FLAME FAILURE & SEQUENCE CONTROL – Satronic TMO 720-4 Burner Control
The unit is designed to provide control and supervision for atomising oil burners of medium to large
capacity.
For safety reasons, at least one controlled shutdown must be provided within each 24-hour period of
continuous operation.
TMO 720
Loss of flame during operation results in immediate cancellation of fuel release, followed by direct lockout
or repeat of start sequence if jumper 11 has been cut.
Start without flame establishment causes cancellation of fuel release within 5 seconds of its initial release.
Fuel is supplied only when all parts of the unit are functioning correctly. All safety circuits are
automatically checked before fuel is released.
Failure of the mains supply always results in a normal start sequence on restoration of power. if the control
box is at lockout, failure of the mains supply does not cause it to reset.
Stray light during the pre-purge phase leads to shutdown and lockout.
COLOUR WHERE WHAT
REASON
Incorrect wiring
No voltage at terminal 9
GREEN
End
Does not start
No neutral connections
Stray light
Photocell faulty
Solenoid leaking
BLUE
Anywhere Lockout
Flame monitoring circuit broken
No ignition
Fuel supply problem
YELLOW
(NO
FLAME)
End Lockout
Solenoid valve defective
Photocell dirty
Photocell or circuit faulty
YELLOW
(WITH
FLAME)
End Locknut
No voltage at terminal 20
When a burner failure is encountered the box goes into lockout mode. This is indicated by a red light,
which displays within the lockout window of the control and is repeated at the lockout lamp on the panel
facia.
If a lockout situation occurs, the burner will not start until it is manually reset by pressing the lockout
window on the control. (The control can also be reset by the off/on/reset switch situated on the control
panel facia).
If the burner fails to fire and persists in locking out,
no more than three attempts should be made
. To do
so may create a
dangerous situation
.
When lockout occurs, the control can be reset immediately. After the resetting (and also after the
correction of a fault which resulted in a controlled shutdown, or after a mains failure) the sequence switch
always runs through to the start position, whereby
only
selected terminals receive voltage in accordance
with the control program. it is only then that the control unit programs a fresh burner start-up.
Note:
Do not press the lockout reset button (or remote reset switch) for more than 10 seconds.
PLEASE NOTE
When the control box goes to lockout it is generally performing the function it is designed for.
MOL 3400-4100 Issue 2 10/08
Page 30
Summary of Contents for MOL 3400-410
Page 18: ...MOL 3400 4100 Issue 2 10 08 Page 17 MODULATING UNIT Cams shown in the Low Flame Position...
Page 35: ...NOTES...
Page 36: ...NOTES...
