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After the installation has been completed, check for refrigerant leaks.
- If the refrigerant leaks, oxygen starvation may result. If the leaked refrigerant comes in contact
with a heat source, toxic gas will be generated.
Have a fire extinguisher nearby before brazing work.
- If the refrigerant leaks while brazing work is being performed, fire may result.
Provide no-smoking signs at the brazing workplace.
- If the refrigerant leaks when an ignition source is present, fire may result.
1-5. Precautions for electrical wiring
Include some slack in the power cables.
- Failure to do so may break or overheat the cables, resulting in smoke or fire.
Connections must be made securely and without tension on the terminals.
- Improperly connected cables may break, overheat, or cause smoke or fire.
Tighten all terminal screws to the specified torque.
- Loose screws and contact failure may result in smoke or fire.
Electrical work must be performed by qualified personnel in accordance with local
regulations and the instructions provided in this manual. Only use the specified cables and
dedicated circuits.
- Inadequate power source capacity or improper electrical work will result in electric shock,
malfunction, or fire.
Install an inverter circuit breaker on the power supply of each unit.
- Failure to do so may result in electric shock or fire.
Only use properly rated breakers (an earth leakage breaker, local switch <a switch + fuse
that meets local electrical codes>, or overcurrent breaker).
- Failure to do so may result in electric shock, malfunction, smoke, or fire.
Only use standard power cables of sufficient capacity.
- Failure to do so may result in current leakage, overheating, smoke, or fire.
Proper grounding must be provided by qualified personnel.
- Improper grounding may result in electric shock, fire, explosion, or malfunction due to electrical
noise. Do not connect the ground wire to gas or water pipes, lightning rods, or telephone ground
wires.
When air flow decrease is detected of a circulation fan beside the HBC controller installed
at the height of less than 1.8 m from the ground, the system must be powered off within 10
seconds from the detection. Before powering off the system, connect the contactor to the
power cable of the outdoor unit and open the contactor.
After the wiring work has been completed, measure the insulation resistance, and make
sure that it reads at least 1 MΩ.
- Failure to do so may result in electric leakage, malfunction, or fire.
WT09050X01
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