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Airwell AWAU-YDV1010-H13, Service Manual

The Airwell AWAU-YDV1010-H13 Service Manual is available for free download on manualshive.com. This comprehensive manual provides detailed instructions for maintaining and troubleshooting your Airwell unit. Ensure your system operates at peak performance by downloading this essential manual today.

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44

5. Wiring diagram

Q

P

L1
L2
L3

N

N

L3

L2

L1

Indoor 

Units

Terminal Block for 

Communication

Terminal 

Block for 

Power

POWER

：3N～,380V,

50/60Hz

B

R W BL

Filter

R S T

N

R

W

BL

Note:

1.

The dashed part is used 

for

 the double compressor

s

 model.

2.

The colours use these letters for short

W:White  B:Black  R:Red  GR:Gray  BL:Blue  Y:Yellow  G:Green  

BR:Brown  OR:Orange

CNDC1

CNDC2

CNDR1

CN15V1

CN4

CN5

CN6

CN9

CN10

CN1

 CN2

5 4

1

2

3

3 2 1

T3.15A-250V

COMP

W

V

U

N

P

+ -

Capacitor

+ -

PTC

( )

+

(  )

～

(  )

～

～

(  )

( )

-

Shunt 

Resistance

LED1 LED2

LED3

DCCT_U

DCCT_W

CN3

3 2 1

CN8

CN7

W

U

V

W

R

N

S

LEVB

LEVA1

LEVA2

LEVC

BM1

BM2

BM4

BM3

ON

SW09

SW10

SW11

LED1

LED2

SW1 SW2

DCFAN1

DCFAN2

3

2

1

4

3

2

1

3

2

1

3

2

1

4

3

2

1

4

3

2

1

4

3

2

1

4

3

2

1

3

2

1

3

2

1

3

2

1

3

2

1

3

2

1

3

2

1

3

2

1

3

2

1

SV21

4WV

SV1

SV6

SV9

SV10

SV11

SV181 SV182

FAN2

SV3

FAN1

SV32

CHacc

CH1

CH2

B

A

C

INV1

INV2

INV3-APY

P

Q

B

A

GND

IN-COM

OUT-COM

Outdoor 

Units

CN39

CN49

CN48

CN47

CN46

CN45

CN44

CN43 CN42

CN41

CN34

CN50

CN40

CN38

CN37

CN33

L1
L2
L3

N

N

L3

L2

L1

Filter

R
W
BL

R BL R W BL

CNDC1

CNDR1

CN15V1

CN4

CN10

CN1

CN2

5 4

1

2

3

3 2 1

T3.15A-250V

COMP

W

V

U

N

P

+ -

Capacitor

+ -

PTC

( )

+

(  )

～

(  )

～

～

(  )

( )

-

Shunt 

Resistance

LED1 LED2

LED3

DCCT_U

DCCT_W

CN3

3 2 1

CN8

CN7

W

U

V

W

CN30

CN57

CN28

CN31

CN29

CN23

CN56

CN55

CN32

FU

E2

FU

SE1

5A

 2

50VA

C

3.

15

A 

25

0V

AC

H

PS

2

HPS1

C

N

22

CN21

C

T1

C

N

9

P

L

s

C

N

8

TS

2

C

N

35

TS

U

C

C

N

2

To

ilp

C

N

15

T

oil

2

C

N

36

Ts

C

N

1

To

ci

1

C

N

12

Ta

o

C

N

11

Ts

1

C

N

10

Tli

qs

c

C

N

13

Ts

co

C

N

14

T

d1

C

N

3

Td

2

C

N

4

P

d2

C

N

20

P

S

C

N

6

P

d1

C

N

5

To

il1

C

N

17

Td

ef

1

C

N

16

To

ci

2

C

N

7

Td

ef

2

C

N

52

6

3

2

1

5

4

6

3

2

1

5

4

6

3

2

1

5

4

6

3

2

1

5

4

M

M

M

M

6

3

2

1

5

4

M

6

3

2

1

5

4

M

CNA1

CNA2

F(

5A

)

F(

5A

)

FAN2

FAN1

Pd2

Ps

Pd1

Symbol definition

Sensor

Terminal

HPS2 CN22

Toci2 CN7

Toil2 CN36

Ts

CN1

Toci1 CN12

Tao CN11

Ts1 CN10

Tliqsc CN13

Tsco CN14

Pd1

B

Y

W

R

GR

R

W
BL

Y

/

G

AC Contactor

B

W

W

B

Reactor

W

W

BL

FUSE

G

W

W

W

W

W

B

W

W

BL

Y

W

BL

Inverter Driver

BL

Y

W

BL

B

W

W

W

W

B

Y

W

Y

/

G

R
GR

R

W
BL

AC Contactor

B

W

W

B

Reactor

W

W

BL

Radiator 

Temperature 

Sensor

FUSE

G

A

B

R

ea

ct

or

C

D

D

D

D

CN27

D

CN6

W

CN5

W

W

CN9

3

P

Rectifier

Inverter Control Board

Inverter Control Board

Radiator 

Temperature 

Sensor

HPS1

CT1

PLs

TS2

TSUC

Tdef2

Td1

PS

Toilp

Td2

Pd2

Pd1

Toil1

Tdef1

LEVB

LEVA1

LEVA2

LEVC

High pressure sensor

Detect the oil temp. of 

compressor

Detect the defrosting 

temp.

SH control in sub-cooler 

control

SH control in heating

CN4

CN20

CN5

CN17

CN16

CN24

CN25

CN26

CN58

Liquid pipe pressure sensor

(used for customized model )

Detect the outdoor gas 

pipe temp.

Detect the defrosting 

temp.

Current detector

High pressure switch

Low pressure sensor

Detect the oil balance 

pipe temp.

CN52

CN2

CN35

CN8

CN9

CN21

CN3

CN6

CN15

Description

Detect SH temp. during

sub

-

cool

er

control

Dectect liquid pipe temp. SC 

during sub-cooler control

Detect suction temp. of 

INV compressor

Detect ambient temp.

