Electrical Wiring; Wire Specification - LG THERMA V Air-to-Water Heat Pump Installation Manual

Piping and Wiring for Outdoor Unit

Electrical Wiring

Two kind of cables should be connected to the outdoor unit : One is ʻPower cableʼ, the other one is ʻConnecting cableʼ.
Power cable is a cable which is used to supply external electricity to the outdoor unit. This cable is generally connected
between external power source (such as main electric power distribution panel of userʼs house) and the outdoor unit.
Connecting cable is, on the other hand, used to connect between the outdoor unit and the indoor unit to supply electric
power to the indoor unit and to establish the communication between the outdoor unit and the indoor unit.
Procedure for wiring to the outdoor unit is four steps. Before starting wiring, check if wire specification is suitable and
read following directions and cautions VERY carefully.

Wire Specification

Power Cable Specification : The power cord connected to the outdoor unit should be complied with
IEC 60245 or HD 22.4 S4(Rubber insulated cord, type 60245 IEC 66 or H07RN-F)
If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly
qualified persons in order to avoid a hazard.
Terminal Specification of Power Cable and related Cautions :
Use round pressure terminals for connections to the power terminal block.
When none are available, follow the instructions below.
• Do not connect wiring of different thicknesses to the power terminal block. (Slack in the power
wiring may cause abnormal heat.)
• When connecting wiring which is the same thickness, do as shown in the figure below.
Connecting Cable Specification : The connecting cable, being used to connect the indoor unit and
outdoor unit, should be complied with IEC 60335-1 standard (Rubber insulation, type H07RN-F
approved by HAR or SAA).
46 Air-to-Water Heat Pump
1 Phase(Ø)
Round pressure terminal
If the supply cable is damaged, it must be replaced by a special cable or
assembly available from the manufacturer or its service agent.
3 Phase(Ø)
Power wire