Technical data

44
MCR 24, 24/28 MI, 30/35 MI, 34/39 MI 08/06/06-300008460-001-B
Adapting to another gas

For Belgium: Only SERV’élite is authorised to carry out the
conversion of this appliance.
MCR boilers are preset in the factory for natural gas H.

The actions described below must be carried out by a
qualified technician.

For Belgium: The boiler installation and gas connection
must be carried out by a qualified professional in
compliance with the NBN D 51.003, NBN D 30.003, NBN B
61.001, NBN B 61.002 and NBN D 51.006 standards.
1 Switching from Natural Gas to Propane
The conversion from Natural Gas to Propane requires only the
adjustment of the burner and the fan speed.
2 Setting the control unit parameters
For conversion to propane
To obtain the gas valve setting used to start up with propane, use the
following instructions:
- GN (G20) to G31: Turn the high speed adjustment screw 2
rotations clockwise
or
- Turn high speed screw clockwise until it is closed. Turn high speed
adjustment screw 3.5 - 4 rotations counter clock wise.
After this setting, the boiler will not have an optimum setting for
propane.
For the precise setting, use a CO
2
measuring device and apply the
settings procedures:
Z
See "Modify parameters" and "Setting the gas/air ratio - Full
load + Part load"
Parameter Nominal fan
speed
(rpm)
MCR 24
Nominal fan speed
(rpm)
MCR 24/28MI
Nominal fan
speed
(rpm)
MCR 30/35MI
Nominal fan
speed
(rpm)
MCR 34/39MI
CO
2
%
Natural gas H
(Factory setting :
Gn by default)
Nominal power
h3
P17 3700 3700 4100 4700 8.8±0.3
Minimum output
L3
P19 1300 1300 1300 1300 8.8±0.3
Maximum DHW
speed
H3
P18 4600 5500 6300 6700 8.8±0.3
Propane (Factory
setting : Pr)
Nominal power
h3
P17 3500 3500 3900 4500 10.5±0.3
Minimum output
L3
P19 2000 2000 2000 2000 10.5±0.3
Maximum DHW
speed
H3
P18 4400 5200 6000 6400 10.5±0.3