Page 1: Table Of Contents
Installation, Operation & Maintenance Instructions 1700-1800°C Chamber Furnaces types RHF, HTF & HTC This manual is for the guidance of operators of the above Carbolite products and should be read before the furnace is connected to the electricity supply. ONTENTS Section page Symbols &...
Page 2: Symbols & Warnings
1700-1800° Chamber & W YMBOLS ARNINGS Switches and Lights Supply Light: when the furnace is connected to the electrical supply the light in the adjacent switch glows Heat Light: the adjacent light glows or flashes to indicate that power is being supplied to the elements Warning Symbols DANGER of electrical shock–...
Page 3: Installation
1 set Separators/Blocks Chimney unit Remove the top access panel to allow element fitting. In the case of RHF 17/3, the whole top cover. Fit the heating elements vertically into the chamber. Handle the elements with great care. The installation of these elements is described in section 5.6. Connect the aluminium braids securely as indicated in the element installation instructions.
Page 4 1700-1800° Chamber Electrical Connections Connection by a qualified electrician is recommended. The smaller models are designed only for single phase electrical supplies with or without neutral. The larger models are for 3-phase use, but can also be supplied for single phase. The furnace must be connected only to the type and voltage of supply for which it was ordered.
Page 5: Operation
1700-1800° Chamber PERATION 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. Operating Cycle The furnace is fitted with a combined Supply light and Instrument switch.
Page 6 The programmer is used in conjunction with a phase angle thyristor Eurocube, which incorporates a current limit potentiometer preset by Carbolite. The models designed for 3-phase use have three of these thyristors. The elements are connected in series across the low voltage output of a transformer housed in the furnace case.
Page 7 1700-1800° Chamber Thermocouples - Warning The output from 1700-1800°C thermocouples when used regularly at temperatures greater than 1650°C can deteriorate and decrease with age. Customers are advised periodically to check the thermocouple output, either by a calibration test, or by comparing the output with a new reference thermocouple which has been subjected to high temperatures for a minimum length of time.
Page 8: Maintenance
To contact Thermal Engineering Services or Carbolite see the back page of this manual. 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 thermocouple, one sheath, one power thyristor, one door insulation piece, and a set of elements, clips and braids.
Page 9: Repairs & Replacements
1700-1800° Chamber & R EPAIRS EPLACEMENTS Safety Warning – Disconnection from Supply Always ensure that the furnace is disconnected from the supply before repair work is carried out. Safety Warning - Refractory Fibrous Insulation This furnace contains refractory fibres in its thermal insulation. These materials may be in the form of fibre blanket or felt, vacuum formed board or shapes, mineral wool slab or loose fill fibre.
Page 10 1700-1800° Chamber Element Installation & Replacement Safety Warning – Molybdenum Disilicide elements. The elements form a glazed surface when heated. Internal stresses can form through heating and cooling which render the glaze fragile. The glaze can sometimes splinter into a shower of sharp particles when handled. Always wear eye protection when handling the elements.
Page 11 Use of Clip Tool larger clips require clip tool, comprising two levers smaller clips do no require clip tool Element Data - distance from top of element clamp to top of element RHF 17/3 RHF 17/10 32mm RHF 17/25 HTF 18/3...
Page 12: Fault Analysis
1700-1800° Chamber AULT NALYSIS A. Furnace Does Not Heat Up A heating element has failed An ohm meter applied to The HEAT light the element circuit shows is ON an open circuit The thermocouple has broken The HEAT light The controller shows a or has a wiring fault is OFF very high temperature...
Page 13: Circuit Diagram
1700-1800° Chamber IRCUIT IAGRAM Single Phase Example - Manual Door & Electric Door Versions GR/Y Green/Yellow temperature programmer Blue overtemperature controller Pink Grey notes: 1. Autowound element transformer shown; an isolating transformer may be fitted. 2. Door actuator circuits may differ from the example shown. Three-Phase Models Each set (pair) of elements has its own transformer, controlled by a thyristor complete with thyristor fuse.
Page 14 1700-1800° Chamber MF22...
Page 15: Fuses & Power Control
TABLE OF FUSE AND CURRENT LIMIT VALUES Model Phases volts supply fuse thyristor current rating type fuse limit rating (element circuit) RHF 17/3 1-phase 208, 220-240 NS20 RHF 17/10 1-phase 208, 220-240 ES40 RHF 17/25 3-phase + N 380/220-415/240 NS25 150A RHF 17/25...
Page 16: Specifications
Thank you for reading this data sheet. For pricing or for further information, please contact us at our UK Office, using the details below. UK Office Keison Products, P.O. Box 2124, Chelmsford, Essex, CM1 3UP, England. Tel: +44 (0)330 088 0560 Fax: +44 (0)1245 808399 Email: sales@keison.co.uk...

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