Midea M2OC-18HFN1-M Bedienungsanleitung

Multi outdoor units

SERVICE MANUAL

Multi zone

CONDENSING UNITS

Revision B: ODMI-C1-1403

Model Numbers:

M2OC-18HFN1-M M3OC-30HRFN1-M

M2OD-18HFN1-M M4OC-36HRFN1-M

M3OD-27HRDN1-M

WARNING

Installation MUST conform with local building codes or, in the absence of local

codes, with the National Electrical Code NFPA70/ANSI C1-1993 or current edition

and Canadian Electrical Code Part1 CSA C.22.1.

The information contained in the manual is intended for use by a qualified service

technician familiar with safety procedures and equipped with the proper tools and

test instruments

Installation or repairs made by unqualified persons can result in hazards to you

and others.

Failure to carefully read and follow all instructions in this manual can result in

equipment malfunction, property damage, personal injury and/or death.

Table of Contents

1. Product Specifications

2. Indoor Unit Combination

3. Suggested Indoor Unit Model Numbers

4. Dimension Of Outdoor Unit

5. Refrigerant Cycle Diagram

6. Installation Details

7. Electronic Function

8. Wiring Diagrams And Electrical Trouble Shooting

9. Disassembly Instructions

10. Exploded View

CONTENTS

1. Indoor Unit Combination .......................................................................................................................................... 4

2. Suggested Indoor Unit Model Numbers ................................................................................................................... 6

3. Dimension Of Outdoor Unit...................................................................................................................................... 7

4. Refrigerant Cycle Diagram ........................................................................................................................................ 8

5. Installation Details .................................................................................................................................................... 9

6.1 Wrench torque sheet for installation ................................................................................................................. 9

6.2 Connecting the cables ........................................................................................................................................ 9

6.3 Pipe length and the elevation............................................................................................................................. 9

6.4 Installation for the first time .............................................................................................................................. 9

6.5 Adding the refrigerant after running the system for many years .................................................................... 11

6.6 Re-installation while the indoor unit need to be repaired...............................................................................11

6.7 Re-installation while the outdoor unit need to be repaired ............................................................................12

6. Electronic Function ................................................................................................................................................. 13

7.1 Abbreviation ..................................................................................................................................................... 13

7.2 Electric control working environment.............................................................................................................. 13

7.3 Main Protection................................................................................................................................................ 13

7.4 Control and Functions ......................................................................................................................................15

7. Wiring Diagrams......................................................................................................................................................19

8. Troubleshooting......................................................................................................................................................32

9.1Safety................................................................................................................................................................. 32

8.2 Indoor Unit Error Display............................................................................................................................. 33

9.3 Outdoor Unit Display ........................................................................................................................................36

9.4 Diagnosis and Solution ..................................................................................................................................... 40

9.5 Trouble Criterion Of Main Parts. ......................................................................................................................89

9. Disassembly Instructions ......................................................................................................................................100

Model: M2OC-18HFN1-M, M2OD-18HFN1-M (W210 metal plate)..................................................100

Model: M3OD-27HRDN1-M (W210 metal plate).................................................................................106

Model: M3OC-30HRFN1-M (W310 metal plate)..................................................................................113

Model: M4OC-36HRFN1-M (W520 metal plate)..................................................................................121

1. Indoor Unit Combination

Multi DC

Outdoor Unit

Nominal

capacity

Suggested

Combination

Limit

1drive 2(M2OC)

5.2kW

None

7+9

7+12

9+9

9+12

Multi DC

Outdoor Unit

Nominal

capacity

Suggested

Combination

Limit

1drive 2(M2OD)

5.2kW

None

7+9

7+12

9+9

9+12

12+12

Multi DC

Outdoor Unit

Nominal

capacity

Suggested

Combination

Limit

1 drive 3(27K)

7.5kW

The 18k indoor

unit should not

be Floor Ceiling

or Duct unit;

There should be

only one Floor

Ceiling, Oasis or

Duct unit;

