Carbolite TVS Series User Manual download pdf (Page 8)

HZS, TVS

8 MF24 – 3.44

temperatures only up to 600°C try a power limit of 50%. Control stability may fall off again if a

setting below about 40% is used.

Before changing the power limit, record its factory setting for possible future use.

4.0 MAINTENANCE

4.1 General Maintenance

Preventive rather than reactive maintenance is to be preferred. The type and frequency depends on

furnace use: the following are recommended.

4.1.1 Cleaning

Check the furnace interior. If soot deposits have formed, remove by heating up to maximum

temperature for one hour without load.

The furnace outer surface may be cleaned with a damp cloth. Do not allow water to enter the

interior of the case or chamber. Do not clean with organic solvents.

4.1.2 Safety Switch

The safety switch operation mentioned in 3.3 should be checked periodically to ensure that heating

elements are isolated when the furnace is opened. In normal conditions the safety arrangement

should outlast the furnace, but it could be affected by rough handling, a corrosive environment or

work materials, or exceptional frequency of use.

A qualified electrician should check that the supply to the heating elements is cut, with and

without power being on, when the furnace is open partially and fully; it is important that isolation

is not just marginally achieved. The check is best made on the element terminals after removal of

the covers: probing the element surface inside the furnace could be inconclusive because of surface

oxidation. Note that all live supply wires of a 3-phase supply, and both live and neutral of a 1-

phase supply, should be isolated when the door is opened.

4.2 Calibration

After prolonged use the controller and/or thermocouple could require recalibration. This would be

important for processes which require accurate temperature readings or which use the furnace

close to its maximum temperature. A quick check using an independent thermocouple and

temperature indicator should be made from time to time to determine whether full calibration is

required. These items can be supplied by Carbolite.

Depending on the controller, the controller manual may contain calibration instructions.

4.3 After Sales Service

Carbolite’s service division (Carbolite Engineering Services) has a team of Service Engineers

capable of repair, calibration and preventive maintenance of furnace and oven products at our

customers’ premises throughout the world. We also sell spares by mail order. A telephone call or

fax often enables a fault to be diagnosed and the necessary spare part despatched.

Each furnace has its own record card at Carbolite. In all correspondence please quote the serial

number, model type and voltage given on the rating label of the furnace. The serial number and

model type are also given on the front of this booklet when supplied with a furnace.

To contact Carbolite Engineering Services or Carbolite see the back page of this manual.

4.4 Recommended Spares Kits

Carbolite can supply individual spares, or a kit of the items most likely to be required. Ordering a

kit in advance can save time in the event of a breakdown. Each kit comprises one of each type of

thermocouple, one solid state relay, and two heating elements (models /900: 2 of each type).

When ordering spares please quote the model details as requested above.

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Carbolite TVS Series User Manual Page 8

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