Page 1: Table Of Contents
Installation, Operation & Maintenance Instructions 1200°C G-range Tube furnaces Models GHA, GVA, GHC, GVC 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 2: Introduction
The horizontal tube furnaces GHA and GHC are supplied with the controls in an integral base (or, to order, with the base control panel blanked off, and the controls in a separate box). A horizontal tube support kit, comprising some parts of the versatile stand, is also available.
Page 3: Installation
G range 2.0 I NSTALLATION Unpacking & Handling When unpacking or moving the furnace always lift it by its base or by both ends of the main body. Never lift it by the end insulation or by a work tube. It will take 2 or 3 people to lift the furnace, depending on size and configuration.
Page 4 Additional adaptors may be ordered to suit different work tube sizes. Check that the end adaptors are correct for the tube: if not, seek advice from Carbolite. Small alterations to the hole in the adaptors may be made with a file, but first read the section on ceramic fibre safety (5.2).
Page 5 G range Electrical Connections Connection by a qualified electrician is recommended. All furnaces covered by this manual may be ordered for single phase A.C. supply, which may be Live to Neutral non-reversible, Live to Neutral reversible or Live to Live. The 2-element models (-/300) can be supplied for use on two phases of a 3-phase+N supply, and the 3-element models (-/450) for three phases of a 3-phase+N supply or a delta supply up to 240V.
Page 6 G range Models -/600 to -/1200 (and -/450 3-phase) These models are all made to a “universal” wiring scheme, whereby the customer may, if necessary, convert between single- and 3-phase supplies of the following types: - 200 to 240V single-phase - 200 to 240V 3-phase without neutral (delta) - 380/220 to 415/240V 3-phase with neutral To reconfigure the wiring to change between types of supply, see section 7.7.
Page 7: Operation
Operate the instrument switch to activate the temperature controller. The controller becomes illuminated and goes through a short test cycle. Single zone models, GHA and GVA: Set the temperature controller to the desired setpoint or program - see the controller manual.
Page 8 0.5 seconds. Sometimes a furnace using this type of control does not cool down: the end controllers try to remain at the current central temperature. Should this occur, contact Carbolite’s technical department. 2132 Slave Controller Navigation Diagram...
Page 9 G range to the progressive shrinkage of the insulation materials. Cracks are not usually detrimental to the functioning or the safety of the furnace. Operator Safety The ceramic materials used in furnace manufacture become electrically conductive to some extent at high temperatures. Also, there are partially exposed heating coils in the chamber. DO NOT use any conductive tools within the work tube without isolating it.
Page 10: Maintenance
To contact Carbolite 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 11: Repairs & Replacements
G range 5.0 R & 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 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.
Page 12 G range separate the cylindrical body from the base, or remove some guards under the protruding ends of the body. For the versatile models it will be necessary to dismount the furnace from its stand, and remove the mesh terminal cover. Disconnect the furnace from the supply, and separate the furnace body and/or remove covers and guards as necessary.
Page 13 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 of the base or control box.
Page 14: Fault Analysis
G range 6.0 F AULT NALYSIS A. Furnace Does Not Heat Up  The heating  Check also that the SSR is working The HEAT light is ON element has failed correctly  The controller  The thermocouple has broken or has a The HEAT light shows a very high wiring fault...
Page 15: Circuit Diagrams
G range 7.0 C IRCUIT IAGRAMS For standard furnaces -/600 upwards, and -/450 if ordered 3-phase, see 7.7; for 3-zone see also 7.6. Single Phase (models -/300 & -/450) Filter (if fitted) heater contactor switch if fitted Instrument Switch heat coil overtemp.
Page 16 G range 3-phase without neutral (delta) In most instances this diagram does not apply. See 7.7. It may apply if non-standard models are ordered. Filter (if fitted) contactor Instrument Switch heat heat heat coil heater switch if fitted overtemp. controller thermocouple temperature controller...
Page 17 G range 3-phase “universal” wiring (models -/600 and over, & /-450 3-phase) Filters (if fitted) Contactors Instrument Switch heat heat heat coil coil safety switch if fitted overtemp. controller thermocouple temperature controller(s) thermocouple Fuses F1 are always present in this wiring design. Fuses F2 are always present in G range models.
Page 18 G range 3-Zone Control – Broadcast Comms centre (master) (slave) (slave) MF48 -1.18...
Page 19: Fuses & Power Settings
3-phase+N 3-phase supply 1-phase delta fuses 380/220- 200-240V 415/240V 200-240V GHA, GVA 12/300 2 x 12.5A as above, 2-ph+N 1 x 12.5A 6A/ph GHA, GVA 12/450 2 x 16A as above, 3-phase 6 x 7A 6A/ph 10A/ph GHA, GVA 12/600...
Page 20 Non-standard models Special versions (i.e. with non-standard heating elements) may not follow the table above. Check the initial setting (see below) or contact Carbolite if in doubt. Power Adjustment Set the Heater Switch to Off to prevent heating while adjusting the power limit.
Page 21: Specifications
All models have can accept work tubes up to a maximum outside diameter of 170mm. All models have a maximum operating temperature of 1200°C (1100° continuous). Model names are of the type “GHA 12/300” where 300 is the heated length. Sizes range from 300mm heated length (GHA/GVA) or 450mm (GHC/GVC) to 1200mm (all models).
Page 22 MF48 -1.18...
Page 23 MF48 -1.18...
Page 24 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.

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