Maintenance; 10.1 General - Baxi MainEco Heat 15 Installation And Service Manual

10

Maintenance

10 Maintenance

10.1 General

WARNING
When changing components ensure that both the
gas and electrical supplies to the boiler are isolated
before any work is started. When the component has
been changed recommission the boiler as described
in Section 7.
The Case Front Panel MUST seal effectively against
the boiler side panels.
Flue Sampling
Point
Plug
Analyser Probe
Fig. 35
After refitting the sampling point
plug ensure there is no leakage
of products !
48 MainEco Heat
1. 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 B.S. 7967-4.
2. After servicing, complete the relevant Service Interval Record
section of the Benchmark Commissioning Checklist at the rear of
this publication.
During routine servicing, and after any maintenance or
change of part of the combustion circuit, the following
must be checked:-
• The integrity of the complete flue system and the flue seals
by checking air inlet sample to eliminate the possibility of
recirculation. O 2 20.6% & CO 2 < 0.2%
• The integrity of the boiler combustion circuit and relevant
seals.
• The operational gas inlet pressure and the gas rate as
described in Section 7.5.1.
• The combustion performance as described in 'Check the
Combustion Performance' below.
3. Competence to carry out Checking Combustion
Performance B.S. 6798 'Specification for Installation &
Maintenance of Gas Fired Boilers not exceeding 70kWh' advises
that:-
• The person carrying out a combustion measurement should
have been assessed as competent in the use of a flue gas
analyser and the interpretation of the results.
• The flue gas analyser used should be one meeting the
requirements of BS7927 or BS-EN50379-3 and be calibrated
in accordance with the analyser manufacturers' requirements.
• Competence can be demonstrated by satisfactory completion
of the CPA1 ACS assessment, which covers the use of
electronic portable combustion gas analysers in accordance
with BS 7967, Parts 1 to 4.
4. Check the Combustion Performance (CO/CO 2 ratio)
Set the boiler to operate at maximum rate as described
in Section 7.4.
5. Remove the plug from the flue sampling point (Fig. 35), insert
the analyser probe and obtain the CO/CO 2 ratio. This must be
less than 0.004. If the combustion reading (CO/CO 2 ratio) is
greater than this, and the integrity of the complete flue system
and combustion circuit seals has been verified, and the inlet gas
pressure and gas rate are satisfactory either:-
• Perform the 'Standard Inspection and Maintenance' (Section
10.2) & re-check.
• Perform 'Setting the Gas Valve' (Section 10.3.13) & re-check.
• Replace and set the gas valve (Sections 10.3.10 & 13) &
re-check.
7215845 - 01 (08/14)