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8 Maintenance
The controller does not require any maintenance. It does not have any
fuses so, if brief voltage spikes occur, the refrigeration system will not
stop operating for a prolonged period. Once the disturbance has
passed, the controller will automatically start up again.
Cleaning the housing: Only a dry anti-static cloth may be used to wipe
clean all plastic parts. Do not use water or cleaning agents containing
solvents!
9 Alarm messages
If an alarm occurs, the alarm output will be activated and on the
display a code will alternate with the cold store temperature.
Display Meaning
AL1 Program memory data loss.
The preset values will be used as an emergency program.
The setpoint value will be set to +4 or –18 °C,
depending on the selection of DIP switch 1.
AL2 Limit value (=setpoint value +E03) at sensor T1
exceeded and delay time E04 elapsed.
AL3 The sonsor temperature at sensor T1 is above
50 °C or below –55 °C.
AL4 The specified setpoint value is outside
the limits E12 and E13
AL5 Cold store temperature sensor T1 – short
circuit or break in wiring. Compressor switches
as a function of parameter E17.
AL6 Evaporator temperature sensor T2 – short
circuit or break in wiring.
Safety times are used, for the fan run-on function
the fan is controlled with the compressor by the
evaporator fan control E11 automatically
switching from 3 to 1.
☛ After sensor T2 has been repaired,
E11 must be reset manually from 1 to 3.
AL7 For PCR-300RC only: Real-time clock faulty,
switching over to interval defrosting (interval = 4 hours)!