Carbolite CWF Guide

Installation, Operation &
Maintenance Instructions
1100°C - 1300°C Chamber Furnaces
types CWF, BWF & RWF
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 Symbols & Warnings 1
2.0 Installation 3
3.0 Operation 5
4.0 Maintenance 6
5.0 Repairs & Replacements 8
6.0 Fault Analysis 10
7.0 Circuit Diagrams 12
8.0 Fuses & Power Settings 15
9.0 S
p
ecifications 16
Manuals are supplied separately for the furnace controller
(and overtemperature controller when fitted).
Please read the controller manuals before operating the furnace.
1.0
MF02

CWF, BWF, RWF
SYMBOLS & WARNINGS
1.1 Switches and Lights
Supply Light: when the furnace is connected to the electrical supply the
light in the adjacent switch glows
Heat Light: the adjacent light glows or flashes to indicate that power is
being supplied to the elements
1.2 Warning Symbols
DANGER of electrical shoc
k
– 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.
2.0
2 MF02

CWF, BWF, RWF
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.
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 results in poor temperature uniformity.
2.3
MF02 3

CWF, BWF, RWF
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 23 litre models can also be supplied for three phase use: they must only be connected to the
correct type of supply (star or delta at the correct phase to phase voltage). RWF /13 models (and
by special order the CWF & BWF /13) can be supplied for use on two phases out of a three phase
with neutral supply, leaving one phase unused.
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 fit 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 all live
conductors (three phase), and should be within reach of the operator.
The supply MUST incorporate an earth (ground).
ELECTRICAL 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
L3 Black to phase 3 except 2-phase
N Light Blue to neutral except delta
PE Green/Yellow to earth (ground)
2.4 “Universal Wiring”
Year 2000: 23 litre 3-phase models only
Year 2001: 23 litre 1-phase and 3-phase
The 23 litre models (CWF, BWF, RWF --/23) 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.
3.0
4 MF02

CWF, BWF, RWF
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 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 control circuit.
Connect the furnace to the electrical supply. The Supply light should glow.
Operate the instrument switch to activate the temperature controller; the Oposition is off, the
Iposition on. 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 to the instructions supplied.
To switch the furnace off, set the Instrument switch to O. If the furnace is to be left off, isolate it
the electrical supply.
3.2 General Operating Notes
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 accumulates 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.
3.3
MF02 5

CWF, BWF, RWF
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% are to be expected.
If a metal retort is supplied with this furnace, please see the supplementary manual MS05.
3.4 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.
Avoid burns. Carbolite can supply tongs, face masks, and heat resistant gloves. Before you
remove a hot object from the furnace make sure you have a safe place to put it down.
4.0
6 MF02

CWF, BWF, RWF
MAINTENANCE
4.1 General Maintenance
No routine maintenance is required other than removal of soot deposits mentioned in 3.2 and the
occasional replacement of consumable items.
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.
4.2 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 (Thermal 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 Thermal 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, one element or set of elements, and
one hearth tile. For the RWF models, the element is supplied in its metal housing or insulation
box; for the CWF & BWF models, the two side elements are supplied. Individual spares are also
available.
When ordering spares please quote the model details as requested above.
4.5 Power Adjustment
The furnace control system incorporates electronic power limiting. The power limit is set to 100%
except for the single phase CWF --/23 at 240V (to reduce the current demand to 30A) or for
unusual 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.
Occasionally the power limit is set to zero to permit demonstration of the controls without the
heating elements taking power. To resume heating the power limit should be reset to its standard
value.
5.0
MF02 7

CWF, BWF, RWF
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
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.
Normal use of the furnace does not result in any significant level of airborne dust from these
materials, but much higher levels may be encountered during maintenance or repair.
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 dust from fibre which has been used at high temperatures may cause
respiratory disease.
When handling fibre always use an approved mask, eye protection, gloves and long
sleeved clothing.
Avoid breaking up waste material. Dispose of waste fibre 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 Ceramic Fibre
Industry Association Bulletin No. 11 and the UK Health and Safety Executive Guidance Note
EH46.
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.
5.5
8 MF02

CWF, BWF, RWF
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) positive (type R)
White green orange
Disconnect the thermocouple from its terminal block.
Bend the metal tag 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 to grip the
sheath.
5.6 Panel Element Replacement (CWF & BWF)
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, and one unheated hearth slab.
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.
Withdraw the old element(s), and insert the new. Note that in the 23 litre models the ceramic
element carriers are in two parts: handle with care.
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.
220-240V
200-210V 110-120V 100V
L
N
L
N
5 &13 litre models
=element
Example Connections
N
CWF /23 element connection example
(1-phase 200-240V)
L
N
L
L
N
link
terminal block
MF02 9

