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Multi V Ducted Indoor Units
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Connecting the Power Wiring
DANGER
High voltage electricity is required to operate this system. Adhere to the National Electrical Codes and these instructions
when wiring. Always ground the unit following local, state, and National Electrical Codes. Read the safety summary at the begin-
ning of this manual.
•
Secure all field wiring connections with appropriate wire strain relief. Improperly securing wires will create undue stress on equipment power
lugs. Inadequate connections will generate heat, cause a fire and physical injury or death.
•
Properly tighten all power connections. Loose wiring will overheat at connection points, causing a fire, physical injury or death.
•
Connect the indoor unit input power cable but
do not apply power to the indoor unit until authorized to do so by the system commission-
ing agent. Inappropriate power connection can result in equipment damage and will void the LG limited liability warranty.
•
When connecting the communications bus between the outdoor unit, indoor unit(s), and heat recovery unit(s), it does not matter what physi-
cal path or route the wire takes. The installer can use discretion when choosing the order the components are connected to the communica-
tions bus, but must maintain the daisy chain and polarity configuration.
•
Failure to follow any of these power and communications wiring guidelines or instructions will cause communications errors and unit
malfunction.
Don’ts
•
Never use wire caps and never splice communications cables.
•
Never connect zone controllers or other central controllers or LG building management system gateways to the indoor unit / outdoor unit
communications cable.
Connection Procedure
Indoor unit installation best practices are to connect control wiring (low voltage) and then connect power wiring (high voltage).
Do not
apply power to the indoor unit or any Multi V system component until authorized to do so by the system commissioning agent.
1. Ensure the input power is disconnected and there is no power on the power input cable.
2. Remove the knockout plugs from the control box. Remember the communications cable and the power cable must enter the control box
through different knockouts.
3. Install a field provided plastic or rubber grommet in the knockout holes to prevent wire chaffing.
4. If using conduit, connect the conduit to the control box using field provided fittings and industry best-practice procedures.
5. Ensure the power wiring is routed separately from the communications cable to the unit’s terminal block (see figures on the preceeding
pages).
Do not route the communications cable near the power cable. Provide at least three (3) to four (4) inches of slack cable at
each indoor unit.
WIRING
Connection Procedure
