LG ARUM072BTE5 Installation Manual page 127

(Overall) Defrost Function (Fn4)
Overall Defrost Function allows the outdoor unit to operate in either
full frame (overall) defrost or in partial defrost (or partial frame de-
frost in multi-frame systems). Overall defrost is when the entire coil
is in defrost per cycle. Partial defrost is when half the coil (or one
frame in a multi-frame system) is in defrost first, then the other half
of the coil (or another frame in a multi-frame system) is in defrost
next, then the first half of the coil is in defrost again, per cycle. Use
in locations where relative humidity remains high during the heating
season, or in applications where it has proven that operating all
the outdoor units in defrost at the same time saves energy, and / or
shortens the defrost time without impacting comfort levels.
Can also be used with Fn6 - Rapid Defrost, and Fn22 - Overall
Defrost Operating in Low Temperatures (Heating).
For use on both heat pump and heat recovery systems.
Table 49: Setting the Overall Defrost Function.
Options
on System Operates in Full Frame (Overall) Defrost
System Operates in Partial Defrost
oFF
(or Partial Frame Defrost in Multi-Frame Systems)
Outdoor Unit Addressing Function
(Fn5)
Use this function to set the system address of the outdoor unit when
a central controller has been installed. If multiple systems (master
units) are wired to the central control bus, each system is assigned
to a unique outdoor unit address. If not properly addressed, a com-
munication error could occur or one (1) or more of the systems.
For use on both heat pump and heat recovery systems.
• The central controller must be installed first before setting the
outdoor unit address.
• A trained LG service provider must set this function during system
installation.
Function
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Setting the Optional Modes
Setting the Overall 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 "Fn4" function by using the SW03C forward ►button and
the SW02C backward ◄ button, and then press the SW01C
confirm ● button.
Select from "on" through "oFF" options (see table) by using the
SW03C forward ►button and the SW02C backward ◄ button,
and then press the SW01C confirm ● button.
Defrost Mode is set. PCB does not need reset.
A trained LG service provider must set this function during system
installation.
Setting the Outdoor Unit Address 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 ● button.
Select the "Fn5" function by using the SW03C forward ►button and
the SW02C backward ◄ button, and then press the SW01C
confirm ● button.
Select from 0 (Default) through 254 by using the SW03C forward
►button and the SW02C backward ◄ button, and then press
the SW01C confirm ● button.
Outdoor Unit Address is set. PCB does not need reset.
● button.
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