Multi Zone Outdoors Service Manual

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Midea Multi Zone Outdoor Service Manual

Text of Multi Zone Outdoors Service Manual

ODMI-C-1211

SERVICE MANUALMIDEA AIRCONDITIONER North America MARKET DC INVERTER MULTI TYPEM2OC-18HRDN1-M M3OC-27HRDN1-M M3OD-27HRDN1-M M4OC-36HRDN1-M M4OC-36HRFN1-M

DC MULTI OUTDOOR UNITS

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CONTENTS1. General information of Outdoor Units ................................................... 2 2.Features .................................................................................................... 3 3. Dimensions .............................................................................................. 4 4. Wiring Diagram ........................................................................................ 5 5. Refrigeration Cycle Diagram .................................................................. 8 6. Indoor units combination ..................................................................... 10 7. Installation Details ................................................................................. 11 8. Electronic control function ................................................................... 21 9. Troubleshooting .................................................................................... 28

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1. General information of Outdoor UnitsModel name M2OC-18HRDN1-M M3OC-27HRDN1-M M3OD-27HRDN1-M M4OC-36HRDN1-M M4OC-36HRFN1-M Dimension (mm(in)) 845x320x700(33.3x12.6x27.6) 845x320x700(33.3x12.6x27.6) 845x320x700(33.3x12.6x27.6) 990x345x965(39x13.6x38) 990x345x965(39x13.6x38) Compressor DA130S1C-20FZ DA150S1C-20FZ DA150S1C-20FZ TNB306FPGMC-L TNB306FPGMC-L

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2 FeaturesOutdoor unit

Power relay control

Low noise air flow system

Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode. 4 way valve control It is only operated in the heating operation mode except defrosting operation. Anti-rust cabinet

Valve protection cover It protects the valves and prevents water from dripping.

Discharge pipe temperature protection

Compressor crankcase heater

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3. Dimensions

mm(in)Model M2OC-18HRDN1-M M3OC-27HRDN1-M M3OD-27HRDN1-M M4OC-36HRDN1-M M4OC-36HRFN1-M 990(39) 345(13.6) 965(38) 1075(42.3) 624(24.6) 366(14.4) 845((33.3) 320(12.6) 700(27.6) 908(35.7) 560(22) 335(13.2) W D H W1 A B

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4. Wiring Diagram4.1 M2OC-18HRDN1-M

4.2 M3OC-27HRDN1-M

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4.3M3OD-27HRDN1-M

4.4 M4OC-36HRDN1-M

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4.5 M4OC-36HRFN1-M

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5. Refrigeration Cycle Diagram5.1Refrigeration circuit drawing of inverter dual zoneINDOORLIQUID VALVE A EXV A CAPILIARY A CHECK VALVE LIQUID VALVE B EXV B CAPILIARY B T3 Condenser temp. sensor

OUTDOOR

CAPILIARY TUBE

HEAT EXCHANGE (EVAPORATOR)

T1 Room temp. sensor

T4 Ambient temp. sensor

HEAT EXCHANGE (CONDENSER)

T2 Evaporator temp. sensor

GAS VALVE A 4-WAY VALVE GAS VALVE BAccumulator

T5 Discharge temp. sensor Compressor COOLING HEATING

5.2 Refrigeration circuit drawing of inverter tri-zoneINDOORLIQUID VALVE A EXV A CAPILIARY A

OUTDOOR

LIQUID VALVE B

EXV B CAPILIARY B

CHECK VALVE

LIQUID VALVE C

EXV C CAPILIARY C CAPILIARY TUBE

T3 Condenser temp. sensor

HEAT EXCHANGE (EVAPORATOR)

T1 Room temp. sensor

T4 Ambient temp. sensor

HEAT EXCHANGE (CONDENSER)

T2 Evaporator temp. sensor

GAS VALVE A

GAS VALVE B

4-WAY VALVE

GAS VALVE CAccumulator

T5 Discharge temp. sensor Compressor

COOLING HEATING

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5.3 Refrigeration circuit drawing of inverter qua-zoneINDOORLIQUID VALVE A EXV A CAPILIARY A

OUTDOOR

LIQUID VALVE B

EXV B CAPILIARY B CHECK VALVE

LIQUID VALVE C

EXV C CAPILIARY C T3 Condenser temp. sensor

LIQUID VALVE D

EXV D CAPILIARY D

CAPILIARY TUBE

HEAT EXCHANGE (EVAPORATOR)

