Mitsubishi Electric MXZ-18NV Service Manual

Inverter-controlled multi system split-type, heat pump air conditioners

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SPLIT-TYPE,HEAT PUMP AIR CONDITIONERS

SERVICE MANUAL

Inverter-controlled multi system

Models

MXZ-18NV -

MXZ-32NV -

MXZ-18NV -

MXZ-32NV -

MXZ-32NV

This manual describes technical data of outdoor unit.

For indoor unit refer to the service manuals No.OB207 and OB196 REVISED EDITION A of corresponding

models.

CONTENTS

1. TECHNICAL CHANGES ····································2

2. PART NAMES AND FUNCTIONS······················2

3. INDOOR /OUTDOOR

4. INDOOR UNITS COMBINATION ·······················4

5. SPECIFICATION·················································9

6. OUTLINES AND DIMENSIONS························11

7. WIRING DIAGRAM ··········································13

8. REFRIGERANT SYSTEM DIAGRAM ··············15

9. PERFORMANCE CURVES ······························20

10. MICROPROCESSOR CONTROL ····················30

11. TROUBLESHOOTING ······································39

12. DISASSEMBLY INSTRUCTIONS·····················53

Model indication

13. PARTS LIST······················································57

14. OPTIONAL PARTS ····································BACK

Revision:

MXZ-18NV-

and MXZ-18NV-

Page layout has been changed.

Performance curves has been modified.

The graph of the outdoor low pressure in the HEAT

operation of the PERFORMANCE CURVE of MXZ-

32NV was deleted.

Please void OB185 REVISED EDITION A and B.

CORRESPONDENCE TABLE··········3

have been added.

