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Mitsubishi Electronics PAC-AKA31BC manual

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Table of contents for the manual

  • Page 1

    TECHNICAL & SER VICE MANUAL SPLIT -TYPE, HEA T PUMP AIR CONDITIONERS CONTENTS 1. SAFETY PRECAUTION .................................... 2 2. OVERVIEW OF UNITS ...................................... 5 3. SPECIFICA TIONS ............................................. 9 4. DA T A ................................................................ 11 5[...]

  • Page 2

    2 1 SAFETY PRECAUTION Cautions for units utilizing refrigerant R410A 1-1. AL W A YS OBSERVE FOR SAFETY Use new refrigerant pipes. Charge refrigerant from liquid phase of gas cylinder . If the refrigerant is charged from gas phase, composition change may occur in refrigerant and the efficiency will be lowered. Do not use refrigerant other than R410A[...]

  • Page 3

    3 Gravimeter Unit [3] Service tools (1) Use the below service tools as exclusive tools for R410A refrigerant. No. T ool name Specifications 1 Gauge manifold ·Only for R410A ·Use the existing fitting specifications . (UNF1/2) ·Use high-tension side pressure of 5.3MPa·G or over . 2 Charge hose ·Only for R410A ·Use pressure performance of 5.09MP[...]

  • Page 4

    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 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 s[...]

  • Page 5

    5 2 OVER VIEW OF UNITS 2-1. CONSTRUCTION OF SYSTEM 6HP Rated capacity (kBTU/h) (Cooling/Heating) 48/54 MXZ-8B48NA R410A Indoor unit that can be connected Branch box that can be connected Capacity Number of units T otal system wide capacity T ype 06 ~ T ype 24 2 ~ 8 units 1 ~ 2 units 22.2 ~ 130 % of outdoor unit MAX. Cooling capacity (12 kBTU/h ~ 70[...]

  • Page 6

    6 Indoor unit (Ceiling concealed type) Indoor unit (W all mounted type) Outdoor unit Branch Box 2-2. SYSTEM OUTLINE The additional connection of the Branch Box together with employment of the compact trunk-looking outdoor unit can suc- cessfully realizes a long distance piping for big houses. Equipped with a microcomputer , the Branch Box can trans[...]

  • Page 7

    7 2-3. TYPICAL COMBINA TION 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 . Branch box (5 branch type) Outdoor unit SEZ-18 MSZ-12 MSZ-12 MSZ-09 MSZ-09 Living Dining Bedroom (1) Bedroom (2) Master bedroom Ind[...]

  • Page 8

    8 2-4. SIMPLIFIED PIPING SYSTEM Piping connection size Liquid Gas W 9.52 mm (3/8 inch) W 15.88 mm (5/8 inch) The piping connection size differs according to the type and capacity of indoor units. Match the piping connection size of branch box with indoor unit. If the piping connection size of branch box does not match the piping connection size of [...]

  • Page 9

    9 3 SPECIFICA TIONS • Outdoor unit : MXZ-8B48NA Conversion formula: kcal/h = kW % 860 Btu/h = kW % 3412 CFM = m 3 /min % 35.31 Service Ref. MXZ-8B48NA Standard performance Indoor type Non-Ducted Mix Ducted Cooling Capacity Rated / Max (*1) Btu/h 48000 / 54000 Rated power consumption (*1) W 5780 6125 6470 EER Btu/Wh 8.30 7.84 7.42 SEER Btu/Wh 15.0[...]

  • Page 10

    10 kW A mm (in.) mm (in.) mm (in.) mm (in.) kg (lbs) mm (in.) mm (in.) mm (in.) mm (in.) Model name Connectable number of indoor units Power supply (from outdoor unit) Input Running current External finish Drain hose size (on site) Dimensions Weight Piping connection (Flare) Wiring Width Depth Height Branch (indoor side) Main (outdoor side) To indo[...]

