Three Way Diverter Valve; Function; Checks; Removal Of Electric Actuator - Biasi RIVA COMBI Service Manual

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Third Part
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Three Way Diverter Valve

1) Function

2) Checks

3) Removal of the Electric Actuator
4) Removal of the Diverter Group and Its
Internal Parts
1 Function
The diverter valve A (Figure 1) has the function
of modifying the hydraulic circuit of the boiler by
means of an electric command given by the
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. storage tank coil.
2 Checks
A Check the electrical continuity
Figure 2 indicates the relationship between the
electric command 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 3 indicates the relationship between the
electric command 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 actuator and the resistance of the
motor windings (the motor must be disconnected
from the wiring) is also given.
RIVA COMBI SERVICE MANUAL – REV A
A
Figure 1
(edition-0106)
Push the shaft of the diverter mechanism C
(Figure 4) and check that there are no
mechanical obstructions
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 and the side panels of the
boiler.
2) Disconnect the connectors D (Figure 5).
Three Way Diverter Valve
Figure 2 (D.h.w. Mode)
Figure 3 (C.h. Mode)
C
Figure 4
5-1