Mitsubishi MXZ-4C36NAHZ Technical & Service Manual
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Mitsubishi MXZ-4C36NAHZ Technical & Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
[Model Name]
<Outdoor unit>
MXZ-4C36NAHZ
MXZ-5C42NAHZ
MXZ-8C48NAHZ
MXZ-8C48NA
MXZ-8C60NA
<Branch box>
PAC-MKA50BC
PAC-MKA30BC
PAC-MKA51BC
PAC-MKA31BC
OUTDOOR UNIT: MXZ-4C36NAHZ
BRANCH BOX: PAC-MKA51BC
[Service Ref.]
MXZ-4C36NAHZ
MXZ-4C36NAHZ-U1
MXZ-5C42NAHZ
MXZ-5C42NAHZ-U1
MXZ-8C48NAHZ
MXZ-8C48NAHZ-U1
MXZ-8C48NA
MXZ-8C48NA-U1
MXZ-8C60NA-U1
PAC-MKA50BC
PAC-MKA30BC
PAC-MKA51BC
PAC-MKA31BC
Model name
indication
CONTENTS
TECHNICAL CHANGES ......................................... 2
1. SAFETY PRECAUTION .................................... 3
2. OVERVIEW OF UNITS ...................................... 6
3. SPECIFICATIONS ............................................ 10
4. DATA ................................................................ 14
5. OUTLINES AND DIMENSIONS ...................... 36
6. WIRING DIAGRAM ......................................... 40
8. TROUBLESHOOTING .................................... 52
10. DISASSEMBLY PROCEDURE ...................... 141
PARTS CATALOG (OCB573)
HFC
utilized
R410A
October 2016
No. OCH573
REVISED EDITION-C
Revision:
• Added PAC-MKA51BC,
PAC-MKA31BC,
MXZ-4C36NAHZ-U1,
MXZ-5C42NAHZ-U1,
MXZ-8C48NAHZ-U1,
MXZ-8C48NA-U1, and
MXZ-8C60NA-U1 in REVISED
EDITION-C.
• Some descriptions have been
modified.
OCH573 REVISED EDITION-B
is void.
Notes:
• This service manual
describes technical data of
outdoor unit and branch box.
As for indoor units, refer to
its service manual.
• RoHS compliant products
have <G> mark on the spec
name plate.

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Summary of Contents for Mitsubishi MXZ-4C36NAHZ

  • Page 1: Table Of Contents

    5. OUTLINES AND DIMENSIONS ...... 36 6. WIRING DIAGRAM ......... 40 7. NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION ..47 8. TROUBLESHOOTING ........52 9. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE ..140 OUTDOOR UNIT: MXZ-4C36NAHZ 10. DISASSEMBLY PROCEDURE ...... 141 PARTS CATALOG (OCB573) BRANCH BOX: PAC-MKA51BC...

  • Page 2: Technical Changes

    TECHNICAL CHANGES Service ref. have been changed as follows. MXZ-4C36NAHZ MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ MXZ-8C48NAHZ-U1 MXZ-8C48NA MXZ-8C48NA-U1 • The shape of piping around a stop valve (T7W E04 410) has been changed. • The shape of valve bed has been changed.

  • Page 3: Safety Precaution

    SAFETY PRECAUTION 1-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuit must be disconnected. 1-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use a vacuum pump with a reverse flow check Use new refrigerant pipes. valve.
  • Page 4 [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them. [2] Additional refrigerant charge When charging directly from cylinder (1) Check that cylinder for R410A on the market is a syphon type.
  • Page 5 1-3. Cautions for refrigerant piping work New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A 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 R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.

  • Page 6: Overview Of Units

    SEZ and PEAD-series units. (Only if connecting to PAC-MKA50/51BC) When the system includes even 1 unit of PLA-A·EA7, the number of the maximum connectable indoor units is decreased as follows: 3 for MXZ-4C36NAHZ-U1, 4 for MXZ-5C42NAHZ-U1, and 6 for MXZ-8C48NA(HZ)-U1 and MXZ-8C60NA-U1 OCH573C...
  • Page 7 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 microcomputer, the branch box can translate the transmission signal of indoor units to achieve the optimum control.
  • Page 8 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 9 2-4. SIMPLIFIED PIPING SYSTEM Piping connection size The piping connection size differs according to the type and capacity of indoor units. {3/8 inch Liquid Match the piping connection size of branch box with indoor unit. [9.52 mm] If the piping connection size of branch box does not match the piping connection size of {5/8 inch {3/4 inch* indoor unit, use optional different-diameter (deformed) joints to the branch box side.

