VERDER Carbolite Gero EHA 12/450B Installation, Operation And Maintenance Instructions
E-range tube furnace no controller
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- Page 1 Installation, Operation and Maintenance Instructions 1200°C E-Range Tube Furnaces - EHA Model: 450mm No Controller EHA 12/450B + No Controller MEN-EHA12450B-005_NOCTRL 30-01-2018...
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Page 2: Table Of Contents
Contents This manual is for guidance on the use of the Carbolite Gero product specified on the front cover. This manual should be read thoroughly before unpacking and using the furnace or oven. The model details and serial number are shown on the back of this manual. - Page 3 General Maintenance 5.1.1 Cleaning Calibration After-Sales Service Recommended Spare Parts and Spare Parts Kit 6.0 Repairs and Replacements Safety Warning - Disconnection from Power Supply Safety Warning - Refractory Fibre Insulation Temperature Controller Replacement Solid-state Relay Replacement Thermocouple Replacement Element Replacement Fuse Replacement 7.0 Fault Analysis Furnace Does Not Heat Up...
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Page 4: Symbols And Warnings
1.0 Symbols and Warnings 1.0 Symbols and Warnings Switches and Lights Instrument switch: when the instrument switch is operated the temperature control circuit is energised. Heat light: the adjacent light glows or flashes to indicate that power is being supplied to the elements. Heat switch: the switch disconnects power to the heating elements;... -
Page 5: Warning Labels
1.0 Symbols and Warnings Caution – Double Pole/Neutral Fusing Warning Labels On the front control panel there are 2 warning labels as shown in Figure 1.3.1; they are numbered 7 and 8. These warnings must be followed for the safe operation of this furnace. -
Page 6: Control Box Layout And Warning Labels
1.0 Symbols and Warnings Index to numbered items in Figure 1.3.1 and 1.3.2 1. Electrical supply switch - switches electrical power ON and OFF to the furnace. 2. Heater switch - switches electrical power ON and OFF to the furnace heating elements. -
Page 7: Installation
2.0 Installation 2.0 Installation If the product has been transported or stored in humid conditions it must be dried out completely before operating the furnace. Contact Carbolite Gero Service for instructions. Unpacking and Handling When unpacking or moving the product, always lift it by its base or both ends of the main body. - Page 8 2.0 Installation Fitting the standard length work tube to furnace Tools required: 4 mm Allen key Fitting work tube is as follows with reference to Figure 2.3.2. Please note that standard length work tubes are also referred to as tubes suitable for working in air. They are 150 mm longer than the heated length of the furnace (see the Specifications table at the back of this manual).
- Page 9 2.0 Installation Reassemble the work tube end stop (5), work tube adaptor bracket (4) and tube end guard (8). Fitting the extended work tube in the furnace Tools required 4 mm Allen key. Fitting of the work tube is as follows with reference to Figure 2.3.2 2.2. Before the extended work tube can be fitted, the work tube end stops for the stand- ard length work tube (item 5 in figure 2.3.2 ) must be removed from both ends of the furnace.
- Page 10 2.0 Installation 2.3.4 Figure - Tube support assembly 2.3.5 Figure - Tube support and end seal assembly...
- Page 11 2.0 Installation 2.3.6 Figure - Tube support and end seal assembly Index to numbered items in figure 2.3.5 - 2.3.12 1. Blank plate 2. Seal 3. Clamp 4. Boss 5. Tube support collar 6. Fluted grip knob 7. Tube support bracket 8.
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Page 12: Plug Fitted
2.0 Installation 2.3.8 Figure - Cross-section view show- 2.3.7 Figure - Cross-section view show- ing extended work tube insulation plug ing standard length work tube insulation fitted plug fitted 2.3.9 Figure - Cross-section view showing an extended length work tube with a radi- ation shield fitted Electrical Connections Connection by a qualified electrician is recommended. - Page 13 2.0 Installation The external connection should be either a permanent connection to a fused isolator supply or to a socket on a fused isolator supply; the isolating switch must operate on both conductors. Make sure that the isolator switch is within easy reach of the furnace operator.
