Carbolite CR SERIES Handbuch für Installation, Betrieb und Wartung - Seite 4

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Clean Room Ovens

3.0 O

PERATION

The instructions for operating the temperature controller are given in a separate manual.

If the oven is fitted with a time switch, see also the supplementary manual MS03.

If cascade control is fitted, see the supplementary manual MS07.

If the oven has variable speed fan, air extraction or stoving and curing options, please also see the

appropriate section on the next page of this manual.

3.1

Operating Cycle

The oven is fitted with a combined Supply light and Instrument switch. The light is on whenever

the oven is connected to the supply. The switch cuts off power to the controller(s).

The circulation fan operates when the instrument switch is switched on.

Connect the oven to the electrical supply. The Supply light should glow .

Operate the instrument switch to activate the temperature controller; the O position is off, the

I position on. The controller becomes illuminated and goes through a short test cycle.

Adjust the temperature controller – see the controller manual.

Overtemperature Option: If the 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 oven starts to heat up according to the controller set

point or program.

To switch the oven off, set the Instrument switch to O. If the oven is to be left off, isolate it from

the electrical supply.

3.2

Overtemperature Control (if fitted)

The overtemperature controller should typically be set at 15°C above the main controller. If an

overtemperature condition occurs, always investigate the possibility that the main control system

has failed.

An overtemperature condition always cuts off power to the heating elements. It is indicated by a

light in the overtemperature controller flashing. To reset the condition, either allow the oven to

cool, or increase the overtemperature setting, then follow the instructions in the appropriate

manual.

3.3

Explosive Vapours

The standard models are not suitable for drying or heat treatment applications where vapours are

released which are combustible or which can form explosive mixtures with air. For such

applications only use models supplied with the stoving and curing option.

3.4

Atmospheres

When an optional gas inlet is fitted there is a label near the inlet saying "INERT GAS ONLY". In

practice inert or oxidising gases may be used, but not combustible or toxic gases. The oven

chambers are not gas tight, so it should be understood that gas usage may be high, and that the

chamber is likely always to contain some air. Residual oxygen levels of 1% are to be expected.

MF21