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Removal and Vacuumizing 

The maintenance or other operations of the refrigeration circuit shall be made as per conventional procedures. 

Moreover,  the  flammability  of  refrigerant  shall  also  be  mainly  considered.  The  following  procedures  shall  be 
followed: 

Refrigerant clearing;

Pipeline purification with inert gas;

Vacuumizing;

Pipeline purification again with inert gas;

Pipeline  cutting  or  welding.  The  refrigerant  shall  be  recovered  to  a  proper  cylinder.  The  system  shall  be

purged with OFN, to ensure safety. The step above may need to be repeated for several times. Compressed air or
oxygen cannot be used for purging.

In the course of purging, OFN shall be charged inside the refrigeration system under vacuum state, to reach 

the operating pressure. Afterwards, the OFN shall be discharged to the atmosphere. Finally, the system shall be 
vacuumized. The step above shall be repeated until all the refrigerants in the system are cleared. The OFN charged 
for  the  last  time  shall  be  discharged  to  the  atmosphere.  Afterwards,  the  system  can  be  welded.  The  operation 
above is necessary in case of pipeline welding.  

It shall be guaranteed that no alight fire source is around the outlet of the vacuum pump and the ventilation is 

favorable. 

Welding 

Favorable ventilation must be guaranteed in the maintenance area. After the maintenance machine is subject

to the vacuumizing above, the system refrigerant can be discharged on the outdoor unit side.

Before the outdoor unit is welded, it must be guaranteed that no refrigerant is inside the outdoor unit and the

system refrigerant has been discharged and cleared.

The  refrigeration  pipelines  cannot  be  cut  with  a  welding  gun  under  any  circumstance.  The  refrigeration

pipelines must be disassembled with a pipe cutter, and  the disassembly must be carried out around a ventilation
opening.

Refrigerant Charging Procedures 

The following requirements are added as the supplementation of conventional procedures: 

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;

Before refrigerant charging, the refrigeration system shall be earthed;

A label must be pasted on the refrigeration system after refrigerant charging;

Excessive charging is not allowed; the refrigerant shall be charged slowly;

In case system leakage is identified, refrigerant charging is not allowed unless the leak point is plugged;

During  refrigerant  charging,  the  charging  amount  shall  be  measured  with  an  electronic  scale  or  a  spring

scale.  The  connecting  hose  between  the  refrigerant  cylinder  and  the  charging  equipment  shall  be  relaxed
appropriately, to avoid impact on the measuring accuracy due to stress.

Requirements on storage site of refrigerant

The  cylinder  of  refrigerant  shall  be  placed  in  a  -10~50°C  environment  with  favorable  ventilation,  and

warning labels shall be pasted;

The  maintenance  tool  in  contact  with  the  refrigerant  shall  be  stored  and  used  separately,  and  the

maintenance tool of different refrigerants cannot be mixed.

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.

Maintenance Instructions

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Summary of Contents for 1U22KAEFRA

Page 1: ...24WADFRA 1U71WADFRA Please read this manual carefully before installation This appliance is filled with R32 Keep this operation manual for future reference 0011518288 1U09MAEFRA 1U12MAEFRA 1U18WAEFRA...

Page 2: ...nts 2 Installation Instructions 3 Relocation Procedures 8 Maintenance Instructions 9 Scrapping and Recovery 13 Indoor Outdoor Unit Installion Drawings 12 Safety Precautions 14 Read Before Installation...

Page 3: ...conditioner be sure to bleed the refrigerant circuit to ensure it is free of air and use only the specified refrigerant R32 Make sure ground connection is correct and reliable Do not earth the unit to...

Page 4: ...and open fire are not allowed around the air conditioner Transporting Management Requirements 1 The maximum transporting volume of finished products shall be determined as per local regulations 2 The...

Page 5: ...Air Conditioner Adding Extra Gas With Longer Pipe Calculator WARNING The area of the room in which R32 refrigerant air conditioner is installed cannot be less than the minimum area specified in the t...

