Carbolite 3216OT - Manual (Page 5)

Basic Operation
5 MC21 – 1.00
2 Basic Operating Instructions
2.1 Furnace or Oven Controls
Most Carbolite products are fitted with an “Instrument Switch” which cuts off power to the
controller and other parts of the control circuit. See the instruction manual for the furnace or
oven for the overall operating instructions.
To operate the 3216OT there must be power to the furnace or oven, and the Instrument
switch must be on. If a time switch is included in the furnace or oven circuit, this must be in
an On period.
When an over-temperature condition occurs, the controller cuts the power to a contactor,
which in turn cuts power to the heating elements. Power is not restored until the controller is
“reset”. Other components do not generally have power to them cut on over-temperature;
oven fans usually remain running, but may not do so if other options (such as a door switch)
are fitted.
2.2 The 3216OT Operation
When switched on, the controller lights up, goes through a short test routine, and then
displays the measured temperature or the over-temperature setpoint.
The Page key  allows access to parameter lists within the controller; most lists and
parameters are hidden and cannot be accessed by the operator because they contain
factory-set parameters which should not be changed.
A single press of the page key  displays the temperature units, normally set to °C; further
presses reveal the lists indicated in the Navigation Diagram in section 4.
The Scroll key  allows access to the parameters within a list. Some parameters are
display-only; others may be altered by the operator.
A single press of the scroll key  in the Home list displays the temperature units; further
presses reveal the parameters in the current list indicated in the Navigation Diagram.
To return to the Home list at any time, press Page  and Scroll  together, or wait for 45
seconds.
The Down  and Up  keys are used to alter the setpoint or other parameter values.
2.3 Basic Operation
Use Down  and Up  to alter the over-temperature setpoint. This should normally be set
a little above the maximum working temperature (say 15°C above). The unit is supplied at
15°C above the furnace or oven maximum working temperature.
Press Scroll  to view the present temperature as seen by the over-temperature controller.
Press it twice, because the first press shows the temperature units (°C).