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LGRED° Technology
LGRED technology is included in Multi V 5 air-source units produced after February 2019. The feature allows heat pump or heat recovery
systems to operate in heating only mode (i.e., all indoor units in heating mode) down to -22°F outdoor ambient wet bulb by updating the main
PCB software (v1.26) and replacing an air temperature sensor. Multi V 5 air-source units without these changes can only operate down to
-13°F. For more information, contact your local LG sales representative.
PRHR*3 Heat Recovery Units
The PRHR*3A series of heat recovery units were released in June 2018, and are not automatically backwards compatible with all LG man-
ufactured VRF air / water source units. The 3A heat recovery units will be compatible with many LG manufactured air source / water source
units if its "Starting Production Date," the "Production Starting Serial No.," and / or the "Upgrade Software Service" dates fall after the dates
shown below (see table).
LG VRF systems can operate with both old 2A heat recovery units and new 3A heat recovery units if the outdoor unit software has been
upgraded. If a system includes a mix of both old and new heat recovery units, system design must follow 2A heat recovery unit series piping
rules. For more information, contact your local LG sales representative.
Table 18: PRHR*3 Heat Recovery Unit to Air / Water Source Unit Compatibility.
Multi V 5 with LGRED*
Multi V 5
Multi V S
Multi V S with LGRED
*Low ambient performance with LGRED° heat technology is included in Multi V 5 air source units produced after February 2019.
Generation 4 Indoor Units
LG's indoor units are designated Generation 4 (Gen 4). For Gen
4 indoor units to operate with Gen 4 indoor unit features, the air con-
ditioning system must meet the following requirements:
• All indoor units, heat recovery units, and air / water source units
must be Gen 4 or higher. Gen 4 ODU and IDU model numbers end
in "4." HRU model numbers end in "02A" or "03A."
• All air / water source units must have Gen 4 or higher software
factory or field installed.
• Air / water source units DIP switch 3 must be set to ON
(factory default setting is OFF).
• All controllers must support Gen 4 indoor unit features.
The figure at right shows the outdoor unit DIP switch. All air and
water source units, indoor units, heat recovery units, and controllers
in a system must be Gen 4 compatible or the system will not operate
with Gen 4 indoor unit features.
If the ODU is powered On when dipswitch 3 is set to ON position,
power must be cycled to the ODU or PCB reset for the setting to
take effect.
LGRED°, HRU Compatibility, and Gen 4 DIP Switch Settings
Model
Starting Production Date Production Starting Serial No.
ARUM****TE5
February 1, 2019
ARUM****TE5
February 1, 2018
ARUB060GSS4
October 1, 2018
ARUM***GSS5
December 1, 2020
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.
1902xxx
1802xxx
1810xxx
2012xxx
Figure 41: Location and Setting of Outdoor Unit DIP Switch 3.
Air/Water Source Unit DIP Switch No. 3
ON
OFF
1 2
3
4
5
6
7
1 2
3
4
5
6
7
ELECTRICAL
Upgrade Software Service
N/A
September 28, 2018
September 28, 2018
N/A
ON
OFF
1 2
3
4
5
6
1 2
3
4
5
6
7
7
55
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