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1. Safety Precautions
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Before installation, carefully read the “Safety Precautions” for correct installation.
[Signs and Meanings]
Warning: Incorrect operation may cause severe injury.
: Items that must be followed. Make sure that both units for
models must be earthed.
: Prohibition.
: Attention: Items that must be followed by general users.
Precautions for Installation
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Install the unit according to the instructions in the installation manual. Incomplete or incorrect installation or
failure to follow these instructions may cause water leakage, electric shock, or fire.
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Install with the special tools and piping materials for R410A refrigerant and according to the instructions in the
installation manual. As the pressure of R410A, an HFC refrigerant, is 1.4 times higher than the previous R22
refrigerant, use of incorrect piping materials or incorrect installation may cause an explosion, which leads to
water leakage, electric shock or fire.
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Do not install in a location where flammable gas may be produced or flow in. This may cause fire.
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Make sure to install the units in locations that can provide full support of the unit’s weight. Otherwise, the unit
may fall and cause injury.
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Do not climb on the air-conditioner or put objects on it to prevent collapse or overturning, which may cause
injury.
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Make sure that no refrigerant leaks. Although Hitachi uses non-flammable, non-toxic, and odorless safety
refrigerant (HFC), when HFC leaks and comes in contact with sparks, toxic gas produces. Also, as HFC has a
higher mass than air, it will cause oxygen insufficiency near the floor.
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This model uses the non-flammable refrigerant R410A and non-flammable refrigeration oil Ze-GLES RB74 (JX
Nippon Oil & Energy Corporation). Filling other types of refrigerants, gases, oxygen, propane, alcohol, or
refrigeration oil with the special filling machine for R410A and Ze-GLES RB74 may cause machine failure and
even explosion or fire. Make sure to use qualified refrigerant and refrigeration oil only.
●
The machine maintains a high pressure at all times. Do not heat the machine or any parts in any situation. This
may cause machine failure and even explosion or fire.
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Make sure to remove all flammable objects on-site before a welding operation. Otherwise, this may cause fire.
Also, always wear leather gloves before handling refrigerant to prevent frostbite of the hand or the body.
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Clean up refrigerant with non-flammable, non-toxic cleaning agents only. Use of flammable cleaning agents
may cause explosion or fire.
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Ensure adequate ventilation when working in confined spaces to prevent oxygen insufficiency. When cleaning
agents are exposed to sparks at a high temperature, toxic gases may be produced.
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Make sure to recover the cleaning agent after use. Do not freely dilute CFCs in the atmosphere.
Precautions for Electrical Works
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Always ask a qualified electrician to carry out electrical work with reference to the national regulations and the
instructions in this manual. Make sure to use an individual circuit for the air-conditioner. Failure to follow
instructions in this manual, insufficient circuit capacity or improper construction may cause electric shock or
fire.
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Connect units with wires of the correct types and gauges. Use of incorrect wires may cause electric shock or fire.
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Wires should be securely locked on terminals. Loosened connection of wires will cause overheating of terminals
and fire.
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When securing wires on a terminal, make sure wires are unaffected by external influence. Improper connection
may cause overheating of wires and fire.
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Make sure to earth the indoor and outdoor units according to relevant electrical requirements. Unearthed indoor
and outdoor units may cause electric shock. Do not earth indoor and outdoor units a gas pipe, water pipe,
arrester, or phone line. Incomplete earth may cause electric shock.
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It is necessary to install an earth leakage circuit breaker (ELCB). The absence of an ELCB may cause electric
shock or fire.
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Make sure to disconnect power supply before wiring and electrical inspections to prevent electric shock.
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Keep wires away from places where rats or other animals may bite the wires to prevent fire.
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When installing the panel cover, avoid jamming wires together to prevent electric shock and fire.
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Pay special attention to “
Warning” signs. Failure to follow these warning signs during installation (incorrect installation)
may cause severe injury. They are thus extremely important and must be strictly followed.
● While checking any abnormality during the test run after installation, explain to customer the correct methods of usage
and maintenance according to the instructions of user’s manual. Then hand over the installation manual and user’s
manual to customers.
Summary of Contents for RAC-112SQB
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