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Installing the Earth Wire
• Earthing must be done by your installation specialist
for your safety.
• Use the earth wire by referring to the specification of
the electric cable for the outdoor unit.
Earthing the power cable
• The standard of earthing may vary according to the
rated voltage and installation place of the
Air to water heat pump.
• Earth the power cable according to the following.
Installation
High
place
Power
humidity
condition
Electrical
potential of
lower than 150V
Electrical
Must perform the earthing work 3.
potential of
(In case of installing circuit breaker)
higher than 150V
• Note 1) Earthing work 3
– Earthing must be done by your installation
specialist.
– Check if the earthing resistance is lower than
100Ω. When installing a circuit breaker that can
cut the electric circuit in case of a short circuit, the
allowable earthing resistance can be 30~500Ω.
• Note 2) Earthing at dry place
– The earthing resistance should be lower than 100Ω.
(Even in worst case it should be lower than 250Ω.)
Average
Low humidity
humidity
Perform the
Perform the
earthing work
earthing
2 if possible
work 3.
for your safety.
Note 1)
Note 2)
Note 1)
When using the terminal for earthing only
When using earthing of the switchboard
Earth terminal
Distribution Board
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