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Safety
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.
• 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 under available state.
Maintenance Site Requirements
• 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 arranged outside the maintenance site, with protective (anti-explosive) device being
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" ,"No Smoking", or"Anti static"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.
• The ventilator and other electrical equipment at the maintenance site shall be relatively fixed, with standardized pipe
routing. Temporary wires and sockets at the maintenance site are not allowed.
Leak Detection Methods
• The environment in which the refrigerant leakage is checked shall be free from potential ignition source. Leak detection
with halogen probes (or any other detector with open fire) shall be avoided.
• For the system containing flammable refrigerant, leak detection may be realized with electronic leak detection
equipment. During leak detection, the environment in which the leak detection equipment is calibrated shall be free
from refrigerant. It shall be guaranteed that the leak detection equipment will not become potential ignition source, and
is applicable to the refrigerant to be detected. Leak detection equipment shall be set at a percentage of the LFL of the
refrigerant and shall be calibrated to the refrigerant employed, and the appropriate percentage of gas (25 % maximum)
is confirmed.
• The fluid used for leak detection shall be applicable to most of the refrigerant. The use of chlorine-containing solvent
shall be avoided, to avoid chemical reaction between chlorine and refrigerant and corrosion to copper pipelines.
• In case leakage is suspected, the open fire at the site shall be evacuated or be put out.
• In case welding is required at the leakage position, all the refrigerants shall be recovered, or be isolated at a position far
from the leak point with a stop valve. Before and during welding, the whole system shall be purified with OFN.
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