Detect SH temp. in 

heating

Detect the suction temp. 

of gas-liquid seperator
Detect the oil temp. of 

the comprssor

High pressure switch

High pressure sensor

Inverter Driver

(

us

ed

 in

 s

pe

cia

l 

cu

st

om

 m

ade

 m

od

el

)

(

used for 

customized

 model

)

GR

GR

CT1

CN9

PLs

CN8

TS2

CN35

TSUC

CN2

Toilp

CN15

Toil2

CN36

Ts

CN1

Toci1

CN12

Tao

CN11

Ts1

CN10

Tliqsc

CN13

Tsco

CN14

Tdef2

CN52

P

d1

(

used in special

custom made model

)

Td1

CN3

Td2

CN4

Pd2

CN20

PS

CN6

Pd1

CN5

Toil1

CN17

Tdef1

CN16

Toci2

CN7

P

d2

P

s

P

d1

Sensor

Terminal

Description

Sensor

Terminal

Description

Detect SH temp. in 

heating

Detect suction temp. of 

INV compressor

Detect discharging temp. 

of INV compressor

Detect discharging temp. 

of INV compressor

SH control in heating

Liquid pipe pressure sensor

(used for customized model )

Summary of Contents for AWAU-YDV1010-H13

Page 1: ...SYJS 03 2017 REV A Edition 2017 03 Service Manual Flow Logic III...

Page 2: ...ation location 65 9 4 Unit transport and installation 67 9 5 Construction of refrigerant pipe 68 9 6 Discharge pipe works 81 10 Branch pipe dimensions 86 11 Gather pipe dimension 88 12 Trial operation...

Page 3: ...tion Two pieces condenser Two stage sub cooling added sub cooler in condenser 1 1 2 High reliable Back up running Back up running available not only in combination system but also in single module sys...

Page 4: ...n Optimal temperature control 1 When a multiple number of indoor units are connected an insufficient or excess amount of refrigerant may be supplied to indoor units depending on the difference in leng...

Page 5: ...4 H13 50 4 AWAU YDV560 H13 56 AWAU YDV615 H13 DROP ONLY DROP ONLY 61 5 AWAU YDV680 H13 68 AWAU YDV730 H13 DROP ONLY DROP ONLY 80 AWAU YDV800 H13 85 AWAU YDV850 H13 90 4 AWAU YDV904 H13 95 4 AWAU YDV95...

Page 6: ...20 H13 192 AWAU YDV1975 H13 DROP ONLY DROP ONLY DROP ONLY 197 5 AWAU YDV2040 H13 204 Note The single module capacity range of Flow Logic III is from 8HP to 24 HP In one system too much difference of c...

Page 7: ...ELECTRIC Model ANB52F ANB52F Type DC INV SCROLL DC INV SCROLL Compressor quantity 1 1 Capacity W 17200 17200 Power input W 5250 5250 Rated current RLA A 18 5 18 5 Speed rps 60 60 Crankcase heater W 38...

Page 8: ...mm 19 05 22 22 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 Outdoor higher than indoor 110 Indoor higher t...

Page 9: ...nd MITSUBISH ELECTRIC Model ANB52F ANB66F Type DC INV SCROLL DC INV SCROLL Compressor quantity 1 1 Capacity W 17200 22000 Power input W 5250 6500 Rated current RLA A 18 5 23 7 Speed rps 60 60 Crankcas...

Page 10: ...l pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 Outdoor higher than indoor 110 Indoor higher than outdoor 110 In...

Page 11: ...ANB42F 2 ANB52F 2 Type DC INV SCROLL DC INV SCROLL Compressor quantity 2 2 Capacity W 13900 13900 17200 17200 Power input W 4160 4160 5250 5250 Rated current RLA A 15 2 15 2 18 5 18 5 Speed rps 60 60...

Page 12: ...e mm 28 58 28 58 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 Outdoor higher than indoor 110 Indoor higher...

Page 13: ...del ANB52F 2 ANB66F 2 Type DC INV SCROLL DC INV SCROLL Compressor quantity 2 2 Capacity W 17200 17200 22000 22000 Power input W 5250 5250 6500 6500 Rated current RLA A 18 5 18 5 23 7 23 7 Speed rps 60...

Page 14: ...88 Gas pipe mm 28 58 28 58 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 Outdoor higher than indoor 110 Ind...

Page 15: ...ANB52F ANB66F Type DC INV SCROLL DC INV SCROLL Compressor quantity 2 2 Capacity W 22000 22000 17200 22000 Power input W 6500 6500 5250 6500 Rated current RLA A 23 7 23 7 18 5 23 7 Speed rps 60 60 Cra...

Page 16: ...pipe mm 15 88 19 05 Gas pipe mm 28 58 31 8 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 Outdoor higher than...

Page 17: ...2 Type DC INV SCROLL DC INV SCROLL Compressor quantity 2 3 Capacity W 22000 2 22000 13900 13900 Power input W 6500 2 6500 4160 4160 Rated current RLA A 23 7 2 23 7 15 2 15 2 Speed rps 60 60 Crankcase...

Page 18: ...mm 19 05 19 05 Gas pipe mm 31 8 31 8 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 Outdoor higher than indoo...

Page 19: ...SCROLL Compressor quantity 3 4 Capacity W 22000 17200 17200 13900 13900 17200 17200 Power input W 6500 5250 5250 4160 4160 5250 5250 Rated current RLA A 23 7 18 5 18 5 15 2 15 2 18 5 18 5 Speed rps 60...

Page 20: ...ping Liquid pipe mm 19 05 19 05 Gas pipe mm 31 8 31 8 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 Outdoor...

Page 21: ...ressor quantity 4 4 Capacity W 13900 13900 17200 17200 17200 17200 17200 17200 Power input W 4160 4160 5250 5250 5250 5250 5250 5250 Rated current RLA A 15 2 15 2 18 5 18 5 18 5 18 5 18 5 18 5 Speed r...

Page 22: ...rant piping Liquid pipe mm 19 05 19 05 Gas pipe mm 38 1 38 1 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 O...

