Samsung AM***FXVAF Series Скачать руководство пользователя страница 55 | Manualshive

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Samsung AM***FXVAF Series Скачать руководство пользователя страница 55

55

ENGLISH

Installing the indoor units

Model

MCU-S6NEK2N

MCU-S4NEK3N

MCU-S2NEK2N

MCU-S1NEK1N

Example installing

(Each port

connection)

Example installing

(MCU series

connection)

MCU

MCU

MCU series connection

Installing indoor units

Under 16 kW (54MBH) kW indoor unit : Don’t use Y-connector
16 kW (54MBH) ~ 28 kW (96MBH) indoor unit : Use Y-connector at the Gas & Liquid
line

If you want to continuous cooling operation under -5

°

C (23

°

F), set outdoor

‘Expand operational temperature range for cooling operation (HR only)’, and use
Y-connector on 5 kW (17MBH) ~ 16 kW (54MBH) indoor unit

In case of using Y-connector, it is only connectable for port combination at below
Connectable port combination for Y-connector : A + B port, C + D port, E + F port
Non-connectable port combination for Y-connector :
B + C port, D + E port, non-continuous port

Set Dip Switch option for using Y-connector

1

ON

2 3 4

1

ON

2 3 4

1

ON

2 3 4

1

ON

2 3 4

S/W Option

S/W Option

S/W Option

S/W Option

Default

Combination of A+B port Combination of C+D port Combination of E+F port

In case of MCU connection in series, the maximum capacity of indoor units in MCU
series connection is 61.6 kW (210MBH)

This unit is only
connectable for
one port under
16 kW (54MBH)

This unit is impossible
to connect MCU to
MCU in series.

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Содержание AM***FXVAF Series

Страница 1: ...AF Series AM HXVAJ Series AM KXVTF Series AM KXVTJ Series AM KXVGJ Series Air Conditioner installation manual imagine the possibilities Thank you for purchasing this Samsung product k tGzG 㨰䛙G㐘㞬ὤGpt lu ki _TWZ_XYhTW_U GGGX YWX_TW TXXGGG㝘䟸G a _aYY ...

Страница 2: ...installation 24 Electrical wiring work 59 Air tightness test and vacuum drying 75 Pipe insulation 77 Charging additional refrigerant 81 Basic segment display 83 Setting outdoor unit option switch and key function 83 Setting the MCU and Pipe Addresses for HR Only 93 Things to check after completing the installation 97 Inspection and trial operation 99 Automatic refrigerant amount detection function...

Страница 3: ...ur Generally system air conditioners should not be relocated after installation But when it has to be relocated for inevitable reasons please contact Samsung s qualified dealers for system air conditioners WARNING Hazards or unsafe practices that mayresult in severe personal injury or death CAUTION Hazards or unsafe practices that mayresult in minor personal injury to installer user or property da...

Страница 4: ...ires in the electrical parts to make sure that electrical cover is closed securely without any gaps f If the cover is not properly closed heat may generate on the electrical terminal and cause electric shock or fire Exclusive circuit breaker MCCB ELB must be installed to the power supply f When overcurrent or current leakage occurs with no circuit breaker installed power will not be cut off and it...

Страница 5: ...t stabilizer f If you use the wireless remote control it may not operate normally due to ballast stabilizer Do not install the product in following places f Place where outdoor unit s noise and warm air may disturb neighbors It may cause property loss f Do not leave any obstacles around the inlet and outlet of the product It may cause damage or accidents f The place where there is mineral oil or a...

Страница 6: ...the outdoor unit combinations are different from the conventional models f If the pipe length is over 2m 6 56ft between outdoor units make traps to prevent oil stagnation Oil stagnation may occur when outdoor unit at the end of module stops while other outdoor units are still in operation Preparing for installation Outdoor unit classification Classification Small type Large A type Large B type App...

Страница 7: ...termine the size and number of outdoor units needed to achieve the capacity requirements CAUTION Module combination for AM F Series AM H Series ModelnameforCombination 6TON 8TON 10TON 12TON AM072FXVA AM096FXVA AM120FXVA AM144FXVA Numberofindividualoutdoorunits 1 1 1 1 Combinedoutdoorunit AM072 1 AM096 1 AM120 1 AM144 1 AM168 AM192 NominalCapacity Cooling btu h 72000 96000 120000 144000 Heating btu...

Страница 8: ...pacity Cooling btu h 360000 384000 408000 432000 Heating btu h 405000 432000 459000 486000 RatedCapacity Cooling btu h 344000 366000 390000 415000 Heating btu h 386000 410000 435000 460000 Totalcapacityofthe connectedindoor units cooling Minimum btu h 180000 192000 204000 216000 Maximum btu h 468000 499200 530400 561600 Maximumnumberofconnectableindoorunits 62 64 64 64 ModelnameforCombination 38TO...

Страница 9: ... 36000 48000 72000 84000 Maximum btu h 93600 124800 187200 218400 Maximumnumberofconnectableindoorunits 12 16 25 29 ModelnameforCombination 16TON 18TON 20TON 22TON 24TON AM192KXVT AM216KXVT AM240KXVT AM264KXVT AM288KXVT Numberofindividualoutdoorunits 2 3 3 3 3 Combinedoutdoor unit AM072 3 2 1 AM096 2 1 2 3 NominalCapacity Cooling btu h 192000 216000 240000 264000 288000 Heating btu h 216000 243000...

Страница 10: ...To protect damage or scratches insert a piece of cloth between the outdoor unit and the wire rope Wire rope Holes for wire rope to go through When moving with a forklift f Carefully insert the forklift forks into the forklift holes at the bottom of the outdoor unit f Be careful with the forklift from damaging the product Forklift Forklift holes Holes for forklift forks to go through When moving th...

Страница 11: ...f Do not install the product in a place where it will be directly exposed to sea breeze Consult an installation expert or company since you will need to take extra anti corrosion measures if you need to install the product in a place where it can be exposed to direct sea breeze You have to remove dusts and salinity on the heat exchanger and apply designated rust inhibitor more than once a year Sea...

Страница 12: ...ng dangerous level of refrigerant concentration in case of refrigerant leakage extra ventilation system is required When you install the outdoor unit in a high places such as roof install fence or guardrail around it When there is no fence or guardrail service person could fall Do not install the product in places where corrosive gases such as sulfur oxides ammonia and sulfurous gas are produced e...

