mundoclima MUEX-H6 “MultiSplit System” User manual

www.mundoclima.com

CL20440 to CL20452

MULTI INVERTER SERIE H6M

English

Th

ank you very much for purchasing our products.

Please read this manual carefully before installing

and using the unit.

Service manual

ODMFI-B1-1606

CONTENTS

1. General information of Outdoor Units .......................................... 3

2. Features .......................................................................................... 4

3. Dimensions ..................................................................................... 5

4. Refrigeration Cycle Diagram ......................................................... 6

5. Wiring diagram ............................................................................... 8

6. Indoor units combination ............................................................ 11

7. Sound Levels ................................................................................ 13

8. Installation Details ........................................................................ 14

8.1 Wrench torque sheet for installation .......................................................................................... 14

8.2 Connecting the cables ............................................................................................................... 14

8.3 Pipe length and the elevation .................................................................................................... 14

8.4 Installation for the first time ........................................................................................................ 15

8.5 Adding the refrigerant after running the system for many years ............................................... 19

8.6 Re-installation while the indoor unit need to be repaired .......................................................... 20

8.7 Re-installation while the outdoor unit need to be repaired ........................................................ 22

9. Electronic control function ........................................................ 24

10. Troubleshooting ........................................................................ 29

1. General information of Outdoor Units

Model name Dimension (mm) Compressor

MUEX-14-H6.2

800x333x554

ASN108D22UEZ

MUEX-18-H6.2

800x333x554

ASM135D23UFZ

MUEX-21-H6.3

845x363x702

ASM135D23UFZ

MUEX-27-H6.3

845x363x702

ATF235D22UMT

MUEX-28-H6.4

946x410x810

ATF235D22UMT

MUEX-36-H6.4

946x410x810

ATF310D43UMT

MUEX-42-H6.5

946x410x810

ATF310D43UMT

3

2. Features

The hydrophilic fin can improve the heating efficiency at operation mode.

It protects the valves and prevents water from dripping.

4 way valve control

It is only operated in the heating operation mode except defrosting operation.

Outdoor unit

Power relay control

Hydrophilic aluminum fin

Anti-rust cabinet

Valve protection cover

Low noise air flow system

Discharge pipe temperature protection

4

3. Dimensions

A

B

D

Model

Unit: mm

W D H W1 A B

MUEX-14-H6.2 800 333 554 860 514 340

MUEX-18-H6.2 800 333 554 860 514 340

MUEX-21-H6.3 845 363 702 923 540 350

MUEX-27-H6.3 845 363 702 923 540 350

MUEX-28-H6.4 946 410 810 1034 673 403

MUEX-36-H6.4 946 410 810 1034 673 403

MUEX-42-H6.5 946 410 810 1034 673 403

5

4. Refrigeration Cycle Diagram

4.1 Refrigeration circuit drawing of inverter 1 drive 2 type

LIQU

ID

VALVE A

GAS VALVE A

HEAT

EXCHANGE

(EVAPORATOR)

HEAT

EXCHANGE

(CONDENSER)

Compressor

4-

WA

Y VALVE

COOLING

HEATING

T2

E

vaporator

temp. sensor

middle

T1 Room

temp. sensor

T3

Condenser

temp. sensor

T5 Discharge

temp. sensor

T4 Ambient

temp. sensor

INDOOR OUTDOOR

EXV

A

CAPILIAR

Y A

CHECK V

A

LVE

CAPILIARY TUBE

EXV

B

CAPILIAR

Y B

LIQU

ID

VALVE B

GAS VALVE B

Accumulator

T2B-

A

Evaporator

temp. sensor outlet

T2B-B

4.2 Refrigeration circuit drawing of inverter 1 drive 3 type

LIQU

ID

VALVE A

GAS VALVE A

HEAT

EXCHANGE

(EVAPORATOR)

HEAT

EXCHANGE

(CONDENSER)

