Haier AS53DDBHRA [11/28] Maintenance items

Maintenance Items

Maintenance Requirements

 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.

 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.

 The cylinders of refrigerant shall be kept upright, and be fixed.

 Before refrigerant charging, the refrigeration system shall be earthed.

 The refrigerant charged shall be of the type and volume specified on the nameplate. Excessive charging is

not allowed.

 After maintenance of the refrigeration system, the system shall be sealed with a safe manner.

 The maintenance in progress shall not damage or lower the original class of safety protection of the system.

Maintenance of Electrical Components

 Partial of the electrical component under maintenance shall be subject to inspection on refrigerant leakage

with dedicated leak detection equipment.

 After the maintenance, the components with safety protection functions cannot be disassembled or removed.

 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.

 During maintenance of electrical components, the replacement of enclosures shall not affect the level of

protection.

 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.

Maintenance of Intrinsically Safe Elements

The intrinsically safe element refers to the components working continuously inside flammable gas without any

risks.

 Before any maintenance, leak detection and inspection on earthing reliability of the air conditioner must be

carried out, to ensure no leakage and reliable earthing.

 In case the allowable voltage and current limit may be surpassed during the service of the air conditioner,

any inductance or capacitance cannot be added in the circuit.

 Only the elements appointed by the air conditioner manufacturer can be used as the parts and components

replaced, or otherwise a fire may be triggered in case of refrigerant leakage.

 If maintenance work does not involve system pipelines, the system pipelines shall be well protected, to ensure

that the maintenance will not cause any leakage.

 After maintenance and before test run, the air conditioner must be subject to leak detection and inspection on

earthing reliability with leak detection equipment or leak detecting solution. It shall be guaranteed that the startup

inspection is carried out without leakage and under reliable earthing.

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