JULABO LH 85 High Dynamic Temperature System - Manual (Page 73)

73
11.5. Additional error messages LH85
Error messages Description
-27 WARNING:
COMPRESSOR STAGE 1
OVERPRESSURE
The compressors of both stages were switched off.
The high pressure controller in 1
st
stage measures a too
high pressure. As soon as the pressure in stage 2 reaches
the lower switching point, the compressors are switched on
again delayed.
-28 WARNING:
COMPRESSOR STAGE 1
OVERTEMP
The compressor of both stages were switched off.
The exit temperature of stage 1 is too high. As soon as the
temperature reaches the lower switching point, and – as
second condition – the pressure proportions allow it, the
compressors are switched on again delayed.
-29 COMPRESSOR STAGE 1 FIVE
TIMES PER DAY IN OVERTEMP
The exit temperature of stage 1 is too high. For this reason
the compressors of both stages have already been switched
off 4 times.
(see warning CODE 28).
After a cool-down phase the alarm status can be cancelled
by switching off and on again at the mains switch, and the
unit is ready to operate again.
In order to avoid the destruction of the compressor, the
refrigerant cycle of 1
st
stage should be checked by a
specialist first.
-30 COMPRESSOR STAGE 1
FAILURE IN TEMPERATURE
MEASUREMENT SYSTEM
The temperature sensor for the exit temperature of stage 1
is bypassed, or there is a line interruption.
Have the repair done by a specialist. .
-42 WARNING:
COMPRESSOR STAGE 2
ABOVE HIGH PRESSURE
Already for a period of 5 minutes the pressure in stage 2
(high pressure side) is too high. The cooling system works
at its limit. If the pressure falls below a factory-made value
for at least 100 seconds, the warning expires again.
-43 WARNING:
COMPRESSOR STAGE 2
OVERPRESSURE SWITCH
HIGH PRESSURE SIDE
The compressor of stage 2 was switched off.
The high pressure controller in stage 2 (high pressure side
at approx. 24 bar) measures a too high pressure. As soon
as the pressure reaches the switching point again, the
compressor is switched on and the warning expires again.
-44 WARNING:
COMPRESSOR STAGE 2
OVERPRESSURE SWITCH
LOW PRESSURE SIDE
The compressor of stage 2 was switched off.
The high pressure controller T0 in stage 2 (low pressure
side at approx. 7 bar up to 9,5 bar) measures a too high
pressure. As soon as the pressure reaches the lower
switching point again, the compressor is switched on, and
the warning expires again.