  • Page 11

    11 4 D ATA 4-1. CAP ACITY AND CHARACTERISTICS Note: • Cooling capacity is based on D.B. 26.7 °C / W .B. 19.4 °C (D.B. 80 °F / W .B. 67 °F) (indoor temperature), D.B. 35 °C (D.B. 95 °F) (outdoor temperature). • Heating capacity is based on D.B. 21.1 °C (D.B. 70 °F) (indoor temperature), D.B. 8.3 °C / W .B. 6.1 °C (D.B. 47 °F / W .B. 4[...]

  • Page 12

    12 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A Unit B Unit C Unit D Unit A Unit B Unit C Unit D 208V 230V 09 09 09 - 9000 9000 9000 - 27000 2540 12.4 1 1.2 09 09 12 - 9000 9000 12000 - 30000 2780 13.6 12.3 09 09 15 - 9000 9000 15000 - 33000 3010 14.7 13.[...]

  • Page 13

    13 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A Unit B Unit C Unit D Unit A Unit B Unit C Unit D 208V 230V 06 09 09 09 6000 9000 9000 9000 33000 3010 14.7 13.3 06 09 09 12 6000 9000 9000 12000 36000 3390 16.5 14.9 06 09 09 15 6000 9000 9000 15000 39000 39[...]

  • Page 14

    14 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E 208V 230V 09 12 24 24 - 7040 9390 18780 18780 - 53990 3680 17.9 16.2 09 15 15 15 - 9000 15000 15000 15000 - 54000 5400 26.3 23.8 09 15 15 18 - 8[...]

  • Page 15

    15 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E 208V 230V 06 06 09 12 24 5680 5680 8530 1 1370 22740 54000 4940 24.1 21.8 06 06 09 15 15 6000 6000 9000 15000 15000 51000 5620 27.4 24.8 06 06 0[...]

  • Page 16

    16 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A B C D E F Unit A Unit B Unit C Unit D Unit E Unit F 208V 230V 06 12 12 18 18 - 4910 9820 9820 14730 14730 - 54010 3930 19.2 17.3 06 12 15 15 15 - 5140 10290 12860 12860 12860 - 54010 4220 20.6 18.6 06 12 15 [...]

  • Page 17

    17 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A B C D E F Unit A Unit B Unit C Unit D Unit E Unit F 208V 230V 06 06 06 06 09 24 5680 5680 5680 5680 8530 22740 53990 4940 24.1 21.8 06 06 06 06 12 12 6000 6000 6000 6000 12000 12000 48000 5900 28.8 26.0 06 0[...]

  • Page 18

    18 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A B C D E F G Unit A Unit B Unit C Unit D Unit E Unit F Unit G 208V 230V 06 06 12 12 12 12 - 5400 5400 10800 10800 10800 10800 - 54000 4550 22.2 20.1 06 06 12 12 12 15 - 5140 5140 10290 10290 10290 12860 - 540[...]

  • Page 19

    19 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit Input (W) Outdoor unit current (A) Unit A B C D E F G Unit A Unit B Unit C Unit D Unit E Unit F Unit G 208V 230V 06 06 06 06 06 09 24 5140 5140 5140 5140 5140 7710 20570 53980 4220 20.6 18.6 06 06 06 06 06 12 12 6000 6000 6000 6000 6000 12000 12000 [...]

  • Page 20

    20 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit Input (W) Outdoor unit current (A) Unit A B C D E F G H Unit A Unit B Unit C Unit D Unit E Unit F Unit G Unit H 208V 230V 06 09 09 09 09 09 18 - 4700 7040 7040 7040 7040 7040 14090 - 53990 3680 17.9 16.2 06 09 09 09 09 12 12 - 4910 7360 7360 7360 73[...]

  • Page 21

    21 (2) Heating mode <Heating> Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A Unit B Unit C Unit A Unit B Unit C 208V 230V 06 - - 7200 - - 7200 720 3.5 3.2 09 - - 10900 - - 10900 1 100 5.4 4.9 12 - - 14400 - - 14400 1450 7.1 6.4 15 - - 18000 - - 18000 [...]

