Mark MEGAFLEX, Technical Manual

Page: 50 / 58

50
As the responsible manufacturer of my products, I’m aware that the above mentioned countries have
adopted the Gas Appliance Directive 2009/142/EC in their national law. I understand that the CE mark
has meaning only in these countries, where the GAD is implemented in the national regulations. Although
other countries might value and respect the CE mark, it has no formal value.
This boiler can be adjusted for category K(I2K) and is in this case suitable for the use of G and G+ dis -
tribution gasses according to the specifications as shown in NTA 8837:2012 Annex D with Wobbe-index
43,46-45,3 MJ/m3 (dry, 0 °C, Hs) or 41,23 – 42,98 (dry, 15 °C, Hs)
This boiler can also be converted and re-adjusted for category E (I2E)
This means that the boiler is : either is suitable for G+ gas and H-gas or provable suitable is for G+ gas
and provable can be made suitable for H-gas as meant by “Besluit van 10 Mei 2016” until changes in this
document are made.
7.2 Adjustment % CO
2
(O
2
%) and check input
The boiler is equipped with an automatic gas/air regulator. This means that the amount of gas is regulated
depending on the amount of air. The % CO
2
needs to be adjusted according to the table below;
Type of boiler Gas type inlet pressure %CO2 * on max load %CO2 * on min load
850-11 G20 / G25/G25.3 20 / 25 mbar 9,3 +0,2-0,05 9,1 +0,15-0,2
1020-13 G20 / G25/G25.3 20 / 25 mbar 9,3 +0,2-0,05 9,1 +0,15-0,2
*For O
2
percentage see Chapter 2 Technical data
The boiler has a gas valve that is connected to a venturi. See figure below ;
Adjustment for max. load ;
• wait until the boiler is stable and measure % CO
2
• if required, correct CO
2
with the throttle ; turning t gives a higher CO
2
percentage (a ½ turn
(180°) causes a change of approximately 0,85 % CO
2
)
Adjustment for min. load ;
• wait until the boiler is stable
• if required, correct the CO
2
with the off-set ; turning to-
wards + gives a higher CO
2
percentage. Note : this offset ad-
justment is very sensitive : half a turn (180°) causes a change
of approximately 1 % CO
2
.
Check on heat input
In the table below the relationship between nominal maxi-
mum input and fan speed and gasflow is given for
G20 as sample. The nominal fan speed can be ± 5%
due to adjustments in production. Write down your
initial settings (between 680 and 850 or between
850 and 1020 kW) for input in the table as shown
in 9.1
Nominal input 850 1020 [kW Hi]
Fan speed nominal 5800 6100 [rpm]
Gasflow G20 90 108 [m3/h]
If the gas flow is too low it may be due to an obstruction
(dirt) in the air/flue system. Check and if necessary clean.
The gas flow must then be re-checked.
Throttle
Off-set