77
2.7.2
“DUETTO 20-30-40-PR 40 OFi/30-40 BFi” wiring diagram
Fig. 9/a
KEY
IG
Main switch
R
R
elay
TM
Minimum t
em. 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
PI
C.H. pum
p
PB
D.H.W
. pum
p
B
Bur
ner
TA
R
oom s
tat
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 t
e
m
p
er
atur
e pr
obe QA
C3
1 (op
tional)
U
A
R
oom unit QAA70 (op
tional)
OP
Time pr
og
rammer
N
O
TE: When connecting t
he r
oom s
tat (T
A)
remove t
he br
idge be
tween t
e
rminals 1
7-1
8.
When connecting t
he R
V
A 43.222 unit r
emove
the br
idge be
tween t
e
rminals 1
3-1
4 and 1
7-1
8.
When connecting t
he time pr
og
rammer (OP)
remove t
he br
idge be
tween t
e
rminals 1
5-1
6.
Summary of Contents for DUETTO 20 OFi
Page 1: ...Solo OF BF Duetto OFi BFi IT ES PT GB CERTIFICAZIONE DEL SISTEMA DI QUALITA AZIENDALE ...
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