Page 23: ...NV SCROLL DC INV SCROLL Compressor quantity 4 4 Capacity W 17200 17200 2 17200 17200 22000 22000 Power input W 5250 5250 2 5250 5250 6500 6500 Rated current RLA A 18 5 18 5 2 18 5 18 5 23 7 23 7 Speed...

Page 24: ...Liquid pipe mm 19 05 19 05 Gas pipe mm 38 1 38 1 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 Outdoor highe...

Page 25: ...L Compressor quantity 4 4 Capacity W 17200 17200 22000 22000 22000 22000 22000 22000 Power input W 5250 5250 6500 6500 6500 6500 6500 6500 Rated current RLA A 18 5 18 5 23 7 23 7 23 7 23 7 23 7 23 7 S...

Page 26: ...Refrigerant piping Liquid pipe mm 19 05 19 05 Gas pipe mm 38 1 38 1 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor uni...

Page 27: ...CROLL DC INV SCROLL Compressor quantity 4 5 Capacity W 22000 22000 2 22000 17200 17200 2 Power input W 6500 6500 2 6500 5250 5250 2 Rated current RLA A 23 7 23 7 2 23 7 18 5 18 5 2 Speed rps 60 60 Cra...

Page 28: ...ant piping Liquid pipe mm 19 05 19 05 Gas pipe mm 38 1 38 1 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 Ou...

Page 29: ...13900 2 17200 17200 13900 13900 17200 17200 17200 17200 Power input W 4160 4160 2 5250 5250 4160 4160 5250 5250 5250 5250 Rated current RLA A 15 2 15 2 2 18 5 18 5 15 2 15 2 18 5 18 5 18 5 18 5 Speed...

Page 30: ...essure MPa 4 15 4 15 Refrigerant piping Liquid pipe mm 19 05 19 05 Gas pipe mm 38 1 38 1 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Dif...

Page 31: ...6 Capacity W 13900 13900 17200 17200 2 17200 17200 17200 17200 2 Power input W 4160 4160 5250 5250 2 5250 5250 5250 5250 2 Rated current RLA A 15 2 15 2 18 5 18 5 2 18 5 18 5 18 5 18 5 2 Speed rps 60...

Page 32: ...Refrigerant piping Liquid pipe mm 19 05 19 05 Gas pipe mm 41 3 41 3 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit...

Page 33: ...ROLL DC INV SCROLL Compressor quantity 6 6 Capacity W 17200 17200 3 17200 17200 2 22000 22000 Power input W 5250 5250 3 5250 5250 2 6500 6500 Rated current RLA A 18 5 18 5 3 18 5 18 5 2 23 7 23 7 Spee...

Page 34: ...Liquid pipe mm 19 05 19 05 Gas pipe mm 41 3 41 3 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor outdoor unit 1 90 Outdoor highe...

Page 35: ...00 17200 2 22000 22000 17200 17200 22000 22000 22000 22000 Power input W 5250 5250 2 6500 6500 5250 5250 6500 6500 6500 6500 Rated current RLA A 18 5 18 5 2 23 7 23 7 18 5 18 5 23 7 23 7 23 7 23 7 Spe...

Page 36: ...4 15 4 15 Refrigerant piping Liquid pipe mm 19 05 22 22 Gas pipe mm 41 3 44 5 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor o...

Page 37: ...ity 6 6 Capacity W 17200 17200 22000 22000 2 22000 22000 22000 22000 2 Power input W 5250 5250 6500 6500 2 6500 6500 6500 6500 6500 6500 Rated current RLA A 18 5 18 5 23 7 23 7 2 23 7 23 7 23 7 23 7 2...

Page 38: ...15 4 15 Refrigerant piping Liquid pipe mm 22 22 22 22 Gas pipe mm 44 5 44 5 Oil pipe mm 9 52 9 52 Total pipe length m 1000 1000 Max pipe length Equivalent actual m 190 165 190 165 Max Diff indoor out...

Page 39: ...TSUBISH ELECTRIC Model ANB66F 2 ANB66F 2 ANB66F 2 Type DC INV SCROLL Compressor quantity 6 Capacity W 22000 22000 3 Power input W 6500 6500 3 Rated current RLA A 23 7 23 7 3 Speed rps 60 Crankcase hea...

Page 40: ...pe length Equivalent actual m 190 165 Max Diff indoor outdoor unit 1 90 Outdoor higher than indoor 110 Indoor higher than outdoor Standard Diff indoor outdoor unit m 50 Outdoor higher than indoor 40 I...

Page 41: ...n bolt position J F I J F I J F I J F I Foundation bolt hole dimension D right C right C front D down C L H G G G Note when install air duct the air duct inside is rectangle length width 660 C back M...

Page 42: ...G M M F J M foundation bolt position Foundation bolt position Foundation bolt hole dimension Content Refrigerant pipe outlet Power line entrance Foundation bolt hole Drain soft pipe hole Code C D F G...

Page 43: ...ccumulator Tdef1 Tao Toil1 SV 10 Ts1 Toilp 4WV O S Capillary SV 11 SV 9 Unloading valve Oil balance pipe Dry filter Pd1 SV 1 a SV 31 Tdef2 TC1 TC2 Tai strainer EEV TC1 TC2 Tai Indoor 1 Connect to next...

Page 44: ...1 Connect to next indoor strainer Indoor 2 EEV strainer strainer Gas pipe Operation valve flared Service valve Service valve Subcooled coil pipe Subcooled coil pipe Accumulator Gas liquid seperator Op...

Page 45: ...ce of the low pressure side together with the operating outdoor unit to prevent liquid return AC220V 2A SV9 The outdoor unit for oil discharging starts SV9 for oil balancing during oil balance among m...

Page 46: ...6 Ts CN1 Toci1 CN12 Tao CN11 Ts1 CN10 Tliqsc CN13 Tsco CN14 Pd1 B Y W R GR R W BL Y G AC Contactor B W W B Reactor W W BL FUSE G W W W W W B W W BL Y W BL Inverter Driver BL Y W BL B W W W W B Y W Y G...

