LG ARUM072BTE5 Installation Manual page 133

Overall Defrost Operating in Low
Temperatures (Heating) (Fn22)
The Overall Defrost Operating in Low Temperatures function over-
rides LG's Intelligent Defrost algorithm, and defrosts first the lower
half of the coil, then followed by a full coil defrost. On multi-frame
systems, all frames are in defrost simultaneously. Defrost operation
occurs every three (3) hours, irrespective of need, whenever the
outdoor air temperature is <14ºF.
Used in locations where heavy snow fall is prevalent, or when a
small amount of ice build-up on the coil has a noticeable impact on
building comfort.
Overall Defrost Operating in Low Temperatures can also be used
with Fn4 - Overall Defrost, and Fn6 - Snow Removal Assist / Rapid
Defrost.
For use on both heat pump and heat recovery systems.
Table 58: Setting the Overall Defrost Operating in Low Temperatures
(Heating).
Settings Overall Entrance for Low Ambient Defrost
oFF (Default)
Setting
Base Pan Heater (Optional)
Function (Fn23)
Informs the master outdoor unit microprocessor
an optional field-installed base pan heater (sold
separately) is installed in the outdoor unit. Select-
ing to engage this option should only be done if a
properly sized third-party heater is in place to keep
the bottom surface of the outdoor unit >32°F.
The microprocessor will power outdoor unit PCB
terminal "CN25_Basepan Heater" when at least
one (1) compressor in the frame is operating, the
outdoor air temperature is <39ºF, and either the
following conditions occur:
1. Outdoor unit is operating in heating.
2. Outdoor unit is in defrost.
The controller will shut off base pan heating opera-
tion when the outdoor air temperature rises >39ºF,
or when all compressors stop operating.
For use on both heat pump and heat recovery
systems.
On multi-frame systems, it is possible for one (1) or more frame(s) to be operating in heating, and have another frame operating in cooling.
No
Yes
Setting the Base Pan Heater 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
Select the "Fn23" function by using the SW03C forward ►button and the SW02C
Select from "oFF" or "on" options by using the SW03C forward ►button and the SW02C
Table 59: Setting the Base Pan Heater Function.
Settings
oFF (Default)
on
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PRE-COMMISSIONING
Setting the Optional Modes
Setting the Low Temperatures Defrost Function (Heating).
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 "Fn22" function by using the SW03C forward ►button and
the SW02C backward ◄ button, and then press the SW01C
Overall Defrost Operating in Low Temperatures (Heating) is set.
PCB does not need reset.
backward ◄ button, and then press the SW01C confirm ● button.
backward ◄ button, and then press the SW01C confirm ● button.
backward ◄ button, and then press the SW01C confirm ● button.
The Base Pan Heater Operation Function is set.
PCB does not need reset.
Base Pan Heater Kit Installed
No
Yes
● button.
confirm ● button.
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