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SERVICE MANUAL
Models
MXZ-2DM40VA
MXZ-3DM50VA
MXZ-2DM40VA
NOTE:
RoHS compliant products have <G> mark
on the spec name plate.
HFC
utilized
R410A
-
E1
,
ET1
,
ER1
-
E1
,
ET1
,
ER1
Indoor unit service manual
MSZ-DM•VA Series (OBH750)
MSZ-HJ•VA Series (OBH647)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 6
5. OUTLINES AND DIMENSIONS ························ 7
6. WIRING DIAGRAM ············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ············· 10
8. PERFORMANCE CURVES ····························· 13
9. ACTUATOR CONTROL ··································· 19
10. SERVICE FUNCTIONS ···································· 20
11. TROUBLESHOOTING ····································· 24
12. DISASSEMBLY INSTRUCTIONS ···················· 50
INDOOR UNITS COMBINATION SHEETS
PARTS CATALOG (OBB739)
Revision A:
• MXZ-2DM40VA -
and MXZ-
ER1
3DM50VA -
have been added.
ER1
Please void OBH739.
No. OBH739
REVISED EDITION-A
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Table of Contents
Related Manuals for Toshiba MXZ-2DM40VA
Summary of Contents for Toshiba MXZ-2DM40VA
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Page 1: Table Of Contents
Revision A: • MXZ-2DM40VA - and MXZ- 3DM50VA - have been added. Please void OBH739. OUTDOOR UNIT No. OBH739 utilized REVISED EDITION-A SERVICE MANUAL R410A Models MXZ-2DM40VA MXZ-3DM50VA Indoor unit service manual MSZ-DM•VA Series (OBH750) MSZ-HJ•VA Series (OBH647) CONTENTS 1. TECHNICAL CHANGES ··································· 2 2. -
Page 2: Technical Changes
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to touch the live parts. Revision A: • MXZ-2DM40VA - and MXZ-3DM50VA - have been added. TECHNICAL CHANGES... -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS MXZ-3DM50VA MXZ-2DM40VA Air inlet Air inlet (Back and side) (Back and side) Piping Drain hose Air outlet Air outlet Drain outlet Drain outlet ACCESSORIES Model MXZ-2DM40VA MXZ-3DM50VA Drain socket Drain cap OBH739A... -
Page 4: Specification
SPECIFICATION Outdoor model MXZ-2DM40VA Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number Piping total length Max. 30 Connecting pipe length Max. 20 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. - Page 5 Outdoor model MXZ-3DM50VA Single phase Outdoor unit power supply 230 V, 50 Hz Indoor units number 2 to 3 Piping total length Max. 50 Connecting pipe length Max. 25 Height difference (Indoor ~ Outdoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
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Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MXZ-2DM40VA MXZ-3DM50VA FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE High Cooling High Cooling High Heating High Heating NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF NC-20... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MXZ-2DM40VA Unit: mm OBH739A... - Page 8 MXZ-3DM50VA Unit: mm Liquid pipe : Ø6.35(flared)1/4 C unit connection Gas pipe : Ø9.52(flared)3/8 Liquid pipe : Ø6.35(flared)1/4 B unit connection Gas pipe : Ø9.52(flared)3/8 Liquid pipe : Ø6.35(flared)1/4 A unit connection Gas pipe : Ø9.52(flared)3/8 1.Installation space Note : Leave front and both sides 100 or more free of obstruction.
