Carbolite CF 15 - CF 60 User Manual download pdf (Page 6)

6 MF28 3.08

3.0 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.

3.1 Operating Cycle

The furnace is fitted with an Instrument switch. The switch cuts off power to the controller(s) and

heating elements (via a contactor).

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.

Close the furnace door and adjust the temperature controller (see controller manual).

Set the element overtemperature controller to approximately 100°C above the maximum or set-

point temperature. The element overtemperature controller does not trip the furnace when

activated, and when once correctly set may be ignored (see also section 3.5).

Chamber overtemperature option only. If the chamber overtemperature controller has not yet been

set as required, set it and activate it according to the instructions in the appropriate manual.

Unless a time switch is fitted and is off, the furnace starts to heat up. The Heat lights glow steadily

at first and then flash as the furnace approaches the desired temperature or a program setpoint.

Chamber overtemperature option only. If the overtemperature trip operates then an indicator in the

overtemperature controller flashes, and the heating elements are isolated. Find and correct the

cause before resetting the overtemperature controller according the instructions in the appropriate

manual.

To turn the furnace off, set the Instrument switch to it’s off position; the controller display will go

blank. If the furnace is to be left off unattended, isolate it the electrical supply.

3.2 Instrument Layout

The controllers are normally laid out as follows, although this may vary:

1 = Controller/Programmer 3 = Chamber Overtemperature Controller (if fitted)

2 = Element Overtemperature Controller 4 = Time Switch (if fitted)

3.3 General Operating Advice

Heating element life is shortened by use at temperatures close to maximum. Do not leave the

furnace at high temperature when not required.

Clean up any spillages in the chamber; these contaminate the brickwork.

Lightweight ceramic fibre insulation can easily be marked by accidental contact. Some fine cracks

may be visible on the surface of the insulation, or may develop in the surface of the chamber due

to the progressive shrinkage of the insulation materials. Cracks are not usually detrimental to the

functioning or the safety of the furnace.

3.4 Operator Safety

The furnace incorporates a safety switch which interrupts the heating element circuit when the

door is opened. This prevents the user touching a live heating element, but also prevents the

furnace from heating up if the door is left open. The operation of this switch should be checked

periodically – see section 4.1.2.

1,3

If controller is 301

If controller is 3216 or 3508

1 2 3 4 5 6 7 8 9 10 11 ... 19 20

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Carbolite CF 15 - CF 60 User Manual Page 6

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