Daikin 4MXL-T Series Service Manual page 126

Control Specification
4.13.11 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 15 seconds. The target discharge pipe temperature is controlled by indoor heat exchanger
temperature and outdoor heat exchanger temperature. 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
120
SC
(Subcooling)
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)
SiUS121827E
(R23014)
Part 4 Functions and Control