MMI 962.1 Gas burner automatic safety control

MMI 962.1 Gas burner automatic safety control
A Honeywell Company
MMI 962.1
Gas burner automatic
safety control
For power gas burners
Terminals for air damper motor
Built-in remote reset for lock-outs
Possible flame detectors:
- Ionization probe
- Infrared flicker detector
INTRODUCTION
The gas burner automatic safety control MMI 962.1 controls
and monitors blown gas- and combined burners of any
nominal thermal load (tested and certified according to
EN 298).
If an air damper unit is connected, a 2-stage operation with
two fuel valves or a modulating operation with one fuel valve
is possible.
Various types and model designations differentiate the
automatic safety controls with respect to the programme
times, as well as with regard to differing national standards.
The control box type MMI 962.1 Mod. 23 can be used
instead of the types MMI 812 Mod. 23 or MMI 812.1
Mod. 23.
TECHNICAL DATA
Operating voltage
220 / 240 V (-15... +10%)
50 Hz
Results in a proportional
deviation of the time
max. 10 A rapid, 6 A slow
10 VA
Differing frequency
Rating fuse
Power consumption
Max. load per output:
- term. 3
- term. 4, B
- term. 5, 6, C
total load
Amplifier sensitivity
Minimum required
Ionization current
Flame detector cable
Air pressure monitor
Waiting time for
malfunction remedy
Flame detector
- Ionization probe
- Infrared flicker detector
Weight, incl. base
Mounting position
Insulation standard
Admissible ambient
temperature for controller
and flame detector
Classified acc. to EN 298
CONSTRUCTIONAL FEATURES
The automatic control is housed in a non-inflammable,
transparent, plug-in type plastic case and contains:
– Synchronous motor with speed reducer gears as the
drive for the switching cam
– Switching cam with informative programme display in
colour
– 12 times cam assembly for controlling the programme
sequence
– Plug-in type circuit boards with the electronic components
The following important indicating - and operating elements
are located on the front panel of the automatic control:
– Illuminated pushbutton for indication of malfunctions
and reset
– Programme display in colour
– Screw for central mounting
2A, cos ϕ 0.2
2A, cos ϕ 0.4
1A, cos ϕ 0.4
5A, cos ϕ 0.4
1 µA
5 µA
max. 20 m cable length
working contact 4 A, 230 V
None
IRD 1020
350 g
any
IP 44
-20° C… +60° C
BTLLXN
program timings (sec.)
MMI 962.1
Model
0708.20-01-e/04/99
Waiting time at start-up
Max. reaction time for air
proving switch
Pre-purge time
LK open signal
Pre-ignition time
Total ignition time
Safety time
Time delay term.6 / term.C
1
23
tw
8
tlw
tv1
tlk
tvz
tz
ts
tv2
15
30
38
3
6.6
3
8
APPLICATION TECHNOLOGY FEATURES
COMMISSIONING AND SERVICE/MAINTENANCE
1. Flame Monitoring
1. Important Remarks
– Before commissioning, the wiring has to be accurately
checked. Faulty wiring can damage the unit and endanger
the safety of the installation.
– The mains fuse has to be selected so that the limit values
indicated under "Technical Specifications" are under no
circumstances exceeded. Non-compliance with this
regulation can have very serious consequences for the
control unit and for the installation in the case of a shortcircuit.
– For safety reasons, at least one control shut-down per
24 hours must be assured.
– The control unit must be plugged-in or -out only when the
mains supply has been disconnected.
– Automatic burner safety controls are safety devices and
must not be opened.
The flame monitoring can be effected with the following
flame detectors:
– With ionization electrodes in power grids with earthed
neutral conductor, utilizable with gas burners (interference
effects of the ignition spark cannot influence the formation
of the flame signal).
– With infrared flicker detector type IRD 1020 for all types
of burners. (siehe Dok. 746)
2. Burner Control
– The burner controls MMI 962.1 features a low-voltage
–
–
–
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".
3. Safety
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
With respect to design and programme sequence, the gas
burner automatic safety controls of the MMI 962 type range
comply with the currently applicable European standards
and regulations.
