AA
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Installing grounding wire
Grounding must be done by a qualied installer for you safety.
Use the grouding wire by referring to the specication of the electric cable of the outdoor unit.
1) Grounding the power cable
The standard of grounding may vary according to the rated voltage and installation place of the air conditioner.
Ground the power cable according to the following.
Power condition
Installation place
Voltage to ground is lower than 150V Voltage to ground is over 150V
High humidity
Must perform the grounding work 3.
Note 1)
(Including the case where earth leakage breaker is installed)
Average humidity Perform grounding work 3.
Note 1)
Must perform the grounding work 3.
Note 1)
(Including the case where earth leakage breaker
is installed)
Low humidity
Perform grounding work 3, if possible, for
your safety.
Note 2)
Note 1) Grounding Work 3
• Grounding work must be done by an expert (with qualication).
• Check if the grounding resistance is lower than 100Ω. When installing a earth leakage breaker (that can cut the electric
circuit within 0.5 second in case of a short circuit), allowable grounding resistance should be 30~500Ω.
Note 2) Perform ground work in a dry place
• The grounding resistance should be lower than 100Ω. Even in worst case, grounding resistance should be lower than
250Ω.
2) Performing the grounding work
Use a rated grounding cable by referring to the specication of the electric cable for the outdoor unit
.
When using the terminal for grounding only When using grounding of the switch board
Earth terminal
Switch board
Wiring work
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