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Panasonic CU-4KE31NBU manual

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Table of contents for the manual

  • Page 1

    IMPORTANT These air conditioners employ new refrigerant R410A. Pay special attention when servicing the unit. Wall mounted type CS-MKE7NKU CS-MKE9NKU CS-MKE12NKU CS-MKE18NKU CS-MKE24NKU < Applicable Indoor Units > TECHNICAL & SER VICE MANU AL OUTDOOR UNIT : CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU DC INVER TER MUL TI-SYSTEM AIR CONDITIONER Pro[...]

  • Page 2

    • Before doing repair work, please read the " SAFETY PRECA UTIONS" carefully and fully understand them. • The precautionary items here are divided into " W arning" and " Caution" items. Items in par ticular which may cause death or serious injury to the ser vice personnel if the wor k is not perf or med correctly ,[...]

  • Page 3

    W arning If refrigerant gas blows off during the work, do not touch the refrigerant gas as it may cause frostbite . If refrigerant gas leaks during the wor k, ventilate the room. If refrigerant gas catches fire, harmful gas may be generated. Do not mix any gas other than the specified refrigerant gas in the refrigerating cycle. If air or other cont[...]

  • Page 4

    T able of Contents 2 4 6 7 8 17 20 21 24 27 50 56 62 68 71 77 80 81 82 83 87 .............................................................................................................. ...................................................................................................................... ...........................................[...]

  • Page 5

    88 89 90 90 91 93 94 94 A-1 ......................................................................... ................................................................................................... ................................................................................................ ...................................................[...]

  • Page 6

    APPLICABLE INDOOR UNITS CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU Multi-Outdoor Unit Indoor Unit 3-Room 4-Room 4-Room CS-MKE7NKU YES YES YES YES YES YES YES YES YES NO YES YES CS-MKE9NKU CS-MKE12NKU CS-MKE18NKU CS-MKE24NKU Wall Mounted Type CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU Multi-Outdoor Unit Indoor Unit 3-Room 4-Room 4-Room CS-MKE9NB4U & CZ-18BT1U[...]

  • Page 7

    95 °F DB / 71 °F WB 67 °F DB / 57 °F WB 80 °F DB / 67 °F WB – DB / – WB 1. OPERA TING RANGE Maximum Minimum Maximum Minimum 115 °F DB 14 °F DB 75 °F DB / 65 °F WB – DB / 0 °F WB T emperature Indoor Air Intake T emp. Outdoor Air Intake T emp. Cooling Heating 7[...]

  • Page 8

    2. SPECIFICATIONS 2-1. Unit Specifications Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE9NKU × 2 Remarks: 1. The values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : CS-MKE9[...]

  • Page 9

    Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE9NKU × 3 Remarks: 1. The values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : CS-MKE9NKU 3units Outdoor Unit : CU-3KE19NBU 1unit[...]

  • Page 10

    Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE9NKU ×  3 Remarks: 1. The values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : CS-MKE9NKU 3units Outdoor Unit : CU-3KE19NBU 1[...]

  • Page 11

    Outdoor Unit CU-4KE24NBU Indoor Unit Duct Less Type Rated CS-MKE7NKU × 2 + CS-MKE9NKU Remarks: 1. The values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : CS-MKE7NKU 2unit[...]

  • Page 12

    Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE9NKU × 3 Remarks: 1. The values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : CS-MKE9NKU 3units Outdoor Unit : CU-4KE24NBU 1unit[...]

  • Page 13

    Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE9NKU × 3 Remarks: 1. The values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : CS-MKE9NKU 3units Outdoor Unit : CU-4KE24NBU 1unit[...]

  • Page 14

    Outdoor Unit CU-4KE31NBU Indoor Unit CS-MKE7NKU × 3 + CS-MKE9NKU Remarks: 1. The values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : CS-MKE7NKU 3units / CS-MKE9NKU 1units[...]

  • Page 15

    Outdoor Unit CU-4KE31NBU Indoor Unit CS-MKE9NKU × 4 Remarks: 1. The values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : CS-MKE9NKU 4units Outdoor Unit : CU-4KE31NBU 1unit[...]

