LG ARUM072BTE5 Installation Manual page 129

Low Ambient Kit Function (Fn9)
The function notifies the outdoor unit that a low ambient kit is
installed. Use in zones that will need cooling when outdoor ambient
temperatures fall below 5ºF.
For use on both heat pump and heat recovery systems. Optional low
ambient baffle kits allow for Multi V 5 outdoor unit operation down
to -9.9°F. When used with heat recovery operation, low ambient
cooling to -9.9°F is possible only when all indoor units are operating
in cooling mode. The low ambient wind baffle kit does not impact
synchronous operating range.
See the Low Ambient Kit Installation Manual on www.lghvac.com for
installation, etc., information.
Table 51: Setting the Low Ambient Kit Function.
Settings
on Low Ambient Kit is Installed
oFF Default - Low Ambient Kit is Not Installed
High Efficiency Function (Cooling
Operation) (Fn10)
High Efficiency Function (Cooling Option) increases compressor
capability, while reducing the target low pressure, to cool at high am-
bient temperatures. The function increases compressor operation,
so energy use may also rise. Use for cooling dominant installations,
and on both heat pump and heat recovery systems.
Always verify the refrigerant charge is correct before using this function.
Table 52: Setting the High Efficiency Function (Cooling Operation).
Settings
on High Efficiency Function (Cooling Operation) Selected
oFF
Function
Function
Default
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Setting the Optional Modes
Setting the Low Ambient Kit Function.
Turn No. 5 on the master outdoor unit PCB DIP
switch bank SW01 to ON.
Select the "Func" mode by using the SW03C forward ►button and the
SW02C backward ◄ button, and then press the SW01C confirm
Select the "Fn9" function by using the SW03C forward ►button and
the SW02C backward ◄ button, and then press the SW01C
confirm ● button.
Select from "on" or "oFF" by using the SW03C forward ►button and
the SW02C backward ◄ button, and then press the SW01C
confirm ● button.
The Low Ambient Kit function is set. PCB does not need reset.
Setting the High Efficiency Function (Cooling Operation).
Turn No. 5 on the master outdoor unit PCB
DIP switch bank SW01 to ON.
Select the "Func" mode by using the SW03C forward ►button and
the SW02C backward ◄ button, and then press the SW01C
confirm ● button.
Select the "Fn10" function by using the SW03C forward ►button and
the SW02C backward ◄ button, and then press the SW01C
confirm ● button.
Select from "oFF" or "on" options by using the SW03C forward
►button and the SW02C backward ◄ button, and then press
the SW01C confirm ● button.
Press the SW01D Reset Button one (1) time to reset PCB.
The High Efficiency Function in Cooling Operation is set.
● button.
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