Table of Contents
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Installation, Operation &
Maintenance Instructions
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.
C
Section
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
This manual should supply all the information required for safe and trouble-
free furnace operation. Information on controller operation is included.
1.0
1100°C Chamber Furnaces
ELF models
ONTENTS
Specifications
MF01 - 3.20
page
1
2
5
7
13
14
14
19
20
21
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Summary of Contents for Carbolite ELF Series
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Page 1: Table Of Contents
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. ONTENTS Section page Introduction... -
Page 2: Introduction
NTRODUCTION Models Covered by this Manual This manual covers the Carbolite furnace models ELF 11/6B and ELF 11/14B. 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. -
Page 3: Installation
ELF (B) NSTALLATION 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. - Page 4 ELF (B) Electrical Connections Connection by a qualified electrician is recommended. The furnace requires a single-phase A.C. supply with earth (ground), which may be Live to Neutral non-reversible (polarised), Live to Neutral reversible (non-polarised), or Live to Live. Check the following before connection, by reference to the furnace rating label. Voltage range: the voltage on the label and the actual supply voltage should be in the same range –...
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Page 5: Operation
ELF (B) PERATION Operating Cycle The furnace is fitted with a combined Supply light and Instrument switch. The light is on whenever the furnace is connected to the supply. The switch cuts off power to the controller. Connect the furnace to the electrical supply. The Supply light should glow. Operate the instrument switch, located on the front panel, to activate the temperature controller;... - Page 6 ELF (B) MF01...
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Page 7: Controller Operation
ONTROLLER PERATION The controller normally fitted to this furnace is the Carbolite 201 made by Eurotherm. If any other controller is fitted, then a separate manual is supplied. If a time switch is fitted, then a separate manual is supplied. - Page 8 ELF (B) SPrr It is possible to limit the rate of heating by setting a ramp rate. Press Scroll until the legend (SetPoint ramp rate) is displayed. Use Down or Up to display and adjust the value. The ramp rate sets the maximum rate of heating or cooling in degrees per minute. A value of cancels the ramp rate, allowing heating and cooling at the maximum rate.
- Page 9 ELF (B) Operation With the Timer The 201 can be used as a process timer allowing timed heating or timed delay, according to the options in the table. There are 5 timer modes, but 2 of them are affected by whether the setpoint ramp rate feature is being used, making 7 entries in the table.
- Page 10 ELF (B) Setting the Timer Mode .1 to tm.OP OPt.5 Scroll to ; use to view and alter the mode. The mode shows as It is not possible to alter the mode while the timer is running; if the mode cannot be altered, scroll StAt to the parameter and set its value to...
- Page 11 ELF (B) Stopping the Timer StAt To stop the timer at any time while it is running, change the parameter to . This is the same as reducing to zero. The controller then acts as though at has reached the end of the time period.
- Page 12 ELF (B) 4.15 Power Adjustment The furnace control system incorporates electronic power control, including a “power limit” parameter that is used to reduce the effective voltage to 208V (or 104V); the values of the power OP.Hi limit parameter for different voltages are as follows: voltage: 100 ELF 11/6B &...
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Page 13: Overtemperature Control Option
ELF (B) VERTEMPERATURE ONTROL PTION This is only fitted when the overtemperature option is ordered. To identify whether it is fitted, observe the controller panel: if it is fitted the overtemperature key and warning light are present. Note: on the 201 display the letters look like . -
Page 14: 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. -
Page 15: Repairs & Replacements
ELF (B) & 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 16 ELF (B) 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: white positive (type K): green Disconnect the thermocouple from its terminal block and withdraw the thermocouple from its sheath.
- Page 17 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 7.8).
- Page 18 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.
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Page 19: Fault Analysis
ELF (B) AULT NALYSIS A. Furnace Does Not Heat Up The HEAT light The heating Check also that the SSR is working element has failed correctly is ON The HEAT light The controller The thermocouple has broken or has a is OFF shows a very high wiring fault... -
Page 20: Circuit Diagram
ELF (B) & F IRCUIT IAGRAM USES 200-240V models For models up to 16Amps the EMC filter and fuses are EMC Filter integrated onto a circuit board. (circuit board) door switches heat Supply light & Instrument Switch temperature controller thermocouple 100-120V models EMC filters (circuit boards)
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