Mitsubishi Electric MXZ-2F33VF-E1 Service Manual
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Mitsubishi Electric MXZ-2F33VF-E1 Service Manual

Outdoor unit, hfc utilized, r32
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OUTDOOR UNIT

SERVICE MANUAL

Models
MXZ-2F33VF
MXZ-2F42VF
MXZ-2F53VF
MXZ-2F53VFH
MXZ-3F54VF
MXZ-3F68VF
MXZ-4F72VF
MXZ-2F33VF
MXZ-2F42VF
MXZ-2F53VF
NOTE:
RoHS compliant products have <G> mark
on the spec name plate.
-
E1
ET1
,
-
E1
ET1
,
-
E1
ET1
,
-
E1
-
E1
ET1
,
-
E1
ET1
,
-
E1
ET1
,
MXZ-2F53VFH
HFC
utilized
R32
Indoor unit service manual
MSZ-LN•VG Series (OBH766)
MSZ-EF•VG Series (OBH589)
MSZ-AP•VF Series (OBH799)
MSZ-AP•VG Series (OBH788)
MLZ-KP•VF Series (OBH801)
SLZ-M•FA Series
SEZ-M•DA Series
PCA-M•KA Series (OCH659)
PEAD-M•JA(L) Series (HWE16130)
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. SAFETY PRECAUTION ···································· 3
3. PART NAMES AND FUNCTIONS ··················· 13
4. SPECIFICATION ·············································· 14
5. NOISE CRITERIA CURVES ···························· 20
6. OUTLINES AND DIMENSIONS ······················ 22
7. WIRING DIAGRAM ·········································· 25
8. REFRIGERANT SYSTEM DIAGRAM ············· 29
9. PERFORMANCE CURVES ····························· 35
10. ACTUATOR CONTROL ··································· 56
11. SERVICE FUNCTIONS ···································· 57
12. TROUBLESHOOTING ····································· 61
13. DISASSEMBLY INSTRUCTIONS ···················· 86
PARTS CATALOG (OBB790)
No. OBH790

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Summary of Contents for Mitsubishi Electric MXZ-2F33VF-E1

  • Page 1: Outdoor Unit

    OUTDOOR UNIT No. OBH790 utilized SERVICE MANUAL Models MXZ-2F33VF Indoor unit service manual MXZ-2F42VF MSZ-LN•VG Series (OBH766) MSZ-EF•VG Series (OBH589) MXZ-2F53VF MSZ-AP•VF Series (OBH799) MSZ-AP•VG Series (OBH788) MXZ-2F53VFH MLZ-KP•VF Series (OBH801) SLZ-M•FA Series MXZ-3F54VF SEZ-M•DA Series PCA-M•KA Series (OCH659) MXZ-3F68VF PEAD-M•JA(L) Series (HWE16130) MXZ-4F72VF CONTENTS...
  • Page 2 Use the specifi ed refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.

