Operation - Carbolite E Series Installation, Operation & Maintenance Instructions Manual

E range
3

OPERATION

The instructions for operating the temperature controller are given in a separate manual. If the
furnace is fitted with a time switch, see also the supplementary manual MS03. If cascade control
is fitted, see the supplementary manual MS07.
3.1 Before Operating the Furnace
For the safe operation of this furnace the following warnings must be followed:
Explosive Materials
The furnace must not be used to heat materials which could explode, or which could emit gases
that could form explosive mixtures.
If the safe heating of a material is dependent on its temperature then only heat these type of
materials if the furnace has the optional over-temperature protection device fitted, even then
ensure that the over-temperature device is calibrated and set to an over temperature safety limit
that is sufficiently large as to avoid any hazards, if in doubt then seek expert advice. Customers
are responsible for carrying out their own risk assessments on the heating of materials.
Do not operate without a work tube. The furnace must not be operated without the correctly
sized work tube for the furnace which has the matching correctly sized work tube adaptors or it
could be possible to for an operator to access electrically live element coils that could cause
serious injury of death.
Switch off the furnace before loading and unloading. The furnace heaters must be switched off
using the heater switch item 2 in Figure 1-1 page 3 when the furnace is being loaded or unloaded.
This is because the work tube can become electrically conductive at high temperatures, presenting
a possible hazard to an operator that could cause serious injury or death if an element failed and
collapsed onto a work tube and was not detected.
3.2 Operating cycle
The furnace is fitted with an instrument switch. The switch cuts off power to the control circuit.
There is also a Heater switch that can be used to disconnect power to the elements.
Connect the furnace to the electrical supply.
Operate the instrument switch to activate the temperature controller. The controller becomes
illuminated and goes through a short test cycle.
Single zone models, EHA and EVA: Set the temperature controller to the desired set point or
program - see the controller manual.
3-zone models, EHC and EVC, with control methods A & B: Set the slave (end zone) controllers to
the desired offset temperature, usually zero. Set the main (central) temperature controller to the
desired set point or program. See section 3.3 and/or the separate manual(s) for the controller(s).
3-zone models, EHC and EVC, with control method C: Set the three controllers to the desired
temperatures. See the separate manual(s) for the controller(s).
Over-temperature option only. If the over-temperature controller has not yet been set as required,
set it and activate it according to the instructions in the controller manual.
Switch on the Heater switch, located on the instrument panel. Unless a time switch is fitted and is
off, the furnace starts to heat up. The Heat light(s) glow steadily at first and then flash as the
furnace approaches the desired temperature or a program set point.
Over-temperature option only. If the over-temperature trip operates then an indicator in the over-
temperature controller flashes and the heating elements are isolated. Find and correct the cause
before resetting the over-temperature controller according the instructions supplied.
16 MF65-1.01