Maintaining The Secondary Heat Exchanger - Vaillant ecoTEC exclusive 832 Installation And Maintenance Instructions Manual

8 Inspection and maintenance
Fig. 8.6 Installing compact thermal module
> Place the entire compact thermal module (5) onto the
integral condensation heat exchanger.
> Tighten the five nuts (2) across the diagonal until the
burner door fits closely and uniformly onto the mat-
ing surfaces.
> Insert the ignition cable and the earth cable of the
ignition electrode (4).
> Only ecoTEC exclusive 832: Insert the cables on the
fan motor and the cable on the gas fitting. Only eco-
TEC exclusive 838: Close the mains coupling to the
fan.
> Connect the gas supply (6) with a new gasket to the
gas fitting. Use the spanner flat at the flexible gas line
to hold the gas line.
a
Danger!
Risk of poisoning and explosion due to
escaping gas!
Damage to pipes and seals or loose screws
can result in leaks.
> Open the gas supply.
> Check the unit for gas leaks with leak
detection spray. Check the screwed connec-
tion (6) particularly carefully.
> Check that the blue gasket in the air intake pipe (1) is
correctly located in the gasket seat.
> Insert the air intake pipe on the suction nozzles and
secure the pipe with the retaining screw (3).
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8.5

Maintaining the secondary heat exchanger

1
a
Danger!
Risk of scalding and burns from hot compo-
2
nents!
There is a risk of being scalded or burned on
all water-carrying components.
> Allow the components to cool down before
starting work.
3
b
Caution!
4
Risk of material damage from being
splashed with water!
5
If you fail to protect the electronics box ade-
quately, water can penetrate the box when it
is being cleaned and damage the electronics.
> Protect the electronics box from being
6
splashed with water when it is folded down.
i
When removing the secondary heat
exchanger, protect the opening in the appli-
ance from dirt contamination!
Fig. 8.7 Cleaning the secondary heat exchanger
> Isolate the appliance from the house electricity circuit
(see Section 8.3) and close the gas supply.
> Close the maintenance cocks -if fitted- and the cold
water inlet valve on the inlet combination, and drain
the appliance.
> Release the nut (4) on the secondary heat exchanger.
> Release the clamp (1) on the preference changeover
valve.
> Release the clamps (2) and (3) on the secondary heat
exchanger.
> Remove the secondary heat exchanger to the side.
> Flush the secondary heat exchanger thoroughly with
clean water.
> When re-assembling, use new O rings and flat seals,
the part numbers can be obtained from the parts
catalogue.
Installation and maintenance instructions ecoTEC exclusive 0020017768_07
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