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Page 9: Wiring Diagram
WIRING DIAGRAM MXZ-2DM40VA - 21S4 GRN/YLW POWER SUPPLY CN721 CN722 LD70 LD66A LD66B 230V 50Hz DB61 C62 C61 LD-E1 CIRCUIT T801 IC802 IC820 BREAKER F801 LD62 ACL2 PTC64 PTC65 F901 LD-E2 CN642 F701 RED WHT INVERTER P.C. BOARD 12-24V TO INDOOR... -
Page 10: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM UNIT: mm MXZ-2DM40VA Compressor Discharge temperature Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Muffler Indoor unit 4-way valve Stop valve Sub muffler (with service port) Indoor unit Outdoor heat Stop valve exchanger (with service port) -
Page 11: Max Refrigerant Piping Length
UNIT: mm MXZ-3DM50VA Compressor High-pressure switch Discharge R.V. coil temperature Refrigerant flow in cooling thermistor RT62 Oil separator Capillary tube Refrigerant flow in heating 4-way valve Indoor unit Stop valve with service port Indoor unit Muffler Indoor unit Outdoor heat exchanger temperature FAN-OUT... -
Page 12: Pumping Down
PUMPING DOWN When relocating or disposing of the air conditioner, pump down the system following the procedure below so that no refrigerant is released into the atmosphere. 1) Turn off the breaker. 2) Connect the gauge manifold valve to the service port of the stop valve on the gas pipe side of the outdoor unit. 3) Fully close the stop valve on the liquid pipe side of the outdoor unit. -
Page 13: Performance Curves
PERFORMANCE CURVES MXZ-2DM40VA MXZ-3DM50VA The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed, the following information has been pro- vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. - Page 14 8-1. CAPACITY AND THE INPUT CURVES MXZ-2DM40VA Outdoor intake air Dry-bulb temperature (°C) Outdoor intake air Dry-bulb temperature (°C) 20.6 22.9 19.0 21.1 17.4 19.3 15.8 17.6 14.3 15.8 12.7 14.1 11.1 12.3 10.5 Outdoor intake air Wet-bulb temperature (°C) Outdoor intake air Wet-bulb temperature (°C)
- Page 15 8-2. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY (single operation) MXZ-2DM40VA 25-class unit <COOL>Capacity <HEAT>Capacity <HEAT>Total input <COOL>Total input Frequency Frequency Frequency Frequency 35-class unit <COOL>Capacity <HEAT>Capacity <HEAT>Total input <COOL>Total input Frequency Frequency Frequency Frequency OBH739A...
- Page 16 MXZ-3DM50VA 25-class unit <COOL>Capacity <HEAT>Capacity <HEAT>Total input <COOL>Total input Frequency Frequency Frequency Frequency 35-class unit <COOL>Capacity <HEAT>Capacity <HEAT>Total input <COOL>Total input Frequency Frequency Frequency Frequency 50-class unit <COOL>Capacity <HEAT>Capacity <HEAT>Total input <COOL>Total input Frequency Frequency Frequency Frequency OBH739A...
- Page 17 The conversion factor is: 1 (MPa [Gauge]) = 10.2 (kgf/cm [Gauge]) (1) COOL operation Both indoor and outdoor units are under the Relative humidity (%) Dry-bulb temperature ( ) same temperature/humidity condition. Operation: TEST RUN OPERATION (Refer to 8-3.) MXZ-2DM40VA 25-class unit 35-class unit (MPa[Gauge]) (MPa[Gauge]) 42Hz 42Hz 42Hz...
- Page 18 Indoor Outdoor Dry bulb temperature (°C) 20.0 20.0 Wet bulb temperature (°C) 14.5 14.5 Operation: TEST RUN OPERATION (Refer to 8-3.) MXZ-2DM40VA 25-class unit 35-class unit 48Hz 48Hz Ambient temperature ( ) Ambient temperature ( ) MXZ-3DM50VA 35-class unit 50-class unit...
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Page 19: Actuator Control
ACTUATOR CONTROL MXZ-2DM40VA MXZ-3DM50VA Relation between main sensor and actuator Actuator Sensor Purpose Outdoor Compressor R.V. coil fan motor Discharge temperature thermistor Protection Cooling: Coil frost prevention Indoor coil temperature thermistor Heating: High pressure protection Defrost thermistor Heating: Defrosting Fin temperature thermistor... -
Page 20: Service Functions
SERVICE FUNCTIONS MXZ-2DM40VA MXZ-3DM50VA 10-1. THE POSITION OF SWITCH MXZ-2DM40VA 1 2 3 4 5 6 Outdoor display P.C. board MXZ-3DM50VA 1 2 3 4 5 6 SW871 Oudoor control P.C. board 10-2. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT) With this function, you can lock the operation mode of the outdoor unit. - Page 21 (1) Turn OFF the breaker and make sure that the LED goes off. (2) Set the "3" Switch of SW1 to ON to enable this function. (MXZ-2DM40VA) Set the "3" Switch of SW2 to ON to enable this function. (MXZ-3DM50VA) (3) Turn ON the breaker.
