Airwell RT4D 20 [7/56] Automation and controls
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Airwell RT4D 20 [7/56] Automation and controls

Airwell RT4D 20 [7/56] Automation and controls
Page 7
Automation and Controls
The RT4D is assembled and wired at the factory with all the
necessary automation and control devices.
It is fully tested at the factory and shipped READY-TO-START to ease
the start-up and commissioning on site.
The electrical and control board is mounted in weatherproof
cabinet with hinged door, separated from the air flow.
The automation and the control devices mounted on the board
are accessible without disturbing the operation of the unit.
The electrical wiring complies with the CE standards and
EN 60204-1.
The cables and the wires are identified to ease trouble-
shooting.
One main lockable disconnect is accessible from outside
without touching the cabinet.
The main disconnect is sized for all electrical features supplied
with the RT4D.
There is one cable and wire inlet on the low side of the cabinet
for field connection.
A connection in the floor of the RT4D within the roof mounting
curb is optional.
A general alarm with dry-contact for field connection is
optional.
The Direct Digital Controller is programmed at the factory.
All year-round operations, heating and cooling, with dedication
to energy-saving and safety are programmed at the factory :
staging of cooling and heating to satisfy ambient setting,
ambient load monitoring, compressor cycling, defrost and
overloading control.
The electrical and control panel is equipped with an electric
heater, controlled by an ambient thermostat to operate at low
ambient temperature.
The setting of the minimum outdoor air for the ventilation rate
of the building to satisfy the hygienic requirements is done at
the controller.
The compensation of the winter/summer ambient temperatures
is optional.
The room sensor can be replaced by an optional return air duct
sensor.
The night set-back temperature or unoccupied mode,
maintenance scheduling, the hours of operation, the history of
the last 150 failures and alarms with the indication of day and
hour of the failure, are optional with a time card.
A user-interface is optional. The user interface has a LED semi-
graphic 4 lines 20 columns screen, backlight for the edition
of actual values, set-points, hours of operation and alarms
with a 6 buttons key-pad for field-programming of set-points,
proportional bands and alarm threshold.
The user interface can be field installed remote (max. 200 m)
or located at the RT4D in the panel. A second remote user
interface is possible.
A SMS warning via GSM is optional.
A ModBus communication to a BMS is optional with a RS485
card.
A LonWorks communication to a BMS is optional.
An optional interface to MODEM is possible.

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