Malfunctions - Daikin SUPER MULTI NX G Series Service Manual

Control Specification
Detail
Detect Disconnection
When the starting control (630 seconds) finishes, and the 9-minute timer for the compressor
operation continuation is not counting time, the following adjustment is made.
1. When the operation mode is cooling
2. When the operation mode is heating
Adjustment when the thermistor is disconnected
When the compressor stops repeatedly, the system is down.
3.12.11Control when frequency is changed
When the target discharge pipe temperature control is active, if the target frequency is changed for
a specified value in a certain time period, the target discharge pipe temperature control is canceled
and the target opening of the electronic expansion valve is changed.

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 temperature thermistor
6. Liquid pipe thermistor
Relating to CT Malfunction
When the output frequency is more than
adjustment is carried out.
3.13.2 Detection of Overcurrent and Overload
Outline In order to protect the inverter, an excessive output current is detected, the OL temperature is
observed to protect the compressor.
 If the inverter current exceeds 30 A, the system shuts down the compressor.
Detail
 If the OL (compressor head) temperature exceeds 120 ~ 130°C (216 ~ 266°F), the compressor
57
When the discharge pipe temperature is lower than the outdoor heat exchanger temperature,
the discharge pipe thermistor disconnection is ascertained.
When the discharge pipe temperature is lower than the maximum temperature of operating
room heat exchanger, the discharge pipe thermistor disconnection is ascertained.
18 class
(Hz) 55
(A) 1.25
stops.
Hz, and the input current is less than
24/32 class
32
0.5
SiUS12-928_A
A, abnormal
Function and Control