5.0
Operation
5.1
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.
Turn on the instrument switch to activate the temperature controllers. The controllers
illuminate and go through a short test cycle.
In these products the instrument switch does not cut power to the fan.
The fan is on whenever the product is connected to the electrical supply.
Where the fan is operated by the instrument switch, it does not switch
off unless the product temperature is below 100 °C (to initiate cooling,
lower the controller setpoint). Failure to observe this may reduce the fan
motor life.
Over-Temperature option only
. If the digital over-temperature option has not yet
been set as required, set and activate it according to the over-temperature controller
instructions.
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 steadily at first and then flashes as the product approaches the
desired temperature or 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 turn the product off, set the instrument switch to its off position. The controller
display will go blank. If the product is to be left unattended, isolate it from the electrical
supply.
5.2
General Operating Notes
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 11.0
towards the back of this manual.
When heating large objects, in particular poor conductors, avoid shielding the
thermocouple from the heating elements. The thermocouple is intended to sense the
temperature near the heating elements. However, if a large object is placed in the
chamber it may record the average temperature of the object and the elements, this
can lead to overheating of the elements. Allow large objects to gain heat at a lower
temperature and then reset the controller to a temperature close to the desired
13
5.0 Operation
Summary of Contents for CARBOLITE GERO HRF 7/45
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