LG AVNH-EL Service Manual page 130

Outdoor Units
2.2 Low ambient control
2.2.1 The outline of Low ambient control.
: The control device makes [the outdoor_unit] operate the Cooling mode in low-temperature condition with-
out overloading the comp.
If the Temp. of outdoor_unit goes down, The Evaporator will start freezing and the liquid refrigerant will
flow inside the Compressor.
For preventing the situation,the Fan Speed of outdoor unit is reduced to 40% lower than Full speed
according to the piping Temp. of outdoor unit.
This operation makes the CYCLE Temp to rise (=FAN control contents).
2.2.2 The particular contents of Low ambient control process
- The fan of outdoor_unit operates at Full speed when the COMP is On for 3 seconds(OPTION)
- The fan of outdoor_unit control is controlled according to the Temp.of outdoor_unit and the pipe temp.of
outdoor_unit.(OPTION)
- If the established base Temp.is more than PRESET TEMPERATURE, The fan of outdoor_unit will be
operated at HIGH Speed.
- If the established base Temp.is lower than PRESET TEMPERATURE, The outdoor_unit will be operated
at Low ambient control.
(If The LOW AMBIENT function isn't used, the outdoor unit fan will be operated at 2 conditions
(STOP,HIGH).
PRESET
(OPTION)
FAN ON °C
(OPTION)
FAN OFF °C
(OPTION)
The fan of outdoor
134 Universal System Air Conditioner
The Temp. of outdoor and
the pipe Temp. of outdoor
Setting fan
Off
HIGH
speed
Setting fan Setting fan
Off
speed speed