  • Page 10: Specifications

    SPECIFICATIONS kcal/h = kW o 860 3-1. OUTDOOR UNIT: Conversion formula: BTU/h = kW o 3412 MXZ-4C36/5C42/8C48NAHZ(-U1), MXZ-8C48NA(-U1), MXZ-8C60NA-U1 /min o 35.31 Service Ref. MXZ-4C36NAHZ(-U1) MXZ-5C42NAHZ(-U1) Indoor type Non-Ducted Ducted Non-Ducted Ducted Capacity Rated* BTU/h 36,000 36,000 36,000 42,000 42,000...
  • Page 11 kcal/h = kW o 860 Conversion formula: BTU/h = kW o 3412 /min o 35.31 Service Ref. MXZ-8C48NAHZ(-U1) MXZ-8C48NA(-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* 4,000 4,465 5,050 4,000 4,465 5,050...
  • Page 12 kcal/h = kW o 860 Conversion formula: BTU/h = kW o 3412 /min o 35.31 Service Ref. MXZ-8C60NA-U1 Indoor type Non-Ducted Ducted Capacity Rated* BTU/h 60,000 60,000 60,000 Rated power consumption* 4,800 5,525 6,250 BTU/Wh 12.50 11.05 9.60 SEER BTU/Wh 17.4 16.3 15.1...
  • Page 13 3-2. BRANCH BOX: PAC-MKA50BC PAC-MKA51BC PAC-MKA30BC PAC-MKA31BC PAC-MKA50BC PAC-MKA30BC Model name PAC-MKA51BC PAC-MKA31BC 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 inch (mm) 17-23/32 (450) Width Dimensions...

  • Page 14: 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 15 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 16 <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) 13.6 kBTU/h Cooling Load Room2 Indoor Design Dry Bulb Temperature 75.2ºF (24.0ºC) Indoor Design Wet Bulb Temperature 66.2ºF (19.0ºC)
  • Page 17 <Heating> Design Condition Outdoor Design Wet Bulb Temperature 35.6ºF (2.0ºC) Total Heating Load 34.4 kBTU/h Room1 Indoor Design Dry Bulb Temperature 69.8ºF (21.0ºC) Heating Load 16.3 kBTU/h Room2 Indoor Design Dry Bulb Temperature 73.4ºF (23.0ºC) Heating Load 18.1 kBTU/h <Other> Indoor/Outdoor Equivalent Piping Length 230 ft Capacity of indoor unit Model Number for indoor...
  • Page 18 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 Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp.
  • Page 19 <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. 26.6°F [−3°C] W.B., Indoor temp. 68.0°F [20°C] D.B.) 1.34 (Refer to “4-2. CORRECTING BY TEMPERATURE”.) Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp.
  • Page 20 4-2. CORRECTING BY TEMPERATURE MXZ-4C36/5C42/8C48NA(HZ), 8C60NA could 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. Figure 7 Indoor unit temperature correction <Cooling> To be used to correct indoor unit capacity only 4C36 5C42 BTU/h...
  • Page 21 <Heating> Figure 9 Indoor unit temperature correction To be used to correct indoor unit capacity only 8C48NA 8C60NA BTU/h 54,000 66,000 Nominal heating capacity Input 4.22 5.67 60.8 62.6 64.4 66.2 69.8 71.6 73.4 75.2 78.8 80.6 [°F W.B.] [°C W.B.] Indoor Temperature Figure 10 Outdoor unit temperature correction To be used to correct outdoor unit capacity only...
  • Page 22 <Heating> (NAHZ) Figure 11 Indoor unit temperature correction To be used to correct indoor unit capacity only 4C36NAHZ 5C42NAHZ 8C48NAHZ Nominal heating BTU/h 45,000 48,000 54,000 capacity Input 3.34 3.43 4.22 60.8 62.6 64.4 66.2 69.8 71.6 73.4 75.2 78.8 80.6 [°F W.B.] [°C W.B.] Indoor Temperature...
  • Page 23 4-3. STANDARD OPERATION DATA (REFERENCE DATA) Outdoor unit model Operation MXZ-4C36NAHZ MXZ-5C42NAHZ Indoor Ambient 80°F/67°F 70°F/60°F 80°F/67°F 70°F/60°F 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 24 Before calculating the sum of total capacity of indoor units, please convert the value into the kW model capacity following the formula on "4-1. Method for obtaining system cooling and heating capacity". 4-4-1. MXZ-4C36NAHZ <cooling> 4C36NAHZ Nominal cooling capacity BTU/h...
  • Page 25 4-4-2. MXZ-4C36NAHZ <heating> 4C36NAHZ Nominal cooling capacity BTU/h 45,000 Input 3.34 Current (208V) 16.4 Current (230V) 14.8 Total capacity of indoor units (kBTU/h) Total capacity of indoor units (kBTU/h) 208, 230 V Total capacity of indoor units (kBTU/h) OCH573C...
  • Page 26 4-4-3. MXZ-5C42NAHZ <cooling> 5C42NAHZ Nominal cooling capacity BTU/h 42,000 Input 3.13 Current (208V) 15.4 Current (230V) 14.0 Total capacity of indoor units (kBTU/h) Total capacity of indoor units (kBTU/h) 208, 230 V Total capacity of indoor units (kBTU/h) OCH573C...
  • Page 27 4-4-4. MXZ-5C42NAHZ <heating> 5C42NAHZ Nominal cooling capacity BTU/h 48,000 Input 3.43 Current (208V) 16.8 Current (230V) 15.2 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 22.5 30.0 37.5...
  • Page 28 4-4-5. MXZ-8C48NA MXZ-8C48NAHZ <cooling> 8C48NAHZ Nominal cooling capacity BTU/h 48,000 Input 4.00 Current (208V) 19.5 Current (230V) 17.6 Total capacity of indoor units (kBTU/h) Total capacity of indoor units (kBTU/h) 208, 230 V Total capacity of indoor units (kBTU/h) OCH573C...
  • Page 29 4-4-6. MXZ-8C48NA MXZ-8C48NAHZ <heating> 8C48NA(HZ) Nominal cooling capacity BTU/h 54,000 Input 4.22 Current (208V) 20.5 Current (230V) 18.6 Total capacity of indoor units (kBTU/h) Total capacity of indoor units (kBTU/h) 208, 230 V Total capacity of indoor units (kBTU/h) OCH573C...
  • Page 30 4-4-7. MXZ-8C60NA <cooling> 8C60NA Nominal cooling capacity BTU/h 60,000 Input 4.80 Current (208V) 24.1 Current (230V) 21.8 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 Total capacity of indoor units(kBTU/h) 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 Total capacity of indoor units(kBTU/h) 208, 230 V 10.0...
  • Page 31 4-4-8. MXZ-8C60NA <heating> 8C60NA Nominal cooling capacity BTU/h 66,000 Input 5.67 Current (208V) 28.5 Current (230V) 25.7 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 Total capacity of indoor units(kBTU/h) 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 Total capacity of indoor units(kBTU/h) 208 V, 230 V 208, 230 V...
  • Page 32 (2) During heating, find the equivalent piping length, and find the capacity ratio corresponding to standard piping length from Figure 17. Then multiply by the heating capacity from Figure 9 to 12 in "4-2. CORRECTION BY TEMPERATURE" to obtain the actual capacity. (1) Capacity Correction Curve Figure 13 MXZ-4C36NAHZ <Cooling> Total capacity of indoor unit 1.00 18 [kBTU/h] 0.95...
  • Page 33 Figure 15 MXZ-8C48NA <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-8C60NA <Cooling> Total capacity of indoor unit 1.00 30 [kBTU/h] 0.95 0.90 45 [kBTU/h]...
  • Page 34 Figure 17 MXZ-4C36NAHZ/5C42NAHZ/8C48NA <Heating> Total capacity of indoor unit 1.00 0.95 0.90 0.85 0.80 0.75 0.70 Piping equivalent length (ft) Figure 18 MXZ-8C60NA <Heating> Total capacity of indoor unit 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 for type P60 = (length of piping to farthest indoor unit) + (0.3 o number of bends in the piping) (m)
  • Page 35 MICROPHONE 4-6. NOISE CRITERION CURVES 3.3 ft (1 m) UNIT MXZ-4C36NAHZ SPL(dB) MXZ-5C42NAHZ MODE LINE SPL(dB) MODE LINE COOLING MXZ-4C36NAHZ-U1 COOLING MXZ-5C42NAHZ-U1 HEATING HEATING 5 ft (1.5 m) GROUND NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE...

