Combustion Unit; Fan And Mixer; Removing The Siphon Fig. 37); Replacing Interface - Riello Vokera VISION PLUS 20 S User Instructions

7.21.2 TRANSFORMER
Carry out component removal procedure as described in 7.9.
Unscrew the screw that fixs the transformer and remove it.

7.22 COMBUSTION UNIT

Refer to 7.9 and carry out the component removal procedure.
- Remove the casing as indicated in paragraph "7.10 CASING
REMOVAL ("Fig. 25")"
- Disconnect the electrode connection cables.
- Disconnect the fan power cables.
- Remove the mixer clip (A).
- Loosen the gas ramp nut (B).
- Remove and rotate the gas train.
Remove the 4 nuts (C) together with the gasket (E) and extract
the air / gas conveyor assembly including fan and mixer taking
care not to damage the insulating panel and the electrodes.
Check the integrity of the burner insulation panel and the seal-
ing gasket and replace it if necessary, following the appropriate
procedure.

7.23 FAN AND MIXER

Refer to 7.9 and carry out the component removal procedure.
Completely unscrew the 2 screws (B) and loosen the 2
screws (C) to extract the fan.
Unscrew the 3 screws (A) that fix the mixer to the fan and
remove it.
To disassemble the non-return valve (clapet - D) completely
unscrew the 2 screws (C).
Once all the operations have been completed, reassemble
all the components operating in the opposite direction to that
described.
Restore voltage and gas supply to the boile

7.24 REMOVING THE SIPHON FIG. 37)

Refer to 7.9 and carry out the component removal procedure.
- Take out the condensate collection pipe
- Unscrew the SRD device
- Unscrew the screw (A) and remove the plate (B)
- Take out the inside part (C) of the siphon .
Once the operations are finished, put back the components in
the reverse order to that described, checking the gasket and se-
aling OR are correctly positioned.

7.25 REPLACING INTERFACE

Refer to 7.9 and carry out the component removal procedure.
Remove the appliance PCB as detailed in 7.12.
and remove the securing screws that hold the interface to
the control panel, and gently lift the interface away from the
panel. Disconnect the 4-wire plug from the interface, noting
it's position.
Replace in the reverse order, ensuring that the interface
is correctly located and engaged with the corresponding
interface buttons (also refer to 7.23).

7.26 REPLACING PCB OR INTERFACE

When either the PCB or interface has been replaced, it may be
necessary to re-programme the parameters of the appliance to suit
the personalised settings, e.g. enable clock, appliance, type, etc.
Check that the following parameters are matched to suit the needs
of the specific installation/application.
P3.01
P3.02
P3.03
P3.06
P3.07
P3.08
P3.09
P3.10
Fig. 34
Fig. 35
Fig. 36
Locate
Fig. 37
B
C
A
E
C
D
B
A
A
B
C
35