  • Page 22

    22 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A Unit B Unit C Unit D Unit A Unit B Unit C Unit D 208V 230V 09 09 09 - 10900 10900 10900 - 32700 3390 16.6 15.0 09 09 12 - 10900 10900 14400 - 36200 3790 18.5 16.7 09 09 15 - 10900 10900 18000 - 39800 4200 20[...]

  • Page 23

    23 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A Unit B Unit C Unit D Unit A Unit B Unit C Unit D 208V 230V 06 09 09 09 7200 10900 10900 10900 39900 4210 20.6 18.6 06 09 09 12 7200 10900 10900 14400 43400 4500 22.0 19.9 06 09 09 15 7200 10900 10900 18000 4[...]

  • Page 24

    24 <Heating> Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A Unit B Unit C Unit D Unit E Unit A Unit B Unit C Unit D Unit E 208V 230V 09 12 24 24 - 7890 10420 20840 20840 - 59990 3840 18.8 17.0 09 15 15 15 - 10080 16640 16640 16640 - 60000 4850 23.7 21[...]

  • Page 25

    25 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A B C D E Unit A Unit B Unit C Unit D Unit E 208V 230V 06 06 09 12 24 6310 6310 9550 12610 25230 60010 4610 22.5 20.4 06 06 09 15 15 7050 7050 10670 17620 17620 60010 5120 25.0 22.6 06 06 09 15 18 6660 6660 10[...]

  • Page 26

    26 <Heating> Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A B C D E F Unit A Unit B Unit C Unit D Unit E Unit F 208V 230V 06 12 12 18 18 - 5450 10910 10910 16360 16360 - 59990 4010 19.6 17.7 06 12 15 15 15 - 5710 1 1430 14290 14290 14290 - 60010 4190 [...]

  • Page 27

    27 <Heating> Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A B C D E F Unit A Unit B Unit C Unit D Unit E Unit F 208V 230V 06 06 06 06 09 24 6310 6310 6310 6310 9550 25230 60020 4610 22.5 20.4 06 06 06 06 12 12 7200 7200 7200 7200 14400 14400 57600 521[...]

  • Page 28

    28 <Heating> Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A B C D E F G Unit A Unit B Unit C Unit D Unit E Unit F Unit G 208V 230V 06 06 12 12 12 12 - 6000 6000 12000 12000 12000 12000 - 60000 4390 21.4 19.4 06 06 12 12 12 15 - 5710 5710 1 1430 1 1430[...]

  • Page 29

    29 Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit input (W) Outdoor unit current (A) Unit A B C D E F G Unit A Unit B Unit C Unit D Unit E Unit F Unit G 208V 230V 06 06 06 06 06 09 24 5710 5710 5710 5710 5710 8640 22830 60020 4190 20.5 18.5 06 06 06 06 06 12 12 6670 6670 6670 6670 6670 13330 13330 [...]

  • Page 30

    30 <Heating> Indoor unit combinations Capacity of each unit (BTU/h) T otal rated capacity (BTU/h) Outdoor unit Input (W) Outdoor unit current (A) Unit A B C D E F G H Unit A Unit B Unit C Unit D Unit E Unit F Unit G Unit H 208V 230V 06 09 09 09 09 09 18 - 5190 7850 7850 7850 7850 7850 15560 - 60000 3840 18.8 17.0 06 09 09 09 09 12 12 - 5430 8[...]

  • Page 31

    31 4-2. CORRECTING COOLING AND HEA TING CAP ACITY 4-2-1. Correcting Changes in Air Conditions (1)The performance curve charts (Figure 1-1, 1-2, 2-1, 2-2) show the change ratio of capacity and input (power consumption) according to the indoor and outdoor temperature condition when define the rated capacity (total capacity) and rated input under the [...]

  • Page 32

    32 4-2-2. Correcting Capacity for Changes in the Length of Refrigerant Piping T o obtain the ratio (and the corrected piping length) of the outdoor units Max. capacity and the total in-use indoor capacity , first find the capacity ratio corresponding to the standard piping length from Fig.3, Fig.4 and then multiply by the capacity from Fi g. 1-1, 1[...]