  • Page 36: Outlines And Dimensions

    OUTLINES AND DIMENSIONS 5-1. OUTDOOR UNIT MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ MXZ-8C48NA Unit: mm <inch> OCH573C...
  • Page 37 MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1 MXZ-8C48NA-U1 Unit: mm <inch> OCH573C...
  • Page 38 MXZ-8C60NA-U1 Unit: mm <inch> OCH573C...
  • Page 39 5-2. BRANCH BOX Unit: mm <inch> PAC-MKA50BC PAC-MKA51BC When installing the conduit. Set the attachment to the inner side of each panel. 58 〈2-9/32〉 SUSPENSION BOLT PITCH 320〈12-19/32〉 〈25/32〉 〈1-3/32〉 SUSPENSION BOLT : W3/8(M10) REFRIGERANT PIPE FLARED CONNECTION Unit: inch TO OUTDOOR UNIT LIQUID PIPE 1/4F...

  • Page 40: Wiring Diagram

    WIRING DIAGRAM 6-1. OUTDOOR UNIT MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block 〈Power Supply〉 Thermistor〈Suction Pipe〉 Switch〈Function Selection〉 Terminal Block 〈Branch Box〉 TB1B Thermistor〈Ambient〉 Switch〈Model Selection〉 Terminal Block Thermistor〈Heat Sink〉 Switch〈Function Selection〉 〈Branch box/Outdoor Transmission Line〉...
  • Page 41 MXZ-8C48NA SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block 〈Power Supply〉 Thermistor〈Ambient〉 Switch〈Function Selection〉 Terminal Block 〈Branch Box〉 TB1B Thermistor〈Heat Sink〉 Switch〈Model Selection〉 Terminal Block LEV-A,LEV-B Electronic Expansion Valve Switch〈Function Selection〉 〈Branch box/Outdoor Transmission Line〉 Reactor SWU1 Switch〈Unit Address Selection, 1st digit〉 Terminal Block P.B.
  • Page 42 MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1 OCH573C...
  • Page 43 MXZ-8C48NA-U1 OCH573C...
  • Page 44 MXZ-8C60NA-U1 OCH573C...
  • Page 45 6-2. BRANCH BOX PAC-MKA50BC PAC-MKA30BC OCH573C...
  • Page 46 PAC-MKA51BC PAC-MKA31BC OCH573C...

