Glow-worm Flexicom sx - Manual (Page 28)

0020107231_04 - 12/14 - Glow-worm
MAINTENANCE
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IMPORTANT NOTES:
1. To ensure the continued efficient and safe operation of the boiler it is recommended that it is checked and
serviced at regular intervals. The frequency of servicing will depend upon the particular installation and usage,
but in general once a year should be enough.
2. It is the Law that any servicing is carried out by a competent person approved at the time by the Health and
Safety Executive.
3. Before commencing with a service or replacement of parts the boiler should be isolated from the electrical
supply and the gas supply should be turned off at the gas service isolation valve.
4. When replacing a part on this appliance, use only spare parts that you can be assured conform to the safety
and performance specification that we require. Do not use reconditioned or copy parts that have not been
clearly authorised by Glow-worm.
5. If any electrical connections have been disconnected and after their connection, checks to the earth continuity,
polarity, short circuit and resistance to earth must be repeated using a suitable multimeter, as described in
section 13.
6. After servicing, complete the relevant Service Interval Record section of the Benchmark Checklist located in the
inside back pages of this document.
12 Servicing
General Inspection
Prior to, during servicing and after any maintenance or changed
parts, the following must be checked.
● The integrity of the flue system and flue seals.
● The integrity of the appliance combustion circuit and relevant
seals.
● Electrical, gas and water connections.
● System pressure.
● the combustion performance, refer to the following procedure.
● The operational gas inlet pressure and gas rates, refer to the
commissioning section paragraph 11.5.
Correct any fault before continuing.
COMPETENCY TO CARRY OUT THE CHECK OF
COMBUSTION PERFORMANCE
NOTE: BS 6798: 2009 Specification for installation and
maintenance of gas-fired boilers of rated input not exceeding
70kW net advises that:
● The person carrying out a combustion measurement must be
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.
● Ensure that the gas analyser is set to the correct fuel setting.
● Select the “
°C
bar
”, constant central heating function by pressing
the “Mode” button repeatedly, refer to
commissioning section. The boiler should fire automatically.
NOTE: Safe combustion can only be verified by measuring CO/
CO2 ratio. This must not exceed the value shown in the table
opposite.
13948
Diagram 12.1
13028
COMBUSTION CHECK AND SETTING THE AIR/
GAS RATIO VALVE
● Remove the front casing panel, see diagram 12.2 and hinge
down the control box. Taking care not to touch any internal
components, proceed as follows:
● Connect the CO2 combustion analyser to the relevant test
point, see diagram 12.1.