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Page 14: Temperature Controller
3.0 Temperature Controller 3.0 Temperature Controller If this product is fitted with a temperature controller, instructions are provided separately. -
Page 15: Operation
4.0 Operation 4.0 Operation Operating Cycle This product is fitted with an instrument switch which cuts off power to the control circuit. Connect the product to the electrical supply. Turn on the instrument switch to activate the temperature controller. The controller illuminates and goes through a short test cycle. -
Page 16: General Operating Advice
4.0 Operation Explosive Materials The furnace must not be used to heat materials which could explode, or which could emit gases that could form explosive mixtures. If the safe heating of a material is dependent on its temperature, only heat these type of materials if the furnace has the optional over-temperature protection device fitted. -
Page 17: Tube Life
4.0 Operation Switch off the heater switch whenever loading or unloading the product. The elements are isolated when the heater switch is OFF. This switch cuts both sides of the circuit via a contactor. Tube Life A ceramic work tube may crack if work pieces are inserted too quickly or at temperatures below 900 °C (when the tube is more brittle). -
Page 18: Maintenance
5.0 Maintenance 5.0 Maintenance General Maintenance Preventive rather than reactive maintenance is recommended. The type and frequency depends on the product use; the following are recommended. 5.1.1 Cleaning Soot deposits may form inside the furnace, depending on the process. At appropriate intervals remove these by heating as indicated in the General Operation Notes. -
Page 19: Repairs And Replacements
6.0 Repairs and Replacements 6.0 Repairs and Replacements Safety Warning - Disconnection from Power Supply Immediately switch the product off in the event of unforeseen circumstances (e.g. large amount of smoke). Allow the product to return to room temperature before inspection. Always ensure that the product is disconnected from the electrical supply before repair work is carried out. -
Page 20: Solid-State Relay Replacement
6.0 Repairs and Replacements Solid-state Relay Replacement Disconnect the product from the power supply and remove the appropriate cover as given above. Make a note of the wire connections to the solid state relay and disconnect them. Remove the solid state relay from the base panel or aluminium plate. Replace and reconnect the solid state relay ensuring that the bottom of it has good thermal contact with the base panel or aluminium plate. -
Page 21: Fuse Replacement
6.0 Repairs and Replacements Fuse Replacement Fuses are marked on the wiring diagram with type codes, e.g. F1, F2. For more information on fuses refer to section 9.0. Depending on model and voltage, the different fuse types may or may not be fitted. If any fuse has failed, it is advisable for an electrician to check the internal circuits. -
Page 22: Fault Analysis
7.0 Fault Analysis 7.0 Fault Analysis Furnace Does Not Heat Up The HEAT The heating element Check also that the SSR is working light is ON has failed correctly The controller shows a The HEAT The thermocouple has broken or has very high temperature light is OFF a wiring fault... -
Page 23: Product Overheats
7.0 Fault Analysis Product Overheats Product only heats up The controller when the instrument shows a very high The controller is faulty switch is ON temperature The thermocouple may be The controller faulty or may have been shows a low removed out of the heating temperature chamber... -
Page 24: Wiring Diagrams
8.0 Wiring Diagrams 8.0 Wiring Diagrams WA-11-30 Connections below show single phase with indirect safety switch(es). F1, F2, F3 Fuses Filter R1/1, R1/2 Relay Contactor Relay Cables Temperature Controller Blue Control Thermocouple Solid State Relay GR/Y Green + Yellow Safety Switch Grey Heat Lamp Pink... - Page 25 8.0 Wiring Diagrams WA-11-31 Connections below show single phase with safety switches and over-temperature control. F1, F2, F3 Fuses Filter R1/1, R1/2 Relay Contactor Relay Temperature Controller Cables Over-Temperature Controller Blue Over-Temperature Thermocouple Control Thermocouple GR/Y Green + Yellow Solid State Relay Grey Safety Switch Pink...
- Page 26 8.0 Wiring Diagrams WA-12-30...
- Page 27 8.0 Wiring Diagrams WA-12-31 Connections below show single phase with safety switches and over-temperature control.
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Page 28: Fuses And Power Settings
9.0 Fuses and Power Settings 9.0 Fuses and Power Settings Fuses F1 - F2: Refer to the circuit diagrams. GEC Safeclip of the type shown Fitted if supply cable fitted. Internal (glass type F up to 16 A) Supply Fitted on board to some types 38 mm x 10 mm type F fitted on Fuses of EMC filter. -
Page 29: Power Settings
9.0 Fuses and Power Settings 9.2 Power Settings The power limit settings (OP.Hi) for this model is as follows. The figures represent the maximum percentage of time that controlled power is supplied to the elements. Do not attempt to "improve performance" by setting a value higher than the one from the table. -
Page 30: Specifications
10.0 Specifications 10.0 Specifications Carbolite Gero reserves the right to change the specification without notice. EHA models - horizontal single-zone tube furnaces. All models have cylindrical elements with wire formed in the surface of the insulation material. All models can accept work tubes up to a maximum outside diameter of 60 mm. All models have a maximum operation temperature of 1200 °C (1100°C continuous). -
Page 31: Furnace Drying Out Process
10.0 Specifications Furnace drying out process Step 1. Before the furnace is connected to the electrical supply, remove the back panel and check for signs of moisture on the electrical circuits. If visible signs of moisture are present then allow it to dry out in ambient temperature for at least 24 hours. If the problem persists ensure that the furnace is isolated and contact Carbolite Gero Service for more information. - Page 33 Notes Service Record Engineer Name Date Record of Work...
- Page 34 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 Gero 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.