MPE
34
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RG66007169 - Rev 00
5 MICROPROCESSOR
CONTROL
5.7
SIGNALS AND ALARMS
LIST OF INDICATIONS
d1
Defrost status (
MPE H
only)
During the defrosting cycle, the message "d1" is displayed in turn with the inlet water temperature (Win).
dF1
Defrost error (
MPE H
only)
If the defrosting cycle ends because the maximum time has elapsed, not because the temperature threshold has been reached, the message "dF1" will
be displayed. To deactivate the message, it is necessary to carry out the alarm cancellation procedure or another successfully completed defrosting
cycle.
The alarm relay is not activated.
LIST OF ALARMS
When an alarm is triggered, the alarm code is displayed alternately with the inlet temperature (Win).
HP1: High pressure
The electronic control causes the compressor to shut down immediately, the alarm relay is activated and the display starts flashing. The alarm must be
manually reset.
LP1: Low pressure
The alarm causes the compressor to shut down immediately or prevents it from starting, the alarm relay is activated and the display starts flashing.
The alarm must be manually reset.
FL: Water differential pressure switch
The alarm causes the pump, compressor and fan to shut down, the alarm relay is activated and the display starts flashing. The alarm is automatically reset.
A1: Antifreeze
The alarm is triggered by the evaporator outlet water temperature sensor (Wout).
The alarm causes the compressor and fan to shut down immediately, the alarm relay is activated and the display starts flashing. The alarm must be manually
reset.
EPr, EPb: Eeprom error alarm
It indicates that a problem has occurred in the saving of parameters in the non-volatile memory of the unit (EEPROM). If the code shown is
EPr
, the unit
will continue to function until the next time the power supply is cut off. If the error is still present when the power supply is restored, the display will start
flashing with the digits
EPb
and the unit will not start.
The alarm is automatically reset.
E1, E2, E4: Sensor alarms
When a sensor alarm is triggered, the compressor, fans and pump are deactivated; the alarm relay is activated and the display starts flashing.
E1
Inlet water sensor;
E2
Outlet water sensor;
E4
pressure probe (only for
MPE
units with optional condensation control or
MPE H
).
The alarm is automatically reset.
ELS, EHS: Error due to high or low supply voltage
If the supply voltage is too low, the message ELS will appear; if it is too high EHS is displayed. In such conditions, the proper functioning of the unit is no
longer guaranteed. If the EHS alarm is tripped, the compressor, pump and fan will be shut down.
The alarm is automatically reset.
EL1: Error due to line "disturbance"
It appears if "strong noise" is present in the power supply.
5.7.1 ALARM RESET
When alarms are reset:
- the alarm relay is deactivated;
- the temperature shown on the display stops flashing;
- the alarm code will cease being displayed.
In the case of automatically reset alarms, this will occur as soon as the cause of the alarm is eliminated;
In the case of manually reset alarms, it is necessary press and together for 5 seconds.
If the cause of the malfunctioning persists, the alarm will again be signalled.