  • Page 16

    Outdoor Unit CU-4KE31NBU Indoor Unit CS-MKE9NKU × 4 Remarks: 1. The values shown in performance section and electrical rating section above are based on the following unit combination. For other combination unit, please refer to the "Unit Combination Tables" in this manual. Indoor Unit : CS-MKE9NKU 4units Outdoor Unit : CU-4KE31NBU 1unit[...]

  • Page 17

    Outdoor Unit CU-3KE19NBU 2-2-1. Outdoor Unit Control PCB Control Circuit Fuse Controls Part No. Microprocessor 250V 25A CB-CU-3KE19NBU DATA SUBJECT TO CHANGE WITHOUT NOTICE. Pints (cc) - Micro F VAC External Finish Acrylic baked-on enamel finish FV50S ... 1.91 (900) - - Internal Controller Yes Yes Aluminum Plate Fin / Copper Tube 2 18.1 Face Area f[...]

  • Page 18

    Outdoor Unit CU-4KE24NBU Control PCB Control Circuit Fuse Controls Part No. Microprocessor 250V 25A CB-CU-4KE24NBU DATA SUBJECT TO CHANGE WITHOUT NOTICE. Pints (cc) - Micro F VAC External Finish Acrylic baked-on enamel finish FV50S ... 1.91 (900) - - Internal Controller Yes Yes Aluminum Plate Fin / Copper Tube 2 18.1 Face Area ft 2 (m 2 ) 6.40 (0.5[...]

  • Page 19

    Outdoor Unit CU-4KE31NBU Control PCB Control Circuit Fuse Controls Part No. Microprocessor 250V 25A CB-CU-4KE31NBU DATA SUBJECT TO CHANGE WITHOUT NOTICE. Pints (cc) - Micro F VAC External Finish Acrylic baked-on enamel finish FV50S ... 2.55 (1,200) - - Internal Controller Yes Yes Aluminum Plate Fin / Copper Tube 2 18.1 Face Area ft 2 (m 2 ) 7.75 (0[...]

  • Page 20

    Temperature F ( C) 40 35 30 25 20 15 10 5 0 ( - 20) ( - 15) ( - 10) ( - 5) (0) (5) (10) (15) (20) - 4 5 14 23 32 41 50 59 68 Resistance (k ohm) 0 32 50 68 86 104 122 140 158 176 194 40 60 80 100 120 140 160 180 200 20 Resistance (k ohm) (0) (10) (20) (30) (40) (50) (60) (70) (80) (90) Temperature F ( C) 2-3. Other Component Specifications CU-3KE19N[...]

  • Page 21

    Wide tube service valve dia.3/8" (9.52) ×  3 Narrow tube service valve dia.1/4" (6.35) ×  3 4-7/16 5-29/32 2-27/32 2-3/4 2-1/32 4-1/2 2-15/16 2-3/4 29-1/8(740) 23/32 1-13/16 35-7/16(900) 23-15/16 5-11/32 15/32 12-19/32(320) 13-19/32 14-17/32 11-17/32 ID:23/32 5-ID:15/16 1-3/8 2-15/16 2-1/16 3. DIMENSIONAL D A T A Outdoor Unit CU-3[...]

  • Page 22

    Wide tube service valve dia.1/2" (12.70) ×  1 Narrow tube service valve dia.1/4" (6.35) ×  4 Wide tube service valve dia.3/8" (9.52) ×  3 4-7/16 5-29/32 2-27/32 2-3/4 2-3/4 2-1/32 4-1/2 2-15/16 2-3/4 2-3/4 29-1/8(740) 23/32 1-13/16 35-7/16(900) 23-15/16 5-11/32 15/32 12-19/32(320) 13-19/32 14-17/32 11-17/32 ID:23/32 5-ID:[...]

