Bedienungsanleitung A.O. Smith EQ 155 (Seite 23 von 32) (Englisch)

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3. FOR THE USER

3.1 Commissioning

Warning

Installing and commissioning (for the

first time) of this water heater should

only be carried out by a qualified

competent heating engineer.

3.1.1 Filling the water heater

1. Close the drain tap.

2. Open the cold water tap to the water

heater and open all taps where hot

water can be drained for de-

aeration. The water heater is filled

as soon as cold water flows from all

taps.

3. Close all hot water drain taps.

3.1.2 Putting into operation

1. Check whether the device has been

filled with water and whether the

gas supply to the water heater is

open.

2. Turn the temperature control knob

clockwise and place the control knob

in the ‘PILOT’-position (✸).

3. Remove the outer and inner door of

the combustion chamber.

4. Keep the control button pushed-in

and press the piezo-ignitor several

times until the pilot burns (see Figure

6).

5. Keep the control button (✸) pushed-

in for approximately 20 seconds.

After releasing the button the pilot

should remain burning. If the pilot

extinguishes you should wait 5

minutes before repeating the ignition

procedure.

6. Subsequently remount the inner and

outer door; see “Mounting the inside

door”.

7. Turn the control button to the ‘ON’

(

) position.

8. Place the temperature control button

in the correct position, preferably

position 4 (approximately 60°C). The

appliance will now operate fully

automatically.

3.1.3 Use

The appliance is under water supply

pressure (with a maximum of 8 bar).

The amount of cold water that is added

is equal to the amount of hot water

used. The gas control block

automatically regulates the gas supply.

The main burner will ignite as soon as a

reduction in water temperature is

sensed by the control thermostat. The

main burner will shut down as soon as

the water temperature returns to the

preset temperature.

Position 1 = approximately 30°C

Position 2 = approximately 40°C

Position 3 = approximately 50°C

Position 4 = approximately 60°C

Position 5 = approximately 70°C

Higher water temperatures will cause

more scale build up in the appliance. It is

for this reason that it is recommended to

place the temperature control knob in

position 4 as the accumulation of scale

will be reduced at lower temperatures.

In addition a safety thermostat has been

fitted. This thermostat completely shuts

off the gas supply if the water

temperature reaches 82°C, also

extinguishing the pilot burner.

3.1.4 Putting out of operation

1. For short periods of time the control

knob should be turned to (✸); the

pilot keeps burning.

2. For longer periods of time the knob

should be turned to the (

●) position;

the pilot is extinguished.

3. Close the gas tap in the supply pipe.

In case of longer interruptions or in

the event of risk of frost it is

recommended to also close the cold

water tap and to drain the appliance

after cooling (open the drain tap; it is

possible to connect a drain hose to

the drain tap; open the nearest hot

water drain point to prevent

airlocks).

To be able to drain the appliance

completely it should be disconnected

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A.O. Smith EQ 155 Seite 23

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