Indoor Unit Communications Cable Connections - LG Multi V ARNU073M2A4 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. Depending on model, access the control box by removing its cover. 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 communications cable in appropriate locations outside the indoor unit to prevent damage to the cable or injury to maintenance
personnel.
Figure 61: 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 62: Location of Power Wiring and Communications Cable Terminals in the Convertible Mid Static (MA) Ducted Indoor Units.
GN/YL
60
Power Wiring
Wired Controller Cable /
Communication Cable Between
IDUs / HRUs / ODU(s)
Due to our policy of continuous product innovation, some specifications may change without notification.
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Lock nut
Conduit
Conduit
mounting
plate
Conduit Panel
Lock Nut
Conduit
Figure 60: Removing the Control
Box Cover / Accessing the Control
Box (MA Chassis. Appearances
May Vary).