Daikin RZQ Series FCQ20EVA Service Manual page 45

SiME281501E
4.2.7 General Electronic Expansion Valve Control
When cooling/heating, PI control of electronic expansion valve is conducted to keep heat exchanger outlet
subcooled degree constant in order to utilize outdoor unit heat exchanger fully.
SH = R4T - Te
[When slight wet operation]
Target heat exchanger outlet subcooled degree > Actual heat exchanger outlet subcooled degree
 The electronic expansion valve will close.
[When slight overheat operation]
Target heat exchanger outlet subcooled degree < Actual heat exchanger outlet subcooled degree
 The electronic expansion valve will open.
 The value of target heat exchanger outlet subcooled degree varies depending on change of discharge
pipe superheated degree of inverter compressor, etc.
4.2.8 "Automatic Operation Mode" Control (PMV Control)
When selecting "Automatic Operation Mode" with the remote controller, conducts the most comfortable
operation in which you do not feel too cool or too hot.
Outdoor air temperature
Indoor air temperature
Temperature set by remote controller
4.2.9 Outdoor Unit Fan Speed Control
 RZQ20/24LVA
Step
0
1
2
3
4
5
6
7
8
 RZQ36/45LVA, RZQ45/48MYL
Step
0
1
2
3
4
5
6
7
8
Function and Control
SH: Heat exchanger outlet subcooled degree
R4T: Suction pipe temperature (°C)
Te: Low pressure equivalent saturation temperature (°C)
Cooling
M1F
0 rpm
200 rpm
250 rpm
300 rpm
360 rpm
430 rpm
515 rpm
620 rpm
830 rpm
Cooling
M1F
0 rpm
250 rpm
400 rpm
285 rpm 250 rpm
360 rpm 325 rpm
445 rpm 410 rpm
545 rpm 510 rpm
660 rpm 625 rpm
850 rpm 815 rpm
Calculates and controls the
optimum target temperature
M2F M1F
0 rpm 0 rpm
0 rpm 250 rpm
0 rpm 285 rpm
335 rpm
395 rpm
470 rpm
560 rpm
660 rpm
842 rpm
Function Details
Heating
M1F
0 rpm
200 rpm
250 rpm
300 rpm
360 rpm
430 rpm
515 rpm
620 rpm
745 rpm
Heating
M2F
0 rpm
0 rpm
250 rpm
300 rpm
360 rpm
435 rpm
525 rpm
625 rpm
807 rpm
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