Adapting To Another Gas; Switching From Natural Gas To Propane; Setting The Control Unit Parameters - DeDietrich MCR 24 Technical Instructions

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.

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.
Natural gas H Nominal power
(Factory setting :
Gn by default)
Minimum output
Maximum DHW
speed
Propane (Factory Nominal power
setting : Pr)
Minimum output
Maximum DHW
speed
44

Adapting to another gas

Parameter
P17
h3
P19
L3
P18
H3
P17
h3
P19
L3
P18
H3
MCR 24, 24/28 MI, 30/35 MI, 34/39 MI
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.
After this setting, the boiler will not have an optimum setting for
propane.
For the precise setting, use a CO
settings procedures:
See "Modify parameters" and "Setting the gas/air ratio - Full
load + Part load"
Nominal fan Nominal fan speed
speed (rpm)
(rpm) MCR 24/28MI
MCR 24
3700 3700
1300 1300
4600 5500
3500 3500
2000 2000
4400 5200
measuring device and apply the
2
Nominal fan Nominal fan
speed speed
(rpm) (rpm)
MCR 30/35MI MCR 34/39MI
4100 4700
1300 1300
6300 6700
3900 4500
2000 2000
6000 6400
08/06/06-300008460-001-B
CO
2
%
8.8±0.3
8.8±0.3
8.8±0.3
10.5±0.3
10.5±0.3
10.5±0.3