Daikin CTX Series Service Manual page 50

DAMA-SM-21-003
For cooling mode:
Discharge pipe temperature + C°C (°F) < outdoor heat exchanger temperature
For heating mode:
Discharge pipe temperature + D°C (°F) < indoor heat exchanger temperature
When the thermistor is disconnected
When the disconnection is ascertained, the compressor continues operation for 9 minutes and
then stops.
If the compressor stops repeatedly, the system is shut down.
3.11.11 Target Discharge Pipe Temperature Control
The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger
temperature, and the electronic expansion valve opening is adjusted so that the actual
discharge pipe temperature becomes close to the target discharge pipe temperature. (Indirect
SH (superheating) control using the discharge pipe temperature)
The electronic expansion valve opening and the target discharge pipe temperature are adjusted
every A seconds. The opening degree of the electronic expansion valve is adjusted by the
following.
 Target discharge pipe temperature
 Actual discharge pipe temperature
 Previous discharge pipe temperature
Functions and Control
18
A 630.0
B 540.0
C (°C) 6.0
18
A 630.0
B 540.0
C (°F) 10.8
18
A 630.0
B 540.0
D (°C) 6.0
18
A 630.0
B 540.0
D (°F) 10.8
SC
(Subcooling)
A (seconds) 10 ~ 20 (depending on the model)
The target discharge pipe
temperature is set as to become
the target SH.
The inclination does not change
depending on the operating condition.
SH
(Superheating)
Control Specification
45