Manual Ariston ACO35 MFFI COMBI (page 6 of 12) (English)

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Adjusting the heating

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

by adjusting the knob “C”. By positioning the indicator some-

where 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 dis-

play

External (room) thermostat control

If an external (room) thermostat is installed, it is recommended

that the temperature of the Central Heating system be set by

means of the knob

“C”, leaving it at max in order to obtain the

best performance from the boiler and to allow the regulation of the

room temperature to function efficiently.

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

“E”. A deliv-

ery 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

“E” to max. and reduce

the water flow rate at the tap.

The water temperature in the primary circuit is shown on the

display.

Start-up Procedure

Before starting the boiler, check the following:

The water pressure on the pressure gauge

“

F”

s between 1 and 1.5

bar;

- That the external gas cock

“M” and “N” and the inlet for domestic

water are open.

These models are equipped with electronic ignition (there is no pilot

light).

To switch the boiler on, push the button. Turn the knob

“C” to

the summer

“ ” or winter position; a centralised electronic con-

trol unit will automatically light the main burner when needed without

any intervention from the outside (green LED “A” will illuminate when

the burner is on).

If the burner does not light within the pre-set safety time limit, the dis-

lay will show an error code and the red LED “H” will illuminate.

To reset the ignition system, the reset button must be pressed.

Should the system fail to light a second time, check to make sure that

the gas cock is open. If the problem persists, contact one of our

Authorised Service Centres.

Winter and Summer Operating Modes

In the “winter” operating mode, the boiler will produce both

Central Heating and Domestic Hot Water. In the “

summer” oper-

ating 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

“C” at the “ ”

position selects the “summer” operating mode. “Winter” operating

mode may be selected by positioning the knob

“C” between the

min. and max. settings.

summer

winter

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Ariston ACO35 MFFI COMBI Manual

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