Water Quality And Treatment; Water Connections - andrews RFF190 Installation Manual, Operation And Service Manual

INSTALLATION

WATER QUALITY AND TREATMENT

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
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.
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.
When installing Andrews Water Heaters in hard water areas we would recommend
that a water treatment specialist is consulted.
How the system works
The heater is fitted with the Hydrojet Total Performance System incorporated in the cold
inlet dip tube. The tube is designed to increase turbulence and reduce sediment build up,
reduce thermal stacking and increase delivery.
TM UP powered anodes as an alternative to the
TM
The upper "jet ports"
direct the flow outward
to begin the dynamic
mixing action.
The lower "jet ports"
direct the flow
inward to increase
the turbulence.
anode, features an indicator
SECTION 3
WATER
CONNECTIONS -
GENERAL
HYDROJET
SYSTEM
9