Страница 13: ...ller or other worker may get injured during work and may also cause problem to the product f If you install multiple number of outdoor units in one space make sure to secure enough ventilation space if there s any walls around the product that may disturb the air flow If enough ventilation space is not secured product may malfunction f You may install the outdoor units with 20mm 0 78 inch of space...

Страница 14: ... unlimited Front side Frontside For Case 1 or Case 3 Height of the wall on the front side should not be higher than 1500mm 60 inch Height of the wall on the air inlet side should not be higher than 500mm 20 inch Height of the wall on the side is not limited If the height of the wall exceeds by certain value h1 h2 additional clearance h1 2 h2 2 Half of the exceeded distance should be added to the s...

Страница 15: ...Pipe 3 4 1 1 8 12TON Pipe in Production 1 1 8 5 8 1 1 8 O 1 1 8 1 2 X Installaton Pipe 1 2 7 8 14TON Pipe in Production 1 1 8 5 8 1 1 8 O 1 1 8 5 8 X Installation Pipe 7 8 16TON Pipe in Production 1 1 8 5 8 1 1 8 X 1 1 8 5 8 X Installation Pipe MODEL AM K Series HR HP GAS LIQUID HIGH GAS SOCKET GAS LIQUID SOCKET 6TON Pipe in Production 1 1 8 1 2 O Installaton Pipe 3 4 3 8 8TON Pipe in Production 1...

Страница 16: ...er 76 240 and below Over 22 4 70 3 and below MXJ YA3100M Over 240 461 and below Over 70 3 135 2 and below MXJ YA3800M Over 461 Over 135 2 Distribution header MXJ HA2512M 154 and below for 4 rooms 45 0 and below for 4 rooms MXJ HA3115M Over 240 461 and below for 8 rooms Over 70 3 135 2 and below for 8 rooms MXJ HA3819M Over 240 for 8 rooms Over 70 3 for 8 rooms Y Joint Outdoor unit MXJ TA3819M 461 ...

Страница 17: ...utdoor unit on the base ground fix it by side or use extra structure 5 In heating operation defrost water may form so you must really care about the drainage and waterproofing the floor To prevent defrost water from stagnating or freezing construct a drainage with over 1 50 slope Ice may form on the floor in winter time 6 It is necessary to add wire mesh or steel bar during concrete construction f...

Страница 18: ...96 803 31 61 54 2 13 Outdoor unit Anti vibration frame 4 Ø 12 Anti vibration Base ground 4 Ø 18 Unit mm inch Classification Small type Large A type Large B type Models AM072F AM096 120 144F AM168 192H AM072 096K AM216KXVGJ A 880 34 65 1 295 50 98 1 295 50 98 B 740 29 13 1 150 45 28 1 150 45 28 Refer to the blueprints in technical data book to make a holes for connecting the anti vibration pad k tG...

Страница 19: ... status of the roof Unit mm inch 960 37 80 760 29 92 100 3 94 80 3 15 80 3 15 80 3 15 6 0 100 3 94 X X Direction of the drainage Slope 1 50 Drainage work for single installation B A 50 1 97 100 3 94 150 5 91 100 3 94 X X SECTION 80 3 15 80 3 15 80 3 15 80 3 15 80 3 15 80 3 15 80 3 15 80 3 15 6 0 6 0 200 7 87 B B 200 7 87 Direction of the drainage Slope 1 50 Drainage work for module installation Un...

Страница 20: ...f Construct draining pit around the base construction and pay attention to the drainage around the outdoor unit Condensation or defrost water may form during outdoor unit operation f If there s any possibility of small animals from entering the pipe outlet block the outlet as shown in the illustration Liquid side pipe Gas side pipe Block the part When withdrawing the pipe from the front side Cauti...

Страница 21: ...duct and there could be a risk of personal injury f Wear protection equipment at all times when making galvanized sheet metal duct since the worker may get injured by the sharp parts f When installing the outdoor unit under the tree or near forest leafs may get into the product and cause problems on the product Therefore install a discharge duct to prevent foreign substance infiltration Protecting...

Страница 22: ...prevention duct as a sufficient countermeasure to prevent snow from accumulating on the outdoor unit When the snow prevention duct is not installed frost may accumulate on the heat exchanger and heating operation may not work normally f Air outlet of the duct should not be directed to the enclosed space Cautions regarding on installing the frame and selecting the base ground Height h of the frame ...

Страница 23: ...r unit outdoor unit may fall and cause personal injury When installing on a rooftop subject to strong wind countermeasures must be taken to prevent the unit from falling down Use a frame that is resistant to corrosion 782 30 79 560 22 05 880 34 05 560 22 05 871 34 29 765 30 12 2300 90 55 668 26 30 532 20 94 2271 89 41 1134 44 65 965 37 99 180 7 09 1632 64 25 1150 45 28 980 38 58 180 7 09 2000 78 7...

Страница 24: ...R 410A only Tool Installation process purpose Compatibility with conventional tool Pipe cutter Refrigerant pipe installation Pipe cutting Compatible Flaring tool Pipe flaring Refrigerant machine oil Apply refrigerant oil on flared part Exclusive ether oil ester oil alkali benzene oil or synthetic oil Torque wrench Connect flare nut with pipe Compatible Pipe bender Pipe bending Nitrogen gas Air tig...

Страница 25: ... 90m 295 28ft you must increase the size of the pipe main pipe by one grade which connects between the outdoor unit to the first branch joint f For H R model When the pipe length including elbow between an outdoor unit and the farthest indoor unit exceeds 90m you must increase the size of the liquid pipe by one grade among the pipes main pipe which connects between the outdoor unit to the first br...

Страница 26: ...3 4 31 75 1 1 4 note2 20 240 70 3 15 88 5 8 28 58 1 1 8 19 05 3 4 31 75 1 1 4 note2 22 264 77 4 19 05 3 4 34 92 1 3 8 22 22 7 8 38 1 1 1 2 note3 24 288 84 4 19 05 3 4 34 92 1 3 8 22 22 7 8 38 1 1 1 2 note3 26 312 91 4 19 05 3 4 34 92 1 3 8 22 22 7 8 38 1 1 1 2 note3 28 336 98 4 19 05 3 4 34 92 1 3 8 22 22 7 8 38 1 1 1 2 note3 30 360 105 5 19 05 3 4 41 28 1 5 8 22 22 7 8 41 28 1 5 8 32 384 112 5 19...

