Malfunctions - Daikin FTXS30HVJU Service Manual

SiUS04-924

3.12 Malfunctions

3.12.1 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. Outside air thermistor
3.12.2 Detection of Overload and Overcurrent
Outline
In order to protect the inverter, detect an excessive output current, and for protecting compressor,
monitor the OL operation.
 If the OL (compressor head) temperature exceeds 266°F(130°C, depending on the
Detail
 If the inverter current exceeds 30A, the compressor is interrupted.
3.12.3 Insufficient Gas Control
Outline There are 2 ways of control to detect insufficient gas.
I Detecting by DC current
If the DC current is below the specified value and the frequency is higher than 40 Hz, it is regarded
as insufficient gas.
The DC current is weak compared to the normal operation when gas is insufficient, and gas
insufficiency is detected by checking the DC current.
II 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 more than the specified time, it is regarded as insufficient
gas.
Refer to Insufficient Gas on page 102 for details.
40
model), the compressor is interrupted.
Insufficient gas zone
40 Hz Frequency
(R9315)
Gas insufficient
zone
(R1391)
Control Specification
Function and Control