Change Of Pilot Gas Filter; Change Of Automatic Valve Stuffing Box; Change Of Switch Box - Vaillant VCW 2O Instructions For Installation And Servicing

8.21 Change of pilot gas filter
Remove pilot gas line from the pilot gas filter by
disconnecting the union nut (G6). Unscrew the
pilot gas filter from the gas section.
Reassemble in reverse order, using suitable
sealing compound sparingly.
Check connections for gas soundness.
8.22 Change of automatic valve stuffing box
Disconnect the differential valve as under 8.6.
Control lines remain connected. Unscrew the
stuffing box (G7), taking care not to bend the
oin. Reasemble in reverse order. usino new
wasner.
Check connections for gas soundness.
8.23 Change of switch box
lsolate the appliance from the electrical mains.
Mark the pilot lines, disconnect the tubing nuts
and remove oilot lines.
Pull the thermocouple out of the pilot burner
assembly and unscrew the retaining union nut
(82) from the switch box.
Remove the 2 retaining screws (Bl) and pull
out the switch box. Note the colour codes of the
wiring and pull the AMP plugs from the micro
switches.
Reassemble in reverse order.
Check - earth continuity
- polarity
-
resistance to earth
according to INSTRUCTIONS FOR BRITISH
GAS MULTIMETER.
Check connections for gas soundness.
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v