Haier 1U71S2SG1FA Service Manual page 173

Maintenance Instructions
Maintenance Precautions
Precautions
• For all the faults requiring welding the refrigeration pipelines or components inside the refrigeration system of R32
refrigerant air conditioners, maintenance at the user's site is never allowed.
• For the faults requiring radical disassembly and bending operation of the heat exchanger, such as the
replacement of the outdoor unit chassis and integral disassembly of the condenser, inspection and maintenance at
the user's site are never allowed.
• For the faults requiring replacement of the compressor or parts & components of refrigeration system,
maintenance at the user's site is not allowed.
• For other faults not involved in the refrigerant container, internal refrigeration pipelines and refrigeration elements,
the maintenance at the user's site is allowed, including the cleaning and dredging of the refrigeration system
requiring no disassembly of refrigeration elements and no welding.
• In case replacement of gas/liquid pipes is required during maintenance, the joint of evaporator gas/liquid pipes
of the indoor unit shall be cut off with a cutting knife. Connection is only allowed after re-flaring (the same to the
outdoor unit).
Qualification Requirements of Maintenance Personnel
1. All the operators or the maintenance personnel involved in refrigerating circuits shall be provided with the
effective certificate issued by an industry-accepted assessment institute, to ensure that they are qualified for safety
disposal of refrigerant as required in the assessment regulations.
2. The equipment can only be maintained and repaired as per the method recommended by the manufacturer. In
case the assistance from personnel of other disciplines is required, the assistance shall be supervised by
the personnel with qualification certificate involved in flammable refrigerant.
Inspection on Maintenance Environment
• Before operation, the refrigerant leaked in the room is not allowed.
• The area of the room in which maintenance is made shall be in line with this manual.
• Continuous ventilation shall be maintained during maintenance.
• Qpen fire or high-temperature heat source higher than 548 degree which can easily give birth to open fire is not
allowed inside the room within the maintenance area.
• During maintenance, the phones and the radioactive electronics of all the operators inside the room must be
powered off.
• Qne dry powder or carbon dioxide extinguisher shall be equipped inside the maintenance area, and the
extinguisher must be under available state.
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