Daikin FTXL20G2V1B Service Manual page 59

SiENBE04-925_A
3.11.1 Fully Closing with Power ON
The electronic expansion valve is initialized when turning on the power. The opening position is
set and the pressure equalization is developed.
3.11.2 Pressure Equalization Control
When the compressor is stopped, the pressure equalization control is activated. The electronic
expansion valve opens, and develops the pressure equalization.
3.11.3 Opening Limit
Outline A maximum and minimum opening of the electronic expansion valve are limited.
Detail
Maximum opening (pulse)
Minimum opening (pulse)
The electronic expansion valve is fully closed when cooling operation stops, and is opened at
fixed degree during defrosting.
3.11.4 Starting Operation Control
The electronic expansion valve opening is controlled when the operation starts, and prevents
the superheating or liquid compression.
3.11.5 High Discharge Pipe Temperature
When the compressor is operating, if the discharge pipe temperature exceeds a certain value,
the electronic expansion valve opens and the refrigerant runs to the low pressure side. This
procedure lowers the discharge pipe temperature.
3.11.6 Disconnection of the Discharge Pipe Thermistor
Outline
The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe
temperature with the condensation temperature. If the discharge pipe thermistor is
disconnected, the electronic expansion valve opens according to the outdoor temperature and
the operation frequency, and operates for a specified time, and then stops.
After 3 minutes of waiting, the operation restarts and checks if the discharge pipe thermistor is
disconnected. If the discharge pipe thermistor is disconnected, the system stops after operating
for a specified time.
If the disconnection is detected 4 ~ 5 times (depending on the model) in succession, then the
system is shut down. When the compressor runs for 60 minutes without any error, the error
counter is reset.
Function and Control
20 class 25 class
480 450
52 60
Control Specification
35 class
480
54
45