No. OB185

REVISED EDITION C

Table of Contents

Summary of Contents for Mitsubishi Electric MXZ-18NV

Page 1: Service Manual
Revision: MXZ-18NV- and MXZ-18NV- have been added. Page layout has been changed. Performance curves has been modified. The graph of the outdoor low pressure in the HEAT operation of the PERFORMANCE CURVE of MXZ- 32NV was deleted. Please void OB185 REVISED EDITION A and B.
Page 2: Technical Changes
TECHNICAL CHANGES MXZ-18LV- MXZ-18NV- 1. Inverter assembly has changed. 2. Gas pipe thermistors were added. 3. H.P.S. has changed. MXZ-18NV- MXZ-18NV- 1. MSH-07NV - and MSH-12NV - has been added to the combination of the connectable indoor units. 2. Outdoor unit electronic control P.C. board has changed.
Page 3 INDOOR / OUTDOOR CORRESPONDENCE TABLE MXZ-18NV OUTDOOR UNIT MXZ-18NV- MXZ-18NV- 09+09 09+09 07+12 MXZ-32NV OUTDOOR UNIT MXZ-32NV- MXZ-32NV- 07+07+07 07+07+07 07+07+09 07+07+09 07+07+(12 or 13) 07+07+12 07+07+18 07+07+18 07+09+09 07+09+09 07+09+(12 or 13) 07+09+12 07+09+18 07+09+18 07+(12 or 13)+(12 or 13)
Page 4: Indoor Units Combination
INDOOR UNITS COMBINATION MXZ-18NV NOTE:Electrical data is for outdoor unit only. Outdoor unit Power Cooling capacity (kW) Current Indoor units power consumption factor combination Unit A Unit B Total (kW) 220V 240V 1.02 89 - 90 5.20 4.72 (1.6 - 2.8) (0.855 - 1.33)
Page 5 MXZ-32NV NOTE: Electrical data is for outdoor unit only. Heating capacity (kw) Outdoor unit Current Power Indoor units power consumption factor combination Total Unit A Unit B Unit C Unit D (kw) 220V 240V 1.00 5.05 4.63 (1.8-2.7) (0.96-1.14) 1.77 5.91 5.42 (1.8-3.2)
Page 6 NOTE: Electrical data is for outdoor unit only. Heating capacity (kw) Outdoor unit Current Power Indoor units power consumption factor combination Total Unit A Unit B Unit C Unit D (kw) 220V 240V 3.23 09+09+09 2.67 2.67 2.67 16.31 14.95 (3.7-9.0) (1.30-3.96) 3.23...
Page 7 NOTE: Electrical data is for outdoor unit only. Heating capacity (kw) Outdoor unit Current Power Indoor units power consumption factor combination Total Unit A Unit B Unit C Unit D (kw) 220V 240V 1.20 6.06 5.55 (2.1-3.6) (0.91-1.28) 1.43 7.22 6.62 (2.1-4.2) (0.91-1.51)
Page 8 NOTE: Electrical data is for outdoor unit only. Heating capacity (kw) Outdoor unit Current Power Indoor units power consumption factor combination Total Unit A Unit B Unit C Unit D (kw) 220V 240V 2.78 09+09+09 14.04 12.87 (5.2-10.6) (1.19-2.96) 2.78 09+09+12(13) 2.65 2.65...
Page 9 SPECIFICATION Model MXZ-18NV- MXZ-18NV- Indoor units number Max. 30 Piping total length Max. 20 Connecting pipe length Max. 7 Height difference (indoor ~ outdoor) Max. 7 Height difference (indoor ~ indoor) Capacity 4.5 (1.7 ~ 4.5) Cooling Sound level Capacity 5.8 (2.0 ~ 5.8)
Page 10 Model MXZ-32NV- MXZ-32NV- Indoor units number Max. 60 Piping total length Max. 25 Connecting pipe length Max. 10 Height difference (indoor ~ outdoor) Max. 10 Height difference (indoor ~ indoor) Capacity 8.0 (1.8 ~ 9.0) Cooling 45-47 Sound level 9.3 (2.1 ~ 10.6) Capacity Booster heater Heating...
Page 11: Outlines And Dimensions
OUTLINES AND DIMENSIONS MXZ-18NV - MXZ-18NV - Unit:mm...
Page 12 MXZ-32NV - MXZ-32NV - Unit:mm 531.3 480.8 (16) (16) Base bollt length 350.0 Less than More than More than More than More than More than...
Page 13: Wiring Diagram
WIRING DIAGRAM MODELS MXZ-18NV- MXZ-18NV- GRN/YLW NF62 NF61 POWER SUPPLY DS63 220-240V 50Hz CIRCUIT BREAKER DC24V INDOOR LD71 LD73 UNIT (B) INDOOR LD74 UNIT CONNECTING DC24V LD72 LD77 21S4 INDOOR UNIT (A) DS61 4 3 2 1 2 3 4 5...
Page 14 MODELS MXZ-32NV- MXZ-32NV- DS62 DS61 REDR NOISE FILTER P.C.BOARD GRN/YLW POWER SUPPLY 63H2 ~/N 220-240V 50Hz LD62 LD61 F911 RELAY P.C. BOARD CIRCUIT BRAKER T801 TAB64 CN913 CN912 CN720 TAB65 CN901 CN902 INDOOR (A) 12VDC UNIT CT62 GRN/YLW 1 2 3 4 5 6 INDOOR TAB66 (B) 12VDC...
Page 15: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM 8.1 REFRIGERANT SYSTEM DIAGRAM Unit:mm Refrigerant flow in cooling Refrigerant flow in heating MXZ-18NV - MXZ-18NV - Service Compressor port (Low pressure) Discharge temperature thermistor RT62 Muffler High pressure switch Service port (high pressure) Reversing valve Gas pipe...
Page 16 8.2 MAX REFRIGERANT PIPING LENGTH MXZ-18NV - MXZ-18NV - Outodoor unit Piping length for each indoor unit (a,b) Total piping length (a+b) Height difference between units (H) Bending point for each unit Total bending point It does not matter which unit is higher...