  • Page 33

    33 1.5m (5ft) 1m(3.3ft) MICROPHONE UNIT GROUND 4-3. NOISE CRITERION CURVES 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMA TE THRESHOLD OF HEARING FOR CONTINUOUS NOISE OCT A VE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μ bar) BAND CENTER FREQUENCIES, Hz NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 MXZ-8B48NA COOLING MODE HEA TING[...]

  • Page 34

    34 5 OUTLINES AND DIMENSIONS 5-1. OUTDOOR UNIT unit : mm (inch) MXZ-8B48NA Min.500mm <19-11/16> Min.500mm <19-11/16> Min.150mm <5-29/32> Min.10mm<3/8> Handle Side Air Intake Front piping cover Rear piping cover Air intake Rear Air Intake Handle 31<1-7/32> 74<2-19/32> 40<1-9/16> Max. 30mm<1-3/16> The d[...]

  • Page 35

    35 unit : mm (inch) 5-2. BRANCH BOX UNIT P AC-AKA51BC P AC-AKA31BC TB3D TB3E TB3A TB3B TB3C TB2B 3- W 22<7/8> 58 <2-1/4> 56 <2-1/4> 192 <7-1/2> When installing the conduit. Set the attachment to the inner side of each panel. CONDUIT PLA TE 3-WIRE BAND 35 <1-3/8> 68 70 55 <2-1/8> 79 61 450 <17-3/4> 91 <3-[...]

  • Page 36

    36 6 WIRING DIAGRAM 6-1. OUTDOOR UNIT MXZ-8B48NA The black square ( ■ ) indicates a switch position. (L2-Phase) (L1-Phase)[...]

  • Page 37

    37 6-2. BRANCH BOX : P AC-AKA51BC P AC-AKA31BC + Setup of SW1 Make it the same setup as former when exchanging PCB. The black square ( ■ ) indicates a switch position.[...]

  • Page 38

    38 A A A BB BB B 2 branches pipe (joint) : optional parts Branch box #1 Branch box #2 ■ In case of using 2-branch boxes A BB B B B Branch box 7 NECESSAR Y CONDITIONS FOR SYSTEM CONSTRUCTION REFRIGERANT SYSTEM DIAGRAM MXZ-8B48NA Piping connection size Thermistor TH6 (Pipe temperature : condenser) Thermistor TH7 (Outdoor temperature) Thermistor TH3[...]

  • Page 39

    39 8 TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the wired remote controller and control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized[...]

  • Page 40

    40 8-2. CHECK POINTS FOR TEST RUN 8-2-1. Before test run T urn on the main power switch more than 12 hours before starting operation. Starting operation just after turning on the power switch can severely damage the internal parts. Keep the main power switch turned on during the operation season. After completing installation and the wiring and pip[...]

  • Page 41

    41 8-2-3. T est run by outdoor unit SW4 The setting of test run (ON/OFF) and its operation mode (cooling/heating) can be set by SW4 on the controller board of out- door unit. 1 Set operation mode (cooling or heating) by SW4-2. 2 Start test run by setting SW4-1 to ON ( ) with the indicated operation mode of SW4-2. 3 Finish test run by setting SW4-1 [...]

  • Page 42

    42 8-3. SELF-DIAGNOSIS ACTION T ABLE <Abnormalities detected when the power is put on> (Note 1) Refer to indoor unit section for code P and code E. Error Code Abnormal point and detection method Case Judgment and action None — 1 No voltage is supplied to termi- nal block (TB1) of outdoor unit. a) Power supply breaker is turned off. b) Conta[...]

  • Page 43

    43 Error Code Abnormal point and detection method Judgment and action Eb (6845) Miswiring of indoor–branch box/branch box–outdoor unit connecting wire (converse wiring or dis- connection) Outdoor/branch box controller circuit board can automatically set the unit number of indoor units. Abnormal if the indoor unit number can not be set within 4 [...]

