Daikin UATYA-B, Operation Manual

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Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
4.4 Circuit alarms
The circuit alarms occur only on the compressors of the circuit involved.
4.4.1 High-pressure alarms
The delivery pressure in each refrigerant circuit is controlled by safety pressure switches and by pressure transducers.
The parameters involved are shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter Value UM Description
PAL11 39.00 bar High pressure alarm threshold
PAL12 4.00 bar High pressure alarm differential
PAL13 0 - Maximum number of alarms in one hour due to high pressure
Pressure switch high pressure alarm
Alarm code AL6 for circuit 1; AL7 for circuit 2
Reason for activation
With the unit running, when the digital input opens to which the relevant safety devices are
connected
Reset When the relevant digital input closes
Reset mode Manual
Alarm icon Flashing
AlarmLog Yes
Alarm relay Based on “alarm.conf” file
Devices Behaviour in the event of an alarm
Compressors Only the compressors of the circuit involved are switched off
The other devices They follow their control
High pressure alarm from transducers
Alarm code AL10 for circuit 1 and AL11 for circuit 2
Reason for activation With unit running, if the value measured by the pressure probe is >=PAL11
Reset When the value measured by the pressure probe is <= (PAL11 - PAL12)
Reset mode Automatic, and becomes manual after PAL13 occurrences/hour
Alarm icon Flashing
AlarmLog Yes
Alarm relay Based on “alarm.conf” file
Devices Behaviour in the event of an alarm
Compressors Only the compressors of the circuit involved are switched off
The other devices They follow their control
4.4.2 Low pressure alarms
The intake pressure in each refrigerant circuit is controlled by low pressure switches and transducers.
The parameters involved are shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter Value UM Description
PAL1 15 s Low pressure alarm delay on starting of the circuit
PAL2 4.5 bar Low pressure alarm threshold during operation
PAL3 2.0 bar Low pressure alarm differential during operation
PAL4 5 - Maximum number of alarms in one hour due to low pressure
PAL10 5 s Low pressure alarm delay at full operating speed
4 Alarms