Night Low Sound Function (Fn3) - LG Multi V5 Service Manual
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- Data manual (162 pages) ,
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- Engineering manual (105 pages)
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OTHER CONTROLS
Setting Optional Modes
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.
Table 25: Setting the Time and Related Sound Level.
Settings
(Delay after Peak Cooling Recorded) (Hour)*
op1
op2
op3
op4
op5
op6
op7
op8
op9
op10 (Default)
op11
op12
*The system measures ambient temperature (minimum and maximum) in "Wait Time" to help determine when the system can start operating in Night Low Sound.
66
Start Time
8.0
6.5
5.0
8.0
6.5
5.0
8.0
6.5
5.0
0.0 (Continuous Operation)
0.0 (Continuous Operation)
0.0 (Continuous Operation)
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.
Figure 13: Setting the Night Low Sound Function.
Turn No. 5 on the master outdoor unit PCB
DIP switch bank SW01 to ON.
Select from "op1" through "op12" options (see table) by using the
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.
Restricted Fan Speed Duration
(Hour)
9.0
10.5
12.0
9.0
10.5
12.0
9.0
10.5
12.0
24.0
24.0
24.0
Approximate Noise Level dB(A)
6 Ton
8 to 20 Ton
55
59
55
59
55
59
52
56
52
56
52
56
49
53
49
53
49
53
55
59
52
56
49
53
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Troubleshooting
