Ariston AQUABRAVO ITSI 255 Anweisungen für Installation, Wartung und Gebrauch - Seite 24

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COMMISSIONING

The thermostat(s) on the immersion heater(s) should be adjusted to trip at

60-65°C. This is the ideal temperature to prolong element life in hard water

areas. Scale on the sheath builds up more rapidly at temperatures above

this causing the element to overheat and premature failure can occur. Higher

temperatures without additional controls would result in scalding. In known

hard water areas the use of a scale inhibitor is also recommended.

In addition to the thermostat the thermal cut-out will switch power off to the

element should the thermostat malfunction, causing an excessive rise in

water temperature. The thermal cut-out can be reset manually after the fault

has been corrected.

inDirect systeMs

For models up to 300 litres a mains supply of 240V, 3kW (13 amps) will be

required for the direct immersion heater. heat resistant cable, round 3 core

(to BS6141) must be used. For High Capacity 500 litre models

2.5mm

consult the wiring diagram on page 20 of this manual.

For indirect controls a 240V, 3 amp supply is required.

The cables must be clamped in position (as previously stated) and the

control thermostat should be set at 60°C for the reasons above. In addition

to the thermostat there is a thermal cut-out should the thermostat fail. Refer

to F

. 3.13.

wArninG : tHe AppliAnce Must Be eArtHeD.

The earth continuity conductor of the electrical installation must be

effectively connected to all exposed parts of other appliances and services

in the room in which the water heater is to be installed and conform to the

I.E.E. wiring regulations.

: Do not switch on the immersion heater or fire the boiler until the

ote

cylinder is full of water.

Check for obvious signs of damage to the cylinder and controls, and also

that the controls fitted correspond with the references quoted in these

instructions.

Ensure that the drain cock at the base of the appliance is closed before

commencing.

1) ProTech Models Only. Ensure that the ProTech anti-corrosion system is

connected to the electrical supply;

2) Ensure that the line strainer (situated in the pressure reducing valve) is

clear of installation debris and clean if necessary;

3) Check that the pressure in the expansion vessel is the same as the

incoming water pressure;

4) Open all outlet taps;

5) Turn on mains water supply and allow the water heater to fill;

6) Ensure that the hot water system is flushed in accordance with BS 6700;

7) Close taps in turn after having purged the system of air;

8) Check for leaks around the controls and immersion heaters and again

after the unit has heated up;

9) Check that no water is passing to waste through the relief valves;