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Maintenance Instructions
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SufficThe 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.
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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.
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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.
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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.
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In case leakage is suspected, the open fire at the site shall be evacuated or be put out.
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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.
Maintenance Items
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Before the refrigeration system is operated, the circulating system shall be cleaned with nitrogen. Afterwards,
the outdoor unit shall be vacuumized, the duration of which cannot be less than 30 minutes. Finally, 1.5~2.0MPa
OFN shall be used for nitrogen flushing (30 seconds~1 minute), to confirm the position requiring treatment.
Maintenance of the refrigeration system is only allowed after the residual gas of flammable refrigerant is removed.
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During the use of refrigerant charging tools, cross contamination of different refrigerants shall be avoided.
The total length (including the refrigerant pipelines) shall be shortened as much as possible, to reduce the residual
of refrigerant inside.
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The cylinders of refrigerant shall be kept upright, and be fixed.
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Before refrigerant charging, the refrigeration system shall be earthed.
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The refrigerant charged shall be of the type and volume specified on the nameplate. Excessive charging is
not allowed.
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After maintenance of the refrigeration system, the system shall be sealed with a safe manner.
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The maintenance in progress shall not damage or lower the original class of safety protection of the system.
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Partial of the electrical component under maintenance shall be subject to inspection on refrigerant leakage
with dedicated leak detection equipment.
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After the maintenance, the components with safety protection functions cannot be disassembled or removed.
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During the maintenance of sealing elements, before opening the seal cover, the air conditioner shall be
powered off first. When power supply is required, continuous leak detection shall be carried out at the most
dangerous position, to avoid potential risks.
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During maintenance of electrical components, the replacement of enclosures shall not affect the level of
protection.
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After maintenance, it shall be guaranteed that the sealing functions will not be damaged or the sealing
materials will not lose the function of preventing the entry of flammable gas due to aging. The substitute
components shall meet the recommended requirements of the air conditioner manufacturer.
The intrinsically safe element refers to the components working continuously inside flammable gas without any
risks.
Leak Detection Methods
Maintenance Requirements
Maintenance of Electrical Components
Maintenance of Intrinsically Safe Elements
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