Filling/Draining The Boiler And Heating Installation; Filling The Boiler And The Heating Installation; Draining Of The Boiler; Draining The Entire System - Vaillant ecoTEC VU 466/4 Installation And Maintenance Instructions Manual

8 Inspection and maintenance
8.2 Filling/draining the boiler and heating
installation
8.2.1

Filling the boiler and the heating installation

A description of how to fill the boiler and heating
installation is provided in Chapter 6.2.

8.2.2 Draining of the boiler

• Close the service valves of the boiler.
• Open the drain valves on the service valves.
• Open the automatic air vent on the air separator to
allow the boiler to drain completely.

8.2.3 Draining the entire system

• Attach a hose to the draining device on the system.
• Bring the open end of the hose to an appropriate
drain point.
• Make sure that the service valves of the boiler are
open.
• Open the drain valve.
• Open the bleeding valves of the radiators.
Start from the highest radiator and then work from
the top to the bottom.
• Once the water has drained off, close the bleeding
valves of the radiators and the drain valve.
8.3

Maintenance of the compact thermal module

8.3.1

Dismounting the compact thermal module

The compact thermal module consists of the speed
controlled fan, the gas/air combination valve, the gas
feed (mixture pipe) to the fan premix burner and the
premix burner itself. These four individual parts form the
compact thermal module component.
H

Danger!

Danger of burning or scalding!

There is danger of being burned or scalded at
the compact thermal module and at all water-
carrying components. Only carry out work on
these components once they have cooled down.
To dismount the compact thermal module proceed as
follows:
• Turn off the boiler by the main switch.
• Isolate the boiler from the electrical mains.
• Cut off the gas supply to the boiler.
• Remove the front casing of the boiler.
• Swing off the electronic box.
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1
2
3
Fig. 8.2 Removing air intake pipe
• Remove the screw (2) and remove the air intake pipe
(1) from the intake stub.
• Disconnect the gas supply line (3) at the gas valve. To
prevent the corrugated gas pipe from twisting when
loosening the cap nut, hold up the pipe at the spanner
flat.
Installation and maintenance instructions ecoTEC 0020029172_03