Technical data

37Installation and maintenance instructions ecoTEC exclusive 0020017768_05
8.2 Filling/draining the heating installation
8.2.1 Filling the unit and heating installation
The filling of the appliance and the heating system is
described in Section 6.1.
8.2.2 Draining the unit
• Close the maintenance cocks (if fitted) on the appliance.
• Open the drain valves on the maintenance cocks.
8.2.3 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
system, close the bleeding valves on the radiators and
close the filling/drain cock again.
8.3 Servicing the compact thermal module
8.3.1 Dismantle compact thermal module
The compact thermal module consists of a
speed-controlled 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 component.
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.
Danger!
There is danger of being burned or scalded at
the compact thermal module and at all
components 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.
5
4
3
2
1
6
Fig. 8.2 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
loosening 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.
Inspection and maintenance 8