Hitachi RAC-25YH4, Service Manual, Page: 8 / 121

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SAFETY PRECAUTION
• Please read the “Safety Precaution” carefully before operating the unit to ensure correct usage of the unit.
• Pay special attention to signs of “ Warning ” and “ Caution ”. The “Warning” section contains
matters which, if not observed strictly, may cause death or serious injury. The “Caution” section
contains matters which may result in serious consequences if not observed properly. Please observe
all instructions strictly to ensure safety.
• The signs indicate the following meanings. (The following are examples of signs.)
• Please keep this manual after reading.
This sign in the figure indicates prohibition. Indicates the instructions that must be followed.
WARNING
CAUTION
• Do not reconstruct the unit.
Water leakage, fault, short circuit or fire may occur if you reconstruct the unit by
yourself.
• Please ask your sales agent or qualified technician for the installation of your
unit.
Water leakage, short circuit or fire may occur if you install the unit by yourself.
• Please use earth line.
Do not place the earth line near water or gas pipes, lightning-conductor, or the
earth line of telephone. Improper installation of earth line may cause electric
shock.
• Be sure to use the specified piping set for R410A. Otherwise, this may result in
broken copper pipes or faults.
• A circuit breaker should be installed depending on the mounting site of the unit.
Without a circuit breaker, the danger of electric shock exists.
• Do not install the unit near a location where there is flammable gas.
The outdoor unit may catch fire if flammable gas leaks around it. Piping shall be
suitable supported with a maximum spacing of 1m between the supports.
• Please ensure smooth flow of water when installing the drain hose. If any failure
is found in the drain path, water drops from the indoor and outdoor units, causing
wet household effects.
• Make sure that a single phase 230V power source is used.
The use of other power sources may cause electrical components to overheat
and lead to fire.
PROHIBITION
CONNECT EARTH LINE
PROHIBITION
PROHIBITION
• Should abnormal situation arise (like burning smell), please stop operating the
unit and remove plug from the socket or turn off the circuit breaker. Contact your
agent. Fault, short circuit or fire may occur if you continue to operate the unit
under abnormal situation.
• Please contact your agent for maintenance.
Improper self maintenance may cause electric shock and fire.
• Please contact your agent if you need to remove and reinstall the unit.
Electric shock or fire may occur if you remove and reinstall the unit yourself improperly.
WARNING
PRECAUTIONS DURING INSTALLATION
PRECAUTIONS DURING SHIFTING OR MAINTENANCE
“OFF”
PROHIBITION
• Avoid an extended period of direct air flow for your health.
• Do not connect the power calbe with an extension cable or do not plug too many
leads of the other electric appliance into the socket where this cable is plugged.
In addition, wire the cable with some allowances to prevent the cable from stretching.
Not doing so will cause an electrical shock, heat generation or fire.
PROHIBITION
• Do not put objects like thin rods into the panel of blower and suction side
because the high-speed fan inside may cause danger.
• Do not bundle the power cable, pull it, put something on it, heat it, process it, or
put it between things. Breakage of the power cable may result.
Use of a damaged cable may cause an electrical shock or a fire.
PROHIBITION
PROHIBITION
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