Checking The Charge Pressure Of The Expansion Vessel; Checking The Gas Flow Pressure; Checking Co 2 Content - Vaillant ecoTEC plus SERIES Installation And Maintenance Instructions Manual

12 Inspection and maintenance
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12.10 Installing the compact thermal module
> Attach the compact thermal module (2, ¬ fig. 12.10) to
the heat exchanger (1, ¬ fig. 12.10).
> Tighten the four nuts (9, ¬ fig. 12.10) crosswise until the
burner door fits closely and uniformly onto the mating
surfaces.
> Attach the plug of the ignition line (7, ¬ fig. 12.10) and
the ground connection (8, ¬ fig. 12.10) to the ignition
electrode.
> Attach the plug (4, ¬ fig. 12.10) to the fan motor.
> Attach the three plugs to the gas valve (5, ¬ fig. 12.10).
> Attach the cable to the venturi (3, ¬ fig. 12.10).
12.11 Tightening the cap nuts on the gas valve
> Connect the gas supply (6, ¬ fig. 12.10) to the gas valve
with a new seal.
When the cap nuts are being screwed to the gas valve,
counterhold the opposite side of the gas valve or tighten
both of the gas valve cap nuts simultaneously.
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> Open the gas isolator cock on the boiler and ensure
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there are no leaks.
> Check that the sealing ring in the air intake pipe is posi-
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tioned correctly in the seal seat.
> Insert the air intake pipe (1, ¬ fig. 12.3) back into the
intake stub.
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> Attach the air intake pipe using the retaining screw (2,
¬ fig. 12.3).
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12.4.7 Checking the charge pressure of the
expansion vessel

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-
ing installation, ideally with nitrogen, otherwise with air.
Ensure drain valve on boiler is open during topping up.
> If water escapes from the measuring stub pipes (1) of the
expansion vessel, you must replace the expansion vessel.
12.5

Checking the gas flow pressure

> Check the gas flow pressure (¬ section 10.11.4).
12.5.1 Checking CO
> Check the CO
content (¬ section 12.1.3).
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Installation and maintenance instructions ecoTEC plus 0020116700_01
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