Water Quality And Treatment - andrews OFS25 Installation Manual, Operation And Service Manual

SECTION 3
WATER
QUALITY AND
TREATMENT
12
INSTALLATION
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 erode 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
standard magnesium anodes. These anodes do not need maintenance or replacement.
The potentiostat which regulates the current to the Correx
light which shows green to indicate correct function and red to indicate malfunction.
An additional Correx TM BEMS version is available, which provides a remote
warning signal.
These anodes are available as an optional extra on all Andrews Water 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.
When installing Andrews Water Heaters in hard water areas we would recommend
that a water treatment specialist is consulted.
The following companies have supplied water treatment equipment in the UK for a
number of years to various establishments including those where Andrews water heaters
have been installed.
WATER TECHNOLOGY LTD
Powke Lane Ind. Estate
Blackheath
Birmingham
B65 0AH
Contact
Gareth Morris
Tel: 0121 561 3144
Fax: 0121 561 4184
TM UP powered anodes as an alternative to the
WATERMATIC
Reddicap Trading Estate
Sutton Coldfield
West Midlands
B75 7BY
Contact
Mike Potter
Tel: 08000 838496
Fax: 0121 311 1427
TM anode, features an indicator