Change Of Thermo-Magnet; To Open The Control Box; Change Of Main Switch Board - Vaillant VCW 2O Instructions For Installation And Servicing

8.27 Change of thermo-magnet
Remove the switch box as outlined under 8.23.
Remove micro-switch assembly by unscrewing
the 2 retaining screws (88). Skaighten tap
washer (B9), unscrew retaining nut (B10), pull
out thermo-magnet (B1 1) carefully. Re-
assemble in reverse order.
Check - earth continuity
-
Polarity
- resistance to earth
according to INSTRUCTIONS FOR BRITISH
GAS MULTIMETER.
Check connections for gas soundness.
8.28 To open the control box
lsolate the appliance from the electrical mains.
Open the main terminal box by removing the
r e t a i n i n g s c r e w ( C 1 ) . R e m o v e t h e f o u r
retaining screws (C2).
Lift up the switch box and pull out slowly the
control box cover complete with the switch
board, printed circuit and terminal board. Pull
off the multiple plugs from the printed circuit.
Reassemble the box in reverse order. When
replacing the screws, position the 2 star
washers diagonally to the screws.
8.29 Change of main swilch board
Take off the switch board as outlined under
8.28. Disconnect the mains cable from the
terminals. Unscrew the 2 retaining screws (C3)
and remove the p.c.b. with the main switch from
the crontrol box cover.
Reassemble in reverse order.
Check - earth continuity
- polarity
- resistance to earth
according to INSTRUCTIONS FOR BRITISH
GAS MULTIMETER,
<G>
.-
3
rig. e6
<88
b
,z-4.
r ( t -
"v4-
Fig. BB
42