Johnson Controls PENN System 450 Series Installation Instructions Manual page 2

Location Considerations
Observe the following System 450 location guidelines:
• Ensure that the mounting surface can support the
module assembly, mounting hardware, and any
(user-supplied) panel or enclosure.
• Mount the modules upright and plugged together in
a horizontal row where possible (Figure 3). DIN rail
mounting is highly recommended.
• Mount modules on flat even surfaces.
• Allow sufficient space for wires and connections.
• Mount the modules in locations free of corrosive
vapors and observe the ambient operating
conditions listed in the Technical Specifications.
• Do not mount the modules on surfaces that are
prone to vibration or in locations where radio
frequency or electromagnetic emissions may
cause interference.
• Do not install the modules in airtight enclosures.
Do not install the modules in an enclosure with
heat-generating devices that may cause the
temperature to exceed the ambient operating limit.
Mounting
You can mount System 450 modules on 35 mm DIN rail
(recommended) or directly to an even wall surface.
To mount modules on DIN rail:
1. Provide a section of 35 mm DIN rail that is longer
than the module assembly width, and mount the
DIN rail horizontally in a suitable location using the
appropriate mounting hardware.
2. Clip the control module on the rail, position the
upper DIN rail clips on the top rail, and gently snap
the lower clips onto the rail.
2 System 450™ Series Control Module with Ethernet Communications Installation Instructions
3. Clip the remaining modules to the right of the
control module on to the DIN rail and plug the 6-pin
module connectors together (Figure 3).
Note: If your System 450 control system uses a
power module, the power module must be plugged
into the right side of the control module.
To direct-mount modules to walls and other flat
surfaces using the four keyhole slots:
1. Plug the modules together, remove the module
covers, place the module assembly horizontally
against the wall surface in a suitable location, and
mark the mount hole locations on the mounting
surface (Figure 1).
Note: The four keyhole slots on the
communications control module are not accessible
from the front (even with the cover removed). Use
another System 450 module to mark the
communications module mounting hole locations
on the mounting surface.
2. Install appropriate screws or fasteners, leaving the
screw heads approximately one to two turns away
from flush to the surface.
3. Position the assembly mounting slots over the
screw heads, and then carefully tighten the
mounting screws to secure the assembly to the
surface.
Note: The mounting screws on a communications
module cannot be accessed or tightened after the
module is attached to the screws. The enclosure
has a ramp molded into the keyhole slots, which
allows you to mount the module on the screw
heads.
Note: If you mount the modules on an uneven
surface, use shims or washers to mount module
assembly evenly on the surface.
Refer to the input sensor installation instructions for
information on locating and mounting control sensors.