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Maintenance Instructions
Maintenance 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).
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.
•
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 the nameplate.
•
Continuous ventilation shall be maintained during maintenance.
•
Open 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.
•
One dry powder or carbon dioxide extinguisher shall be equipped inside the maintenance area, and the
extinguisher must be working.
•
The maintenance site shall be provided with favorable ventilation and must be flat. Arrangement of the
maintenance site inside the basement is not allowed.
•
Welding zone and non-welding zone shall be divided at the maintenance site, and shall be clearly marked. A
certain safety distance must be guaranteed between the two zones.
•
Ventilators shall be installed at the maintenance site, and exhaust fans, fans, ceiling fans, floor fans and
dedicated exhaust duct can be arranged, to meet the requirements of ventilation volume and uniform exhaust, and
to avoid accumulation of refrigerant gas.
•
Leak detection equipment for flammable refrigerant shall be equipped, with relevant management system
being established. Whether the leak detection equipment is under available state shall be confirmed before
maintenance.
•
Sufficient dedicated vacuum pumps of flammable refrigerant and refrigerant charging equipment shall be
equipped, with relevant management system for maintenance equipment being established. It shall be guaranteed
that the maintenance equipment can only be used for vacuumizing and charging of one type of flammable
refrigerant, and mixed usage is not allowed.
• The master power switch shall be installed outside the maintenance site, with protective (anti-explosive) device
equipped.
•
Nitrogen cylinders, acetylene cylinders and oxygen cylinders shall be placed separately. The distance
between the gas cylinders above and the working area involved in open fire shall be at least 6m. The anti-backfire
valve shall be installed for the acetylene cylinders. The color of the acetylene cylinders and oxygen cylinders
installed shall meet the international requirements.
•
The warning sign of "No Fire" shall be arranged inside the maintenance area.
•
Fire control device suitable for electric appliance such as the dry powder extinguisher or carbon dioxide
extinguisher shall be equipped, and shall always be under the available state.
Precautions
Qualification Requirements of Maintenance Personnel
Inspection on Maintenance Environment
Maintenance Site Requirements
9
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