Mitsubishi Electric MXZ-8C48NA2-U1 Technical & Service Manual
  1. Manuals
  2. Brands
  3. Mitsubishi Electric Manuals
  4. Air Conditioner
  5. MXZ-8C48NA2-U1
  6. Technical & service manual
Mitsubishi Electric MXZ-8C48NA2-U1 Technical & Service Manual

Mitsubishi Electric MXZ-8C48NA2-U1 Technical & Service Manual

Split-type, heat pump air conditioners, outdoor unit, branch box
Hide thumbs
Table of Contents

Advertisement

Quick Links

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
[Model Name]
<Outdoor unit>
MXZ-8C48NA2
MXZ-8C60NA2
MXZ-4C36NAHZ2
MXZ-5C42NAHZ2
MXZ-8C48NAHZ2
<Branch box>
PAC-MKA52BC
PAC-MKA32BC
PAC-MKA53BC
PAC-MKA33BC
OUTDOOR UNIT: MXZ-4C36NAHZ2-U1
BRANCH BOX: PAC-MKA52BC
[Service Ref.]
MXZ-8C48NA2-U1
MXZ-8C60NA2-U1
MXZ-4C36NAHZ2-U1
MXZ-5C42NAHZ2-U1
MXZ-8C48NAHZ2-U1
PAC-MKA52BC
PAC-MKA32BC
PAC-MKA53BC
PAC-MKA33BC
Model name
indication
CONTENTS
1. SAFETY PRECAUTION .................................... 2
2. OVERVIEW OF UNITS ...................................... 5
3. SPECIFICATIONS ............................................. 9
4. DATA ................................................................ 13
5. OUTLINES AND DIMENSIONS ...................... 35
6. WIRING DIAGRAM ......................................... 37
8. TROUBLESHOOTING .................................... 47
10. DISASSEMBLY PROCEDURE ...................... 140
11. REMOTE CONTROLLER ............................. 161
PARTS CATALOG (OCB730)
HFC
utilized
R410A
November 2024
No. OCH730
REVISED EDITION-C
Revision:
• "2-1. SYSTEM
CONSTRUCTION"
has been revised in
REVISED EDITION-C.
OCH730B is void.
Notes:
• This service manual
describes technical
data of outdoor unit
and branch box.
As for indoor units,
refer to its service
manual.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MXZ-8C48NA2-U1 and is the answer not in the manual?

Questions and answers

Related Manuals for Mitsubishi Electric MXZ-8C48NA2-U1

Summary of Contents for Mitsubishi Electric MXZ-8C48NA2-U1

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS November 2024 No. OCH730 REVISED EDITION-C TECHNICAL & SERVICE MANUAL [Model Name] [Service Ref.] Revision: <Outdoor unit> • "2-1. SYSTEM MXZ-8C48NA2-U1 MXZ-8C48NA2 CONSTRUCTION" has been revised in MXZ-8C60NA2-U1 MXZ-8C60NA2 REVISED EDITION-C. MXZ-4C36NAHZ2-U1 MXZ-4C36NAHZ2 OCH730B is void.

  • Page 2: Safety Precaution

    SAFETY PRECAUTION 1-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuit must be disconnected. Precautions during the repair service Preparation before the repair service • Do not perform the work involving the electric parts • Prepare the proper tools. with wet hands.

  • Page 3: Cautions For Service

    Charge refrigerant from liquid phase of gas Do not use a charging cylinder. cylinder. If a charging cylinder is used, the composition of refrigera- If the refrigerant is charged from gas phase, composition nt will change and the efficiency will be lowered. change may occur in refrigerant and the efficiency will be lowered.
  • Page 4 1-3. Cautions for refrigerant piping work New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is the same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the work- ing pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.

  • Page 5: Overview Of Units

    OVERVIEW OF UNITS 2-1. SYSTEM CONSTRUCTION Outdoor unit MXZ-8C48NAHZ2-U1 MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 MXZ-8C60NA2-U1 MXZ-8C48NA2-U1 4.5HP Rated capacity Cooling (kBtu/h) Heating Refrigerant R410A Connectable Capacity class Type 06 to Type 36 indoor unit Caution: The indoor unit which rated capacity exceeds 36 kBtu/ h (Type 36) can NOT be connected.

  • Page 6: System Outline

    2-2. SYSTEM OUTLINE The additional connection of the branch box together with employment of the compact trunk-looking outdoor unit can suc- cessfully realize a long distance piping for large houses. Equipped with a microprocessor, the branch box can translate the transmission signal of indoor units to achieve the optimum control.
  • Page 7 2-3. TYPICAL COMBINATION EXAMPLE Branch box is located INSIDE of condominium Branch box (Inside) Installing branch box indoors Only 1 piping is required between the outdoor and indoor offering a fine external view. ■ System example of 5 indoor units Branch box (5-branches type) Master Dining...
  • Page 8 2-4. SIMPLIFIED PIPING SYSTEM Pipe size (Fig. 2-1) Piping connection size Liquid pipe Gas pipe ■ 4C36 In the case of using 1-branch box 5C42 5/8 (ø15.88) Flare connection employed. (No brazing) 3/8 (ø9.52) 8C48 Branch box 8C60 3/4 (ø19.05) 4C36/5C42/8C48 •...

  • Page 9: Specifications

    SPECIFICATIONS 3-1. OUTDOOR UNIT Service Ref. MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 Indoor type Non-Ducted Ducted Non-Ducted Ducted Capacity Rated * Btu/h 36,000 36,000 36,000 42,000 42,000 42,000 Rated power consumption * 2,570 2,730 2,880 3,130 3,470 3,890 Btu/h/W 14.00 13.20 12.50 13.40 12.10 10.80 SEER 20.0...
  • Page 10 Service Ref. MXZ-8C48NAHZ2-U1 MXZ-8C48NA2-U1 Indoor type Non-Ducted Ducted Non-Ducted Ducted Capacity Rated * Btu/h 48,000 48,000 48,000 48,000 48,000 48,000 Rated power consumption * 3,930 4,320 4,800 3,930 4,320 4,800 Btu/h/W 12.20 11.10 10.00 12.20 11.10 10.00 SEER 20.0 18.0 16.0...
  • Page 11 Service Ref. MXZ-8C60NA2-U1 Indoor type Non-Ducted Ducted Capacity Rated * Btu/h 60,000 60,000 60,000 Rated power consumption * 4,800 5,360 6,000 Btu/h/W 12.50 11.20 10.00 SEER 19.5 18.2 17.0 Capacity Rated 47°F * Btu/h 66,000 66,000 66,000 Capacity Max. 17°F * Btu/h 65,000 65,000...

  • Page 12: Branch Box

    3-2. BRANCH BOX Model name PAC-MKA52BC PAC-MKA32BC Connectable number of indoor units Maximum 5 Maximum 3 Power supply Single phase, 208/230 V, 60 Hz Input 0.003 Running current 0.05 External finish Galvanized sheets Dimensions in (mm) Width 17-23/32 (450) in (mm) Depth 11-1/32 (280) Height...