  • Page 23

    Outdoor Unit CU-4KE31NBU Unit: inch(mm) (852-0-0010-20300-0) Wide tube service valve dia.1/2" (12.70) ×  2 Narrow tube service valve dia.1/4" (6.35) ×  4 Wide tube service valve dia.3/8" (9.52) ×  2 4-7/16 5-29/32 2-1/32 4-1/2 2-15/16 2-3/4 2-3/4 35-1/32(890) 23/32 1-13/16 35-7/16(900) 23-15/16 5-11/32 15/32 12-19/32(320)[...]

  • Page 24

    Compressor 4-way valve High pressure switch H.P. Main accumulator Sub accumulator Service valve on narrow tube Service valve on wide tube CN BN AN CW BW AW O.D.1/4" O.D.1/4" O.D.1/4" O.D.3/8" O.D.3/8" O.D.3/8" Heat exchanger Cooling cycle Heating cycle Defrosting cycle Indoor unit Outdoor unit Defrost valve for hot gas[...]

  • Page 25

    4-way valve High pressure switch H.P. Defrost valve for hot gas bypass Outdoor Unit CU-4KE24NBU Insulation of Refrigerant T ubing Because capillary tubing is used in the outdoor unit, both the wide and narrow tubes of this air conditioner become cold. To prevent heat loss and wet floors due to dripping of condensation, both tubes must be well insul[...]

  • Page 26

    Compressor Main accumulator Sub accumulator Service valve on narrow tube Electric expansion valve Service valve on wide tube DN CN BN AN DW CW BW AW O.D.1/4" O.D.1/4" O.D.1/4" O.D.1/4" O.D.1/2" O.D.1/2" O.D.3/8" O.D.3/8" Heat exchanger Cooling cycle Heating cycle Defrosting cycle Strainer Header Header S M M [...]

  • Page 27

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 28

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 29

    Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE12NKU ×  1 Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current perfo[...]

  • Page 30

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 31

    • This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on the indoor unit type. • Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value. (In this case, be sure to stop all the indoor units where performance is not b[...]

  • Page 32

    Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE12NB4U ×  1 • This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on the indoor unit type. • Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value. (In this case, be s[...]

  • Page 33

    • This performance chart shows operation of a single wall-mounted indoor unit. The performance chart will vary depending on the indoor unit type. • Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value. (In this case, be sure to stop all the indoor units where performance is not b[...]

  • Page 34

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 35

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 36

    Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE12NKU ×  1 Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current perfo[...]

  • Page 37

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 38

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 39

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 40

    Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE12NB4U ×  1 Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current perf[...]

  • Page 41

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 42

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 43

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 44

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart ?[...]

  • Page 45

    146 (1.0) 174 (1.2) 118 (0.8) 90 (0.6) Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) In[...]

  • Page 46

    146 (1.0) 174 (1.2) 118 (0.8) 90 (0.6) Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) In[...]

  • Page 47

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart (3[...]

  • Page 48

    Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) Indoor discharge air performance chart ?[...]

  • Page 49

    146 (1.0) 174 (1.2) 118 (0.8) 90 (0.6) Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Heating Characteristics (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart (2) Operating current performance chart (2) Operating current performance chart (3) In[...]

  • Page 50

    Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE9NKU × 3 P ower Supply : 230V Single Phase 60Hz < Cooling Capacity > 5-2. Cooling Capacity TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB : Outdoor Ambient Temp. 95 °F[...]

  • Page 51

    Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE12NB4U × 3 P ower Supply : 230V Single Phase 60Hz < Cooling Capacity > TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB : Outdoor Ambient Temp. 95 °F (35 °C) DB 2. 3. A[...]

  • Page 52

    Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-MKE9NKU × 3 P ower Supply : 230V Single Phase 60Hz < Cooling Capacity > TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB : Outdoor Ambient Temp. 95 °F (35 °C) DB 2. 3. Abo[...]

  • Page 53

    Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-KE18NB4UW + CS-MKE12NB4U + CS-MKE12NB4U P ower Supply : 230V Single Phase 60Hz < Cooling Capacity > TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB : Outdoor Ambient Temp. 9[...]

