MF2 CONTROL BOX
CONTROL BOX FOR FORCED DRAUGHT
BURNERS FOR GAS AND OIL FUEL
DESCRIPTION
The MF2 control box is suitable for draught burners for gas
and oil fuel, for civil and industrial applications, with two
flame levels. This control can alternatively employ as
detection flame sensor both a probe, which makes use of
the rectification property of the flame (ionization), and a UV
phototube.
According to TÜV Bayern, Monaco, the control is in
compliance with the German regulation DIN 4788, part 3 ,
for power up to 350KW. It also obtained the DIN-DVGW
89.09fBN approval, now expired and not renewable.
The “Laboratorio di Macchine e Termotecnica del Centro
Studi ed Esperienze” in Rome - Capannelle tested the MF2
control for power up to 2332KW, which obtained the
certification n° 3704/187/77/21 and the approval of the
Ministry of the Interior for fire prevention (circulars n°68 and
n°42).
TECHNICAL DATA:
Supply voltage: 220V (-15%+10%)
50Hz (±5%)
on request: 110V
Operating temperature range: -10°C +60°C
Protection degree: IP40
Starting power consumption: 9 VA
Operating power consumption: 3,5 VA
Contact rating I max
- burner motor: 4 A
- valves (EV1, EV2): 2 A
- ignition transformer: 2 A
- alarm: 1 A
- regulators (T, PA, PG): 6 A
Times:
- prepurge time (TV): 30 s
- safety time (TS): 3 s
- drop out time on running flame failure: <1 s
- delay between EV1 - EV2: 30 s
- postpurge time: 5 s
Flame control
- minimum ionization current: 0,5 µA
- recommended ionization current: 7 µA
- minimum insulation resistance of cable and
flame detector device to earth: > 50 MΩ
- voltage on the detection probe: 350 V
- recommended operating voltage with phototube: >15µ A
Weight including socket: 600 g
CONSTRUCTION
The components of the control are fixed on a frame made
of pressed thermohardening material, with high dielectric
resistance. The enclosure protects the control from
mechanical damages, dust and dirt coming from the
outside during the installation.
Flexible unipolar conductors of different sizes connect the
components of the control, except for the flame detection
and prepurge control circuit, which is mounted on a printed
circuit.
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