  • Page 13: Data

    DATA 4-1. SELECTION OF COOLING/HEATING UNITS How to determine the capacity when less than or equal 100% indoor model size units are connected in total: The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended only for reference. Determine the load (L) and the Indoor/Outdoor Temperature Temporarily select the indoor/outdoor Units...
  • Page 14 How to determine the capacity when greater than 100% indoor model size units are connected in total: The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended only for reference. Determine the load (L) and the indoor/outdoor Temperature Temporarily select the indoor/outdoor units...
  • Page 15 <Cooling> Design Condition Outdoor Design Dry Bulb Temperature 98.6ºF (37.0ºC) Total Cooling Load 29.6 kBtu/h Room1 Indoor Design Dry Bulb Temperature 80.6ºF (27.0ºC) Indoor Design Wet Bulb Temperature 68.0ºF (20.0ºC) Cooling Load 13.6 kBtu/h Room2 75.2ºF (24.0ºC) Indoor Design Dry Bulb Temperature Indoor Design Wet Bulb Temperature 66.2ºF (19.0ºC) Cooling Load...
  • Page 16 <Heating> Design Condition Outdoor Design Wet Bulb Temperature 23.0ºF (-5.0ºC) Total Heating Load 34.0 kBtu/h Room1 69.8ºF (21.0ºC) Indoor Design Dry Bulb Temperature 16.3 kBtu/h Heating Load Room2 73.4ºF (23.0ºC) Indoor Design Dry Bulb Temperature Heating Load 17.7 kBtu/h <Other> Indoor/Outdoor Equivalent Piping Length 230 ft Rated capacity of indoor unit [kBtu/h] Model...
  • Page 17 3. Power input of outdoor unit Outdoor unit: MXZ-4C36 Indoor unit 1: MSZ-FH15 Indoor unit 2: MSZ-FH18 <Cooling> (1) Rated power input of outdoor unit 2.57 kW (2) Calculation of the average indoor temperature power input coefficient (Cave) Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp. 98.6°F [37.0°C] D.B., Indoor temp. 68.0°F [20.0°C] W.B.) 1.04 (Refer to “4-2.
  • Page 18 <Heating> (1) Rated power input of outdoor unit 3.34 kW (2) Calculation of the average indoor temperature power input coefficient Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp. 23.0°F [−5.0°C] W.B., Indoor temp. 69.8°F [21.0°C] D.B.) 1.10 (Refer to “4-2. CORRECTION BY TEMPERATURE”.) Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp.

  • Page 19: Correction By Temperature

    4-2. CORRECTION BY TEMPERATURE The outdoor units have varied capacity at different designing temperature. Using the nominal cooling/heating capacity value and the ratio below, the capacity can be observed at various temperature. <Cooling> Figure 7 Indoor unit temperature correction To be used to correct indoor unit capacity only 60.8 62.6 64.4...
  • Page 20 <Heating> For MXZ-8C48NA2-U1, MXZ-8C60NA2-U1 Figure 9 Indoor unit temperature correction To be used to correct indoor unit capacity only 60.8 62.6 64.4 66.2 69.8 71.6 73.4 75.2 78.8 80.6 [°F D.B.] [°C D.B.] Indoor Temperature Figure 10 Outdoor unit temperature correction...
  • Page 21 <Heating> For MXZ-4C36NAHZ2-U1,MXZ-5C42NAHZ2-U1,MXZ-8C48NAHZ2-U1 Figure 11 Indoor unit temperature correction To be used to correct indoor unit capacity only 60.8 62.6 64.4 66.2 69.8 71.6 73.4 75.2 78.8 80.6 [°F D.B.] [°C D.B.] Indoor Temperature Figure 12 Outdoor unit temperature correction To be used to correct outdoor unit capacity only Indoor Temperature 70.0°F (21.1°C) D.B.

  • Page 22: Standard Operation Data (Reference Data)

    4-3. STANDARD OPERATION DATA (REFERENCE DATA) Outdoor unit model Operation MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 Indoor 80°F/67°F 70°F/60°F 80°F/67°F 70°F/60°F Ambient DB/WB temperature Outdoor 95°F/75°F 47°F/43°F 95°F/75°F 47°F/43°F No. of connected units Unit Indoor unit No. of units in operation Model — 09 × 4 09 ×...
  • Page 23 4-4. STANDARD CAPACITY DIAGRAM 4-4-1. MXZ-4C36NAHZ2-U1 <cooling> Non-Ducted Ducted Nominal cooling capacity Btu/h 36,000 36,000 36,000 Input 2,570 2,720 2,880 Current (208V) 12.8 13.5 14.2 Current (230V) 11.6 12.2 12.9 G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h) 208, 230 V Total capacity of indoor units (kBtu/h) OCH730C...
  • Page 24 4-4-2. MXZ-4C36NAHZ2-U1 <heating> Non-Ducted Ducted Nominal heating capacity Btu/h 45,000 45,000 45,000 Input 3,340 3,470 3,560 Current (208V) 16.4 17.0 17.4 Current (230V) 14.8 15.4 15.7 G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h) 208, 230 V Total capacity of indoor units (kBtu/h) OCH730C...
  • Page 25 4-4-3. MXZ-5C42NAHZ2-U1 <cooling> Non-Ducted Ducted Nominal cooling capacity Btu/h 42,000 42,000 42,000 Input 3,130 3,470 3,890 Current (208V) 15.5 17.1 19.0 Current (230V) 14.0 15.4 17.2 G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h) 208, 230 V Total capacity of indoor units (kBtu/h) OCH730C...
  • Page 26 4-4-4. MXZ-5C42NAHZ2-U1 <heating> Non-Ducted Ducted Nominal heating capacity Btu/h 48,000 48,000 48,000 Input 3,430 3,750 4,140 Current (208V) 16.8 18.3 20.2 Current (230V) 15.2 16.6 18.3 G(x) Total capacity of indoor units (kBtu/h) 15.0 22.5 30.0 37.5 45.0 52.5 60.0 Total capacity of indoor units (kBtu/h) 208, 230 V 15.0...
  • Page 27 4-4-5. MXZ-8C48NA2-U1 MXZ-8C48NAHZ2-U1 <cooling> Non-Ducted Ducted Nominal cooling capacity Btu/h 48,000 48,000 48,000 Input 3,930 4,320 4,800 Current (208V) 19.2 21.1 23.3 Current (230V) 17.4 19.0 21.1 G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h)
  • Page 28 4-4-6. MXZ-8C48NA2-U1 MXZ-8C48NAHZ2-U1 <heating> Non-Ducted Ducted Nominal heating capacity Btu/h 54,000 54,000 54,000 Input 4,220 4,520 4,800 Current (208V) 20.6 22.0 23.3 Current (230V) 18.7 19.9 21.1 G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h)
  • Page 29 4-4-7. MXZ-8C60NA2-U1 <cooling> Non-Ducted Ducted Nominal cooling capacity Btu/h 60,000 60,000 60,000 Input 4,800 5,360 6,000 Current (208V) 23.4 26.1 29.2 Current (230V) 21.2 23.6 26.5 G(x) Total capacity of indoor units(kBtu/h) Total capacity of indoor units(kBtu/h) 208, 230 V Total capacity of indoor units(kBtu/h) OCH730C...
  • Page 30 4-4-8. MXZ-8C60NA2-U1 <heating> Non-Ducted Ducted Nominal heating capacity Btu/h 66,000 66,000 66,000 Input 5,530 5,530 5,530 Current (208V) 27.0 27.0 27.0 Current (230V) 24.4 24.4 24.4 G(x) Total capacity of indoor units(kBtu/h) Total capacity of indoor units(kBtu/h) 208 V, 230 V 208, 230 V Total capacity of indoor units(kBtu/h) OCH730C...
  • Page 31 4-5. CORRECTING CAPACITY FOR CHANGES IN THE LENGTH OF REFRIGERANT PIPING During cooling, obtain the ratio (and the equivalent piping length) of the outdoor units rated capacity and the total in-use indoor capacity, and find the capacity ratio corresponding to the standard piping length from Figure 13 to 16. Then multiply by the cooling capacity from Figure 7 and 8 in "4-2.
  • Page 32 Figure 15 MXZ-8C48NA2-U1 MXZ-8C48NAHZ2-U1 <Cooling> Total capacity of indoor unit 1.00 24 [kBtu/h] 0.95 0.90 36 [kBtu/h] 0.85 48 [kBtu/h] 0.80 62.4 [kBtu/h] 0.75 0.70 Piping equivalent length (ft) Figure 16 MXZ-8C60NA2-U1 <Cooling> Total capacity of indoor unit 1.00 30 [kBtu/h] 0.95...
  • Page 33 Figure 17 MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 MXZ-8C48NA2-U1 MXZ-8C48NAHZ2-U1 <Heating> 1.00 0.95 0.90 0.85 0.80 0.75 0.70 Piping equivalent length (ft) Figure 18 MXZ-8C60NA2-U1 <Heating> 1.00 0.95 0.90 0.85 0.80 0.75 0.70 Piping equivalent length (ft) (2) Method for Obtaining the Equivalent Piping Length Equivalent length = (length of piping to farthest indoor unit) + (0.3 ᵡ...