  • Page 54

    Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NKU × 4 P ower Supply : 230V Single Phase 60Hz < Cooling Capacity > TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB : Outdoor Ambient Temp. 95 °F (35 °C) DB 2. 3. Abo[...]

  • Page 55

    Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NB4U × 4 P ower Supply : 230V Single Phase 60Hz < Cooling Capacity > TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB : Outdoor Ambient Temp. 95 °F (35 °C) DB 2. 3. Ab[...]

  • Page 56

    Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE9NKU × 3 P ower Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > 5-3. Cooling Capacity (Low Ambient) TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) NO TE 1. 2. Above data represents the value when the operation frequency of a compressor is fixed. Above[...]

  • Page 57

    Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE12NB4U × 3 P ower Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) NO TE RATING CAPACITY: 17,400 BTU/h AIR FLOW RATE: 706 CFM INDOOR OUTDOOR ENT. T EMP. o F ( o C) AMBIENT TEMP. o F ( o C) W B DB 15 25 35 [...]

  • Page 58

    Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-MKE9NKU × 3 P ower Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) NO TE RATING CAPACITY: 23,200 BT U/h AIR FLOW RATE: 777 CFM INDOOR OUTDOOR ENT. T EMP. o F ( o C) AMBIEN T T EMP. o F ( o C) W B DB 15 25 35[...]

  • Page 59

    Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-KE18NB4UW + CS-MKE12NB4U + CS-MKE12NB4U P ower Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) NO TE RATING CAPACITY: 22,000 BTU/h AIR FLOW RATE: 812 CFM INDOOR OUTDOOR ENT. T EMP. o F ( o C) AMBIENT TEMP. o [...]

  • Page 60

    Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NKU × 4 P ower Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) NO TE RATING CAPACITY: 30,600 BTU/h AIR FLOW RATE: 1,036 CFM INDOOR OUTDOOR ENT. T EMP. o F ( o C) AMBIENT TEMP. o F ( o C) W B DB 15 25 35 [...]

  • Page 61

    Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NB4U × 4 P ower Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h) NO TE RATING CAPACITY: 28,600 BTU/h AIR FLOW RATE: 883 CFM INDOOR OUTDOOR ENT. T EMP. o F ( o C) AMBIENT TEMP. o F ( o C) W B DB 15 25 35 4[...]

  • Page 62

    Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE9NKU × 3 P ower Supply : 230V Single Phase 60Hz < Heating Capacity > 5-4. Heating Capacity TH : T otal Heating Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 70 °F (21.1 °C) DB : Outdoor Ambient Temp. 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB 2. 3. Above data repres[...]

  • Page 63

    Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE12NB4U × 3 P ower Supply : 230V Single Phase 60Hz < Heating Capacity > TH : T otal Heating Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 70 °F (21.1 °C) DB : Outdoor Ambient Temp. 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB 2. 3. Above data represents the value when [...]

  • Page 64

    Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-MKE9NKU × 3 P ower Supply : 230V Single Phase 60Hz < Heating Capacity > TH : T otal Heating Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 70 °F (21.1 °C) DB : Outdoor Ambient Temp. 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB 2. 3. Above data represents the value when th[...]

  • Page 65

    Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-KE18NB4UW + CS-MKE12NB4U + CS-MKE12NB4U P ower Supply : 230V Single Phase 60Hz < Heating Capacity > TH : T otal Heating Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 70 °F (21.1 °C) DB : Outdoor Ambient Temp. 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB 2. 3. Above data r[...]

  • Page 66

    Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NKU × 4 P ower Supply : 230V Single Phase 60Hz < Heating Capacity > TH : T otal Heating Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 70 °F (21.1 °C) DB : Outdoor Ambient Temp. 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB 2. 3. Above data represents the value when th[...]

  • Page 67

    Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NB4U × 4 P ower Supply : 230V Single Phase 60Hz TH : T otal Heating Capacity (BTU/h) 1. Rating conditions (#) : Indoor Unit Entering Air Temp. 70 °F (21.1 °C) DB : Outdoor Ambient Temp. 47 °F (8.3 °C) DB / 43 °F (6.1 °C) WB 2. 3. Above data represents the value when the operation frequency of a[...]

