Installation, Operation & Maintenance Instructions 1100°C Chamber Furnaces ELF models 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. Contents Section Page 1.0 Introduction 2 2.0 Installation 3 3.0 Operation 4 4.0 Maintenance 6 5.0 Repairs & Replacements 7 6.0 Fault Analysis 10 7.0 6L & 14L Circuit Diagram and Fuses 11 8.0 23L Circuit Diagram & Fuses 12 10.0 Fuses 14 11.
ELF (B) 1.0 INTRODUCTION 1.1 Models Covered by this Manual This manual covers the Carbolite furnace models ELF 11/6B, ELF 11/14B and ELF 11/23B. The B suffix indicates differences from earlier models, in particular that the heating element is enclosed in an inner metal chamber, and the heating wires are partly exposed in the chamber sides and radiate freely into the chamber. The B models were not made before mid-2001.
ELF (B) 2.0 INSTALLATION 2.1 Unpacking & Handling When unpacking or handling the furnace always lift it by its base. Never lift it by the door. Use two people to unpack and carry the furnace. Carefully remove any packing material from the furnace chamber. Avoid damaging the surrounding insulation when removing packing materials.
ELF (B) Amps: the actual supply must be capable of supplying the required amps. It should be fused at the next available fuse size equal to or greater than the amps on the rating label. A supply cable is fitted to 200-240V models, but may not be to 110-120V models. If there is no cable, remove the back panel and connect a suitably rated cable to the internal terminals. Either wire the supply cable directly to an isolator or fit it with a line plug.
ELF (B) Light weight ceramic fibre insulation can easily be marked by accidental contact. Some fine cracks may be visible on the surface of the insulation, or may develop in the surface of the chamber due to the progressive shrinkage of the insulation materials. Cracks are not usually detrimental to the functioning or the safety of the furnace. 3.3 Use of Probes Any metal object used to probe into the furnace chamber while the furnace is connected to the supply must be earthed (grounded).
ELF (B) 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 Soot deposits may form inside the furnace, depending on the process. At appropriate intervals remove these by heating as indicated in section 3.2. The furnace outer surface may be cleaned with a damp cloth. Do not allow water to enter the interior of the case or chamber.
ELF (B) 5.0 REPAIRS & REPLACEMENTS 5.1 Safety Warning – Disconnection from Supply Always ensure that the furnace is disconnected from the supply before repair work is carried out. 5.2 Safety Warning - Refractory Fibrous Insulation Insulation made from High Temperature Insulation Wool Refractory Ceramic Fibre, (better described as Alumino Silicate Wool) (ASW) This product contains alumino silicate wool products in its thermal insulation.
ELF (B) 5.5 Thermocouple Replacement Disconnect the furnace from the supply, and remove the furnace back panel. Make a note of the thermocouple connections. The negative leg of the thermocouple is marked blue. Compensating cable colour codings are: negative: positive (type K): white green Disconnect the thermocouple from its terminal block and withdraw the thermocouple from its sheath. It is advisable also to remove the sheath and shake out any broken pieces of thermocouple.
ELF (B) Door Plug Replacement The “door plug” is also known as the “door insulation piece”. Lower the furnace door to the fully open position. Loosen the four M6 Screws, two on either side of the door plug carrier. Remove the door plug and carrier Remove the air inlet blanking plate screws (section 5.7). Slide the door plug upwards out of the carrier. Slide the new door plug into the carrier ensuring that the air inlet holes are aligned, and reassemble in the reverse order.
ELF (B) 6.0 FAULT ANALYSIS A. Furnace Does Not Heat Up 1. The HEAT light The heating element has failed is ON 2. The HEAT light is OFF Check also that the SSR is working correctly The controller shows a very high temperature or a code such as S.
ELF (B) 7.0 ELF 6L & 14L CIRCUIT DIAGRAM AND FUSES 7.1 200-240V models NOTE – models before mid-2002: two door switches were fitted directly in the element circuit, instead of a single switch and contactor. the EMC filter and fuses are integrated onto a circuit board. F1 EMC Filter N L contactor or relay F2 PE Instrument Switch heat on coil door switch e l e m e n t (s) if fitted overtemp. controller thermocouple SSR temperature controller thermocouple 7.
ELF (B) 8.1 200-240V models the EMC filter and fuses are integrated onto a circuit board. N L F1 F2 contactor or relay PE e l e m e n t (s) heat on coil door switch overtemp. controller e l e m e n t (s) if fitted thermocouple SSR temperature controller thermocouple 104 - 120V models the EMC filter and fuses are integrated onto a circuit board. N L F1 contactor or relay F2 e l e heat m on e n t (s) Instrument Switch coil door switch overtemp.
ELF (B) Fuses 8.2 Fuses are marked on the circuit diagram (above) with type codes, e.g. F1, F2. A list of the correct fuses is tabled below. If any fuse has failed, it is advisable for an electrician to check the internal circuits. Replace any failed fuses with the correct type. For safety reasons do not fit larger capacity fuses without first consulting Carbolite. The fuses are near the cable entry point, and access is by removal of the back panel. The fuses are mounted on an EMC filter circuit board.
ELF (B) 9.0 SPECIFICATIONS Carbolite reserves the right to change specifications without notice. 9.1 Models Covered by this Manual MODEL Max. Chamber Size Approx. Net Power (mm) Capacity Weight (°C) (kW) H W D (l) (kg) Chamber furnaces heated by coiled resistance wire embedded in light weight ceramic fibre forming the furnace chamber. ELF 11/6B 1100°C 2 160 180 205 5.9 24 ELF 11/14B 1100°C 2.6 200 220 315 13.8 31 ELF 11/23B 1100°C 5 715 506 660 23 52 9.2 Max.
ELF (B) MF01 3.
The products covered in this manual are only a small part of the wide range of ovens, chamber furnaces and tube furnaces manufactured by Carbolite for laboratory and industrial use. For further details of our standard or custom built products please contact us at the address below, or ask your nearest stockist.