Compressor

4-WA

Y

VALVE

COOLING

HEATING

T2

E

vaporator

temp. sensor

middle

T1 Room

temp. sensor

T3

Condenser

temp. sensor

T5 Discharge

temp. sensor

T4 Ambient

temp. sensor

INDOOR OUTDOOR

EX

V

A

CAPILIARY A

CH

EC

K VALVE

CAPILIARY TUBE

EX

V

B

CAPILIARY B

LIQU

ID

VALVE B

GAS VALVE B

EX

V

C

CAPILIARY C

LIQUID VALVE C

GA

S

VALVE C

Accumulator

T2

B-

A Evaporator

temp. sensor outlet

T2B-B

T2B-C

6

4.3 Refrigeration circuit drawing of inverter 1 drive 4 type

LIQUID V

A

LVE A

GAS VALVE A

HEAT

EXCHANGE

(EVAPORATOR)

HEAT

EXCHANGE

(CONDENSER)

Compressor

4-

W

AY VALVE

COOLING

HEATING

T

2

Evaporator

temp. sensor

middle

T1 Room

temp. sensor

T3

Condense

r

temp

. sensor

T5 Discharge

temp. sensor

T4 Ambient

temp. sensor

INDOOR OUTDOOR

EXV A

CA

PIL

IARY A

CH

EC

K VALVE

CAPILIARY TUBE

EXV B

CA

PIL

IARY B

LIQUID V

A

LVE B

GAS VALVE B

EXV

C

CA

PILIARY C

LIQUID VALVE C

GAS

V

ALVE C

EXV

D

CA

PILIARY D

LIQUID VALVE D

GAS

V

ALVE D

Ac

c

umulator

Hi

gh

pressure

switch

Lo

w pressu

re

switch

T2B-A Evaporator

temp. sensor outlet

T2B-B

T2B-C

T2B-D

4.4 Refrigeration circuit drawing of inverter 1 drive 5 type

LIQ

UI

D VALVE A

GAS VALVE A

HEAT

EXCHANGE

(EVAPORATOR)

HEAT

EXCHANGE

(CONDENSER)

CO

OLI

NG

HEATING

T2 Evaporator

temp. sensor

middle

T1 Room

temp. sensor

T3

Conden

se

r

temp. sensor

T4 Ambient

temp. sensor

INDOOR OUTDOOR

EXV

A

CA

PILIARY A

CH

EC

K VALVE

CAPILIARY TUBE

EXV

B

CA

PILIARY B

LIQ

UI

D VALVE B

GAS VALVE B

EXV

C

CA

PILIARY C

LIQUID VALVE C

GA

S VALVE

C

EXV

D

CA

PILIARY D

LIQUID VALVE D

GA

S VALVE D

EXV

E

CA

PILIARY E

LIQUID VALVE E

GA

S

VALVE E

Com

pres

sor

4-

W

AY VALVE

T5

Disch

arge

temp. sensor

Acc

um

ulator

Hig

h pre

ssure

switch

Lo

w pre

ssure

switch

T2B-A Evaporator

temp. sensor outlet

T2B-B

T2B-C

T2B-D

T2B-E

7

5. Wiring diagram

MUEX-14-H6.2 / MUEX-18-H6.2

MUEX-21-H6.3 / MUEX-27-H6.3

4-WAY

DC-F

AN

CN 7

3

ELECTRONIC

EXPANSION

VALVE

5/6

CN 31

P

AN

HEATER

CN 15

OPTIONAL

CN 60

CRANKCASE

HEA

TER

CN 17

OPTIONAL

BLUE

BROWN

BLACK

L

S

N

AMBIENT TEMP

. SENSOR

DISCHARGE TEMP

. SENSOR

CN 21

CONDENSER TEMP. SENSOR

Y/G

CN 1A

Y/G

COMPRESSOR

Y/G

CN 50

3

U

V

W

BLUE

RED

BLACK

S(B)

N(A)

N(B)

L(B)

L

L(A)

N

S(A)

5/6

CN 4

CN 2

CN 7

CN 3

ELECTRONIC

EXPANSIVE

VALVE

TESTPORT

CN 1-3

CN 1-1

CN 1-2

INDOOR PIPE

OUT TEMP

VALVE-B

VALVE-A

B

A

POWER

SUPPL

Y

T

O B

T

O A

S(2)

S(1)

NOTE:

S(1);S(2)

NO USED

16022300001333

OPTIONAL

COMPRESSOR

CN1

U(R)

V(S)

W(C)

ELECTRONIC

EXPANSIVE

VALVE

BLUE

BLACK

U

V

W

CN7

VALVE-A

INDOOR PIPE

OUT TEMP

MAIN BOARD

CN19

CN17

T4

T3

P-1

RED

DISCHARGE SENSOR

CN18

VALVE-B

COM(3)

