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Removing the Fan Section
The fan shaft, motor, and any drive components can be
removed and replaced through the access door opening . If
required, the side panel can be removed for additional access .
If fan replacement is required, the entire fan assembly can be
pulled out the side of the cabinet for housed fan assemblies .
The fan assembly includes the fan housing, the bearing
support, and the fan base .
1 . Remove the side panels and any intermediate supports
(follow instructions for side panel removal).
2 . Once the panels and any intermediate supports are
removed, disconnect the neoprene bulk head seal that is
attached to the fan discharge .
3 . Remove the four discharge angles that hold the
neoprene canvas in place around the discharge opening .
4 . Disconnect the fan sled from each of the corner mounts
and pull the entire assembly out the side of the unit .
5 . After the fan sled is out, loosen the fan bearings and pull
out the shaft .
6 . Disconnect the fan housing from the fan sled, and
bearing support by removing the attaching bolts .
7 . Replace the new fan, reconnect the shaft and bearings
and put the fan assembly in the cabinet .
8 . Replace panels and fasteners .
For plenum fan assemblies, the entire fan cabinet may need
to be removed to replace the entire fan assembly depending
on the length of the fan section . In some cases, the fan section
is not long enough for the assembly to fit out the side of the
cabinet. For those cases where it will fit, follow the above steps
except the neoprene seal is a D-gasket on the inlet side that
needs to be removed for plenum fans. Otherwise, the entire
fan cabinet must be removed from the other sections and then
the fan assembly can be removed out the discharge side of the
cabinet .
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Removing and Replacing the Coil
The coil can be removed by the side, top, or a combination of
both. The size and configuration of the coil affects how the coil
can be removed . Single banks of coil are fastened only on the
connection side of the unit . Stacked and staggered coils are
fastened on both ends of the coil. See the instructions below
for details to remove each coil type .
Before removing the coil, disconnect all piping . The instructions
below assume the coil is mounted in a sectionalized coil
section where the frame channel can be removed without
affecting other components. If the coil section is unitized with
other components, removing the top frame channel requires
removing additional panels .
Removing Single Coils
NOTE: Single coils are bolted to the unit on the connection
end.The connection end is held in place with a clamp.
1 . Disconnect all piping and remove the brass plugs for the
vents and drains located in the connections .
2 . Remove all screws and remove the access panel.
3 . Remove the screws holding the coil in place.
4 . Lift and pull the coil out the side .
Installing Single Coils
1 . Slide the coil through the opening in the coil section onto
the bottom coil rests .
2 . To prevent any air bypass around the coil, place coils up
against the coil bulkheads (refer to
3 . Once the coil is in place, fasten the coil to the section .
4 . Caulk the seams between the coil casings and
bulkheads (refer to
5 . If this is an additional coil being installed and not
a replacement, locate the coil supply and return
connections dimensionally . Carefully drill holes in the end
panels of the unit .
6 . Remove the brass plugs for the vents and drains on the
connections .
7 . Slip the panel over the connections .
8 . Replace the brass plugs and panel fasteners .
45
IM 672-11 • VISION AIR HANDLING UNIT
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aInTenanCe
Figure
59) .
Figure
59) .
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