7+7

7+9

7+12

7+18

9+9

9+12

9+18

12+12

12+18

7+7+7

7+7+9

7+7+12

7+7+18

7+9+9

7+9+12

7+9+18

7+12+12

9+9+9

9+9+12

9+12+12

Multi DC

Outdoor Unit

Nominal

capacity

Suggested

Combination

Limit

1 drive 3(30K)

8.0kW

There should be

only one Floor

Ceiling or Duct

unit;

7+7

7+9

7+12

7+18

9+9

9+12

9+18

12+12

12+18

18+18

7+7+7

7+7+9

7+7+12

7+7+18

7+9+9

7+9+12

7+9+18

7+12+12

7+12+18

9+9+9

9+9+12

9+9+18

9+12+12

9+12+18

12+12+12

Multi DC

Outdoor Unit

Nominal

capacity

Suggested

Combination

Limit

1 drive 4(36K)

10.5kW

None

7+7

7+9

7+12

7+18

9+9

9+12

9+18

12+12

12+18

18+18

7+7+7

7+7+9

7+7+12

7+7+18

7+9+9

7+9+12

7+9+18

7+12+12

7+12+18

9+9+9

9+9+12

9+9+18

9+12+12

9+12+18

9+18+18

12+12+12

12+12+18

12+18+18

7+7+7+7

7+7+7+9

7+7+7+12

7+7+7+18

7+7+9+9

7+7+9+12

7+7+9+18

7+9+9+9

7+9+9+12

7+9+9+18

7+9+12+12

7+9+12+18

7+12+12+12

7+12+12+18

9+9+9+9

9+9+9+12

9+9+9+18

9+9+12+12

9+9+12+18

9+12+12+12

9+12+12+18

12+12+12+12

3. Suggested Indoor Unit Model

Numbers

SUGGESTED INDOOR

M2OC-18HFN1-M

MS9AI-07HRDN1-M

MS9AI-09HRDN1-M(A)

MSV1I-09HRDN1-M

12K

MSV1I-12HRDN1-M

MS9AI-12HRDN1-M

MTBI-12HWDN1-M

MTBU-12HRDN1-M

MFAI-12HRDN1-M

MFAU-12HRFN1-M

MCA2I-12HRDN1-M

MCA2U-12HRFN1-M

MUBI-12HRDN1-M

MUBU-12HRFN1-M

SUGGESTED INDOOR

M2OD-18HFN1-M

MS9AI-07HRDN1-M

MS9AI-09HRDN1-M(A)

MSV1I-09HRDN1-M

MS11M-09HRFN1-MX4W

12K

MSV1I-12HRDN1-M

MS9AI-12HRDN1-M

MS11M-12HRFN1-MV0W

MTBI-12HWDN1-M

MTBU-12HRDN1-M

MFAI-12HRDN1-M

MFAU-12HRFN1-M

MCA2I-12HRDN1-M

MCA2U-12HRFN1-M

MUBI-12HRDN1-M

MUBU-12HRFN1-M

MS11M-12HRFN1-MW0W

MS11M-12HRFN1-MV0W

SUGGESTED INDOOR

M3OD-27HRDN1-M

MS9AI-07HRDN1-M

MS9AI-09HRDN1-M(A)

MSV1I-09HRDN1-M

12K

MSV1I-12HRDN1-M

MS9AI-12HRDN1-M

MTBI-12HWDN1-M

MTBU-12HRDN1-M

MFAI-12HRDN1-M

MFAU-12HRFN1-M

MCA2I-12HRDN1-M

MCA2U-12HRFN1-M

MUBI-12HRDN1-M

MUBU-12HRFN1-M

18K

MSV1I-18HRDN1-M

MS9AI-18HRDN1-M

MCA2I-18HRDN1-M

MCA2U-18HRFN1-M

SUGGESTED INDOOR

M3OC-30HRFN1-M

MS9AI-07HRDN1-M

MS9AI-09HRDN1-M(A)

