Water Quality And Treatment - andrews RSC 9/145 Service Manual

3.7

Water Quality and Treatment

Issue 4 21042018
Where extreme conditions of water hardness exist, scale can
form in any water heating equipment, especially when the heater
is working under conditions of constant heavy demand and at
high temperatures.
Each water heater is fitted with one or more magnesium
anode(s) which protect the tank from corrosion caused by
electrolytic action. Magnesium anodes are sacrificial in that they
corrode as they protect. When the anode has eroded to less
than 50% of it's original diameter, it may not offer protection.The
anodes should be inspected annually and replaced as
necessary. Frequency of anode replacement will vary dependent
on water quality.
Andrews Water Heaters offer Correx
an alternative to the standard magnesium anodes. These
anodes do not need maintenance or replacement. The
potentiostat which regulates the current to the Correx
features an indicator light which shows green to indicate correct
function and red to indicate malfunction. These anodes are
available as an optional extra on all Andrews heaters.
In hard water areas, scale formation can occur in hot water
systems and hot water heaters and the higher the temperature
and volume of water used, the more problematic the scale build-
up can be. Water treatment is normally recommended when the
hardness reaches 100 - 150ppm (7 - 10 degrees Clark) and
above. This problem can be minimised by reducing the water
temperature in the heater and by fitting suitable water pre-
treatment equipment.
Note
When installing Andrews Water Heaters in hard water
areas we would recommend that a water treatment
specialist is consulted.
UP powered anodes as
TM
anode,
TM
15