Ariston ACO 32 RFFI Istruzioni per l'installazione e la manutenzione - Pagina 32

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. 3.22

. 3.23

WARNING

(*) - If curve 0_3 or 0_5 is set, a system

safety thermostat must be connected to

the main terminal board (see paragraph

2.10)

With parameter P 5 it is posslbe to adjust the heat curve

setting to those shown in fig. 4.16). Using programming keys

and

, the curve setting may be changed. The possibility of

setting curves varies according to parameter r:

r = 00 (low temperature range) from curve 0_3 to 0_5 (underfloor

systems only)

r = 01 (high temperature range) from curve 1_0 to 3_0.

max power Central Heating

max power DHW

minimum power

ETTING THE

(Only enabled when an outdoor sensor is installed)

When using an outdoor sensor, the microprocessor-controlled P.C.B.

calculates the most suitable flow temperature, taking into account

the exter nal temperature and the type of system. The

microprocessor is capable of doing this because it is possible to

establish a link between the external temperature and the flow

temperature of the Central Heating system water. This link translates

into a "thermal curve".

The type of curve should be chosen in correspondence with the

planned temperature of the system and the nature of the heat loss

present in the building.

100

20 16

Test Function

The P.C.B. allows the boiler to be forced to the maximum or

minimum power. Enable the test function and OO will appear on

the right-hand display (see Fig. 3.8).

To select operation at maximum power, press the programming

key

, two dashes will appear at the top of the right-hand

display (see Fig. 3.9).

. 3.27

This function is disabled when you press reset key to quit the

adjustments menu.

To select operation at minimum power, press the programming

key

, two dashes will appear at the bottom of the right-hand

display (see Fig. 3.10). This function is disabled when you press

reset key "H" to quit the adjustments menu.

Note: The boiler can be forced to the maximum and minimum

. 3.28

power even without enabling the test function via the

adjustments menu:

a - by pressing the Reset key for 5 seconds, the boiler is

automatically forced to test mode and t-- will be displayed,

the boiler is now in the test mode for the maximum heating

power, to force the boiler to maximum output for hot water it

is necessary to press the

dashes appear at the top of the right-hand display (see Fig.

3.9). This function is disabled by pressing the reset key .

. 3.29

b - by pressing the

minimum power, two dashes appear at the bottom of the

right-hand display (Fig. 3.10). This function is disabled by

pressing the reset key.

P P 5 5

URVE

NCLINE

-4 --8 --12 --16

temp. esterna [°C]

External temperature (°C)

t t

and

key, the boiler is forced to operate at

Fig. 3.24

2,5

1,5

1,2

0,5

0,3

keys together, two