Installing The Compact Thermal Module; Checking The Charge Pressure Of The Expansion Vessel - Vaillant ecoTEC VU Installation And Maintenance Instructions Manual

12 Inspection and maintenance

12.3.6 Installing the compact thermal module

Danger!
a
Risk of death and risk of damage caused
by hot flue gas!
If you do not renew the seal and the self-
locking nuts on the burner door, hot flue
gases may escape and cause personal
injury and material damage.
> Replace the seal each time you open the
burner door.
> Replace the self-securing nuts each time
you open the burner door.
> If the burner flange insulation on the
module shows signs of damage other
than small cracks it must be replaced
(article number 193 595).
10
9
8
7
12.10 Installing the compact thermal module
> Attach the compact thermal module (4, ¬ fig. 12.10) to
the heat exchanger (1, ¬ fig. 12.10).
> Tighten the four nuts (3, ¬ fig. 12.10) crosswise until the
burner door fits closely and uniformly onto the mating
surfaces (If a torque spanner is available, set at 6 Nm).
> Attach the plug of the ignition line (10, ¬ fig. 12.10) and
the ground connection (9, ¬ fig. 12.10) to the ignition
electrode.
> Attach the plug (5, ¬ fig. 12.10) to the fan motor.
> Attach the plug (8, ¬ fig. 12.10) to the gas valve.
58
12.11 Secure the gas pipe against twisting
> Tighten either the cap nut (6, ¬ fig. 12.10) on the gas
valve or the cap nut (7, ¬ fig. 12.10) between the gas
pipes. Use a new seal for this.
> Secure the gas pipe against twisting (¬ fig. 12.11) by
holding the pipe against the spanner flat when tighten-
ing the cap nut.
> Open the gas isolator cock on the boiler and ensure
there are no leaks.
> Check that the sealing ring in the air intake pipe is posi-
1
tioned correctly in the seal seat.
2 > Insert the air intake pipe (1, ¬ fig. 12.3) back into the
intake stub.
> Attach the air intake pipe using the retaining screw (2,
3
¬ fig. 12.3).
4
12.3.7 Checking the charge pressure of the
5
expansion vessel
6

12.12 Checking the charge pressure of the expansion vessel

The service valves of the boiler must be closed.
> Measure the charge pressure of the expansion vessel at
the testing nozzle (1) of the vessel with the boiler depres-
surised.
> Top up the expansion vessel at a pressure of less than
0.75 bar in accordance with the static height of the heat-
Installation and maintenance instructions ecoTEC 0020173113_01
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