  • Page 3: Technical Changes

    TECHNICAL CHANGES MXZ-2F33VF - MXZ-2F42VF - MXZ-2F53VF - MXZ-2F53VFH - MXZ-3F54VF - MXZ-3F68VF - MXZ-4F72VF - 1. New model SAFETY PRECAUTION MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of outdoor unit. WARNING Read the OPERATION MANUAL carefully before operation.
  • Page 4 Use the following tools specifically designed for Make sure that the inside and outside of refrige- use with R32 refrigerant. rant piping is clean and it has no contaminants such as sulfur, oxides, dirt, shaving particles, etc, The following tools are necessary to use R32 refrigerant. which are hazard to refrigerant cycle.
  • Page 5 [1] Warning for service (1) Do not alter the unit. (2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe components specifically made for use with refrigerant specified in the outdoor unit installation manual. (3) Ask a dealer or an authorized technician to install, relocate and repair the unit.
  • Page 6 [4] Cautions for unit using R32 refrigerant Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful attention to the following points. (1) Information on servicing (1-1) Checks on the Area Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minimized.
  • Page 7 (3) Repair to intrinsically Safe Components Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use. Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmos- phere.
  • Page 8 b) Isolate system electrically. c) Before attempting the procedure, ensure that: • mechanical handling equipment is available, if required, for handling refrigerant cylinders; • all personal protective equipment is available and being used correctly; • the recovery process is supervised at all times by a competent person; •...
  • Page 9 [5] Service tools Use the below service tools as exclusive tools for R32 refrigerant. Tool name Specifications Gauge manifold · Only for R32 · Use the existing fitting specifications . (UNF1/2) · Use high-tension side pressure of 5.3MPa·G or over. Charge hose ·...
  • Page 10 (2) Cautions for refrigerant piping work New refrigerant R32 is adopted for replacement inverter series. Although the refrigerant piping work for R32 is same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R32 is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.
  • Page 11 2-4. CHOOSING THE OUTDOOR UNIT INSTALLATION LOCATION R32 is heavier than air—as well as other refrigerants— so tends to accumulate at the base (in the vicinity of the floor). If R32 accumulates around base, it may reach a flammable concentration in case room is small. To avoid ignition, maintaining a safe work environment is required by ensuring appropriate ventilation.
  • Page 12 C) Create an appropriate ventilation open area. Make sure that the width of the open area is 0.9 [m] or more and the height of the open area is 0.15 [m] or more. However, the height from the bottom of the installation space to the bottom edge of the open area should be 0.125 [m] or less.

  • Page 13: Part Names And Functions

    PART NAMES AND FUNCTIONS MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH Air inlet (Back and side) Piping Drain hose Air outlet Drain outlet MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF Air inlet (Back and side) Air outlet Drain outlet ACCESSORIES MXZ-2F33VF MXZ-3F54VF Model MXZ-2F42VF MXZ-3F68VF MXZ-2F53VF MXZ-4F72VF Drain socket Drain cap OBH790...

  • Page 14: Specification

    SPECIFICATION Outdoor model MXZ-2F33VF Single phase Outdoor unit power supply 220 - 230 - 240 V, 50 Hz Indoor units number Piping total length Max. 20 Connecting pipe length Max. 15 Height difference (Indoor ~ Outdoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM.
  • Page 15 Outdoor model MXZ-2F42VF Single phase Outdoor unit power supply 220 - 230 - 240 V, 50 Hz Indoor units number Piping total length Max. 30 Connecting pipe length Max. 20 Height difference (Indoor ~ Outdoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM.
  • Page 16 Outdoor model MXZ-2F53VF MXZ-2F53VFH Single phase Outdoor unit power supply 220 - 230 - 240 V, 50 Hz Indoor units number Piping total length Max. 30 Connecting pipe length Max. 20 Height difference (Indoor ~ Outdoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM.
  • Page 17 Outdoor model MXZ-3F54VF Single phase Outdoor unit power supply 220 - 230 - 240 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 8 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM.
  • Page 18 Outdoor model MXZ-3F68VF Single phase Outdoor unit power supply 220 - 230 - 240 V, 50 Hz Indoor units number 2 to 3 Piping total length Max. 60 Connecting pipe length Max. 25 Height difference (Indoor ~ Outdoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM.
  • Page 19 Outdoor model MXZ-4F72VF Single phase Outdoor unit power supply 220 - 230 - 240 V, 50 Hz Indoor units number 2 to 4 Piping total length Max. 60 Connecting pipe length Max. 25 Height difference (Indoor ~ Outdoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM. Height difference (Indoor ~ Indoor) Refer to 8 REFRIGERANT SYSTEM DIAGRAM.

  • Page 20: Noise Criteria Curves

    NOISE CRITERIA CURVES MXZ-2F33VF MXZ-2F42VF 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 HEARING FOR NC-20 HEARING FOR NC-20...

  • Page 21: Table Of Contents

    MXZ-3F54VF MXZ-3F68VF 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 HEARING FOR NC-20 HEARING FOR NC-20 CONTINUOUS CONTINUOUS...