RY2

ON(4)

CN29

CN21

CN15

T2B

A

B

CN14

LOW/HIGH

CN12

CompTop

YELLOW

RED

LOW PRESSURE PROTECT

HIGH PRESSURE PROTECT

4

CN4

CN5

~

IPM BOARD

5

RED(BROWN)

BLUE

Y/G

L-OUT

Y/G

CN6

CN5

HEATER1

HEAT1

CN1

CN2

4-WAY

HEATER2

OPTIONAL

CN9

CN8

HEAT2

CN2

CN3

REACTOR

BLUE

OUTDOOR AMBIENT

TEMPERATURE SENSOR

CONDENSER

TEMPERATURE SENSOR

P2

P1

REACT0R2 R05094A

OPTIONAL

WHITE

Y/G

N

OTE:Use the magnetic ring

(not supplied, optional part)

to hitch the connective cable

of indoor and outdoor units

after installation. one magnetic

ring is used for one cable.

DC FAN

6

CN14

3

ELECTRONIC

EXPANSIVE

VALVE

3

6

P-2

CN22

VALVE-C

ELECTRONIC

EXPANSIVE

VALVE

6

C

L-IN

N-IN

CN25

CN23

S-A

S-B

CN3

CN4

BLACK

BLUE

BROWN

BLACK

RED

S-C

CN20

L

N

POWER

TO A

SUPPLY

Y/G

BROWN

BLUE

BLACK

Y/G

TO B

TO C

Y/G

L(A)

S(A)

N(A)

L(A)

S(A)

N(A)

L(B)

S(B)

N(B)

L(C)

N(C)

S(C)

Y/G

16022300000913

8

MUEX

-

28

-

H6.4

MUEX-36-H6.4

COMPRESSOR

CN1

U(R)

V(S)

W(C)

ELECTRONIC

EXPANSIVE

VALVE

BLUE

BLACK

U

V

W

CN7

VALVE-A

INDOOR PIPE

OUT TEMP

MAIN BOARD

CN19

CN17

T4

T3

P-1

RED

DISCHARGE SENSOR

CN18

VALVE-B

COM(3)

RY2

ON(4)

CN29

CN21

CN15

T2B

A

B

CN14

LOW/HIGH

CN12

CompTop

YELLOW

RED

LOW PRESSURE PROTECT

HIGH PRESSURE PROTECT

4

CN4

CN5

~

IPM BOARD

5

RED(BROWN)

BLUE

Y/G

D

CN24

VALVE-D

L-OUT

Y/G

CN6

CN5

HEATER1

HEAT1

CN1

CN2

4-WAY

HEATER2

OPTIONAL

CN9

CN8

HEAT2

CN2

CN3

REACTOR

BLUE

OUTDOOR AMBIENT

TEMPERATURE SENSOR

CONDENSER

TEMPERATURE SENSOR

P2

P1

REACT0R2 R05094A

OPTIONAL

WHITE

Y/G

N

OTE:Use the magnetic ring

(not supplied, optional part)

to hitch the connective cable

of indoor and outdoor units

after installation. one magnetic

ring is used for one cable.

DC FAN

6

CN14

3

ELECTRONIC

EXPANSIVE

VALVE

ELECTRONIC

EXPANSIVE

VALVE

3

6

P-2

L-IN

N-IN

CN25

CN23

S-A

S-B

CN3

CN4

BLACK

BLUE

BROWN

BLACK

RED

S-C

CN20

L

N

POWER

TO A

SUPPLY

Y/G

BROWN

BLUE

BLACK

Y/G

TO B

TO C

Y/G

L(A)

S(A)

N(A)

L(A)

S(A)

N(A)

L(B)

S(B)

N(B)

L(C)

N(C)

S(C)

S-D

CN16

L(D)

N(D)

S(D)

