Water Quality And Treatment - andrews ECOflo Series Installation And Service Manual

3 Installation

3.30 Water quality and treatment

Fig. 16
38
Tank Heater casing
Note
Natural inlet with mechanical extraction must not be used.
Where a mechanical inlet and mechanical extraction system is
used, the design extraction rate must not exceed one third of the
design inlet rate.
All mechanical ventilation systems must be fitted with automatic
gas shut off safety systems which cut off the supply of gas to the
heater(s) in the event of failure of either the inlet or extract fans.
The requirements for air supply by mechanical ventilation are
given in BS6644 Clause 19.3. and in IGE/UP/10 Pt.1.
The permanent air vents shall be sited away from the extractor
fans. It may be necessary to increase the ventilation area to
compensate for the extractor fan.
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.
In hard water areas, scale formation can occur in hot water
systems and hot water heaters. 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.
Each Andrews ECOflo Water Heater includes two factory fitted
Correx™ Powered Anodes as standard. These anodes do not
need maintenance or replacement. The potentiostat which
regulates the current to the Correx™ anode features an indicator
light which shows green to indicate the correct function and red
to indicate a malfunction. The anodes and potentiostat are
available as spare parts if required, (see page 52 for part
numbers).
The ECOflo water heater is fitted with the Hydrojet Total
Performance System incorporated in the cold inlet nipple. The
system is designed to increase turbulence and reduce sediment
build-up, reduce thermal stacking and increase delivery.
All models now incorporate the new Hydrojet system on cold
inlet side connections.This system ensures water is directed
onto the tank base which minimises sediment build-up from day
one of installation.
Issue 2 14/07/16