MSV1I-09HRDN1-M

MS11M-09HRFN1-MX4W

MS11M-09HRFN1-MW0W

12K

MSV1I-12HRDN1-M

MS9AI-12HRDN1-M

MS11M-12HRFN1-MV0W

MS11M-12HRFN1-MW0W

MTBI-12HWDN1-M

MTBU-12HRDN1-M

MFAI-12HRDN1-M

MFAU-12HRFN1-M

MCA2I-12HRDN1-M

MCA2U-12HRFN1-M

MUBI-12HRDN1-M

MUBU-12HRFN1-M

18K

MSV1I-18HRDN1-M

MS9AI-18HRDN1-M

MS11M-18HRFN1-MU0W

MTBI-18HWDN1-M

MTBU-18HRDN1-M

MCA2I-18HRDN1-M

MCA2U-18HRFN1-M

MUBI-18HRDN1-M

MUBU-18HRFN1-M

SUGGESTED INDOOR

M4OC-36HRFN1-M

MS9AI-07HRDN1-M

MS9AI-09HRDN1-M(A)

MSV1I-09HRDN1-M

MS11M-09HRFN1-MX4W

MS11M-09HRFN1-MW0W

12K

MSV1I-12HRDN1-M

MS9AI-12HRDN1-M

MS11M-12HRFN1-MV0W

MS11M-12HRFN1-MW0W

MTBI-12HWDN1-M

MTBU-12HRDN1-M

MFAI-12HRDN1-M

MFAU-12HRFN1-M

MCA2I-12HRDN1-M

MCA2U-12HRFN1-M

MUBI-12HRDN1-M

MUBU-12HRFN1-M

18K

MSV1I-18HRDN1-M

MS9AI-18HRDN1-M

MS11M-18HRFN1-MU0W

MTBI-18HWDN1-M

MTBU-18HRDN1-M

MCA2I-18HRDN1-M

MCA2U-18HRFN1-M

MUBI-18HRDN1-M

MUBU-18HRFN1-M

4. Dimension Of Outdoor Unit

Model

Dimension (mm(in.))

M2OC-18HFN1-M

845(33.3)

320(12.6)

700(27.6)

908(35.7)

560(22)

335(13.2)

M2OD-18HFN1-M

M3OD-27HRDN1-M

M3OC-30HRFN1-M

900(35.4)

315(12.4)

860(33.9)

980(38.6)

590(23.2)

333(13.1)

M4OC-36HRFN1-M

990(39)

345(13.6)

965(38)

1075(42.3)

624(24.6)

366(14.4)

5. Refrigerant Cycle Diagram

5.1Refrigeration circuit drawing of inverter dual zone

LIQUID VALVE A

GAS VALVE A

HEAT

EXCHANGE

(EVAPORATOR) HEAT

EXCHANGE

(CONDENSER)

Compressor

4-WAY VALVE

COOLING

HEATING

T2 Evaporator

temp. sensor

middle

T1 Room

temp. sensor

Condenser

temp. sensor

T5 Discharge

temp. sensor

T4 Ambient

temp. sensor

INDOOR OUTDOOR

EXV A CAPILIARY A

CHECK VALVE

CAPILIARY TUBE

EXV B CAPILIARY B

LIQUID VALVE B

GAS VALVE B

Accumulator

T2B-A Evaporator

temp. sensor outlet

T2B-B

5.2 Refrigeration circuit drawing of inverter tri-zone

LIQUID VALVE A

GAS VALVE A

HEAT

EXCHANGE

(EVAPORATOR) HEAT

EXCHANGE

(CONDENSER)

