Vaillant aquaPLUS VUI 362-7 Service Manual download pdf (Page 35)

Servicing 9

Instructions for installation and servicing aquaPLUS VUI 362-7 35

9.3 Cleaning the burner and primary heat exchanger

• Turn off the boiler.

• Isolate the electrical supply to the boiler.

• Remove the boiler case as described on page 15.

• Turn off the gas service valve.

• Turn off the boiler CH service valves.

• Turn off the cold water inlet service valve.

• Release the three clamps (1), remove the combustion

chamber cover (2) and then remove the flue gas

connector (2a) on the fan.

• Remove the retaining spring (3).

• Remove both plugs (4) and two tubes (5) from the fan

assembly.

• Remove the fan assembly (6).

• Remove the four screws (7) and detach the front

cover panel from the combustion chamber (8).

• Check the burner (9) and heat exchanger fins (10) and

remove any loose deposits with a soft brush.

• Reassemble in reverse order.

Check central heating expansion vessel.

• Release the system water pressure from the boiler.

• Remove valve cap from expansion vessel charge point.

• Check that the internal charge pressure of expansion

vessel is between 0.7 - 0.9 bar. If pressure is lower

than this the vessel should be re-pressurised using an

air pump.

• Refit valve cap.

• Open central heating service valves and re-pressurise

the boiler and heating system if necessary.

• Open the gas service valve.

• Turn on the mains power supply.

• Operate the boiler and carry out soundness, safety

and function checks.

• Complete the service interval record section in the

Benchmark gas boiler commissioning checklist and

leave with the user.

9.4 Draining the domestic hot water system (if

required)

• Turn off the cold water supply at the cold water

service valve.

• Release the pressure in the boiler by opening the hot

water taps.

• The

power store can now be drained from the two

drain points under the boiler (one on the cold water

inlet pipe, the other on the outlet pipe of the domestic

hot water heat exchanger).

Note: It is not necessary to carry out the following

check every year – a check every three years should be

sufficient.

Fig. 9.1: Cleaning the burner and primary heat exchanger

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Vaillant aquaPLUS VUI 362-7 Service Manual Page 35

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