  • Page 68

    6. ELECTRICAL DA T A 6-1. Electric Wiring Diagrams Outdoor Unit CU-3KE19NBU 8FA2-5251-11700-1 68[...]

  • Page 69

    Outdoor Unit CU-4KE24NBU 8FA2-5251-11500-1 69[...]

  • Page 70

    Outdoor Unit CU-4KE31NBU 8FA2-5251-11300-1 70[...]

  • Page 71

    7. FUNCTIONS 7-1. Explanation of Functions The numerical values such as temperature, frequency, time and current in parentheses are an example of CU-4KE31NBU and the values are different from the other models. Control/conditions INITIAL Breaker is ON. Power is supplied to the indoor and outdoor unit control circuits, however the unit remains stoppe[...]

  • Page 72

    Control/conditions HEAT When defrost operation begins, frost has formed on the outdoor unit (when the ambient air temperature is low). Defrost operation begins based on outdoor heat exchanger temperature and outdoor air temperature conditions. Non-stop defrost (Refer to Fig. 1) 1. After HEAT operation begins, the temperature of the outdoor heat exc[...]

  • Page 73

    Control/conditions COOL The ON/OFF operation button on the remote controller is pressed. The room temperature has reached the desired temperature. The outdoor unit does not operate for 3 minutes even after the breaker is turned ON. This is in order to stabilize the return of oil to the compressor. The outdoor unit starts. (Compressor and the outdoo[...]

  • Page 74

    Control/conditions SENSOR DRY (1/f fluctuation fan) The ON/OFF operation button on the remote controller is pressed. The outdoor unit does not operate for 3 minutes even after the breaker is turned ON. This is in order to stabilize the return of oil to the compressor. The outdoor unit starts. (Compressor and the outdoor fan start.) When the frequen[...]

  • Page 75

    1/f fluctuation fan 250 200 6-minute cycle Fig. 2 150 100 (Step) 50 0 75[...]

  • Page 76

    < Low Ambient Cooling Operation > When the mode is switched from cooling opration to low ambient cooling operation, the compressor is stopped for 150 seconds temporarily. Outdoor fan speed [ rpm ] Outdoor air temperature 32 °F ( °C ) When the mode has been switched to low ambient cooling operation, the outdoor fan speed is lowered as the ou[...]

  • Page 77

    7-2. Protective Functions 7-2-1. Defrost Detection and Release (2) Clean defrost If all indoor units are stopped during HEAT operation, and frost is detected at the L1 line, and the conditions for defrost are met, then defrost operation occurs, and the unit stops after defrost is completed. (1) Non-stop defrosting Heating operation NO TE Defrost do[...]

  • Page 78

    7-2-2. Current Control The operating current may rise as a result of causes including increasing heating or cooling loads or decreases in power voltage. In these cases, the operating frequency is automatically reduced, or operation is stopped, in order to control the operating current so that it is (20 A) or less. The operating frequency is reduced[...]

  • Page 79

    7-2-5. Control at HEAT Start-up If HEAT operation is started when the outdoor air temperature is 59 °F or below, the unit operates at the HEAT start-up frequency (70 Hz or above). Reset conditions The compressor frequency exceeds the start-up frequency of (70 Hz). The compressor thermostat is OFF. Frequency reduction for indoor high-load control h[...]

  • Page 80

    8. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE) 8-1. Precautions before Performing Inspection or Repair Both the indoor unit and outdoor unit include electronic control circuits. Be sure to pay attention to the following before inspecting or repairing the outdoor-side electronic circuits. High-capacity electrolytic capacitors are used inside the ou[...]

  • Page 81

    8-2. Trouble Diagnosis by Error Monitor Lamps 8-2-1. Location of the Error Monitor Lamps Remove the top plate of outdoor unit and the cover of Electrical Component Box. The Power Lamp and Error Monitor Lamps are located on the P.C.Board of Electrical Component Box. (Fig.1) 8-2-2. Display of the Error Monitor Lamps If a protective device has activat[...]