  • Page 47: Necessary Conditions For System Construction

    NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION 7-1. TRANSMISSION SYSTEM SETUP OCH573C...

  • Page 48: Heating

    7-2. REFRIGERANT SYSTEM DIAGRAM MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1 Thermistor(TH-A–E) Thermistor(TH7) <Gas pipe temperature> Service port <Ambient> Service port 4-Way Valve (21S4) Strainer Room temperature Ball valve High pressure thermistor Oil separator Solenoid valve(SV1) switch(63H) (TH1 or RT11) <Bypass>...
  • Page 49 MXZ-8C60NA-U1 Thermistor(TH-A–E) Thermistor(TH7) <Gas pipe temperature> Service port <Ambient> Service port 4-Way Valve (21S4) Strainer Room temperature High pressure Ball valve thermistor Oil separator Solenoid valve(SV1) switch(63H) (TH1 or RT11) <Bypass> Strainer Capillary Distributor tube1 Service port Strainer Thermistor(TH3) High <Outdoor Liquid pipe>...
  • Page 50 7-3. TYPICAL CONTROL SYSTEM IMPORTANT: TB3A TB5/TB15 Branch Box A-IC Make sure that the current leakage breaker is one compatible with higher MA-RC (01) (51) harmonics. Always use a current leakage breaker that is compatible with higher harmon- TB3B TB5/TB15 M1 M2 S M1 M2 S A-IC MA-RC...
  • Page 51 ( 5) Group setting 1 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 52: 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 53 8-2. CHECK POINTS 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 54 8-2-2. Test run for wired remote controller <PAR-31MAA> MENU RETURN SELECT ON/OFF Function buttons Select "Service" from the Main menu, and press the button. Test run Input maintenance info. Function setting Check Self check Select "Test run" with the F1 or F2 button, and press the button.
  • Page 55 8-2-3. Test run (1) Using remote controller Refer to the indoor unit installation manual. • Be sure to perform the test run individually for each indoor unit. Make sure each indoor unit operates properly following the installation manual attached to the unit. If you perform the test run for indoor units connected all at once, faulty connections of the refrigerant pipes and cables can- not be detected.
  • Page 56 (2) Using SW3 in outdoor unit In case of the test run from outdoor unit, all indoor units operate. Therefore, you cannot detect any erroneous con- nection 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 57 8-2-4. Countermeasures for Error During Test Run • If a problem occurs during test run, a code number will appear on the remote controller (or LED on the outdoor unit), and the air conditioning system will automatically cease operating. Determine the nature of the abnormality and apply corrective measures. Detected Unit Check Check...

  • Page 58: Serial Communication Error

    8-3. SELF-DIAGNOSIS ACTION BY FLOWCHART Check code 0403 Serial communication error (Ed) Abnormal points and detection methods Causes and check points Abnormal if serial communication between the outdoor controller board Wire breakage or contact failure of connector CN2 or and outdoor power board is defective. Malfunction of power board communication circuit on outdoor controller board Malfunction of communication circuit on outdoor...

  • Page 59: Heating

    Check code Compressor temperature trouble 1102 (U2) Chart 1 of 2 Abnormal points and detection methods Causes and check points (1) Abnormal 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 60 Check code Compressor temperature trouble 1102 (U2) Chart 2 of 2 ●Diagnosis of defectives 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 61 Check code High pressure trouble 1302 (UE) Chart 1 of 4 Abnormal points and detection methods Causes and check points (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 62 Check code High pressure trouble 1302 (UE) Chart 2 of 4 ●Diagnosis of defectives 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 63 Check code High pressure trouble 1302 (UE) Chart 3 of 4 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Is there a resistance detected? Replace the TH7.
  • Page 64 Check code High pressure trouble 1302 (UE) Chart 4 of 4 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Is there a resistance detected? Replace the SV1.
  • Page 65 Check code Superheat due to low discharge temperature trouble 1500 (U7) Chart 1 of 2 Abnormal points and detection methods Causes and check points Abnormal if the discharge superheat is continuously detected -27°F [−15 ](*) or Disconnection or loose connection of TH4 less for 5 minutes even though the indoor LEV has minimum open pulse Defective holder of TH4 after the compressor starts operating for 10 minutes.
  • Page 66 Check code Superheat due to low discharge temperature trouble 1500 (U7) Chart 2 of 2 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Is there a resistance detected? Replace the indoor LEV.
  • Page 67 Check code Refrigerant shortage trouble 1501 (U2) Chart 1 of 2 Abnormal points and detection methods Causes and check points (1) Abnormal when all of the following conditions are satisfied for 15 Defective operation of stop valve (not fully open) consecutive minutes: Defective thermistor 1.
  • Page 68 Check code Refrigerant shortage trouble 1501 (U2) Chart 2 of 2 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Continued from the previous page Is there a resistance detected? Replace the thermistor.
  • Page 69 Check code Closed valve in cooling mode 1501 (U2) Abnormal points and detection methods Causes and check points Abnormal if stop valve is closed during cooling operation. Outdoor liquid/gas valve is closed. Mulfunction of outdoor LEV (LEV-A) (blockage) Abnormal when both of the following temperature conditions are satisfied for 20 minutes or more during cooling operation.