Page 47: ...way m Liquid 15 88 Gas 28 58 Liquid 15 88 Gas 28 58 0 95 1 00 0 90 0 85 0 80 0 20 40 60 80 100 120 140 160 180 AWAU YDV400 H13 AWAU YDV335 H13 DROP ONLY 0 0 1 0 2 1 0 4 1 0 6 1 0 8 1 0 2 0 4 0 6 0 8...

Page 48: ...Liquid 19 05 Gas 31 8 Liquid 19 05 Gas 31 8 AWAU YDV730 H13 DROP ONLY Liquid 22 22 Gas 38 1 AWAU YDV904 H13 AWAU YDV954 H13 AWAU YDV800 H13 AWAU YDV850 H13 0 2 0 4 0 6 0 8 0 0 1 0 2 1 0 4 1 0 6 1 0 8...

Page 49: ...s 38 1 Liquid 19 05 Gas 38 1 AWAU YDV1175 H13 DROP ONLY Liquid 22 22 Gas 38 1 Liquid 22 22 Gas 38 1 AWAU YDV1240 H13 AWAU YDV1295 H13 DROP ONLY AWAU YDV1360 H13 AWAU YDV1408 H13 0 0 2 0 4 0 6 0 8 0 0...

Page 50: ...1 3 Liquid 19 05 Gas 41 3 Liquid 22 22 Gas 38 1 Liquid 22 22 Gas 41 3 Liquid 22 22 Gas 41 3 AWAU YDV1680 H13 AWAU YDV1735 H13 DROP ONLY AWAU YDV1800 H13 AWAU YDV1855 H13 DROP ONLY 0 0 2 0 4 0 6 0 8 0...

Page 51: ...compensation factor Pipe length of single way m Liquid 22 22 Gas 44 5 Liquid 22 22 Gas 44 5 Liquid 22 22 Gas 44 5 Liquid 22 22 Gas 44 5 Liquid 22 22 Gas 44 5 Liquid 22 22 Gas 44 5 1 00 Note When the...

Page 52: ...V400 H13 Total capacity of running indoor unit group Total capacity of running indoor unit group Total capacity of running indoor unit group Total capacity of running indoor unit group Total capacity...

Page 53: ...34 9 38 1 41 3 44 5 47 6 50 8 Joint 90 elbow 0 25 0 3 0 35 0 4 0 45 0 55 0 6 0 65 0 7 0 75 0 8 0 85 Unit m apice B Capacity compensation suitable for outdoor unit frosting The wet bulb temperature of...

Page 54: ...ONLY AWAU YDV680 H13 Modifica tion coeffici ent Modifica tion coeffici ent Modific ation coeffici ent Modifica tion coeffici ent Modifica tion coeffici ent Modifica tion coeffici ent Total capacity o...

Page 55: ...ation value for cooling and heating B Capacity compensation suitable for outdoor outlet static pressure Outdoor outlet static pressure Pa 0 10 20 30 40 50 60 70 80 Adjustment coefficient 1 1 0 99 0 98...

Page 56: ...54 7 Operation range...

Page 57: ...ve band level Octave band center frequency Octave band sound pressure level Limit of audible continuous noise Cooling Heating Octave band center frequency Octave band sound pressure level Limit of aud...

Page 58: ...ing Octave band center frequency Octave band center frequency AWAU YDV400 H13 Cooling Heating Octave band center frequency Octave band center frequency AWAU YDV450 H13 Cooling Heating Octave band cent...

Page 59: ...04 H13 AWAU YDV560 H13 AWAU YDV615 H13 DROP ONLY Cooling Heating Octave band center frequency Octave band center frequency AWAU YDV680 H13 Cooling Heating Octave band center frequency Octave band cent...

Page 60: ...result in injury etc If installation and maintenance require to operate inside the unit the current should be cut off before the operation or electric shock will be induced If installation requires t...

Page 61: ...ating valve has been open the refrigerant will leak seriously thus resulting in cold injury and other injury Besides it will have the air in the refrigeration system and thus lead to abnormal high pre...

Page 62: ...nowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved Children shall not play with the appliance Cleaning and us...

Page 63: ...cause water leakage water dropping moistening of household articles etc Connect ground wires correctly grounded Ground wires cannot be connected to gas pipe water pipe lightning rod telephone or othe...

Page 64: ...for refrigerant pipe we also change machining dimension of refrigerant flared pipe and opposite side dimension of flared nut When construction and maintenance prepare the R410A special tools according...

Page 65: ...r connection based on the manual It can be used in combination with the following indoor units Model of outdoor unit Combination type Quantity of units connected Total capacity of indoor units availab...

Page 66: ...20 H13 Combined 20HP 24HP 24HP 4 64 960 2496 AWAU YDV1975 H13 DROP ONLY DROP ONLY Combined 22HP 24HP 24HP 4 64 988 2568 AWAU YDV2040 H13 Combined 24HP 24HP 24HP 4 64 1020 2652 Notes Capacity allocatio...

Page 67: ...ow area install stand and snow mantle to avoid the snow burying the unit body Don t adopt centralized drainage in snow area D Don t install the unit in place subject to possible leakage of flammable g...

Page 68: ...icted In general reserve at least 10mm L5 and L6 at both sides of unit body during installation Reference Dimensions of all outdoor unit series 8P 24P are 1350mm 720mm When installing single unit Wall...

Page 69: ...e and cloth liner 1 Position of fixing bolt Please use 4 fixing bolts M10 to fasten fixing feet of outdoor unit The bolts with specification of 20mm are preferable 2 Base During setting confirm base s...

Page 70: ...rmining pipe specifications Keep specifications of indoor unit consistent with installation site and select them according to the following contents 1 Restriction of piping During pipe construction ma...

Page 71: ...talling it When installing pipes make sure to follow the restrictions on the maximum length total pipe length allowable length of pipe to the first branch pipe allowable height difference level differ...

Page 72: ...be 15 88 9 52 36 56 12 7 6 35 71 140 15 88 9 52 226 300 25 4 Braze 9 52 450 600 28 58 12 7 1 When pipe length between indoor nearest branch pipe 15m adjust in accordance with following criteria If ind...

