Vaillant ecoCRAFT VKK GB SERIES Installation And Maintenance Instructions Manual - page 26
Installation and maintenance instructions ecoCRAFT - 0020055744_03
26
6.4 Filling
the
system
• Flush the entire heating system thoroughly before fill-
ing.
Corrosion protection by water treatment
In the case of heating water that has been conditioned
by the addition of strongly alkaline substances, alumini-
um and its alloys are at risk from corrosion.
The pH of the heating water must not exceed a value
of 8.5.
6.4.1
Filling the heating side
• Release the cap on the customer side automatic air
vent by one or two turns. Make sure that the opening
of the cap does not point towards the electronic com-
ponents.
• Fill the installation up to a system pressure of 2.3 to
2.5 bar. The current water pressure will be displayed if
the "-" button is pressed for approx. 3 seconds.
• Fill the installation via the boiler filling and draining
device provided on the installation.
• Close the bleed nipple.
• Bleed the radiators.
• Read the pressure again on the pressure gauge. If the
installation pressure has fallen, the installation should
be filled up again and vented once again.
• Check all connections and the entire system for leaks.
You can use the P0 test program to bleed the heating
circuit, the boiler and, if necessary, the cylinder.
• To do this, keep the "+" button pressed for approx
5 seconds while switching on the mains.
• Select P0 with the "+" or "-" buttons.
• Start the program with the "i" button.
• Step forward to the cylinder charging circuit by press-
ing again.
6.4.2 Filling
the
siphon
• Fill the siphon with water through the opening in the
flue gas collector.
d
Danger!
Risk of poisoning from leaking flue gas!
If the device is operated with an empty
condensate siphon, there is a risk of poisoning
from the escaping flue gases. Be absolutely
certain, therefore, to fill the siphon before
starting up.
6.5
Checking the gas setting
The unit is set to the values quoted in Chapter 12 "Spec-
ifications" in the factory. In some areas these settings
may need to be adjusted at the installation site.
To ensure proper functioning of the combined gas/air
controller, the O
2
-/CO
2
concentration in the flue gas (see
Section 6.5.2) and also the gas pressure ahead of the
gas valve (see Section 6.5.1) must be measured.
The checking and setting is carried out at both the rated
and the minimum loading.
a
Caution!
Before start-up of the unit compare the details
concerning the set type of gas on the
identification plate with the type of gas supply
at the installation site.
It is not necessary to check the quantity of
gas. The adjustment takes place on the basis of
the CO
2
component in the flue gas.
The appliances are delivered as Natural Gas G20 vari-
ants.
6 Start-up