LMCN078HV Engineering Manual

Indoor Unit Group Control
ELECTRICAL CONNECTIONS
Between Multiple Indoor Units Operating as a
Group (Group Control)
If any indoor units were specified to operate in unison:
• Before running the field provided or LG provided cable, decide which indoor unit will be
the “Master.” The other indoor units in that group will be designated as “Slave(s).” The
zone controller will be connected to the “Master.”
• Set the pertinent DIP switch at each indoor unit to identify the Master and Slave(s).
On wall mounted indoor unit models, set the assignment using the handheld remote
controller.
• Use a daisy chain configuration and connect all of the group’s indoor units together
starting at the “Master” unit.
• NEVER splice, cut, or extend LG provided cable with field provided cable. Always
include enough cable to cover distance between all components.
For indoor units with hardwired connections SIG - 12V - GND (Comm.)
terminals:
• From the controller to the master indoor unit, use field provided or LG provided 22
AWG, 3-conductor, twisted, stranded, unshielded. All wiring must comply with all ap-
plicable local / national codes.
• From the master indoor unit to the slave indoor unit(s), daisy chain using field provided
or LG provided 22 AWG, 3-conductor, twisted, stranded, unshielded. All wiring must
comply with all applicable local / national codes.
• Do not attach wire to 12VDC terminal to the slave indoor units. All wiring must
comply with all applicable local and national codes.
• NEVER splice, cut, or extend LG provided cable with field provided cable. Always
include enough cable to cover distance between all components.
For indoor units with CN-REMO connections:
Use one (or multiple) Group Control Kit(s) (sold separately) containing extension and
Y-splitter cables. Use one (1) group control cable kit for each indoor unit in the group
except for the last indoor unit. NEVER splice, cut, or extend cable length with field
provided cable.
• Cable connected to zone controller is the factory default connection.
• Indoor unit connections depend on indoor unit type.
Figure 274:Example of Indoor Unit Group to Zone
Controller Connections (Sig-12V-GND [Comm.]
Terminal).
Figure 275:Example of Indoor Unit Group to Zone
Controller Connections (CN-REMO).
Master Indoor Unit
Indoor Unit
Indoor Unit
Signal
12VDC Comm.
Signal
12VDC Comm.
4 5
6
Signal
12VDC Comm.
Signal
12VDC Comm.
CN-REMO
On All Indoor Unit Styles
CN-REMO
On All Indoor Unit Styles
CN-REMO
On All Indoor Unit Styles
LG
Supplied
LG Supplied Group Control Kit (PZCWRCG3)
Accessory
Model
Number
Image
Wired Remote Group Control
Cable Assembly -
For connecting multiple
indoor units to a control group
PZCWRCG3
Wired Remote/Wired Remote
Extension Cable -
For extending the distance
between indoor units or
remote controllers in a control
group
PZCWRC1
Table 123:Accessories for Some Group Control Applications.
General Specifications
• Wired remote controllers can be connected to all indoor unit types.
• Wireless controllers can be used in conjunction with wired remote controllers.
• A dry contact unit can be connected with a central controller simultaneously.
- The master indoor unit is recognized by the dry contact unit and the central
controller.
- Group Control only available for indoor units manufactured after February
2009.
- The central controller can control indoor units after setting the address of the
master indoor unit only.
- Slave indoor unit cannot be individually controlled by central controller.
- Slave indoor unit will operate like master indoor unit.
• If an error occurs with the indoor unit, the error will be displayed on the wired remote controller.
• The following functions are available with group control:
• Selection of operation options (operation/mode/set temperature)
• Control of air flow rate (High/Medium/Low)
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
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Wiring Connections
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