Carbolite VMF User Manual

CONTENTS

Section page

Installation, Operation &

Maintenance Instructions

1000°C - 1200°C Furnaces

types AAF, GSM, VMF

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.

Manuals are supplied separately for the furnace controller

(and overtemperature controller when fitted).

Please read the controller manuals before operating the furnace.

MF06 – 3.32

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

DANGER of electrical shock– read any warning printed by this symbol.

DANGER – hot surface. Read any warning printed by this symbol.
WARNING: all surfaces of a furnace may be hot.

DANGER – read any warning printed by this symbol.

AAF, GSM, VMF

1.0 DESCRIPTIONS

The chamber furnaces covered by this manual all have some specialist feature as follows.

1.1 AAF models

The AAF Ashing Furnaces incorporate pre-heated chamber airflow. The chambers of the

AAF 11/3, AAF 12/3, AAF 11/7 and AAF 12/7 are ceramic muffles wound with resistance wire.
The model AAF 11/18 and 12/18 have chambers heated by wire spirals mounted in ceramic
carriers, isolated from the working chamber by side walls of silicon carbide.

Each AAF model is supplied with an Inconel tray complete with detached handle. The AAF 11/18

and 12/18 models have a double-decker tray arrangement.

1.2 GSM 11/7

This is a conventional muffle furnace, with a Silica chamber which gives a cleaner environment
than a standard ceramic muffle.

1.3 VMF 10/6

The Volatile Matter Furnace is designed for compliance with ISO 562. It is heated by wire
elements embedded in light weight ceramic fibre, and incorporates calibration ports to allow
insertion of thermocouple probes from the back under the crucibles.

1.4 Switches and Lights

1.5 Warning Symbols

2 MF06 – 3.32

AAF, GSM, VMF

CONNECTION DETAILS

supply type

Supply

Terminal label

Cable colour

Live-Neutral

Reversible or Live-Live

1-phase

L

Brown

to live

to either power conductor

N

Blue

to neutral

to the other power conductor

PE

Green/Yellow

to earth (ground)

to earth (ground)

supply

Terminal label

Cable colour

2- or 3-phase

L1

Black

to phase 1

L2

Black

to phase 2

2.0 INSTALLATION

2.1 Unpacking & Handling

When unpacking or moving the furnace always lift it by its base. Never lift it by the door. Use two

people to carry the furnace where possible. Remove any packing material from the door gear and
furnace chamber before use.

NOTE: This product contains Refractory Ceramic Fibre (better described as Alumino Silicate

Wool) for precautions and advice in handling this material see the ‘Repairs and Replacements’

section.

2.2 Siting & Setting Up

Place the furnace in a well ventilated room, away from other sources of heat, and on a surface

which is resistant to accidental spillage of hot materials. Do not mount the furnace on an
inflammable surface.

Ensure that there is free space around the furnace. Do not obstruct any of the vents in the control

section: they are needed to keep the controls cool.

Ensure that the furnace is placed in such a way that it can be quickly switched off or disconnected

from the electrical supply - see below.

If the chimney is supplied unfitted, then fit it into the hole in the top of the furnace case. If the

furnace is to be used to heat substances which emit fumes, then a fume extraction duct of about
150mm inlet diameter may be placed directly above the chimney outlet. Do not make a sealed
connection to the furnace chimney as this causes excessive airflow through the chamber and gives
poor temperature uniformity.

2.3 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. AAF 11/7 may
alternatively be ordered for use on two phases out of a 3-phase with neutral supply. The model
AAF 11/18 may be ordered for 1- or 3-phase supply: see section 2.4.

Check the furnace rating label before connection. The supply voltage should agree with the

voltage on the label, and the supply capacity should be sufficient for the amperage on the label.