  • Page 70: Way Valve Trouble In Heating Mode

    Check code 4-way valve trouble in heating mode 1508 (EF) Abnormal points and detection methods Causes and check points Abnormal if 4-way valve does not operate during heating operation. 4-way valve failure Disconnection or failure of 4-way valve coil Abnormal when any of the following temperature conditions is satisfied for Clogged drain pipe 3 minutes or more during heating operation Disconnection or loose connection of connectors...
  • Page 71 Check code Compressor current interruption (Locked compressor) 4100 (UF) Chart 1 of 2 Abnormal points and detection methods Causes and check points Abnormal if overcurrent of DC bus or compressor is detected before 30 Closed stop valve seconds after the compressor starts operating. Decrease of power supply voltage Looseness, disconnection, or wrong phase of compressor wiring connection...
  • Page 72 Check code Compressor current interruption (Locked compressor) 4100 (UF) Chart 2 of 2 ●Diagnosis of defectives 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 73 Check code Compressor overcurrent interruption 4210 (UP) Chart 1 of 2 Abnormal points and detection methods Causes and check points Abnormal if overcurrent of DC or the compressor is detected after 30 Closed outdoor stop valve seconds since the compressor starts operating. Decrease of power supply voltage Looseness, disconnection or reverse phase of compressor wiring connection...
  • Page 74 Check code Compressor overcurrent interruption 4210 (UP) Chart 2 of 2 ●Diagnosis of defectives 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 75 Check code Voltage shortage /Overvoltage/PAM error/L1 open phase/ 4220 Primary current sensor error/Power synchronization signal error (U9) Chart 1 of 2 Abnormal points and detection methods Causes and check points Abnormal if any of following symptoms are detected; Decrease/increase of power supply voltage 2 Primary current sensor failure ●Decrease of DC bus voltage to 200V Disconnection of compressor wiring...
  • Page 76 Check code Voltage shortage /Overvoltage/PAM error/L1 open phase/ 4220 Primary current sensor error/Power synchronization signal error (U9) Chart 2 of 2 ●Diagnosis of defectives 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 77 Check code Heat sink temperature trouble 4230 (U5) Abnormal points and detection methods Causes and check points Abnormal 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>...
  • Page 78 Check code Power module trouble or overcurrent trouble 4250 (U6) Abnormal points and detection methods Causes and check points Abnormal 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 79 Check code Fan trouble 4400 (U8) Abnormal points and detection methods Causes and check points Abnormal if no rotational frequency is detected, or detected a value Malfunction of fan motor outside the specified range during fan motor operation. Disconnection of CNF connector Defective outdoor multi controller circuit board ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
  • Page 80 Check code Compressor temperature thermistor (TH4) open/short 5101 (U3) <Detected in outdoor unit> Abnormal points and detection methods Causes and check points Abnormal if TH4 detects 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 81 Check code Suction pipe temperature thermistor (TH6) open/short 5102 (U4) <Detected in outdoor unit> Abnormal points and detection methods Causes and check points Abnormal if TH6 detects 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 82 Check code 5105 Outdoor liquid pipe temperature thermistor (TH3) open/short (U4) Abnormal points and detection methods Causes and check points Abnormal if TH3 detects 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 83 Check code Ambient temperature thermistor (TH7) open/short 5106 (U4) Abnormal points and detection methods Causes and check points Abnormal if TH7 detects to be open/short Disconnection or contact failure of connectors Open: −40°F [-40 ] or less Characteristic defect of thermistor Short: 194°F [90 ] or more TH7: Thermistor <Ambient>...
  • Page 84 Check code HIC pipe temperature thermistor (TH2) open/short 5109 (U4) Abnormal points and detection methods Causes and check points Abnormal if TH2 detects to be open/short. Disconnection or contact failure of connectors Open: –40°F [–40 ] or less Characteristic defect of thermistor Short: 194°F [90 ] or more TH2: Thermistor <HIC pipe>...
  • Page 85 Check code Heat sink temperature thermistor (TH8) open/short 5110 (U4) Abnormal points and detection methods Causes and check points Abnormal if TH8 detects to be open/short. Disconnection or contact failure of connectors Open: −31.2°F [−35.1 ] or less Characteristic defect of thermistor Short: 338.5°F [170.3 ] or more Defective outdoor multi controller circuit board TH8: Thermistor <Heat sink>...
  • Page 86 Check code High pressure sensor (63HS) trouble 5201 (F5) Abnormal points and detection methods Causes and check points When the detected pressure in the high pressure sensor is 14.2 PSIG Defective high pressure sensor [1 kgf/F] 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 87 Check code Low pressure sensor (63LS) trouble 5202 (F3) Abnormal points and detection methods Causes and check points When the detected pressure in the low pressure sensor is −32.7 Defective low pressure sensor PSIG [−2.3kgf/F] or less, or 328.6 PSIG [23.1kgf/F] or more during Decrease of internal pressure caused by gas operation, the compressor stops operation with a check code <5202>.
  • Page 88 Check code Current sensor trouble/Primary current error 5300 (UH) Abnormal points and detection methods Causes and check points Abnormal if any of the following conditions is detected: Decrease/trouble of power supply voltage 1 Primary current sensor detects any of the following conditions (single Disconnection of compressor wiring phase unit only): Current sensor trouble on outdoor power circuit...