Page 17 8.3 PIPE SIZE SELECTION MXZ-18NV - MXZ-18NV - Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the table below. When diameter of refrigerant pipe is different from that of outdoor unit union, use optional L-joint. For further information on L-joint, see page 62.
Page 18 8.4 EVACUATION PROCEDURES MXZ-18NV - MXZ-18NV - CAUTION : If you run this unit with air in its refrigerant pipe before air purge, the compressor will decline in cooling capacity, which may result in trouble. . Connect the refrigerant pipes (both the liquid and gas pipes) between the indoor and the uotdoor units.
Page 19 MXZ-32NV - MXZ-32NV - For details about how to use manifold valves, see the instruction manual for manifold valves. The valve knob Hi below cannot operate during the following work if it is fully closed. Warning : When installing or moving the unit, do not mix anything other than specified refrigerant (R-22) into the refrigerating cycle.
Page 20: Performance Curves
PERFORMANCE CURVES The standard data contained in these specifications apply only to the operation of the air conditioner, that is one indoor unit with one outdoor unit, under normal conditions. Since operating conditions vary according to the areas where these units are installed.
Page 21 9.1.Capacity and input correction by inverter output frequency (OUTDOOR UNIIT:MXZ-18NV) NOTE 1 : Inverter output frequency : COOL 58Hz,HEAT 58Hz NOTE 2 : The dotted line on graphs connects the frequency range in normal operation shown by the full line and the frequency in test run shown by the point.
Page 22 9.2.Capacity and input correction by inverter output frequency (OUTDOOR UNIIT:MXZ-18NV) NOTE 1 : Inverter output frequency : COOL 58Hz,HEAT 40Hz NOTE 2 : The dotted line on graphs connects the frequency range in normal operation shown by the full line and the frequency in test run shown by the point.
Page 23 9.3.Outdoor low pressure and outdoor unit current 9.3.1.07-class unit in single operation(OUTDOOR UNIT : MXZ-18NV) NOTO:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below.
Page 24 9.3.2.09-class unit in single operation (OUTDOOR UNIT : MXZ-18NV) NOTO:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below.
Page 25 9.3 .3. 12-class unit in single operation (OUTDOOR UNIT : MXZ-18NV) NOTO:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below.
Page 26 9.4.Outdoor low pressure and outdoor unit current 9.4.1.07-class unit in single operation (OUTDOOR UNIT : MXZ-32NV) NOTO:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below. 1(MPa •...
Page 27 9.4.2.09-class unit in single operation (OUTDOOR UNIT : MXZ-32NV) NOTO:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below. 1(MPa •...
Page 28 9.4.3. 12(13)-class unit in single operation (OUTDOOR UNIT : MXZ-32NV) NOTO:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below. 1(MPa •...
Page 29 9.4.4. 18-class unit in single operation NOTO:The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below. 1(MPa • G) =10.2(kgf/f f •...
Page 30: Microprocessor Control
MICROPROCESSOR CONTROL 10.1.System organization MXZ-18NV - MXZ-18NV - <Electronic controls> Compressor Compressor secondary primary Indoor unit A current current Indoor unit B Outdoor unit microprocessor Drive circuit 4- Way Outdoor valve relay relay Outdoor fan Transistor speed control module relay...
Page 31 MXZ-32NV - MXZ-32NV - Compressor Compressor Power secondary primary factor current current Indoor unit microprocessor Outdoor unit control microprocessor Drive circuit Transistor module Crankcase heater L.P.S Accumlator Comp. Inner thermostat x 61 Suction temperature x 62 thermistor x 63 H.P.S Discharge temperature Indoor Unit...
Page 32 Item Details LEV control Linear expansion valve (LEV) is controlled by "Thermostat ON" commands given from each unit. LEV opening Indoor unit status MXZ-18NV MXZ-32NV All indoor units OFF Before shutdown 350 pulse 500 pulse COOL : 5 pulse COOL : 5 pulse...
Page 33 Details LEV opening correction by suction superheat (Suction superheat) = (Suction temperature) - (Evaporation temperature) The LEV opening is corrected as shown in the following table. LEV opening correction (pulse) Suction superheat (S.H.) MXZ-18NV- MXZ-18NV- MXZ-32NV- E1 E2 Cooling Heating...
