McQuay IM 672-3
5
Installation Guidelines
Internal Section-to-Section Mounting
If desired, shipping sections can be fastened together internally.
To fasten internally, run field-provided #10 sheet metal screws or
drill screws (4" long maximum) through the interior frame
channel of one unit into the splice joint of the neighboring section.
The section-to-section splice joint is always provided on the
leaving air side of a shipping section and seals against the
frame channel on the entering-air side of the adjoining section.
Align the splice joint to seat into the mating gasket to provide
an air seal. If the splice joint was bent during shipping or
rigging, restore it to its original position. See Figure 10.
Figure 10: Internal fastening
Ceiling Hung
When a unit is ceiling hung, support it with a base rail, angle iron,
or channel. The Vision air handler is not designed to be suspended
from the top of the unit. Before hanging, rig and completely
assemble the unit. See “Assembling Sections” on page 3.
Ceiling Hung Using Base Rail
The optional base rail provided by the factory has 5/8" diameter
holes in each corner to run hanger rods through. To properly
support the unit and maintain unit integrity, support each
shipping section with hanger rods in each corner. See Figure 11.
Figure 11: Ceiling suspended with base rail
Ceiling Hung Using Angle Iron Channel
Install field-provided angle iron or channels per SMACNA
guidelines. When a unit is unitized (ships in one piece), channel
support each component under the unit width.
See Figure 12.
When a unit is sectionalized (ships in multiple sections), channel
support each component under the unit width and provide support
under the full length of the unit base.
See Figure 13. Locate
hanger rods so they do not interfere with access into the unit.
Ceiling suspension using the unit base rails is limited to
unit cabinet widths less than 108".
Support units with
cabinets 108" wide and greater with structural members
designed to support the unit at the ends and at intermediate
points along the base rails.
Figure 12: Ceiling suspended w/o base rail (unitized)
construction
Figure 13: Ceiling suspended w/o base rail—modular
construction
A
S p l i c e C o l l a r
m u s t b e a l i g n e d
t o s e a l t o g a s k e t .
