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Wiring diagram :
The setting of the temperature on the
high/low thermostat (f.i. 65°C) has to
be inferior to that of the first step
thermostat (f.i. 80°C). In this way, if the
boiler is cold and if there is a heat
demand, the burner will start with its
wholepower and once the65°C reached,
it will continue to burn with reduced
power until the water temperature of
theflowrises to 80°C.If the heat demand
is to important that the water
temperature falls down instead of
reaching 80°C, than the whole power
will engage again.
Remark:
As far as Ecosets are concerned are the
electrical connections of the circula-
tion pump of the heating circuit made in
the control box outisde the boiler
control panel.
4.3. Electrical connection
T6
T7
T8
T2
T1
N
L1
L
N
2
1
P
2
1
P
4
1
5
2
P
1
2
2
3
4
5
6
7
8
9
1
1
2
4
5
6
7
8
9
10 11
15
20 21
L
N
L
N
16
12
B5
B4
17
S3
13
18
B
4
S
3
T
2
T
1
N
L
1
B
5
T
6
T
7
T
8
Safety limit
SP-051 HE
(110°C)
230V ca-50Hz
NT 174 HE/2
2
nd
step
thermostat
(30 - 90°C)
P
o
w
e
r
su
p
p
ly
sw
it
c
h
w
it
h
p
h
ia
l
Circulation pump
heating circuit
(not supplied)
Remote
thermostat
(not supplied)
Circulation pump
water tank
(not supplied)
Remove the 4 bridges
when you connect a
digital regulator E9.0631
NT 174 HE/2
1
st
step
thermostat
(30 - 90°C)
