Unvented Controls; Thermostats - Ariston ST 100 ProTech Instructions For Installation, Servicing And Use

Unvented hot water storage cylinders

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unvented controls(s)

Check controls as per the following:

1) Line strainer - with the water supply turned off remove screen from

strainer and clean of any detritus;

2) Expansion vessel - with the water supply turned off and taps open, check

expansion vessel pressure and top up as necessary;

3) Temperature & pressure relief valve - with the water supply turned on,

check manually by lifting the test lever/turning the test knob (ensure valve

closes after testing);

4) Expansion relief valve - check manually by turning the test knob (ensure

valve closes after testing);

5) Discharge pipes (D1) - from both temperature & pressure relief and

expansion relief valve for obstructions;

6) Tundish & discharge pipe (D2) - open either valve gradually to produce a

full bore discharge into tundish and D2 without any back pressure;

7) Pressure reducing valve - check that the correct outlet pressure is being

maintained by recording the pressure at an in-line terminal fitting i.e. tap.

Ensure that all thermostats adjusted for the correct temperature setting, this

should be between 60 and 65°C.

After servicing, complete all relevant sections of the Benchmark Checklist

located on page 35 of this manual.

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