Daikin FTXS09DVJU Service Manual page 55

Control Specification (09/12 Class)
3.11.7 Control 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, cancel the target discharge pipe temperature control and
change the target opening of the electronic expansion valve according to the shift.
3.11.8 Target Discharge Pipe Temperature Control
Obtain the target discharge pipe temperature from the indoor and outdoor heat exchanger
temperature, and adjust the electronic expansion valve opening so that the actual discharge pipe
temperature become close to that temperature. (Indirect SH control using the discharge pipe
temperature)
Determine a correction value of the electronic expansion valve compensation and drive it according
to the deflection of the target discharge temperature and actual discharge temperature, and the
discharge temperature variation by the 20 sec.
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SiUS04-702
Function and Control