BROWN

BLUE

BLACK

TO D

Y/G

CN22

VALVE-C

ELECTRONIC

EXPANSIVE

VALVE

6

C

16022300000803

COMP

FM1

MAIN BOARD

RED

BLACK

U

V

W

Y/G

L

L-PRO

T3

T4

H-PRO

Y/G

TP

V

U

C

N19

C

N51

C

N55

W

EEV

BLACK

DRIVER BOARD

RED

7

Y

ELLOW

BLUE

P-1

C

N53

C

N3

C

N4

C

N10

C

N40

CN22

C

N44

C

N8

C

N9

CN7

CN2

C

N1

C

N5

C

N54

C

N52

3

C

N33

C

N6

SV

4-W

AY1

BLUE

HEA

T_D

HEAT_Y

OPTIONAL

3

BLACK

RED

BLUE

Y

ELLOW

RED

BLACK

RED

BLACK

C

N20

M

5

(6)

A

C

N21

M

5

(6)

B

C

N17

M

5

(6)

C

N19

M

5

(6)

E

C

N18

M

5

(6)

D

C

N30

C

N29

C

N28

C

N27

T2B-A B C D E

CN13

INDOOR

PIPE OUT

TEMP A B C D E

L(B)

N(B) S(B) L(C) N(C) S(C) L(D) N(D) S(D)

BROWN

BLUE

BLACK

CODE

PART NAME

COMPRESSOR

HEAT

4-W

AY VALVE

COMP

CAP1

EEV

ELECTRIC EXP

ANSIVE

VALVE

OUTDOOR AC FAN

FAN1

H-PRO

L-PRO

LOW PRESSURE SWITCH

HIGH PRESSURE SWITCH

T3

T4

CONDENSER

TEMPERA

TURE SENSOR

OUTDOOR

AMBIENT

TEMPERATURE SENSOR

CRANKCASE HEA

TING

SV

L

PFC INDUCT

OR

TH

HEA

TSINK

TEMPERATURE SENSOR

TP

EXHAUST

TEMPERA

TURE SENSOR

FM1

OUTDOOR DC F

AN

FAN MOTOR CAPACITOR

P

ART NAMECODE

BLUE

RDE

BLACK

RDE

BROWN

BLUE

BLACK

BROWN

BLUE

BLACK

DR BOARD

CN1

CN5

CN2

4

RJ45

FOR USER

TO CONNECT

C

N16

OPTIONAL

POWER

L

N

SUPPLY

L(A)

N(A) S(A)

Y/G

TO B

Y/G

TO A

Y/G

TO C

Y/G

TO D

OPTIONAL

9

MUEX-42-H6.5

COMP

FM1

MAIN BOARD

RED

BLACK

U

V

W

Y/G

L

L-PRO

T3

T4

H-PRO

Y/G

TP

V

U

C

N19

C

N51

C

N55

W

EEV

BLACK

DRIVER BOARD

RED

7

Y

ELLOW

BLUE

P-1

C

N53

C

N3

CN4

C

N10

C

N40

CN22

CN44

C

N8

C

N9

CN7

CN2

C

N1

C

N5

C

N54

C

N52

3

C

N33

C

N6

SV

4-W

AY1

BLUE

HEA

T_D

HEAT_Y

OPTIONAL

3

BLACK

RED

BLUE

Y

ELLOW

RED

BLACK

RED

BLACK

CN20

M

5

(6)

A

CN21

M

5

(6)

B

C

N17

M

5

(6)

C

N19

M

5

(6)

E

C

N18

M

5(6)

D

C

N29

C

N28

C

N27

C

N26

T2B-A B C D E

CN13

INDOOR

PIPE OUT

TEMP A B C D E

L(C)

N(C) S(C) L(D) N(D) S(D) L(E) N(E) S(E)

BROWN

BLUE

BLACK

CODE

PART NAME

COMPRESSOR

HEAT

4-W

AY VALVE

COMP

CAP1

EEV

ELECTRIC EXP

ANSIVE

VALVE

OUTDOOR AC FAN

FAN1

H-PRO

L-PRO

LOW PRESSURE SWITCH

HIGH PRESSURE SWITCH

T3

T4

CONDENSER

TEMPERA

TURE SENSOR

OUTDOOR

AMBIENT

TEMPERATURE SENSOR

CRANKCASE HEA

TING

SV

L

PFC INDUCT

OR

TH

HEA

TSINK

TEMPERATURE SENSOR

TP

EXHAUST

TEMPERA

TURE SENSOR

FM1

OUTDOOR DC F

AN

FAN MOTOR CAPACITOR

P

ART NAMECODE

BLUE

RDE

BLACK

RDE

C

N30

POWER

L

N

L(B)

