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Honeywell Satronic DMG 973 Manual

Gas burner safety control
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Gas Burner Safety Control
For 2-stage forced draught and combi
oil/gas burners, facility to connect an air
damper unit
Possible flame detectors:
- Ionisation probe
- Infrared flicker detector 1020.1
- UV flame sensor UVD 971
The burner control box DMG 973 controls and supervises
power burner for gas and dual fuel. The control box is
currently under approval according the relevant European
standards. The use on direct air heaters according DIN 4794
is also possible.
With the facility to connect an air damper unit, a 2 stage
operation with two fuel valves or a modulating operation
with one fuel valve is 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.
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 973 is funstionally compatible to MMI 813 and
MMI 813.1
Please note: Is the DMG 973 to be used to
replace the MMI 813 or 813.1, 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.
Table of timings (sec.)
max. reaction
time for air
proving switch
LK-open command
during pre-purge
A Honeywell Company
Operating voltage
Fuse rating
Power consumption
Max. load per output
- term. 3 ignition trafo
- term. 4 motor
- term. 5 + 6 solenoid valves
- term. C air damper
- term. B alarm indicator
total load
Direct lockout after a loss-of-flame during operation
Air proving switch
Sensitivity (operation)
Min. required ion. current
Sensitivity for stray light
Ionisation probe insulation
stray capacity
cable lenght
Flame detectors
IRD 1020.1
UVD 971
Weight incl. Wiring base
Mounting position
Protection class
Approved ambient parameter
for control and flame detector
- for operation
- for storage
Build-up of ice, penetration of
water and condensing water are
Approvals according
to European standards
Classified acc. to EN 298
post-ignition Stray light
DMG 973
220 / 240 V (-15... +10%)
50 Hz ( ±5%)
110 / 120 V (-15... +10%)
60 Hz ( ±5%)
10 A fast, 6 A slow
ca. 12 VA
1.5 A, cos ϕ 0.2
2.0 A, cos ϕ 0.4
1.0 A, cos ϕ 0.4
1.0 A, cos ϕ 0.4
1.0 A, cos ϕ 0.4
5.0 A, cos ϕ 0.4
max. 20 A during 0.5 sec
1 working contact 4 A, 230V
1 µA
1.5 µA
Probe - earth
greater than 50 MΩ
Probe - earth
less than 1000 pF
< 3 m
side-on or end-on viewing
end-on viewing
190 g
IP 40
max. 95% at 30° C
-20° C... +60° C
-20° C... +80° C
EN 298 and EN 230, as
well as all other relevant
Directives and standards
safety delay
monitoring time
terminal 6/C



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  Summary of Contents for Honeywell Satronic DMG 973

  • Page 1 DMG 973 A Honeywell Company Gas Burner Safety Control For 2-stage forced draught and combi oil/gas burners, facility to connect an air damper unit Possible flame detectors: - Ionisation probe - Infrared flicker detector 1020.1 - UV flame sensor UVD 971...
  • Page 2: Application Features

    APPLICATION FEATURES 1.2 Lock-out diagnoses In case of a failure the LED is permanently illuminated. Every 1. Information system 10 seconds the illumination is interrupted by a flash code, which indicates the cause of the error. Therefore the following The information system is microprocessor based and re- sequence is performed which is repeated as long as the unit ports on all aspects of burner control box operation and is not reset.
  • Page 3 3. Lock out and reset 7. Mounting and electrical wiring The unit can be reset or brought into lock out mode in two Wiring base: different ways: – 3 earth terminals with additional terminal for burner earthing Internal – 3 neutral terminals with internal permanent connection to In the lock out case the unit can be reset by pushing the built- neutral terminal 8 in button meaning a new start-up cycle is performed.
  • Page 4 INSTALLATION INSTRUCTIONS AND MAINTENANCE 3. Fault finding The built-in information system facilitates the trouble shoot- 1. Important notes ing in the case of problems occurring during start-up or during operation. – The controls must be installed by qualified personnel A list of possible lock out messages can be found in only.
  • Page 5 CIRCUIT AND TIMING DIAGRAM DMG 973 WITH AIR DAMPER MOTOR Mains switch Gas proving switch max. 10A fast Limit thermostat 6A low Control thermostat External reset and lock out button Ionisation probe (IRD 1020.1, UVD 970 see separate diagram) Ignition Burner motor Solenoid valve, 1st-stage Solenoid valve, 2nd-stage...
  • Page 6 Plug type, 3 core cable, 0.6 m with tag wire ends 7236001 The above ordering information refers to the standard version. Special versions are also included in our product range. Specifications subject to change without notice DMG 973 A Honeywell Company Satronic AG Honeywell-Platz 1 Postfach 324 CH-8157 Dielsdorf...