Page 73: ...e the first branch pipe diameter Outdoor horse power Main pipe Enlarged main pipe Gas pipe Liquid pipe Gas pipe Liquid pipe 8HP 19 05 9 52 22 22 12 7 10HP 22 22 9 52 25 4 12 7 12 14HP 25 4 12 7 28 58...

Page 74: ...pipe gas and liquid sides in a strictly horizontal or vertical direction 5 Selection of indoor branch pipe Selection method of branch pipe Branch pipe sizes vary due to different connection capacitie...

Page 75: ...oard for signal line connecting Terminal board for power line connecting D front C front C right D right C back Back Connector size of refrigerant pipe plane graph Back Base removal position Marks A R...

Page 76: ...ly It is necessary to protect pipe ends by welding them after squashing or by wrapping them tightly with tape to prevent entry of moisture and foreign substances Try to bend pipe around a large radius...

Page 77: ...the flared part Adopt brazing for connecting outdoor unit gas pipes with refrigerant pipes and refrigerant pipe with branch pipes It is necessary to charge nitrogen while welding Otherwise a mass of...

Page 78: ...ng the airtight test To conduct airtight test by pressurizing the refrigerant pipe to design pressure of the product via nitrogen use connecting devices shown as below Never use chlorine refrigerant o...

Page 79: ...g Carry out vacuum pumping from the check interface of operating valve at liquid side and from both sides of operating valve at gas side Make sure to perform vacuum pumping for balancing oil pipe as w...

Page 80: ...oil pipe 4 9 MAX 11 8 16 2 MAX 24 5 8 8 MAX 14 7 Refer to 2 2 on site pipe construction for tightening torque of tapered nut 4 Seal in the charged additional refrigerant Seal in the charged additional...

Page 81: ...indicate the refrigerant types pink for R410A and ensure there is no error Never use charging cylinder Refrigerant composition may be changed when R410A is transferred to the cylinder When charging th...

Page 82: ...and liquid pipes C Carry out heat insulation to gas side and liquid side at the same time In order to fit pipe closely with heat insulation material wrap it up with outer packaging tape along with co...

Page 83: ...leakage protector must be installed Otherwise it may cause electric shock and fire accidents Power supply should not be connected before installation and maintenance should be conducted after the powe...

Page 84: ...wire connection 1 Wire removal method As shown in Figure 2 1 in Page 16 the wire can be removed from the front the right the left and the bottom When connecting the wire on site please cut off the sem...

Page 85: ...of outdoor unit power supply three phase power supply of 380V and 50 60Hz Item Model Power supply Minimum cross section area of power wire mm2 Wiring length m Circuit breaker A Rated current of leakag...

Page 86: ...gth is out of range All the shielding layers of signal wire should be connected together with one end grounded Total length of signal wire should not be more than 1000 m 3 Essentials in signal wire co...

Page 87: ...6 The wiring diagram shows only general connection points excluding installation details with special requirements 7 All the equipment sets should be equipped with switch and fuse for power circuit i...

Page 88: ...12 9 28 58 180 323 ID12 9 22 22 22 2 ID25 6 ID28 8 25 4 ID25 6 ID28 8 ID22 4 ID19 3 ID16 1 388 ID6 5 ID9 7 19 05 25 4 ID16 1 ID16 1 ID12 9 ID16 1 ID12 9 ID9 7 55 6 35 ID9 7 ID19 3 ID22 4 ID25 6 ID16 1...

Page 89: ...22 ID12 9 ID16 1 100 12 7 ID9 7 ID32 22 22 19 05 TAU2040 ID35 1 38 1 ID49 Gas side branch pipe Gas side connection of branch pipe Model Liquid side branch pipe Liquid side connection of branch pipe 4...

Page 90: ...15 0 235 5 5 285 5 5 86 A B Mark Suction gas side Liquid side Side ID32 0 15 0 ID28 8 0 15 0 ID25 6 0 15 0 ID22 4 0 15 0 ID28 8 0 15 0 38 1 1 3 28 58 1 1 75 82 5 5 ID19 2 0 15 0 28 58 1 1 ID28 8 0 11...

Page 91: ...s displaying and whether the displayed data on dip switch panel and the tube are variable 2 For VRF outdoor unit indoor unit number displayed on the digital tube is consistent with the actual number w...

Page 92: ...the indoor units are running simultaneously So all the other indoor units should be set in stopped condition 3 2 1 Whether the operation light of wired controller is on Whether the LCD standby of wire...

Page 93: ...g and the wired controller LCD preheating is turned on In starting of oil temperature preheating In control of oil return in heating mode In the process of defrosting in heating mode Resistance of TC2...

Page 94: ...t Whether the LED green and red on control base board of the indoor unit is Whether the fuse of indoor unit PCB board is normal Check the power supply wire of indoor unit The transformer of Indoor uni...

Page 95: ...f indoor unit Whether there is abnormal sound Normal Set the operation to air supply mode and press the operation switch Check the indoor unit fan fan motor and air blower circuit Check the surroundin...

Page 96: ...the operation switch for more than 5 seconds in shutdown mode Make all the indoor units operate simultaneously Normal operation condition of the compressor rotation direction of the blade Check and t...

Page 97: ...d down the operation switch for more than 5 seconds in shutdown mode Make all indoor units operate simultaneously Normal operation condition of the compressor rotation direction of the blade Check and...

Page 98: ...ndoor 18 32 C Outdoor 25 35 C Low pressure 0 6 1 0 MPa Heating at the maximum frequency High pressure 2 2 3 0 MPa Indoor 15 25 C Outdoor 5 10 C Low pressure 0 3 0 8 MPa Values after 15 minute operatio...

Page 99: ...id valve Indoor unit Temperatures of gas pipe and liquid pipe opening angle of electronic expansion valve Display of failure 3 Test device can display failures of the unit during operation moreover it...

Page 100: ...98 13 Outdoor control board photo Outdoor PCB 0151800158 photo SW1 BM1 BM2 BM3 BM4 SW9 SW10 SW11 SW2 MSG1 MSG2 LED1 LED3 LED2 SW6...