- Page 22 (5) Turn OFF the breaker and make sure that the LED goes off. (6) Turn OFF the "3" of SW2 on the outdoor display P.C. board. (7) Turn ON the breaker. Number of blinks MXZ-2DM40VA Wiring line LED1 (Red) LED2 (Yellow) SW2 on the outdoor display P.C.
- Page 23 To improve start-up condition, the compressor is energized even while it is not operating to generate heat at the winding. The compressor uses about 50 W when pre-heat control is turned ON. Pre-heat control is OFF(MXZ-2DM40VA) / ON (MXZ-3DM50VA) at the default setting.
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Page 24: Troubleshooting
TROUBLESHOOTING MXZ-2DM40VA MXZ-3DM50VA 11-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the unit fi rst with the remote controller, and after confi rming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug. - Page 25 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. 1 Regardless of normal or abnormal condition, 2 short Make sure that the remote controller is set to the failure mode recall function.
- Page 26 3. Outdoor unit failure mode table MXZ-2DM LED indication Indoor/ Upper lamp of (Outdoor P.C. board) outdoor OPERATION Abnormal point unit failure LED 1 LED 2 INDICATOR Condition Remedy (Failure mode/protection) mode lamp (Indoor recall unit) function None (Normal) Not lighted Not lighted — —...
- Page 27 MXZ-3DM LED indication Upper lamp of Indoor/outdoor Abnormal point OPERATION INDICATOR Condition Remedy (Outdoor P.C. board) unit failure mode (Failure mode/protection) lamp (Indoor unit) recall function LED 1 LED 2 None (Normal) Lighted Lighted Outdoor power system 2-time flash Lighted Lighted Overcurrent protection cut-out operates of the compressor 3 consecutive times within 1 minute after...
- Page 28 LED indication Upper lamp of Indoor/outdoor Abnormal point (Outdoor P.C. board) Condition Remedy OPERATION INDICATOR unit failure mode (Failure mode/protection) recall function lamp (Indoor unit) LED 1 LED 2 Communication error 11-time flash Communication error occurs Lighted 6 times Check the connecting between P.C.
- Page 29 11-4. TROUBLESHOOTING CHECK TABLE MXZ-2DM Indication Symptom Abnormal point / Condition Condition Remedy LED1(Red) LED2(Yellow) Outdoor unit Refer to 11-6. "Check of LEV". The indoor unit detects an abnormality in the LEV and drain pump. Lighted Once LEV and drain pump does not Check the drain pump of the indoor unit.
- Page 30 Indication No. Symptom Abnormal point / Condition Condition Remedy LED1(Red) LED2(Yellow) Outdoor unit This symptom does not mean any abnormality of the operates. product, but check the following points. Cooling high-pressure Lighted 5 times The outdoor heat exchanger temperature exceeds 58°C during operation. Check if indoor filters are clogged.
- Page 31 MXZ-3DM Indication Remedy LED1(Red) LED2(Yellow) Outdoor unit Lighted Once does not Lighted Twice Outdoor power system Discharge temperature Lighted 3 times thermistor Fin temperature thermistor Lighted 4 times thermistor thermistor Outdoor heat exchanger circuit is detected in the thermistor 5 minutes (in cooling) and 10 temperature thermistor Lighted 5 times...
- Page 32 Indication Symptom Abnormal point / Condition Condition Remedy LED1(Red) LED2(Yellow) Outdoor unit The primary current exceeds 15 A. These symptoms do not mean any abnormality of the Primary current protection operates. product, but check the following points. Once Lighted Check the indoor filters are not clogged. The current of the compressor exceeds 12 A.
- Page 33 11-5. TROUBLE CRITERION OF MAIN PARTS MXZ-2DM40VA MXZ-3DM50VA Part name Check method and criterion Defrost thermistor (RT61) Measure the resistance with a tester. Fin temperature thermistor (RT64) Refer to 11-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2.
- Page 34 11-6. TROUBLESHOOTING FLOW • When outdoor unit does not operate, LED on outdoor P.C. board is not lighting. Check of power supply MXZ-2DM40VA Check the main power supply circuit for proper connections. Turn ON the breaker. Is there voltage of 230 VAC in the Check the power supply and correct them.
