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Commissioning
29
7717773-02 12.18
Gas valve VGU 86 S
4. Commissioning
4.1 Supply pressure
Supply pressure
The supply pressure must lie between the following values:
For natural gas: - min. 18 mbar
- max. 25 mbar
For liquefied gas:- min. 42.5 mbar
- max. 57.5 mbar
The supply pressure is measured as flow pressure at the measuring nozzle of the
gas valve.
The heating system must not be started up when the supply pressures are outside
the said range. The gas supply company should be informed.
4.2 Setting the CO
2
con-
tent
The CO
2
value is set by adjusting the jet pressure at the gas valve.
If the appliance is used in areas with fluctuating natural gas composition, the CO
2
content must be adjusted in accordance with the Wobbe index at any given time
(ask the gas supply company).
The CO
2
content to be set can be decided as follows:
CO
2
content = 8.5 - (W
oN
- W
ocurrentl
) × 0.5
- Gas type LL (natural gas L with Wobbe index W
oN
= 12.4 kWh/m
3
)
- Gas type E (natural gas E with Wobbeindex W
oN
= 15.0 kWh/m
3
)
Caution!
Check the CO
2
content at full load and partial load.
The CO
2
content for both full load and partial load must lie between the values that
are listed in the installation manual for the gas-fired condensing boiler.
Use the enclosed Torx 15 key to make adjustments.
The air quantity set in the factory must not be changed.
Note: Excessive CO
2
values may lead to unhygienic combustion (high CO values)
and damage to the burner. Insufficient CO
2
values may lead to ignition problems.
4.3 Presetting for the re-
placement gas valve
VGU 86S
WGB boilers
Export boilers
WHBx
Export boilers
WBx
Max. heat
load
Number of turns of the full load
adjusting screw in the "-" direction
kW
natural gas
propane
WGB / BGB / BBS 15
-
-
15
13
16
WGB / BGB / BBS / BSK 20 -
-
20
12
15
WGB-K 20/24
-
-
24
11
14
WGB / BGB / BBS 28
-
-
28
11
14
WGB / BGB 38
-
-
38
6
9
WGB 50
-
Moorea 50
Paramount 50
50
2
5
-
-
Paramount 60
58
2
5
BBK 22
-
-
22
12
15
Содержание VGU 86 S
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Страница 64: ...August Brötje GmbH 26180 Rastede broetje de 7717773 03 08 20 ...