  • Page 44

    44 Error Code Abnormal point and detection method Judgment and action U1 (1302) (1) High-pressure switch (63H) operated Abnormal if high-pressure switch 63H oper- ated ( w ) during compressor operation. w 4.15 MPa [602PSIG] 63H: High-pressure switch (2) High pressure (High - pressure sensor 63HS detect) 1 When high-pressure sensor detects 4.31MPa [[...]

  • Page 45

    45 U2 (1 102) (1) High discharging temperature Abnormal if discharge temperature ther- mistor (TH4) exceeds 125 : [257°F] or 11 0 : [230°F] continuously for 5 minutes. Abnormal if pressure detected by high pressure sensor and converted to satura- tion temperature exceeds 40 : [104°F] during defrosting and discharge tem- perature thermistor (TH4)[...]

  • Page 46

    46 Thermistors Open detection Short detection Symbol Name TH3 TH7 TH8 Branch box unit TH-A~E (Room A-E) – 40  [– 40°F] or below – 40  [– 40°F] or below – 35  [– 30°F] or below 90  [194°F] or above 90  [194°F] or above 170  [338°F] or above – 40  [– 40°F] or below 90  [194°F] or above Thermistor <Ou[...]

  • Page 47

    47 Error Code Abnormal point and detection method Judgment and action Case UF (4100) Compressor overcurrent interruption (When compressor locked) Abnormal if overcurrent of DC bus or compressor is detected within 30 seconds after compressor starts operating. 1 Stop valve is closed. 2 Decrease of power supply voltage 3 Looseness, disconnection or co[...]

  • Page 48

    48 Error Code Abnormal point and detection method Judgment and action Case E0 (No display) Remote controller communication error (Signal receiving error) (1) Abnormal if any signal from IC of refrigerant address “0” could not be normally received for 3 minutes. (2) Abnormal if sub remote controller could not receive any signal for 2 min- utes. [...]

  • Page 49

    49 Error Code Abnormal point and detection method Judgment and action Case E9 (6841) Indoor - branch box/branch box - outdoor unit communication error (T ransmitting error) (Branch box/outdoor unit) (1) Abnormal if “0” receiving is detected 30 times continuously though branch box/ outdoor controller circuit board has transmitted “1”. (2) Ab[...]

  • Page 50

    50 Phenomena Factor Countermeasure 2. Remote controller display works normally and the unit performs heating operation, however , the capacity cannot be fully obtained. 1 Linear expansion valve fault Opening cannot be adjusted well due to linear expan- sion valve fault. 2 Refrigerant shortage 3 Lack of insulation for refrigerant piping 4 Filter clo[...]

  • Page 51

    51 CN51 X 5 4 3           Y L 1 : Error display lamp L 2 : Compressor operation lamp X, Y : Relay (Coil standard of 0.9W or less for DC 12V)         CN3S X Y SW1 SW2 1 2 3 X, Y : Relay (DC1mA) SW1 SW2 ON Heating V alidity of SW1 OFF Cooling Invalidity of SW1  Distant control board  Relay c[...]

  • Page 52

    52 8-6. HOW TO CHECK THE P ARTS OUTDOOR UNIT : MXZ-8B48NA Parts name Check points Disconnect the connector then measure the resistance with a tester . (At the ambient temperature 10  ~30  , 50°F~86°F) Thermistor (TH3) <Outdoor pipe> Thermistor (TH4) <Discharge> Thermistor (TH6) <2-phase pipe> Thermistor (TH7) <Outdoor&g[...]

  • Page 53

    53 Notes · High voltage is applied to the connector (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. (It causes trouble of the outdoor controller circuit board and fan motor .) Self check Symptom : The outdoor fan cannot turn around.   Check method [...]

  • Page 54

    54 0 10 20 30 40 50 - 2 0 - 1 0 0 1 02 03 0 4 0 5 0 -4 -14 32 50 68 86 104 122  °F T emperature Resistance (k  ) 500 400 300 200 100 0 25 50 75 100 120 77 122 167 212 248  °F T emperature Resistance (k  ) <Thermistor feature chart> Low temperature thermistors • Thermistor <Outdoor pipe> (TH3) • Thermistor <2-phase p[...]

