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BACnet IP/MSTP VAV Controller - INSTALLATION
INSTRUCTION
POWER SUPPLY
General Information
To prevent a risk of injury due to electrical shock and/or damage
to device due to short-circuiting, low-voltage and high-voltage
lines must be kept physically separate from one another. Further,
to prevent a risk of short- circuiting and damage to your unit, do
not reverse the polarity of the power connection cables, and
avoid ground loops (i.e., avoid connecting one field device to
several controllers).
Before wiring the controller, determine the input and output
device requirements for each controller used in the system.
Select input and output devices compatible with the controller
and the application. Consider the operating range, wiring
requirements, and the environment conditions when selecting
input/output devices.
Determine the location of controllers, sensors, actuators and
other input/output devices and create wiring diagrams for
illustrations of typical controller wiring for various
configurations.
The application engineer must review the control job
requirements. This includes the sequences of operation for the
controller, and for the system as a whole. Usually, there are
variables that must be passed between the controllers that are
required for optimum system wide operation. Typical examples
are the TOD, Occ/Unocc signal, the outdoor air temperature,
the demand limit control signal, and the smoke control mode
signal.
It is important to understand these interrelationships early in
the
job
engineering
process,
implementation when configuring the controllers.
NOTE:
NOTE:
All wiring must comply with applicable electrical codes
and ordinances. Refer to job or manufac- turers'
drawings for details. Local wiring guide- lines (for
example, IEC 364-6-61 or VDE 0100) may take
precedence over recommendations pro- vided in these
installation instructions.
To comply with CE requirements, devices having a voltage
of 50-1000 VAC or 75-1500 VDC but lack-
31-XXXX-XX
to
ensure
proper
12
Prelim Draft - Brand Neutral
ing a supply cord, plug, or other means for discon- necting
from the power supply must have the means of
disconnection incorporated in the fixed wiring. This type
of disconnection must have a contact separation of at
least 1/8 in. (3 mm) at all poles.
Power Wiring
All wiring must comply with applicable electrical codes and
ordinances, or as specified on installation wiring diagrams.
Controller wiring is terminated to the screw terminal blocks
located on the device.
NOTE:
NOTE:
For multiple controllers operating from a single
transformer, the same side of the transformer sec- ondary
must be connected to the same power input terminal in
each controller.
All loads on the controller must be powered by the same
transformer that powers the controller itself. A controller
can use separate transformers for controller power and
output power.
The 24 VAC power from an energy limited Class II power source
must be provided to the controller. To conform to Class II
restrictions (U.S. only), the transformer must not be larger than
100 VA.
Figure. 9 on pg 13
depicts a single controller using one
transformer.
IMPORTANT:
Power must be off prior to connecting to or removing
connections from the 24 VAC power (24 V~/24 V0), and 20
VDC power (20 VDC) terminals.
Use the heaviest gauge wire available, up to 18 AWG (0.8
mm2), with a minimum of 22 AWG (0.3 mm2), for all
power wiring.
CAUTION
CAUTION
Where multiple devices are powered from a single
transformer, the same side of the transformer
secondary must be connected to the same power input
terminal in each device.
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