Change Of Micro-Switches Of Water Section; Change Of Overheat Cut-Off Device; Change Of Electronic P.c.b. - Vaillant VCW 2O Instructions For Installation And Servicing

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8.30 Change of micro-switches of water
section
Open control box as in 8.28 and remove switch
box as in 8.23. Remove the adjustment screw
(C5) and take off the microswitch assembly.
Pulloff AMP plugs (C4).
Reassemble in reverse order.
Check - earth continuity
- PolaritY
- resistance lo earth
according to INSTRUCTIONS FOR BRITISH
GAS MULTIMETER.
8.31 Change of overheat cut-off device
Open the control box as in 8.28 and remove the
switch box as in 8.23.
Pull off the 2 plugs (CG) and the earth lead,
remove the saddle clip (C7), pull the sensor
(3, fig. 52) out of the main heat exchanger.
Unsciew the 2 retaining screws (C8), release
grommet from box and remove cut-off device.
Reassemble in reverse order.
Check - earth continuity
- Polarity
- resistance to earth
according to INSTRUCTIONS FOR BRITISH
GAS MULTIMETER.
Check connections for gas soundness.
8.32 Change of electronic P'c.b'
Open the control box as outlined under 8.28.
L
Uirscrew the retaining screw (C9) on the left
rt
hand side of the control box. P.c.b. is held on
key-hole slot, pull p.c.b. forward and to the
right. Pull off multiplug and white lead.
Reassemble in reverse order and ensure the
p.c.b. is located on the left hand side of plastic
peg.
Check - earth continuity
- polarity
- resistance to earth
according to INSTRUCTIONS FOR BRITISH
GAS MULTIMETER.
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