  • Page 55

    55 BRANCH BOX : P AC-AKA51BC P AC-AKA31BC 1 2 3 4 5 6 M Blue Brown Y ellow Orange Red White Parts name Check points Disconnect the connector then measure the resistance with a tester . (At the ambient temperature 10  ~30  , 50°F~86°F) Disconnect the connector then measure the resistance with a tester . ( Winding temperature 20  , 68°F )[...]

  • Page 56

    56 <Output pulse signal and the valve operation> (2) Linear expansion valve operation    Open Extra ti g htenin g ( about 32 p ulse ) Pulse number 500 pulse Opening a valve all the way Close V alve position (capacity) Opening a valve : 8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8 Closing a valve : 1 → 2 → 3 → 4 → 5 → 6[...]

  • Page 57

    57 Main body Lead wire Stopper Coil (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 . A <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 [...]

  • Page 58

    58 T roubleshooting Problem Check point Corrective measure If the linear expansion valve becomes locked and the motor is still operating, the motor will emit a clicking noise and will not function. This clicking noise indicates an abnormality . Use an all-purpose electrical meter to measure the resistance between the different coils (red-white, red[...]

  • Page 59

    59 Communication power supply D71 V oltage 24V DC CNS S1-S2: 208/230V AC (Branch box/outdoor unit connecting wire) CNAC 2 to 4 : Power supply for outdoor controller circuit board (208/230V AC) 1 to 3 : Power supply for indoor and outdoor unit connection wire (208/230V AC) CNF1, CNF2 Connect to the fan motor 1 - 4 : 280-350V DC 5 - 4 : 15V DC 6 - 4 [...]

  • Page 60

    60 Outdoor power circuit board MXZ-8B48NA CNAC1, CNAC2 208/230 V AC Connect to the out- door controller circuit board (CNAC) NI, LI V oltage of 208/230 V AC is input (Connect to the terminal block (TB1)) EI, E4 Connect to the earth DCL1, DCL2 Connect to DCL P2 Connect to the smooth- ing capacitor CB + U/V/W Connect to the compres- sor (MC) V oltage[...]

  • Page 61

    61 Branch box controller board P AC-AKA51BC P AC-AKA31BC LEV -A to E Connect to LEV -A to E LEV -A to C for P AC-AKA31BC TH-A to E Connect to Thermistor-A to E TH-A to C for P AC-AKA31BC CN3C, CND Connect to TB2B (Branch box / Outdoor unit connecting wire) TB3A to TB3E Connect to TB3A to TB3E (Branch box / Indoor unit connecting wire) TB3A to TB3C [...]

  • Page 62

    62 Forced defrost Start Normal Normal — When compressor is working in heating operation. + Abnormal history clear No function Self-diagnosis (Indoor unit selection) Indicating a particular self-diagnosis Clear — off or operating — T est run Operating OFF Under suspension T est run mode setting Heating Cooling Indoor No.1 Indoor No.4 Indoor No[...]

  • Page 63

    63 SW6 SW9 Model selection SW6 Switching function of defrosting prohibited time During the F AN or COOL mode, and thermo - OFF in heating operation, set the opening of liner expansion valve on branch box LEV opening setting function for stopping unit during heating operation Switching the Input Current Limit Level 1 3 2 4 1 ON 23456 7 8 Always Alwa[...]

  • Page 64

    64 <Outdoor unit operation monitor function> Digital indicator LED3 displays 2 digit number or code to inform operation condition and the meaning of error code by controlling DIP SW2 on outdoor controller . SW2 setting 1 ON 23456 Display detail Explanation for display Unit Operation indicator SW2 : Indicator change of self diagnosis <Digit[...]

  • Page 65

    65 SW2 setting 1 ON 23456 Display detail Explanation for display Unit Pipe temperature / Liquid (TH3) – 40~194 – 40~194 (When the coil thermistor detects 0°F or below , “–” and temperature are displayed by turns.) (Example) When –10°F; 0.5 secs. 0.5secs. 2 secs. °F 1 ON 23456 1 ON 23456 1 ON 23456 1 ON 23456 Discharge temperature (TH[...]