  • Page 34: Noise Criterion Curves

    HEARING FOR CONTINUOUS NC-20 NOISE CONTINUOUS NOISE 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz MXZ-8C48NA2-U1 MODE SPL(dB) LINE SPL(dB) MXZ-8C60NA2-U1 MODE LINE COOLING MXZ-8C48NAHZ2-U1 COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60...

  • Page 35: Outlines And Dimensions

    OUTLINES AND DIMENSIONS 5-1. OUTDOOR UNIT Unit: mm <inch> OCH730C...
  • Page 36 5-2. BRANCH BOX Unit: mm <inch> PAC-MKA52BC PAC-MKA53BC When installing the conduit. Set the attachment to the inner side of each panel. 58 〈2-9/32〉 SUSPENSION BOLT PITCH 〈25/32〉 〈1-3/32〉 320〈12-19/32〉 SUSPENSION BOLT: W3/8(M10) REFRIGERANT PIPE FLARED CONNECTION Unit: inch TO OUTDOOR UNIT LIQUID PIPE 1/4F 1/4F...

  • Page 37: Wiring Diagram

    WIRING DIAGRAM 6-1. OUTDOOR UNIT MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 MXZ-8C48NAHZ2-U1 OCH730C...
  • Page 38 MXZ-8C48NA2-U1 OCH730C...
  • Page 39 MXZ-8C60NA2-U1 OCH730C...
  • Page 40 PAC-MKA52BC PAC-MKA32BC OCH730C...
  • Page 41 PAC-MKA53BC PAC-MKA33BC SYMBOL NAME B.C. Branch box controller board Fuse <UL 6.3A 250V AC> F2~F4 Fuse <UL 10A 250V AC> Switch for indoor unit connection Switch for function selection Switch for function selection Connector <Connection for service> LED1,2 Light emitting diode TB3A~E Terminal block <To Indoor unit-A~E>...

  • Page 42: Necessary Conditions For System Construction

    NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION 7-1. TRANSMISSION SYSTEM SETUP OCH730C...
  • Page 43 (ø0.157 o ø0.117 o L(5-1/8)) o 5 ((ø4.0 o ø3.0 o L130) o 5) Branch box (ø0.157 o ø0.117 o L(5-1/8)) o 3 ((ø4.0 o ø3.0 o L130) o 3) MXZ-8C48NA2-U1 Thermistor(TH-A to E) Check valve Thermistor(TH7) <Gas pipe temperature>...
  • Page 44 MXZ-8C60NA2-U1 Thermistor(TH-A to E) Check valve Thermistor(TH7) <Gas pipe temperature> <High pressure> <Ambient> Service port 4-Way Valve (21S4) Strainer Solenoid valve(SV1) Room temperature Ball valve <Bypass> thermistor Oil separator (TH1 or RT11) Check valve Strainer Strainer High pressure Capillary <Low pressure> Distributor switch(63H) tube1...
  • Page 45 7-3. TYPICAL CONTROL SYSTEM Outdoor unit A-IC: A-control indoor unit Branch Box TB3A TB5/TB15 MA-RC: MA Remote controller A-IC MA-RC (01) WL-RC: Wireless Remote controller (51) IMPORTANT: TB5/TB15 TB3B M1 M2 S M1 M2 S A-IC MA-RC Make sure that the current leakage breaker is one (02) compatible with higher harmonics.
  • Page 46 ( 5) Group setting MA group or M-NET group setting cannot be set. (6) Restricted functions The following functions of system controller cannot be used. • DIDO controller (Interlock with the air conditioner) • Fan control of energy saving control or peak cut control function •...

  • Page 47: Troubleshooting

    TROUBLESHOOTING 8-1. TROUBLESHOOTING <Check code displayed by self-diagnosis and actions to be taken for service (summary)> Present and past check codes are logged, and they can be displayed on the wired remote controller and multi controller circuit board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summarized in the table below.
  • Page 48 8-2. CHECKPOINTS FOR TEST RUN 8-2-1. Procedures before test run (1) Before a test run, make sure that the following work is completed. • Installation related: Make sure that the panel of cassette type and electrical wiring are done. Otherwise electrical functions like auto vane will not operate normally. •...
  • Page 49 (2) Using SW3 in outdoor unit In the case of the test run from outdoor unit, all indoor units operate. Therefore, you cannot detect any erroneous connection of refrigerant pipes and the connecting wires. If it aims at detection of any erroneous connection, be sure to carry out the test run from remote controller with reference to "(1) Using remote controller."...
  • Page 50 ● During normal operation 1 2 3 4 5 6 7 8 The LED indicates the drive state of the controller in the outdoor unit. Compressor Indication 21S4 SV2* — — Always lit operated *SV2 is not equipped to MXZ-8C48NA2-U1, MXZ-8C60NA2-U1. OCH730C...