  • Page 89: Duplex Address Error

    Check code Duplex address error 6600 (A0) Abnormal points and detection methods Causes and check points Abnormal 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 defectives...
  • Page 90 Check code Transmission processor hardware error 6602 (A2) Abnormal points and detection methods Causes and check points Abnormal if the transmission line shows "1" although the transmission A transmitting data collision occurred because of a processor 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 91: Transmission Bus Busy Error

    Check code Transmission bus BUSY error 6603 (A3) Abnormal points and detection methods Causes and check points Over error by collision The transmission processor is unable to transmit due Abnormal if no-transmission status caused by a transmitting data to a short-cycle voltage such as noise is mixed on collision is consecutive for 8 to 10minutes.

  • Page 92: Signal Communication Error With Transmission Processor

    Check code Signal communication error with transmission processor 6606 (A6) Abnormal points and detection methods Causes and check points Abnormal if the data of unit/transmission processor were not normally Accidental disturbance such as noise or lightning transmitted. surge Hardware malfunction of transmission processor Abnormal if the address transmission from the unit processor was not normally transmitted.
  • Page 93 Check code No ACK error 6607 (A7) Chart 1 of 4 Abnormal points and detection methods Causes and check points 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 94 Check code No ACK error 6607 (A7) Chart 2 of 4 Abnormal points and detection methods Causes and check points While the indoor unit is operating with multi refrigerant system Fresh Master, an abnormality The cause of displayed address and attribute is on the Fresh Master is detected when the indoor unit transmits signal side to the remote controller while the outdoor unit with...
  • Page 95 Check code No ACK error 6607 (A7) Chart 3 of 4 ●Diagnosis of defectives Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards. Diagnosis Remedy Procedure 1: Turn the power OFF of indoor/outdoor unit, Fresh Master, Lossnay and remote controller simultaneously for 2 minutes or more, then turn the power back ON.
  • Page 96 Check code No ACK error 6607 (A7) Chart 4 of 4 ●Diagnosis of defectives 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 97: No Response Frame Error

    Check code No response frame error 6608 (A8) Abnormal points and detection methods Causes and check points Abnormal 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 98 Check code MA communication receive error 6831(E0/E4) 6834(E0/E4) Chart 1 of 2 Abnormal points and detection methods Causes and check points 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 99 Check code MA communication receive error 6831(E0/E4) 6834(E0/E4) Chart 2 of 2 ●Diagnosis of defectives 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 100 Check code MA communication send error 6832(E3/E5) 6833(E3/E5) Chart 1 of 2 Abnormal points and detection methods Causes and check points 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 101 Check code MA communication send error 6832(E3/E5) 6833(E3/E5) Chart 2 of 2 ●Diagnosis of defectives 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 102: Total Capacity Error

    Check code Total capacity error 7100 (EF) Abnormal points and detection methods Causes and check points 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 103: Capacity Code Error

    Check code Capacity code error 7101 (EF) Abnormal points and detection methods Causes and check points 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.

  • Page 104: Connecting Excessive Number Of Units And Branch Boxes

    Check code Connecting excessive number of units and branch boxes 7102 (EF) Abnormal points and detection methods Causes and check points When the connected indoor units or branch boxes exceed the limit, a Connecting more indoor units and branch boxes than check code <7102>...

  • Page 105: Address Setting Error

    Check code Address setting error 7105 (EF) Abnormal points and detection methods Causes and check points 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 106 Check code Incompatible unit combination 7130 (EF) Abnormal points and detection methods Causes and check points When the connected indoor unit is not connectable 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 107 8-4. TROUBLESHOOTING BY INFERIOR PHENOMENA Phenomena Factor Countermeasure 1. Remote controller display works 1 Refrigerant shortage 1 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 108 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 : Error display lamp : Compressor operation lamp X, Y: Relay (Coil standard of 0.9W or less for 12 V DC) X, Y: Relay (1mA DC)
  • Page 109 8-6. HOW TO CHECK THE PARTS OUTDOOR UNIT: MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ MXZ-8C48NA MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1 MXZ-8C48NA-U1 MXZ-8C60NA-U1 Parts name Check points Thermistor (TH3) Disconnect the connector then measure the resistance with a tester. (At the ambient temperature 50 to 80˚F [10 to 30 :]) <Outdoor liquid pipe>...
  • Page 110 Check method of DC fan motor (fan motor/outdoor multi controller circuit board) Notes 1. High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay attention to the service. 2. 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 Self check...
  • Page 111 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 Replace multi controller circuit board (MULTI. B.) Did the fuse (F500) blow? measure the resistance of connector pins.
  • Page 112 Check method of power circuit board Power circuit board check Note: To check the voltage of the parts on this board with a tester is difficult due to its location. Test points are limited. Is the voltage of main incoming power •...
  • Page 113 Check method of M-NET power circuit board M-NET power circuit board check * To check the voltage of the parts on this board with a tester is difficult due to its location. Test points are limited. Check the voltage between M1 and M2 on the transmission terminal block TB3.
  • Page 114 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 k" ± 3 % B constant = 3480 ±...