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.
4. Mounting and Electrical Installation
Wiring 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 (PG11
thread) plus 2 knock out holes in the base bottom faciliate
the base wiring
Automatic control switches to fault condition during the prepurging (blue zone):
– Air pressure monitor contact open
– Flame signal (stray light)
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).
General:
– Mounting position as required, insulation standard IP 44
(splash-proof). The automatic control and sensor should,
however, not be exposed to excessive vibration.
– During mounting and installation, the applicable regulations for installation have to be observed.
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.
Remote reset for lock-outs:
– For the external reset, a temporary switch (push-button
switch) has to be wired between terminals A and Mp.
– The terminal A can be broke-off if not used.
2
MMI 962.1
–
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 automatic burner controls MMI only operates when
a load is connected to terminal 5. If the fuel valve is
interrupted by an external contact during the pre-purging
phase, a resistance of max. 22 kW, 4 Watt has to be
applied bet-ween the terminals 5 and 8.
Functional test of the air pressure monitor before the
startup and monitoring of the air pressure during the prepurging time, as well as in the operating condition of the
burner. For normal applications a working contact with a
power rating of 4 A / 230 V is sufficient.
In the case of the automatic control MMI 962.1, contacts
can be installed between the terminals 1 and 9 (e.g., valve
limit position contacts). These are checked for their
correct closing position when the unit is started up. The
connection 1-9 has to be closed during the starting
phase of the auto-matic control.
No fuel valve must be connected to terminal 6.
SCHEMATIC CONNECTION DIAGRAM AND PROCESS DIAGRAM MMI 962.1
Ph
1
2
3
GW
HS
max. 10 A rapid
6 A slow
4
5
6
ST
C
RT
B
7
A
8
9
LW
IS
Z
M
V1
L
SA
R
N
tw tlw tv1 tlk tvz tz ts tv2
IRD CONNECTION
IRD
1020
blue
term. 8
black
term. 2
brown
term. 9
MMI 962.1
SCHEMATIC DIAGRAM MMI 962.1
3
HS
GW
ST
RT
IS
Z
M
V1
L
LW
SA
R
Mains switch
Gas pressure switch
Limit thermostat
Control thermostat
Ionization probe
Ignition
Burner motor
Solenoid valve 1st stage
Air damper unit
Air pressure monitor
External fault indication
Remote reset temporary switch
tw
tlw
Waiting time at start-up
Max. reaction time
for air proving switch
Pre-purge time
LK open signal
Pre-ignition time
Total ignition time
Safety time
Time delay term. 6 / term. C
tv1
tlk
tvz
tz
ts
tv2
MMI WITH BASE
5
MEASUREMENT OF THE FLAME SIGNAL
E
2
67
MMI 962.1
91
PG 11
24
+
The Satronic Ionimeter
is ideal for making
this measurement.
30
16
30
M4
30
57-60
ø 16 mm,
cable entry from below
IRD 1020
HOLDER M 93
3
ø13.5
21.8
35
44
50
29
14
4.5
26
35
44
24
Earth
The signal should
be higher than 5 µA
0 - 10 µA
0 - 100 µA
Slide-in plate
Reset button
25
16
-
61
87
104
15.1
17 4
48
ø20.5
ORDERING INFORMATION
ITEM
DESIGNATION
ITEM NO.
Control unit
Socket
Multiwire base
Slide-in plate
optionally
Flame detector
Flame detector
Flame detector
IRD mounting flange
Flame detector cable
Type MMI 962.1 mod. 23
Wiring base S 98
Wiring base MW 880 ABC
PG-plate
Cable clamping plate
IRD 1020 end-on viewing
IRD 1020 side-on left
IRD 1020 side-on right
Mounting flange M 93 for IRD 1020
3-wire, 0.6 m
06256
75310
74001
70502
70501
16522
16523
16521
59093
7236001
The above ordering information refers to the standard version.
Special versions are also included in our product range.
MMI 962.1
Specifications subject to change without notice.
A Honeywell Company
4
Satronic AG
Honeywell-Platz 1
Postfach 324
CH-8157 Dielsdorf
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