Outdoor Fan Control; Liquid Compression Protection Function - Daikin 3MKS50E3V1B Service Manual

SiBE121135
4.8

Outdoor Fan Control

1. Fan ON control to cool down the electrical box
The outdoor fan is turned ON when the electrical box temperature is high while the compressor
is OFF.
2. Fan OFF control during defrosting
The outdoor fan is turned OFF while defrosting.
3. Fan OFF delay when stopped
The outdoor fan is turned OFF 60 seconds after the compressor stops.
4. Fan speed control for pressure difference upkeep
The rotation speed of the outdoor fan is controlled for keeping the pressure difference during
cooling operation with low outdoor temperature.
5. Fan control when the number of heating room decreases
When the outdoor temperature is more than 10°C, the fan is turned off for 30 seconds.
6. Fan speed control during forced operation
The outdoor fan is controlled as well as normal operation during the forced operation.
7. Fan speed control during POWERFUL operation
The rotation speed of the outdoor fan is increased during the POWERFUL operation.
8. Fan speed control during indoor / outdoor unit quiet operation
The rotation speed of the outdoor fan is reduced by the command of the indoor / outdoor unit
quiet operation.
9. Fan ON/OFF control when operation starts / stops
The outdoor fan is turned ON when the operation starts. The outdoor fan is turned OFF when
the operation stops.
4.9

Liquid Compression Protection Function

Outline
In order to obtain the dependability of the compressor, the compressor is stopped according to
the outdoor temperature and temperature of the outdoor heat exchanger.
Detail
The compressor turns off under the conditions that the system is in cooling operation and
outdoor temperature is below –12°C.
Function and Control
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.
Operation stops depending on the outdoor temperature
Control Specification
115