The supply should be fused at the next size equal to or higher than the amperage on the label. A

table of the most common fuse ratings is also given in section 8.1 of this manual. Where a supply

cable is present there are internal supply fuses; customer fusing is preferred but not essential.
Furnace with supply cable: either wire directly to an isolator or fitted with a line plug.
Furnace without supply cable: a permanent connection to a fused and isolated supply should be

made to the internal terminals after temporary removal of the furnace back panel.
Connection by line plug: the plug should be within reach of the operator, and should be quickly

removable.
Connection to isolating switch: this should operate on both conductors (single phase) or on both

live conductors (two phase), and should be within reach of the operator.
The supply MUST incorporate an earth (ground).

MF06 3.32 3

L3

Black

to phase 3 except 2-phase

N

Light Blue

to neutral except delta

PE

Green/Yellow

to earth (ground)

AAF, GSM, VMF

2.4 “Universal Wiring”

Year 2000: 18 litre 3-phase models only

Year 2001 onwards: 18 litre 1-phase and 3-phase

The AAF 11/18 and 12/18 can be easily rewired between 1-phase and 3-phase supplies. This

applies to 3-phase+N and 3-phase delta in the ranges 380/220V–415/240V and 208-240V, but

does not apply to 3-phase star without neutral (e.g. 380V).

To alter the configuration, remove the back panel and alter the wiring connections between the

supply terminal block and the EMC filters, using the appropriate diagram from section 7.4.

Models made for single phase only (e.g. before year 2001) are not affected and cannot be

converted to 3-phase.
If in doubt, please consult Carbolite.

4 MF06 – 3.32

AAF, GSM, VMF

3.0 OPERATION

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.

3.1 Operating Cycle

The furnace is fitted with an instrument switch. The switch cuts off power to the control circuit.
Connect the furnace to the electrical supply.
Operate the instrument switch to activate the temperature controller. The controller becomes

illuminated and goes through a short test cycle.
Close the furnace door and adjust the temperature controller – see the controller manual.
Overtemperature option only. If the overtemperature controller has not yet been set as required,

set it and activate it according to the instructions in the appropriate manual.
Unless a time switch is fitted and is off, the furnace starts to heat up. The Heat light(s) glow

steadily at first and then flash as the furnace approaches the desired temperature or a program

setpoint.
Overtemperature option only. If the overtemperature trip operates then an indicator in the

overtemperature controller flashes, and the heating elements are isolated. Find and correct the

cause before resetting the overtemperature controller according the instructions supplied.
To turn the furnace off, set the Instrument switch to it’s off position; the controller display will go

blank. If the furnace is to be left off unattended, isolate it the electrical supply.

3.2 General Operating Advice

Heating element life is shortened by use at temperatures close to maximum. Do not leave the

furnace at high temperature when not required. The maximum temperature is shown on the

furnace rating label and on the back page of this manual.
When heating large objects, in particular poor conductors, avoid shielding the thermocouple from

the heating elements. The thermocouple is intended to sense the temperature near the heating

element, but if a large object is placed in the chamber it may record the average temperature of the

object and the elements, which can lead to overheating of the elements. Allow large objects to

gain heat at a lower temperature and then reset the controller to a temperature close to the desired

maximum.
When heating materials which produce smoke or fumes, the chimney must be correctly fitted and

unobstructed. Otherwise, soot can accumulate in the chamber and could possibly cause an

electrical breakdown of the heating element.
If the furnace is used to heat materials which emit smoke or fumes, regularly heat it up to

maximum temperature for one hour without load to burn away the soot.
Materials such as case hardening compounds and other reactive salts may penetrate the furnace

chamber lining and attack the wire elements, causing premature failure. Use of a hearth tile may

be advisable: please consult our technical department.
Lightweight 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

MF06 3.32 5

AAF, GSM, VMF

Any metal object used to probe into the furnace chamber while the furnace is

connected to the supply must be earthed (grounded). This applies in particular to

metal sheathed thermocouples, where the sheaths must be earthed. The refractory

material of the chamber lining becomes partly conducting at high temperatures, and

the electric potential inside the chamber can be at any value between zero and the

supply voltage. Unearthed probes can cause serious electric shock.