N(B)

S(B)

L(A)

N(A)

S(A)

BROWN

BLUE

BLACK

BROWN

BLUE

BLACK

BROWN

BLUE

BLACK

DR BOARD

CN1

CN5

CN2

4

RJ45

FOR USER

TO CONNECT

C

N16

OPTIONAL

Y/G

TO B

Y/G

TO C

Y/G

TO E

Y/G

TO A

Y/G

TO D

OPTIONAL

10

6. Indoor units combination

6.1 Indoor unit combination for MUEX-14-H6.2

One unit Two unit

7 7+7 9+9

9 7+9 9+12

12 7+12

18

6.2 Indoor unit combination for MUEX-18-H6.2

One unit Two unit

7 7+7 9+9

9 7+9 9+12

12 7+12 9+18

18 7+18 12+12

6.3 Indoor unit combination for MUEX-21-H6.3

One unit Two unit Three unit

7 7+7 9+9 7+7+7 7+9+12

9 7+9 9+12 7+7+9 9+9+9

12 7+12 9+18 7+7+12 9+9+12

18 7+18 12+12 7+9+9 7+12+12

6.4 Indoor unit combination for MUEX-27-H6.3

One unit Two unit Three unit

7 7+7 9+9 12+18 7+7+7 7+9+9 7+12+18 9+12+12

9 7+9 9+12 18+18 7+7+9 7+9+12 9+9+9 9+12+18

12 7+12 9+18 7+7+12 7+9+18 9+9+12 12+12+12

18 7+18 12+12 7+7+18 7+12+12 9+9+18

6.5 Indoor unit combination for MUEX-28-H6.4

One unit Two unit Three unit Four unit

7 7+7 9+9 12+18 7+7+7 7+9+9 7+12+18 9+12+18 7+7+7+7 7+7+9+9 7+9+9+12

9 7+9 9+12 12+24 7+7+9 7+9+12 9+9+9 12+12+12 7+7+7+9 7+7+9+12 7+9+12+12

12 7+12 9+18 18+18 7+7+12 7+9+18 9+9+12 12+12+18 7+7+7+12 7+7+9+18 9+9+9+9

18 7+18 12+12 7+7+18 7+9+24 9+9+18 7+7+7+18 7+7+12+12 9+9+9+12

24 7+24 9+24 7+7+24 7+12+12 9+12+12 7+9+9+9

11

6.6 Indoor unit combination for MUEX-36-H6.4

6.7 Indoor unit combination for MUEX-42-H6.5

One Unit Two Unit Three Unit

7 7+7 9+18 7+7+7 7+9+18 9+9+12 12+12+12

9 7+9 9+24 7+7+9 7+9+24 9+9+18 12+12+18

12 7+12 12+12 7+7+12 7+12+12 9+9+24 12+12+24

18 7+18 12+18 7+7+18 7+12+18 9+12+12 12+18+18

24 7+24 12+24 7+7+24 7+12+24 9+12+18

9+9 18+18 7+9+9 7+18+18 9+12+24

9+12 7+9+12 9+9+9 9+18+18

Four Unit

7+7+7+7 7+7+9+18 7+9+9+12 7+12+12+12 9+9+12+12

7+7+7+9 7+7+9+24 7+9+9+18 7+12+12+18 9+9+12+18

7+7+7+12 7+7+12+12 7+9+9+24 7+12+12+24 9+9+12+24

7+7+7+18 7+7+12+18 7+9+12+12 9+9+9+9 9+12+12+12

7+7+7+24 7+7+12+24 7+9+12+18 9+9+9+12 9+12+12+18

7+7+9+9 7+7+18+18 7+9+12+24 9+9+9+18 12+12+12+12

7+7+9+12 7+9+9+9 7+9+18+18 9+9+9+24 12+12+12+18

Five Unit

7+7+7+7+7 7+7+7+9+18 7+7+9+9+24 7+9+9+12+12 9+9+9+12+12

7+7+7+7+9 7+7+7+9+24 7+7+9+12+18 7+9+9+12+18 9+9+9+12+18

7+7+7+7+12 7+7+7+12+18 7+7+12+12+12 7+9+12+12+12 9+9+12+12+12

7+7+7+7+18 7+7+7+18+18 7+7+12+12+18 7+9+12+12+18 9+12+12+12+12

7+7+7+7+24 7+7+9+9+9 7+9+9+9+9 9+9+9+9+9 9+12+12+12+18

7+7+7+9+9 7+7+9+9+12 7+9+9+9+12 9+9+9+9+12 12+12+12+12+12

7+7+7+9+12 7+7+9+9+18 7+9+9+9+18 9+9+9+9+18

One unit

Two unit Three unit Four unit

