37
08/06/06 - 300008460-001-B
MCR 24, 24/28 MI, 30/35 MI, 34/39 MI
1.5
Setting the gas/air ratio (Part load)
Set the boiler to part load.
Press the
-
key until the
L:3
symbol is displayed: The part load is set.
Measure the O
2
or CO
2
content in the flue gases.
If this rate does not match the parameter value, correct the gas/air
ratio using the adjustment screw
B
on the gas valve unit.
If the rate is too high, turn the screw
B
clockwise to reduce the gas
flow.
If the rate is too low, turn the screw
B
anti clockwise to increase the
gas flow.
Check the flame via the flame detection cell. It must not go out.
Check that the analysis probe is leakproof against gas at the
sampling level point, the extremity of the probe is in the centre
of the smoke evacuation pipe
Repeat the high speed test and the low speed test as often as
necessary until the correct values are obtained without having to
make additional adjustments.
1.6
Final checks before commissioning
Remove the analysis sensor
.
Replace the plastic plug onto the measuring tube.
Put the upper front panel in place. Tighten the screws
.
To return to normal configuration, press briefly on button
.
if you do not press any keys, return to normal confiuration after
15 minutes.
Check the water pressure in the installation. Top up with more water
if necessary.
Values: Setting
Boiler type
Fan speed (rpm)*
CO
2
(%)
CO
2
(%)
Part load: L:3
Natural gas
Propane
Natural gas
Propane
24
ca. 1300
ca. 2000
8.8 ±0.1
10.5 ±0.3
24/28MI
ca. 1300
ca. 2000
8.8 ±0.1
10.5 ±0.3
30/35MI
ca. 1300
ca. 2000
8.8 ±0.1
10.5 ±0.3
34/39MI
ca. 1300
ca. 2000
8.8 ±0.1
10.5 ±0.3