3.4 Atmospheres

When an optional gas inlet is fitted there is a label near the inlet saying "INERT GAS ONLY". In

practice inert or oxidising gases may be used, but not combustible or toxic gases. Chamber

furnaces are not gas tight, so it should be understood that gas usage may be high, and that the

chamber is likely always to contain some air. Residual oxygen levels of 1% may be expected.

3.5 Operator Safety

The furnace incorporates a safety switch which interrupts the heating element circuit when the

door is opened. This prevents the user touching a live heating element, but also prevents the

furnace from heating up if the door is left open. The operation of this switch should be checked

periodically – see section 4.1.2.
Avoid burns: furnace surfaces can be hot. Before you remove a hot object from the furnace make

sure you have a safe place to put it down.

3.6 Power Adjustment

The furnace control system incorporates electronic power limiting, which is used in some models

to compensate for voltage to achieve the same power over a range of voltage supplies. In other

models the power limit is set to 100% over all common voltages. The power limit parameter OP.Hi

may be accessible to the operator, but should not generally be altered.
See section 8.2 for details of power limit settings. DO NOT adjust the power to a level higher that

the design level stated: this may cause fuse to blow, and could damage the heating elements.
The power limit may be set to a lower limit if the furnace is to be used at a low temperature only:

this may give better control stability. It may set to zero to permit demonstration of the controls

without the heating elements taking power; to resume heating reset it to its standard value.

6 MF06 – 3.32

AAF, GSM, VMF

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. Do not clean with organic solvents.

4.1.2 Safety Switch

The door switch operation mentioned in 3.5 should be checked periodically to ensure that heating

elements are isolated when the door is opened. In normal conditions the safety arrangement should

outlast the furnace, but it could be affected by rough handling, a corrosive environment or work

materials, or exceptional frequency of use.

A qualified electrician should check that the supply to the heating elements is cut, with and

without power being on, when the door is open partially and fully; it is important that isolation is

not just marginally achieved. The check is best made on the element terminals after removal of the

furnace back: probing the element surface inside the furnace could be inconclusive because of

surface oxidation. Note that all live supply wires of a 3-phase supply, and both live and neutral of

a 1-phase supply, should be isolated when the door is opened.

4.2 Calibration

After prolonged use the controller and/or thermocouple could require recalibration. This would be

important for processes which require accurate temperature readings or which use the furnace

close to its maximum temperature. A quick check using an independent thermocouple and

temperature indicator should be made from time to time to determine whether full calibration is

required. Carbolite can supply these items.
Depending on the controller, the controller manual may contain calibration instructions.

4.3 After Sales Service

Carbolite’s service division (Carbolite Engineering Services) has a team of Service Engineers

capable of repair, calibration and preventive maintenance of furnace and oven products at our

customers’ premises throughout the world. We also sell spares by mail order. A telephone call or

fax often enables a fault to be diagnosed and the necessary spare part despatched.
Each furnace has its own record card at Carbolite. In all correspondence please quote the serial

number, model type and voltage given on the rating label of the furnace. The serial number and

model type are also given on the front of this booklet when supplied with a furnace.
To contact Carbolite Engineering Services or Carbolite see the back page of this manual.

4.4 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 solid state relay, one door insulation piece, and one element or set of elements.

Individual spares are also available.
When ordering spares please quote the model details as requested above.

MF06 3.32 7

AAF, GSM, VMF

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 Note - 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.

These materials may be in the form of blanket or felt, formed board or shapes, mineral wool slab

or loose fill wool.

Whilst there is no evidence of any long term health hazards, we strongly recommend that safety

precautions are taken whenever the materials are handled.

Exposure to fibrous dust may cause respiratory disease.

When handling the material always use an approved respiratory protection equipment

(RPE-i.e. FFP3), eye protection, gloves and long sleeved clothing.

Avoid breaking up waste material. Dispose of waste in sealed containers.

