Bulletin 30-020.007
Copyright © 2019 Unico Inc. Page 13
MOUNTING
The modules come factory-ready for horizontal
airflow applications and may be modified for vertical
airflow arrangements (see Fig. 1) with the addition of
the vertical heat module (with or without the heating
coil) and the vertical spacer module.
Horizontal Platform Mounting. Mount the unit
horizontally when vertical height is limited such as in
an attic or crawl space. It is easiest to mount the unit
on a platform, but care must be taken to assure proper
drain line pitch.
Figure 13. Typical Platform Installation
The platform height must allow for proper pitch of the
condensate drain lines — at least ¼ inch drop per
lineal foot (20 mm per meter). The platform can be
built from a sheet of ½ inch (13 mm) plywood and stud
frame. Table 3 lists the maximum horizontal drain line
run for various framing materials and still provide
adequate drainage.
Table 4. Horizontal Distance of Drain Piping for
Different Framing Materials
The platform size must allow for the number of
modules being used. For dimensions for minimum
platform size see Figure 13.
Place secondary drain pan on platform and unit on top
of isolation pads inside of secondary drain pan. Be sure
that the unit is raised above the height of the drain pan
side to allow duct connections.
Horizontal Suspended Mounting. The modules can
also be suspended from the ceiling or rafters. A typical
suspension method is shown in Fig. 14a. Screw four
(4) “J” hooks into rafters. Suspend four (4) chains from
“J” hooks and attach eyebolts to chains. Secure angle
iron to eyebolts and place secondary drain pan on top.
Put isolation pads in drain pan, making sure unit sits
above sides of drain pan.
CAUTION
Do not hang unit from top of unit
cabinet as this could distort unit.
As an alternative, rest the unit on the angle iron
supports and hang the secondary drain pan from the
same supports. As stated above, install “J” hooks,
chains, and angle iron. Secure angle iron to eyebolts
and put isolation padding on angle iron.
Adjust the length of the eyebolts and chains so there is
a slight pitch towards the drain end.
Figure 14a. Typical Suspended Mounting
Vertical Mounting (2430, 3036, 3642, 4860).
Because the units are top heavy, it is not recommended
to suspend a vertical unit. It should be mounted on
either a platform or a floor. Unico makes a module
specifically for vertical installations (refer to previous
section). If only a blower and heating module are being
installed, fabricate a return plenum for the unit to sit
upon.
Although the modules may be assembled without a
spacer module, this can severely restrict the airflow;
especially if the blower needs to achieve its maximum
airflow. Therefore, always use the spacer module for
any vertical configuration.
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