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Installation Instructions
Wiring
· Turn OFF the main power switch to the indoor unit and the outdoor unit, and wait for at least 3 minutes before electrical
wiring work or a periodical check is performed.
· Check to ensure that the indoor fan and the outdoor fan have stopped, before electrical wiring work or a periodical check is
performed.
· Protect the wires, electrical parts, etc. from rats or other small animals. If not protected, rats may gnaw at unprotected
parts and in the worst-case scenario, a fire will occur.
· Prevent the wirings from touching the refrigerant pipes, plate edges, and electrical parts inside the unit.
If not done so, the wires will be damaged and in the worst-case scenario, a fire will occur.
· Install an ELB (Electric Leakage Break) at the power source.
If an ELB is not used, it can cause electric shock or fire at the worst-case scenario.
· This unit uses an inverter, which means that it must use an earth leak detector capable of handling harmonics in order to
prevent malfunctioning of the earth leak detector itself.
· Do not use intermediate connection wires, stranded wires(see Attentions when Connecting the Power Supply Wiring),
extension cables or control line connection, as the use of these wires may cause unwanted heat, electric shock, or fire.
· The tightening torque of each screw shall be as follows.
M4: 0.7
to 1.0 lb f·ft. (1.0 to 1.3 N·m)
f·ft. (2.0 to 2.5 N·m)
M5: 1.5 to 1.8 lb
M6: 3.0 to 3.7 lb
f·ft. (4.0 to 5.0 N·m)
f·ft. (9.0 to 11.0 N·m)
M8: 6.6 to 8.1 lb
M10: 13.3 to 217 lb
f·ft. (18.0 to 23.0 N·m)
Keep the above tightening torque values in mind when performing wiring work.
· Wrap tape material along the wire and seal wiring holes, to prevent entrance of condensed water and insects.
· Tightly secure the power source wiring using the cord clamp inside the unit.
Note: Fix the rubber bushes with adhesive when conduit tubes to the outdoor unit are not used.
General Check
(1) Make sure that the field-selected electrical components (main power switches, circuit breakers, wires, conduit
connectors and wire terminals) have been properly selected according to the electrical data.
Make sure that the components comply with National Electrical Code (NEC).
(2) Check to ensure that the voltage of power supply is within +10% of nominal voltage and earth phase is contained in the
power supply wires. If not, electrical parts can be damaged.
(3) Check to ensure that the capacity of power supply is enough.
If not, the compressor will be not able to operate due to abnormal voltage drop at startup.
(4) Check to ensure that the earth wire is connected.
(5) Install a main switch, multi-pole main switch, with a space of 0.14 in. (3.5mm) or more, single -
space of 0.12 in. (3.0mm) or more between each phase.
(6) Check to ensure that the electrical resistance is more than 2 MΩ, by measuring the resistance between ground and the
terminal of the electrical parts. If not, do not operate the system until the electrical leakage is located and repaired.
WARNING
！
！
CAUTION
危
险
9
p hase main switch with a
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