  • Page 51: Serial Communication Error

    8-3. SELF-DIAGNOSIS ACTION BY FLOWCHART Check code Serial communication error 0403 (Ed) Abnormal points and detection methods Causes and checkpoints If serial communication between the outdoor multi controller circuit board Wire breakage or contact failure of connector CN2 or and outdoor power circuit board is defective. Malfunction of communication circuit to power circuit board on outdoor multi controller circuit board Malfunction of communication circuit on outdoor...
  • Page 52 Check code Compressor temperature trouble 1102 (U2) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints (1) If TH4 falls into following temperature conditions; Malfunction of stop valve Over-heated compressor operation caused by ●exceeds 230°F [110 ] continuously for 5 minutes shortage of refrigerant ●exceeds 257°F [125 ] Defective thermistor...
  • Page 53 Check code Compressor temperature trouble 1102 (U2) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Disconnect the thermistor wiring to check the resistance.
  • Page 54 Check code High pressure trouble 1302 (UE) Chart 1 of 4 Abnormal points and detection methods Causes and checkpoints (1) High pressure abnormality (63H operation) Defective operation of stop valve (not fully open) Abnormal if 63H operates(*) during compressor operation. (*602 PSIG Clogged or broken pipe [4.15 MPaG]) Malfunction or locked outdoor fan motor...
  • Page 55 Check code High pressure trouble 1302 (UE) Chart 2 of 4 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the indoor unit filter clogged? Clean the filter.
  • Page 56 Check code High pressure trouble 1302 (UE) Chart 3 of 4 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the resistance detected? Replace the TH7. Disconnect the indoor LEV wiring to check the resistance.
  • Page 57 Check code High pressure trouble 1302 (UE) Chart 4 of 4 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the resistance detected? Replace the SV1. Is the connector for outdoor controller board 63H disconnected or Reconnect the connector or connect it tightly.
  • Page 58 Check code Superheat due to low discharge temperature trouble 1500 (U7) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints If the discharge superheat is continuously detected −27°F [−15°C](*) or less for Disconnection or loose connection of TH4 5 minutes even though the indoor LEV has minimum open pulse after the Defective holder of TH4 compressor starts operating for 10 minutes.
  • Page 59 Check code Superheat due to low discharge temperature trouble 1500 (U7) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the resistance detected? Replace the indoor LEV.
  • Page 60 Check code Refrigerant shortage trouble 1501 (U2) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints (1) When all of the following conditions are satisfied for 15 Defective operation of stop valve (not fully open) consecutive minutes: Defective thermistor 1.
  • Page 61 Check code Refrigerant shortage trouble 1501 (U2) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Is the resistance detected? Replace the thermistor. Check the 63HS voltage.
  • Page 62 Check code Closed valve in cooling mode 1501 (U2) Abnormal points and detection methods Causes and checkpoints If stop valve is closed during cooling operation. Outdoor liquid/gas valve is closed. Malfunction of outdoor LEV (LEV-A) (blockage) When both of the following temperature conditions are satisfied for 20 minutes or more during cooling operation.
  • Page 63 Check code Freeze protection of Branch box or Indoor unit 1503 (P6) Abnormal points and detection methods Causes and checkpoints The purpose of the check code is to prevent indoor unit from freezing or Wrong piping connection between indoor unit and dew condensation which is caused when a refrigerant keeps flowing into branch box the unit in STOP.
  • Page 64 Check code 4-way valve trouble in heating mode 1508 (EF) Abnormal points and detection methods Causes and checkpoints If 4-way valve does not operate during heating operation. 4-way valve failure Disconnection or failure of 4-way valve coil When any of the following temperature conditions is satisfied for 3 minutes Clogged drain pipe or more during heating operation Disconnection or loose connection of connectors...
  • Page 65 Check code Out-of-range outside air temperature 3121 Abnormal points and detection methods Causes and checkpoints When the ambient temperature thermistor detects the prohibited Outdoor air temperature temperature continuously for 3 minutes during operation (during Thermistor failure compressor operation), the unit makes an error stop and "3121" Wire failure appears on the LED1 and LED2.
  • Page 66 Check code Compressor current interruption (Locked compressor) 4100 (UF) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints If overcurrent of DC bus or compressor is detected within 30 seconds Closed stop valve since the compressor starts operating. Decrease of power supply voltage Looseness, disconnection, or wrong phase of compressor wiring connection...
  • Page 67 Check code Compressor current interruption (Locked compressor) 4100 (UF) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Connect the compressor wiring (U, V and Are they connected properly? W phase) properly, then turn the power back ON.
  • Page 68 Check code Compressor overcurrent interruption 4210 (UP) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints If overcurrent of DC or the compressor is detected after 30 seconds since Closed outdoor stop valve the compressor starts operating. Decrease of power supply voltage Looseness, disconnection or reverse phase of compressor wiring connection...
  • Page 69 Check code Compressor overcurrent interruption 4210 (UP) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Connect the compressor wiring (U, V and Are they connected properly? W phase) properly, then turn the power back ON.
  • Page 70 Check code Voltage shortage/overvoltage/PAM error/L1 open phase/primary 4220 current sensor error/power synchronization signal error (U9) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints If any of following symptoms are detected; Decrease/increase of power supply voltage L1 open-phase (Y model only) ●Decrease of DC bus voltage to 200 V (\/ model), 350 V (Y model) Primary current sensor failure ●Increase of DC bus voltage to 430 V (V model), 760 V (Y model)
  • Page 71 Check code Voltage shortage/overvoltage/PAM error/L1 open phase/primary 4220 current sensor error/power synchronization signal error (U9) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. The black square (■) indicates a switch position. Diagnosis Remedy Continued from the previous page.
  • Page 72 Check code Heat sink temperature trouble 4230 (U5) Abnormal points and detection methods Causes and checkpoints If TH8 detects a temperature outside the specified range during Blocked outdoor fan compressor operation. Malfunction of outdoor fan motor Blocked airflow path Thermistor <Heat sink> Rise of ambient temperature TH8: Characteristic defect of thermistor...
  • Page 73 Check code Power module trouble or overcurrent trouble 4250 (U6) Abnormal points and detection methods Causes and checkpoints If both of the following conditions are satisfied: Short-circuit caused by looseness or disconnection of compressor wiring 1. Overcurrent of DC bus or compressor is detected during compressor operation.
  • Page 74 Check code Fan trouble 4400 (U8) Abnormal points and detection methods Causes and checkpoints If no rotational frequency is detected, or detected a value outside the Malfunction of fan motor specified range during fan motor operation. Disconnection of CNF connector Defective outdoor multi controller circuit board ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
  • Page 75 Check code Compressor temperature thermistor (TH4) open/short 5101 (U3) <Detected in outdoor unit> Abnormal points and detection methods Causes and checkpoints If TH4 is detected to be open/short. Disconnection or contact failure of connectors (The open/short detection is disabled for 10 minutes after compressor Characteristic defect of thermistor starts, during defrosting operation, or for 10 minutes after returning from Defective outdoor multi controller circuit board...
  • Page 76 Check code Suction pipe temperature thermistor (TH6) open/short 5102 (U4) <Detected in outdoor unit> Abnormal points and detection methods Causes and checkpoints If TH6 is detected to be open/short. Disconnection or contact failure of connectors (The open/short detection is disabled during 10 seconds to 10 minutes. Characteristic defect of thermistor after compressor starts, during defrosting operation, or for 10 minutes after Defective outdoor multi controller circuit board...