Page 101: ...51800070 Note 1 Power module 0150400941 match with power module driver board 0151800090B control the compressor ANB66F 2 Power module 0151800070 match with power module driver board 0151800090 control...

Page 102: ...100 Power module driver board 0151800090B and 0151800090...

Page 103: ...101 Filter board MHW505A012...

Page 104: ...ose priority is set as 1 3 not operates with the highest priority Setting of group class the setting of physical master unit is valid for the whole unit For example setting of quiet anti snow piping o...

Page 105: ...Introduction BM2_1 Quiet running function OFF Quiet running function is unavailable default Group class physical master unit is valid ON Quiet running function is available BM2_2 Anti snow function O...

Page 106: ...otocol indoor need set the dip switch BM4 6 to ON position BM4 Definition Introduction BM4_1 Indoor quantity lock selection OFF Available with the quantity lock function Group class physical master un...

Page 107: ...t version is V0 1 4 Indoor abnormal Display indoor failure code no failure display 0 5 Indoor capacity Indoor capacity Unit W a decimal 1 5 HP displays 1 5 6 Indoor EEV open angle Electronic expansion...

Page 108: ...at 13 0 0 press SW2 UP for 2s continuously display 1111 thus history fault record can be cleared If capacity is more than 135 or less than 50 startup is not allowed and digital tube 000 will display...

Page 109: ...he valve fully and press SW1 DOWN to close the valve fully 2 min later quit the setting condition automatically Press SW1 DOWN for 2s continuously display 0000 then to set and stop flashing Note 0 470...

Page 110: ...MG2 display 0 2 unit No 0 15 Pressure of Pl Unit kg 2 decimals 1 15 Ambient temperature of Tao Unit C 2 15 Pressure temperature of Pd1_temp 3 15 Pressure temperature of Pd2_temp 4 15 Pressure temperat...

Page 111: ...on Operation methods 0 0 2 Refrigerant type 407A stands for 407 refrigerant 410A stands for 410A refrigerant static display R22 stands for 22 refrigerant 0 1 2 Outdoor total capacity 48 0 stands for 4...

Page 112: ...shows one outdoor and 5 indoors are abnormal To check the abnormal units by digital tube indoor X_X_12 outdoor X_0_0 Press SW1 DOWN for 2s continuously display 0000 and stops 0 11 2 Operation detecti...

Page 113: ...ration without snow prevention and 1 indicates the operation with snow prevention 15 9 2 Operation setting of wind speed of sub unit FAN of ThermoOff during operating of heating main unit 0 indicates...

Page 114: ...onduct target Pd or target Ps control 3min later if Td SH is lower than 25 the frequency goes up to 100rps and withdrawal from the starting until the Td SH is higher than25 or the starting time reache...

Page 115: ...me time the priority can be shifted directly 2 When all of outdoor unit and compressor operate in the process of oil return and deforesting they can shift the priority 3 When outdoor unit and compress...

Page 116: ...at the same time and the two compressors in outdoor unit 1 continue to operate 7 When the total operation output ratio of the outdoor unit 1 declines to the 25 the No 2 compressor of outdoor unit 1 w...

Page 117: ...ever if the high pressure is higher the COP of unit will be lower 15 3 Fan control Control of MX7 series DC motor The air supply speed of outdoor unit can be set from speed 0 to 15 in accordance with...

Page 118: ...t exceed 3 7MPa 2 When the high pressure reaches 4 0MPa or more the failure of high pressure switch disconnection is alarmed and the unit will stop operating Protection control for low pressure 1 When...

Page 119: ...the upper limit value or below even at the lowest rotating speed 20rps the compressor will stop operating If the current reaches the exit value or below it will get back to the target rotating speed N...

Page 120: ...alue is below 11 open circuit or over 1012 short circuit for 60 seconds If Tao 0 no need to detect the open circuit failure AD value is below 11 Resumable 23 1 Discharging temp sensor Td2 failure 24 0...

Page 121: ...ailure Once confirmed un resumable 30 1 High pressure switch HPS2 failure 31 Liquid pipe pressure sensor P1 failure If AD value is below 11 open circuit or over 1012 short circuit for 60 seconds alarm...

Page 122: ...main PCB L2 connect the S of the main PCB L3 supply power for module no fixed frequency compress so don t detect phase sequence only detect if it lack of phase Once confirmed un resumable 38 High pres...

Page 123: ...sor Ps too high protection Don t protect control continue to work If it occurs 4 times in an hour locking Once confirmed un resumable 45 If it occurs 4 times in an hour No communication within 30 seco...

Page 124: ...EPROM of the master unit Reset 76 1 Slave unit quantity setting is not in conformance with data in EEPROM of the master unit 76 2 Slave unit capacity setting is not in conformance with data in EEPROM...

Page 125: ...V INV control board resumes automatically 114 1 Module 2 DC under voltage 115 0 Module 1 DC over voltage If DCBUS voltage DC642V alarm If DCBUS voltage DC642V INV control board resumes automatically 1...

Page 126: ...not be electrified and the whole system will execute 4WV reversing operation again If it occurs 4 times in one hour confirm the failure Once confirmed un resumable 128 MCU program need update The VRF...

Page 127: ...alue is below 11 open circuit or above 1012 short circuit for 60 seconds continuously the in abnormity will not be handled when the sensor operates in the cooling mode and no alarm is given during def...

Page 128: ...nditions It is detected that the AD value is below 11 open circuit or above 1012 short circuit for 60 seconds continuously and no alarm is given during defrosting and within 3 minutes at the end of de...

Page 129: ...tion conditions It is detected that the AD value is below 11 open circuit or above 1012 short circuit for 60 seconds continuously and no alarm is given during defrosting and within 3 minutes at the en...

Page 130: ...ns It is detected that the AD value is below 11 open circuit or above 1012 short circuit for 60 seconds continuously If Ta 10 C the open circuit is detected after 3 minutes of compressor operation AD...

Page 131: ...ditions It is detected that the AD value is below 11 open circuit or above 1012 short circuit for 60 seconds continuously when Ta 10 C no alarm is given when ET 10 C no alarm is given within 5 minutes...

