Immergas EOLO STAR 24 5E, Instruction Manual

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3.8  "CHIMNEY SWEEP” FUNCTION.

When activated, this function forces the boiler 

at max. output (P06) for 15 minutes.

In this state all adjustments are excluded and 

only the temperature safety thermostat and the 

limit thermostat remain active (temperature is 

limited by the parameter “P12”). To activate the 

chimney sweep function, press the Reset key for 

at least 5 seconds. Its activation is indicated by 

the flashing symbols (8 and 11 Fig. 2-1). This 

function allows the technician to check the 

combustion parameters. After the checks disable 

the function, switching the boiler off and then on 

again or simply by pressing the reset button for 

about 5 seconds (1 Fig. 2-1).

The maximum heating power can be set to P06 

and P05 by pressing buttons (3 or 4). The power 

can be adjusted by one percentage point by 

pressing buttons (5 or 6).
If you wish to run the "chimney sweep" function 

in D.H.W., open a D.H.W. tap after switching 

the burner on.

Attention:

 ensure a sufficient DHW flow, in 

order to avoid high temperatures of the water.
The maximum boiler power can be set to 0% and 

100% by pressing buttons (3 or 4). The power can 

be adjusted by one percentage point by pressing 

buttons (5 or 6).

Note:

 the display of the boiler power percentage 

alternates with the display of the temperature 

read by the flow probe.

3.9  PUMP ANTI-BLOCK FUNCTION.

In the “summer” functioning mode ( ) the 

boiler has a function that starts the pump at least 

once every 24 hours for 30 seconds in order to 

reduce the risk of the pump becoming blocked 

due to prolonged inactivity.

In the “winter” functioning mode ( ) the boiler 

has a function that makes the pump start at least 

once every 3 hours for 30 seconds.

3.10 DOMESTIC HOT WATER CIRCUIT 

ANTI-EXTRUDER FUNCTION.

This function reduces the heating temperature 

to 57°C if the domestic hot water circulation is 

detected in the heating mode. The function can 

be enabled using parameter (P3).

3.11 RADIATORS ANTIFREEZE 

FUNCTION.

If the system return water is below 4°C, the boiler 

starts up until reaching 42°C.

3.12 P.C.B. PERIODICAL SELF-CHECK.

During functioning in central heating mode or 

with boiler in standby, the function activates 

every 18 hours after the last boiler check/power 

supply. In case of functioning in domestic hot wa-

ter mode the self-check starts within 10 minutes 

after the end of the withdrawing in progress, for 

duration of approx. 10 seconds.

NOTE:

 during self-check, the boiler remains off, 

including signalling.

Id 

Parameter

Parameter

Description

Range

(ref. 9 Fig. 2-1)

Default

P18

Display lighting

Establishes the display lighting mode:

00 = (Off) the display lights on if buttons are pressed (time out = 15 seconds).

01 = (Auto) equal to 00, it also lights on to indicate the flame presence.

02 = (On) always on.

00 - 02

01

P19

Flow off tempera-

ture increase 

(Central heating)

Increases the flow off temperature at ignition only in the first 30 seconds.

on - oF

on