  • Page 22: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH Unit: mm OBH790...
  • Page 23 MXZ-3F54VF MXZ-3F68VF Unit: mm 1.Installation space Note : Leave front and both sides 100 or more free of obstruction. 2.Service space Note : Leave front and overhead free of obstruction. 100 or more 100 or more 350 or more Service space 350 or more 350 or more Note : Leave rear, overhead and...
  • Page 24 MXZ-4F72VF Unit: mm 1.Installation space Note : Leave front and both sides 100 or more free of obstruction. 2.Service space Note : Leave front and overhead free of obstruction. 100 or more 100 or more 350 or more Service space 350 or more 350 or more Note : Leave rear, overhead and...

  • Page 25: Wiring Diagram

    WIRING DIAGRAM MXZ-2F33VF - MXZ-2F42VF - MXZ-2F53VF - OBH790...
  • Page 26 MXZ-2F53VFH - OBH790...
  • Page 27 MXZ-3F54VF - MXZ-3F68VF - OBH790...
  • Page 28 MXZ-4F72VF - OBH790...

  • Page 29: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MXZ-2F33VF UNIT: mm Compressor Discharge R.V. coil 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 exchanger Stop valve temperature (with service port) thermistor...

  • Page 30: Heating

    MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH UNIT: mm Compressor Discharge R.V. coil 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) temperature thermistor RT68 FAN-OUT...

  • Page 31: Max Refrigerant Piping Length

    MXZ-3F54VF UNIT: mm Compressor High-pressure switch Discharge R.V. coil temperature Charge pipe Refrigerant flow in cooling thermistor RT62 Oil separator Refrigerant flow in heating 4-way Capillary tube valve Indoor unit Stop valve with service port Indoor unit Outdoor heat Muffler exchanger Indoor unit temperature...
  • Page 32 MXZ-3F68VF UNIT: mm Compressor High-pressure switch Discharge R.V. coil temperature Charge pipe Refrigerant flow in cooling thermistor RT62 Oil separator Refrigerant flow in heating 4-way Capillary tube valve Indoor unit Stop valve with service port Indoor unit Outdoor heat Muffler Indoor unit exchanger temperature...
  • Page 33 MXZ-4F72VF UNIT: mm Compressor High-pressure switch Discharge R.V. coil temperature Charge pipe Refrigerant flow in cooling thermistor RT62 Refrigerant flow in heating Oil separator 4-way Indoor unit Capillary tube valve Stop valve with service port Indoor unit Indoor unit Outdoor heat Muffler exchanger temperature...

  • Page 34: Pumping Down

    Method of Charging refrigerant MXZ-3F54VF/3F68VF/4F72VF Indoor unit Connection Piping Total Pre charge refrigerant *3 number *1 of speci c I/U *2 length 1.4 kg 0.0 kg MXZ-2F42VF/2F53VF/2F53VFH Piping Total Pre charge refrigerant length 1.2 kg 1.2 kg 0.0 kg MXZ-2F33VF Piping Total Pre charge...

