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Outdoor Unit Functions
Due to our policy of continuous product innovation, some specifications may change without notification.
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All Indoor Unit Cooling Operation (Fd8) or All Indoor Unit Heating Operating
(Fd9)
Fault Detection and Diagnosis (FDD [Fd]) modes are part of LG’s on board service algorithms that provide system operation insight when
LGMV software is not used. To record or save any data, LGMV or a recording saving data module must be installed. Fd codes can also be
used for commissioning, or to troubleshoot a problem on an existing system. The results provided by running an Fd mode must not be con-
sidered definitive proof that a system is properly operating. Fd code must not be left on without an LG trained service provider approving and
guiding its use.
Both the All Indoor Unit Cooling (Fd8) and All Indoor Unit Heating (Fd9) modes force the entire system (outdoor units and indoor units) to op-
erate in full blast cooling or full blast heating. Room temperatures and setpoints are ignored. Use these modes for commissioning to provide
an hour of data a start up, and / or to test operation in seasons opposite of when the system is installed (i.e., if the system is installed in the
summer, set it to Fd9 to test how the system would operate in heating during the winter months).
OTHER CONTROLS
Setting Optional Modes
The All Indoor Unit Cooling or All Indoor Heating function, as well as
other FDD algorithm could take up to forty (40) minutes to complete,
depending on the number of indoor units connected to the system.
Function Code Default Setting
All Indoor Unit Cooling Operation Fd8, cooL oFF on
All Indoor Unit Heating Operation Fd9, hEAt oFF on
Turn No. 5 on the master outdoor unit PCB DIP switch bank SW01 to
ON.
6HOHFWWKH³)GG´PRGHE\XVLQJWKH6:&IRUZDUGŹEXWWRQDQGWKH
6:&EDFNZDUGŻEXWWRQDQGWKHQSUHVVWKH6:&FRQILUP
ƔEXWWRQ
Select the “Fd8” All Indoor Unit Cooling or “Fd9” All Indoor Unit Heating
IXQFWLRQE\XVLQJWKH6:&IRUZDUGŹEXWWRQDQGWKH6:&
EDFNZDUGŻEXWWRQDQGWKHQSUHVVWKH6:&FRQILUPƔ
button.
Depending on the function chosen, “cooL” or “hEAt” will flash on the
SSD for several minutes.
Figure 9: Setting the All Indoor Unit Cooling (Fd8) or All Indoor Unit
Heating (Fd9) Function.
Table 22: All Indoor Unit Cooling or All Indoor Unit Heating Function
Settings.
The system will switch to standby mode as indicated by “stby” flashing
on the SSD for several minutes.
The system will then change to All Indoor Unit Cooling or All Indoor
Unit Heating as indicated by “6000” appearing on the SSD. The
number is a sixty (60) minute countdown displayed in minutes
and seconds. Compressor start can also be heard.
All Indoor Unit Cooling or All Indoor Unit Heating function will
automatically stop.
Turn No. 5 on the master outdoor unit PCB DIP switch bank SW01 to
2))DQGSXVKWKH6:&FRQILUPƔEXWWRQWRUHVHWWKHV\VWHP
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