  • Page 77: Outdoor Liquid Pipe Temperature Thermistor (Th3) Open/Short

    Check code 5105 Outdoor liquid pipe temperature thermistor (TH3) open/short (U4) Abnormal points and detection methods Causes and checkpoints If TH3 is detected to be open/short. Disconnection or contact failure of connectors (The open/short detection is disabled during 10 seconds to 10 minutes. Characteristic defect of thermistor after compressor starts, during defrosting operation, or for 10 minutes after Defective outdoor multi controller circuit board...
  • Page 78 Check code Ambient temperature thermistor (TH7) open/short 5106 (U4) Abnormal points and detection methods Causes and checkpoints If TH7 is detected to be open/short Disconnection or contact failure of connectors Open: −40°F [−40°C] or less Characteristic defect of thermistor Short: 194°F [90°C] or more TH7: Thermistor <Ambient>...
  • Page 79 Check code HIC pipe temperature thermistor (TH2) open/short 5109 (U4) Abnormal points and detection methods Causes and checkpoints If TH2 is detected to be open/short. Disconnection or contact failure of connectors Open: −40°F [−40°C] or less Characteristic defect of thermistor Short: 194°F [90°C] or more TH2: Thermistor <HIC pipe>...
  • Page 80 Check code Heat sink temperature thermistor (TH8) open/short 5110 (U4) Abnormal points and detection methods Causes and checkpoints If TH8 is detected to be open/short. Disconnection or contact failure of connectors Open: −31.2°F [−35.1°C] or less Characteristic defect of thermistor Short: 338.5°F [170.3°C] or more Defective outdoor multi controller circuit board TH8: Thermistor <Heat sink>...
  • Page 81 Check code High pressure sensor (63HS) trouble 5201 (F5) Abnormal points and detection methods Causes and checkpoints When the detected pressure in the high pressure sensor is 14.2 PSIG [1 Defective high pressure sensor kgf/cm ] or less during operation, the compressor stops operation and Decrease of internal pressure caused by gas enters into an anti-restart mode for 3 minutes.
  • Page 82 Check code Low pressure sensor (63LS) trouble 5202 (F3) Abnormal points and detection methods Causes and checkpoints When the detected pressure in the low pressure sensor is −32.7 PSIG Defective low pressure sensor [−2.3kgf/cm ] or less, or 328.6 PSIG [23.1kgf/cm ] or more during Decrease of internal pressure caused by gas operation, the compressor stops operation with a check code <5202>.
  • Page 83 Primary current sensor detects any of the following conditions (single Disconnection of compressor wiring phase unit only): Current sensor trouble on outdoor power circuit Model name 10 consecutive second detection One-time detection board MXZ-8C48NA2-U1 34 A 38 A Wiring through current sensor (penetration type) is MXZ-8C60NA2-U1 not done. MXZ-4C36NAHZ2-U1...

  • Page 84: Duplex Address Error

    Check code Duplex address error 6600 (A0) Abnormal points and detection methods Causes and checkpoints If 2 or more units with the same address are existing. There are 2 units or more with the same address in their controller among outdoor unit, indoor unit, Fresh Master, Lossnay or remote controller Noise interference on indoor/outdoor connectors ●Diagnosis of defects...
  • Page 85 Check code Transmission processor hardware error 6602 (A2) Abnormal points and detection methods Causes and checkpoints If the transmission line shows "1" although the transmission processor A transmitting data collision occurred because of a transmitted "0". wiring work or polarity change has performed while the power is ON on either of the indoor/outdoor unit, Fresh Master or Lossnay Malfunction of transmitting circuit on transmission...

  • Page 86: Transmission Bus Busy Error

    Check code Transmission bus BUSY error 6603 (A3) Abnormal points and detection methods Causes and checkpoints An abnormality when no transmission status caused by transmitting The transmission processor is unable to transmit due data collision continues for 8 to 10 minutes. to a short-cycle voltage such as noise is mixed on An abnormality when data cannot be output on the transmission line the transmission line.
  • Page 87 Check code Signal communication error with transmission processor 6606 (A6) Abnormal points and detection methods Causes and checkpoints If the data of unit/transmission processor were not normally transmitted. Accidental disturbance such as noise or lightning surge If the address transmission from the unit processor was not normally Hardware malfunction of transmission processor transmitted.
  • Page 88 Check code No ACK error 6607 (A7) Chart 1 of 4 Abnormal points and detection methods Causes and checkpoints Represents a common error detection The previous address unit does not exist since An abnormality detected by the sending side controller when receiving the address switch was changed while in electric no ACK from the receiving side, though signal was once sent.
  • Page 89 Check code No ACK error 6607 (A7) Chart 2 of 4 Abnormal points and detection methods Causes and checkpoints The cause of displayed address and attribute is on the Fresh Master While the indoor unit is operating with multi side refrigerant system Fresh Master, an abnormality An abnormality detected by the indoor unit if receiving no ACK when is detected when the indoor unit transmits signal...
  • Page 90 Check code No ACK error 6607 (A7) Chart 3 of 4 Note: ●Diagnosis of defects When the address of the outdoor unit is displayed as abnormal, the Make sure to turn the power OFF before connecting/disconnecting outdoor circuit board may be faulty. If the unit is not restored after any connectors, or replacing boards.
  • Page 91 Check code No ACK error 6607 (A7) Chart 4 of 4 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Apply the correct kind of transmission line, Is the correct kind of transmission then perform the procedure 1.

  • Page 92: No Response Frame Error

    Check code No response frame error 6608 (A8) Abnormal points and detection methods Causes and checkpoints If receiving no response command while already received ACK. Continuous failure of transmission due to noise etc. The sending side searches the error in 30 seconds interval for 6 times Decline of transmission voltage/signal caused by continuously.
  • Page 93 Check code MA communication receive error 6831(E0/E4) 6834(E0/E4) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints Detected in remote controller or indoor unit: Contact failure of remote controller wirings Irregular Wiring When the main or sub remote controller cannot receive signal from (A wiring length, number of connecting remote indoor unit which has the "0"...
  • Page 94 Check code MA communication receive error 6831(E0/E4) 6834(E0/E4) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Refer to the chapter "Electrical Work".
  • Page 95 Check code MA communication send error 6832(E3/E5) 6833(E3/E5) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints Detected in remote controller or indoor unit. There are 2 remote controllers set as main. Malfunction of remote controller sending/receiving circuit Malfunction of sending/receiving circuit on indoor controller board...
  • Page 96 Check code MA communication send error 6832(E3/E5) 6833(E3/E5) Chart 2 of 2 ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page. Refer to the chapter "Electrical Work".

  • Page 97: Total Capacity Error

    Check code Total capacity error 7100 (EF) Abnormal points and detection methods Causes and checkpoints When the total of the number on connected indoor unit model names The total of number on connected indoor unit model exceeds the specified capacity level (130% of the number on the outdoor names exceeds the specified capacity level: unit model name), a check code <7100>...

  • Page 98: Capacity Code Error

    Check code Capacity code error 7101 (EF) Abnormal points and detection methods Causes and checkpoints When the capacity of connected indoor unit is over, a check code <7101> The model name of connected indoor unit (model code) is displayed. is read as incompatible. ●Diagnosis of defects Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
  • Page 99 Check code Connecting excessive number of units and branch boxes 7102 (EF) Abnormal points and detection methods Causes and checkpoints When the connected indoor units or branch boxes exceed the limit, a Connecting more indoor units and branch boxes than check code <7102>...