T1 Room temp. sensor

T4 Ambient temp. sensor

HEAT EXCHANGE (CONDENSER)

GAS VALVE A T2 Evaporator temp. sensor

GAS VALVE B 4-WAY VALVE GAS VALVE C GAS VALVE DLow pressure switch Accumulator High pressure switch

COOLING HEATING

T5 Discharge temp. sensor

Compressor

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6. Indoor units combination6.1 Indoor unit combination for M2OC-18HRDN1-MComb. Combinations Unit A Unit B 9k 12k 18k 9k 9k 9k 12k 12k 12k

Dual(1x1)

Dual (1x2)

6.2 Indoor unit combination for M3OC-27HRDN1-MM3OD-27HRDN1-MComb. Combinations Unit A Unit B Unit C 9k 12k 18k 9k 9k 9k 12k 9k 18k 12k 12k 12k 18k 9k 9k 9k 9k 9k 12k 9k 12k 12k

TRI (1x1)

TRI (1x2)

TRI (1x3)

6.3 Indoor unit combination for M4OC-36HRDN1-MM4OC-36HRFN1-MComb. Unit A 9k 12k 18k 9k 9k 9k 12k 12k 18k 9k 9k 9k 9k 9k 9k 12k 12k 12k 9k 9k 9k 9k 9k 9k 9k 12k 12k Combinations Unit B Unit C 9k 12k 18k 12k 18k 18k 9k 9k 9k 12k 9k 18k 12k 12k 12k 18k 18k 18k 12k 12k 12k 18k 18k 18k 9k 9k 9k 9k 9k 9k 9k 12k 9k 12k 12k 12k 12k 12k 12k 12k 12k 12k Unit D 9k 12k 18k 12k 18k 12k 18k 12k 18k

QUA (1x1)

QUA (1x2)

QUA (1x3)

QUA(1x4)

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7. Installation Details7.1 Wrench torque sheet for installationOutside diameter mm 6.35 9.52 12.7 inch 1/4 3/8 1/2 Torque N.cm 1500(153kgf.cm) 2500(255kgf.cm) 3500(357kgf.cm) Additional tightening torque N.cm 1600(163kgf.cm) 2600(265kgf.cm) 3600(367kgf.cm)

7.2 Connecting the cablesThe power cord of connect should be selected according to the following specifications sheet.For power line:

UnitDual-zone(18K outdoor unit) Tri-zone (27K outdoor unit). Quad-zone(36K outdoor unit)

AWG14 14 12

For indoor unit and outdoor unit connection line, 16AWG is ok for all.

7.3 Pipe length and the elevationMaximum piping length and height difference 1 drive 2 Max. length for all rooms (m) Max. length for one IU (m) Max. height difference between IU and OU (m) OU higher than IU OU lower than IU 30(98ft) 20(65.6ft) 10(33ft) 15(49.2ft) 10(33ft) 1 drive 3 45(150ft) 25(82ft) 10(33ft) 15(49.2ft) 10(33ft) 1 drive 4 60(200ft) 30(98ft) 10(33ft) 15(49.2ft) 10(33ft)

Max. height difference between IUs (m)

Additional refrigerant charge 1 drive 2 Chargeless pipe length (m) Additional refrigerant charge (g(oz)) 10(33ft) 15 x (length for all rooms - 10) (.0.529 x(length for all rooms - 33)) Caution:11

1 drive 3 15(49.2ft) 15 x (length for all rooms - 15) (.0.529 x(length for all rooms 49.2))

1 drive 4 20(65.6ft) 15 x (length for all rooms - 20) (.0.529 x(length for all rooms 65.6))

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 Liquid 9K Gas Liquid 12K 18K Gas Outdoor unit union diameter (mm/inch) Liquid Indoor unit A/B/C/D Gas 9.52(3/8) 6.35(1/4) 12.7(1/2) Gas 12.7(1/2) 9.52(3/8) 6.35(1/4) Gas Liquid 9.52(3/8) 6.35(1/4) Pipe diameter (mm/inch) 6.35(1/4) Liquid 6.35(1/4)

7.4 Installation for the first timeAir 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

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(Indoor unit)

(Liquid side) Two-way valve Close (Gas side) Three-way valve

(Outdoor unit)

Manifold valve Compound meter Pressure gauge -0.1MPaLo Hi

Close

Handle Lo Charge hose Vacuum pump

Handle Hi Charge hose

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. If the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If the pressure cant 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. 2. Air purging by refrigerant

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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