After handling rinse exposed skin with water before washing gently with soap (not

detergent). Wash work clothing separately.

Before commencing any major repairs we recommend reference to the European Association

representing the High Temperature Insulation Wool industry (www.ecfia.eu)

We can provide further information on request. Alternatively our service division can quote for

any repairs to be carried out at your premises or ours.

5.3 Temperature Controller Replacement

201. This controller is fitted to the back of the control panel; in many models this can be separated

from the base by removal of two screws.
Before handling the controller: wear an anti-static wrist strap or otherwise avoid any possibility

of damage to the unit by static electricity.
Refer to the detailed instructions supplied with the replacement controller.
2132, 2416, 2408 etc. Ease apart the two lugs at the side; grip the instrument and withdraw it from

its sleeve; push in the replacement.

5.4 Solid-state Relay Replacement

Disconnect the furnace from the supply, and remove the furnace back panel.
Make a note how the wires are connected 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 heat-conducting thermal pad is

sandwiched between the relay and the base panel or aluminium plate. Alternatively a thin layer of

white, heat-conducting silicon paste may be applied between the new relay and the plate.
The new solid state relay contains a built-in MOV which protects it from short periods of excess

voltage. If the old relay had a separate disc-shaped "MOV" connected between the high voltage

terminals of the old relay, discard the old MOV.
Replace the removed panel

8 MF06 – 3.32

AAF, GSM, VMF

Negative

positive (type K)

White

green

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:

Disconnect the thermocouple from its terminal block.
Bend the metal tag, or release the screw, to release the thermocouple sheath, withdraw the sheath,

and shake out any fragments of thermocouple.
Re-assemble with a new thermocouple observing the colour coding, ensuring that the

thermocouple is not twisted as it is being inserted and that the metal tag is bent back, or the screw

inserted, to grip the sheath.

5.6 Element Replacement (AAF 11/3, AAF 12/3, AAF 11/7, AAF 12/7, GSM)

See section 5.2 - wearing a face mask is recommended.
The chamber of this type of furnace is formed by winding resistance heating wire on to a

refractory muffle former. In the event of failure, the whole "wound muffle" assembly must be

replaced.
Disconnect the furnace from the supply and remove the furnace back panel. GSM: Pull the

chimney out of the top of the furnace.
Make a note of the wiring connections; see the section above which refers to the thermocouple

colour coding.
Unfasten the electrical connections to the inner chamber (brick-box) and remove the thermocouple

and sheath (see thermocouple replacement instructions). If the connections are secured by

hexagonal nuts, two spanners should be used to avoid cracking the porcelain mounting.
Undo any self-tapping screws and hook bolts necessary to release the brick-box.
Support the front of the brick-box as you withdraw it from the case so it does not fall onto the

electrical connections below.
Remove the brick-box lid and top insulating board, noting how it is assembled and observing the

position of the heating element wires (or “tails”).
Pull the element tails out of the terminal block and remove sufficient insulation to allow access to

the heating element. Check and replace damaged insulation.
Fit the new heating element,

ensuring that the tails are separated

from the element by at least 25 mm

(preferably 50mm) of insulation –

see the picture.
Feed the element tails through the

terminal blocks and tighten the

clamping screws using two spanners

as before. Cut off excess element tails.
Complete the fitting of the insulation and refit the lid. Do not use any cement unless supplied by

Carbolite, as other types may chemically attack the heating element.
Replace and fasten the brick-box into the furnace case.
Replace the thermocouple and sheath and remake the electrical connections. In porcelain and brass

terminal blocks the brass connector should be slightly loose in its porcelain support block to allow

for expansion.
Replace the back panel and reconnect the electrical supply.

MF06 3.32 9

N

AAF 11/18 element connection example

(1-phase 200-240V)

L

N

L

L N link

terminal
block

AAF, GSM, VMF

Switch the furnace ON and heat to 900°C without interruption, and then soak for 1 hour. Some

smoke may be observed during this process, which should be carried out in a well ventilated area.
Check that the furnace is controlling properly to rule out the possibility that previous element

failed because of a fault in the control circuit.

