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If 2 terminals (local or remote) are connected to the same single compressor board, they need to be addressed;
therefore, set the two deep-switches called "address" placed on the terminals to 01 (the dip-switch which is placed in the
more external side of the electronic component must be set in ON position; this procedure must be effected only in one of
the 2 terminals). Remember to set parameter H8=1 as well.
Meaning of dip-switches located on the rear side of terminal
On the rear side of terminal there are 4 dip-switches for managing particular functions, as follows:
Address=0:
1 terminal connected to the single compressor board - default
Address=1
: if 2 terminals are connected to the single compressor board, set one of the two dip-switches as follows:
= 0: buzzer always inhibited
= 1: buzzer enabled
(see parameter P4) - default
Keypad=0:
terminal inhibited
Keypad=1:
terminal enabled - default
Pressure probes
The inputs for the control of condensation (B3 and B5) can be arranged so as to accept either Carel NTC temperature
probes or pressure transducers with 4÷20mA (in this case by suitably setting parameter /3 and pin-strips P4 and P5 located
on the main board). The pressure transducers has to be connected to boards with 24V terminal.
8 Optional boards
8.1 Serial card RS485
The Serial card RS485 allows you to interface the µchiller to a supervisory network in RS485 standard (asynchronous). The
card has 4 dip switches that enables you to extend the µchiller addressing up to 199 units.
Mounting
Operations to be carried out for correct mounting:
1.
Disconnect power supply from the µchiller;
2.
Insert the RS485 card on the SERIAL connector of the main board;
3.
When making the connection of the serial line, pay attention to polarities as shown.
The serial line must be closed by means of a 120 - 1/4W resistance, placed between the TX/RX+
and TX/RX- terminals of the µchiller at the end line of the network.
Set up
The network address of the µchiller is selected through the HA parameter and dip switch bank present in the card. The
actual address is obtained by adding HA to the offset obtained from the following table:
Offset
Dip 1
0
16
32
48
off
64
80
96
112
128
144
ON
160
For example, if the HA value is 12 and the dip 1 is in the ON state, the address value is: 12 + 128=140.
RG66000889-REV.OO
Dip 2
Dip 3
off
off
ON
off
ON
ON
off
off
ON
34
Dip 4
off
ON
off
ON
off
ON
off
ON
off
ON
off
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