  • Page 35: Performance Curves

    PERFORMANCE CURVES MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF 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 36 9-1. CAPACITY AND THE INPUT CURVES MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH Cooling capacity Total input (Cooling) 11.1 12.8 10.2 11.6 10.5 26 24 20 25 35 40 20 25 35 40 Outdoor intake air Dry - bulb temperature (ºC) Outdoor intake air Dry - bulb temperature (ºC) Heating capacity Total input (Heating) 17.6...
  • Page 37 MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF Cooling capacity 11.1 12.8 10.2 11.6 10.5 45 46 Outdoor intake air Dry - bulb temperature ( ºC Total input (Cooling) 45 46 Outdoor intake air Dry - bulb temperature ( ºC Heating capacity 30.9 17.6 19.5 21.2 19.5 21.3...
  • Page 38 9-2. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY (single operation) MXZ-2F33VF 15-class unit <HEAT>Total input <COOL>Total input <HEAT>Capacity <COOL>Capacity Frequency Frequency Frequency Frequency 18-class unit <HEAT>Capacity <HEAT>Total input <COOL>Total input <COOL>Capacity Frequency Frequency Frequency Frequency 20-class unit <HEAT>Capacity <HEAT>Total input <COOL>Total input <COOL>Capacity Frequency...
  • Page 39 MXZ-2F42VF 15-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 18-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 20-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 22-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity...
  • Page 40 MXZ-2F42VF 35-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency MXZ-2F53VF MXZ-2F53VFH 15-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 18-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 20-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity...
  • Page 41 MXZ-2F53VF MXZ-2F53VFH 25-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 35-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 42-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 50-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity...
  • Page 42 MXZ-3F54VF 15-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 18-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 20-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 22-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity...
  • Page 43 MXZ-3F54VF 25-class unit <COOL>Capacity <COOL>Total input <HEAT>Capacity <HEAT>Total input Frequency Frequency Frequency Frequency 35-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 42-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 50-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity...
  • Page 44 MXZ-3F68VF 15-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 18-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 20-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 22-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity...
  • Page 45 MXZ-3F68VF 35-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 42-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 50-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 60-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity...
  • Page 46 MXZ-4F72VF 15-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 18-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 20-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 22-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity...
  • Page 47 MXZ-4F72VF 35-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 42-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 50-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity Frequency Frequency Frequency Frequency 60-class unit <COOL>Total input <HEAT>Total input <COOL>Capacity <HEAT>Capacity...
  • Page 48 9-3. HOW TO OPERATE FIXED-FREQUENCY OPERATION <Test run operation> 1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL : Press once, HEAT : Press twice). 2. Test run operation starts and continues to operate for 30 minutes. 3.
  • Page 49 MXZ-2F42VF 15-class unit 18-class unit (MPa[Gauge]) (MPa[Gauge]) 30Hz 30Hz 30Hz 30Hz (°C) (°C) (°C) (°C) Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) Ambient humidity (%) Ambient humidity (%) Ambient humidity (%) Ambient humidity (%) 20-class unit 22-class unit...
  • Page 50 MXZ-2F53VF MXZ-2F53VFH 15-class unit 18-class unit (MPa[Gauge]) (MPa[Gauge]) 30Hz 30Hz 30Hz 30Hz (°C) (°C) (°C) (°C) Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) Ambient humidity (%) Ambient humidity (%) Ambient humidity (%) Ambient humidity (%) 20-class unit 22-class unit...
  • Page 51 MXZ-3F54VF 15-class unit 18-class unit (MPa[Gauge]) (MPa[Gauge]) 40Hz 40Hz 40Hz 40Hz (°C) (°C) (°C) (°C) Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) Ambient humidity (%) Ambient humidity (%) Ambient humidity (%) Ambient humidity (%) 20-class unit 22-class unit...
  • Page 52 MXZ-3F68VF MXZ-4F72VF 15-class unit 18-class unit (MPa[Gauge]) (MPa[Gauge]) 30Hz 30Hz 30Hz 30Hz (°C) (°C) (°C) (°C) Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) Ambient humidity (%) Ambient humidity (%) Ambient humidity (%) Ambient humidity (%) 22-class unit 20-class unit...
  • Page 53 MXZ-3F68VF MXZ-4F72VF 60-class unit (MPa[Gauge]) 30Hz 30Hz Ambient temperature ( ) Ambient temperature ( ) Ambient humidity (%) Ambient humidity (%) (2) HEAT operation Condition : Indoor Outdoor Dry bulb temperature (°C) 20.0 20.0 Wet bulb temperature (°C) 14.5 14.5 Operation : TEST RUN OPERATION (Refer to 9-3.) MXZ-2F33VF 15-class unit...
  • Page 54 MXZ-2F42VF 15-class unit 18-class unit 20-class unit 22-class unit 34Hz 34Hz 34Hz 34Hz Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) 25-class unit 35-class unit 34Hz 34Hz Ambient temperature ( ) Ambient temperature ( ) MXZ-2F53VF MXZ-2F53VFH 15-class unit 18-class unit...
  • Page 55 MXZ-3F54VF 18-class unit 20-class unit 15-class unit 22-class unit 48Hz 48Hz 48Hz 48Hz Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) Ambient temperature ( ) 35-class unit 42-class unit 25-class unit 50-class unit 48Hz 48Hz 48Hz 48Hz Ambient temperature ( ) Ambient temperature ( )

