Service Manual

Safety Considerations SiUS091133
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1. Safety Considerations
Read these SAFETY CONSIDERATIONS carefully before performing any repair work. Comply with these safety symbols without
fail.Meanings of DANGER, WARNING, CAUTION, and NOTE Symbols:
DANGER .............. Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING ............ Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION ............. Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It
may also be used to alert against unsafe practices.
NOTE .................. Indicates situations that may result in equipment or property-damage accidents only.
1.1 Safety Considerations for Repair
• If refrigerant gas leaks during repair or service, ventilate the area immediately. Refrigerant gas may produce toxic gas if
it comes into contact with flames. Refrigerant gas is heavier than air and replaces oxygen. In the event of an accident, a
massive leak could lead to oxygen depletion, especially in basements, and an asphyxiation hazard could occur leading
to serious injury or death.
• Do not start or stop the air conditioner operation by plugging or unplugging the power cable plug if a plug is used.
Plugging or unplugging the power cable plug to operate the equipment may cause an electrical shock or fire.
• Use parts listed in the service parts list and appropriate tools to conduct repair work. The use of inappropriate parts
or tools may cause an electrical shock or fire.
• Disconnect power before disassembling the equipment for repairs. Working on the equipment that is connected to
the power supply may cause an electric shock. If it is necessary to supply power to the equipment to conduct repairs
or to inspect the circuits, do not touch any electrically charged sections of the equipment.
• The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. Discharge
the capacitor completely before conducting repair work. A charged capacitor may cause an electrical shock.
• If refrigerant gas is discharged during repair work, do not touch the discharged refrigerant gas. The refrigerant gas
may cause frostbite.
• Use only pipes, flare nuts, tools, and other materials designed specifically for R410A refrigerant systems. Never use
tools or materials designed for R22 refrigerant systems on an R410A refrigerant system. Doing so can cause a
serious accident or an equipment failure.
• Check to see if the parts and wires are mounted and connected properly, and if the connections at the soldered or
crimped terminals are secure. Improper installation and connections may cause excessive heat generation, fire, or
electrical shock.
• Prior to disconnecting the suction or discharge pipe from the compressor at the welded section, pump-down the
refrigerant gas completely in a well-ventilated place first. If there is refrigerant gas or oil remaining inside the
compressor, the refrigerant gas or oil can discharge when the pipe is being disconnected and it may cause an injury.
• Wear a safety helmet, gloves, and a safety belt when working at an elevated height of more than 6.5 ft (2 m). Insufficient
safety measures may cause a fall resulting in injury.
• Do not mix air or gas other than the specified refrigerant R410A to the refrigerant system. If air enters the refrigerant
systems, it can cause an excessive high pressure resulting in equipment damage and injury.
• When relocating the equipment, check if the new installation site has sufficient strength to withstand the weight of the
equipment. If the installation site does not have sufficient strength and the equipment is not properly secured, the
equipment may fall and cause injury.
• Securely fasten the outside unit terminal cover (panel). If the terminal cover/panel is not fastened properly, dust or
water may enter the outside unit causing fire or electric shock.
• When relocating the system, keep the refrigerant circuit free from substances other than the specified refrigerant (R-
410A) such as air. Any presence of air or other foreign substance in the refrigerant circuit can cause an abnormal
pressure rise or rupture, resulting in injury.
• If refrigerant gas leaks, locate the leaking point and repair it before charging refrigerant. After charging refrigerant,
check for refrigerant leaks. If the leaking point cannot be located and the repair work must be stopped, perform a
pump-down and close the service valve to prevent the refrigerant gas from leaking into the room. The refrigerant gas
itself is harmless, but it may generate toxic gases if it comes into contact with flames.