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2.8 maintenance
To ensure safe and efficient operation of
the water heater it is recommended that
it is cleaned and serviced at least once a
year by a qualified competent person.
2.8.1 Sacrificial anode
The life cycle of the anode is determined
by the quality and the quantity of the
water flowing through the apparatus. It is
therefore recommended that the anode
be inspected and replaced if necessary
at least once a year.
1. Close the stop cock in the cold water
supply pipe;
2. Open the nearest hot water tap in
order to allow the pressure to drop
from the water heater and the pipes;
3. Slacken the anode with a fitting
wrench;
4. Check the anode and replace it if it
has been reduced in diameter by 60%
or more at any point on its length;
5. Check for water leaks.
If it is necessary to replace the anode it
should always be replaced by one of the
same type.
Figure 10 - Conversion to another gas
The type of anode required can be
determined on the basis of the type of
the appliance and the serial number.
2.8.2 Cleaning
1. Close the gas supply and demount
the burner after it has cooled down;
2. Disconnect the burner, pilot pipe and
thermo couple from the gas control
block (see drawing 11);
3. Remove the complete burner
assembly;
4. Clean the burner with a soft brush;
5. Check the pilot burner and clean it if
so required;
6. Check the combustion chamber, flue
tube and flue baffle and clean these
if required;
7. Re-mount in reverse order. Tighten
the thermo couple connection on
the gas control block hand tight and
tighten it further with a wrench to a
maximum of 1/4 turn as it only needs
to make contact;
After cleaning of the pilot- and main
burner the operation of these should be
checked. If necessary the burner pressure
of the main burner should be reset.
AOS 0487
