Daikin RZQ Series FCQ20EVA Service Manual page 37

SiME281501E
4.1.3 Draft Avoidance Control 2 (FCQ)
When hot start is canceled or when cold air prevention control is finished, if the fan speed is set to "H," the fan
turns at L speed for a certain amount of time, thus avoiding draft while the flap is moving.
cold air prevention
4.1.4 Airflow Rate Shift Control
Tc: High pressure equivalent saturation temperature (°C)
The airflow rate of an indoor unit is varied to prevent shutdown due to a rise in the high pressure level.
(Airflow rate at heating operation)
ON condition Tc  58.8°C
Reset condition Tc < 50°C
Note that the airflow rate is varied for a setting time when the thermostat is ON.
4.1.5 Freeze-up Prevention Control
The thermostat turns OFF under the following temperature conditions to prevent freezing of the indoor unit
heat exchanger.
 The electronic expansion valve is controlled to maintain the indoor unit heat exchanger temperature above
0°C.
 The outdoor unit fan speed is reduced to prevent freeze-up prevention control from activating during
cooling operation under low outdoor air temperature. (For details, see the section on cooling operation
under low outdoor air temperature.)
Function and Control
H
L
FAN
OFF or LL
Setting
Flap
Po0
Cancel
HOT start,
Indoor unit heat exchanger temperature
Freeze-up prevention control
Reset after 10 continuous minutes
7˚C
Thermostat OFF after
40 cumulative minutes
–1˚C
Thermostat OFF after 1 continuous minute
from 8 minutes after starting
–5˚C
5 sec.
Cancel of hot start or cold air
prevention control.
Function Details
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