Daikin UATYA-B, Operation Manual

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Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
4.4.3 High discharge gas temperature alarm
The controller senses the exhaust gas temperature and, where this exceeds the set threshold, it manages the alarm and
stops the compressors featured in the circuit. To be more precise, if an inverter compressor is fitted, the controller tries to
reduce the exhaust temperature and the compressor speed, before the stop threshold is achieved, taking the compressor
envelope as reference.
The parameter involved is shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter Value UM Description
PAL50 110.0 °C Delivery gas high temperature alarm threshold
PAL51 30.0 °C Delivery high temperature alarm differential
PAL52 2 - Maximum number of alarms in one hour due to high delivery temperature
Alarm code
AL57 for circuit 1, compressor 1; AL58 for circuit 2, compressor 1; AL59 for
circuit 1, compressor 2; AL60 for circuit 2, compressor 2.
Reason for activation If the value measured by the temperature probe is >= PAL50
Reset
When the value measured by the temperature probe is <= than the difference between
PAL50 and PAL51
When the value detected by the temperature probe is back within the limit required by the
compressor envelope.
Reset mode Automatic, and becomes manual after PAL52 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 Alarms