Page 34 COOL mode. (The outdoor unit operates in the DRY mode only when all the indoor units are operating in the DRY mode.) Outdoor fan control The outdoor fan turns ON according to "Compressor ON" commands given from each indoor unit. MXZ-18NV- E1 MXZ-18NV- E2 Number of operating...
Page 35 Item Details Operational Compressor operational frequency range frequency range COOLING MXZ-18NV- Number of Indoor unit Minimum Maximum DRY mode Rating operating unit capacity class 09+09 MXZ-18NV- Number of Indoor unit Minimum Maximum DRY mode Rating operating unit capacity class 07 or 09...
Page 36 2 - way valve will open. (2) High pressure protection by high pressure switch (H.P.S : MXZ-18NV , 63H1 : MXZ-32NV) • The operational frequency, 2 - way valve (only MXZ-32NV), and outdoor fan motor are controlled by the high pressure switch to protect excessive high pressure.
Page 37 Item Details <Protection details> a) In COOL or DRY mode • The 2 - way valve opens. • The compressor operational frequency decreases at a rate of 10 Hz/minute. b) In HEAT mode • The 2 - way valve opens. •...
Page 38 <Conditions to discontinue refrigerant recovery> The system discontinues refrigerant recovery when it satisfies either of the following conditions. Then the LEV opening is controlled to 59(MXZ-32NV) / 49(MXZ-18NV) pulse. • Sixty seconds have passed since the start-up of refrigerant recovery.
Page 39: Troubleshooting
TROUBLESHOOTING 11.1 Cautions on troubleshooting 11.1.1 Before troubleshooting, check the followings : 1) Check the power supply voltage. 2) Check the indoor / outdoor connecting wire for mis-wiring. 11.1.2 Take care the followings during servicing. 1) Before servicing the air conditioner,be sure to first turn off the remote controller to stop the main unit,and then after confirming the horizontal vane is closed,turn off the breaker.
Page 40 <Outdoor controll board> (1) Troubleshooting table Note 1. LED position is shown at right. Microprocessor Note 2. LED indicates "00" in the normal status. 7-segment LED display Error mode Normal LED1 <MXZ-32NV> If there is defect in the following parts(electronic control P.C. board, relay P.C. board, high pressure switches(63H1,63H2),indoor /outdoor fan motor , or indoor coil thermistor), the compressor may stop even with the display remained at “...
Page 41 • Check the ball valve. Low pressure switch When the low pressure has been 0.05Mpa(0.5 kgf/cm -G) for 5 minutes • Check the pipes for bending or clogging protection or more, the compressor stops and restarts in 3 minutes. • Check the LEV operation. •...
Page 42 (2) Checking the mis-wiring and serial signal error (Only MXZ-32NV) <The outdoor unit does not operate.> Single or repeated blinks appears on the operation indicator (on the left-hand side). Using the light emitting diode LED1 on the indoor controller board (See the indoor unit service manual) , locate the defect in the following procedure.
Page 43 100kΩ ~ 250kΩ Opened or short-circuited Measure the resistance between terminals using a tester. Compressor (Winding temperature : -10°C ~ 40°C) Normal abnormal MXZ-18NV MXZ-32NV Opened or short-circuited Each phase 1.05Ω ~ 1.29Ω Each phase 0.47Ω ~ 0.58Ω Outdoor fan motor Measure the resistance between lead wires using a tester.
Page 44 (Simple check methods for inverter / compressor) Disconnect the compressor lead wire. S t a r t Check the voltage between Proceed to the A A for checking for open phase. the terminals. Check the resistance of Balanced? Proceed to B B for checking the the transistor module transistor module.
Page 45 BLK - RED Normal WHT - RED (One to dozens of ohms) <Judgment> 1.05 ~ 1.29Ω (MXZ-18NV), 0.47 ~ 0.58Ω (MXZ-32NV) at -10 °C ~ 40 °C of winding temperature. Faulty (Zero ohms or short) Zero (Ω) : Faulty (Short) Infinite (Ω) : Faulty (Open)
Page 46 Cooling operation works when heating is expected. • First, measure the resistance of the reversing valve coil to check the integrity. • If connector CN61(MXZ-18NV), CN913(MXZ-32NV) is not connected or the reversing valve coil is open, voltage occurs between terminals even when the control is OFF.
Page 47 H Checking the outdoor fan motor • First, measure the resistance of the 4-way valve The outdoor fan motor remains stopped. coil to check the integrity. <MXZ-18NV> Disconnect CN63 TAB91 Outdoor control board or and outdoor electronic outdoor relay board defective.
