Safety Considerations
SiUS28-902_B
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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:
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 or heat pump 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). Insuffi-
cient 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
