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Piping and Wiring for Outdoor Unit
Electrical Wiring
Two kind of cables should be connected to the outdoor unit : One is 'Power cable', the other one is 'Connecting
cable'. Power cable is a cable which is used to supply external electricity to the outdoor unit. This cable is gen-
erally connected between external power source (such as main electric power distribution panel of user's
house) and the outdoor unit. Connecting cable is, on the other hand, used to connect between the outdoor unit
and the indoor unit 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 suit-
able 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 quali-
fied 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.
Point for attention regarding quality of the public electirc power supply
• In accordance with EN/IEC 61000-3-11, respectively EN/IEC 61000-3-12, it may be necessary to
consult the distribution network operator to ensure that the equipment is connected only to a supply
with Zsys≤Zmax, respectively Ssc ≥ minimum Ssc value.
• European/International Technical Standard setting the limits for voltage changes, voltage fluctua-
tions and flicker in public low-voltage supply systems for equipment with rated current ≤ 75A.
• European/International Technical Standard setting the limits for harmonic currents produced by
equipment connected to public low-voltage systems with input current ≤16A of ≻75A per phase.
50 Air-to-Water Heat Pump
1 Phase(Ø)
Round pressure terminal
3 Phase(Ø)
Power wire
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