6
McQuay IM 672-7
Mechanical Installation
Figure 4: Units on Skids
Fan sections greater than 108" wide that are stacked on another
section are constructed with internal fan support frames that
have integral lifting brackets (
Figure 5
). After the fan section
is placed in position, remove and discard the lifting brackets.
Install the small panels provided to complete the unit cabinet
areas where the lifting brackets were located.
Figure 5: Large Fan Sections Stacked on Top of a Lower
Section
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 6
).
Figure 6: 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 16, page 9
)
.
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 7
).
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.
R e m o v e
l i f t i n g
b r a c k e t s ( 4 )
I n s t a l l p a n e l s ( 4 )
S h i m t o p r e v e n t
d i s t o r t i o n i f w i d t h
i s o v e r 1 0 8 "
S h i m s e c t i o n s u n t i l
t h e y a r e s t r a i g h t
a n d l e v e l
