3
SAFETY PRECAUTIONS
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Entrust all installation and electrical work to the dealer where the system was purchased or a professional
installer. Faulty installation performed by the purchaser can result in water leakage, electrical shock, fire or other
mishaps.
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Perform all installation and electrical work in accordance with the instructions in "Attention Installation Work
Coordinators" and "Attention Electrical Work Coordinators." Faulty installation can result in refrigerant or water
leakage, electrical shock, fire or other mishaps.
x
Have all electrical work conducted by persons qualified to perform such electrical work, in accordance with
"Technical Standards for Electrical Equipment," "Internal Wiring Regulations," "Attention Installation Work Co-
ordinators," "Attention Electrical Work Coordinators" and the gas heat pump air-conditioner power supply speci-
fications, always using a dedicated circuit. Inadequate power supply circuit capacity, defective construction or
other problems can result in electrical shock or fire.
x
Always use a dedicated branch circuit for electric wiring, not sharing the use of that circuit with other electric
machinery. Such shared use can trip the circuit breaker and cause secondary damage.
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For wiring, use and correctly connect the stipulated cable, carefully securing the cable to prevent transmission
of external force to the terminal connecting section. Faulty connections or securing can generate heat, fires or
other damage.
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Based on the refrigeration air-conditioner equipment facility standards (S0010) of the High Pressure Gas Safety
Institute of Japan, indoor leakage of refrigerant gas must not be allowed to surpass the critical concentration
level of 0.3kg/m
3
(the limit for safe human activity). When exceeding this level, openings should be created
between neighboring rooms or installation should be made of mechanical ventilation equipment operated in
linkage with gas leakage alarm devices. Refrigerant gas leaks in cramped indoor spaces that exceed the critical
concentration can cause oxygen depletion accidents.
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Always install the water heat exchanger unit at locations capable of supporting its weight (fixing the anchor bolts
in place). Inadequate strength can cause the unit to tip over or result in other injury-threatening accidents.
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Perform the stipulated installation work with full consideration and preparations for the threat of typhoons and
other strong winds, earthquakes and other emergency situations. Faulty installation work can result in the units
tipping over or other injury-threatening accidents in such circumstances.
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In the event of refrigerant gas leaks during the work process, the area should be ventilated immediately. Refrig-
erant gas coming into contact with welding burner fires can result in the generation of toxic gas.
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Upon completion of the refrigerant pipe work, perform air tightness tests using nitrogen gas to confirm the
absence of leaks. Leakage of refrigerant gas into indoor areas, followed by contact with fire from fan heaters,
stoves, ranges or other appliances, can result in the generation of toxic gas.
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Avoid shared use of outdoor unit exhaust drainpipes and water heat exchanger unit drainpipes. Flows of exhaust
gas into the room can result in gas poisoning and other accidents.
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Do not directly connect the water heat exchanger unit drain pipes to drainage generating sulfuric gases or other
harmful gases. Flows of harmful gases into the room can result in gas poisoning and other accidents.
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Never directly touch refrigerant gas when handling it. Such contact can cause frostbite.
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Never install a water heat exchanger unit in locations where there is a threat of the generation, inflow, buildup or
leakage of combustible gas, or in locations where volatile flammable items are handled. Ignition of combustible
materials or ignitable gas can cause fires.
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Install drain pipes in accordance with the stipulations in "Attention Installation Work Coordinators" to ensure
reliable drainage, while applying insulation to avoid dew condensation. Defective piping work can result in water
leakage, water damage to household effects and other problems.
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Perform the refrigerant pipe insulation work in accordance with the stipulations in "Attention Installation Work
Coordinators." Failure to properly insulate can cause water leakage, burns and other accidents and injuries. (For
thick pipes, use insulation materials with heat resistance of 120°C or above.)
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Install ground connections, but do not connect the grounding cable to gas pipes, water pipes,
lightning conductors or telephone ground cables. Defective ground connections can cause
electrical shock.
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Always install a ground leakage breaker.
Failure to attach such a breaker can cause electrical shock and fire.
