70
MUL
TI 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.
High Efficiency Function (Cooling
Operation) (Fn10)
High Efficiency Function (Cooling Operation) increases compressor
capability so the system can cool at high ambient temperatures. It
automatically reduces the target low pressure as the outdoor ambi-
ent temperatures rises.
The function increases compressor operation, so net energy use will
also rise.
Use for cooling-dominant installations, and on both heat pump and
heat recovery systems.
Always verify the refrigerant charge is correct before using this function.
Figure 19:
6HWLJK(I¿FLHQF\)XQFWLRQ&RROLQJ2SHUDWLRQ
Turn No. 5 on the master outdoor unit PCB
DIP switch bank SW01 to ON.
6HOHFWWKH³)XQF´PRGHE\XVLQJWKH6:&IRUZDUGŹEXWWRQDQG
WKH6:&EDFNZDUGŻEXWWRQDQGWKHQSUHVVWKH6:&
FRQILUPƔEXWWRQ
6HOHFWWKH³)Q´IXQFWLRQE\XVLQJWKH6:&IRUZDUGŹEXWWRQDQG
WKH6:&EDFNZDUGŻEXWWRQDQGWKHQSUHVVWKH6:&
FRQILUPƔEXWWRQ
Select from “oFF” or “on” options by using the SW03C forward
ŹEXWWRQDQGWKH6:&EDFNZDUGŻEXWWRQDQGWKHQSUHVV
WKH6:&FRQILUPƔEXWWRQ
Press the SW01D Reset Button one (1) time to reset PCB.
The High Efficiency Function in Cooling Operation is set.
Settings
Function
oFF (Default)
High Efficiency Function (Cooling Operation) Is Not
Selected
on
High Efficiency Function (Cooling Operation) Selected
Table 30:
6HWLJK(I¿FLHQF\)XQFWLRQ&RROLQJ2SHUDWLRQ
Low Ambient Kit Function (Fn9)
The function notifies the outdoor unit that a low ambient kit is
installed. Use in zones that will need cooling when outdoor ambient
temperatures fall below 5ºF.
Optional low ambient baffle kits allow for Multi V 5 outdoor unit
operation down to -9.9°F. When used with heat recovery operation,
low ambient cooling to -9.9°F is possible only when all indoor units
are operating in cooling mode. Also when used with heat recovery
systems, if one (1) or more indoor units are in heating, minimum
cooling cycle ambient temperature is 14°F (low ambient wind baffle
kit does not impact synchronous operating range).
For use on both heat pump and heat recovery systems.
See the Low Ambient Kit Installation Manual on www.lghvac.com for
installation, etc., information.
Turn No. 5 on the master outdoor unit PCB DIP
switch bank SW01 to ON.
6HOHFWWKH³)XQF´PRGHE\XVLQJWKH6:&IRUZDUGŹEXWWRQDQGWKH
6:&EDFNZDUGŻEXWWRQDQGWKHQSUHVVWKH6:&FRQILUP
ƔEXWWRQ
6HOHFWWKH³)Q´IXQFWLRQE\XVLQJWKH6:&IRUZDUGŹEXWWRQDQG
WKH6:&EDFNZDUGŻEXWWRQDQGWKHQSUHVVWKH6:&
FRQILUPƔEXWWRQ
6HOHFWIURP³RQ´RU³R))´E\XVLQJWKH6:&IRUZDUGŹEXWWRQDQG
WKH6:&EDFNZDUGŻEXWWRQDQGWKHQSUHVVWKH6:&
FRQILUPƔEXWWRQ
The Low Ambient Kit function is set. PCB does not need reset.
Figure 20: Setting the Low Ambient Kit Function.
Settings
Function
oFF (Default)
Low Ambient Kit is Not Installed
on
Low Ambient Kit is Installed
Table 31: Setting the Low Ambient Kit Function.
OTHER CONTROLS
Setting Optional Modes