- Page 35 MXZ-3DM50VA Check the main power supply circuit for proper connections. Turn ON the breaker. Is there voltage of 230 VAC in the Check the power supply and correct them. power supply terminal block? Is the output voltage from the noise Replace the noise filter P.C.
- Page 36 Press the EMERGENCY does not indicate abnormal. electronic control replacing the indoor electronic OPERATION switch P.C. board. *1 control P.C. board. MXZ-2DM40VA once. Refer to indoor unit service manual. Outdoor display P.C. board LED1 LED2 Does the OPERATION Is there rated...
- Page 37 • In heating, the room does not get warm. • In cooling, the room does not get cool. How to check inverter/compressor Disconnect the connector (CNMC) between the inverter P.C. board/the outdoor control P.C. board and compressor, or disconnet the terminal of the compressor.
- Page 38 EMERGENCY OPERATION. Replace the inverter P.C. board, outdoor Does the unit operate 10 minutes or more without control P.C. board or the outdoor power showing thermistor abnormality? P.C. board. Normal MXZ-2DM40VA Thermistor Symbol Connector, Pin No. Board Defrost RT61 CN641 pin1 and pin2...
- Page 39 • In cooling, the heat exchanger of non-operating indoor unit has frosted. • In heating, non-operating indoor unit gets warm. Check of LEV MXZ-2DM40VA MXZ-3DM50VA CN724 Inverter P.C. board ― CN725 CN791 CN792 Outdoor control ― CN793 P.C. board CN795 Turn ON the breaker to the outdoor unit after checking LEV coil is mounted to the LEV body securely.
- Page 40 • Fan motor does not operate or stops operating shortly after starting the operation. Check of outdoor fan motor MXZ-2DM40VA Disconnect CN932 and measure the CN931 resistance of the outdoor fan motor. Inverter P.C. board CN932 Is the resistance of outdoor fan motor normal? (Refer to 11-5.)
- Page 41 MXZ-3DM50VA CN931 Outdoor control P.C. board Disconnect CN931 and measure the resistance of the outdoor fan motor. Is the resistance of outdoor fan motor Measuring points Resistance Replace the outdoor fan motor. normal? (Refer to right table) pin1 - pin4 pin5 - pin4 Does the outdoor fan motor rotate smoothly? Replace the outdoor fan motor.
- Page 42 The cooling operation or the heating operation does not operate. Check of R.V. coil MXZ-2DM40VA CN721 Inverter P.C. board 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning ON the breaker, start EMERGENCY OPERATION in HEAT mode.
- Page 43 MXZ-3DM50VA CN711 Outdoor control P.C. board CN712 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning ON the breaker, start EMERGENCY OPERATION in HEAT mode. Is there voltage 230 VAC Is there voltage of 230 VAC between pin1 Replace the noise filter P.C.
- Page 44 • When the operation frequency does not go up from lowest frequency. Check of HPS MXZ-3DM50VA CN681 Outdoor control P.C. board 1. Disconnect the connector CN681. 2. Check the resistance of HPS 1 minute after the outdoor unit breaker was turned OFF. Infinity Check the resistance between Replace HPS.
- Page 45 Check of bus-bar voltage MXZ-3DM50VA •Check the voltage of power supply. •Confi rm outdoor unit failure mode recall function. (Refer to 11-2.2.) Confi rm LED1 indication lamp on the outdoor control P.C. board. Blink 5 times Blink 6 times Lighting Replace the power P.C.
- Page 46 11-7. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MXZ-2DM40VA R.V. coil (CN721) FUSE (F901) 230 VAC T3.15AL250V (LD66A, LD70) Output to drive 250 - 325 VDC Smoothing capacitor FUSE (F801) FUSE (F701) outdoor fan (DB61(+), (-)) (C61, C62, C63) T3.15AL250V...
- Page 47 Defrost thermistor (RT61) 2. Outdoor control P.C. board Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) MXZ-3DM50VA Discharge temperature thermistor (RT62) 0 10 20 30 40 50 60 70 80 90 100 110 120 Temperature (°C) Temperature (°C) LED 3 LED 2 LED 1...
