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INITIAl COMMISSIONING
5.9.2 Flue gas measurement UltraGas
®
2 (800-1550)
!
WARNING
The settings on the gas/air compound regula-
tion must only be made by a specialist trained
by Hoval or by Hoval customer service.
Hex socket 2.5 mm
A
Gas restrictor
B
Offset screw
B
A
Fig. 41
Setting procedure:
If you have to make a setting on the venturi,
always check both flue gas values.
For example: set upper value - check lower
value - value is not correct - set lower value -
check upper value - ...
1. Start the “Emission” menu on the control module.
- The control automatically switches to normal oper-
ation after expiration of the remaining run time or
after pressing the “Reset” button.
2.
Position emission meter in the flue gas line.
3. Set the boiler to maximum output (100%).
4. Set the O
2
(CO
2
) value by turning throttle screw A.
-
The flue gas value must lie in the following range:
O
2
= 5.5 - 5.9 (CO
2
= 8.8 - 8.5) % by vol. (dry)
5. Set the boiler to minimum output (1%).
6. Set O
2
(CO
2
) value by turning offset screw B.
-
The flue gas value must lie in the following range:
O
2
= 5.5 - 5.9 (CO
2
= 8.8 - 8.5) % by vol. (dry)
Factory setting: throttle screw A
after the closed condition.
UltraGas
®
2
Type
Diameter X
Bolt as aid
Number of turns
(800,1000)
14.8 mm
17.5 turns
(1100)
19.5 mm
22.5 turns
(1300)
13 mm
16 turns
(1550)
17 mm
20 turns
A bolt with a corresponding diameter
(X mm, see Fig. 42) can be used to help
check the setting.
Ø X mm
Fig. 42
7. Check point 4 again, then point 6.
8.
Measure the NOx and CO content.
- The measured values must lie within the limits pre-
scribed by law. Higher values indicate faulty burner
setting, dirt build-up on the gas burner or heat ex-
changer or a defective gas burner.
§
If the legal limit values or 150 ppm CO are
exceeded, the boiler must be taken out of op-
eration and corresponding repair measures
arranged.
9.
Close the “Emission” menu on the control module.
Summary of Contents for 51-UltraGas 2 1000
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