45
English
Instal
lation Pr
oc
edur
e
Connecting the MCU (MCU-S6NEK2N, MCU-S4NEK3N, MCU-S2NEK2N, MCU-S1NEK1N)
Example
Outdoor
unit
Indoor unit
Indoor unit
ELB
(A)
(B)
ELB
MCCB
MCCB
220-240 V~
• (A) Power must be supplied to the MCU separately from the outdoor unit.
• (B) Connect the communication cable of the outdoor unit (F1, F2) to the communication cable of the MCU (F1, F2)
Grounding work
Grounding must be done by a qualified installer for your safety.
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 table.
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) About grounding work 3.
• Grounding work must be done by an expert (with qualification).
•
Check if the grounding resistance is lower than 100Ω. When installing an 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) Grounding at dry place
•
The grounding resistance should be lower than 100Ω. Even in worst case, grounding resistance should be lower than 250Ω.
Performing the grounding work
• Use a rated grounding cable by referring to the specification of the electric cable for the outdoor unit.
※
When using the exclusive grounding terminal (When the
grounding terminal is already built on the house)
※
When using grounding of the switch board
Exclusive
grounding terminal
Distributing
board
Summary of Contents for AM AXV Series
Page 68: ......
