Vaillant ecoTEC plus 937 Service Manual download pdf (Page 54)

54 Installation and maintenance instructions ecoTEC plus 937 0020031552_06

8.2.2 Cleaning the integral condensation heat

exchanger

Caution!

Risk of damage to the electronics.

Water may damage the electronics and cause

power failures.

Protect the open switch box from spray

water.

Dismantle the compact thermo module as described

under 8.2.1.

Fig. 8.4 Cleaning the heat-exchanger

Caution!

Possible material damage caused by loos-

ening or retightening the screws.

The primary heat exchanger may become

damaged.

You should neither loosen nor tighten the

four screws (1).

After removal of the burner and fan assembly you can

check the primary heat-exchanger (4).

Remove the loose deposits from the heating coils (3)

with a soft brush and a jet of water. Make sure that

water is kept away from all electrical components.

The water used to clean the primary heat-exchanger

runs away through the condensate siphon. Avoid

pointing the water jet directly at the insulating sur-

face (2) on the back of the heat exchanger.

If necessary, the heat-exchanger can be cleaned using

ordinary vinegar.

8.2.3 Checking the burner

Fig. 8.5 Checking the burner

The burner (1) is maintenance-free and needs no clean-

ing.

Check the surface of the burner for damage. If neces-

sary, replace the burner.

After checking or replacing the burner re-fit the

thermo-compact module as described in Section

8.2.4.

8.2.4 Installing the compact thermal module

Danger!

Possible personal injury and material dam-

age caused by hot exhaust gases.

If you do not renew the seal and the self-lock-

ing nuts on the burner door, hot exhaust

gases may escape and cause personal injury

and material damage.

Replace the seal (1) and the self-locking

nuts each time you open the burner door

(e.g. when conducting maintenance and

service work).

Replace the insulating layer on the burner

door if it exhibits any sign of damage.

Fig. 8.6 Replacing the burner door gasket

Insert a new gasket (1) in the burner door.

8 Inspection and maintenance

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Vaillant ecoTEC plus 937 Service Manual Page 54

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