Despatch LEB Series - Manual (Page 60)

52
Timer Option with Audible and Visual
Alarm
This option sounds the alarm and a light comes on when the timer times out.
Turning the heater switch off will clear the alarm condition. Do not turn the heater
switch on before resetting the timer.
Turning the timer switch off will also clear the alarm condition but the heater will remain
on.
Wiring for this option is shown in the DRAWINGS section of this manual.
High Limit Alarm Option
This option sounds the alarm and a light comes on when a high limit condition occurs.
To silence the alarm horn, press the alarm silence switch; the light will remain on.
It is necessary to clear the high limit condition to clear the alarm. See the
TROUBLESHOOTING section of this manual for solutions for high limit conditions.
It will be necessary to reset the high limit instrument whenever it has tripped. The high
limit instrument may be reset by first allowing the oven chamber to cool slightly (or by
setting the high limit instrument up several degrees), then pushing the black reset
button.
The wiring for this option is shown on the electrical schematic in the DRAWINGS
section of this manual.
Recorder Option
The circular chart recorder is used to record the user’s process. This is done by an
independent thermocouple. The charts used are 24 hour or 7 day. See the recorder
manufacturer’s manual supplied with this manual.
The wiring for this option is shown on the electrical schematic in the drawing section of
this manual.