Installation Instructions

Document No. 586-280
Installation Instructions
Rev. 1, March, 2002
MEC0073R1
Figure 1. Modular Equipment Controller (MEC)
Generic Example.
Installation
There are two options for installation:
• Mounting the MEC on a surface is for energy
management only.
• Mounting the MEC inside an MEC enclosure
is for smoke control applications and CE
compliance.
CE Compliance Requirements
For installations requiring CE compliance, the MEC
must be installed in a metal enclosure rated at IP20
minimum.
A ferrite clamp must be clamped around any cable
permanently attached to the Man Machine Interface
(MMI) port. Ferrite clamps can be ordered in a 10-
pack kit (587-669). Contact your Siemens Building
Technologies representative for more information.
NOTE: The clamp must be installed so that it is
within one inch of the MMI connector.
MECs with FLN meet CE compliance
requirements (except the 549-901) without
modification.
CAUTION:
Class I wiring must be kept away from all
Class II wiring. Class I and Class II wiring
are required by UL to be kept separate
from each other.
NOTE: When installing the MEC with HOA control
switches (549-008, 549-010, 549-031, 549-
032, 549-033, 549-901), verify that all control
switches are in the AUTO position.
Mounting on a Surface
For energy management only
CAUTION:
Do not install the MEC on a vibrating
surface (for example, an air handler or
ductwork).
1. Align the MEC on the mounting surface. The
MEC must be positioned to provide a 3-inch
minimum clearance on both the left and right
sides for wires to ports and connectors.
2. Using the mounting ears on the back of the
controller as a template, mark the position of the
four mounting holes on the surface.
3. Drill the four mounting holes, or start the screws
into the marked template holes.
4. Secure the controller using the appropriate
mounting hardware for the surface.
5. Terminate wires to both the power supply and
appropriate connectors.
The installation is now complete.
Mounting in an MEC Enclosure
Required for smoke control applications
WARNING:
Turn off AC power to the MEC enclosure
at a circuit breaker panel.
1. Carefully align the MEC on the perforated
backplane of the enclosure (Figure 2).
2. Using the rear of the controller as a template,
mark the position of the four mounting holes.
3. Start the screws (provided with the enclosure) in
the perforated backplane.
4. Place the MEC on the backplane of the enclosure
so that the mounting ears rest on the screws and
tighten the four screws.
5. Terminate wires to both the power supply and
appropriate connectors.
The installation is now complete.
If you need more information on the MEC service
box, see the MEC Service Box Installation
Instructions (586-135).
Page 2 of 3 Siemens Building Technologies, Inc.