  • Page 66

    66 SW2 setting 1 ON 23456 Display detail Explanation for display Unit Pipe temperature / Liquid (TH3) on error occurring – 40~194 – 40~194 (When the coil thermistor detects 0°F or below , “–” and temperature are displayed by turns.) (Example) When –15°F; 0.5 secs. 0.5secs. 2 secs. °F 1 ON 23456 1 ON 23456 1 ON 23456 1 ON 23456 Compre[...]

  • Page 67

    67 SW2 setting 1 ON 23456 Display detail Explanation for display Unit Capacity setting display Displayed as an outdoor capacity code. Code display 1 ON 23456 1 ON 23456 Outdoor unit setting information Indoor pipe temperature / Liquid – 38~190 Code display °F – 38~190 (When the temperature is 0°F or less, “–” and temperature are display[...]

  • Page 68

    68 1 ON 23456 °C Discharge superheat. SHd 0~255 0~255 (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by turns.) °C Sub-cool. SC (cooling mode) 0~130 0~130 (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by turns.) 0.1 A Input current of outdoor unit[...]

  • Page 69

    69 SW2 setting Display detail Explanation for display Unit Code display Error postponement code history (2) of outdoor unit Postponement code display Blinking: During postponement Lighting: Cancellation of postponement “00” is displayed in case of no postponement. Code display Error postponement code history (3) of outdoor unit Postponement cod[...]

  • Page 70

    70 SW2 setting Display detail Explanation for display Unit : Indoor pipe temperature / Liquid on error occurring – 39~88 – 39~88 (When the temperature is 0°C or less, “–” and temperature are displayed by turns.) (Example) When –15°C; 0.5 secs. 0.5secs. 2 secs. Indoor pipe temperature / Cond./ Eva. on error occurring – 39~88 – 39~8[...]

  • Page 71

    71 SW2 setting Display detail Explanation for display Unit Thermo ON time until error stops 0~999 0~999 (When it is 100 minutes or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 415 minutes; 0.5 secs. 0.5secs. 2 secs. 1 ON 23456 Minute 15 4 1 ON 23456 Normal Overvoltage error Undervoltage error L1 or L2 phas[...]

  • Page 72

    72 <Branch box unit operation monitor function> [When option part ‘A-Control Service T ool (P AC-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 error code by controlling DIP SW2 on ‘A-Control Service T ool’. SW2 setting[...]

  • Page 73

    73 SW2 setting Display detail Explanation for display Unit 1 ON 23456 1 ON 23456 LEV -B opening pulse 0~500 0~500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns. (Example) When 150 pulse; 0.5 secs. 0.5secs. 2 secs. Pulse 1 50 LEV -C opening pulse 0~500 0~500 (When it is 100 pulse or more, hundreds di[...]

  • Page 74

    74 SW2 setting Display detail Explanation for display Unit 1 ON 23456 1 ON 23456 Indoor pipe temperature / Liquid TH2 Indoor-B – 35~88 (°C) – 31~190 (°F) w Indoor pipe temperature / Liquid TH2 Indoor-C – 39~88 (°C) – 38~190 (°F) w °C °F( w ) °C °F( w ) – 39~88 (°C), – 38~190 (°F) (When the temperature is 0 : or less, “–”[...]

  • Page 75

    75 1 ON 23456 Pulse LEV -6 opening pulse 0~500 0~500 Pulse LEV -7 opening pulse 0~500 0~500 Pulse LEV -8 opening pulse 0~500 0~500 0.1 kgf/cm² PSIG( w ) High pressure (63HS) 0~500 (0.1 kgf/cm²) 0~71 1 (PSIG) w 0~500 (0.1 kgf/cm²), 0~71 1 (PSIG) (When it is 100 or more, hundreds digit, tens digit and ones digit are displayed by turns.) Input curr[...]