  • Page 56: Actuator Control

    ACTUATOR CONTROL MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH Relation between main sensor and actuator Actuator Sensor Purpose Outdoor Defrost Compressor R.V. coil fan motor heater 1 Discharge temperature thermistor Protection Cooling: Coil frost prevention Indoor coil temperature thermistor Heating: High pressure protection Defrost thermistor Heating: Defrosting Fin temperature thermistor...

  • Page 57: Service Functions

    SERVICE FUNCTIONS MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF 11-1. THE POSITION OF SWITCH <MXZ-2F33VF/2F42VF/2F53VF/2F53VFH> 1 2 3 4 5 6 Outdoor display P.C. board <MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF> SW871 CN750 1 2 3 4 5 6 CN751 1 2 3 4 5 6 Outdoor control P.C.
  • Page 58 11-3. HOW TO SET LOW STANDBY POWER MODE MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF • Before turning on the power supply, settings for dip switch (SW1) and jumper connector (SC751) are necessary on the outdoor controller board. • When connecting the ducted type indoor unit, deactivate low standby power mode. To activate low standby power mode: Connect SC751 to CN750.
  • Page 59 11-5. AUTOMATIC LINE CORRECTING <MXZ-2F33VF/2F42VF/2F53VF/2F53VFH> This outdoor unit has an automatic line correcting function which automatically detects and corrects improper wiring or piping. <MXZ-2F33VF/2F42VF/2F53VF/2F53VFH> Improper wiring or piping can be automatically detected when one indoor unit is operated in COOL mode for 30 minutes. When improper wiring or piping is detected, wiring lines are corrected (A to B/ B to A) with the software.
  • Page 60 <MXZ-3F54VF/3F68VF/4F72VF> Outdoor unit has an auto line correcting function which automatically detects and corrects improper wiring or piping. Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871). When improper wiring or piping is detected, wiring lines are corrected. This will be completed in about 10 to 15 minutes.

