Справочник Пользователя для Rheem GAS DOMESTIC OUTDOOR WATER HEATER

 

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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. 
 

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. 
 

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. 
 

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 is greater than 
+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 

22.