Ariston 500 STD ProTech Instructions For Installation, Servicing & Operation - Page 24

Browse online or download pdf Instructions For Installation, Servicing & Operation for Water Heater Ariston 500 STD ProTech. Ariston 500 STD ProTech 34 pages. Unvented hot water storage cylinders

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4.
COMMISSIONING
The thermostat{s) on the immersion heater(s) should be adjusted to trip at
eo-es^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
2.5mm2 (to BS6141) must be used. For High Capacity 500 litre models
consult the wiring diagram on the reverse of the inspection panel.
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 Fig. 3.14.
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.
Note: Do not switch on the immersion heater or fire the boiler until the
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 allovy 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;