Filling/Draining The Heating Installation; Filling The Unit And Heating Installation; Draining The Unit; Draining The Entire Installation - Vaillant ecoTEC exclusive 832 Installation And Maintenance Instructions Manual

8.3

Filling/draining the heating installation

8.3.1

Filling the unit and heating installation

The filling of the appliance and the heating system is de-
scribed in Section 6.1.

8.3.2 Draining the unit

• Close the maintenance cocks (if fitted) on the appliance.
• Open the drain valves on the maintenance cocks.

8.3.3 Draining the entire installation

• Attach a hose to the filling/draining cock on the system.
• Bring the open end of the hose to an appropriate
drain point.
• Check that the maintenance cocks of the boiler are
open.
• Open the filling/drain cock.
• Open the bleed valves on the radiators.
Start at the highest radiator and then work from the
top to the bottom.
• When the water has drained out of the heating sys-
tem, close the bleeding valves on the radiators and
close the filling/drain cock again.
8.4

Servicing the compact thermal module

8.4.1

Dismantle compact thermal module

The compact thermal module consists of a speed-con-
trolled fan, the gas fitting, the gas mixer pipe for the fan
pre-mix burner and the pre-mix burner itself. These four
individual parts form the compact thermal module com-
ponent.
d Danger!
Danger of explosion through gas leakage!
The mixer tube between the gas control unit
and burner must not be opened. It can only be
guaranteed that this component is gas-tight
after it has been inspected at the factory.
d Danger!
There is danger of being burned or scalded at
the compact thermal module and at all compo-
nents carrying water. Only carry out work on
these components once they have cooled down.
Proceed as follows to dismount it:
• Turn the appliance off on the main switch.
• Isolate the unit from the electrical mains.
• Cut off the gas supply to the device.
• Close the maintenance cocks on the appliance.
• Remove the front cover from the device.
• Swing off the electronic box.
ecoTEC exclusive installation and maintenance instructions / 0020017768_04
Inspection and maintenance 8
Fig. 8.1 Dismantling compact thermal module
• Remove the screw (3) and remove the air inlet pipe (1)
from the inlet spigot on the gas fitting.
• Separate the gas supply pipe (6) on the gas fitting.
Secure the gas corrugated pipe against twisting by
bracing the pipe on the wrench surface while loosen-
ing the union nut.
a Caution!
Damage to the gas pipe!
Under no circumstance may the compact
thermal module be suspended from the flexible
corrugated gas pipe.
• Pull the two plugs of the ignition und grounding lines
off the ignition electrode (4).
• Only ecoTEC exclusive 832: Pull the cable plug off the
fan motor and the cable off the gas fitting.
Only ecoTEC exclusive 838: Open the mains coupling
to the fan.
• Undo the five nuts (2).
• Pull the entire compact thermal module (5) off the
heat exchanger.
• After dismantling the burner and the heat exchanger,
check for damage and dust and, if necessary, clean
the components as described below.
1
2
3
4
5
6
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