Routine Servicing - Alpha InTec2 20SE Installation And Servicing Instruction

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ROUTINE SERVICING

To ensure efficient operation of the boiler it is recommended that it is checked and serviced as necessary at regular intervals.
The frequency of servicing will depend upon the particular installation conditions and usage, but in general once per year is
required as a minimum.
It is the law that any service work must be carried out by a competent person, i.e. Gas Safe registered engineer.
Warning: Before servicing the boiler, isolate the electrical supply and close the boiler gas service cock. Allow the boiler to cool.
Always test for gas tightness after servicing any gas carrying components.
Always carry out electrical system checks i.e. Earth Continuity, Resistance to Earth, Short Circuit and Polarity with a suitable
meter before and after servicing.
General
Please Note: During routine servicing, and after any maintenance or change of part of the combustion circuit, the following
must be checked:
1. The integrity of the flue system and the flue seals, as described in Section 4.6 and 4.7.
2. The integrity of the boiler combustion circuit and relevant seals.
3. The operational (working) gas inlet pressure at maximum rate, as described in Section 5.7.
4. The combustion performance, as described below and in Section 5.7.
5. The air flow through the heat exchanger as described in Section 5.4.
Competence to carry out the check of combustion performance
Please Note: BS 6798:2009 Specification for installation and maintenance of gas-fired boilers of rated input not exceeding
70 kW net advises that:
1. The person carrying out a combustion measurement should have been assessed as competent in the use of a
flue analyser and the interpretation of the results.
2. The flue gas analyser used should be one meeting the requirements of BS 7927 or BS-EN 50379-3 and be
calibrated in accordance with the analyser manufacturers' requirements.
3. Competence can be demonstrated by satisfactory completion of the CPA1ACS assessment, which covers the use
of electronic portable combustion gas analysers in accordance with BS 7967, Parts 1 to 4.
Combustion check
Connect the flue gas analyser to the flue gas sampling point as shown in Fig. 5.3.
Notes: 1. Prior to servicing, it is recommended that a flue gas analyser is used to measure the performance of the boiler
(refer to Fig. 5.3 for the position of the flue sampling point). Refer to Section 5.7 Checking combustion. If the CO/
ratio measured is greater than 0.003 or when other checks or comments from the customer have indicated
CO
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that there may be problems, check the following:
Any flue gas recirculation in the flue system or boiler casing.
Any restrictions or blockages in the flue system.
The gas supply pressure and gas rate are correct.
If these are correct then cleaning of the burner and checking the electrode will be necessary. All Sections 6.1,
6.2, 6.3 and 6.4 must be carried out. After reassembling the boiler carry out a full calibration procedure (refer to
Section 5.13). Repeat the flue gas analyser test and check that the CO/CO
If the CO/CO ratio reading is still above 0.003, check again for flue gas recirculation, flue restrictions or blockage
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and insufficient gas supply pressure. If correct, repeat the procedure above (including full calibration) until you
obtain a ratio reading of below 0.003.
If the combustion reading is greater than the acceptable value AND the integrity of the complete flue
system and combustion circuit seals have been verified and the inlet gas pressure (and gas rate) have
been verified. Please call our Technical Helpline.
2. If the CO/CO ratio measured is less than 0.003 and other checks and comments from the customer suggest
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there are no problems then only Section 6.1 and Section 6.3 paragraphs 1, 2 and 3 need to be carried out to
allow a visual check of the components within the room sealed chamber.
6.1 IMPORTANT NOTES PRIOR TO SERVICING
1. Check the entire flue length and joints including the flue terminal outside. Ensure that all of the flue assembly has been
installed correctly and there are no blockages.
2. Run the boiler and check the operation of its controls.
3. Ensure that all system connections and fittings are sound. Remake any joints and check the tightness of any fittings that
may be leaking.
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Alpha InTec² 20SE and 30SE - Routine Servicing
ratio is less than 0.003.
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