67
If the interior of the boiler looks heavily polluted with dust / dirt, then a full service should be performed even
with acceptable combustion readings (CO/CO
2
ratio).
Put the boiler back into operation and carry out a ue gas analysis (see page 55).
Always put back the cover after (maintenance) work and secure it with screws A and B.
Note: During routine servicing, and after any maintenance or change of part of the combustion
circuit, the following must be checked:
Checking the CO
2
- Check the CO
2
readings at full load and low load as described in section 13.1
Checking CO readings and Combustion Performance (CO/CO
2
ratio)
- Check CO readings and Combustion Performance as described in Section 13.2
The combustion reading (CO/CO
2
ratio) must be less than 0.004. If the combustion reading (CO/CO
2
ratio)
is greater than this, and the integrity of the complete ue system and combustion circuit seals has been
veried, and the inlet gas pressure and gas rate are satisfactory either:
- Perform the ‘Full Service’.
- Perform ‘Setting the Gas Valve’.
15.2 Full Service
For reasons of safety and economy, it is recommended that the boiler is serviced annually. Servicing must be
performed by a competent person in accordance with BS 7967-4.
After servicing, complete the relevant Service Interval Record section of the Benchmark Checklist located on
the inside back page of this document.
Where a full service is required the following steps must be followed:
- Carry out the actions as described in section 15.1 Interim Service.
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