Malfunctions - Daikin CTXS09GVJU Service Manual

Control Specification

3.13 Malfunctions

3.13.1 Sensor Malfunction Detection
Sensor malfunction may occur either in the thermistor or current transformer (CT) system.
Relating to Thermistor Malfunction
1. Outdoor heat exchanger thermistor
2. Discharge pipe thermistor
3. Fin thermistor
4. Gas pipe thermistor
5. Outdoor air temperature thermistor
6. Liquid pipe thermistor
Relating to CT Malfunction
When the output frequency is more than 55 Hz (18 class), or 32 Hz (32 class) and the input current
is less than 1.25A (18 class), or 0.5A (32 class), carry out abnormal adjustment.
3.13.2 Detection of Overload and Over Current
Outline
In order to protect the inverter, detect an excessive output current, and for protecting compressor,
monitor the OL operation.
Detail
3.13.3 Insufficient Gas Control
Outline
1. Detecting by power consumption
If the power consumption is below the specified value and the frequency is higher than the
specified frequency, it is regarded as insufficient gas.
If power consumption is weak compared to normal operation when gas is insufficient, gas
insufficiency is detected by checking power consumption.
2. Detecting by discharge pipe temperature
If the discharge temperature is higher than the target discharge pipe temperature, and the
electronic expansion valve is fully open (450 pulses) more than the specified time, it is regarded as
insufficient gas.
Refer to Insufficient Gas on page 151 for details.
54
If the OL (compressor head) temperature exceeds 266°F, the compressor will be
interrupted.
If the inverter current exceeds 30 A, the compressor will be interrupted.
Insufficient gas zone
18 class : 55 Hz Frequency
32 class : 40 Hz
(R8366)
Gas insufficient
zone
(R1391)
SiUS12-814
Function and Control