Cylinder- / Band Heaters MICA-type

Installation

During installation, care must be taken to avoid deformation or excessive spreading of the heating element. Difficult installation conditions should be taken into account at the design stage. The heating elements must only be operated with a suitable temperature control system.

The cylinder- / band heater must be clamped onto the cylinder to be heated in a form-fitting manner, ensuring that the heater and the surface to be heated are firmly connected. A maximum torque is therefore recommended. When using disc springs, a torque of 8.5 Nm should be maintained. Mechanical damage caused by external influences must also be avoided under all circumstances.

The heating element must not be put into operation until assembly is complete. During initial commissioning, until the operating temperature is reached, the secure fastening of the heating element must be checked at regular intervals. If necessary, the clamping screws must be retightened between 3 and 3.5 Nm. During the initial heating phase, the cylindrical ring heater must be retightened. For heaters with compression springs, only pre-tension them to the extent that sufficient duty stroke is available.

Caution: As heat transfer is intended to occur through direct contact between the cylindrical ring heater and the cylinder to be heated, the cylinder may be damaged by overheating if the connection between the cylinder- / band heater and the cylinder is not a positive fit.

Storage

The heating element must be stored in a dry, dust-free environment. Micanite materials are hygroscopic; therefore, if stored in conditions that are too humid, the insulating material may absorb moisture, resulting in a risk of short-circuiting. It is recommended to heat the element up slowly after prolonged storage or when putting it into service for the first time.

The electrical connection must only be carried out by an authorised electrician or by suitably trained technical staff.

Ensure that the operating voltage of the heater matches the supply voltage. All connections must be made using heat-resistant cable (see operating conditions and safety instructions). These must be routed such that they do not come into contact with sharp-edged metal parts or surfaces that radiate heat.

Note: The user must ensure that the electrical connection is protected against accidental contact.

The maximum operating temperature for the RHK cylinder heaters is 300 °C. For cylinder heaters in the RHKS series, the maximum permissible operating temperature is 400 °C. Please note that the relevant fire safety regulations must be followed and appropriate safety precautions must be taken. No critical conditions are permitted either on the cylinder heating element or in the material to be heated (such as fire, explosion, smoke or gas development, etc.).

Due to the high temperatures, only a suitable temperature-resistant connection cable must be used. Care must also be taken to ensure adequate protection against contact, dust and moisture.

The maximum surface load on the heating elements of the RHK series should not exceed 3.5 W/cm². For the RHKS series, a surface load of 6 W/cm² should not be exceeded. Incorrect installation and the wrong choice of control system can lead to faults and accidents. Any use for purposes other than those intended or under deviating operating conditions requires the manufacturer’s written approval; otherwise, no warranty or liability will be accepted.

Caution: To prevent overheating of the RHKS series cylinder heaters, they must be operated with a ramp-up control!

Where applicable, the product has been manufactured in accordance with the following standards:

• DIN-EN 60335-1

• VDE 0700 section 1