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INITIAl COMMISSIONING
5.8
Setting the gas quantity,
measuring the CO
2
(O
2
) and
NOx/CO content in the exhaust gas
!
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.
5.8.1 UltraGas
®
(1550) exhaust gas measure-
ment
Hex socket 2.5 mm
A
Gas restrictor
B
Offset screw
B
A
Fig. 20
Setting procedure:
If you have to make a setting on the venturi,
always check both exhaust 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 ope-
ration after expiration of the remaining runtime or
after pressing the “Reset” button.
2. Position emission meter in the exhaust gas line.
3. Set the boiler to maximum output (100%).
4. Set the CO
2
(O2) value by turning throttle screw A.
- The exhaust gas value must lie in the following
range:
CO
2
= 8.5 - 8.8 (O2 = 5.9 - 5.5) % by vol. (dry)
5. Set the boiler to minimum output (1%).
6. Set CO
2
(O2) value by turning offset screw B.
- The exhaust gas value must lie in the following
range:
CO
2
= 8.5 - 8.8 (O2 = 5.9 - 5.5) % by vol. (dry)
Factory setting: throttle screw A
Type (1550): 15.5 mm = 18.5 turns
after the closed condition.
A bolt with 15.5 mm diameter can be used
to help check the setting.
Ø 15.5 mm
Fig. 21
7. Check point 4 again, then point 6.
8.
Measure the NOx and CO content.
- The measured values must lie within the limits
prescribed by law. Higher values indicate faulty bur-
ner setting, dirt build-up on the gas burner or heat
exchanger or a defective gas burner.
§
If the legal limit values or 150 ppm CO are
exceeded, the boiler must be taken out of
operation and corresponding repair measures
arranged.
9.
Close the “Emission” menu on the control module.
Summary of Contents for UltraGas 1550
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