  • Page 61: Troubleshooting

    TROUBLESHOOTING MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF 12-1. 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...
  • Page 62 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 63 NOTE: Blinking patterns of this mode differ from the ones of 3. Table of outdoor unit failure mode recall function Troubleshooting check table (12-4). MXZ-2F Upper or LED indication Indoor/ left lamp of (Outdoor P.C. board) outdoor OPERATION Abnormal point unit failure LED 1 LED 2...
  • Page 64 NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (12-4.). MXZ-3F, 4F LED indication The left lamp of Indoor/ (Outdoor P.C. OPERATION IN- Abnormal point outdoor unit Condition Remedy board) DICATOR lamp (Failure mode/protection) failure mode (Indoor unit) recall function LED1...
  • Page 65 12-3. INSTRUCTION OF TROUBLESHOOTING • Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor unit. Then, check the outdoor unit with referring to this page. Operation start Check the outdoor unit LED indicator.
  • Page 66 12-4. TROUBLESHOOTING CHECK TABLE MXZ-2F Symptom Indication Abnormal point / Condition Condition Remedy LED1(Red) LED2(Yellow) Outdoor unit Refer to 12-6. "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 67 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 5 times Lighted The outdoor heat exchanger temperature exceeds 58°C during operation. Check if indoor filters are clogged.
  • Page 68 MXZ-3F, 4F Indication Abnormal point / Con- Symptom Condition Remedy dition LED1(Red) LED2(Yellow) Outdoor The indoor unit detects an abnormality in the LEV • Refer to 12-6. "Check of LEV". Lighted Once LEV and drain pump unit does and drain pump. •...
  • Page 69 Indication Abnormal point / Con- Symptom Condition Remedy dition LED1(Red) LED2(Yellow) 22 'Outdoor unit A failure occurs 3 consecutive times within 30 13 times Not lighted Outdoor fan motor • Refer to 12-6. "Check of outdoor fan motor". stops and seconds after the fan gets started.
  • Page 70 12-5. TROUBLE CRITERION OF MAIN PARTS MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF Part name Check method and criterion Defrost thermistor (RT61) Measure the resistance with a tester. Fin temperature thermistor (RT64) Refer to 12-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2. "Outdoor control P.C.
  • Page 71 12-6. TROUBLESHOOTING FLOW Outdoor unit does not operate. Check of power supply MXZ-2F33VF/2F42VF/2F53VF/2F53VFH Check the main power supply circuit for proper connections. Turn ON the power supply. Is there voltage of 220 - 230 - 240 V AC Check the power supply and correct them. in the power supply terminal block? Is there voltage of 220 - 230 - 240 V AC Replace the inverter P.C.
  • Page 72 • When the indoor unit does not operate, it cannot be operated either with the remote controller or with the EMERGENCY OPERATION switch. • When the outdoor unit does not operate, the OPERATION INDICATOR lamp on the indoor unit flashes ON and OFF every 0.5-second.
  • Page 73 MXZ-3F54VF/3F68VF/4F72VF LED indication Turn OFF the power supply. for communication status Communication status is indicated Is there rated voltage in by the LED. Check the power the power supply? supply. Unit status Blinking: normal communication Lighting: abnormal communication or not connected Turn ON the power supply.
  • Page 74 The cooling operation or heating operation does not operate. Check of R.V. coil Connector MXZ-2F MXZ-2F33VF/2F42VF/2F53VF/2F53VFH CN721 Inverter P.C. board 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning ON the power supply, start EMERGENCY OPERATION in HEAT mode.
  • Page 75 MXZ-3F54VF/3F68VF/4F72VF Connector MXZ-3F, 4F CNAC Outdoor control CN712 P.C. board 1. Disconnect the lead wire leading to the compressor. Outdoor power 2. 3 minutes after turning ON the power supply, start EMERGENCY CNAC2 P.C. board OPERATION in COOL mode. Is there voltage 220 - 230 - 240 V AC Replace the outdoor Is there voltage of 220 - 230 - 240 V AC between the pin1 and pin3 at...
  • Page 76 • When cooling, heat exchanger of non-operating indoor unit frosts. • When heating, non-operating indoor unit gets warm. Check of LEV Connector MXZ-2F MXZ-3F/4F CN724 Inverter P.C. board CN725 CN791 Outdoor control CN792 P.C. board CN793 ― Turn ON the power supply to the outdoor unit after checking LEV CN794 coil is mounted to the LEV body securely.
  • Page 77 • When heating, room does not get warm. • When cooling, room does not get cool. How to check inverter/compressor Disconnect the terminal of the compressor or the connector (CNMC) between the compressor and the outdoor power P.C. board. 3 minutes after the power supply is turned ON, start EMERGENCY OPERATION.
  • Page 78 • When thermistor is abnormal. Check of outdoor thermistors Disconnect the connector in the following table and Replace the thermistor except RT64. Abnormal measure the resistance of the thermistor to check If RT64 is abnormal, replace the outdoor power whether the thermistor is normal or not. (Refer to 12-7.) P.C.
  • Page 79 • Fan motor does not operate or stops operating shortly after starting the operation. Check of outdoor fan motor MXZ-2F33VF/2F42VF/2F53VF/2F53VFH Connector MXZ-2F CN931 Disconnect CN932 and measure the Inverter P.C. board CN932 resistance of the outdoor fan motor. Is the resistance of outdoor fan motor normal? (Refer to 12-5.) Turn ON the breaker.
  • Page 80 MXZ-3F54VF/3F68VF/4F72VF Disconnect CNF1 and measure the Connector MXZ-3F, 4F resistance of the outdoor fan motor. Outdoor control CNF1 P.C. board 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?
  • Page 81 • When the operation frequency does not go up from the lowest frequency. Connector MXZ-3F, 4F Check of HPS Outdoor control CN63H P.C. board MXZ-3F54VF/3F68VF/4F72VF 1. Disconnect the connector CN63H in the outdoor control P.C. board. 2. Check the resistance of HPS after 1 minute has passed since the outdoor unit power supply was turned OFF. Infinity Replace HPS.
  • Page 82 Check of outdoor refrigerant circuit MXZ-2F33VF/2F42VF/2F53VF/2F53VFH The unit occasionally stops when the Was the operation started with Has the operation stopped stop valve is opened or closed during the stop valve closed, and was during pump down? operation. Open the stop valve and it opened during operation? start the cooling operation again.
  • Page 83 12-7. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MXZ-2F33VF MXZ-2F42VF MXZ-2F53VF MXZ-2F53VFH Back side of unit R.V. coil (CN721) Heater (CN722) MXZ-2F53VFH 220-230-240 V AC 280 - 370 V DC FUSE (F901) Smoothing capacitor FUSE (F801) (LD66A, LD70) (DB61(+), (-)) T3.15AL250V (C61, C62, C63)
  • Page 84 Defrost thermistor (RT61) Ambient temperature thermistor (RT65) 2. Outdoor control P.C. board Outdoor heat exchanger temperature thermistor (RT68) MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF Serial signal 12 ~ 24 V Room B Room D 220 - 230 - 240 V AC Room A Room C Input CN741...
  • Page 85 3. Outdoor power P.C. board MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF Output to drive compressor CN171 Fin temperature thermistor CN152 (RT64) Signal Transmission (From Outdoor Control P.C. board) 5 V DC pulse wave Connect to earth CNAC2 220-230-240 V AC Output F1 FUSE T6.3AL250V 220-230-240 V AC Input...