  • Page 100: Address Setting Error

    Check code Address setting error 7105 (EF) Abnormal points and detection methods Causes and checkpoints The address setting of outdoor unit or branch box is wrong. Wrongly set address of branch box The outdoor unit is not set in 000, or in the range of 51 to 100.
  • Page 101 Check code Incompatible unit combination 7130 (EF) Abnormal points and detection methods Causes and checkpoints When the connected indoor unit is not compatible with the outdoor unit, Connecting indoor unit(s) which is not authorized to the outdoor unit detects the error at startup. connect to the outdoor unit.
  • Page 102 8-4. TROUBLESHOOTING BY INFERIOR PHENOMENA Phenomena Factors Countermeasures 1. Remote controller display works Refrigerant shortage If refrigerant leaks, discharging tempera- normally and the unit performs cool- ture rises and LEV opening increases. ing operation, however, the capacity Inspect leakage by checking the tem- cannot be fully obtained.
  • Page 103 8-5. OUTDOOR UNIT INPUT/OUTPUT CONNECTOR State (CN51) A Distant control board E Lamp power supply B Relay circuit F Procure locally C External output adapter (PAC-SA88HA-E) G Max. 10 m CN51 D Outdoor unit control board L1: Error display lamp L2: Compressor operation lamp X, Y: Relay (coil rating: ≤...
  • Page 104 8-6. HOW TO CHECK THE PARTS OUTDOOR UNIT: MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 MXZ-8C48NAHZ2-U1 MXZ-8C48NA2-U1 MXZ-8C60NA2-U1 Checkpoints Parts name Thermistor (TH3) Disconnect the connector then measure the resistance with a multimeter. (At the ambient temperature 50 to 80˚F [10 to 30°C]) <Outdoor liquid pipe>...
  • Page 105 Check method of DC fan motor (fan motor/outdoor multi controller circuit board) 1. Notes • High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay attention to the service. • Do not pull out the connector (CNF1, 2) for the motor with the power supply on. board and fan motor.) (It causes trouble of the outdoor multi controller circuit 2.
  • Page 106 Check method of multi controller circuit board Multi controller circuit board check Fuse check Check the fuse on multi controller circuit board Disconnect the FAN motor connector and (blow) measure the resistance of connector pins. Replace outdoor multi controller Did the fuse blow? Is the fan motor normal? Refer to “8-6.
  • Page 107 Check method of power circuit board Power circuit board check Note: To check the voltage of the parts on this board with a multimeter is difficult due to its location. Test points are limited. Is the voltage of main incoming power •...
  • Page 108 MXZ-8C48NA2-U1 M-NET power circuit board Multi controller circuit board CNAC (RD) 208 VAC (＋10%/-5%) /230 VAC (WH) (±10%) 208 VAC Power circuit board (＋10%/-5%) /230 VAC (±10%) 208 VAC (＋10%/-5%) /230 VAC (±10%) COMP U-V 10–180 VAC V-W 10–180 VAC Multi controller circuit board W-U 10–180 VAC...
  • Page 109 8-7. HOW TO CHECK THE COMPONENTS <Thermistor characteristic Graph> Low temperature thermistors • Thermistor <HIC pipe> (TH2) • Thermistor <Outdoor liquid pipe> (TH3) • Thermistor <Suction pipe> (TH6) • Thermistor <Ambient> (TH7) Thermistor R0 = 15 kΩ ± 3% B constant = 3480 ± 1% =15exp{3480( –...
  • Page 110 <HIGH PRESSURE SENSOR> • Comparing the High Pressure Sensor Measurement and Gauge Pressure By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the high pressure sensor appears on the LED1, 2 on the control board. The figure at left shows that the switches 1 through 4 are set to ON and 5 through 8 are set to OFF.

  • Page 111: Low Pressure Sensor Configuration (63Ls)

    <LOW PRESSURE SENSOR> • Comparing the Low Pressure Sensor Measurement and Gauge Pressure By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the low pressure sensor appears on the LED1 on the control board. The figure at left shows that the switches 1 through 4 are set to ON and 5 through 8 are set to OFF.
  • Page 112 BRANCH BOX: PAC-MKA52BC PAC-MKA32BC PAC-MKA53BC PAC-MKA33BC Parts name Checkpoints Disconnect the connector then measure the resistance with a multimeter. Thermistor (At the ambient temperature 50 to 86°F [10 to 30°C]) (TH-A to E) <Gas pipe> Normal Abnormal 4.3 to 9.6k" Open or short Disconnect the connector then measure the resistance with a multimeter.

  • Page 113: Linear Expansion Valve

    Linear expansion valve (LEV) in Branch box (1) Operation summary of the linear expansion valve • Linear expansion valve open/close through stepping motor after receiving the pulse signal from the branch box controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the branch box controller board and the linear expansion valve>...
  • Page 114 (3) How to attach and detach the coil of linear expansion valve <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Coil Lead wire Stopper <How to detach the coil> Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward.
  • Page 115 Troubleshooting Checkpoint Corrective measures Problems Locked expansion Replace the linear If the linear expansion valve becomes locked and the motor is still operating, valve expansion valve. the motor will emit a clicking noise and will not function. This clicking noise indicates an abnormality.

  • Page 116: Test Point Diagram

    8-8. TEST POINT DIAGRAM Outdoor multi controller circuit board MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 MXZ-8C48NAHZ2-U1 MXZ-8C48NA2-U1 MXZ-8C60NA2-U1 <CAUTION> TEST POINT is high voltage. CN51 External signal Model selection Pump down Test run Manual defrost Model selection output CN102 Connect to the M-P.B (M-NET power circuit board)
  • Page 117 Outdoor power circuit board Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 1. Check of POWER MODULE MXZ-8C48NAHZ2-U1 Check of DIODE circuit R - L1 , S - L1 , R - N1 , S - N1 MXZ-8C60NA2-U1 Check of IGBT circuit...
  • Page 118 Outdoor power circuit board If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). MXZ-8C48NA2-U1 1. Check of POWER MODULE Check of DIODE circuit R - P1 S - P1 R - N1 S - N1...
  • Page 119 Outdoor noise filter circuit board MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 LI, NI POWER SUPPLY MXZ-8C48NAHZ2-U1 Voltage of 208/230 VAC is input MXZ-8C60NA2-U1 (Connect to the terminal block (TB1)) CNAC1 208/230 VAC Connect to the M-NET power circuit board (CN1) CNAC2 208/230 VAC Connect to the outdoor multi controller circuit board (CNAC) El, E2, E3, E4...
  • Page 120 Connect to the outdoor multi controller circuit board (CN102) – : 24–30 VDC MXZ-4C36NAHZ2-U1 – : 24–30 VDC MXZ-5C42NAHZ2-U1 MXZ-8C48NAHZ2-U1 MXZ-8C48NA2-U1 MXZ-8C60NA2-U1 Connect to the electrical parts box Connect to the outdoor power circuit board (CNAC1) – : 208/230 VAC...
  • Page 121 Branch box controller board (B.C.) PAC-MKA52BC PAC-MKA32BC TH-A to E LEV-A to E Connect to thermistor-A to E Connect to LEV-A to E TH-D and E for PAC-MKA52BC only LEV-D and E for PAC-MKA52BC only CN3M Connected to the terminal block (TB5) (M-NET transmission con- necting wire)
  • Page 122 Branch box controller board (B.C.) PAC-MKA53BC PAC-MKA33BC LEV-A to E TH-A to E Connect to LEV-A to E Connect to thermistor-A to E LEV-D and E for PAC-MKA53BC only TH-D and E for PAC-MKA53BC only CN3M Connected to the terminal block (TB5) (M-NET transmission con- necting wire)
  • Page 123 8-9. INTERNAL SWITCH FUNCTION TABLE (1) Function of switches MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 MXZ-8C48NAHZ2-U1 MXZ-8C48NA2-U1 MXZ-8C60NA2-U1 Continue to the next page. OCH730C...
  • Page 124 OCH730C...
  • Page 125 OCH730C...
  • Page 126 PAC-MKA52BC PAC-MKA32BC PAC-MKA53BC PAC-MKA33BC OCH730C...