7 7+7 9+18 7+7+7 7+9+18 9+9+12 12+12+12 7+7+7+7 7+7+9+24 7+9+12+12 9+9+12+12

9 7+9 9+24 7+7+9 7+9+24 9+9+18 12+12+18 7+7+7+9 7+7+12+12 7+9+12+18 9+9+12+18

12 7+12 12+12 7+7+12 7+12+12 9+9+24 12+12+24 7+7+7+12 7+7+12+18 7+9+18+18 9+12+12+12

18 7+18 12+18 7+7+18 7+12+18 9+12+12 12+18+18 7+7+7+18 7+7+18+18 7+12+12+12 9+12+12+18

24 7+24 12+24 7+7+24 7+12+24 9+12+18 7+7+7+24 7+9+9+9 7+12+12+18 12+12+12+12

9+9 18+18 7+9+9 7+18+18 9+12+24 7+7+9+9 7+9+9+12 9+9+9+9 12+12+12+18

9+12 7+9+12 9+9+9 9+18+18 7+7+9+12 7+9+9+18 9+9+9+12

7+7+9+18 7+9+9+24 9+9+9+18

12

7. Sound Levels

H

1.0m

Outdoor Unit

Micr

ophone

Note: H= 0.5 × height of outdoor unit

Model Noise Power dB(A) Noise level dB(A)

MUEX-14-H6.2

MUEX-18-H6.2 65 56.5

MUEX-21-H6.3 65 57.5

MUEX-27-H6.3 68 59.5

MUEX-28-H6.4 66 60

MUEX-36-H6.4 68 63.5

MUEX-42-H6.5 68 62

13

8. Installation Details

8.1 Wrench torque sheet for installation

Outside diameter Torque Additional tightening torque

mm N.cm N.cm

Ф6.35 1500(153kgf.cm) 1600(163kgf.cm)

Ф9.52 2500(255kgf.cm) 2600(265kgf.cm)

Ф12.7 3500(357kgf.cm) 3600(367kgf.cm)

8.2 Connecting the cables

The power cord of connect should be selected according to the following specifications sheet.

Rated current of appliance Nominal cross-sectional area (mm²)

>3 and ≤6 0.75

>6 and ≤10 1

>10 and ≤16 1.5

>16 and ≤25 2.5

The cable size and the current of the fuse or switch are determined by the maximum current indicated on the

nameplate which located on the side panel of the unit. Please refer to the nameplate before selecting the

cable, fuse and switch.

8.3 Pipe length and the elevation

Maximum piping length and height difference

14

1 drive 2

1 drive 3

1 drive 4

1 drive 5

Max. length for all rooms (m)

30

45

60

75

Max. length for one IU (m)

25

30

35

Max. height difference between IU and OU (m)

15

Max. height difference between IUs (m)

10

Additional refrigerant charge

1 drive 2

1 drive 3

1 drive 4

1 drive 5

Chargeless pipe

length (m)

15

22.5

30

37.5

Additional

refrigerant charge

(g)

15 x (length for all

rooms - 15)

15 x (length for all

rooms – 22.5)

15 x (length for all

rooms - 30)

15 x (length for all

rooms – 37.5)

● Refrigerant pipe diameter is different according to indoor unit to be connected. When using the

extension pipe, refer to the tables below.

● When refrigerant pipe diameter is different from that of outdoor unit union (for 18K indoor unit), additional

transfer connector needs to be used on outdoor unit union.

