Service manual

Service manual E000129004
8
2.8. Three-way diverter valve
The three-way valve 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 comes from the c.h. system or
from the d.h.w. heat exchanger towards the pump and
the main heat exchanger.
Fig. 21
On the motor body an indicator is visible with which it is
possible to know the position of the diverter valve.
Fig. 21 and Fig. 22 indicate the relationship between the
positions of the indicator A and the consequent hydraulic
function.
Fig. 22
F Check of electrical completeness
Warning: isolate the boiler from the mains
electricity supply before removing any covering or
component.
Fig. 23 demonstrates the relationship between the
position of the indicator and the electrical resistance of
the motor.
Fig. 23
If the valve is complete the resistance measured will be
approx. 8 kOhm.
F Removal of the motor
Warning: isolate the boiler from the mains
electricity supply before removing any covering or
component.
1 Remove the cover (section 1.4).
2 Release the electrical connector from the motor body.
3 Press the push-button B placed in the rear side of the
motor body (Fig. 24) and rotate the motor anti-clockwise,
releasing it from the hydraulic group.
Fig. 24
4 Reassemble the motor carrying out the removal
operations in reverse order.
30K
30K
Heatin
g
position Hot water position
30K