Three way diverter valve
1
Function
The diverter valve
A
(Fig. 1) has the function of modify-
ing the hydraulic circuit of the boiler by means of an
electriccommandgiven by the electronic control p.c.b.
in order to send the water that exitsthe primary heat ex-
changer towards the c.h. system or towardsthe d.h.w.
heat exchanger.
A
Fig. 1
2
Checks
n
Check the electrical continuity
Fig. 2 indicates the relationship between the electric
command coming from the electronic control p.c.b.
and the position of the actuator
B
(brassspindle) when
the boiler operates in
d.h.w. mode.
Fig. 3 indicates the relationship between the electric
command coming from the electronic control p.c.b.
and the position of the actuator
B
(brassspindle) when
the boiler operates in
c.h. mode.
the actuator and the resistance of the motor windings
(the motor must be disconnected from the wiring) is
also given.
B
wh
rd
bk
rd =red
wh=white
bk =black
0V
1
2
0V
Spindle B
not visible
Open circuit
2.6 Kohm
3
1
2
Fig. 2 --- D.h.w. mode
B
rd =red
wh=white
bk =black
120V
0V
wh
rd
bk
Spindle B
visible
Open circuit
2.6 Kohm
3
1
2
Fig. 3 --- C.h. mode
3
Removal of the electric actuator
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
1
Remove the front case panel.
2
Disconnect the connectors
C
(Fig. 4).
D
and remove the
actuator
E
.
Reassemble the actuator carrying out the re-
moval operations in the reverse order.
When reassembling the actuator, refer to Fig. 2 or
to the wiring diagram in section 3.1 for the correct
wiring connection.
RIVA FP SERVICE MANUAL - REV A
(edition-0106)
Third Part
