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17.7
SACRIFICIAL ANODES: INSPECTION AND REPLACEMENT
If the Correx non-sacrificial anode protection system is used, there is no requirement to check the condition of the anodes.
The tank is protected against corrosion by means of two sacrificial anodes fitted in the front of the storage vessel. The rate at which the anodes
are eroded is dependent on the quality of the water; therefore it is essential that the anodes are inspected at least once a year.
1.
Drain the water heater. Refer to Section 17.5: DRAINING THE WATER HEATER SYSTEM.
2.
Remove the outer caps covering the anodes.
3.
Remove each anode and inspect its condition. If the anode has reduced in size by more than 40% or if the surface is severely pitted,
the anode should be replaced. Particular attention should be paid to the ends of each anode to ensure excessive localised depletion
has not occurred.
4.
When refitting the inspected or replaced anode, a suitable jointing compound should be applied to the threads of the anode to prevent
water leakage.
17.8
REFILLING THE SYSTEM
1.
Close the drain valve.
2.
Open a hot water fixture to allow air to escape.
3.
Open the cold water supply to water heater and allow the tank to fill.
4.
Follow the lighting instructions as detailed in Section 15.4.3: PROCEDURE FOR INITIAL LIGHTING.
5.
Check for water leakage.
17.9
OTHER CHECKS
AIR PRESSURE SWITCH LINES
During the annual service, check the lines to/from the air pressure switch to ensure:
1.
They are correctly fitted
2.
There is no damage
Anode Rods
Check all connections
59
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