15
ELECTRICAL SYSTEM
CONNECTOR J14
Figure 13
SET J17 SWITCHES
ON THE OFF POSITION
Figure 14
Figure 15
MAIN
BUS 1
COMMON SENSOR HALL
J1
g
v
m
b
5
J12
2
3
4
7
8
a
7
5
6
6
5
m
m
11
a
J4
2
J9
1
01
a
m
m
4
3
5
1
J11
n
T3
3
1
3
4
2
1
m
6
2
4
a
D
W
9
1
J16
a
2
GAS VALVE
LIMIT THERMOSTAT
NTC - SMOKE
NTC - RETURN
m
b
v
n
g
BLOWN (+ )
INPUT SENSOR HALL
NTC - FLOW
BLOWN (-)
POWER SENSOR HALL
J6
J14
J15
J2
FUSE 4A
F1
J8
J7
3
1
5
a
1
2
3
m
gv
gv
4
gv
1
T1
GROUND
GROUND
GROUND
NEUTRAL
PHASE
TO MAIN
POLO GROUND
LAST SLAVE
J3
2 3
1
PUMP
m
a
PRESSURE SWITCH
24 V AC
X1
6.4
Position of the flow probe
Each unit upper water manifold is equipped with two pock-
ets where the temperature probe has to be inserted. The latter
probe continuously checks the flow temperature of the heating
circuit. Either you are installing a single unit or a battery of them,
the flow probe must always be installed inside the pocket placed
downstream. Of course, in case of more than one unit in battery,
the probe must be inserted in the pocket placed downstream
on the unit closer to the system inlet, as it is shown in (“Figure
16”). The temperature difference read by the probe causes igni-
tion, switching off and modulation of all the thermal elements
in cascade. Installer shall take care to place the probe inside the
pocket which is closer to the system inlet, in accordance to the
water stream.
Sonda di
mandata
Figure 16