  • Page 115: Low Pressure Sensor

    <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 116: High Pressure Sensor

    <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 117 BRANCH BOX: PAC-MKA50BC PAC-MKA51BC PAC-MKA30BC PAC-MKA31BC Parts name Check points Disconnect the connector then measure the resistance with a tester. Thermistor (TH-A–E) (At the ambient temperature 50 to 86°F [10 to 30:]) <Gas pipe> Normal Abnormal 4.3 to 9.6k" Open or short Disconnect the connector then measure the resistance with a tester.
  • Page 118 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 119 (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 120 Troubleshooting Check point Corrective measure Problem 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 121 8-8. TEST POINT DIAGRAM Outdoor multi controller circuit board MXZ-4C36NAHZ MXZ-5C42NAHZ MXZ-8C48NAHZ MXZ-8C48NA MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1 MXZ-8C48NA-U1 MXZ-8C60NA-U1 <CAUTION> TEST POINT 1 is high voltage. CN51 External signal Model selection Pump down Test run Manual defrost Model selection output CN102 Connect to the M-P.B...
  • Page 122 Outdoor power circuit board Brief Check of POWER MODULE Usually, they are in a state of being short-circuited if they are broken. MXZ-4C36NAHZ Measure the resistance in the following points (connectors, etc.). MXZ-5C42NAHZ If they are short-circuited, it means that they are broken.
  • Page 123 M-NET power circuit board Connect to the outdoor multi MXZ-4C36NAHZ controller circuit board (CN102) 1–2: 24–30 V DC MXZ-5C42NAHZ 3–4: 24–30 V DC MXZ-8C48NAHZ MXZ-8C48NA MXZ-4C36NAHZ-U1 MXZ-5C42NAHZ-U1 MXZ-8C48NAHZ-U1 MXZ-8C48NA-U1 MXZ-8C60NA-U1 Connect to the electrical parts box Connect to the outdoor power circuit board (CNAC1) 1–3: 220–240 V AC...
  • Page 124 Branch box controller board PAC-MKA50BC PAC-MKA51BC PAC-MKA30BC PAC-MKA31BC 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-MKA50/51BC only LEV-D and E for PAC-MKA50/51BC only CN3M Connected to the terminal block (TB5) (M-NET transmission con- necting wire)
  • Page 125 8-9. INTERNAL SWITCH FUNCTION TABLE (1) Function of switches MXZ-4C36NAHZ(-U1) MXZ-5C42NAHZ(-U1) MXZ-8C48NAHZ(-U1) MXZ-8C48NA(-U1) MXZ-8C60NA-U1 ■ The black square ( ) indicates a switch position. Continue to the next page OCH573C...
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  • Page 127 PAC-MKA50BC PAC-MKA51BC PAC-MKA30BC PAC-MKA31BC ■ The black square ( ) indicates a switch position. OCH573C...
  • Page 128 SW:setting 0..OFF 8-10. OUTDOOR UNIT FUNCTIONS 1..ON OCH573C...
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  • Page 136 8-11. BRANCH BOX UNIT OPERATION MONITOR FUNCTION [When option 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 137 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 138 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/ 2 3 4 5 6 (When the temperature is 0 or less, "−"...
  • Page 139 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 140: 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 141: Disassembly Procedure

    DISASSEMBLY PROCEDURE 10-1. OUTDOOR UNIT Note: Turn OFF the power supply before disassembly. MXZ-4C36NAHZ(-U1) MXZ-5C42NAHZ(-U1) MXZ-8C48NAHZ(-U1) OPERATING PROCEDURE PHOTOS & ILLUSTRATION 1. Removing the service panel and top panel Top panel fixing screws Top panel Photo 1 (1) Remove 3 service panel fixing screws (5 × 12), then slide the hook on the right downward to remove the service panel.
  • Page 142 From the previous page. OPERATING PROCEDURE PHOTOS Photo 5 (6) Remove 2 electrical parts box fixing screws (4 × 10), then Electrical parts box 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 143: Heating

