Carbolite PTC 12/20/150 - Manual (Page 11)

PTC
MF11 – 3.08 11
5.0 M AINTENANCE
5.1 General Maintenance
No routine maintenance is required other than 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. Do not clean with organic solvents.
5.2 Controller 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.
See also the instructions for calibrating the controller, section 4.14.
5.3 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.
5.4 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 a pair of thermocouples, one solid state relay and one heating element.
Ceramic end plugs with a variety of centre holes can also be obtained from Carbolite.
5.5 Power Adjustment
The furnace control system incorporates electronic power limiting. In this model the power limit
parameter
OP.Hi is usually set to 100%. It may be accessible to the operator, but should not
generally be altered.
See section 9.2 for any exceptions.