Storage And Delivery Temperatures; Water Quality - Rinnai HJ COOPER LC Series Owner And Installer Manual

Storage and delivery temperatures

Storage temperature
To meet the New Zealand Building Code requirement
cylinder thermostat has been set to 65 °C.
Thermostat settings must only be adjusted by an electrician or other suitably qualified
tradesperson. The access cover to the element and thermostat must only be removed
WARNING
by an electrician or other suitably qualified tradesperson.
Sanitary fixtures delivery temperature
Water temperatures over 55 °C can cause severe scalds. Local regulations must be considered
regarding temperature limitations of hot water supplied to areas used primarily for personal
hygiene. The temperature is limited to 45 °C for early childhood centres, schools, nursing
homes or similar facilities and 55 °C for all other buildings. To comply with these requirements, a
temperature limiting device, such as a tempering or thermostatic mixing valve will be required
on all installations.
1 Clause G12.3.9, Acceptable Solution G12/AS1 6.14.3

Water quality

The water quality of most public supplies, and from bore wells is
generally suitable. Refer to the water quality parameters in the warranty
section of this guide for further information.
Blue water
Blue water is a result of biofilms being formed which corrode the copper to feed the
microorganisms, producing copper carbonate and hydroxyis in the water. The major cause is
the lack of chlorine in the water to destroy the microorganisms, but it is also effected by the pH
value. In instances of blue water, it is recommended that expert advice on chlorine control is
consulted, and the pH of the water is tested. The recommended pH scale is between 8.0-8.3.
Pitting corrosion
Pitting corrosion occurs when the protective coating does not form on the interior of the hot
water tank. The main cause of this is the failure to hold the pH at 8.0-8.3 for the period of four
months immediately following the tank installation. Pitting corrosion may also occur, in the form
of deposit attack, if foreign or corrosion products have been allowed to enter the water supply.
In the instances of deposit attack it is recommended filtration experts are consulted.
12 | Low pressure indoor copper cylinders: Owner and installer guide: 20733-D 04-18
1 to disinfect water for legionella bacteria, the