MRF 16/22
50
MF 55-GB 1.21
B.
Furnace overheats
Æ
The controller shows a
very high temperature
Æ
The controller is faulty
Æ
The thermocouple may have been
shorted out or may have been moved
out of the furnace
Æ
The thermocouple may be mounted
the wrong way round
1. The
HEAT
light
goes
OFF
with
the instrument
switch
Æ
The controller shows a
low temperature
Æ
The controller may be faulty
2. The
HEAT
light
does not go off
with the
instrument switch
and the fault
persists when a
5A control fuse is
removed from its
fuse-holder
Æ
The power thyristor has
failed “ON”
Æ
Check for an accidental wiring fault
which could have overloaded the
thyristor.
Isolate the furnace if this fault
persists.
C.
Microwave faults
For any microwave faults, contact Carbolite at the address given at the back of this manual.
15 Environment
The furnace contains electrical parts and should be stored and used indoors in conditions
as follows:
Temperature:
5°C
-
40°C
Relative humidity:
maximum 80% up to 31°C decreasing linearly to 50% at 40°C
Altitude:
not exceeding 2000m
Electrical supply:
fluctuation not exceeding 10%
Overvoltage:
category II IEC60364-4-443
Pollution: degree
2
16 Specification
Case Size (mm)
Chamber Size
(mm)
Max
Temp
°C
Max
Power
kW
Radiant
Heating
Power
kW
Micro
Power
kW
Micro
Freq’y
MHz
H W D H W D
Volume
Litres
Max
Distributed
Load
kg
Net
Weight
kg
1600 12
9
2 2450
1090 910
830 +
95(door)
232 245 396
22
7.5 290
