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Installation, Operation &
Maintenance Instructions
1700-1800°C Bottom Loading Furnaces
This manual is for the guidance of operators of the above products and
should be read before the furnace is connected to the electricity supply.
7.4
C
ONTENTS
Section
1.0
2.0
3.0
4.0
5.0
6.0
7.0
BLF 17/3 to BLF 18/21
MF23
page
2
4
6
9
9
11
13
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Summary of Contents for Carbolite BLF 17/3
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Page 1: Table Of Contents
Installation, Operation & Maintenance Instructions 1700-1800°C Bottom Loading Furnaces BLF 17/3 to BLF 18/21 This manual is for the guidance of operators of the above products and should be read before the furnace is connected to the electricity supply. ONTENTS... - Page 2 Lower/Higher Voltages (e.g. 208V,254V) Where the supply voltage is outside the operating range of the ancillary equipment, a transformer is included in the control circuit as shown. & Power Control Specifications Manuals for the furnace controller and overtemperature controller are supplied separately.
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Page 3: Symbols & Warnings
& 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 4: Installation
NSTALLATION Unpacking & Handling When unpacking or moving the furnace always lift it by its base. The furnace contains a transformer and is heavy: use two or more people to carry it. Some models may alternatively be lifted by fitting lifting bolts to captive threads in the top of the case. Remove any packing material. - Page 5 Electrical Connections Connection by a qualified electrician is recommended. The 3 litre models are designed for single phase electrical supplies with or without neutral. Larger models are designed for 3-phase use. The voltage or range of voltages on which the furnace may be operated is given on the furnace rating label.
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Page 6: Operation
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 7 Avoid burns. Carbolite can supply tongs, face masks, and heat resistant gloves. Before you remove a hot object from the furnace make sure you have a safe place to put it down.
- Page 8 Inverted Crucible Option Take special care over safety considerations: ensure that there is a safe surface on which to place the crucible when hot. If the process permits, avoid lowering the hearth when the chamber is hot. Depending on the height of the work-piece, it may be necessary to hold the crucible up in the chamber when placing the work piece on the hearth;...
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Page 9: 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, a set of elements and clips and braids. -
Page 10: Repairs & Replacements
& 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 11 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.
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Page 12: Fault Analysis
AULT NALYSIS A. Furnace Does Not Heat Up A heating element has failed The HEAT light An ohm meter applied to the element circuit shows is ON an open circuit The HEAT light The controller shows a The thermocouple has broken or has a wiring fault is OFF very high temperature... -
Page 13: Circuit Diagrams
IRCUIT IAGRAMS Single Phase GR/Y Green/Yellow temperature programmer Blue overtemperature controller Pink Grey MF23... - Page 14 Three Phase with Neutral Three Phase without neutral (Delta) MF23...
- Page 15 Filter (if fitted) Lower/Higher Voltages (e.g. 208V,254V) Where the supply voltage is outside the operating range of the ancillary equipment, a transformer is included in the control circuit as shown. transformer Supply light & Instrument Switch MF23...
- Page 16 TABLE OF FUSE AND CURRENT LIMIT VALUES Model Phases volts supply fuse thyristor current rating type fuse limit rating (element circuit) BLF 17/3 1-phase 220-240V 30-32A NS32 BLF 18/3 1-phase 220-240V 30-32A NS32 150A BLF 17/8 3-phase+N 380/220-415/240V glass BLF 17/8...
- Page 17 Thank you for reading this data sheet. Please contact us for a quotation: Head Office (UK) Switzerland Office P.O. Box 2124 Zugerstrasse 46 Chelmsford 6314 Unterägeri Essex CM1 3UP England Switzerland Tel: +44 (0)1245 600 560 Tel: +41 41 541 5877 Fax: +44 (0)1245 600 030 Fax: +41 41 541 5878 Email:...