User manual

9English
Installation Procedure
Step 3 Connecting the power cables,
communication cable, and controllers
You must connect the following three electrical cables to
the outdoor unit:
• The main power cable between the auxiliary circuit
breaker and the outdoor unit.
• The outdoor-to-indoor power cable between the
outdoor unit and the indoor unit.
• The communication cable between the outdoor unit
and the indoor unit.
CAUTION
• During installation, make first the refrigerant
connections and then the electrical connections. If
the unit is uninstalled, first disconnect the electrical
cables and then the refrigerant connections.
• Connect the air conditioner to the earthing system
before making the electrical connections.
NOTE
• Especially, if your outdoor unit is the one designed
for Russian and European markets, consult the supply
authority, if necessary, to estimate and reduce the
supply system impedance before installation.
Air conditioning system examples
When using earth leakage circuit breaker (ELCB) for a
single phase
MCCB
1
ELB
Main power
cable
Communication cable
Outdoor-to-indoor power cable
Earthing
Outdoor Unit
OR
Indoor Unit
ELCB
1
When using earth leakage circuit breaker (ELCB) for a
3-phase, 4-wire system (3P4W)
ELB
Main power
cable
Communication cable
Outdoor-to-indoor power cable
Earthing
Outdoor Unit
OR
Indoor Unit
MCCB
3
ELCB
3
CAUTION
• If the outdoor unit is installed in a location vulnerable
to an electric leak or submergence, make sure to
install an ELCB.