8
McQuay IM 672-7
Mechanical Installation
Extended Coil Section Mounting
The extended coil section is 6" wider than all other sections of
the same unit size. The extension is always located on the coil
connection side of the unit. Because the extended coil section
is wider than other sections, it always ships as a separate
shipping section, and must be joined to other sections in the
field. To join an extended coil section to other components,
first follow the
Horizontal Airflow Section Mounting‚ page 6
steps to secure the opposite connection side. To fasten the
connection side, use the following procedure:
1
If the unit has a factory-installed base rail, the extended coil
section base rail is also 6" wider than the adjoining base
rail. Extended coil section base rails on the connection side
are fastened together using the 3/8"-16 by 3" bolts located
in splice kit provided with the unit (
Figure 10
)
.
2
If no base rail is provided, the section is fastened in the
same manner on the bottom and top. Once the sections are
positioned together, remove the fastener in the corner of the
channel piece of the section mating to the extended coil
section (
Figure 10
)
.
3
Place an L-shaped section joining plate (located in the
splice kit) over the coned hole in the channel.
4
Replace the flat head fastener originally used in the corner
with a 5/16"-18 1" bolt and fasten it through the L-shaped
joining plate.
5
Position the L-shaped joining plate so it butts up against the
extended coil section frame channel. To secure the plate to
the extended coil section, run two 1/4" × 1" drill screws
through the joining plate and into the frame channel.
Figure 10: Extended Coil Section Joining
Side-by-Side Heatwheel Section Joining
The side-by-side heatwheel will have two individual sections
parallel in the direction of airflow to be attached to either side.
Each section will attach to the heatwheel section and then to
the other parallel section.
1
Rig the unit into position and line shipping sections up in
direction of air flow. Sections must be pulled together to
fasten using a furniture clamp or straps.
a
If the heatwheel section width is greater than 143”, then
rig the section into position using the 2 removable
lifting channels. After section is properly placed,
remove cotter pin and bolts from lifting channel and
discard as seen in
Figure 11
.
Figure 11: Cotter Pin and Bolt Detail
2
If included, remove center base plates that are attached to
the base channels and save for step 4.
3
If the unit has a factory installed base rail, fasten the base
rails together using the 3/8”-16 x 5” bolts located in the
splice kit provided with the unit.
a
To fasten two shipping sections together, two bolts are
required on the one side. 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.
4
Assemble the center base plates as show in
Figure 12
,
leaving a 5/16” space between each plate to slide onto
section base channels to center point of section width.
Figure 12: Base Plate Detail
5
Once the sections are positioned together, remove the
fastener in each of the channel corners (on the mating edges
in the channel piece).
6
Place a flat section joining plate (found in the splice kit)
over the two coned holes in the channels, so the plate spans
the two sections.
7
7 Replace the fasteners in their original position, through
the joining plate.
8
8 Assemble the next section parallel to the assembled
section by following steps 1 – 7 above.
9
9 Using the 3/8”-16 x 1” bolts provided, fasten the two
parallel sections’ bases together as seen in
Figure 13
.
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