Change Of Thermometer; Change Of Manometer; Change Of System Bypass - Vaillant VCW 2O Instructions For Installation And Servicing

8.34 Change ol thermometer
Pull the temperature sensor (U3) out of the
sensor tube. Press the 2 tongues into the
thermometer and pull it out to the front side'
Reassemble in reverse order.
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8.35 Change of manometer
Disconnect the tubing nut (U1) ot the control
line and remove the fixing nut (U2).
Reassemble in reverse order.
8.36 Change ol system bYPass
Close off flow and return service cocks and
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drain boiler as outlined in 8.1.2'
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Unscrew the 2 union nuts (V) and remove
valve. Unscrew the 3 screws holding the top ol
the valve. Renew diaphragm or spring as
necessary. Do not move spring adjusting nut'
Reassemble in reverse order, using new
wasners.
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