Bypass Into a Vertical Fan Section
Vertical coil sections and the top mounted fan section always
ship separately and must be mounted together at the job site .
The vertical coil section and the bypass duct each has a joining
collar mounted on the leaving air side of the section and duct,
respectively (
Figure 26
). The mounting collar fits into the side
(bypass) and bottom (vertical coil section) openings in the fan
section . To correctly position the collars in the fan openings,
assemble the fan and coil section first. Use the steps below for
assembly .
1 . Place the vertical coil section in position . If an access
section is positioned downstream from the coil section
and not already assembled to the coil section, secure the
two sections together.
2 . Lift the fan section on top of the vertical coil section,
taking care to line up the joining collar in the bottom of
the fan section .
3 . For sizes 003 to 035, the bypass duct is integral to the
unit construction and does not require attachment to
the bypass section . For sizes 040 to 090, position and
assemble the bypass duct to the bypass section before
joining to the fan .
4 . Once the fan is positioned on top of the vertical coil
section and the bypass duct and bypass section are
assembled, position the two assemblies and line up the
joining collars with the openings in the fan and vertical
coil section .
5 . Once the sections are lined up and in position, secure
the unit together by fastening joining plates to the unit .
External Face and Bypass Duct
Assembly (Sizes 040 to 090)
When unit sizes 040 to 090 are ordered with external face
and bypass, the bypass duct ships separately and must be
attached to the unit in the field. The joining of the bypass duct
to the unit must be done after the unit is assembled . Also, if
the bypass duct is over 90" long, the duct does not ship in one
piece and must be field assembled. The field assembly of the
bypass duct to the unit requires the following steps (also refer
to
Figure 27
) .
1 . Position the unit shipping sections together and
assemble in the equipment room .
2 . After the unit is assembled, lift the duct into position over
the unit . Joining collars are shipped factory assembled
to the unit and duct . There is a joining collar located in
the top of the bypass opening and in the leaving air side
of the bypass duct . These joining collars are used to
provide air seals. Line up the duct with the top openings
in the unit .
3 . If the bypass duct is longer than 90", the duct ships in
more than one piece and must be field assembled. Place
the piece of duct that has the joining collar on the bottom
on top of the unit first. Once it is in place, position the
other piece of duct. Take care to fit the splice collar into
the first piece of duct and then lower the other end into
the bypass opening .
4 . Once the duct is positioned correctly, fasten the duct
pieces together with the joining plate provided. To do
this, remove the fasteners in the corners of the duct
assemblies, place the plate over the holes in the corners,
and then replace the fasteners (
Figure 10 on page 9
) .
Figure 27: Assembly of Bypass Duct to Unit
M
eChanICal
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www.DaikinApplied.com
15
IM 672-11 • VISION AIR HANDLING UNIT
