Airwell RT4D 60 [52/56] Guide specification rt4d continued
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Airwell RT4D 60 [52/56] Guide specification rt4d continued

Airwell RT4D 60 [52/56] Guide specification rt4d continued
Page 52
The ignition and the control of the flame shall be automatic.
The burner shall be for two stages heat.
The burner shall be modulating.
HOT WATER
The hot water coil shall be factory fitted downstream from the
DX indoor coil.
The hot water coil shall cover the entire face area of the DX
indoor coil to insure low air velocity and low air pressure drop.
The hot water coil shall be accessible through an hinged double
wall hinged door with 50 mm insulation.
A modulating 3-way valve shall be factory fitted, wired to the
Controller.
A capillary 2-stage freeze-stat shall be factory fitted upstream
from the hot-water coil and wired to the Controller.
The modulating 3-way valve shall be assembled in a
compartment divided from the air flow.
The water connections shall be made from the floor of the
unit.
The hot water circuit shall be protected by a circulating pump
with by-pass.
ELECTRIC HEAT
The electric heater shall be factory fitted downstream from the
DX indoor coil.
The electric heater shall cover the entire face area of the DX
indoor coil.
The electric heaters shall be made of smooth steel tubes wired
for two stages heat to the controller.
The disconnect switch and the circuit breakers of the electric
heat shall be sized for sized and cabled for a single inlet power
connection.
The electric heater shall be protected from overheating with
factory-fitted limit-switches wired to the circuit-breakers and
Controller.
The electric heater shall have 2 (3) stage heat.
ROOF MOUNTING CURB
The roof-mounting-curb shall be supplied knocked-down with
bolts and screws for field- assembling.
The roof-mounting curb shall be made of a 3.0 mm heavy
gauge galvanized steel.
A one side adhesive neoprene gasket shall be supplied by the
manufacturer to join the roof mounting curb to the unit base
and stop vibration and thermal bridge.
The roof-mounting-curb shall be designed with recessed profile
to allow for a field supplied weather tight flashing in the roof
insulation.
AUTOMATION AND CONTROL
The ROOFTOP shall be factory wired and cabled to the
automation- and electric devices, controls- and safety devices,
and Controller ready-to-start.
All electric devices and controls shall be mounted in a control
panel with hinged door and electric heater with thermostat to
eliminate condensation.
The wiring shall comply with CE standards and EN 60204-1.
All cables and wires shall be individually identified.
The unit shall be equipped with one single power inlet
connection, sized to the total current draw of the unit scheduled
in this specification.
The unit shall be furnished with one lockable main disconnect,
sized to the total current draw of the unit, accessible from
outside the cabinet.
The Controller shall be a Direct Digital Microprocessor,
configured at the factory by the manufacturer for all functions
specified here above and run-tested.
The manufacturer software shall offer field adaptive heating
and cooling staging algorithms, dedicated to optimisation of
energy consumption, to satisfy ambient set conditions.
The monitoring of the ambient load, overheating and
overloading, the compressor cycling, dampering, phase and
pressure-control, shall be managed by the controller to insure
safe and automatic year-round operation.
A dry-contact for general alarm shall be available for field
connection.
The standard Direct Digital Controller shall be furnished with a
RS 485 card to permit user to extend the communication of the
ROOFTOP by sending and retrieving binary and analog flexible
informations to read and write via ModBUS.
The DD Controller shall communicate via LONWORKS.
The DD Controller shall communicate via Modem.
The DDC shall be furnished with a time card for field indexing of
unoccupied and occupied modes, day-week and maintenance
scheduling, operation hours, history of the last 150 failures and
alarms with indication of time and day.
The monitoring of the ambient load shall be achieved by a field
mounted room sensor.
The monitoring of the ambient load shall be achieved by a field
mounted return air duct sensor.
The DDC shall be supplied with a User-Interface. The User
Interface shall have a 6 buttons key-pad for field programming
of set-points, proportional bands, alarm threshold and permit
resetting of alarms. The User Interface shall have a LED semi-
graphic 4 lines 20 columns screen with backlight. It shall be
field installed outside the ROOFTOP within 200 m Bus distance
from the Controller.
The user-interface shall be factory mounted on the ROOFTOP.
The user-interface shall be mounted remote from the ROOFTOP.
The software shall be suitable for field indexing of a winter-
summer sliding ambient temperature, with min.-max. setting.
The software shall allow for field setting of a night set-back
winter ambient temperature.
The software shall permit the field adjustment of the minimum
hygienic ventilation requirement in % of the nominal air volume
of the ROOFTOP.
The software shall be field programmable for Variable Air
Volume operation when using Inverters on the blower motors.
The DDC shall hold the desired air pressure in the return air
ductwork constant.
The outdoor air damper shall be controlled by the refrigerant
pressure in the outdoor coil.
Guide Specification - RT4D (continued)

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