3. Adjust combustion
The condensing boiler is factory preset to Natural Gas E, H (G20).
The O
2
content must be checked and if necessary adjusted.
If the WTC is operated with Liquid Petroleum Gas continue with chapter "Changing
Set O
2
content at maximum rating
▶
Open gas isolating valve.
▶
Manually drive rating to maximum (see Ch. 6.4).
▶
Check combustion and if necessary adjust.
When changing the rotational direction of setting screw
1
, the O
2
content only
changes after approx.
1
/
2
a rotation.
▶
Set O
2
content at the setting screw (Inbus 2.5)
1
to table:
▪
Clockwise rotation = O
2
content increases
▪
Anticlockwise rotation = O
2
content decreases
Set O
2
content at minimum rating.
▶
Manually drive rating to minimum (see Ch. 6.4).
▶
Check combustion and if necessary adjust.
▶
Set O
2
content at the setting screw (Inbus 2.5)
2
to table:
▪
Anticlockwise rotation = O
2
content increased
▪
Clockwise rotation = O
2
content reduces
O
2
minimum rating
O
2
maximum rating
Natural Gas
4.6 % ±0.2
4.3 % ±0.2
Installation and operating instruction
Gas condensing boiler WTC-GB 90-A
7 Commissioning
83266502 • 1/2010-08 • La
56-95
