75
ROSSO - RED
NERO - BL
AC
K
MARRONE - BR
OW
N
NERO - BL
AC
K
MARRONE - BR
OW
N
BLU - BL
UE
2.7.2
“DUETTO 20-30-40 OF/30-40 BF” wiring diagram
Fig. 9/a
KEY
IG
Main
switch
R
R
elay
TM
Minimum
tem.
s
tat
TL
Limit
s
tat
VP
Pr
essur
e
s
tat
val
ve
TS
Saf
e
ty
s
tat
E/I
Summer/Wint
er
switch
T
C
Boiler
s
tat
SP
A
W
at
er
pr
essur
e
gauge
tr
igger
ed
light
S
A
P
o
wer
on
light
SB
Bur
ner
“lock
out”
war
ning
light
P
A
W
a
ter
switch
P
Pum
p
sy
s
tem
B
Bur
ner
T
A
R
oom
s
tat
VD
Diver
ter
val
ve
C
R
V
A
43.222
unit
connect
or
s
(op
tional)
SS
Boiler
immer
sion
pr
obe
QA72
1
(op
tional)
SC
Heat
er
immer
sion
pr
obe
QA72
1
(op
tional)
SE
Ext
er
nal
te
m
p
er
atur
e
pr
obe
QA
C3
1
(op
tional)
U
A
R
oom
unit
QAA70
(op
tional)
OP
Time
pr
og
ra
mmer
N
O
TE:
When
connecting
the
room
s
tat
(T
A)
remove
the
br
idge
be
tween
te
rminals
7-8
When
connecting
the
R
V
A
43.222
unit
remove
the
b
r
idge
be
tween
te
rminals
7-8
and
1
7-1
8.
When connecting t
he time prog
r
ammer
(OP) remove t
he br
idge
be
tween
te
rminals
6-7
.
Summary of Contents for DUETTO 20 OF
Page 1: ...Solo Duetto OF BF IT ES PT GB FR BE RO CERTIFICAZIONE DEL SISTEMA DI QUALITA AZIENDALE ...
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