Daikin RZQ Series FCQ20EVA Service Manual page 50

Function Details
4.2.14 Inverter Protection by Radiation Fin Temperature
Restricts compressor operation upper limit frequency to prevent compressor from tripping due to radiation fin
temperature.
Normal operation
Inverter upper limit frequency
= Maximum frequency
4.2.15 Inverter Current Protection Control
Restricts compressor operation frequency to prevent compressor from tripping due to inverter overcurrent.
Inverter current
> Stepping down current
Stepping-down
4.2.16 Capacitor Discharging Control
Outputs non-phase waveform for heat exchanger to discharge for about 1 minute after operation OFF
(remote controller stop, stop due to error, compressor and outdoor unit fan motor stop with thermostat OFF in
the retry system).
41
Radiation fin temperature ≥ A˚C
Compressor frequency
+1 step/2 min.
RZQ20/24LVA
A°C 80°C
B°C 84°C
Normal operation
Compressor frequency
–1 step/6 sec.
The condition of inverter current < Stepping down
current continues for 2 minutes
Outdoor unit heat exchanger temperature
(liquid) ≥ Indoor heat exchanger
&
temperature
Outdoor unit heat exchanger temperature
(liquid) ≥ 25˚C
current AA
Outdoor unit heat exchanger temperature
(liquid) < Indoor unit heat exchanger
temperature
OR
Outdoor unit heat exchanger temperature
(liquid) < 25˚C
RZQ20/24LVA
A 19A
B 16.5A
Compressor frequency
–1 step/6 sec.
Fin temperature ≤ B˚C
lasts for 2 minutes
RZQ36/45LVA,
RZQ45/48MYL
84°C
81°C
Inverter upper limit frequency
= Maximum frequency
Compressor frequency
+1 step/2 min.
Stepping-down
current BA
RZQ36/45LVA
20A
16.5A
SiME281501E
RZQ45/48MYL
13A
11A
Function and Control