5.16
Wiring diagram
5.16.1 Boiler
MIQ2
1
2
3
230 V
50 Hz
N
L
L
N
24
25
26
27
SPAC
BR
BK
IG
NA
C NC
PAC
Line
L
N
Neutral
Safety thermostat
TS
Summer / winter switch
E/I
Room thermostat
TA
Hot water tank thermostat
TB
TC
Boiler thermostat
Temperature-limit thermostat
TL
Main switch
IG
High-efficiency calorifier pump
PB
– To connect the room thermostat (TA), remove the jumper between terminals 20-21.
– To connect the programmer timer-controlled thermostat (CTP), remove the jumper between terminals 30-31.
– For the burner's electrical connections, consult the documentation supplied with the installed appliance.
m
CAUTION
Users must:
– To mount an omnipolar residual-current circuit
breaker conforming to EN standards that allows for
completely disconnecting the system in overvoltage
category III conditions (that is, with a gap of at least 3
mm between the open contacts)
– Respect the connections L (Live) - N (Neutral).
– Ensure that the special power cable is only replaced
with a cable ordered as a spare part and connected
by professionally qualified personnel.
84
4
5
6
7
8
9
TL
E/I
TMIN
TB
1
C
SA
2
28
29
30
31
32
33
MIQ1
R
2
1
5
3
CTP
PI
B
B1
KA1-KA2
TB
SA
SPAC
.
11
10
8
2
7
KA1
6
4
3
5
1
10
11
12
13
14
15
PB
1
2
5
6
13
9
10
14
11
12
3
4
7
8
KA2
System pump
Burner with direct supply
Burner with permanent supply
(e.g. SIME FUEL 25/35 EV)
Relè
Hot water tank thermostat
Voltage indicator light
Water pressure switch activa-
tion indicator light
m
CAUTION
Users must:
– Connect the earth wire to an effective earthing sys-
tem. The manufacturer is not responsible for any dam-
age caused by failure to earth the appliance or failure
to observe the information provided in the wiring dia-
grams
a
WARNING
The grey cable (GR), when not used, MUST be removed
from the terminal block MIQ
d
IT IS FORBIDDEN
To use water pipes for earthing the appliance.
16
17
18
19
20
21
TC
11
12
TA
21 24
TS
GR
BL
BR
B4 S3 T2 T1 N
L1
B1
BR
BL
N
L
B
Water pressure switch
PAC
CTP
Timer-controlled programmer
thermostat (optional)
Minimum-temperature thermostat
TMIN
Blue
BL
Brown
BR
BK
Black
Grey
GR
Red
R
.
.
EN
22
23
PI
Fig. 25