Unico 3642 User Manual

Bulletin 30-20 — Page 8
© Copyright 2010, Unico, Inc.
Like the modules, all the secondary drain pans except
UPC-24C, D will fit through the return air opening. For
these drain pans it will be necessary to fold the pans in
order to pass through the return opening. If you are una-
ble to use the UPC-24D because of space limitations,
use the UPC-24B under the cooling and heating mod-
ules. In this case the blower module will extend beyond
the secondary drain pan and should be supported with
blocks or an angle iron frame.
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 vertic-
al heat module (with or without the heating coil) and the
vertical spacer module.
Horizontal Platform Mounting
Mount the unit horizontally when vertical height is li-
mited 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.
IL00036a.CNV
A
*
Rafter, Joist
or Floor
B
2 Modules 3 Modules
Unit
2430 3642 4860 2430 3642 4860
A
27 (690) 40 (1000) 27 (690) 40 (1000)
B 30 (760) 42 (1070) 42 (1070) 50 (1270)
* See Table 3
Figure 8. 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. Ta-
ble 3 lists the maximum horizontal drain line run for
various framing materials and still provide adequate
drainage.
Table 3. Horizontal Distance of Drain Piping for Different
Framing Materials
Frame Lumber:
2 × 4 2 × 6 2 × 8 2 × 10
Max. Horizontal Run, ft. (m)
18 (5) 26 (8) 34 (10) 42 (13)
The platform size must allow for the number of modules
being used. For dimensions for minimum platform size
see Fig. 8.
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
CAUTION
Do not hang unit from top of unit cabi-
net as this could distort unit.
The modules can also be suspended from the ceiling or
rafters. A typical suspension method is shown in Fig. 9.
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.
As an alternative, rest the unit on the angle iron supports
and hang the secondary drain pan from the same sup-
ports. As 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
slight pitch towards the drain end.
IL00038b.CVN
HOOK
RAFTER
CHAIN
ANGLE IRON
UNIT
SECONDARY
DRAIN PAN
Figure 9. Typical Suspended Mounting
Vertical Airflow Installation
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 2430 and 3642 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.

Unico 3642 Specifications

General

Brand	Unico
Model	3642
Category	Air Handlers
Language	English