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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.
Night Low Sound Function (Fn3)
The Night Low Sound Function reduces the operating speed of the
outdoor unit fans (according to the input signal) during “off-peak”
hours under normal circumstances when in cooling mode. Operating
at a low RPM reduces the fan sound levels of the outdoor unit at
night (or other off-peak hours), which usually has a low cooling load.
On a rolling 24 hour basis, an internal timer begins counting hours
after the start time (delay set after peak cooling recorded operation),
switching to restricted fan speed duration operation, following what-
ever settings have been chosen.
For use on both heat pump and heat recovery systems.
• Oil return is considered an abnormal condition.
• Timed algorithm. Restricted fan speed period length and start delay
is selectable.
• Delay timer starts each day when, during a one (1) minute period
the highest demand for cooling is recorded by the outdoor unit.
Turn No. 5 on the master outdoor unit PCB
DIP switch bank SW01 to ON.
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Select from “op1” through “op12” options (see table) by using the
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Press the SW01D Reset Button one (1) time to reset PCB.
The Night Low Sound function is set; the selected option value is
saved in the EEPROM.
Figure 13: Setting the Night Low Sound Function.
Table 25: Setting the Time and Related Sound Level.
Settings
Start Time
(Delay after Peak Cooling Recorded) (Hour)*
Restricted Fan Speed Duration
(Hour)
Approximate Noise Level dB(A)
6 Ton 8 to 20 Ton
op1 8.0 9.0 55 59
op2 6.5 10.5 55 59
op3 5.0 12.0 55 59
op4 8.0 9.0 52 56
op5 6.5 10.5 52 56
op6 5.0 12.0 52 56
op7 8.0 9.0 49 53
op8 6.5 10.5 49 53
op9 5.0 12.0 49 53
op10 (Default) 0.0 (Continuous Operation) 24.0 55 59
op11 0.0 (Continuous Operation) 24.0 52 56
op12 0.0 (Continuous Operation) 24.0 49 53
*The system measures ambient temperature (minimum and maximum) in “Wait Time” to help determine when the system can start operating in Night Low Sound.
OTHER CONTROLS
Setting Optional Modes
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