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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.
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Function (Fn6)
Snow Removal Assist
Snow Removal Assist function allows the outdoor unit(s) fans to
operate at regular intervals, for two (2) minutes, at specified speeds
(as seen in the tables below) to remove snow accumulation from the
fan discharge.
The function will only operate when the system has not called for
compressor activity (no demand for heating or cooling) for thirty (30)
minutes, and when the outdoor air temperature is <37ºF. Operates
every thirty (30) minutes for two (2) minutes. Function will stop if
there is an operation error code, or if a compressor starts. Use this
function in areas where snow accumulating on the fan blades and
fan guard is common.
Rapid Defrost
Rapid Defrost function limits the amount of frost and ice are allowed
to build on the coil between defrost cycles (defrost cycles occur
more often). System pressure is monitored, and when system pres-
sure is reduced, the defrost cycle is initiated.
Snow Removal Assist / Rapid Defrost can also be used with Fn4
- Overall Defrost, and Fn22 - Overall Defrost Operating in Low
Temperatures (Heating).
Snow Removal Assist and Rapid Defrost can be used on both heat
pump and heat recovery systems.
• A trained LG service provider must set this function during system
installation.
• If the snow removal / rapid defrost mode is not used, set to OFF.
Turn No. 5 on the master outdoor unit PCB
DIP switch bank SW01 to ON.
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Select from “oFF,” “op1” through “op3” options (see table) by using the
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The Snow Removal / Rapid Defrost function is set.
PCB does not need reset.
Figure 16: Setting the Snow Removal / Rapid Defrost Function.
Settings
Details
Fan Speed During Snow Removal Assist (RPM)
6 Ton
8 to 20 Ton
oFF (Default)
Mode Is Not Set
-
-
op1
Snow Removal Assist Mode
670
850
op2
Rapid Defrost Mode
-
-
op3
Snow Removal Assist Mode and Rapid Defrost Mode
670
850
Table 27: Setting the Snow Removal / Rapid Defrost Function.
OTHER CONTROLS
Setting Optional Modes