5.7 Panel Element Replacement (AAF 11/18 and 12/18)

See section 5.2 - wearing a face mask is recommended.

The chambers have two side-mounted refractory panels in which coiled heating elements are

inserted, normally out of sight behind silicon carbide chamber walls.
Disconnect the furnace from the supply and remove the furnace back panel.
Make a written plan showing ALL the element and thermocouple connections. It is important to

make this plan for each individual furnace.
Disconnect all the element wire tails and thermocouple cables from their terminal blocks.
Straighten all the element tails. Note that these become brittle with use.
Unscrew the screws fixing the metal back piece from the inner chamber and withdraw this part

backwards complete with thermocouple(s) and sheath(s).
Withdraw the back insulation piece. Handle with care. Observe the warning on handling of

ceramic fibrous insulation – section 5.2.
Remove the Silicon Carbide chamber side walls, then withdraw the old element(s), and insert the

new. Note that the ceramic element carriers are in two pieces, front and back: take care when

handling them.
Replace the back insulation piece and metal piece together with the thermocouple(s) and sheath(s).
As necessary, shorten the element tails by clipping to length.
Remake all the thermocouple and element connections according to the individual plan.
Refit the back panel and run the furnace for 30 minutes at 800°C without interruption to ensure

complete burn-off of any organic binders. Some smoke may be observed during this process,

which should be carried out in a well ventilated area.
Check that the furnace is controlling properly to rule out the possibility that previous element

failed because of a fault elsewhere in the control circuit.

10 MF06 – 3.32

AAF, GSM, VMF

5.8 VMF 10/6 Element Replacement

See section 5.2 - wearing a face mask is recommended.
The heating elements are vacuum formed modules; they are fragile, so spare elements are supplied

complete in an insulation box to avoid damage.
Disconnect the furnace, remove the back panel, make a plan of all the internal connections to the

back of the heating chamber and disconnect. Remove the thermocouple(s) and support tube(s).
Using a socket spanner undo the four bolts that fasten the insulation box. These are located under

the insulation box in the two cross supports.
Remove the insulation box by carefully sliding it out through the back of the furnace case.
Carefully slide in the new insulation box, and fasten the four bolts. DO NOT support the element

by putting your hand inside the chamber – the element is fragile.
As necessary, shorten the element tails by clipping to length. Remake all the thermocouple and

element connections according to the individual plan.
Refit the back panel and run the furnace for 30 minutes at 800°C without interruption to ensure

complete burn-off of any organic binders, Some smoke may be observed during this process,

which should be carried out in a well ventilated area.
Check that the furnace is controlling properly to rule out the possibility that the previous element

failed because of a fault elsewhere in the control circuit.

5.9 Door Plug Replacement

Lift the furnace door to the open position and remove the door cover from the plug carrier

assembly.
Remove the old door plug by sliding it upwards out of its carrier.
Slide the new plug into the carrier assembly making sure that the plug is the correct way up.
Refit the door cover.
When first heating the furnace after a replacement, ensure that the ventilation is good: emission of

some fumes may be expected.

5.10 Fuse Replacement

Fuses are marked on the circuit diagram (section 7.0) with type codes, e.g. F1, F2. A list of the

correct fuses is given in section 8.1. 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.
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.

MF06 3.32 11

A.

Furnace Does Not Heat Up

1.

The HEAT light
is ON



The heating
element has failed



Check also that the SSR is working
correctly

2.

The HEAT light
is OFF



The controller
shows a very high
temperature or a
code such as S.br



The thermocouple has broken or has a
wiring fault
 The controller
shows a low
temperature



The door switch(es) (if fitted) may be
faulty or need adjustment

 The contactor (if fitted) may be faulty

 The SSR could be failing to switch on due
to internal failure, faulty logic wiring from
the controller, or faulty controller

 There are no lights
glowing on the
controller



Check the supply fuses and any fuses in the
furnace control compartment

 The controller may be faulty or not
receiving a supply due to a faulty switch or
a wiring fault

B.

