Final Tests; Final Test Heating System; Change Of Pilot Jet - Vaillant VCW 2O Instructions For Installation And Servicing

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E-7 Eryansion vessel (sealed heating
system onlY)
lnec* internal pressure of expansion vessel
*nir*r should be 0,7 to 0,9 bar' if heating
srstem of appliance is without pressure (black
:'al of build-in pressure gauge at 0). Refill with
ar pump, if necessary.
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8.8 Final tests
8.8.1 Final test heating system
Close all drain screws and nipples and open the
service cocks to refill the appliance. lf a sealed
svstem ensure the pressure is 1.2 bar
a-ccording to 6.3. Switch on electricity, turn on
qas and start the appliance as outlined on the
;ticker at the inner side of the f ront door. Check
flame failure device for correct functioning.
Check the pilot flame and adjust with the pilot
rate adluster (7) so that there are three
seoarate flames. lf the flame profile is one
larqe, loose flame, increase gas rate until 3
seiarate flames develop, as shown in fig. 60a'
Replace pilot jet if necessary.
Check the appliance for soundness.
Check all controls for correct functioning'
reassemble outer casing of appliance as
under 7.
8.8.2 Final test electrical system
Check -
earth continuity
polarity
resistance to earth
according to INSTRUCTIONS FOR BBITISH
GAS MULTIMETER.
8.9 Change of Pilot iet
Disconnect the pilot tube from the pilot' Change
pilot jet and washer and reassemble in reverse
ordbr.
In case of an open-flued appliance remove the
pilot assembly by unscrewing the retaining
bcrew. Changb the pilot jet and reassemble in
reverse order.
Check connections for gas soundness.
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