Ariston EP 30 R 3 KW Manual - Halaman 13

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i) for under-sink models (EP 10 UR - EP 15 UR) disconnect pipes and

removed the heater from the wall.

ii) for over-sink models (EP 10 OR - EP 15 OR - EP 30 R 3KW) undo the

cold water supply pipe and open a hot water tap.

The heating element may be removed (after taking out the thermostat

phials on model EP 30 R 3KW) by undoing the M6 nut.

The assembly should then be turned through 90° anti-clockwise to ease

removal from the water container.

Once the element is free from the water container the anode may then

be inspected and removed if necessary.

When reassembling the cover make sure that the regulation knob is

coupled with the thermostat.

Check controls (where fitted) as per the following:

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

strainer and clean of any detritus;

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

expansion vessel pressure and top up as necessary;

- 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);

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

valve closes after testing);

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

expansion relief valve for obstructions;

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

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

- 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.

1)Pressure and temperature valve dripping/running all the time.

Cause: Thermal cut-out and thermostat have failed (this is only the

case if the water being discharged is near to boiling).

Mains pressure is above 7 bar. A pressure reducing valve must

be fitted (see page 4, Fig..1).

2)Pressure relief valve dripping/running all the time.

Cause: Mains pressure is above 6 bar. A pressure reducing valve must

be fitted (see page 5, Fig. 2).