A Honeywell Company

MMI 813.1

Gas burner automatic

safety control
For 2-stage forced draught gas burners
Designated for an air damper control

Possible flame detectors:

- Ionization probe
- Infrared flicker detector

INTRODUCTION
The gas burner automatic safety control MMI 813.1 controls
and monitors blown gas- and combined burners of any
nominal thermal load (tested and certified according to
EN 298).
Together with an air damper motor, a 2-stage burner with TECHNICAL DATA
2 fuel valves, a 2-stage operation with 1 fuel valve or a Operating voltage 220 / 240 V (-15... +10%)
modulating system ave possible. 50 Hz (50 - 60 Hz)
Differing frequency results in a proportional
deviation of the time.
Rating fuse max. 10 A rapid, 6 A slow
Power consumption 10 VA
Max. current per output
CONSTRUCTIONAL FEATURES term. 3 2A, cos ϕ 0.2
term. 4, B 2A, cos ϕ 0.4
The automatic control is housed in a non-inflammable, term. 5, 6, C 1A, cos ϕ 0.4
Total load 5A, cos ϕ 0.4
transparent, plug-in type plastic case and contains:
Amplifier sensitivity 1 µA
– Synchronous motor with speed reducer gears as the Minimum required
drive for the switching cam Ionization current 5 µA
– Switching cam with informative programme display in Flame detector cable max. 20 m cable length
colour Air pressure monitor 1 working contact 4 A, 220 V
– 12 times cam drive for controlling the programme Waiting time for
sequence malfunction remedy none
– Plug-in type circuit boards with the electronic components Running time
air damper for 90° max. 15 sec.
Flame detector
The following important indicating - and operating elements - Ionization probe
are located on the front panel of the automatic control: - Infrared flicker detector IRD 1020
– Illuminated pushbutton for indication of malfunctions Weight, incl. base 350 g
and reset Mounting position any
– Programme display in colour Insulation standard IP 44
– Screw for central mounting Admissible ambient
temperature for controller
and flame detector -20° C... +60° C
Classification acc. EN 298 BTLLXN

Automatic Control MMI 813.1

Model 23

Waiting time at start approx. tw 9

Maximum reaction time
of air pressure monitor tlw 10
Pre-purge time tv1 34
Air damper open signal
during pre-purge tlk 36.5
Pre-ignition time tvz 3
0708.24-01-e/04/99

Ignition time, overall tz 6

Ignition safety time ts 3
Delay time terminal 6 tv2 6

For external resetting, the remote reset device FR 870

(art. No. 70700) can be utilized. (Refer to documentation
750).
1
APPLICATION TECHNOLOGY FEATURES COMMISSIONING AND SERVICE/MAINTENANCE
1. Flame Monitoring 1. Important Remarks
The flame monitoring can be effected with the following – Before commissioning, the wiring has to be accurately
flame detectors: checked. Faulty wiring can damage the unit and endanger
– With ionization electrodes in power grids with earthed the safety of the installation.
neutral conductor, utilizable with gas burners (interference – The mains fuse has to be selected so that the limit values
effects of the ignition spark cannot influence the formation indicated under "Technical Specifications" are under no
of the flame signal). circumstances exceeded. Non-compliance with this
– With infrared flicker detector type IRD 1020 for all types regulation can have very serious consequences for the
of burners. control unit and for the installation in the case of a short-
circuit.
2. Burner Control – For safety reasons, at least one control shut-down per
– The burner controls features a low-voltage protection. If 24 hours must be assured.
the supply voltage dropps below 160 V during operation, – The control unit must be plugged-in or -out only when the
the burner switches-off. When the supply voltage raises mains supply has been disconnected.
above 180 V, the burner performs a restart independently. – Automatic burner safety controls are safety devices and
– The automatic burner controls MMI only operate, when a must not be opened.
load is connected to terminal 5. If the fuel valve is
interrupted by an external contact during the pre-purging 2. Functional Check
phase, a resistance of max. 22 kW, 4 Watt has to be During commissioning and after an overhaul of the burner,
applied bet-ween the terminals 5 and 8. the following checks have to be carried out:
– Functional test of the air pressure monitor before the a) Starting test with closed manual valve and bridged gas
startup and monitoring of the air pressure during the pre- monitor contact:
purging time, as well as in the operating condition of the – The device must go into a fault condition after the
burner. For normal applications a working contact with a safety period has elapsed.
power rating of 4 A / 220 V is sufficient. b) Close the manual valve in operating position with the gas
– In the case of the automatic control MMI 813.1, contacts monitor contact bridged.
can be installed between the terminals 1 and 9 (e.g., valve – The device must go into a fault condition after a flame
limit position contacts). These are checked for their failure.
correct closing position when the unit is started up. The c) Air pressure monitor contact interrupted:
connection 1-9 has to be closed during the starting – Device goes into a fault condition.
phase of the automatic control. d) Bridge air pressure monitor contact before starting:
– Device must not start.