  • Page 86: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with locking mechanism> The terminal which has the locking mechanism can be detached as shown below. There are following 2 types of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching.
  • Page 87 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly and the inverter Photo 4 P.C. board Screws of the heat sink (1) Remove the service panel, the top panel and the cabinet Inverter support and the separator (Refer to 1). assembly (2) Disconnect the power supply and indoor/outdoor connect- ing wire and remove the back panel (Refer to section1).
  • Page 88 OPERATING PROCEDURE PHOTOS 5. Removing the outdoor fan motor Photo 7 (1) Remove the service panel, the top panel and the cabinet Outdoor heat (Refer to section1). exchanger (2) Disconnect the power supply and indoor/outdoor connect- temperature ing wire. thermistor (RT68) (3) Disconnect the connectors for outdoor fan motor.
  • Page 89 13-2. MXZ-3F54VF MXZ-3F68VF MXZ-4F72VF NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet and the panels Photo 1 (1) Remove the screws of the service panel, and remove the service panel. Screws of the (2) Disconnect the power supply and indoor/outdoor connect- top panel ing wire.
  • Page 90 OPERATING PROCEDURE PHOTOS Photo 4 2. Removing the outdoor control P.C. board, the out- door power P.C. board and the reactor Electrical (1) Remove the service panel (Photo 1). Catch of the electrical box assembly box assembly (2) Disconnect the power supply and indoor/outdoor con- necting wire.
  • Page 91 OPERATING PROCEDURE PHOTOS . Removing the fan motor Photo 8 Screws of the outdoor fan motor (1) Remove the service panel (Photo 1). (2) Disconnect the power supply and indoor/outdoor connect- ing wire. (3) Remove the top panel, the cabinet, and the back panel (Photo 1, 2, 3).
  • Page 92 OPERATING PROCEDURE PHOTOS Photo 11 5. Removing the expansion valve (1) Remove the service panel (Photo 1). (2) Remove the top panel, the cabinet, and the back panel (Photo 1, 2, 3). (Gas recovery is not required if the unit is pumped down.) 4-way valve (3) Remove the electrical parts for removing LEV R (Photo 4, 8).
  • Page 93 OBH790...
  • Page 94 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Published: Mar. 2018. No.OBH790 Made in Japan Specifications are subject to change without notice.

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