30 Installation and maintenance instructions Ultimate 3 0020239568_03
12 Inspection and maintenance
12.1 Complete Service Interval Record section
▶ After servicing, complete the relevant Service Interval
Record section of the Benchmark Checklist located on
the inside back pages of this document.
12.2 Using original seals
If you replace components, use only the enclosed original
seals; additional sealing materials are not required.
12.3 Observing inspection and maintenance
intervals
▶ Adhere to the minimum inspection and maintenance in-
tervals. The inspection may require maintenance to be
carried out earlier, depending on the results.
– Inspection and maintenance work (→ Appendix)
12.4 Checking the CO₂ content
1. Start up the product with the check programme (P.01)
and set the value.
– Setting value for the programme P.01: 100
Check programmes – Overview (→ Page 36)
2. Wait until the value that is read is stable.
– Waiting period for reading a stable value: 5 min
3. Unscrew the cover from the flue gas analysis point (1).
4. Measure the CO₂ content at the flue gas analysis point
(1).
5. Compare the measured value with the corresponding
value in the table.
Checking the CO₂
content
Removed
front casing
Fitted front
casing
Natural gas H Natural gas H
CO₂ at full load 9.0 ±1.0 vol. % 9.2 ±1.0 vol. %
CO at full load ≤ 250 ppm ≤ 250 ppm
CO/CO₂ ≤ 0.0031 ≤ 0.0031
◁ The value is OK.
▽ The value is not OK; you cannot start up the
product.
▶ Set the CO₂ content. (→ Page 30)
12.5 Setting the CO₂ content
Condition: The CO₂ content must be adjusted
▶ Remove the sticker.
▶ Turn the screw (1) to set the CO₂ content (value with
front casing removed).
◁ To increase the CO₂ content: Turn anti-clockwise
◁ To decrease the CO₂ content: Turn clockwise
▶ Only carry out the adjustment in increments of 1/8 turn
and wait approximately 1 minute after each adjustment
until the value stabilises.
▶ Compare the measured value with the corresponding
value in the table.
Setting the CO₂ con-
tent
Removed
front casing
Fitted front
casing
Natural gas H Natural gas H
CO₂ at full load 9.0 ±0.2 vol. % 9.2 ±0.2 vol. %
Set for Wobbe index
W₀
14.09 kW⋅h/m³ 14.09 kW⋅h/m³
O₂ at full load 4.5 ±1.8 vol. %
CO at full load ≤ 250 ppm ≤ 250 ppm
CO/CO₂ ≤ 0.0028 ≤ 0.0028
▽ If the setting is not in the specified adjustment range,
you must not start up the product.
▶ Inform Customer Service.
▶ Check whether the requirements regarding air pollution
control and/or CO have been complied with.
▶ Install the front casing.
12.6 Removing the gas-air mixture unit
Note
The gas-air mixture unit consists of three main
components:
– Fan
– Gas valve assembly
– Burner hood
1. Switch off the product via the main switch.
2. Close the gas stopcock.
3. Remove the front casing. (→ Page 15)
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