Страница 27: ...te3 240 336 70 3 98 4 19 05 3 4 34 92 1 3 8 22 22 7 8 38 1 1 1 2 note4 336 461 98 4 135 2 19 05 3 4 41 28 1 5 8 22 22 7 8 41 28 1 5 8 461 577 135 2 169 19 05 3 4 41 28 1 5 8 22 22 7 8 53 98 2 1 8 577 169 0 22 22 7 8 53 98 2 1 8 25 40 1 note2 53 98 2 1 8 Note1 Note on measuring distance between branch joints B You must measure the distance between first branch joint to the last indoor unit NOT from...

Страница 28: ...selection according to outdoor unit capacity Classification Model name Outdoor unit capacity MBH kW Y joint D MXJ YA2512M Over 51 136 and below Over 15 0 40 0 and below MXJ YA2812M Over 136 154 and below Over 40 0 45 0 and below MXJ YA2815M Over 154 240 and below Over 45 0 70 3 and below MXJ YA3419M Over 240 336 and below Over 70 3 98 4 and below MXJ YA4119M Over 336 461 and below Over 98 4 135 2 ...

Страница 29: ...below MXJ YA2815M Over 154 240 and below Over 45 0 70 3 and below MXJ YA3419M Over 240 336 and below Over 70 3 98 4 and below MXJ YA4119M Over 336 461 and below Over 98 4 135 2 and below MXJ YA4422M Over 461 Over 135 2 2 Distribution header Classification Model name Specification MBH kW Distribution header E MXJ HA2512M 154 and below for 4 rooms 45 0 and below for 4 rooms MXJ HA3115M 240 and below...

Страница 30: ...5 8 28 58 1 1 8 28 58 1 1 8 19 05 3 4 28 58 1 1 8 28 58 1 1 8 20 240 70 3 15 88 5 8 28 58 1 1 8 28 58 1 1 8 19 05 3 4 28 58 1 1 8 28 58 1 1 8 22 264 77 4 19 05 3 4 34 92 1 3 8 28 58 1 1 8 22 22 7 8 34 92 1 3 8 28 58 1 1 8 24 288 84 4 19 05 3 4 34 92 1 3 8 28 58 1 1 8 22 22 7 8 34 92 1 3 8 28 58 1 1 8 26 312 91 4 19 05 3 4 34 92 1 3 8 28 58 1 1 8 22 22 7 8 34 92 1 3 8 28 58 1 1 8 28 336 98 4 19 05 ...

Страница 31: ...8 28 58 11 8 19 05 3 4 28 58 11 8 28 58 11 8 240 336 70 3 98 4 19 05 3 4 34 92 13 8 28 58 11 8 22 22 7 8 34 92 13 8 28 58 11 8 336 360 98 4 105 5 19 05 3 4 41 28 15 8 28 58 11 8 22 22 7 8 41 28 15 8 28 58 11 8 360 461 105 5 135 2 19 05 3 4 41 28 15 8 34 92 13 8 22 22 7 8 41 28 15 8 34 92 13 8 461 577 135 2 169 0 19 05 3 4 41 28 15 8 34 92 13 8 22 22 7 8 41 28 15 8 34 92 13 8 577 169 0 22 22 7 8 53...

Страница 32: ...el name Outdoor unit capacity MBH kW Liquid Low pressureY joint D MXJ YA2512M Over 51 136 and below Over 15 0 40 0 and below MXJ YA2812M Over 136 154 and below Over 40 0 45 0 and below MXJ YA2815M Over 154 240 and below Over 45 0 70 3 and below MXJ YA3419M Over 240 336 and below Over 70 3 98 4 and below MXJ YA4119M Over 336 461 and below Over 98 4 135 2 and below MXJ YA4422M Over 461 Over 135 2 Hi...

Страница 33: ... and below Over 40 0 45 0 and below MXJ YA2815M Over 154 240 and below Over 45 0 70 3 and below MXJ YA3419M Over 240 336 and below Over 70 3 98 4 and below MXJ YA4119M Over 336 461 and below Over 98 4 135 2 and below MXJ YA4422M Over 461 Over 135 2 Y joint E Only H R MXJ YA1500M 76 and below 22 4 and below MXJ YA2500M Over 76 240 and below Over 22 4 70 3 and below MXJ YA3100M Over 240 461 and belo...

Страница 34: ...s to be calculated based on the sum of all liquid pipe length Classification AM072F AM096F AM120F AM144F AM168H AM192H Basic type kg lb 5 5 12 1 7 4 16 3 7 4 16 3 8 7 19 2 11 0 24 3 11 0 24 3 Classification AM072K AM096K AM216KXVGJ Basic type kg lb 8 4 18 5 8 4 18 5 12 5 27 6 f Amount of additional refrigerant depending on the pipe size ⓐ Amount of additional refrigerant has to be calculated based...

Страница 35: ...1 50 0 68 1 50 1 18 2 60 1 18 2 60 Ceiling AM FNCDC AM JNCDC 0 39 0 86 0 39 0 86 0 56 1 23 0 95 2 09 V AHU AM JNZDC 0 33 0 73 0 50 1 10 0 50 1 10 0 83 1 83 0 88 1 94 1 18 2 60 1 27 2 80 1 69 3 73 1 69 3 73 OAP Duct AM JNESC 1 18 2 60 1 18 2 60 Capacity kBtu Model 5 6 7 5 9 5 12 18 20 23 2 24 32 1waycassette AM FN1DC 0 25 0 55 0 25 0 55 0 25 0 55 4waycassetteS 600x600 AM FNNDC AM KNNDC 0 29 0 64 0 ...

Страница 36: ...e ⓐ Ø6 35 Ø1 4 35 114 8 0 02 0 013 0 7 1 49 5 575 12 19 Ø9 52 Ø3 8 50 164 0 0 06 0 040 3 0 6 56 Ø12 70 Ø1 2 15 49 2 0 125 0 084 1 875 4 13 Classification Model name of indoor unit Number of units Unit amount of refrigerant kg EA lb EA Amount of additional refrigerant kg lb Total amount of additional refrigerant kg lb Indoor unit ⓑ 4way cassette AM018FN4DCH 4 0 45 0 99 1 8 3 96 ⓑ 3 30 7 26 Slim duc...