Compressor

4-WAY VALVE

COOLING

HEATING

T2 Evaporator

temp. sensor

middle

T1 Room

temp. sensor

Condenser

temp. sensor

T5 Discharge

temp. sensor

T4 Ambient

temp. sensor

INDOOR OUTDOOR

EXV A CAPILIARY A

CHECK VALVE

CAPILIARY TUBE

EXV B CAPILIARY B

LIQUID VALVE B

GAS VALVE B

EXV C CAPILIARY C

LIQUID VALVE C

GAS VALVE C Accumulator

T2B-A Evaporator

temp. sensor outlet

T2B-B

T2B-C

5.3 Refrigeration circuit drawing of inverter qua-zone

LIQUID VALVE A

GAS VALVE A

HEAT

EXCHANGE

(EVAPORATOR) HEAT

EXCHANGE

(CONDENSER)

Compressor

4-WAY VALVE

COOLING

HEATING

T2 Evaporator

temp. sensor

middle

T1 Room

temp. sensor

Condenser

temp. sensor

T5 Discharge

temp. sensor

T4 Ambient

temp. sensor

INDOOR OUTDOOR

EXV A CAPILIARY A

CHECK VALVE

CAPILIARY TUBE

EXV B CAPILIARY B

LIQUID VALVE B

GAS VALVE B

EXV C CAPILIARY C

LIQUID VALVE C

GAS VALVE C

EXV D CAPILIARY D

LIQUID VALVE D

GAS VALVE D

Accumulator High pressure

switch

Low pressure

switch

T2B-A Evaporator

temp. sensor outlet

T2B-B

T2B-C

T2B-D

6. Installation Details

6.1 Wrench torque sheet for installation

Outside diameter

Torque

Additional tightening torque

inch

N.cm

Ф6.35

1/4

1500(153kgf.cm)

1600(163kgf.cm)

Ф9.52

3/8

2500(255kgf.cm)

2600(265kgf.cm)

Ф12.7

1/2

3500(357kgf.cm)

3600(367kgf.cm)

6.2 Connecting the cables

The power cord connection should be

selected according to the following

specifications sheet.

Unit

AWG

Dual-zone(18K outdoor unit)

Tri-zone (27K/30K outdoor unit).

Quad-zone(36K outdoor unit)

For indoor unit and outdoor unit connection

line, 16AWG is ok for all.

6.3 Pipe length and the elevation

Maximum piping length and height difference

1 drive 2

1 drive 3

1 drive 4

Max. length for all rooms

(m)

30(98ft)

45(150ft)

60(200ft)

Max. length for one IU (m)

20(65.6ft)

25(82ft)

30(98ft)

Max. height

difference

between IU

and OU (m)

higher

than IU

10(33ft)

OU lower

than IU

15(49.2ft)

Max. height difference

between IUs (m)

10(33ft)

Additional refrigerant charge

1 drive 2

1 drive 3

1 drive 4

Chargeless pipe

length (m)

15(49.2ft)

22.5(73.8ft)

30(98.4ft)

Additional

refrigerant

charge

15 x (length

for all rooms -

15)

15 x (length

for all rooms –

22.5)

15 x (length

for all rooms -

30)

(.0.161

x(length for all

rooms –

49.2))

(.0.161

x(length for all

rooms –

73.8))

(.0.161x(lengt

h for all rooms

–98.4))

Caution:

●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)

Liquid

6.35(1/4)

Liquid

6.35(1/4)

Gas

9.52(3/8)

Gas

9.52(3/8)

12K 18K

Liquid

6.35(1/4)

Liquid

6.35(1/4)

Gas

12.7(1/2)

Gas

12.7(1/2)

Outdoor unit union diameter (mm/inch)

Indoor unit A/B/C/D

Liquid

6.35(1/4)

Gas

9.52(3/8)

6.4 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

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(14.5Psi). If the meter does not indicate -

0.1Mpa(14.5Psi) after pumping 30 minutes, it

should be pumped 20 minutes more. If the

pressure can’t achieve -0.1Mpa(14.5Psi) 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.

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 0.3Mpa(43.5Psi) to 0.5

Mpa(72.5Psi)..

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.

3. Adding refrigerant if the pipe length

exceeds chargeless pipe length

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