Airedale Chilled Water Cassette 2kW - 11kW - Manual (Page 21)

22 Technical Manual: 6806236 0 /20
CHILLED WATER CASSETTE
Identification
Code
T2
9079103
The electronic board, fitted inside the electrical panel, can manage different control modes so as to best satisfy the
requirements of the installation. These modes are selected by suitably positioning the configuration dipswitches,
which define the following main functions:
t
2 pipe / 4 pipe system:
dip switch N.ro 1 = ON/OFF
t
0QFSBUJPO
without / with remote control:
dip switch N.ro 3 = ON/OFF
t
$POUJOVPVT
WFOUJMBUJPO
dip switch N.ro 4 = ON
t
$MPTF
WBMWF
BOE
TUPQ
GBO
JO
DPPMJOH
BVUPGBO
GVODUJPO

dip swicth N.ro 4 = OFF N.ro 5 = ON N.ro 6 = OFF
t
$MPTF
WBMWF
BOE
TUPQ
GBO
JO
IFBUJOH
NPEF
BVUPGBO
GVODUJPO

dip swicth N.ro 4 = OFF N.ro 5 = OFF N.ro 6 = OFF
t
$MPTF
WBMWF
BOE
TUPQ
GBO
JO
CPUI
DPPMJOH
BOE
IFBUJOH
NPEF
BVUPGBO
GVODUJPO

dip swicth N.ro 4 = OFF N.ro 5 = ON N.ro 6 = ON
The autofan function allows the simultaneous on/off control of the water valve and the fan, while at the same time
optimising the operation of the unit. When reaching the set point, the controller closes the water valve (valve off)
and only 3 minutes later stops the fan, so as to correctly compensate for the valve closing time. To prevent the air
probe from measuring an incorrect temperature, when the fan is off the controller runs a number of fan ON cycles
to annul the effect of any stratification of the air in the room.
The autofan function can be activated in cooling only mode, in heating only mode or in both operating modes.
In two pipe systems, a water probe can be installed on the supply pipe to the unit upstream of the water valve.
Based on the temperature read in this section of the pipe, the device will select either cooling or heating operation.
The electronic board also features a contact for connection to a window switch or remote enabling signal. When
the contact is closed, the unit can operate, when the contact is open, the unit stops. The same contact can be used
for starting and stopping the unit from an external timer or any other remote switching device.
In addition, a series of units can be switched on or off at the same time, by using a flip-flop switch connected to
the terminals present on the board.
Sensors that require a 12 volt power supply, for example occupancy sensors, can be connected to other terminals
on the electronic board and then to the on/off contacts. The board is able to power external sensors with a maximum
current of 60mA.
Suitable for units with infra-red remote control only.
The NTC sensor, if connected to the T2 contact of the board, works like a change-over: fitted in contact to the supply
pipe it controls automatically the winter/summer switch in accordance to the water temperature.
T2 Change-Over for infra-red remote control (accessory)
Unit with infra-red remote control