Water Supplies - Rheem 300 series Installation Instructions Manual

WATER SUPPLIES

Your water heater is manufactured to suit the water conditions of most
Australian metropolitan supplies. However, there are some known water
supplies which can have detrimental effects on the water heater and its
operation and/or life expectancy. If you are unsure of your water quality, you
can obtain information from your local water supply authority.
ANODE
In areas where the total dissolved solids (TDS) exceeds 600 mg/L it is possible
the black anode, which is the standard anode fitted to the water heater, may be
excessively active. To alleviate this, the black anode should be replaced with
one colour coded blue. Where the TDS of the water is less than 40 mg/L, such
as when the water has been deionised or is from an alpine supply, a high
potential anode, colour coded green, should be used. The changing of anodes
must be carried out by a plumber or authorised service person.
CAUTION
If your water supply has a TDS greater than 600 mg/L and the anode has not
been changed to a blue one, there is the possibility hydrogen gas could
accumulate in the top of the water heater during long periods of no use.
If, under these conditions, the water heater has not been used for two or more
weeks the following procedure should be carried out before using any electrical
appliances (automatic washing machines and dishwashers) which are
connected to the hot water supply.
The hydrogen, which is highly flammable, should be vented safely by opening a
hot tap and allowing the water to flow. There should be no smoking or naked
flame near the tap whilst it is turned on. Any hydrogen gas will be dissipated.
This is indicated by an unusual spurting of the water from the tap. Once the
water runs freely again, any hydrogen in the system will have been released. In
areas where this is likely to occur, the householder should be instructed by the
installer on how to dissipate the gas safely.
SATURATION INDEX
The saturation index is used as a measure of the water's corrosive or scaling
properties. In a corrosive water supply, the water can attack copper parts and
cause them to fail. In a scaling water supply calcium carbonate is deposited out
of the water onto any hot metallic surface. Where the saturation index exceeds
+0.40, the water is scaling and an expansion control valve* must be fitted on
the cold water line after the non-return valve.
* Refer to the cold water connection detail on page 20.
WATER HEATERS NOT INSTALLED IN ACCORDANCE WITH THE ABOVE
ADVICE WILL NOT BE COVERED BY THE WARRANTY.
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