28
3-2
2
4
1
5
6
7
3
4
5
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
For safety reasons the P.C.B. envisions a fuse
that cannot be restored in series with the electric
power supply of the gas valve.
3.2 230 V CIRCUIT WIRING DIAGRAM.
Ke
y:
A2
-
P.C.B
.
A4
-
D
isp
la
y b
oa
rd
E
1
-
Ig
ni
tio
n e
lec
trode
E
2
-
D
et
ec
tio
n e
lec
trode
G2
-
Ig
ni
ter
M1
-
Bo
iler ci
rcu
la
to
r p
um
p
M20
-
Fa
n
M30
-
Th
re
e-w
ay v
al
ve (o
pt
io
na
l)
Configure the corresponding parameters when
connecting in “simple cascade”, or when con-
necting in “system side flow probe”, or “D.H.W.
pump”.
S1
-
M
ai
n s
w
itc
h
Y1
-
G
as v
al
ve
1
-
Ext
er
na
l r
es
et
2
-
Fr
ee c
on
ta
ct a
la
rm MA
X. 1 A 230 V
ac
3
-
Sys
tem s
id
e p
um
p P
ot
en
tia
l-f
re
e c
on
ta
ct M
ax. 1s
t 230 V
ac.
4
-
Ext
er
na
l r
ela
y (o
pt
io
na
l)
5
-
Co
il 230 V
ac MA
X. 0.1 A
6
-
Ext
er
na
l p
um
p (D
riv
en b
y M1 p
um
p)
7
-
D.H.W
. p
um
p
Col
ou
r k
ey
:
BK
-
Bl
ac
k
BL
-
Bl
ue
BR
-
Br
ow
n
G
-
Gr
een
GY
-
Gr
ey
O
R
-
O
ra
nge
P
-
Pu
rp
le
PK
-
Pin
k
R
-
Re
d
W
-
W
hi
te
W/BK
-
W
hi
te / B
la
ck
Y
-
Ye
llo
w
Y/G
-
Ye
llo
w / G
re
en
