CWF, BWF, RWF
M
AINTENANCE
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
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