81
Outdoor Unit Functions
Due to our policy of continuous product innovation, some specifications may change without notification.
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Manual Back Up for Inverter
Compressor (SE4)
The Manual Back Up function allows the system to operate if an
inverter compressor fails (defective compressor operation is halted),
manually backing up the compressor until it is serviced to an operat-
ing condition or replaced. It informs the outdoor unit microprocessor
that one compressor is not available for operation. It does not isolate
the refrigerant flow between the compressor and the piping system.
Error can be displayed every six (6) hours.
For use on both heat pump and heat recovery systems.
Turn No. 5 on the outdoor unit (with the malfunctioning compressor)
PCB DIP switch bank SW01 to ON.
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Select from “oFF’, “inv1”, “inv2”, and unit backup by using the SW03C
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Figure 31: Setting the Manual Back Up for Inverter Compressor
Function.
OTHER CONTROLS
Setting Optional Modes
Press the SW01D Reset Button one (1) time to reset PCB.
The Manual Back Up Function is set.
• The Manual Back Up for Inverter Compressor function is for temporary use only. Leaving a damaged compressor in an outdoor unit for an
extended period will lead to multiple compressor failures in the system.
•
Do not forget to turn this function OFF after the compressor is replaced.
The Manual Back Up for Inverter Compressor function requires the
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outdoor unit with the malfunctioning compressor.
Table 41: Setting Manual Back Up Function.
Settings Function
oFF (Default) Manual Back Up is Disabled. All Compressors are Operating Normally.
inv1 Compressor Number 1 Malfunctioning; Manual Back Up is Enabled.
inv2 Compressor Number 2 Malfunctioning; Manual Back Up is Enabled.
Unit Backup Unit Backup is Enabled.
Forced Oil Return (SE5, 01)
The Forced Oil Return function overrides LG’s Smart Oil Manage-
ment algorithm, replacing it with a timed oil return that initiates every
fifteen minutes when the sensor indicates the oil level is low. Use
the function in applications where oil return has been problematic, a
compressor failed due to low oil and the cause is unknown.
For use on both heat pump and heat recovery systems.
Turn No. 5 on the master outdoor unit PCB
DIP switch bank SW01 to ON.
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Figure 32: Setting the Forced Oil Return Function.
The Forced Oil Return function begins. PCB does not need reset.
Table 42: Setting Forced Oil Return Function.
Settings Function
oFF (Default) Forced Oil Return is Disabled.
01
Forced Oil Return is Enabled. Oil Return Occurs
Every Fifteen (15) Minutes When Low.
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