Indoor unit

Extension pipe diameter (mm/inch)

Model Pipe diameter (mm/inch)

7K9K12K

Liquid 6.35(1/4) Liquid 6.35(1/4)

Gas 9.52(3/8) Gas 9.52(3/8)

18K

Liquid 6.35(1/4) Liquid 6.35(1/4)

Gas 12.7(1/2) Gas 12.7(1/2)

24K Liquid 9.52(3/8) Liquid 9.52(3/8)

Gas 15.9(5/8) Gas 15.9(5/8)

Outdoor unit union diameter (mm/inch)

Indoor unit A/B/C/D/E

Liquid 6.35(1/4)

Gas

9.52(3/8)

12.7(1/2)

8.4 Installation for the first time

Air and moisture in the refrigerant system have undesirable effects as below:

● Pressure in the system rises.

● Operating current rises.

● Cooling or heating efficiency drops.

● Moisture in the refrigerant circuit may freeze and block capillary tubing.

● Water may lead to corrosion of parts in the refrigerant system.

Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested and

evacuated to remove gas and moisture from the system.

Gas leak check (Soap water method):

Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit

connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles come out,

the pipes have leakage.

1. Air purging with vacuum pump

15

Caution:

1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and 3-way

valves are set to the closed position.

2) Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port..

3) Connect the charge hose of handle hi connection to the vacuum pump.

4) Fully open the handle Lo of the manifold valve.

5) Operate the vacuum pump to evacuate.

6) Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If

the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If the

pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage points.

Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm

that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

7) Turn the flare nut of the 3-way valves about 45° counterclockwise for 6 or 7seconds after the gas

coming out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a

little higher than the atmosphere pressure. Then remove the charge hose from the 3 way valve.

8) Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve.

(Indoor unit)

(Liquid side)

(Gas side)

Vacuum

pump

Vacuum

pump

Lo Hi

Handle Hi

Two-way valve

Close

Manifold valve

Compound meter

Pressure

gauge

-0.1MPa

Handle Lo

Charge hose

(Outdoor unit)

Close

Three-way valve

16

2. Air purging by refrigerant

Procedure:

1). Confirm that both the 2-way and 3-way valves are set to the closed position.

2). Connect the charge set and a charging cylinder to the service port of the 3-way valve.

3). Air purging.

Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the

2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.

After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.

4). Check the gas leakage.

Check the flare connections for gas leakage.

5). Discharge the refrigerant.

Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the

2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 Mpa.

6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open

position.

Be sure to use a hexagonal wrench to operate the valve stems.

7). Mount the valve stems nuts and the service port cap.

Be sure to use a torque wrench to tighten the service port cap to a torque 18N·m.

Be sure to check the gas leakage.

17

3. Adding the refrigerant if the pipe length >5m

Procedure:

1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve.

Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the

cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure the liquid charge.

2). Purge the air from the charge hose.

Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be

careful of the liquid refrigerant).

3) Put the charging cylinder onto the electronic scale and record the weight.

4) Operate the air conditioner at the cooling mode.

5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.

6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose from

the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose.

7). Mount the valve stem caps and the service port

Use torque wrench to tighten the service port cap to a torque of 18N.m.

Be sure to check for gas leakage.

Electronic scale

18

8.5 Adding the refrigerant after running the system for many years

Procedure:

1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve.

Connect the charge hose to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the

cylinder bottom up to ensure liquid charge.

2). Purge the air from the charge hose.

Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be

careful of the liquid refrigerant).

3) Put the charging cylinder onto the electronic scale and record the weight.

4) Operate the air conditioner at the cooling mode.

5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.

6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low side),

disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner

before disconnecting the hose.

7). Mount the valve stem caps and the service port

Use torque wrench to tighten the service port cap to a torque of 18N.m.

Be sure to check for gas leakage.

Electronic scale

19

8.6 Re-installation while the indoor unit need to be repaired

1. Collecting the refrigerant into the outdoor unit

Procedure

1). Confirm that both the 2-way and 3-way valves are set to the opened position

Remove the valve stem caps and confirm that the valve stems are in the opened position.

Be sure to use a hexagonal wrench to operate the valve stems.

2). Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port.

3). Air purging of the charge hose.

Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and

then close it quickly.

4). Set the 2-way valve to the close position.

5). Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.

6). Set the 3-way valve to the closed position immediately

Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.

Disconnect the charge set, and tighten the 2-way and 3-way valve’s stem nuts.

Use a torque wrench to tighten the 3-way valves service port cap to a torque of 1.8 kgf.m.

Be sure to check for gas leakage.

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mundoclima MUEX-H6 “MultiSplit System” User manual

mundoclima MUEX-H6 “MultiSplit System” User manual

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