Ariston ST 100 ProTech Manuale d'uso - Pagina 5

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3) Close taps in turn after having purged the system of air.

4) Check for leaks around the controls and Immersion Heaters and again after the unit has heated up.

5) Check that no water is passing to waste through the relief valves.

6) Test the operation of the Temperature & Pressure Relief and Expansion Valves by lifting/turning the manually operated

test lever/cap and observing that water flows through freely and safely to waste.

7) Check that the discharge pipe is plumbed so that it falls continuously and that no taps, valves or other shut off devices

are installed in the pipe.

8) Check that all thermostats are set at 60°C.

9) DIRECT UNITS. Switch on Immersion Heater(s) and allow unit to heat up. Check operation of Thermostat(s).

10) INDIRECT UNITS. Fill the indirect (primary) circuit following the boiler instructions. Switch on the boiler, ensure that the

programmer is to Domestic Hot Water. Allow unit to heat up and check operation of indirect thermostat on motorised

valve(s).

11) Demonstrate operation to user, including operation of Temperature & Pressure Relief Valve and what to do if it

operates.

12) Give this book to the user to retain for future reference and make the customer aware that periodic checks of the

equipment are essential for safety.

MAINTENANCE

No longer than every 12 months, the installer should check the Magnesium Anti-corrosion Anodes (consult the label on the

face of the unit for the correct location). Assessment of the condition of the bottom anode can be made by judging the

condition of the top anode.

If the heating element is heavily coated with scale we recommend descaling at the time of this inspection. The Expansion

Vessel may need to be recharged periodically by your installer.

WARNING : SWITCH OFF THE POWER SUPPLY BEFORE WORKING ON THE APPLIANCE.

If the Thermal Cut-Out has operated the cause must be found before resetting.

Removal of top & bottom Anodes;

1) Close the mains supply service valve.

2) Open hot water taps.

3) Attach a hose and open the drain cock and allow the cylinder to empty.

4) The anodes are removed by unscrewed using an Allen key.

EXAMINE THE ANODES AND REPLACE IF THE DIAMETER IS LESS THAN 10mm.

The use of P.T.F.E. sealing tape is recommended to ensure watertight connection for Anodes.

Descale the Immersion Heater(s) and remove any lime deposit from the cylinder. Replace in reverse order. THIS DOES

NOT APPLY TO COMFORT MODELS.

Check controls as per the following:-

1) Check and clean the Line Strainer before refilling the system.

2) Check pressure in Expansion Vessel and top up as necessary.

3) Check manually by lifting the test lever, the Temperature & Pressure Relief Valve.

4) Check manually by turning the test knob the Expansion Relief Valve.

5) Check discharge pipes from both Temperature & Pressure Relief and Expansion Relief Valve for obstructions.

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FAULT FINDING

FAULT

POSSIBLE CAUSES

1) Mains Cold Water

supply shut off

NO HOT WATER

2) Line Strainer

FLOW

blocked

3) Cold Water

Combination valve

fitted incorrectly

1) Low Mains Water

Pressure

REDUCED FLOW

2) Line Strainer

RATE

partially blocked

3) Size of Service

Pipe too small

1) Direct Immersion

Heater is not

switched on

2) Direct Thermal

Cut-Out has

operated

WATER FROM

3) Boiler Programmer

HOT TAPS

set to Central

IS COLD

Heating only

(Indirect models)

4) Boiler is not

functioning

(Indirect models)

5) Indirect Thermal

Cut-Out has

operated

6) Motorised valve

jammed or not

wired correctly

(Indirect models)

DISCHARGE FROM

1) Pressure above 7

PRESSURE/

bar, failure of

TEMPERATURE

Pressure Reducing

RELIEF VALVE

Valve. Temperature

above 90 C failure

of thermal control

DISCHARGE FROM

1) Continually.

EXPANSION

Pressure Reducing

VALVE

Valve faulty

When heater is heating

Faulty Expansion

Vessel or lost charge

REMEDY

Check and open Isolating

and/or Stop Valve. Check

water, Local Water Authority

Turn off mains water supply,

remove Line Strainer and

clean

Check direction of flow

arrows on valve, refit in

correct position if necessary

Check pressure, consult

Local Water Authority if

necessary

Turn off mains water supply,

remove Line Strainer and

clean

Increase to size stated on

page 4

Check Immersion Heater,

switch on if necessary

Test Thermostat operation

and wiring, if faulty,

correct/replace. Reset Cut-Out

Check switch on Domestic

Hot Water if necessary

Check boiler operation, if

fault suspected consult

Manufacturer's Instructions

Test Thermostat operation

and wiring, if faulty,

correct/replace. Reset

Cut-Out

Check wiring and operation of

Motorised Valve correct/

replace as necessary

Shut down boiler or immersion

heater. Check pressure

Reducing Valve and Thermal

Controls. Replace if

necessary

Check pressure from valve.

Replace if over 3.5 bar

Check charge of vessel. Re-

charge vessel to 3.5 bar or

replace if necessary

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