Outdoor Fan Control; Liquid Compression Protection Function - Daikin RX-W Series Service Manual

SiUS092230EA
5.9

Outdoor Fan Control

1. Fan ON control to cool down the electrical box
2. Fan OFF control during defrosting
3. Fan OFF delay when stopped
4. Fan speed control for pressure difference upkeep
5. Fan speed control during forced operation
6. Fan speed control during POWERFUL operation
7. Fan speed control during indoor unit quiet/QUIET OUTDOOR UNIT operation
8. Fan ON/OFF control when operation (cooling, heating, dry) starts/stops

5.10 Liquid Compression Protection Function

Outline
The compressor stops according to the outdoor temperature for protection.
Details Operation stops depending on the outdoor temperature.
The compressor turns off under the conditions that the system is in cooling operation and the
outdoor temperature is below 0°C (32°F).
However, the cooling operation range can be extended to the lowest temperature of –20°C (–4°F)
by changing facility setting. Refer to page 226 for details of facility setting.
Part 4 Functions and Control
The outdoor fan is turned ON when the electrical box temperature is high while the compressor
is OFF.
The outdoor fan is turned OFF while defrosting.
The outdoor fan is turned OFF 60 ~ 70 seconds after the compressor stops.
The rotation speed of the outdoor fan is controlled for keeping the pressure difference during
cooling operation with low outdoor temperature.
 When the pressure difference is low, the rotation speed of the outdoor fan is reduced.
 When the pressure difference is high, the rotation speed of the outdoor fan is controlled as
well as normal operation.
The outdoor fan is controlled as well as normal operation during forced operation.
The rotation speed of the outdoor fan is increased during POWERFUL operation.
The rotation speed of the outdoor fan is reduced by the command of the indoor unit quiet/QUIET
OUTDOOR UNIT operation.
The outdoor fan is turned ON when the operation starts. The outdoor fan is turned OFF when
the operation stops.
Control Specification
89