CWF, BWF, RWF
5.7 RWF Element Replacement
See section 5.2- wearing a face mask is recommended.
The special RWF heating elements form the chamber sides, base and roof in a single module. The
element is fragile, so spare elements are supplied complete in an insulation box to avoid damage.
Disconnect the furnace, remove the back panel, make a plan and disconnect the lead, as for CWF,
section 5.6 above.
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 .... (etc., as for CWF, section 5.6).
Remember to make a plan of the connections.
5.8 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.
5.9 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.
6.0
10 MF02

CWF, BWF, RWF
FAULT ANALYSIS
A. Furnace Does Not Heat Up
1. The HEAT light
is ON ÆThe heating
element has failed ÆCheck 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
ÆThe thermocouple has broken or has a
wiring fault
The controller
shows a low
temperature
ÆThe door switch(es) (if fitted) may be
faulty or need adjustment
ÆThe contactor (if fitted) may be faulty
ÆThe 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
ÆThe SUPPLY
light is ON ÆThe controller may be
faulty or not receiving a
supply due to a faulty
switch or a wiring fault
ÆThe SUPPLY
light is OFF ÆCheck the supply fuses and
any fuses in the furnace
control compartment
B. Furnace Overheats
1. The HEAT light
goes OFF with
the instrument
switch
ÆThe controller
shows a very high
temperature
ÆThe controller is faulty
ÆThe controller
shows a low
temperature
ÆThe thermocouple may have been shorted
out or may have been moved out of the
heating chamber
ÆThe thermocouple may be mounted the
wrong way round
ÆThe controller may be faulty
2. The HEAT light
does not go off
with the
instrument
switch
ÆThe SSR has failed
“ON” ÆCheck for an accidental wiring fault which
could have overloaded the SSR
7.0
MF02 11

CWF, BWF, RWF
CIRCUIT DIAGRAMS
Safety Switches type A, up to 25A rating: two Door Switches directly in the element circuit.
Safety Switch type B, over 25A rating: a single Door Switch in the contactor coil circuit.
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 – year 2001 onwards: single phase model --/23 replaced by Universal model – see 7.4.
Supply ligh
t
Instrument Switch
coil
temperature
controller
overtemp.
controller
safety
switch B
thermocou
p
le
PE
L
N
SSR
e
l
e
m
e
n
t
(s)
F3
F3
safety
switches A
F1
F2
thermocou
p
le
i
f
f
itted
Filter
(
if fitted
)
contacto
r
if fitted
hea
t
on
7.2 2-phase with neutral
Please enquire if a diagram is required.
7.3 Higher Voltages (e.g. 254V; 440V, 480V 3-phase)
The diagram above (7.5) normally applies, with neutral (if present) not being used.
For single phase models of 254V or above, diagram 7.1 or 7.4 applies except that a control circuit
transformer is included as in diagram 7.5.
12 MF02

CWF, BWF, RWF
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.
7.5
Supply light &
Instrument Switch
coil
temperature
controller
overtemp.
controller thermocouple
safety
switch
SSR
hea
t
on
F3
F1 F2
F3
SSR
SSR
F3
hea
t
on
F3
e
l
e
m
e
n
t
(s)
hea
t
on
F3
F3
i
f
f
itted
Contactors
(2 or 3)
Filters
e
l
e
m
e
n
t
(s)
e
l
e
m
e
n
t
(s)
N
L
L
N
L
N
thermocouple
Fuses or
EMC filters
Supply
Terminals
Circuit no. 3
Circuit no. 2
N
L
N
L
N
L3
L2
L1
N
PE
L Circuit no. 1
3-phase + neutral
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
coil
3-phase delta
Supply
Terminals Fuses or
EMC filters
N
L
N
L
N
L3
L2
L1
N
L
PE
Supply
Terminals
N
L
N
L
N
L3
L2
L1
N
PE
L
1-phase
Circuit no. 1
Circuit no. 2
N
ot
used
Circuit no. 3
Fuses or
EMC filters
C
ir
cu
it n
o.
1
N
ot
used Circuit no. 2
Circuit no. 3
MF02 13

