Wall Mount Applications; Din Rail Mount Applications - Johnson Controls IOM3721 Installation Manual

Observe these additional guidelines when mounting
an expansion module in a panel or enclosure:
• Mount the expansion module so that the
enclosure walls do not obstruct cover removal or
ventilation through the expansion module.
• Mount the expansion module so that the power
transformer and other devices do not radiate
excessive heat to the expansion module.
• Do not install the expansion module in an airtight
enclosure.
Figure 2: Mounting positions

DIN rail mount applications

Mounting the expansion module horizontally on 35
mm (1.4 in.) DIN rail is the preferred method.
To mount an expansion module on a 35 mm DIN
rail, complete the following steps:
1. Securely mount a 20 cm (8 in.) or longer section
of 35 mm (1.4 in.) DIN rail, horizontally and
centered in the desired space.
2. Pull the two bottom mounting clips outward
from the expansion module to the extended
position.
3. Hang the expansion module on the DIN rail by
the hooks at the top of the (DIN rail) channel on
the back of the expansion module, and position
the expansion module snugly against the DIN
rail.
4. Push the bottom mounting clips inward (up) to
secure the expansion module on the DIN rail.
To remove the expansion module from the
DIN rail, pull the bottom mounting clips
out to the extended position and carefully
lift the expansion module off the DIN rail.

Wall mount applications

To mount an expansion module directly on a wall
or other flat vertical surface, complete the following
steps:
1. Pull the two bottom mounting clips outward
and ensure they are locked in the extended
position.
2. Mark the mounting hole locations on the wall
using the provided dimensions and one of the
mount positions, vertical or horizontal. You can
also hold the expansion module up to the wall
or surface in a proper mount position and mark
the hole locations through the mounting clips.
3. Drill holes in the wall or surface at the marked
locations, and insert appropriate wall anchors
in the holes (if necessary).
4. Hold the expansion module in place, and insert
the screws through the mounting clips and into
the holes (or anchors). Carefully tighten all of
the screws.
Important: Do not overtighten the
mounting screws. Overtightening the
screws may damage the mounting clips.
Mounting features and dimensions
See the following figure for mounting dimensions
listed in millimeters and inches. Inches are listed
in parenthesis. The following figure also illustrates
the DIN rail channel and the mounting clips in an
extended position.
IOM3721 Expansion Input/Output Module Installation Guide 3