Immergas Hercules Condensing 26 3 ErP, Instruction And Recommendation Booklet

31

INS

TALLER

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ER

MAINTEN

AN

CE TECHNI

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AN

3.4  CONVERTING THE BOILER  

TO OTHER TYPES OF GAS.

If the boiler has to be converted to a different 

gas type to that specified on the data nameplate, 

request the relative conversion kit for quick and 

easy conversion.

The gas conversion operation must be carried 

out by an authorised company (e.g. Authorised 

After-Sales Technical Assistance Service).

To convert to another type of gas the following 

operations are required:

- disconnect the appliance;
-  replace the nozzle located between the gas pipe 

and gas/air mixing sleeve (Part. 16 Fig. 1-27);

- re-power the appliance;
-  calibrate the number of fan revolutions (parag. 

3.5):

- adjust the correct air/gas ratio (parag. 3.6);
-  seal the gas flow rate regulation devices (if set-

tings are modified);

- after completing the conversion, apply the 

sticker, contained in the conversion kit, near 

the data nameplate. Using an indelible marker 

pen, delete the data relative to the old type of 

gas.

These adjustments must be made with reference 

to the type of gas used, following that given in 

the table (Par. 3.18).

3.5  CALIBRATION OF NUMBER OF FAN 

REVS.

Attention:

 Verification and calibration is neces-

sary, in the case of transformation to other types 

of gas, in the extraordinary maintenance phase 

with replacement of the PCB air/gas circuit com-

ponents or in the case of installations with fume 

extraction systems, with horizontal concentric 

pipe measuring more than 1 metre.
The boiler heat output is correlated to the length 

of the air intake and flue exhaust pipes. This 

decreases with the increase of pipe length. The 

boiler leaves the factory adjusted for minimum 

pipe length (1m). It is therefore  necessary, espe-

cially in the case of maximum pipe extension, to 

check the ∆p gas values after at least 5 minutes 

of the burner operating at nominal heat output, 

when the temperatures of the intake air and ex-

haust flue gas have stabilised. Adjust the nominal 

and minimum heat output in the domestic hot 

water and central heating modes according to 

the values in the table (Par. 3.18) using the dif-

ferential manometers connected to the ∆p gas 

pressure points (29 and 30 Fig. 1-27).
Access the configurations menu under the “SER-

VICE” item and adjust the following parameters 

(Par. 3.8):

- boiler maximum heat output “P62”;
- boiler minimum heat output “P63”;
- maximum central heating output “P64”;
- minimum central heating output “P65”;
Below find the default settings present on the 

boiler:

Hercules Condensing 26 3 ErP

P62

G20:

5060 (rpm)

LPG: 

4400 (rpm)

P63

G20: 

1240 (rpm)

LPG: 

1140 (rpm)

P64

G20: 

4700 (rpm)

LPG: 

4100 (rpm)

P65

G20: 

1240 (rpm)

LPG:

1140 (rpm)

Hercules Condensing 32 3 ErP

P62

G20:

4700 (rpm)

LPG: 

4200(rpm)

P63

G20: 

1260 (rpm)

LPG: 

1160 (rpm)

P64

G20: 

4700 (rpm)

LPG: 

4200 (rpm)

P65

G20: 

1260 (rpm)

LPG:

1160 (rpm)

3.6  ADJUSTMENT OF THE AIR-GAS 

RATIO.

Calibration of the minimum CO

2

 (minimum 

central heating power).

Enter the chimney sweep phase without with-

drawing domestic hot water and take the se-

lector switches to minimum (turn them in an 

anti-clockwise direction until "0" is seen on the 

display). To have an exact value of CO

2

 in the flue 

gas the technician must insert the sampling probe 

to the bottom of the sample point, then check 

that the CO

2

 value is that specified in the table, 

otherwise adjust the screw (3 Fig. 3-3) (Off-Set 

adjuster). To increase the CO

2

 value, turn the 

adjustment screw (3) in a clockwise direction 

and vice versa to decrease it.
Calibration of the maximum CO

2

 (nominal 

central heating power).

On completion of the adjustment of the mini-

mum CO

2

 keeping the chimney sweep function 

active, take the heating selector switch to maxi-

mum (turn it in a clockwise direction until “99” 

is seen on the display). To have an exact value of 

CO

2

 in the flue gas the technician must insert 

the sampling probe to the bottom of the sample 

point, then check that the CO

2

 value is that speci-

fied in the table, otherwise adjust the screw (12 

Fig. 3-3) (gas flow rate regulator).

To increase the CO

2

 value, turn the adjustment 

screw (12) in an anti-clockwise direction and vice 

versa to decrease it.

At every adjustment variation on the screw 12 it 

is necessary to wait for the boiler to stabilise itself 

at the value set (about 30 sec.).

Hercules Condensing 26 3 ErP

CO

2

 at nominal 

output 

(central heating)

CO

2

 at minimum 

output 

(central heating)

G 20

9.40% ± 0.2

8.90% ± 0.2

G 30

12.00% ± 0.2

11.80% ± 0.2

G 31

10.60% ± 0.2

10.20% ± 0.2

Hercules Condensing 32 3 ErP

CO

2

 at nominal 

output 

(central heating)

CO

2

 at minimum 

output 

(central heating)

G 20

9.40% ± 0.2

8.90% ± 0.2

G 30

12.30% ± 0.2

11.90% ± 0.2

G 31

10.50% ± 0.2

10.30% ± 0.2

3.7  CHECKS FOLLOWING 

CONVERSION TO ANOTHER TYPE 

OF GAS.

After making sure that conversion was carried 

out with a nozzle of suitable diameter for the 

type of gas used and the settings are made at the 

correct pressure, check that the burner flame is 

not too high or low and is stable (does not detach 

from burner);

N.B.:

 all boiler adjustment operations must be 

carried out by a qualified company (e.g. Author-

ised After-Sales Assistance).