HONEYWELL UNITARY INSTALLATION INSTRUCTIONS-24 VAC/VDC
31-00614-01 12
POWER SUPPLY
General Information
To prevent a risk of injury due to electrical shock and/or
damage to the device due to short-circuiting, low
voltage and high-voltage lines must be kept physically
separate. To prevent a risk of short-circuiting and
damage to your Honeywell Unitary controllers, do not
reverse the polarity of the power connection cables and
avoid ground loops (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
environmental conditions while selecting input and
output devices.
Determine the location of controllers, sensors,
actuators, other input, and 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 sequence of operation
for the controller and the system as a whole. Usually,
some variables must be passed between the controllers
that are required for optimum system-wide operation.
Typical examples are the TOD, occupied, unoccupied,
outdoor air temperature, and demand limit control
signal. Understanding these interrelationships early in
the job engineering process is vital for proper
implementation while configuring the controllers.
NOTE:
All wiring must comply with applicable electrical
codes and ordinances. Refer to the job or
manufacturers’ drawings for details. Local wiring
guidelines (for example, IEC 364-6-61 or VDE
0100) may take precedence over
recommendations provide in these installation
instructions.
To comply with CE requirements, devices having a
voltage of 50-1000 VAC or 75-1500 VDC, but
lacking a supply cord, plug, or other means for
disconnecting from the power supply must have
the means of disconnect incorporated in the fixed
wiring. This type of disconnect 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:
A single transformer can power more than one
controller. The same side of the transformer
secondary must be connected to the same power
input terminal on each controller. Fig 12 on page
14 shows the power wiring details for multiple
controllers. Controller and configuration are not
necessarily limited to three devices, but the total
power draw, including accessories, cannot exceed
100 VA when powered by the same transformer
(U.S. only).
NOTE:
Power must be off prior to connecting or removing
connections from the 24 VAC / VDC power
(24 V~ / 24 V0), and 20 VDC power terminals.
Use the heaviest gauge wire available, up to
18 AWG (1 mm
2
), with a minimum of 22 AWG
(0.3 mm
2
), for all power wiring.
CAUTION
CAUTION
To prevent a risk of short-circuiting and damage
to your controller and external devices, do not
reverse the polarity of the power supply
connection cables.
IMPORTANT:
Power multiple controllers from a single
transformer and connect the same transformer
secondary side to each device same power input
terminal. When connecting power, ensure that
one leg of the 24 VAC / VDC secondary circuit
and the grounded terminal on the device
connects to known earth ground at the panel or
enclosure. Limit the distance of the power wire
running between the device and the transformer
to 15 feet (4.5 meters) and restricted for same
room installation. The transformer must be UL
Listed for smoke control. The transformer also
needs to be mounted and installed in an
enclosure. Use a 15407287 series power supply.
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