Страница 37: ...pe Outer diameter Minimum thickness Temper grade mm inch mm inch 6 35 1 4 0 70 0 028 Annealed 9 52 3 8 0 70 0 028 12 70 1 2 0 80 0 031 15 88 5 8 1 00 0 039 19 05 3 4 0 90 0 035 Drawn 22 22 7 8 0 90 0 035 25 40 1 1 00 0 039 28 58 1 1 8 1 10 0 043 31 75 1 1 4 1 10 0 043 34 92 1 3 8 1 21 0 048 38 10 1 1 2 1 35 0 053 41 28 1 5 8 1 43 0 056 44 45 1 3 4 1 60 0 063 50 80 2 2 00 0 079 53 98 2 1 8 2 10 0 0...

Страница 38: ... the refrigerant pipes flush them with nitrogen gas as shown in the picture f If you do not perform nitrogen flushing when welding the pipes oxide may form inside the pipe It can cause the damage of the important parts such as compressor and valves etc f Adjust the flow rate of the nitrogen flushing with a pressure regulator to maintain 0 05m2 h 0 54ft2 h or less Welding part Nitrogen gas Ø 6 35 1...

Страница 39: ...Using flaring tool for R 410A Using conventional flaring tool Clutch type Wing nut type ø6 35 ø1 4 0 0 5 0 0 02 1 0 1 5 0 04 0 06 1 5 2 0 0 06 0 08 ø9 52 ø3 8 0 0 5 0 0 02 1 0 1 5 0 04 0 06 1 5 2 0 0 06 0 08 ø12 70 ø1 2 0 0 5 0 0 02 1 0 1 5 0 04 0 06 1 5 2 0 0 06 0 08 ø15 88 ø5 8 0 0 5 0 0 02 1 0 1 5 0 04 0 06 1 5 2 0 0 06 0 08 5 Check that you flared the pipe correctly f Refer to below illustrati...

Страница 40: ...ft mm inch 6 35 1 4 14 18 10 3 13 3 8 7 9 1 0 34 0 36 D L 90 2 4 5 2 R 0 4 0 8 0 016 0 032 9 52 3 8 34 42 25 1 31 0 12 8 13 2 0 50 0 52 12 7 1 2 49 61 36 1 45 0 16 2 16 6 0 64 0 65 15 88 5 8 68 82 50 2 60 5 19 3 19 7 0 76 0 78 Blowing Nitrogen gas should be done when welding the pipe Make sure to use the provided flare nut Make sure that there are no cracks or twisted part when you need to bend th...

Страница 41: ...e connection Left side connection Caution for using knock out hole Knock out hole Make sure to prevent any damages on the exterior of the outdoor unit Remove all burrs around the knock out hole and apply varnish on the cross section and edges of the knock out hole to prevent rust Use a cable protection tube and bushing to prevent a cable from being damaged when passing through a knock out hole CAU...

Страница 42: ... Fix the bottom side of the piping cover first and then fix the top part of it Separate the knock out hole at the bottom side of the unit and install the pipe After installing and insulating the pipe close up the remaining holes If not small animals such as rats and squirrels may get inside the unit H P Liquid side pipe Gas side pipe Gas side pipe Liquid side pipe H R High pressure gas pipe Liquid...

Страница 43: ...nd weld it as shown in the illustration Also water dripping from the wet cloth may interrupt the welding Make sure the water does not drip from the wet cloth Make sure that connected pipes does not interrupt each other or make contact with the product Vibration may cause damage to the pipes When removing the sealed pipe on the bottom side of the service valve cut it with a pipe cutter first and th...

Страница 44: ...ected to the outdoor units f Check the changes in comparison with the DVM II and III Caution Correct installation Incorrect installation Refrigerant pipes should be connected at the same or lower level than the ones connected to the outdoor unit Refrigerant pipes must be connected by the side of the product Straight section should be 300mm 12inch or more Branch joint between outdoor units must be ...

Страница 45: ...cted indoor unit without MCU for HR only This indoor unit can only be used for cooling operation Heating operation is not possible Connect indoor unit to liquid and low pressure gas pipe Change the installation option for direct connected indoor unit without MCU refer to the indoor unit installation manual k tGzG 㨰䛙G㐘㞬ὤGpt lu ki _TWZ_XYhTW_U GGG YWX_TW TXXGGG㝘䟸G a _aZ ...

Страница 46: ...e f g p 200 m 220 m 656 722 Equivalent lengthY joint 0 5 m 1 64 Distribution header 1 m 3 28 Installing withY joint and distribution header a b h 200 m 220 m 656 722 a i k 200 m 220 m 656 722 Installing only with distribution header a i 200 m 220 m 656 722 Total length of pipe m 1000 m 3281 or less Installing only with Y joint a b c d e f g h i j k l m n p 1000 m Installing withY joint and distrib...

Страница 47: ... increased by 1 grade Total length of extended pipe If the size of pipe main pipe between the first branch joint and the outdoor unit is not increased by 1 grade a b c d e f g x2 h i j k l m n p 1000 m 3281 If the size of pipe main pipe between the first branch joint and the outdoor unit is increased by 1 grade a b c d e f g x2 h i j k l m n p 1000 m 3281 EachY joint Each indoor unit h i j p 45 m ...

Страница 48: ...eader 1 m 3 28 MCU 1m 3 28 InstallingwithMCU andY joint a b h k 200m 220m 656 722 Totallength ofpipe 1000m 3281 orless Installingonlywith MCU a b c d e f g h i j 1000m 3281 InstallingwithMCU andY joint a b c q 1000m 3281 Outdoorunit Indoorunit Pipelength 10m 33 orless x 10m 33 y 10m 33 z 10m 33 Equivalent length 13m 43 orless x 13m 43 y 13m 43 z 13m 43 MCU Indoor unit Pipelength 45m 148 orless Ins...

Страница 49: ... Firstbranch joint Farthest Indoorunit 45m b h k l m q l r 90m 295 Sizeofthebranch liquidandlowpressuregaspipes b l m mustbe increasedby1grade Totallengthof extendedpipe Ifthesizeofpipe mainpipe betweenthefirstbranchjoint andtheoutdoorunit isnotincreasedby1grade a b l m x2 c d e f g h i j k n o p q r 1000m 3281 Ifthesizeofpipe mainpipe betweenthefirstbranchjoint andtheoutdoorunit isincreasedby1gra...