CWF, BWF, RWF
3-phase without neutral (star – e.g. 380 to 415V)
e
l
e
m
e
n
t
(s)
e
l
e
m
e
n
t
(s)
F1
L2
L3
F2
L1
PE
Filter
(
if fitted
)
e
l
e
m
e
n
t
(s)
47
k
contacto
r
transforme
r
coil
temperature
controller thermocouple
overtemp.
controller thermocouple SSR
hea
t
on
Supply light &
Instrument Switch
F2
F3
if ove
r
-
temperature
fitted
safety switch
47
k
hea
t
on
F3 F3
hea
t
on
47
k
SSR
In this configuration the fuses F2 on the supply side of the transformer may be GEC
Safeclip, not 32 x 6mm glass as stated in section 8.1.
8.0
14 MF02

CWF, BWF, RWF
FUSES & POWER SETTINGS
8.1 Fuses
F1-F3: Refer to the circuit diagrams.
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 Volts Supply Fuse Rating
CWF -/5 1-phase 220-240 10A 110-120 20A
CWF -/5 1-phase 208 12.5A
CWF -/13 1-phase 220-240 12.5A 110 / 120 25A / 32A
CWF -/13 1-phase 208 16A
CWF -/23 1-phase 220-240 30-32A
CWF -/23 1-phase 208 40A 208 delta 25A/ph
CWF -/23 3-phase 380/220 - 415/240 12.5A/ph 220-240 delta 20A
RWF -/5 1-phase 220-240 12.5A 110-120 25A
RWF -/5 1-phase 208 16A
RWF -/13 1-phase 220-240 25A 110-120 50A
RWF -/13 1-phase 208 25A
RWF -/13 2-phase+N 380/220 - 415/240 12.5A/ph
RWF -/23 1-phase 220-240 40A
RWF -/23 1-phase 208 50A 208 delta 25A/ph
RWF -/23 3-phase 380/220 - 415/240 12.5A/ph 220-240 delta 25A/ph
BWF range - same as CWF
8.2 Power Settings
The settings of the power limit parameter OP.Hi are as follows.
model volts: 200 208 220, 280 230, 400 240, 415 254, 440
CWF 11/23, 12/23, 13/23 100 100 100 100 94 83
all other models 100 100 100 100 100 89
9.0
MF02 15

SPECIFICATIONS
Carbolite reserves the right to change specifications without notice.
9.1 Models Covered by this Manual
MODEL Max.
Temp. Max. Power Chamber Size (mm)
Approx.
Capacity Net Weight
(°C) (kW) HWD(l) (kg)
Chamber furnaces heated by resistance wire inserted in refractory formers.
CWF 11/5 1100°C 2.4 135 140 250 5 30
CWF 11/13 1100°C 3.1 200 200 325 13 47
CWF 11/23 1100°C 7.5 235 245 400 23 68
CWF 12/5 1200°C 2.4 135 140 250 5 30
CWF 12/13 1200°C 3.1 200 200 325 13 47
CWF 12/23 1200°C 7.5 235 245 400 23 68
CWF 13/5 1300°C 2.4 135 140 250 5 30
CWF 13/13 1300°C 3.1 200 200 325 13 47
CWF 13/23 1300°C 7.5 235 245 400 23 68
Burn-off versions of the above.
BWF 11/13 1100°C 3.1 200 200 325 13 47
BWF 12/13 1200°C 3.1 200 200 325 13 47
Chamber furnaces heated by resistance wire embedded in low thermal mass
insulation.
RWF 11/5 1200°C 2.75 130 160 250 5 28
RWF 11/13 1200°C 5.0 195 210 325 13 45
RWF 11/23 1200°C 9.1 220 260 400 23 65
RWF 12/5 1200°C 2.75 130 160 250 5 28
RWF 12/13 1200°C 5.0 195 210 325 13 45
RWF 12/23 1200°C 9.1 220 260 400 23 65
9.2 Environment
The furnaces contain electrical parts and should be stored and used in indoor conditions as
follows:
temperature: 5°C - 40°C
relative humidity: maximum 80% up to 31°C decreasing linearly to 50% at 40°C
MF02-3.12 5/12/00 CWF
Carbolite, Parsons Lane, Hope,
Hope Valley, S33 6RB, England.
Telephone: [phone]
Int: [phone]
Facsimile: [phone]
Int: [phone]
E-mail: [email protected]
For preventi
v
e maintenance, repair and calibration of all Furnace
and Oven products, please contact:
Thermal Engineering Services
Telephone: UK: 0845 3308035 Int: [phone]
Fax: UK: 0845 3308036 Int: [phone]
Email: [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
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our nearest stockist.