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MULTI V 5 Outdoor Unit Service Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
OTHER CONTROLS
Setting Optional Modes
Forced Defrost (SE6, dEF)
The Forced Defrost function overrides LG’s Intelligent Defrost algo-
rithm when the outside ambient air temperature is <14ºF, occurring
every three (3) hours irrelevant of need. Use the function when
defrost at low ambient temperatures does not completely clear the
coil, and the frost that remains impacts comfort levels. It can also be
used on installations where the outdoor unit heating capacity needs
to be optimized at all times during low ambient operation to maintain
comfort.
On single outdoor unit systems, Forced Defrost will defrost the lower
half of the coil for four (4) minutes, followed by a twenty (20) minute
full coil defrost (total defrost cycle time is twenty-four [24] minutes).
On multi-frame systems, the entire coil on each frame will defrost
concurrently (total system defrost cycle time is twenty [20] minutes).
For use on both heat pump and heat recovery systems.
Forced Defrost can also be used with Fn4 - Overall Defrost, Fn6
- Snow Removal Assist / Rapid Defrost (oP2 or oP3), and Fn22 -
Overall Defrost Operating in Low Temperatures. Combining all of
these functions will result in the most aggressive defrost capability.
Figure 33: Setting the Forced Defrost Function.
Table 43: Setting Forced Defrost Function.
Settings Function
oFF (Default) Forced Defrost is Disabled.
dEF
Forced Defrost is Enabled. Oil Return Occurs Every
Three (3) Hours Irrelevant of Need.
Turn No. 5 on the master outdoor unit PCB
DIP switch bank SW01 to ON.
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The Forced Defrost function begins. PCB does not need reset.
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