  • Page 127: Outdoor Unit Functions

    8-10. OUTDOOR UNIT FUNCTIONS OCH730C...
  • Page 128 OCH730C...
  • Page 129 OCH730C...
  • Page 130 OCH730C...
  • Page 131 OCH730C...
  • Page 132 OCH730C...
  • Page 133 OCH730C...
  • Page 134 OCH730C...
  • Page 135 8-11. BRANCH BOX UNIT OPERATION MONITOR FUNCTION [When optional part ‘A-Control Service Tool (PAC-SK52ST)’ is connected to branch box controller board (CNM)] Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of check code by controlling DIP SW2 on ‘A-Control Service Tool’.
  • Page 136 The black square (■) indicates a switch position. SW2 setting SW5 setting* Display detail Explanation for display Unit ― ― Common Not used Individual unit Actual opening pulse 0 to 500 of LEV (When it is 100 pulse or more, it displays a hundredth, 2 3 4 5 6 (Direct-operated tens, and unit digit by turns.)
  • Page 137 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit SW5 setting* ― ― Common Not used Individual unit Indoor thermistor −38 to 190 [−39 to 88] <pipe temperature/ °F 2 3 4 5 6 (When the temperature is 0 or less, "−"...
  • Page 138 8-12. SELECTING FUNCTIONS USING THE REMOTE CONTROLLER Each function can be set as necessary using the remote controller. The setting of function for each unit can only be done by the remote controller. Select function available from the <Table 1> . (1) Functions available when setting the unit number to 00 Note that the functions in the table below are available only when P-series indoor unit and the wired remote controller is used.

  • Page 139: Precautions Against Refrigerant Leakage

    PRECAUTIONS AGAINST REFRIGERANT LEAKAGE 9-1. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE 9-1-1. Introduction R410A refrigerant of this air conditioner is non-toxic and non-flammable but leaking of large amount from an indoor unit into the room where the unit is installed may be deleterious. To prevent possible injury, the rooms should be large enough to keep the R410A concentration specified by ISO 5149-1 as follows.

  • Page 140: Disassembly Procedure

    DISASSEMBLY PROCEDURE 10-1. OUTDOOR UNIT Note: Turn OFF the power supply before disassembly. MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2-U1 MXZ-8C48NAHZ2-U1 : Indicates the visible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES Removing the service panel and top panel Photo 1 Top panel fixing screws Remove 3 service panel fixing screws (5 ×...

  • Page 141: Operating Procedure

    From the previous page. OPERATING PROCEDURE PHOTOS/FIGURES (6) Remove 2 electrical parts box fixing screws (4 × 10), Photo 5 Electrical parts then detach the electrical parts box by pulling it upward. The electrical parts box is fixed with 2 hooks on the left and 1 hook on the right.
  • Page 142 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the thermistor <Outdoor liquid pipe> (TH3) and Photo 9 thermistor <Compressor> (TH4), thermistor <HIC pipe> (TH2) (1) Remove the service panel. (See Photo 1) (2) Disconnect the connectors, TH3 (white) and TH4 (white), TH2 (black) on the multi controller circuit board in the electrical parts box.
  • Page 143 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing bypass valve coil (SV1, SV2) and bypass valve Photo 11 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Switching (3) Remove the cover panel (front). (Refer to procedure 8(5)) Switching Linear expansion valve coil...
  • Page 144 OPERATING PROCEDURE PHOTOS/FIGURES Photo 13 13. Removing the compressor (MC) (1) Remove the service panel. (See Photo 1) Valve bed (2) Remove the top panel. (See Photo 1) Valve bed (3) Remove the cover panel (front). (Refer to procedure 8(5)) fixing screw (4) Remove the cover panel (rear) (Refer to procedure 8(6)) Valve bed...
  • Page 145 OPERATING PROCEDURE PHOTOS/FIGURES 15. Removing the reactor (DCL) Figure 3 (1) Remove the service panel. (See Photo 1) Reactors (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box (See Photo 5) (4) Remove 6 screws (4 x 10) for reactor to remove the reactors.
  • Page 146 MXZ-8C48NA2-U1 Note: Turn OFF the power supply before disassembly. : Indicates the visible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES Top panel fixing screws Photo 1 1. Removing the service panel and top panel Top panel (1) Remove 3 service panel fixing screws (5 × 12) and slide...
  • Page 147 From the previous page. OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 (6) Remove 2 electrical parts box fixing screws (4 × 10) and Electrical parts box detach the electrical parts box by pulling it upward. The electrical parts box is fixed with 2 hooks on the left Hook and 1 hook on the right.
  • Page 148 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the thermistor <Outdoor liquid pipe> (TH3) and Photo 9 thermistor <Compressor> (TH4), thermistor <HIC pipe> (TH2) (1) Remove the service panel. (See Photo 1) (2) Disconnect the connectors, TH3 (white) and TH4 (white), TH2 (black) on the multi controller circuit board in the electrical parts box.
  • Page 149 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing bypass valve coil (SV1) and bypass valve Photo 11 (1) Remove the service panel. (See Photo 1) Linear expansion (2) Remove the top panel. (See Photo 1) valve coil (LEV-B) Linear (3) Remove the cover panel (front). (Refer to procedure 8 (5)) expansion valve (4) Remove the cover panel (rear).
  • Page 150 OPERATING PROCEDURE PHOTOS/FIGURES 13. Removing the compressor (MC) Photo 13 (1) Remove the service panel. (See Photo 1) Valve bed (2) Remove the top panel. (See Photo 1) (3) Remove the cover panel (front). (Refer to procedure 8(5)) Valve bed Valve bed fixing screw (4) Remove the cover panel (rear) (Refer to procedure 8(6))
  • Page 151 OPERATING PROCEDURE PHOTOS/FIGURES 15. Removing the reactor (DCL) Figure 3 (1) Remove the service panel. (See Photo 1) Reactors (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box (See photo 5) (4) Remove 6 screws (4 x 10) for reactors to remove the reac- tors.
  • Page 152 MXZ-8C60NA2-U1 Note: Turn OFF the power supply before disassembly. : Indicates the visible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES Top panel fixing screws Photo 1 1. Removing the service panel and top panel Top panel (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service Service panel panel.
  • Page 153 From the previous page. OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 (6) Remove 2 electrical parts box fixing screws (4 × 10) then detach the electrical parts box by pulling it upward. The Electrical parts electrical parts box is fixed with 2 hooks on the left and 1 hook on the right.
  • Page 154 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the thermistor <Outdoor liquid pipe> (TH3) and Photo 9-1 thermistor <Compressor> (TH4), thermistor <HIC pipe> Thermistor <Hic pipe> (TH2) (TH2) (1) Remove the service panel. (See Photo 1) (2) Disconnect the connectors, TH3 (white) and TH4 (white), TH2 (black) on the multi controller circuit board in the electrical parts box.
  • Page 155 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing bypass valve coil (SV1) and bypass valve Photo 11 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the cover panel (front). (Refer to procedure 8(5)) Bypass valve (4) Remove the cover panel (rear) (Refer to procedure 8(6)) Bypass valve...
  • Page 156 OPERATING PROCEDURE PHOTOS/FIGURES 13. Removing the compressor (MC) Photo 13 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the cover panel (front). (Refer to procedure 8(5)) (4) Remove the cover panel (rear) (Refer to procedure 8(6)) (5) Remove the side panel (R).
  • Page 157 OPERATING PROCEDURE PHOTOS/FIGURES 14. Removing the accumulator Photo 15 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 5) (4) Remove the valve bed. (See procedure 8 (4)) (5) Remove the cover panel (front).
  • Page 158 10-2. BRANCH BOX: PAC-MKA52BC PAC-MKA32BC PAC-MKA53BC PAC-MKA33BC PHOTO: PAC-MKA52BC : Indicates the visible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the controller cover and under panel Photo 1 (1) Remove 3 controller cover fixing screws (4 ᵡ 10) to detach Under panel fixing screws the controller cover.
  • Page 159 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the LEV coil (LEV-A to E*) Photo 3 (1) Remove the controller cover. (See Photo 1) Rubber mount Bands Header assy (2) Remove the under cover. (See Photo 1) (3) Remove 8 insulations, then remove 9 pipe cover fixing Bands LEV assy screws (4 ᵡ...
  • Page 160 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the LEV assy Photo 5-1 (1) Remove the controller cover. (See Photo 1) (2) Remove the under panel. (See Photo 1) LEV assy (3) Remove 8 the insulations, then remove 9 pipe box (under) fixing screws (4 ᵡ 10). (See Photo 2-1) (4) Loosen the side clamps, then disconnect the LEV and thermistor connectors on the controller board.

