Technical data

36
MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B
Check the electrical connections to the thermostat and the other
external controls. Checking tightness (hydraulics, combusted gas
discharge and gas).
1.3 Switching the boiler on
Turn the boiler on (230 V).
Set the boiler regulation according to the heating request.
The boiler will begin an automatic venting-programm (which lasts
approx. 3 minutes) and will do this every time the power supply is
isolated.
The boiler is now ready to operate. The current operating status is
shown on the display. The display shows O.
1.4 Setting the gas/air ratio (Full load)

Belgium: Any intervention on the gas valve unit is strictly
forbidden.
The boiler is preset in the factory to operate on natural gas.
*In the event of forced operation at low speed, the second figure indicates
the operating code.
Unscrew the flue gas requirement plug.
Connect the combusted gas analyser.
Set the boiler to full load.
Press the  key. The display shows H:3: The full 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 A on the gas valve unit.
If the rate is too high, turn the screw A clockwise to reduce the gas
flow.
If the rate is too low, turn the screw A 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.
Values: Setting
Boiler type Fan speed (rpm)* CO
2
(%) CO
2
(%)
Full load H:3
Natural gas Propane Natural gas Propane
24 ca. 4600 ca. 4400 8.8 ±0.1 10.5 ±0.3
24/28MI ca. 5500 ca. 5200 8.8 ±0.1 10.5 ±0.3
30/35MI ca. 6300 ca. 6000 8.8 ±0.1 10.5 ±0.3
34/39MI ca. 6700 ca. 6400 8.8 ±0.1 10.5 ±0.3