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4.0 Operation
4.1
Operating Cycle
This product is fitted with an instrument switch which cuts off power to the control
circuit.
Connect the product to the electrical supply.
The cooling fans should automatically operate.
The furnace is fitted with a pair of gates that have a safety switch. the hearth can only
be lowered or raised if the gates are closed. The furnace is also fitted with a radiation
shield. The hearth can only be raised or lowered if this is in the open position.
Check the hearth control switch for correct operation. The spring return switch stops
the hearth in any position, but over-travel is automatically limited. Load the furnace
and raise the hearth.
Turn on the instrument switch to activate the temperature controllers. The controllers
illuminate and go through a short test cycle.
Set the over-temperature controller to a temperature a little (e.g. 15 °C) above the
maximum setpoint of program temperature, according to the instructions supplied.
The product will heat up according to the controller setpoint or program, unless a time
switch is fitted and switched off. The heat light glows brightly at first, more dimly as
the product temperature approaches a program setpoint.
Over-Temperature option only. If the over-temperature circuit has tripped, an
indicator on the over-temperature controller flashes and the heating elements are
isolated. Find and correct the cause before resetting the over-temperature controller
according to the instructions supplied.
To switch the furnace off, set the instrument switch to off. The case cooling fans
remain on and the chamber can be unloaded. Leave the fans on until the product cools
to below 300 °C. If the product is to be left off unattended, isolate it from the electrical
supply.
4.2
Emergency Stop Button
Pushing the emergency stop button will stop the hearth from moving and prevent the
elements from heating.
Once the button has been pushed, twist the emergency stop button to reset.
4.3
General Operating Advice
Heating element life is shortened by overheating. Do not leave the
product at high temperature when it is not required. The maximum
temperature is shown on the product rating label and in section 10.0
towards the back of this manual.
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