Страница 50: ...10mm 15mm 0 39 0 59 inch NOTE Install the branch joint within 15 of the horizon or vertical line Make sure that the pipe is not bent at where it is connected to the branch joint Keep a minimum straight line distance of 500mm 20 inch or more before connecting branch joint Install within 15 of the horizon or vertical line Minimum straight line Over 500mm 20 inch Pipe Main pipe Connect to indoor unit...

Страница 51: ...ng part Provided item Gas side Case of blocking the unused distribution header ports Connect in order For A J type distribution header Connect the distribution header to the connection pipe with the provided reducer For K Z type distribution headers Cut the provided socket according to the diameter of the connection pipe before connecting it 10mm 15mm 0 39 0 59inch NOTE Connect the indoor units in...

Страница 52: ... 15 Horizon line Horizon line Liquid side Below 15 Horizon line Below 10 Horizon line Gas side Installing the branch joint between outdoor units Installation of outdoor joints Do not install the outdoor joint in this direction Liquid pipe High pressure gas pipe Gas pipe High pressure gas pipe only applies to the H R product Refrigerant pipe installation k tGzG 㨰䛙G㐘㞬ὤGpt lu ki _TWZ_XYhTW_U GGG Y YW...

Страница 53: ...oor unit To other outdoor joint orY joint of the main pipe To other outdoor joint or outdoor unit Use the attached reducer according to the selected pipe size Pipe Reducer Reducer Pipe To other outdoor unit To other outdoor joint orY joint of the main pipe High pressure gas side To other outdoor joint or outdoor unit Connect the Outdoor joint to the pipe by cutting the outlet of the Outdoor joint ...

Страница 54: ...imum capacity of the connectable indoor units at one port 16 kW 54MBH 16 kW 54MBH 16 kW 54MBH 16 kW 54MBH The maximum capacity of the connectable indoor units 61 6 kW 210MBH 61 6 kW 210MBH 32 kW 109MBH 32 kW 109MBH Internal EEV Not included IndoorunitswithoutinternalEEV AM HNQDC cannotbeconnecteddirectlytotheMCU PleaseconnecttheseindoorunitsusingEEVkit MEV E SA MXD E K A CAUTION k tGzG 㨰䛙G㐘㞬ὤGpt l...

Страница 55: ...r unit In case of usingY connector it is only connectable for port combination at below Connectable port combination forY connector A B port C D port E F port Non connectable port combination forY connector B C port D E port non continuous port Set Dip Switch option for usingY connector 1 ON 2 3 4 1 ON 2 3 4 1 ON 2 3 4 1 ON 2 3 4 S W Option S W Option S W Option S W Option Default CombinationofA B...

Страница 56: ...s pipe connection welding Liquid pipe connection welding 70mm When installing MCU use the pattern sheet for installation that is provided with the product When welding the gas pipes protect the product with the flame proof sheet When connecting the MCU with outdoor units default direction is set in the MCU If installing opposite direction weld the enclosed copper cap in each high pressure low pres...

Страница 57: ...he indoor unit s capacity of over 11 2 kW 36 MBH UseY Joint 14 kW 48 MHB or under Connect the liquid gas pipe of indoor unit to a single port in MCU 14 28 kW 48 96 MBH UseY Joint DB97 19694A Maximum IDU Capacity 14 kW 48 MBH 28 kW 96 MBH 28 kW 96 MBH Minimum IDU Capacity 11 2 kW 36 MBH Maximum Single Port Capacity 10 kW 30 MBH 14 kW 48 MBH Installation condition in case of continuous cooling 5 14 ...

Страница 58: ...outdoor unit Pipe connection to indoor unit Gas pipe Flare Liquid pipe Flare Protect with wet towel when welding 70mm 2 75 inch 70mm 2 75 inch When installing MCU use the pattern sheet for installation that is provided with the product When welding the high low pressure gas pipe protect the product with the flame proof sheet k tGzG 㨰䛙G㐘㞬ὤGpt lu ki _TWZ_XYhTW_U GGG _ YWX_TW TXXGGG㝘䟸G a _a W ...

Страница 59: ...0 3 0 52 6 70 0 38TON AM456 XVAF 60 208 230 14 8 14 8 3 0 3 0 43 0 50 0 24 0 24 0 3 0 3 0 66 0 80 0 40TON AM480 XVAF 60 208 230 20 7 20 7 3 0 3 0 52 6 70 0 24 0 24 0 3 0 3 0 66 0 80 0 42TON AM504 XVAF 60 208 230 24 0 24 0 3 0 3 0 66 0 80 0 24 0 24 0 3 0 3 0 66 0 80 0 44TON AM528 XVAF 60 208 230 24 0 24 0 3 0 3 0 66 0 80 0 24 0 24 0 3 0 3 0 66 0 80 0 Units Module3 RLA FLA PowerSupply Nom Ton Model ...

Страница 60: ... 460 14 0 1 5 1 5 21 7 30 0 12 0 12 0 1 5 1 5 33 0 40 0 40TON AM480 XVAJ 60 460 11 4 11 4 1 5 1 5 28 7 40 0 12 0 12 0 1 5 1 5 33 0 40 0 42TON AM504 XVAJ 60 460 12 0 12 0 1 5 1 5 33 0 40 0 12 0 12 0 1 5 1 5 33 0 40 0 44TON AM528 XVAJ 60 460 12 0 12 0 1 5 1 5 33 0 40 0 12 0 12 0 1 5 1 5 33 0 40 0 Units Module3 RLA FLA PowerSupply Nom Ton Model Hz Volts Comp1 Comp2 FAN1 FAN2 MCA MOP 6TON AM072 XVAJ 6...

Страница 61: ... 0 80 0 24TON AM288 XVTF 60 208 230 28 4 28 4 3 0 3 0 70 0 80 0 28 4 28 4 3 0 3 0 70 0 80 0 Units Module3 RLA FLA PowerSupply Nom Ton Model Hz Volts Comp1 Comp2 FAN1 FAN2 MCA MOP 6TON AM072 XVTF 60 208 230 8TON AM096 XVTF 60 208 230 12TON AM144 XVTF 60 208 230 14TON AM168 XVTF 60 208 230 16TON AM192 XVTF 60 208 230 18TON AM216 XVTF 60 208 230 19 5 19 5 3 0 3 0 50 0 60 0 20TON AM240 XVTF 60 208 230...

