottom
and top before attaching additional sections .
3 . If no base rail is provided, fasten the unit in the same
manner on the bottom and top frame channels .
4 . Once the sections are positioned together, remove the
fastener in each of the channel corners (on the mating
edges in the channel piece) .
5 .
Place a flat section joining plate (found in the splice kit)
over the two coned holes in the channels, so that the
plate spans the two sections.
6 . Replace the fasteners in their original position, through
the joining plate .
7 . For certain Custom Air Handler units, use the provided
section joining plates to fasten sections together . Space
them as shown in
Figure 11
. Using the provided ¼"-14 x
1" self tapping screws, drill screw the joining plates into
the frame channel on each section, keeping unit sections
tight together. Follow instruction drawing included in the
assembly kit .
IM 672-11 • VISION AIR HANDLING UNIT
8
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