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Installation and maintenance instructions ecoTEC 0020029173_01
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 Chap. 6.2.
8.2.2 Draining of the boiler
• Close the service valves of the boiler.
• Open the drain valve on the return line connection.
• To drain the boiler completely, open:
- the automatic air vent on the air separator,
- the bleed nipple on the flow line connection.
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 cock.
• Open the bleed valves on the radiators.
Start from the highest radiator and then work from
the top to the bottom.
• Once the water has drained off, close the automatic
air vents of the radiator and the drain cock.
8.3
Maintenance of the compact thermal module
8.3.1
Dismounting the compact thermal module
The compact thermal module consists of the
variable-speed 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.
1
2
3
4
5
6
7
8
9
10
Fig. 8.2 Dismounting compact thermal module
• Unfasten the fixing screw on the air intake
pipe (
3
).
• Swing the air intake pipe (
2
) forwards.
• Remove the air intake pipe from the intake port.
• Disconnect the two plugs for the ignition and
grounding connections from the ignition electrode (
5
).
• Disconnect the gas supply (
9
) on the bottom of the
gas valve.
• Disconnect the cable (
7
) from the coupling plug in the
feed to the fan motor, the PWM signal cable on the
bottom of the fan (
8
) and the cable to the gas valve
(
10
).
• Undo the six nuts (
4
).
a
Caution!
Damage to gas supply!
Under no circumstance may the compact
thermal module be suspended from the flexible
corrugated gas pipe.
• Pull off the entire compact thermal module (
6
) from
the heat exchanger (
1
).
• After dismounting the burner and heat exchanger,
check for damage and soiling – clean the components
if necessary as described below.
Inspection and maintenance 8
Содержание ecoTEC VU 656/4
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