Maintenance Of Differential Valve - Vaillant VCW 2O Instructions For Installation And Servicing

Open the water section. Clean the water filter
(O) or replace, if necessary' Check diaphragm
tpj anO water governor (61), replace, if
necessary.
Reassemble in reverse order using new
washers.
Where stuffing gland needs replacing fit new
too to water section, incorporating new stuffing
box.
8.6 Maintenance of differential valve
Mark and disconnect the two unions and
unscrew the three retaining screws (Q).
Ooen differential valve and clean. Check
dihohraom and replace, if necessary. Check
eaiv ruininq pin of diaphragm disc in stuffing
box. In casebi replacement of the stuffing box'
it is recommendable to replace also diaphragm
disc. Lubricate pin with suitable grease.
Mark and disconnect the two control lines and
clean by blowing through.
Reassemble in reverse order.
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