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Three way diverTer valve
8 three way diverter valve
8 .1 function
The diverter valve A (Figure 8.1) has the function of modifying the
hydraulic circuit of the boiler by means of an electric command
given by the electronic control p.c.b. in order to send the water
that exits the primary heat exchanger towards the c.h. system or
towards the d.h.w. heat exchanger.
figure 8 .1
a
8 .2 checks
warning: check the electrical continuity .
Figure 8.2 indicates the relationship between the electric com-
mand coming from the electronic control p.c.b. and the position
of the actuator B (brass spindle) when the boiler operates in
d .h .w . mode
.
Figure 8.3 indicates the relationship between the electric com-
mand coming from the electronic control p.c.b. and the position
of the actuator B (brass spindle) when the boiler operates in
c .h .
mode
.
In both figures the relationship between the position of the actua
-
tor and the resistance of the motor windings (the motor must be
disconnected from the wiring) is also given.
figure 8 .2
bk = black
Open circuit
9,4 Kohm
3
bn
bu
bk
2
1
bu = blue
bn = brown
230 V
0 V
b
Spindle visible
D.h.w. mode
figure 8 .3
bk = black
Open circuit
9,4 Kohm
3
bn
bu
bk
2
1
bu = blue
bn = brown
0 V
230 V
b
Spindle not visible
C.h. mode
8 .3 removal of the electric actuator
warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove the front case panel.
2 Disconnect the connectors C (Figure 8.4).
3
Remove the fixing spring D and remove the actuator E.
Reassemble the actuator carrying out the removal operations
in the reverse order.
When reassembling the actuator, refer to Figure 8.3 or to the
wiring diagram in section 3 for the correct wiring connection.