3. Trouble Shooting
3. Safety Burner does not go into operation, programme indication
With respect to design and programme sequence, the gas remains:
burner automatic safety controls of the MMI type range – Electrical connection defective
comply with the currently applicable European standards – Thermostat or gas monitor "OFF"
and regulations.
Burner does not go into operation, programme indication
rotates continuously:
4. Mounting and Electrical Installation – Air pressure monitor defective, respectively, not in starting
Wiring base: position. (Working contact must be open).
– 3 earth terminals with additional terminal for burner – Connection term. 1 - term. 9 interrupted
earthing – mains voltage < 180V
– 3 neutral terminals with internal permanent connection to
neutral terminal 8 The automatic control switches to fault condition shortly
– 2 independant spare terminals (S1 and S2) after the start of the pre-purge time (line within the blue
– extra terminals A, B and C are standard zone):
– 2 slide-in plates and 2 easy knock out holes (PG11 – Air pressure monitor contact does not close
thread) plus 2 knock out holes in the base bottom faciliate – No load on terminal 5
the base wiring – Flame signal
General: Automatic control switches to fault condition during the pre-
– Mounting position as required, insulation standard IP 44 purge (blue zone):
(splash-proof). The automatic control and sensor should, – Air pressure monitor contact open
however, not be exposed to excessive vibration. – Flame signal (stray light)
– During mounting and installation, the applicable regula-
tions for installation have to be observed. Automatic control switches to fault condition during the
safety time (yellow 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
MMI 813.1

– Air pressure monitor contact opens

– Flame signal too weak.
2
 SCHEMATIC CONNECTION DIAGRAM AND PROCESS DIAGRAM MMI 813.1
WITH AIR DAMPER CONTROL

Ph max. 10 A rapid HS GW ST RT
6 A slow

1 2 A/3 4 5 6 C B 7 8 9

LW HS Main switch
GW Gas pressure switch
ST Limit thermostat
RT Control thermostat
IS Ionization probe
IS Z M V1 L SA Z Ignition
M Burner motor
V1 Solenoid valve 1st stage
WITHOUT AIR DAMPER CONTROL V2 Solenoid valve 2nd stage
L Air damper control unit
LW Air pressure monitor
SA External fault indication
tw Waiting time at start-up
Ph max. 10 A rapid HS GW ST RT tlw max. reaction time
6 A slow of air pressure monitor
tv1 Pre-purge period
tlk Air damper open signal
1 2 A/3 4 5 6 C B 7 8 9 during pre-purge
tvz Pre-ignition period
tz Overall ignition period
LW ts Safety period
tv2 Time delay terminal 6

IS Z M V1 V2 SA

tw tlw tv1 tlk tvz tz ts tv2

IRD CONNECTION
blue term. 8
IRD 1020 black term. 2
brown term. 9

SCHEMATIC DIAGRAM MMI 813.1

MMI 813.1

3
MMI WITH BASE MEASUREMENT OF THE FLAME SIGNAL
5

E 2
MMI 813.1

67
PG 11
91

+
The signal should
be greater than 5 µA

24
-
87 0 - 10 µA
0 - 100 µA
Slide-in plate
Reset button 24 The Satronic Ionimeter
is ideal for making
this measurement.
30
44
35

Earth
16
30
25

M4
16

30
ø 16 mm,
57-60 cable entry from below

IRD 1020 HOLDER M93

29 50 44 35
3
ø13.5
21.8

14

4.5
26
104

15.1

48
17 4

ø20.5

ORDERING INFORMATION

ITEM DESIGNATION ITEM NO.

Control unit Type MMI 813.1 mod. 23 0622220

Base for MMI 813.1 (without air damper) Wiring base 701 TTG-EN 70101
Base for MMI 813.1 (with air damper) Wiring base S 98 75310
Slide-in plate PG-plate 70502
optionally Cable clamping plate 70501
Flame detector IRD 1020 end-on viewing 16522
Flame detector IRD 1020 side-on left 16523
Flame detector IRD 1020 side-on right 16521
IRD mounting flange IRD Holder M93 59093
Flame detector cable 3-wire, 0.6 m 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.

MMI 813.1 A Honeywell Company Satronic AG

Honeywell-Platz 1
Postfach 324
4 CH-8157 Dielsdorf