Страница 62: ...J 60 460 8TON AM096 XVTJ 60 460 12TON AM144 XVTJ 60 460 14TON AM168 XVTJ 60 460 16TON AM192 XVTJ 60 460 18TON AM216 XVTJ 60 460 11 1 11 1 1 5 1 5 28 0 35 0 20TON AM240 XVTJ 60 460 15 5 15 5 1 5 1 5 38 0 45 0 22TON AM264 XVTJ 60 460 15 5 15 5 1 5 1 5 38 0 45 0 24TON AM288 XVTJ 60 460 15 5 15 5 1 5 1 5 38 0 45 0 5 Module combination for AM192H J AM216K J Units Module1 Module2 RLA FLA PowerSupply RLA...

Страница 63: ...wire exposed due to insulator damage occurred during removal of the sheath When the core wire is exposed it may cause fire Insulator inner cover Exposed wire core The example of exposed core wire Sheath outer cover CAUTION Power and communication cable configuration f Main power and the ground cable must be withdrawn through the knock out hole on the bottom right or right side of the cabinet f Wit...

Страница 64: ...re are risk of damage to the protection tube and extra waterproof is needed Caution for perforating the knock out hole Perforate a knock out hole by punching it with a hammer After perforating the knock out hole apply rust resisting paint around the hole When you need to pass the cables through the knock out hole remove burrs on the hole and protection the cable with a protection tape or bushing e...

Страница 65: ...ndoorunit Communication cable Outdoorunit Outdoorunit f Connect a power cable of the outdoor unit after checking that R S T 3 phase 3 wire is properly connected f Malfunction may occur if one or more of the wires among R S T phases 3 Phases 3Wires are not connected properly Malfunction Turning on off occurrence of error consecutive reset f Communication cable between indoor and outdoor units and c...

Страница 66: ... inch 0 3 0 011 0 2 0 007 0 3 0 011 0 2 0 007 0 3 0 011 0 2 0 007 0 5 0 019 0 2 0 007 0 5 0 019 0 2 0 007 0 5 0 019 0 2 0 007 0 5 0 019 0 4 0 015 d1 Standard dimension mm inch 3 4 1 8 4 5 3 16 5 8 1 4 7 7 5 16 9 4 3 8 11 4 7 16 13 3 1 2 Allowance mm inch 0 2 0 007 0 2 0 007 0 2 0 007 0 2 0 007 0 2 0 007 0 3 0 011 0 4 0 015 E Min mm inch 6 1 4 7 9 5 16 9 5 5 16 11 3 8 12 5 1 2 17 5 11 16 18 5 3 4 F...

Страница 67: ...onnector Solderless ring terminal Thin cable Thick cable Cable tie When connecting two cables to one terminal separate the solderless terminal up and down to prevent it from getting loose Place the thin cable upward and the thick cable downward Fix the power cable with a cable tie When removing the outer sheath of the power supply cable be careful not to scratch the inner sheath of the cable Make ...

Страница 68: ...2 Fix the power cable and tool by using the hook at the top side of the tool 3 Cut out the outer sheath of the power cable by revolving the tool in the direction of the arrow two or three times 4 At this situation cut out the outer sheath of the power cable by moving the tool toward the direction of the arrow 5 Slightly bend the wire and pull out the cut part of the outer sheath k tGzG 㨰䛙G㐘㞬ὤGpt l...

Страница 69: ... fire or explosion Make sure that the place where the sheath of power supply cable is removed is inside the power supply box If it is impossible you should connect the protection tube for power cable to the power supply box After arranging the power cable into the power supply box tighten the cover CAUTION Connect the ring terminal of 3 phase cable 1 Cut the power cable to an appropriate length an...

Страница 70: ...wer supply box Grounding Withdrawing the power cable f Withdrawing from the front side Connect the power cable protection tube into the power supply box as shown picture Be sure that the power supply cable is not damaged by burr on the knock out hole k tGzG 㨰䛙G㐘㞬ὤGpt lu ki _TWZ_XYhTW_U GGG W YWX_TW TXXGGG㝘䟸G a _a ...

Страница 71: ...r units installed with the outdoor unit is 16 or less F1 F2 OF1 OF2 R1 R2 F1 Terminal block with indoor unit F2 OF1 Terminal block with outdoor unit sub module OF2 R1 Terminal block with solution device R2 k tGzG 㨰䛙G㐘㞬ὤGpt lu ki _TWZ_XYhTW_U GGG X YWX_TW TXXGGG㝘䟸G a _a ...

Страница 72: ... communication cable of the outdoor unit F1 F2 to the communication cable of the MCU F1 F2 Power cable connection should be done with the solderless ring terminal Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit MCU MCU Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit MCU MCU When installing the MCU communication cable can be connected as shown above C...

Страница 73: ...tdoor unit f Connect the communication cable of the outdoor unit F1 F2 to the communication cable of the MCU F1 F2 Power cable connection should be done with the solderless ring terminal Indoorunit Indoorunit Indoorunit Indoorunit Indoorunit Indoorunit MCU MCU When installing the MCU communication cable can be connected as shown above CAUTION k tGzG 㨰䛙G㐘㞬ὤGpt lu ki _TWZ_XYhTW_U GGG Z YWX_TW TXXGGG...

Страница 74: ...unding work 3 if possible for your safety Note 2 Note 1 About grounding work 3 Grounding work must be done by an expert with qualification Check if the grounding resistance is lower than 100Ω When installing a earth leakage breaker that can cut the electric circuit within 0 5 second in case of a short circuit allowable grounding resistance should be 30 500Ω Note 2 Grounding at dry place The ground...

Страница 75: ...ion to the pressure of the nitrogen Keep it for minimum 24 hours to check if pressure drops After applying Nitrogen gas check there s any change of pressure using a pressure regulator If the pressure drops check for gas leakage If the pressure is changed apply soap water to check for leakage and check the pressure of the nitrogen gas again Maintain 1 0MPa 145psi of the pressure before performing v...

Страница 76: ...dule using a vacuum pump Make sure that check valve is installed to prevent pump oil from flowing into the pipe While the vacuum gauge pressure is less than 100 7 kPa 5Torr perform the vacuum drying for more than 1 hour and close the valve Vacuum pressure must be checked with the vacuum gauge After vacuum pump stops check whether the pressure is maintained within 100 7 kPa 5Torr for an hour Charge...