  • Page 76

    76 1 ON 23456 SW2 setting Display detail Explanation for display Unit Branch pipe temperature TH-A – 39~88 (°C) – 38~190 (°F) w 1 ON 23456 °C °F( w ) Branch pipe temperature TH-B – 39~88 (°C) – 38~190 (°F) w 1 ON 23456 °C °F( w ) °C °F( w ) Branch pipe temperature TH-C – 39~88 (°C) – 38~190 (°F) w °C °F( w ) Branch pipe te[...]

  • Page 77

    77 SW2 setting Display detail Explanation for display Unit Indoor - setting temperature Indoor-A 16~31 (°C) 60~87 (°F) w Indoor - setting temperature Indoor-B 16~31 (°C) 60~87 (°F) w Indoor - setting temperature Indoor-C 16~31 (°C) 60~87 (°F) w Indoor - setting temperature Indoor-D 16~31 (°C) 60~87 (°F) w °C °F( w ) Indoor - setting tempe[...]

  • Page 78

    78 8-9. SELECTING FUNCTIONS USING THE REMOTE CONTROLLER Each function can be set according to necessity 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 W 1 The functions table below a[...]

  • Page 79

    79 9 PRECAUTIONS AGAINST REFRIGERANT LEAKAGE Indoor unit Outdoor unit 9-1. INTRODUCTION R410A refrigerant of this air conditioner is non-toxic and non-flammable but leaking of large amount from an indoor unit into t he room where the unit is installed may be deleterious. T o prevent possible injury , the rooms should be large enough to keep the R41[...]

  • Page 80

    80 Indoor unit The smallest room The second smallest room Outdoor unit V entilation apparatus Indoor unit Opening W all Outdoor unit (Situation in which there are no door openings or in which there are openings above and blow doors that occupy at least 0.15% of the floor area) (3) Use the results of calculations (1) and (2) to calculate the refrige[...]

  • Page 81

    81 10 DISASSEMBL Y PROCEDURE OPERA TING PROCEDURE PHOTOS & ILLUSTRA TION 1. Removing the service panel and top panel (1) Remove 3 service panel fixing screws (5 × 10) and slide the hook on the right downward to remove the service panel. (2) Remove screws (3 for front, 3 for rear/5 × 10) of the top panel and remove it. 2. Removing the fan moto[...]

  • Page 82

    82 OPERA TING PROCEDURE PHOTOS Photo 4 4. Removing the thermistor <Outdoor 2-phase pipe> (TH6) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Disconnect the connectors, TH6 and TH7 (red), on the controller circuit board in the electrical parts box. (4) Loosen the clamp for the lead wire in the rear o[...]

  • Page 83

    83 OPERA TING PROCEDURE PHOTOS 7. Removing the solenoid valve coil <4-way valve> (21S4) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) [Removing the solenoid valve coil <4-way valve>] (3) Remove 4-way valve solenoid coil fixing screw (M4 × 6). (4) Remove the solenoid valve coil <4-way valve>[...]

  • Page 84

    84 1 1. Removing the high pressure switch (63H) and low pressure switch (63L) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Remove the electrical parts box. (See Photo 4) (4) Remove 3 right side panel fixing screws (5 o 10) in the rear of the unit and remove the right side panel. (5) Pull out the lead wir[...]

  • Page 85

    85 OPERA TING PROCEDURE PHOTOS 1. Removing the controller cover and under panel (1) Remove 3 controller cover fixing screws (4 o 10) to detach the cover . (See Photo 1) (2) Remove 6 under panel fixing screws (4 o 10) to remove the panel. (See Photo 1) Photo 1 Controller cover fixing screws Under panel fixing screws 2. Removing the drain pan (1) Rem[...]

  • Page 86

    OPERA TING PROCEDURE PHOTOS 4. Removing the LEV coil (LEV -A–E) (1) Remove the controller cover . (See Photo 1) (2) Remove the under cover . (See Photo 1) (3) Remove 4 separator fixing screws (4 o 10) in the side of the branch box. (See Photo 4) (4) T ilt the separator to the board side. (See Photo 4) (5) Loosen the side clamps of the board and d[...]