Page 132: ...AD value is below 11 open circuit or above 1012 short circuit for 60 seconds continuously the cooling mode operates the sensor abnormity without troubleshooting it and no alarm is given during defrost...

Page 133: ...than set number for 270 seconds continuously it is detected that the number of indoor units is more than set number for 170 seconds continuously 4 Possible causes Poor communication wire short circuit...

Page 134: ...120 C 4 Possible causes The oil temperature sensor is with resistance drift The refrigerant in the system is insufficient The outdoor unit LEVb SV31 SV32 etc cannot be turned on normally The unit con...

Page 135: ...nfirmation conditions It is detected that the AD value is below 11 open circuit or above 1012 short circuit for 30 seconds continuously and no alarm is given during defrosting and within 3 minutes at...

Page 136: ...rmation conditions It is detected that the AD value is below 11 open circuit or above 1012 short circuit for 30 seconds continuously and no alarm is given during defrosting and within 3 minutes at the...

Page 137: ...quired by the PCB is incorrect The high pressure side of the unit is blocked The outdoor fan stops operating when cooling The refrigerant is excessive It is out of the operating range of units Replace...

Page 138: ...short circuit for 30 seconds continuously and no alarm is given during defrosting and within 3 minutes at the end of defrosting shielded by ordinary model 4 Possible causes The dip switch is set as a...

Page 139: ...D value is below 11 open circuit or above 1012 short circuit for 60 seconds continuously the cooling mode operates the sensor abnormity without troubleshooting it and no alarm is given during defrosti...

Page 140: ...ting Flow Logic III series Diagnosis Troubleshooting 2 Abnormity detection method Incorrect EEPROM data 3 Abnormity confirmation conditions EEPROM communication error EEPROM data check error model ID...

Page 141: ...4 Possible causes The oil temperature sensor is with resistance drift The refrigerant in the system is insufficient The outdoor unit LEVb SV31 and SV32 cannot be turned on normally The unit condensati...

Page 142: ...nt in the system is insufficient The four way valve cannot be switched normally or with backflow The filter of compressor suction pipe is blocked by foreign matters The detection value ofTsuc or Tdef1...

Page 143: ...ndoor unit and non operation of fan in operating indoor unit The system refrigerant is too much The operation environment is beyond the allowed range Check if the resistance of oil temperature sensor...

Page 144: ...20 times Outdoor unit LED status LED1 LED2 Normal Normal 1 Model Diagnosis and troubleshooting Flow Logic III series Diagnosis Troubleshooting 2 Abnormity detection method S phase loss error 3 Abnorm...

Page 145: ...m is insufficient or the system is with air leakage The pipelines on the low pressure side or liquid side of the unit are blocked The outdoor unit cannot be turned on normally due to failure to open e...

Page 146: ...ure sensor is incorrect The refrigerant in the system is insufficient or the system is with air leakage The pipelines on the high pressure side or liquid side of the unit are blocked The outdoor unit...

Page 147: ...rmally The inverter compressor is with serious inter deterioration which makes it difficult to form difference between high and low pressure The operation environment is beyond the allowed range C h e...

Page 148: ...d The outdoor fan stops operating when cooling The refrigerant is excessive It is out of the operating range of units Check if the voltage characteristic of the corresponding pressure sensor is normal...

Page 149: ...and non operation of fan in operating indoor unit The system is filled with excessive refrigerant The operation environment is beyond the allowed range Check if the resistance of discharging temperat...

Page 150: ...bnormity confirmation conditions No communication for 30s E 4 Possible causes Poor communication wire short circuit or disconnection Non corresponding communication wire A B and C Incorrect connection...

Page 151: ...nnected 3 Abnormity confirmation conditions No communication for 30s 4 Possible causes Poor communication wire disconnection Incorrect correspondence of INV1 and INV2 incorrect connection of outdoor u...

Page 152: ...of target value operate for 2min shut down 2min and automatically recover after 50s 4 Possible causes Insufficient power supply which causes motor with lower or higher voltage input The rotating speed...

Page 153: ...confirmation conditions Alarm to shut down if the reverse signal from the fan is detected and the reverse rotation speed is above 700rpm overlook the fan clockwise operation refers to reverse rotation...

Page 154: ...g speed is set as below 400rpm for 10s make failure confirmation five times per hour 4 Possible causes Excessive supply voltage Larger static pressure of fan Y Check if the wire harness of fan is conn...

Page 155: ...ith serious inter deterioration which makes it difficult to form difference between high and low pressure The operation environment is beyond the allowed range Check if the high low pressure differenc...

Page 156: ...nges 76 2 3 Abnormity confirmation conditions Quantity of sub unit setting does not conform to host EEPROM data address of sub unit setting does not conform to host EEPROM data power input setting of...

Page 157: ...alance electromagnetic valves are switched off The temperature detected by Toilp sensor is incorrect The oil balance pipe is blocked The allowed operation range is exceeded and it becomes difficult to...

Page 158: ...pressure sensor is correct 3 Abnormity confirmation conditions Ps 0 1Mpa runs continually for 30 minutes upon operation of cooling compressor Ts1 ET 20 Ts1 ET 20 C LEV runs fully open for 60 minutes u...

Page 159: ...nditions After 30 minute detection on incorrect wiring for outdoor units display the failure code when Td2 Tao 30K for indoor units display the failure code when cooling Tc2 Tai 20K display the failur...

Page 160: ...LED3 and LED4 is correct 3 Abnormity confirmation conditions The HP difference between outdoor units is above 4 in one system 4 Possible causes The power input difference between outdoor units is abov...

Page 161: ...le hardware 4 Possible causes The module alarms FO failure due to poor heat dissipation The module alarms failure as it is broken down Liquid shock is found in compressor which results in overcurrent...

Page 162: ...Overcurrent of module hardware 4 Possible causes The module alarms failure as it broke down Liquid shock is found in compressor which results in overcurrent upon starting or operating The compressor w...

Page 163: ...ions Raise failure alarm when temperature 94 C INV control board recovers automatically when temperature 94 C 4 Possible causes The module is insecurely fixed which results in poor heat dissipation Th...

