18
Wiring the Unit
Observe the following precautions when making electrical connections.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
NOTICE
Use Copper Conductors Only!
Unit terminals are not designed to accept other types of conductors. Failure to use copper
conductors could result in equipment damage.
•
Make all electrical connections in accordance with electrical codes and ordinances.
•
Select the power cable in accordance with relevant local and national regulations.
•
Wire size must comply with local and national code.
•
Use grade H07RN-F or H05RN-F power cable.
•
Connect the power cable into the power cable terminal and fasten it with a clamp.
•
Unbalanced power must be maintained within 10% of supply rating among whole indoor units.
•
Significantly unbalanced power may shorten the life of the system. If the unbalanced power is
greater than 10% of supply rating, the unit will stop and an error code will be generated.
•
Connect the power cable to the auxiliary circuit breaker. An all-pole disconnection from the
power supply must be incorporated in the field wiring (1/8 in. [3 mm]).
•
All wiring must be protected from weather and damage.
•
Maintain a distance of 2 in. (50 mm) or more between power and communications cables to
prevent interference.
•
Maintain a voltage drop of less than 10% between the power source and the unit(s).
•
Use an appropriate screwdriver for tightening the terminal screws. A screwdriver with a small
head will strip the head and make proper tightening impossible.
•
Over-tightening the terminal screws may break them.
Tightening torque for M4 screws: 0.86–1.06 lbf·ft (12.0–14.7 kgf·cm).
•
After making a knockout hole, apply rust-preventive paint to the bare metal around the hole.
•
Secure the cable conduit to the outdoor knockout using the proper connector and bushing.
Power Wiring
Connect the power cable from the outdoor unit to the indoor unit at terminals
L1
and
L2
. Refer to
and
Communications Wiring
Use 18 AWG, 25 pF/ft nom., 60.7
impedance, braid or foil shielded, twisted pair for
communications wiring.
Connect the communications cable from the outdoor unit to the indoor unit at terminals
F1
and
F2
.
Refer to
.
