Service documentation series KB/KBF
BB / JTU 25.06.2000
Chapter 1
Trouble Shooting
KB/KBF
Fault description Fault cause
No or to low cold output
x Ambient temperature 22°C? For each Kelvin that the ambient
temperature is above 22°C, the cold output will be approx. 1.5K
lower.
x Compressor switched on? Warm air must be present on the left of
the unit (condenser). Copper pipe between compressor and
condenser must be hot.
x KB: Measure the cold output on the RD2.1 controller
x KBF: Check the operation of the Solid valve
x Condenser is soiled
x Air-Supply troubled
x In normal operation, the pipe of the pressure side had to heat up
to 50°C
Æ
70°C. If not, there is a fault at the compressor.
x If everything is in order electrically, it is likely that the cold gas has
leaked. Critical points are all bends, the condenser (soldering
joint) or an old chamber (rock wool).
Condensation at Suck Side of
the Compressor
x There is an overfill of the refrigerant
built-in a interface-card to SM-
humidity controller
see separate check list
Humidity too less
(D2 controller)
see separate check list
RH% sporadically to high In the older KBF’s mechanical relays (K3) were fitted instead of
semiconductor relays (K3/K4). Due to the contacts sticking, the
electrodes were charged for too long, causing excessive humidity
fluctuations. Change it and fit in semiconductor relay
Fault on the humidity board
EM2
A red LED is located on the humidity board, which can indicate the
following faults:
x Red LED flashes – the humidity control has a fault. Switch the unit
off and on again to check again – change EM2-Board
x Red LED ON, the max. cylinder level has been reached. The inlet
valve is blocked for approx. 30 sec.
Fault on the humidity board L3 Three LED are located on the humidity board. The LED are showing
to the bottom of the I-box. The LED are to see with a look under the
board respectively with a sheet paper (reflections) respectively to
make it visible at a mirror. The LED shows following information.
x Green LED the humidity board is in operation
x Yellow LED steam production
x Red LED flashes – the humidity control has a fault. Switch the unit
off and on again to check again – change L3-Board
Red LED ON, the max. cylinder level has been reached. The inlet
valve is blocked for approx. 30 sec.
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