  • Page 161: Remote Controller

    REMOTE CONTROLLER 11-1. REMOTE CONTROLLER FUNCTIONS <PAR-40MAA> Controller interface The functions of the function buttons change depending on the screen. Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen. When the system is centrally controlled, the button function guide that corresponds to the locked button will not appear.

  • Page 162: Room Temperature

    Display The main display can be displayed in two different modes: “Full” and “Basic”. The initial setting is “Full”. To switch to the “Basic” mode, change the setting on the Main display setting. (Refer to operation manual included with remote controller.) <Full mode>...

  • Page 163: Operation

    Menu structure Main menu Press the button. MENU Move the cursor to the desired item with the buttons, and press the button. SELECT Operation Vane · Louver · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-See sensor Timer menu Timer ON/OFF timer Auto-OFF timer...
  • Page 164 Continue from the previous page. Maintenance menu Error information Filter information Cleaning Auto descending panel Descending operation Descending adjustment Service menu Test run menu Test run Drain pump test run Maintenance information Model name input Serial No. input Dealer information input Initialize maintenance info.

  • Page 165: Main Menu List

    Main menu list Main Setting and display items Setting details menu Operation Vane · Louver · Vent. Use to set the vane angle. (Lossnay) • Select a desired vane setting. Use to turn ON/OFF the louver. • Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation.
  • Page 166 Setting and display Main menu Setting details items Initial Display Main display Use to switch between "Full" and "Basic" modes for the Main display, and use setting setting to change the background colors of the display to black. Display de- Make the settings for the remote controller related items as necessary.

  • Page 167: Controller Interface

    <PAR-FL32MA> Controller interface Transmission area Transmission indicator Remote controller display Timer indicator *For explanation purposes, all of the items that appear in the display are shown. *All items are displayed when the Reset button is pressed. Operation areas ON/OFF button Temperature setting buttons Fan Speed button (Changes fan speed) Timer Off button...
  • Page 168 <PAR-SL100A-E> Controller interface Transmission area Remote controller display Set Temperature buttons OFF/ON button Mode button (Changes operation mode) Fan Speed button (Changes fan speed) Airflow button (Changes up/ i-see button* down airflow direction) Timer ON button Menu button Timer OFF button SET/SEND button Weekly timer ON/OFF button* CANCEL button...

  • Page 169: Error Information

    11-2. ERROR INFORMATION When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. 1. Check code, error unit, refrigerant address, model name, and se- Error information rial number will appear. Error code The model name and serial number will appear only if the informa- Error unit...
  • Page 170 • Checking the error information Maintenance menu While no errors are occurring, page 2/2 of the error information can be Error information viewed by selecting "Error information" from the Maintenance menu. Filter information Errors cannot be reset from this screen. Cleaning Main menu: RETURN Cursor...

  • Page 171: Service Menu

    11-3. SERVICE MENU Maintenance password is required 1. Select "Service" from the Main menu, and press the [SELECT] button. Main Main menu *At the main display, the menu button and select "Service" to make the Service maintenance setting. 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.

  • Page 172: Test Run Operation

    11-4. TEST RUN 11-4-1. PAR-40MAA 1. Select "Service" from the Main menu, and press the [SELECT] button. Test run Input maintenance info. Settings Check Select "Test run" with the F1 or F2 button, and press the [SELECT] button. Others : RETURN SELECT MENU RETURN...
  • Page 173 11-4-2. PAR-FL32MA Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500 V Megger and check that it is equal to or greater than 1.0 MΩ. TEST RUN Turn on the main power to the unit. TEST RUN Press the button twice continuously.

  • Page 174: Function Setting

    11-5. FUNCTION SETTING 11-5-1. PAR-40MAA Settings menu Function setting 1. Select "Service" from the Main menu, and press the [SELECT] button. Select "Setting" from the Service menu, and press the [SELECT] button. Service menu: MENU Select "Function setting", and press the [SELECT] button. SELECT MENU RETURN...
  • Page 175 11-5-2. PAR-FL32MA Functions can be selected with the wireless remote controller. Function selection using wireless remote controller is available only for refriger- ant system with wireless function. Refrigerant address cannot be specified by the wireless remote controller. [Flow of function selection procedure] Flow of function selection procedure The flow of the function selection procedure is shown below.
  • Page 176 11-5-3. PAR-SL100A-E 1. Going to the function select mode Press the button between of 5 seconds. (Start this operation from the status of remote controller display turned off.) [CHECK] is lit and "00" blinks. (Fig. 1) Press the button to set the "50". Direct the wireless remote controller toward the receiver of the indoor unit and press the button.

  • Page 177: Error History

    11-6. ERROR HISTORY 1. Select "Service" from the Main menu, and press the [SELECT] button. Test run Input maintenance info. Settings Check Others : RETURN Select "Check" with the F1 or F2 button, and press the [SELECT] button. SELECT MENU RETURN HOLD 2.

  • Page 178: Self-Diagnosis

    11-7. SELF-DIAGNOSIS 11-7-1. PAR-40MAA 1. Select "Service" from the Main menu, Diagnosis and press the [SELECT] button. Self check Remote controller check Select "Check" from the Service menu, and press the [SELECT] button. Service menu: MENU Cursor Select "Diagnosis" from the Check menu, and press the [SELECT] button.
  • Page 179 11-7-2. PAR-FL32MA When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> Refrigerant [Procedure] address display 1. Press the CHECK button twice. CHECK •...

  • Page 180: Remote Controller Check

    11-8. REMOTE CONTROLLER CHECK If operations cannot be completed with the remote controller, diagnose the remote controller with this function. 1. Select "Service" from the Main menu, and Diagnosis press the [SELECT] button. Self check Remote controller check Select "Check" from the Service menu, and press the [SELECT] button.
  • Page 181 11-9. SMOOTH MAINTENANCE Check menu 1. Select "Service" from the Main menu, and press the [SELECT] button. Error history Diagnosis Smooth maintenance Request code Select "Check" with the F1 or F2 button, and press the [SELECT] button. Service menu: MENU Cursor Select "Smooth maintenance"...

  • Page 182: Request Code

    ■ Refrigerant address Single refrigerant system Multi refrigerant system (group control) In the case of single refrigerant system, the refrigerant address Up to 16 refrigerant systems (16 outdoor units) can be con- is "00" and no operation is required. nected as a group by 1 remote controller. To check or set the Simultaneous twin, triple units belong to this category refrigerant addresses.
  • Page 183 OCH730C...
  • Page 184 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN ©Copyright 2020 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2024 No.OCH730 REVISED EDITION-C Issued: Mar. 2023 No.OCH730 REVISED EDITION-B Issued: Sep. 2020 No.OCH730 REVISED EDITION-A Published: Jan. 2020 No.OCH730 Made in Japan Specifications are subject to change without notice.

This manual is also suitable for:

Mxz-8c60na2Mxz-4c36nahz2Mxz-5c42nahz2Mxz-8c48nahz2Pac-mka52bcPac-mka32bc ... Show all

Table of Contents

Save PDF