7 / EN
USER INSTRUCTIONS
PLEASE KEEP THIS BOOKLET FOR FUTURE REFERENCE
The heater is insulated to a high standard therefore it may be left on all the time. The tempera-
ture of the water may be adjusted by turning the knob on the front of the heater, allow half an
hour for the temperature to stabilise between settings. Maximum temperature is achieved with
the knob turned fully clockwise. The <<E>> mark on the regulation knob indicates an <<eco-
nomy>> setting and corresponds to a water temperature of 55 - 60°C. In hard water areas
we recommended a max. 60°C. The neon light shows when the heating element is working,
under control of the thermostat. If in doubt ring Ariston Thermo UK Ltd. Technical department
03332407777 Customer service department 03332408777.
Note: The water heater does not have an “o” or “low” setting.
WATER REGULATIONS AND BYELAWS
These regulations and byelaws ensure a good supply of wholesome water, and that only ap-
proved materials, pipes and fittings are used to convey water.
BUILDING REGULATIONS
These are a statutory document and take priority over all other regulations and recommen-
dations. The installation of an unvented hot water system of over 15 litres is classified as a
“Controlled Service” and Regulation G3 applies. To meet the requirements of the regulation,
installation of an unvented system should be undertaken by a “competent installer”.
All installations of unvented hot water storage systems having a capacity of more than 15 litres
should be notified to the relevant Local Authority by means of building notice or by the sub-
mission of full plans. It is important to note that it is a criminal oence to install an unvented hot
water storage system over 15 litres without notifying the Local Authority.
Delivery
The models are supplied with the following:
Unvented water heater (with factory-fitted T&P model 30L) x1
Wall bracket x1
Pressure relief valve set at 6 bar x1
Dielectric junctions x2
Tundish (model 30L only) x1
Expansion Vessel (model 30L only) x1
Check Valve (model 30L only) x1
Pressure reducing Valve (model 30L only) x1
Important note: Dielectric junctions must be fitted to all models as they prevent an
electrolytic reaction andsafeguard against potential aggressive corrosion.
HOW THE HEATER WORKS
The heating element is controlled by a thermostat which senses the water temperature.
The operating temperature can be adjusted by the regulation knob on the front of the heater.
In addition to the thermostat there is a thermal cut-out which is set to switch o the power to
the element if the thermostat fails and the water temperature rises too high. Once the cut-out
operates it can only be reset manually (this should be carried out by the installer - see main-
tenance).
A magnesium anode is provided to prevent corrosion of the water container.
The 30L model has a temperature and pressure relief valve on top of the heater which is a
safety device to back-up the thermostat and thermal cut-out. It works by sensing an excess
water temperature or pressure and releasing the hot water to the discharge tundish and drain.
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