Inspection And Maintenance; Inspection And Maintenance Considerations; Resources For Inspection And Maintenance; Inspection And Maintenance Steps - Worcester Greenstar 8000 Life Installation And Maintenance Instructions Manual

Inspection and maintenance

8 Inspection and maintenance
DANGER
Risk of electric shock!
▶ Isolate electrical components from the power supply (230 V AC)
(fuse, circuit breaker) and secure against unintentional re-
connection before carrying out any work.
Information on safe isolation can be found in the Health and Safety
Executive guidance HSG85.
▶ Check for zero potential before proceeding with work, using test
equipment approved to GS38 to confirm that the electricity supply is
disconnected.
CAUTION
Mains supplies:
▶ Safely isolate both the gas and electrical supply before starting any
work on the appliance and observe all relevant safety precautions.
NOTICE
Personnel and equipment
▶ Any service work must carried out by competent registered
engineers.
▶ Service work must not be attempted if a calibrated CO/CO
and manometer are not available.
WARNING
Hot surfaces!
If the appliance has been operating components may be hot.
▶ Ensure precautions are taken when working on the appliance.
CAUTION
Annual maintenance checks:
Annual maintenance checks have to be conducted to ensure the
continued safe and reliable operation of the boiler.
▶ During each maintenance check, the gas valve, all gas joints and test
points should be checked for leakage using an analyser/sniffer.
▶ If a leak is found on the gas valve then it needs replacing as a gas valve
is a non-repairable component.
CAUTION
Component replacement:
▶ After replacement of a gas related component, where a gasket or seal
has been disturbed or replaced, check for gas tightness using a gas
sniffer/analyser.
▶ Also after re-assembly, carry out the following checks:
 Fan pressure.
 Flue gas analysis.
60
8.1

Inspection and maintenance considerations

• To ensure continued efficient operation the appliance must be
checked at regular interval.
• The frequency of servicing will depend upon the particular
installation conditions and usage, however, normally an annual
service is recommended.
• The extent of the service work required by the appliance is
determined by the operating condition of the appliance when tested
by qualified engineers.
• After each service, the service interval record sheet at the rear of this
manual, must be completed.
See the following instructions for detail of some of the service
requirements:
▶ Check that the safety and regulation appliances (3 bar pressure
release valve, air bleed, etc.) are operating properly.
▶ Check all joints and connections in the system and remake any that
show signs of leakage. Refill and re-pressurise if applicable as
described in the commissioning section.
▶ When it is frequently necessary to add water to maintain pressure in
the installation, even though no leaks have been discovered, perform
an expansion vessel check.
▶ Check that the condensate system is not obstructed, clean and refill
the condensate siphon.
▶ If the appliance is in a compartment or cupboard check that the
specified clearances around the appliance is clear.
analyser
▶ Check that the flue system is unobstructed and undamaged, clean/
2
replace as necessary.
– If fitted ensure the flue terminal guard is also unobstructed and
undamaged.
▶ Operate the appliance and take note of any irregularities.
– Refer to the fault finding pages for rectification procedure.
8.2

Resources for inspection and maintenance

• The following measuring devices are required:
– Electronic flue gas analyser for CO
temperature
– Pressure gauge 0 - 30 mbar (minimum resolution 0.1 mbar)
▶ Use heat conducting paste 8 719 918 658 0.
▶ Use approved greases.
8.3

Inspection and maintenance steps

 chapter 12.9
Maximum system pressure
▶ 2.5 bar must not be exceeded when the heating system water is at
maximum temperature. If this pressure is exceeded then an
additional expansion vessel must be fitted into the system return as
close as possible to the appliance.
▶ If the system does not retain the pressure, the pressure relief valve
(PRV) and the heating system should be checked for leaks.
, O , CO and flue gas
2 2
Greenstar 8000 Life – 6720883865 (2021/11)