Furnace Overheats

1.

The HEAT light
goes OFF with
the instrument
switch



The controller
shows a very high
temperature



The controller is faulty

 The controller
shows a low
temperature



The thermocouple may have been shorted
out or may have been moved out of the
heating chamber

 The thermocouple may be mounted the
wrong way round

 The controller may be faulty

2.

The HEAT light
does not go off
with the
instrument
switch



The SSR has failed
“ON”



Check for an accidental wiring fault which
could have overloaded the SSR

AAF, GSM, VMF

6.0 FAULT ANALYSIS

12 MF06 – 3.32

AAF, GSM, VMF

F1

N

F2

L1

PE

transformer

Filter (if fitted)

F2

Instrument Switch

for AAF 11/18 see diagram 7.4

Instrument Switch

coil

temperature

controller

overtemp.
controller

door

switch

SSR

e

l

e

m

e
n

t

(s)

heat

on

F3

F1

F2

F3

L

PE

Filter (if fitted)

contactor

or relay

if fitted

thermocouple

thermocouple

e

l

e

m

e
n

t

(s)

e

l

e

m

e
n

t

(s)

F1

N

L2

F2

L1

PE

Instrument Switch

coil

temperature

controller

overtemp.

controller

door

switch

SSR

heat

on

F3

SSR

heat

on

F3

Filter (if fitted)

if fitted

thermocouple

thermocouple

contactor

7.0 CIRCUIT DIAGRAMS

EMC Filters (if fitted): dependent on the model there may be one filter, or more than one fitted in

parallel. The circuit diagram examples do not show multiple filter arrangements.

7.1 Single phase

NOTE – models before mid-2002: in some models two door switches were fitted directly in the

element circuit, instead of a single switch and contactor.

7.2 2-phase with neutral

7.3 Higher Voltages (e.g. 254V)

For single phase models of 254V or above, a control

circuit transformer is included as follows:

MF06 3.32 13

A model made to this diagram can be
converted by the customer between the
following supply voltages:

between 3-phase + neutral in the range

380/220V – 415/240V

and 3-phase delta in the range

220V – 240V

and single phase in the range

220V – 240V

208V model: convertable from 208V delta
to 208V 1-phase

3-phase + neutral

Circuit no. 1

N L N

L

Circuit no. 2

Circuit no. 3

N

L3

L2

L1

Supply
Terminals

N

L

Fuses or
EMC filters

PE

Not
used

3-phase delta

Circuit no. 1

N L N

L

Circuit no. 2

Circuit no. 3

N

L3

L2

L1

Supply
Terminals

N

L

Fuses or
EMC filters

PE

1-phase

Circuit no. 1

N L N

L

Circuit no. 2

Circuit no. 3

N

L3

L2

L1

Supply
Terminals

N

L

Fuses or
EMC filters

PE

Not
used

Applies only to AAF 11/18

Instrument Switch

coil

temperature

controller

overtemp.
controller

thermocouple

door

switch

SSR

heat

on

F3

F1

F2

F3

SSR

SSR

F3

heat

on

F3

e
l
e

m

e

n

t

(s)

heat

on

F3

F3

if fitted

Contactors

(2 or 3)

Filters (if fitted)

e

l

e

m

e
n

t

(s)

e
l
e

m

e

n

t

(s)

coil

L N L N L

N

thermocouple

AAF, GSM, VMF

7.4 3-phase “universal” wiring

Fuses F1 are always present in this wiring design.
Fuses F2 could be absent in some circumstances, if the circuit does not exceed 10A.
Fuses F3 are present if the circuit exceeds 25A, but otherwise are usually absent.

