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18
• CLEANING THE HEAT EXCHANGER
To carry out the annual cleaning of the heating body, proceed as follows:
- Turn off the gas supply
- Turn off the supply of water to the appliance by turning off the appliance’s
water inlet tap.
- Turn on all the hot water taps to empty all the pipes.
- Remove the heating body and clean it by gently brushing the fins. Soot if found
should be removed by washing, and the cause of the sooting investigated.
• CLEANING THE PILOT
If the pilot light flame is yellow and the safety valve takes a long time to open, this
means that either the pilot injector or pilot burner is partially blocked.
The pilot injector may be blocked with contaminants carried within the gas, whilst
the pilot burner is more likely to be contaminated by insects (spiders / egg sacs)
N.B. No attempt should be made to clear blocked or partially blocked pilot
injectors by using wire. If blowing through the injector fails to clear the
restriction, then a new injector should be fitted.
When the pilot is working normally the flame should be a stable blue coloured cone
shape. To clean the pilot burner, proceed as follows:
- Turn off the gas supply, remove the front cover. Remove the pilot injector, by
slackening the supply pipe nut first, and unscrewing the pilot injector from the
pilot burner
- Remove the contamination from within the pilot burner using wire, and blow
through to remove any further debris.
- Replace the pilot injector, ensuring that the washers are properly fitted and test
joints with leak detection fluid.
A.2.4. SYMBOLS
The meanings of the symbols used on the appliance and on the packaging are as follows:
Cat : Appliance category
Qn : Nominal gas flow rate according to Hi
Qm : Minimum gas flow rate according to Hi
Hi : Net calorific value
A.2.5 TROUBLE SHOOTING
Majority of the problems you will come across are usually caused by either gas supply,
water supply, air supply or contamination of either!
Always carry out basic performance tests including operating pressure
tests before jumping to the troubleshooting chart.
Be sure you are getting an accurate description of the symptoms before
concluding the water heater is at fault. The charts assume a level of knowledge and
competency and are there to serve as a guide and a prompt.
18


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