Page 6: ...e checked first after unpacking In case the sign is raised the nitrogen sealed still exists Afterwards the black plastic seal cap at the joint of evaporator liquid pipes of the indoor unit shall be pr...

Page 7: ...Read operator manual Read technical manual Operator manual operating instructions Cotton clothes Anti static gloves BEWARE ELECTROSTATICS Goggles Electrical Safety Requirements Note 1 The surrounding...

Page 8: ...eak detection at the joint welding junction of the indoor unit and at the joint of connecting pipelines of the two way stop valve and three way stop valve of the outdoor unit It must be guaranteed tha...

Page 9: ...mount charged are recorded The refrigerant amount charged cannot be confirmed Test Run Installation Instructions 7 Please consult your reseller and or installer to determine if you have a DRED applian...

Page 10: ...r re flaring the same to the outdoor unit Relocation Procedures 8 contractor supplied line a b c d a Fix the OREO module on the board through the bayonet b Reinforce OREO module with screw c Connect c...

Page 11: ...re 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...

Page 12: ...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 substit...

Page 13: ...ntamination 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 cyli...

Page 14: ...shall be used as the hose and shall always be under favorable state Whether the recovery equipment is under favorable state and is properly maintained and whether all the electrical components are se...

Page 15: ...ndoor unit AIR OUTLET AIR INLET CONNECTING PIPING AND ELECTRICAL WIRING DRAIN HOSE 4 Compressor Inside of Unit 1 When installing the unit to wall roof or rooftop fix a supporter surely with nails or w...

Page 16: ...explosion will be caused fire or explosion fire or explosion fire or explosion fire or explosion fire explosion 14 Safety Precautions R32 R R3 32 2 R32 R32 R32 R32 for conventional HFC refrigerants w...

Page 17: ...R32 15 Safety Precautions WARNING CAUTION N Open the window and well ventilated the room...

Page 18: ...roof breaker for current leakage at the power source to avoid the risk of the electric shock Without a breaker for current leakage will cause risks of electric shock fire or explosion Do not use large...

Page 19: ...R32 R32 R32 R32 R32 R32 R32 R32 R32 Read Before Installation 17...

Page 20: ...3 R32 R32 R32 R32 R32 R32 R32 Read Before Installation 18...

Page 21: ...R32 R32 R32 R32 R32 R32 R32 R32 10A HFC 410A Read Before Installation 19...

Page 22: ...EFRA 1U18WAEFRA 1U50WAEFRA 1U24WAEFRA 1U71WAEFRA B 60mm B 60mm A 212mm C 126mm 51mm 51mm B 60mm B 60mm AS60QEEHRA A 218mm C 151mm 38 5mm 38 5mm AS50QDEHRA Installation Procedure 655 155 130 404 Floor...

Page 23: ...If the pipe has to be lengthened the refrigerant should be charged according to Dg m But the charge of refrigerant must be conducted by professional air conditioner engineer Before adding additional...

Page 24: ...Installation Procedure 22...

Page 25: ...evacuation degree Evacuate Installation Procedure 23...

Page 26: ...cal 4G1 0mm 4G1 0mm 3G1 5mm 3G2 5mm 1U71WADFRA Power cable 3G1 5mm2 4G1 0mm 2 POWER 1U26MADFRA 1U35MADFRA 1U53WADFRA 1U71WADFRA 4G1 0mm 7 1KW 4G1 0mm 3G2 5mm 30 2 5 25 25 20 1 POWER 1U25MAEFRA 1U35MAE...

Page 27: ...stantaneous stop F27 Directly display 8 Compressor discarging temperature protection F4 Directly display F8 Trouble record 9 Abnormal of DC motor F21 Directly display 10 Abnormal of piping sensor F7 D...

Page 28: ...our policy of continuous product improvement these dimensionsandspeci cationsmaychangeatanytime Youshouldthereforecheckwithyourdealeror Haier s Customer Care Centre to ensure this yer correctly descri...

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