Page 164: ...shock Check if the capacitor junction or capacitor is in normal conditions 3 Abnormity confirmation conditions Module overload 4 Possible causes There is a problem of heating tape of compressor that t...

Page 165: ...mation conditions Raise failure alarm when power voltage DC420V INV control board recovers automatically when voltage DC420V 4 Possible causes Incorrect wiring may result in under voltage alarm PTC or...

Page 166: ...et is correctly wired 3 Abnormity confirmation conditions Raise failure alarm when power voltage DC642V INV control board recovers automatically when voltage DC642V 4 Possible causes Incorrect connect...

Page 167: ...rol board and inverter board is in normal conditions 3 Abnormity confirmation conditions Failure alarm if communication signal fails to be detected for continuous 30s and INV control board recovers im...

Page 168: ...s The current detection loop of inverter board is in poor performance which results in rapid current rise of compressor Damage or liquid shock is found in compressor which results in overcurrent UVW w...

Page 169: ...overheating protection 4 Possible causes The inverter board and module are wired insecurely which results in failure alarm due to failure to detect compressor rotation speed The compressor or the pow...

Page 170: ...rect direction The inverter board or current sensor is damaged Check if the inverter module is connected to the three phase lines U red V white and W black correspondingly on compressor Check if the c...

Page 171: ...4 Possible causes The inverter board and current sensor is anti connected or the current sensor is in incorrect direction The inverter board or current sensor is damaged Check if there is audible soun...

Page 172: ...ell Check if the current sensor is well 3 Abnormity confirmation conditions The current detection sensor of inverter control board is in abnormal conditions disconnected or connected incorrectly 4 Pos...

Page 173: ...rmal 3 Abnormity confirmation conditions The power supply of inverter control board is interrupted instantly 4 Possible causes The supply voltage is found with abnormal fluctuations The PTC or relay d...

Page 174: ...circuit of inverter board is normal Check if the resistance of temperature sensor is normal Check if they are connected correctly 3 Abnormity confirmation conditions The temperature sensor is disconne...

Page 175: ...and connected Check if the power module is well Check if the inverter board is well 3 Abnormity confirmation conditions current frequency INV target frequency 3Hz or target frequency 0 actual frequenc...

Page 176: ...Power on is not allowed in following situations the capacity is above 130 or below 50 heating when the outdoor ambient temperature is above 26 C upon system standby start cooling Ps 0 23Mpa or heating...

Page 177: ...or Ts Ts1 Ts2 Tsco 0010451307 R25 10K 3 B25 50 3700K 3 2 Indoor coil temp sensor Tdef1 Tdef2 Toci1 Toci2 Tliqsc MHW551A026 R25 10K 3 B25 50 3700K 3 3 Outdoor ambient temp sensor Tao 0010450192 R25 10K...

Page 178: ...372 889 052 959 732 7 95 7 95 15 777 574 844 042 910 51 7 88 7 88 16 739 066 801 59 864 114 7 8 7 8 17 702 705 761 533 820 361 7 73 7 73 18 668 353 723 717 779 081 7 65 7 65 19 635 885 688 001 740 117...

Page 179: ...089 163 682 172 275 5 25 5 25 51 148 748 156 866 164 984 5 18 5 18 52 142 698 150 367 158 036 5 1 5 1 53 136 924 144 168 151 412 5 03 5 03 54 131 411 138 255 145 099 4 95 4 95 55 126 148 132 613 139 0...

Page 180: ...43 246 44 659 3 27 3 27 85 40 332 41 723 43 114 3 33 3 33 86 38 891 40 26 41 629 3 4 3 4 87 37 509 38 856 40 203 3 47 3 47 88 36 181 37 506 38 831 3 53 3 53 89 34 905 36 209 37 513 3 6 3 6 90 33 68 34...

Page 181: ...141 13 911 14 681 5 53 5 53 119 12 733 13 488 14 243 5 6 5 6 120 12 339 13 08 13 821 5 67 5 67 121 11 958 12 685 13 412 5 73 5 73 122 11 591 12 305 13 019 5 8 5 8 123 11 238 11 938 12 638 5 87 5 87 1...

Page 182: ...6 13 6 13 17 75 342 71 041 66 74 6 05 6 05 16 71 471 67 437 63 403 5 98 5 98 15 67 798 64 015 60 232 5 91 5 91 14 64 316 60 769 57 222 5 84 5 84 13 61 017 57 692 54 367 5 76 5 76 12 57 895 54 778 51...

Page 183: ...17 13 349 12 881 3 51 3 51 19 13 24 12 8 12 36 3 44 3 44 20 12 69 12 277 11 864 3 36 3 36 21 12 166 11 778 11 39 3 29 3 29 22 11 666 11 302 10 938 3 22 3 22 23 11 189 10 848 10 507 3 15 3 15 24 10 734...

Page 184: ...3 468 3 309 3 15 4 81 4 81 55 3 349 3 193 3 037 4 88 4 88 56 3 233 3 081 2 929 4 94 4 94 57 3 123 2 974 2 825 5 5 58 3 015 2 87 2 725 5 06 5 06 59 2 913 2 771 2 629 5 13 5 13 60 2 815 2 676 2 537 5 1...

Page 185: ...49 1 169 1 089 6 81 6 81 87 1 214 1 136 1 058 6 88 6 88 88 1 181 1 104 1 027 6 94 6 94 89 1 148 1 073 0 998 7 7 90 1 116 1 042 0 968 7 06 7 06 91 1 085 1 013 0 941 7 13 7 13 92 1 056 0 985 0 914 7 19...

Page 186: ...00 6 30 6 59 6 85 23 52 72 55 20 57 50 76 00 6 08 6 36 6 62 24 50 35 52 67 54 82 77 00 5 86 6 14 6 39 25 48 10 50 27 52 28 78 00 5 65 5 93 6 18 26 45 97 47 99 49 87 79 00 5 45 5 72 5 97 27 43 94 45 8...

Page 187: ...Airwell reserves the right to make change without any notice...

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