Immergas MINI EOLO 28 3E, Instruction And Warning Booklet

26 

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3.8  POSSIBLE ADJUSTMENTS.

N.B.: 

to adjust the gas valve, remove the plastic 

cap (6); after adjusting, refit the cap.
• Preliminary calibration operations.
  - Set parameter P4 at 0%.
  - Set parameter P5 at 99%.
• Activate the chimney sweep function.
  - Enter the “DHW chimney sweep” mode, 

opening a DHW cock.

• Adjustment of boiler nominal thermal heat 

output.

  - Set the maximum output (99%) using the 

buttons (5 and 6 Fig. 2-1).

  -  Adjust the boiler nominal power on the brass 

nut (3 Fig. 3.3), keeping to the maximum 

pressure values stated in the tables (Par. 

3.18) according to the type of gas; by turning 

clockwise the heat potential increases, anti-

clockwise it decreases.

• Adjustment of boiler minimum thermal heat 

output.

N.B.:

 only proceed after having calibrated the 

nominal pressure.

  - Set the minimum output (0%) always using 

the buttons (5 and 6 Fig. 2-1).

  - Adjust the minimum thermal input by op-

erating on the cross plastic screws (2) on the 

gas valve maintaining the brass nut blocked 

(3);

• Exit the “Chimney sweep” mode and keep the 

boiler functioning.

•  Adjustment of the boiler minimum heat output 

in heating phase.

N.B.:

 only proceed after having calibrated the 

minimum boiler pressure.

  - To adjust the minimum heat output during 

the heating phase, change parameter (P4), 

increasing the value the pressure increases, 

reducing it the pressure drops.

  - The pressure to which the boiler minimum 

heat output must be adjusted, must not be 

lower than that stated in the tables (Par. 3.18).

• Adjustment (any) of the boiler maximum heat 

output in heating phase.

  - To adjust the maximum heat output during 

the heating phase, change parameter (5), 

increasing the value the pressure increases, 

reducing it the pressure drops.

  - The pressure to which the boiler maximum 

heat output must be adjusted in central heat-

ing phase, must not be carried out in refer-

ence to that stated in the tables (Par. 3.18).

3.9  AUTOMATIC SLOW IGNITION 

FUNCTION WITH TIMED RAMP 

DELIVERY.

In ignition phase, the P.C.B. supplies constant 

gas with pressure proportional to the parameter 

“G2” set.

3.10 “CHIMNEY SWEEP” FUNCTION.

When activated, this function forces the boiler 

to variable output for 15 minutes.

In this state all adjustments are excluded and only 

the safety thermostat and the limit thermostat 

remain active. To activate the chimney sweep 

function, press the Reset button (1) for 8 seconds 

in absence of DHW requests, its activation is sig-

nalled by the indication of the flow temperature 

and the flashing 

 and 

 symbols. 

This function allows the technician to check 

the combustion parameters. Once the function 

is activated, it is possible to select whether to 

perform the check in CH status, regulating the 

parameters with buttons (5 and 6) or in DHW 

mode opening any DHW cock and always regu-

late the parameters with the buttons (5 and 6).

Functioning in CH or DHW mode is visualised 
by the relative flashing 

 or 

symbols.

On completion of the checks, deactivate the 

function by pressing the Reset button (1) for 

8 seconds.

3.11 PUMP ANTI-BLOCK FUNCTION.

The boiler has a function that starts the pump once 

every 24 hours for the duration of 30 seconds in 

order to reduce the risk of the pump becoming 

blocked due to prolonged inactivity.

3.12 THREE-WAY ANTI-BLOCK 

FUNCTION.

The boiler is supplied with a function that ac-

tivates the motorises three-way unit every 24 

hours, carrying out a complete cycle in order 

to reduce the risk of three-way block due to 

prolonged inactivity.

3.13 RADIATORS ANTI-FREEZE 

FUNCTION.

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

starts up until reaching 42°C.

3.14 P.C.B. PERIODICAL SELF-CHECK.

During functioning in central heating mode or 

with boiler in stand-by, 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.

N.B.:

 during self-check, the boiler remains off, 

including signalling.

3.15 SOLAR PANELS COUPLING 

FUNCTION.

The boiler is set-up to receive pre-heated water 

from a system of solar panels up to a maximum 

temperature of 65°C. In all cases, it is always 

necessary to install a mixing vale on the hy-

draulic circuit upstream from the boiler on the 

cold water inlet.

Note:

 for good functioning of the boiler; the 

temperature selected on the solar valve must 

be 5°C greater with respect to the temperature 

selected on the boiler control panel.
For correct use of the boiler in this condition, 

parameter P3 (DHW thermostat) must be set at 

“1” and the parameter P9 (DHW ignition delay) 

at a temperature sufficient to receive water from 

a storage tank situated upstream from the boiler. 

The greater the distance from the storage tank, 

the longer the stand-by time to be set. When 

these regulations have been performed, when 

the boiler inlet water is at the same or greater 

temperature with respect to that set by the DHW 

selector switch, the boiler does not switch on.