304 C – 02/06 D – pag. 10/16
The single compressor board has been designed so as to support two connected terminals, allowing therefore
data access from two different points; it can also work without any connected terminal, ensuring this way a total
safety to the data.
Second tandem board
It represents an expansion of the main board. The connection areas are the following (clockwise):
•
analog inputs (
B4
and
B5
) for the probes connection (relative to the second circuit)
•
24V terminal (with D.C.) for the supply of any pressure probe
•
digital inputs (from
ID8
to
ID11
) for safety connections (relative to the second circuit)
•
digital relay outputs to manage any controlled device
•
the
Y2 GND
analog output for the connection of the optional boards for the management of condensation fans
(ON/OFF regulation mode or with continuous rotation speed variation)
•
the flat cable for the connection to the single compressor main board
•
P1
pin-strip relative to the Y2 analog output (to be normally left open, except in particular situations – see
parameters F3 and F4).
User Interface (Terminal)
The terminal allows the access to the data of the unit. On the terminal there are 5 LED indicators to indicate the
status of the unit, the status of the compressors (ON/OFF) and the timer for compressors/pump after 100
operating hours. An internal buzzer signals any maloperating in the unit.
Display -
The display consists of 3 digits, with the automatic display of the decimal point between -19.9 and +
19.9°C; outside this measurement range, the value is automatically displayed without decimal (although in its
inside the machine is always operating by taking into account the decimal part). During the normal operation, the
displayed value corresponds to the temperature being read by the probe B1, that is the evaporator water in-let
temperature.
Status of the unit -
The User is informed of the status of the unit by means of five LED indicators on the terminal
display and two LED indicators (yellow and green) placed on the main board.
