Flushing The Heating Installation For The First Time ("Cold"); Filling The Condensate Siphon; Filling The Condensate Trap; Gas Ratio Setting - Vaillant ecoTEC plus VU GB 656/4-5 A Installation And Maintenance Instructions Manual

circuit or the hot water circuit. The display shows
the filling pressure of the heating installation.
17. To be able to carry out the purging process properly,
the heating installation filling pressure must not fall be-
low the minimum filling pressure.
–
Minimum heating installation filling pressure:
0.08 MPa (0.80 bar)
Note
The check programme P.0 runs for
6.5 minutes per circuit.
At the end of the filling procedure, the
filling pressure of the heating installation
should be at least 0.02 MPa (0.2 bar) above
the counter-pressure of the expansion
vessel ("Exp") (P
(0.2 bar)).
18. If there is still too much air in the heating installation at
the end of the check programme P.0, repeat the check
programme.
19. Check all connections for leaks.
6.9 Flushing the heating installation for the first
time ("cold")
Note
The complete heating system must be flushed
at least twice: Once with cold water and once
with hot water in accordance with the following
instructions.
1. Check whether all thermostatic radiator valves and both
service valves on the product are open.
2. Connect a hose to the drain valve that is located at the
lowest position in the heating system.
3. Open the radiator valves and the drain valves so that
the water can drain quickly. Start at the next point in the
system and open the purging valves on the radiators so
that the contaminated water can completely drain.
4. Close the drain cocks.
5. Refill the heating system with water.
6. Check that the expansion relief valve of the heating
system is functioning correctly by turning the handle
on the valve.
7. Check the pressure in the heating system and top up
with water if necessary.
8. Close the filling valve and the cold water valve.
6.10

Filling the condensate siphon

Danger!
Risk of poisoning due to escaping flue
gas.
An empty or insufficiently filled condensate
siphon may allow flue gas to escape into the
room air.
▶
Fill the condensate siphon with water be-
fore starting up the product.
0020214491_01 ecoTEC plus Installation and maintenance instructions
≥ P
+ 0.02 MPa
Installation Exp
6.11

Filling the condensate trap

Danger!
Risk of poisoning due to escaping flue
gas.
An empty or insufficiently filled condensate
trap may allow flue gas to escape into the
room air.
▶
Fill the condensate trap with water before
starting up the product.
1
1. Install the condensate trap's cartridge (1) in accordance
with the enclosed installation manual.
2. Fill the condensate trap in accordance with the en-
closed description.
6.12

Gas ratio setting

6.12.1 Checking the factory setting
Caution.
An incorrect gas group setting may cause
operating faults or a reduction in the
working life of the product.
If the product design does not match the local
gas group, malfunctions will occur or you will
have to replace product components prema-
turely.
▶
Before you start up the product, compare
the gas group information on the identific-
ation plate with the gas group available at
the installation site.
The product's combustion has been factory tested and is
preset for operation with the gas group indicated on the iden-
tification plate. In some supply areas, these settings may
need to be adjusted at the installation site.
Conditions: The product design is not compatible with the local gas
group
▶
Do not start up the product.
Start-up 6
19