Fan Speed Calibration; Adjustment Of The Air-Gas Ratio - Immergas MAGIS COMBO PLUS V2 Series Instructions And Recommendations For The Installer

3.11 FAN SPEED CALIBRATION

Verification and calibration are necessary, in the case of
transformation to other types of gas, in the extraordi-
nary maintenance phase with replacement of the PCB,
air/gas circuit components or in the case of installations
with flue extraction systems, with horizontal concentric
pipe measuring more than 1 metre.
The indoor unit heat output is correlated to the length of the air
intake and flue exhaust pipes.
This decreases with the increase of pipe length.
The indoor unit leaves the factory adjusted for minimum pipe
length (1m). It is therefore necessary, especially in the case of max-
imum pipe extension, to check the Δp gas values after at least 5
minutes of the burner operating at nominal heat output, when the
temperatures of the intake air and exhaust flue gas have stabilised.
Adjust the nominal and minimum output in the domestic hot
water and central heating modes according to the values in the ta-
ble in the indoor unit manual using the differential manometers
connected to the Δp gas pressure points (Det. 9-Fig. 47).
Enter the configurations menu and regulate the following param-
eters (Parag. 3.13);
- DHW minimum no. of fan revs "S 00";
- DHW maximum no. of fan revs "S 01";
- delete ignition stage "S 02".
Listed below are the default settings featured:
Parameter ID
DHW minimum no.
S 00
of fan revs
DHW maximum no.
S 01
of fan revs
Ignition phase fan
S 02
speed

3.12 ADJUSTMENT OF THE AIR-GAS RATIO

Calibration of minimum CO
output).
Enter the chimney sweep phase without withdrawing domestic
hot water and take the selector switches to minimum until "0" is
seen on the display.
To have an exact value of CO
pling probe to the bottom of the sample point, then check that the
CO value is that specified in the table, otherwise adjust the screw
2
(Det. 3Fig. 65)(Off-Set adjuster).
76
Description
Operating speed of the fan at
minimum DHW output
Operating speed of the fan at
maximum DHW output
Operating speed of the fan
during the ignition phase
(minimum central heating
2
the technician must insert the sam-
2
Range Default
G20: 1300
900 ÷ 1500 (RPM) G30: 1300
G31: 1300
G20: 5100
3000 ÷ 6100 (RPM) G30: 4800
G31: 5400
0 - 100%
Customised value
16