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TECHNICAL FEATURES
1. Flame detection
The following types of flame detector can be employed:
– Ionisation electrode, where the mains supply provides a
neutral earth connection. Suitable for gas burners (signal
current from flame cannot be influenced by interference
from ignition spark).
– UV sensor type UVZ 780 red, suitable for gas and combi
burners.
– Infra-red flicker detector type IRD 1020.1 for all types of
burner.
2. Burner Control
– The burner controls features a low-voltage protection. If
the supply voltage dropps below 160 V during operation,
the burner switches-off. When the supply voltage raises
above 180 V, the burner performs a restart independently.
– The MMG control boxes only operate when a load is
connected to terminal 5. If the fuel valve is isolated during
the pre-purge by way of an external switch contact, a
resistor with a value of max. 22 kΩ/4 watts, must be
connected between terminals 5 and 8.
– Functional check of the air proving switch before the
start, and monitoring of the air pressure during pre-purge
as well as during normal operation. In normal use, switch
contacts with a rating of 4 A / 220 V are sufficient.
– On the MMG 810.1, switch contacts (e.g. valve end
contact) can be wired between terminals 1 and 9. These
contacts are checked for proper closure during the
burner start phase. The connection between terminals 1
and 9 must be complete during the start phase.
– The MMG 810.1 control box monitors the ignition spark
if the UVZ 780 (red) is used for flame detection, and
terminals C and 9 are wired together.
3. Safety
The design/construction and programme sequence of the
control boxes in the MMG series conform to the present
applicable European standards and regulations.
4. Installation
At the base:
– 3 earth terminals with additional terminal for burner
earthing
– 3 neutral terminals with internal permanent connection to
neutral terminal 8
– 2 independant spare terminals (S1 and S2)
– extra terminals A, B and C are standard
– 2 slide-in plates and 2 easy knock out holes plus 2 knock
out holes in the base bottom faciliate the base wiring
Please note
To assist trouble-free operation the main neutral connection
terminal 8 in the wiring base must be fully tightened. The
terminal screws are already in the undone position. To
connect a wire to the terminal, the screw only needs to be
fastened.
General:
– Can be mounted in any position, insulated as per IP 44
standard (unaffected by water spray). The control box
and detector probes should however not be subjected to
excessive vibration.
– The applicable installation regulations must be observed
during installation.
COMMISSIONING AND MAINTENANCE
1. Important
– The wiring must be checked exactly when commissioning
the installation. Incorrect wiring could damage the control
box, putting the safety of the burner system at risk.
– The chosen fuse rating must not, on any account, be
higher than the value given in the technical data. Failure
to observe this instruction could, in the case of a short
circuit, have serious consequences for the control box or
burner system.
– For safety reasons, it must be ensured that the control
box performs at least one normal shut-down during every
24 hour period.
– Switch off or disconnect the power before plugging in or
unplugging the unit.
– Control boxes are safety devices and should not to be
interfered with.
2. Functional Check
During commissioning and after an overhaul of the burner,
the following checks have to be carried out:
a) Starting test with closed manual valve and bridged gas
monitor contact:
–The device must go into a fault condition after the
safety period has elapsed.
b) Close the manual valve in operating position with the gas
monitor contact bridged.
–The device must go into a fault condition after a flame
failure.
c) Air pressure monitor contact interrupted:
–Device goes into a fault condition.
d) Bridge air pressure monitor contact before starting:
–Device must not start.
3. Trouble Shooting
Burner does not go into operation, programme indication
remains:
–Electrical connection defective.
–Thermostat or gas monitor "OFF".
Burner does not go into operation, programme indication
rotates continuously:
–Air pressure monitor defective, respectively, not in starting
position. (Working contact must be open).
– Connection term. 1 - term. 9 interrupted
– mains voltage < 180V
The automatic control switches to fault condition shortly
after the start of the pre-purge time (line within the blue
zone):
–Air pressure monitor contact does not close.
–No load on terminal 5.
–Flame signal.
Automatic control switches to fault condition during the pre-
purging (blue zone):
–No flame formation (ignition missing, valve does not
open, etc.)
–No flame signal or too weak flame signal (flame does not
adhere, poor insulation of the flame detector, burner not
properly connected to the earth conductor).
Automatic control switches to fault condition during the
operating position (red, resp. green zone):
–Flame lift-off
–Air pressure monitor contact opens
–Flame signal too weak.
MMG 810.1 / 811.1