Страница 77: ...ted in below table Pipe Outer diameter Insulator Cooling Heating Remarks General 30ºC 86ºF 85 High humidity 30ºC 86ºF over 85 EPDM NBR mm inch mm inch mm inch Liquid pipe 6 35 9 52 1 4 3 8 9 3 8 9 3 8 Heating resisting temperature over 120 C 248 F 12 7 50 8 1 2 2 13 1 2 13 1 2 Gas pipe 6 35 1 4 13 1 2 19 3 4 9 52 25 4 3 8 1 19 3 4 25 1 28 58 44 45 1 1 8 1 3 4 19 3 4 32 1 1 4 50 8 2 25 1 38 1 1 2 W...

Страница 78: ...ne grade When installing the gas side and liquid side pipes leave at least 10mm 3 8 of space When the gas side and liquid side pipes are contacting each other increase the thickness of the insulation by one grade Gas pipe Liquid pipe Insulator Insulator Gas pipe 10mm 3 8 10mm 3 8 10mm 3 8 Liquid pipe Install the insulation without any gaps or cracks and use adhesive on the connection part of it to...

Страница 79: ...chased insulator Wrap the connected part with an insulator separately purchased item that has thickness of at least 10mm 0 39 inch f Use an insulator that resist heat up to 120 C Wrap the branch joint with an insulation that has thickness of at least 10mm 0 39 inch Fix securely without any gap Provided Insulator Fix securely without any gap Pipe insulator Separately purchased item Pipe insulator S...

Страница 80: ...gh the gap between the pipe and the insulation of the outdoor unit installed on the outside f Separate the cover of the pipe and close it after insulation work Only remove a knock out hole cover where the pipe will be installed If the knock out hole is open unnecessarily it must be closed If not small animals such as squirrels and rats may get into the unit through the hole and the unit may be dam...

Страница 81: ...e installation f Open the manifold gauge valve connected to the liquid side service valve and add the liquid refrigerant f If you cannot add the whole quantity of the refrigerant while the outdoor unit is stopped open the gas side and liquid side service valve Then add remaining refrigerant by pressing the refrigerant adding button of the outdoor PCB Gas side Scale R 410A Inject liquid refrigerant...

Страница 82: ...d Put on safety equipment when charging refrigerant Do not charge the refrigerant when you adjust or control other product such as indoor units or EEV kits If you charge the refrigerant with the front cabinet open be very careful with the fan on the top of the product to prevent personal injury When the ambient temperature is low in winter time do not heat the refrigerant container to speed up the...

Страница 83: ... Switch Setting Function Remarks SW51 SW52 Setting total number of installed indoor unit SW51 Tens digit SW52 Units digit Setting can be done from the main outdoor unit only sub unit setting is unnecessary Ex When 12 indoor units are installed SW51 1 SW52 2 SW53 K6 On Enable maximum capacity restriction for cooling operation Restrict excessive capacity increase when operating indoor units with sma...

Страница 84: ...for 2 seconds to save exit system will be reset Quantity of indoor units Step4 Press K1 Ready to set Step5 K2 x n times X Tens digit 0 6 Ex 03 3 units 64 64 units K4 x n times X Ones digit 0 9 K4 Press for 2 seconds automatic detection of indoor units quantity Step6 If it is heat recovery model go to step 7 Otherwise press K2 button for 2 seconds to save exit system will be reset Quantity of MCUs ...

Страница 85: ...ion Example Z 4 After selecting the function for options press and hold the K2 switch for 2 seconds Edited value of the option will be saved when entire segments blinks and tracking mode begins Edited option will not be saved if you do not end the option setting as explained in above instruction CAUTION While you are setting the option you may press and hold the K1 button to reset the value to pre...

Страница 86: ... 3 2 7 0 4 2 8 0 5 2 9 0 6 3 1 0 7 3 2 0 8 3 3 Current restriction rate Individual 0 3 0 0 100 Factory default When restriction option is set cooling and heating performance may decrease 0 1 95 0 2 90 0 3 85 0 4 80 0 5 75 0 6 70 0 7 65 0 8 60 0 9 55 1 0 50 1 1 No restriction Oil collection interval Main 0 4 0 0 Factory default 0 1 Shorten the interval by 1 2 Temperature to trigger defrost operatio...

Страница 87: ...led Factory default 0 1 LEVEL 1 When equivalent length of farthest indoor unit from the outdoor unit is between 100 170m 0 2 LEVEL 2 When equivalent length of farthest indoor unit from the outdoor unit is over 170m Energy saving setting AType PBA Main 1 0 0 0 Disabled Factory default 0 1 Enabled Energy saving mode triggers when the room temperature reaches desired temperature while operating in he...

Страница 88: ...eak Pumpdown B type PBA Main 1 9 0 0 Disabled Factory default If the gas leak occurred it should be entered in the pumpdown operation 0 1 Enabled Unused option Main 2 0 0 0 Unused option Unusedoptionbythismodel LA KIT option Main 2 1 0 0 Disabled Factory default SetwhenLAKITisinstalled 0 1 Enabled Emergency operation for indoor unit communication error Main 2 2 0 0 Disabled Factory default Whenset...

Страница 89: ...s 2 K 3 BLANK 2 5 times Pump out in Heating mode Outdoor unit address 3 K 3 BLANK 3 6 times Pump out in Heating mode Outdoor unit address 4 K 3 BLANK 4 7 times Vacuumig Outdoor unit address 1 K 4 BLANK 1 8 times Vacuumig Outdoor unit address 2 K 4 BLANK 2 9 times Vacuumig Outdoor unit address 3 K 4 BLANK 3 10 times Vacuumig Outdoor unit address 4 K 4 BLANK 4 11 times Vacuuming All outdoor units K ...

Страница 90: ...K 10 times Inverter compressor 2 check K E BLANK BLANK 11 times Fan 1 check K F BLANK BLANK 12 times Fan 2 check K G BLANK BLANK 13 times H R Auto pipe pairing H P Unused K H XX Displayoflasttwodigitsmay differdependingontheprogress 14 times End Key operation During DischargemodeofDClinkvoltage voltageofINV1andINV2willbedisplayedalternately Evenwhentheoutdoorunitpowerisoff itisdangerouswhenyoucome...