14 MF06 – 3.32

F1

Internal
supply
fuses

Fitted if supply cable fitted.
Fitted on board to some types of EMC filter.

on-board and up to 16 Amps:
32mm x 6mm type F

other: GEC Safeclip

F2

Auxiliary
circuit
fuses

Fitted on board to some types of EMC filter.
May be omitted up to 25Amp/phase supply

rating.

2 Amps glass type F
On board: 20mm x 5mm
Other: 32mm x 6mm

F3

Heat Light
fuses

May be omitted up to 25 Amp/phase supply
rating.

2 Amps glass type F
32mm x 6mm

Customer
fuses

Required if no supply cable fitted.
Recommended if cable fitted.

See rating label for amperage;
see table below for fuse rating.

Model

Phases

Volts

Supply Fuse
rating

AAF 11/3

1-phase

200-240

10A 1-phase

110

20A

AAF 11/7

1-phase
1-phase
1-phase
2-phase+N

220-240
200-208
110-120
380/220-415/240

20A
20A
40A
10A per phase

AAF 11/18

1-phase

220-240

30A 1-phase

200-208

40A 3-phase+N

380/220-415/240

12.5A per phase

3-phase delta

220-240

20A per phase

3-phase delta

200-208

25A per phase

AAF 12/3

1 phase

200 - 240

10A

AAF 12/7

1-phase

220–240

25A

AAF 12/18

1-phase

220-240

30A 1-phase

200-208

40A 3-phase+N

380/220-415/240

12.5A per phase

3-phase delta

220-240

20A per phase

3-phase delta

200-208

25A per phase

GSM 11/8

1-phase
1-phase
1-phase

220-240
200-208
110-120

12.5A
15A or 16A
25A

VMF 10/6

1-phase

220-240

12.5A

model volts:

110

200

208

220, 380

230, 400

240, 415

254, 440

AAF 11/3

87

100

98

87

80

73

65

AAF 11/18

100

100

100

100

94

83

AAF 12/3

100

95

85

78

71

AAF 12/7

100

100

100

AAF 12/18

100

100

100

100

94

83

all other models

100

100

100

100

100

89

8.0 FUSES & POWER SETTINGS

8.1 Fuses

F1-F3: Refer to the circuit diagrams.

AAF, GSM, VMF

8.2 Power Settings

The settings of the power limit parameter OP.Hi are as follows.

MF06 3.32 15

Carbolite, Parsons Lane, Hope,

Hope Valley, S33 6RB, England.

Telephone: [phone]

Fax: [phone]

E-mail: [email protected]

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.

Copyright © 2014 Carbolite Limited

For preventive maintenance, repair and calibration of all Furnace

and Oven products, please contact:

Carbolite Engineering Services

Telephone: [phone]
Fax: [phone]
Email: [email protected]

MF06 – 3.32 14/08/14

9.0 SPECIFICATIONS

MODEL

Max.
Temp.

Max.
Power

Chamber Size (mm)

Heating Elements

Net
Weight

(°C)

(kW)

H W D

(l)

(kg)

Ashing, Burn-off and Coal & Coke Testing Furnaces

AAF 11/3

1100°C

2.1

85

150

250

Wound muffle

22

AAF 11/7

1100°C

3.9

90

170

445

Wound muffle

63

AAF 11/18

1100°C

7

235

196

400

Concealed wire

70

AAF 12/3

1200°C

2

85

150

250

Wound Muffle

22

AAF 12/7

1200°C

6

90

170

445

Wound Muffle

63

AAF 12/18

1200°C

7

235

196

400

Concealed wire

70

GSM 11/8

1100°C

3.0

125

185

345

Wound silica muffle

63

VMF 10/6

1000°C

3.0

100

210

260

Vacuum formed slabs

45

temperature:

5°C - 40°C

relative humidity:

maximum 80% up to 31°C decreasing linearly to 50% at 40°C

Carbolite reserves the right to change specifications without notice.

9.1 Models Covered by this Manual

9.2 Environment

The furnaces contain electrical parts and should be stored and used in indoor conditions as

follows: