10
2 - Electrical connections
2.3 EXAMPLE OF WIRING DIAGRAM (HEAT COOL CONTROL)
B
Fuse
[5]
6
SupervisionPower supply
RS485
4…20mA
CT Current transformer 50 mA
Fuse
[5]
Power
supply
switch
OP2
OP1
V
~
PTC
[4]
18V
5
4
3
2
1
12
11
10
9
8
7
0P4
RX/TX
[6]
16
15
Fuse 2A~T
[6]
Alarm
V
~
OP2
18
17
14
13
OP3
[6]
V~
TC
Heating
V~
V~
Cooling
Retransmission
[3]
Notes:
1] Make sure that the power supply
voltage is the same indicated on
the instrument.
2] Switch on the power supply only
after that all the electrical connec-
tions have been completed.
3] In accordance with the safety reg-
ulations, the power supply switch
shall bring the identification of the
relevant instrument. The power
supply switch shall be easily acces-
sible from the operator.
4] The instrument is is PTC protect-
ed. In case of failure it is suggest-
ed to return the instrument to the
manufacturer for repair.
5] To protect the instrument internal
circuits use:
- 2AT fuse for 220Vac relay outputs;
- 4 AT fuse for 110Vac relay outputs;
- 1 AacT fuse for Triac outputs.
6] Relay contacts are already pro-
tected with varistors.
Only in case of 24 Vac inductive
loads, use model A51-065-30D7
varistors (on request)
M4UK.ed6 20-05-2005 11:43 Pagina 10
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