Indoor Unit Communications Cable Connections - LG MULTI V ARNU073M1A4 Installation Manual

WIRING

Indoor Unit Communications Cable Connections

Communication Cable Connection
Note:
When connecting the communications bus between the outdoor unit, indoor unit(s), and heat recovery unit(s),
it does not matter what physical path or route the wire takes. The installer may use discretion when choosing
the order the components are connected to the communications bus, but must maintain the daisy chain and
polarity configuration.
1. Remove a knock-out plug from the control box. Remember the communications cable and the power
cable must enter the control box through different knockouts.
2. Field-install a plastic or rubber grommet in the knockout hole to prevent wire chaffing.
3. If using conduit, connect the conduit to the control box using field-provided fittings and industry best-
practice procedures.
4. Provide at least three (3) to four (4) inches of slack cable at each indoor unit.
5. Secure the communications cable to the inside surface of the control box using a field provided nylon
wire clamp.
6. Strip approximately quarter of an inch of insulation from each communications cable conductor. At
each indoor unit, insert the conductors under the terminal screw.
7. Securely tighten the terminal screws to prevent the communications conductors from coming loose
from the terminal block.
8. Secure the communica-
tions cable in appropriate
locations outside the
indoor unit to prevent
damage to the cable or
injury to maintenance
personnel.
52
Figure 48: Location of Power Wiring and Communications Cable Terminals in the B8 High Static
and L1, L2, and L3 Low Static Ducted Indoor Units
BG, B8 Frame Terminals
L(L1) N(L2)
A B
Power Supply
Communications
High Voltage
(208/230V)
Figure 49: Location of Power Wiring and Communications Cable Terminals in
the M1, M2 and M3 High Static Ducted Indoor Units
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.
Conduit
L(L1) N(L2)
YL RD BK A B
Wired ODU
Power
Remote Comm
Supply
Controller
(208/230V)
Lock nut
Conduit
mounting
plate