Page 48 (dust adherence) M Checking the liner expansion valve (LEV) The outdoor control system stops due to abnormality. <MXZ-18NV> LEV operates for the first 30 seconds after power supply is turned ON. Turn OFF the power supply and make sure that LEDs While LEV is operating, check that there is 12V DC pulse amplitude on outdoor electronic control P.C.
Page 49 MXZ-18NV - MXZ-18NV - Ourdoor unit electronic control P.C. board 2~3V DC 2~3V DC Power supply 12V DC input Power 330V DC supply Fuse 3A Electron expansion valve 12V DC pulse shape High-pressure Fin temperature Fin temperature switch short thermistor...
Page 50 MXZ-18NV - MXZ-18NV - Relay P.C. board Short : Normal Open : Abnomal 220-240V AC Fuse 3.15A...
Page 51 Gas pipe temperature thirmistor Fin temperature thirmistor TEST POINT DIAGRAM AND VOLTAGE Evaporation temperature thirmistor Suction temperature thirmistor MXZ-32NV MXZ-32NV Defrost temperature thirmistor Electronic control P.C.board Defrost temperature thermistor 2.5~4.0V DC Suction temperature thermistor 0.3~0.6V DC Temperature(;) Evaporation temperature thermistor crank case heater 12V DC 2.5~4.0V DC Temperature(;)
Page 52 Noise filter P.C.board 230V AC OUTDOOR FAN 230V AC OUTPUT 230V AC INPUT CRANK CASE HEATER 230V AC 4 WAY VALVE 230V AC 2 WAY VALVE 230V AC I.P.M. P.C.board 12V DC 12V DC 320V DC Relay P.C.board 12V DC High pressure switch 12V DC...
Page 53: Disassembly Procedure
DISASSEMBLY PROCEDURE 11-2 OUTDOOR UNIT MXZ-18NV - MXZ-18NV - Sleeb NOTE: on the wiring diagram shows the terminals with a lock mechanism, so it Protrusion of cannot be removed when you pull the lead wire be sure to pull the wire by locking lever pushing the locking lever (projected part) of the terminal with a finger.
Page 54 OPERATING PROCEDURE PHOTOS Removing the outdoor fan motor Photo 4 (1) Remove the top panel, service panel, and front panel. (2) Disconnect the connector CN63,TAB91 from the outdoor electronic control P.C. board. (3) Remove the propeller. (4) Remove the outdoor fan motor. Fan motor Propeller...
Page 55 MXZ-32NV - MXZ-32NV - Sleeb NOTE: on the wiring diagram shows the terminals with a lock mechanism, so it Protrusion of cannot be removed when you pull the lead wire be sure to pull the wire by locking lever pushing the locking lever (projected part) of the terminal with a finger. OPERATING PROCEDURE PHOTOS 1.Removing the compressor...
Page 56 OPERATING PROCEDURE PHOTOS 3.Removing the 4-way valve Photo 4 (1)Remove the screws of the top panel , and remove it.(See Photo 1.) (2)Remove the service panel,rear panel,and connect cover 4 way valve panel.Release refrigerant gas. (3)Remove the electrical parts.(See Photo 2.) (4)Detach the brazed joint of 4-way valve and pipe.(See Photo 4 way valve coil Brazing area...
Page 57: Parts List
PARTS LIST OUTDOOR UNIT STRUCTURAL PARTS MXZ-18NV - MXZ-18NV - Symbol Q'ty / unit Parts No. Parts Name in Wiring MXZ-18NV Remarks Diagram M21 LL4 232 FRONT PANEL M21 LL4 521 FAN GUARD M21 LL4 297 TOP PANEL M21 LL4 245...
Page 58 OUTDOOR UNIT FUNCTURAL PARTS MXZ-18NV - MXZ-18NV - Part number that are circed is not shown in the illustration. Symbol Q'ty / unit Parts No. Parts Name in Wiring MXZ-18NV Remarks Diagram M21 LL4 501 PROPELLER T2W E41 301 RA6V50-...
Page 59 OUTDOOR UNIT ELECTRICAL PARTS MXZ-18NV - MXZ-18NV - Part number that are circed is not shown in the illustration. Symbol Q'ty / unit Parts No. Parts Name in Wiring MXZ-18NV Remarks Diagram M21 A19 447 DS63 DIODE MODULE M21 U48 362...
Page 60 OUTDOOR UNIT STRUCTURAL PARTS MXZ-32NV MXZ-32NV Part of circled number is not shown in the figure. Symbol Q'ty / unit Parts No. Parts Name in Wiring MXZ-32NV Remarks Diagram M21 17A 501 PROPELLER T2W E40 301 MF61 OUTDOOR FAN MOTOR T2W E40 452 IPM P.C.
Page 61 OUTDOOR UNIT FUNCTIONAL PARTS MXZ-32NV MXZ-32NV Part of circled number is not shown in the figure. Symbol Q'ty / unit Parts No. Parts Name in Wiring MXZ-32NV Remarks Diagram M21 17A 232 FRONT PANLE M21 17A 245 SERVICE PANEL M21 17A 249 SIDE PANEL M21 17A 297 TOP PANEL...
Page 62: Optional Parts
PAC-SB83DS 7D2-B83 HEAD OFFICE MITSUBISHI DENKI BLDG.MARUNOUCHI TOKYO100 TELEX J24532 CABLE MELCO TOKYO C C Copyright 1997 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. New publication,effective Mar. 1998. Issued in Mar. 1998. MEE No.OB185 REVISED EDITION C 217 Specifications subject to change without notice Issued in Oct.

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Mitsubishi Electric MXZ-18NV Service Manual

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