    PHOTOS OPERATING PROCEDURE 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 elec- trical parts box.
  • Page 144 OPERATING PROCEDURE PHOTOS 9. Removing bypass valve coil (SV1, SV2) and bypass valve Photo 11 (1) Remove the service panel. (See Photo 1) Electronic expansion Electronic expansion Bypass valve (2) Remove the top panel. (See Photo 1) valve coil (LEV-B) valve coil (LEV-A) coil fixing screw (3) Remove the cover panel (front).
  • Page 145 OPERATING PROCEDURE PHOTOS & ILLUSTRATION 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) Valve bed (3) Remove 2 front cover panel fixing screws (5 × 12) and fixing screw remove the front cover panel.
  • Page 146 PHOTOS & ILLUSTRATION OPERATING PROCEDURE 15. Removing the reactor (DCL) Figure 3 (1) Remove the service panel. (See Photo 1) Electrical parts box (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box (See photo 5) (4) Remove 4 screws for reactor (4 x 10) to remove the reac- tor.
  • Page 147 MXZ-8C48NA MXZ-8C48NA-U1 Note: Turn OFF the power supply before disassembly. PHOTOS & ILLUSTRATION OPERATING PROCEDURE Figure 1 1. Removing the service panel and top panel Top panel fixing screws Top panel (1) Remove 3 service panel fixing screws (5 × 12) and slide Service panel the hook on the right downward to remove the service fixing screw...
  • Page 148 From the previous page. PHOTOS OPERATING PROCEDURE Photo 4 (6) Remove 2 electrical parts box fixing screws (4 × 10) Electrical parts box and 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 149 PHOTOS OPERATING PROCEDURE Photo 8 6. Removing the thermistor <Outdoor liquid pipe> (TH3) and thermistor <Compressor> (TH4), thermistor <HIC pipe> (TH2) (1) Remove the service panel. (See Figure 1) (2) Disconnect the connectors, TH3 (white) and TH4 (white), TH2 (black) on the multi controller circuit board in the elec- trical parts box.
  • Page 150 OPERATING PROCEDURE PHOTOS 9. Removing bypass valve coil (SV1) and bypass valve Photo 10 (1) Remove the service panel. (See Figure 1) Electronic expansion Bypass valve Bypass valve (2) Remove the top panel. (See Figure 1) valve coil (LEV-B) coil fixing screw coil (SV1) (3) Remove the cover panel (front).
  • Page 151 OPERATING PROCEDURE PHOTOS & ILLUSTRATION 13. Removing the compressor (MC) Photo 13 (1) Remove the service panel. (See Figure 1) Valve bed (2) Remove the top panel. (See Figure 1) Valve bed (3) Remove 2 front cover panel fixing screws (5 × 12) and fixing screw remove the front cover panel.
  • Page 152 OPERATING PROCEDURE ILLUSTRATION Figure 4 15. Removing the reactor (DCL) (1) Remove the service panel. (See Figure 1) Electrical parts box (2) Remove the top panel. (See Figure 1) (3) Remove the electrical parts box (See photo 4) (4) Remove 4 screws for reactor (4 x 10) to remove the reac- tor.
  • Page 153 MXZ-8C60NA-U1 Note: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the service panel and top panel Top panel Photo 1 Top panel fixing screws (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service Service panel...
  • Page 154 From the previous page. OPERATING PROCEDURE PHOTOS (6) Remove 2 electrical parts box fixing screws (4 × 10) then Photo 5 detach the electrical parts box by pulling it upward. The electrical parts box is fixed with 2 hooks on the left and 1 Hooks Electrical hook on the right.
  • Page 155 OPERATING PROCEDURE PHOTOS 6. Removing the thermistors Photo 9-1 Thermistor <Low pressure Thermistor <HIC> (TH2) and thermistor <Compressor> saturated temp.> (TH4) (TH6) Thermistor (1) Remove the service panel. (See Photo 1) <Compressor> Thermistor (TH4) (2) Disconnect the connectors, TH2 (black) and TH4 (white), <HIC>...
  • Page 156 OPERATING PROCEDURE PHOTOS Thermistor 9. Removing bypass valve coil (SV1) and bypass valve Photo 11 Low pressure <Outdoor pipe> (1) Remove the service panel. (See Photo 1) sensor (63LS) (TH3) (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 & ILLUSTRATION 13. Removing the reactor (DCL) Figure 2 (1) Remove the service panel. (See Photo 1) Electrical parts box (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box (See photo 5) (4) Remove 4 screws for reactor (4 x 10) to remove the reac- tor.
  • Page 158 OPERATING PROCEDURE PHOTOS 15. 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 159 10-2. BRANCH BOX: PAC-MKA50BC PAC-MKA51BC PAC-MKA30BC PAC-MKA31BC PHOTO: PAC-MKA50/51BC OPERATING PROCEDURE PHOTOS 1. Removing the controller cover and under panel Photo 1 (1) Remove 3 controller cover fixing screws (4 o 10) to detach Under panel fixing screws the controller cover. (See Photo 1) (2) Remove 4 under panel fixing screws (4 o 10) to remove the under panel.
  • Page 160 OPERATING PROCEDURE PHOTOS 3. Removing the LEV coil (LEV-A–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 x 10).
  • Page 161 OPERATING PROCEDURE PHOTOS 5. Removing the LEV assy (1) Remove the controller cover. (See Photo 1) Photo 5-1 (2) Remove the under panel. (See Photo 1) (3) Remove 8 the insulations, then remove 9 pipe cover fixing LEV assy screws (4 x 10). (See Photo 2-1) (4) Loosen the side clamps, then disconnect the LEV connec- tors on the controller board.
  • Page 162 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN cCopyright 2014 MITSUBISHI ELECTRIC CORPORATION Issued: Oct. 2016 No.OCH573 REVISED EDITION-C Issued: Jun. 2016 No.OCH573 REVISED EDITION-B Issued: Oct. 2015 No.OCH573 REVISED EDITION-A Published: Aug. 2014 No.OCH573 Made in Japan...

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