1
A Honeywell Company
certified Qualitysystem
ISO 9001 / EN 29001
Reg. Nr. 10529
INTRODUCTION
The burner control box DMG 971 controls and supervises
power burner for gas and dual fuel. The control box is
approved and certified according the relevant European
standards. The use on direct air heaters according DIN 4794
is also possible.
The microprocessor- based programming sequence ensu-
res extremely stable timings independent of voltage varia-
tions, ambient temperature and/or switch-on cycles. The
built-in information system not only provides a continuous
monitoring of the actual state of the box (very helpful es-
pecially for monitoring the start-up phase) but also informs
about the cause of a possible lock out. The lock out cause
is stored in such a way that it can be retrieved even after a
power failure.
The control box is designed for maximum safety in case of
fluctuations in the voltage supply. If the mains voltage drops
below the permitted level, operation is interrupted and the
control box automatically prevents the start sequence from
being repeated. In this way, the safety of the system is not
put at risk by a drop in the mains voltage. This low-voltage
protection works not only during start-up but also perma-
nently during operation.
CONSTRUCTIONAL FEATURES
Microprocessor, electronic components, output relais and
flame amplifier are placed on two printed circuit boards.
These plus the lockout- and reset circuit are well protected
inside a flame resistant, plug-in type plastic housing.
The reset switch for reset / remote lockout with its built-in
LED for displaying the information system plus the central
fixing screw are placed on top of the housing.
The wiring base S98 is equipped with spare- and
extraterminals and allows together with a variety of cable
entry points utmost flexibility of electrical wiring.
The DMG 971 is funstionally compatible to MMI 811 and
MMI 811.1
Please note: Is the DMG 971 to be used to
replace the MMI 811 or 811.1, care has to be
taken to make sure the air proving switch (LW) is
wired between terminals 4 and 7 and not like on
the MMI between 5 and 7.
DMG 971
Gas Burner Safety Control
For 2-stage forced draught and combi
oil/gas burners
Possible flame detectors:
- Ionisation probe
- Infrared flicker detector 1020
- UV flame sensor UVD 971
TECHNICAL DATA
Operating voltage
220 / 240 V (-15... +10%)
50 Hz (
±
5%)
Fuse rating
10 A fast, 6 A slow
Power consumption
ca. 15 VA
Max. load per output
- term. 3 ignition trafo
1.5 A, cos
ϕ
0.2
- term. 4 motor
2.0 A, cos
ϕ
0.4
- term. 5 + 6 solenoid valves
1.0 A, cos
ϕ
0.4
- term. B alarm indicator
1.0 A, cos
ϕ
0.4
total load
5.0 A, cos
ϕ
0.4
max. 10 A during 0.5 sec
Air proving switch
1 working contact 4 A, 230V
Stray light monitoring
5 sec
Sensitivity (operation)
1
µ
A
Min. required ion. current
1.5
µ
A
Sensitivity for stray light
0.4
µ
A
Ionisation probe insulation
Probe - earth
greater than 50 M
Ω
stray capacity
Probe - earth
less than 1000 pF
cable lenght
< 3 m
Flame detectors
IRD 1020
side-on or end-on viewing
UVD 971
end-on viewing
Weight incl. Wiring base
190 g
Mounting position
any
Protection class
IP 40
Approved ambient parameter
for control and flame detector
max. 95% at 30
°
C
- for operation
-20
°
C... +60
°
C
- for storage
-20
°
C... +80
°
C
Build-up of ice, penetration of water and condensing
water are inadmissible
Approvals according
to European standards
EN 298 and EN 230, as
well as all other relevant
Directives and standards
Classified acc. to EN 298
FTLLXN
Timings (sec.)
0737.11-00-e/01/99
Model
waiting time
max. reaction time for
supervised
pre-ignition
ignition time
Stray light
safety time
delay
start
air proving switch
pre-purge time
time
total
monitoring
2nd-stage
tlw
tv1
tvz
tz
tf
ts
tv2
01
0
60
24
3
5
5
3
12.5