- Page 48 Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C. board) 5 VDC pulse wave (+)2-5(–): Zero cross signal 3-4 : Not used (+)6-5(–): 15V (+)7-5(–): 15V 4. Outdoor display P.C. board MXZ-2DM40VA To inverter P.C. board (CN936) LED1 LED2 OBH739A...
- Page 49 5. Noise filter P.C. board MXZ-3DM50VA CN903 CN904 CN901 To power To power To power P.C. board P.C. board P.C. board CN61 230 VAC Output 230 VAC Output FUSE T6.3AL250V CN62 To outdoor control P.C. board FUSE T2AL250V OBH739A...
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Page 50: Disassembly Instructions
Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 12-1. MXZ-2DM40VA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet and the panels Photo 1 Screws of the (1) Remove the screw fixing the service panel. - Page 51 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly and the inverter Photo 4 P.C. board (1) Remove the service panel, the top panel and the cabi- Screws of the heat sink Inverter net (Refer to 1). support and the separator assembly (2) Disconnect the power supply and indoor/outdoor con- necting wire and remove the back panel (Refer to 1).
- Page 52 OPERATING PROCEDURE PHOTOS 5. Removing the outdoor fan motor Ambient Photo 7 (1) Remove the service panel, the top panel and the cabi- temperature Outdoor heat net (Refer to 1). thermistor exchanger (2) Disconnect the power supply and indoor/outdoor con- (RT65) temperature necting wire.
- Page 53 12-2. MXZ-3DM50VA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet and the panels Photo 1 Screws of the (1) Remove the screws of the service panel, and remove top panel the service panel. (2) Remove the screws of the top panel, and remove the top panel.
- Page 54 OPERATING PROCEDURE PHOTOS Photo 4 2. Removing the outdoor control P.C. board, the outdoor power P.C. board and the noise filter P.C. board (1) Remove the service panel (Refer to 1). (2) Remove the top panel, the cabinet, and the back panel (Refer to 1).
- Page 55 OPERATING PROCEDURE PHOTOS Photo 8 5. Removing the compressor and the 4-way valve (1) Remove the service panel (Refer to 1). R.V. coil 4 way valve LEV coil E (2) Remove the top panel, the cabinet, and the back panel (Refer to 1). Expansion valve E (3) Recover gas from the refrigerant circuit.
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Page 56: Cooling
MXZ-2DM40VA COOLING Indoor units Cooling capacity (kW) Outdoor unit Current Power combination Unit A Unit B Total power consumption(kW) factor(%) 2.50 0.617 2.50 2.98 0.90 2.80 0.147 - 0.686 ) 3.15 0.830 3.15 4.01 0.90 3.15 0.147 - 0.830 ) 4.00... -
Page 57: Heating
MXZ-2DM40VA HEATING Indoor units Heating capacity (kW) Outdoor unit Current Power combination Unit A Unit B Total power consumption(kW) factor(%) 3.15 0.770 3.15 3.72 0.90 4.00 0.136 - 1.123 ) 3.60 0.939 3.60 4.54 0.90 4.30 0.131 - 1.235 ) 4.30... -
Page 58: Outdoor Unit
MXZ-3DM50VA COOLING Indoor units Cooling capacity (kW) Outdoor unit Current Power combination Unit A Unit B Unit C Total power consumption(kW) factor(%) 2.50 0.671 2.50 2.95 1.90 3.30 0.571 - 0.847 ) 3.15 0.838 3.15 3.68 2.00 4.30 0.585 - 1.204 ) 5.00 1.604 5.00... -
Page 59: Outdoor Unit
MXZ-3DM50VA HEATING Indoor units Heating capacity (kW) Outdoor unit Current Power combination Unit A Unit B Unit C Total power consumption(kW) factor(%) 3.15 0.956 3.15 4.20 3.15 4.50 0.956 - 1.238 ) 3.60 1.108 3.60 4.87 3.60 4.50 1.108 - 1.268 ) 5.40 1.462 5.40... - Page 60 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar. 2016. No.OBH739 REVISED EDITION-A New publication, effective Mar. 2016 Distributed in Dec. 2015. No.OBH739 Specifications are subject to change without notice. Made in Japan...