Страница 91: ...ssor 2 9 87 C 0 8 7 10 times CT sensor value Compressor 1 A 2 A 0 2 0 11 times CT sensor value Compressor 2 B 2 A 0 2 0 12 times Suction temperature C 42 C 4 2 13 times COND OUT temperautre D 42 C 4 2 14 times Temperature of liquid pipe E 42 C 4 2 15 times TOP temperature Compressor 1 F 42 C 4 2 16 times TOP temperature Compressor 2 G 42 C 4 2 17 times Outdoor temperature H 42 C 4 2 18 times EVI i...

Страница 92: ...K4 Number of press Press and hold the K4 to enter the setting Displayed content Display on segment page1 page2 1 time Main version MAIN Version ex 1412 2 times Hub version HUB Version ex 1412 3 times Inverter 1 version INV1 Version ex 1412 4 times Inverter 2 version INV2 Version ex 1412 5 times Fan 1 version FAN1 Version ex 1412 6 times Fan 2 version FAN2 Version ex 1412 7 times EEP version EEP Ve...

Страница 93: ... address you can set a value from 0 to 15 2 For each MCU ports that are connected to an indoor unit through piping set their DIP switch to ON For other MCU ports set their DIP switches to OFF You can find the address A to F of an MCU port on the indoor unit piping connection 3 If two MCU ports are connected to an indoor unit through aY joint set the relevant S W option DIP switch to the settings g...

Страница 94: ... remote control 3 Set the address of each MCU port that is connected to an indoor unit by referring to the following table You can also set the address of each indoor unit Option SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 Value 0 A Addresssetting mode 0 Theaddressofthe indoorunitwillnotbe set 1 Theaddressofthe indoorunitwillbeset 0to9 Hundredsdigit oftheindoorunit address 0to9 Tensdigitofthe indoorunitaddress ...

Страница 95: ... is turn on set the devices indoor unit MCU and others that are connected to the outdoor unit and set the options Note that before the MCU port addresses are set MCU port setting errors E213 216 217 218 may occur You can run the Automatic pipe address setting operation regardless of MCU port setting errors 6 If the OAP Outdoor Air Processing Duct or Hydro unit is connected set the pipe addresses m...

Страница 96: ...yed alternately Indoor unit data SEG 1 2 indoor unit address SEG 3 4 error status 00 An MCU port is not disabled or a pipe is not connected 01 Cooling only indoor unit is connected to MCU 02 The shared setting for two ports is incorrect Example When the MCU port connected to the indoor unit 12 is disabled E191 and 1200 are displayed alternately If two or more indoor units have setting errors the d...

Страница 97: ...nsures space for service Is the outdoor unit fixed securely to withstand any external force Indoor unit Have you checked the external surface and the inside of the indoor unit Is there enough space for service Have you checked if the center of the indoor unit is ensured and it is installed horizontally Refrigerant pipe work Have you selected correct pipes Are the liquid and gas valve open Is the t...

Страница 98: ...e cable for the communication cable Is the length of the wire within allowed range Is the wiring route correct Setting address Did you set the address of the indoor and outdoor units properly Did you set the address of the indoor and outdoor units properly When using multiple remote controllers Option If there is a possibility of the outdoor unit from vibrating check whether the anti vibration fra...

Страница 99: ...ration to pre heat the crank case heater 3 Before supplying the power use a voltmeter and phase tester to check the voltage and the phase R S T terminal check the 460V between wires R S S T T R AM XV J Model only 230V between wires R S S T T R AM XV F Model only 4 When the power is supplied outdoor unit will execute tracking to check the indoor unit connection and other optional functions 5 Write ...

Страница 100: ... a result report Refer to service manual for further actions if you have any items with inspection required sign on the result report After taking appropriate measure for the items with inpection required sign run the auto trial operation again 4 Check the following items by running trial operation cooling heating Check if cooling heating operation performs normally Individual indoor unit control ...

Страница 101: ...s Yes Yes Yes Take corrective measures No Is the ball valve on the outdoor unit opened Take corrective measures No Has the correct amount of additional refrigerant been injected into the indoor unit and liquid line Take corrective measures No Are the 4 way valve Main EEV and pressure sensors operating properly Take corrective measures No Is the operation cycle normal k tGzG 㨰䛙G㐘㞬ὤGpt lu ki _TWZ_XY...

Страница 102: ...iquidpipeatthesametimewhencheckingservicevalve ballvalve When 4way valve Main EEV detection is needed run heating trial operation for more than 1 hour and analyze the data to checkforaproblem If there s frost formed in outdoor unit or the outdoor unit is operating in defrost operation it may be hard to detect problem normally In this case perform Trial operation or Forced defrost operation to elim...

Страница 103: ...roperly connected to the PBA Is the deviation between pressure sensors on outdoor units greater than 0 2MPa Replace the Hub PBA No Is the pin to pin voltage between pins 3 and 4 of the pressure sensor terminal on the Hub PBA 5V Replace the pressure sensor No Is the actual pressure different from the value on the pressure sensor Yes Yes No The actual pressure can be checked by calculating the satur...

Страница 104: ...required error will be displayed on all installed outdoor units If pressure sensor check is required outdoor units will terminate auto trial operation mode automatically To check for the pressure sensor with the problem run trial operation for more than 1 hour and analyze the data to check for a problem To replace a component or inspect the PBA be sure to cut off the power supply first If inspecti...

Страница 105: ...ment not available Connect S Net Pro Judge the amount of refrigerant Judgment on the amount of refrigerant Normal Excessive Insufficient Satisfythetemperaturecondition Satisfythetemperaturecondition Check the amount of refrigerant Input S CHECKER signal Check stability Check stability End Yes No No Yes After refrigerant amount detection is finished if you see K9 Ed on the display and cannot check ...

Страница 106: ... may trigger system protection operation depending on the installation environment In this case the result of refrigerant amount check may not be accurate Actions to take for the check result Excessive amount of refrigerant Discharge 5 of total amount of refrigerant and restart the refrigerant amount check Insufficient amount of refrigerant Add 5 of the total amount of refrigerant and restart the ...

Страница 107: ...107 ENGLISH MEMO k tGzG 㨰䛙G㐘㞬ὤGpt lu ki _TWZ_XYhTW_U GGGXW YWX_TW TXXGGG㝘䟸G a _a ...

Страница 108: ...DB68 03812A 08 k tGzG 㨰䛙G㐘㞬ὤGpt lu ki _TWZ_XYhTW_U GGGXW_ YWX_TW TXXGGG㝘䟸G a _a ...

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