111
Service manual
Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
4.5.3 Compressor inverter alarm
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
PAL14
5
s
Alarm delay at start-up
PAL15
3
s
Alarm delay at steady state
PAL16
2
-
Max. number of alarms in one hour
PAL17
0
-
Enable alarm when compressors off
PAL24
10
s
Alarm delay upon activation
Inverter blocked
Alarm code
AL51
Reason for activation
Alarm via serial signal from inverter
If “PAL17” = 0 (no compressor activation request), the alarm is active after the delay set in
“PAL15”
If “PAL17” = 1 (with compressor activation request), the alarm is active after the delay set in
“PAL14” upon start-up and the sum of “PAL14” and “PAL15” at steady state
Reset
Upon resetting of the alarm coming from inverter
Reset mode
Automatic; switches to manual after the trip occurrences per hour set in “PAL16”
Alarm icon
Flashing
AlarmLog
Yes
Alarm relay
Based on “alarm.conf” file
Devices
Behaviour in the event of an alarm
Compressors
Involved compressor stop
The other devices
They follow their control
Communication error
Alarm code
AL166
Reason for activation
Communication error with inverter after time setpoint in “PAL24”
Reset
As soon as communication is restored
Reset mode
Automatic
Alarm icon
Flashing
AlarmLog
Yes
Alarm relay
Based on “alarm.conf” file
Devices
Behaviour in the event of an alarm
Compressors
Involved compressor stop
The other devices
They follow their control
In refrigerant circuits featuring an inverter compressor and an on-off compressor, when the inverter compressor resumes
operation after an alarm while the on-off compressor is in operation, the controller resets the demand to the on-off compres
-
sor and stops it, after which it initiates a start-up procedure prioritising the inverter compressor.
4.5.4 Compressor thermal overload switch alarms
Alarm code
AL18..AL21
Reason for activation
The alarm is detected after the compressor is switched on
It is detected when the relevant digital input is open
Reset
When the digital input closes
Reset mode
Always manual; after repeated occurrences, only the service personnel can reset the alarm
Alarm icon
Flashing
AlarmLog
Yes
Alarm relay
Based on “alarm.conf” file
Devices
Behaviour in the event of an alarm
Compressor in alarm
Always switched off
Compressors not in alarm
According to case, they follow their control or
all compressors of the same circuit are switched off
Ventilation
If in common with other compressors, it follows its control, otherwise it stops
Other devices
They follow their control
4 Alarms
Summary of Contents for UATYA-B
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