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4.3
Temperature Control Calibration
After prolonged use the controller and/or thermocouple could require recalibration. 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.
After Sales Service
Carbolite has a team of Service Engineers who repair furnaces both at our factory and at our
customers' premises throughout the world. We also sell spares by mail order. A telephone call or
fax to our Service Department often enables a fault to be diagnosed and the necessary spare part
despatched.
Each unit made has its own record card at Carbolite. In all correspondence please quote the
model type (ABF 8/28) and serial number as given on the rating label. The serial number and
model type are also given on the front of this booklet when supplied together with a new unit.
4.4
Recommended Spares
Carbolite can supply individual spares, or a kit of the items most likely to be required. Please
consult Carbolite Sales Department for details of recommended spares.
4.5
Solid-state Relay Replacement
Disconnect the equipment from the supply and remove the back panel.
Make a note of the wire connections to the solid state relay, and disconnect them.
Remove the solid state relay from the aluminium plate.
Replace and reconnect the solid state relay ensuring that a thin layer of white, heat-conducting
silicon paste (as supplied) is applied between the new relay and the base panel.
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.
4.6
Thermocouple Replacement
Disconnect the equipment from the supply, and remove the 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.
Unscrew the screw and wire fixing 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 screw fixing is used to grip the sheath.
4.7
Element Replacement
If the elements should require replacement a complete insulation assembly or a new insulated
chamber will be supplied.
4.8
Door Plug Replacement
Contact Carbolite Service Department should this require maintenance.
10
MF58 – 1.06
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