Ariston CLAS B 25 CF User Manual - Page 4

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manuale d'uso

Initial operating procedures

If the boiler is installed inside the apartment, make sure that

all provisions relating to the air inlet and room ventilation (in

compliance with current legislation) are respected.

Check the water pressure on the display regularly and make sure

that the figure is between 0.6 and1.5 bar when the system is cold.

If the pressure is just under the minimum restablish the correct

pressure by open the valve under the boiler.

If the pressure drops very frequently, there may be a water leak at

some point in the system. If this is the case a plumber should be

contacted.

Ignition procedure

Press the ON/OFF button on the control panel to switch on the

boiler. The display shows:

The first figure indicates the operating mode:

0 XX

- Stand -by,

C XX - Central heating request

c XX - Heating post-circulation

d XX - Domestic hot water request

b XX - Storage

H XX - Hot water post-circulation

F XX - Circulation pump anti-freeze protection enabled

- burner anti-freeze protection enabled

The second and third figures indicate:

- the flow temperature when no heating requests have been

made

- the flow temperature in central heating mode

- the temperature of the hot water in domestic hot water mode

the flow temperature in anti-freeze mode. ta.

Winter and Summer Operating Modes

In the "winter" operating mode, the boiler will produce both Central

Heating and Domestic Hot Water. In the "summer" operating mode,

the boiler will produce only Domestic Hot Water.

Using the knob on the control panel, the user can select "winter" or

"summer" operating mode. Keeping the knob "5" at the " " position

selects the "summer" operating mode. "Winter" operating mode

may be selected by positioning the knob "5" between the min. and

max. settings.

Adjusting the heating

It is possible to set the temperature of the Central Heating system

by adjusting the knob "5". By positioning the indicator somewhere

between 1 and 6, a temperature may be obtained which varies

from approximately 38˚C to about 82˚C.

The water temperature in the primary circuit is shown on the

display.

Setting the hot water for domestic use

Both in the winter and summer mode, the temperature of the

Domestic Hot Water may be adjusted by using knob "10". A

delivery temperature for the water may be chosen in a range from

36˚C to about 56˚C, depending on the flow rate of the water and

the position of the knob between the min. and max. settings.

To increase water temperature, turn knob "10" to max. and reduce

the water flow rate at the tap.

The domestic hot water temperature is shown on the display.

To exclude the storage, press the button 17, the Yellow LED 4 lights.

The boiler will still provide only heating.