Carbolite HTR 11/150 - Manual (Page 7)

HTR
MF30 – 3.07
7
4.0 M AINTENANCE
4.1 General Maintenance
No routine maintenance is required. The outer surfaces may be cleaned with a damp cloth. Do not
allow water to enter the interior of the case, tube or control box. Do not clean with organic
solvents.
Silica vessels should be kept clean - see section 3.5.
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, and one heating element.
When ordering spares please quote the model details as requested above.
4.5 Power Adjustment
The furnace control system incorporates electronic power limiting. Depending on the model this
has a maximum setting related to the supply voltage. The power limit parameter
OP.Hi may be
inaccessible to the operator.
Occasionally the power limit is set to zero to permit demonstration of the controls without the
heating elements taking power. In this case the power limit is accessible to the operator and may
safely be reset to its standard value. See section 9.0 for details of power limit settings.