Glow-worm Betacom C - Manual (Page 46)

46
12 Servicing
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 all cases the
boiler must be serviced at least once a year.
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.
6. On completion the “Benchmark” Service Record should be completed.
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.
14540
Diagram 12.1
CONDENSATE
OUTLET PIPE
C.H. ISOLATION
VALVE FLOW
C.H. ISOLATION
VALVE RETURN GAS ISOLATION
VALVE INLET
COLD WATER
ISOLATION VALVE INLET
D.H.W
OUTLET
SAFETY DISCHARGE
PIPE
ISOLATION VALVES SHOWN CLOSED
● Ensure that the gas analyser is set to the correct fuel
setting.
● Select the constant central heating with DHW function by
turning the function switch, refer to commissioning section.
The boiler should fire automatically.
NOTE: Safe combustion can only be verified by measuring
CO/CO2 ratio. This ratio must not exceed 0.0008.
Burner
Refer to Commissioning, section 11.5 “Setting operational
pressure”.
Check that the burner pressure at maximum and minimum
rate, is as the value in the boiler specification table on page 8.
If incorrect, adjust as necessary.