  • Page 82

    8-3-1. Checking the outdoor unit 8-3. Checking the Outdoor System 8-3-2. Checking the defrost operation Work procedure Apply 220 V AC between terminals L1 and L2 on the outdoor unit terminal plate. • Short-circuit the T-RUN terminal to the COM terminal of TEST/T-RUN terminals. • The LED (red) on the control board must illuminate. • The compre[...]

  • Page 83

    8-4. Trouble Diagnosis of Each Part 8-4-1. Problems of Each Part and Inspection Points For details about the inspection points, refer to the Inspection Points for Each Part. Problems Inspection points Indoor unit Indoor unit does not operate. Self-Diagnostics check Indoor controller (control unit) Indoor fan motor Room temperature sensor Heat excha[...]

  • Page 84

    Problems Inspection points Indoor unit Indoor unit does not operate. Breaker Refrigerant gas pressure (9) (10) Operation lamp blinking. Operation lamp does not illuminate. Indoor fan dose not turn. Outdoor unit does not operate. Outdoor fan dose not turn. 4-way valve does not operate. The compressor (only) does not operate. The compressor stops on [...]

  • Page 85

    No voltage on circuit board (7) Electric expansion v alve When replacing the electric expansion valve and coil, be sure to attach the connectors in the correct positions. Labels are applied to the valve body and coil, corresponding to the connector colors, to identify them. Controller check Voltage varies 0 ohm No temperature change Temperature cha[...]

  • Page 86

    (8) Branch tubing temperature sensor Check that the sensor is securely contained in the thermostat holder. (9) Breaker Check whether or not the breaker has been tripped. Check that the breakers and fuses used are of the specified capacity. Check that the breaker and its line are exclusive for A/C use. (10) Refrigerant gas pressure Start a COOL test[...]

  • Page 87

    8-5. Trouble Diagnosis of Fan Motor This outdoor DC f an motor contains an inter nal control PCB. Therefore, it is not possib le to measure the coil resistance, and the f ollowing procedure should be used to chec k the motor . P erform the trouble diagnosis by T est Run mode descr ibed on Installation Instructions of indoor unit. [T r ouble symptom[...]

  • Page 88

    9. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 9-1. Characteristics of New Refrigerant R410A 9-1-1. What is New Refrigerant R410A? R410A is a new refrigerant that contains two types of pseudo-non-azeotropic refrigerant mixture. Its refrigeration capacity and energy efficiency are about the same level as the conventional refrigerant, [...]

  • Page 89

    Tubing precautions Refrigerant R410A is more easily affected by dust or moisture compared with R22, thus be sure to temporarily cover the ends of the tubing with caps or tape prior to installation. Never use 0.0276" (0.7 mm)-thick copper tubing or tubing which is less than 0.0315" (0.8 mm) in thickness, since air conditioners with R410A a[...]

  • Page 90

    9-3. Tools Specifically for R410A For servicing, use the following tools for R410A Gauge manifold Charging hose Gas leak detector Refrigerant cylinder Charging cylinder Refrigerant recovery unit Vacuum pump with anti-reverse flow (*1) (Solenoid valve-installed type, which prevents oil from flowing back into the unit when the power is off, is recomm[...]

  • Page 91

    9-5. In Case of Compressor Malfunction CAUTION Should the compressor malfunction, be sure to make the switch to a replacement compressor as quickly as possible. Use only the tools indicated exclusively for R410A. See "9-3. Tools Specifically for R410A." 9-5-1. Procedure for Replacing Compressor (1) Recovering refrigerant Any remaining ref[...]

  • Page 92

    Valve Single valve Charge liquid refrigerant with cylinder in up-side-down position. Single valve (with siphon tube) Charge with cylinder in normal position. Liquid Valve Liquid Charging cylinder Open Refrigerant cylinder Liquid NO! CAUTION Never charge a large amount of liquid refrigerant at once to the unit. This may cause damage to the compresso[...]

  • Page 93

    Length of tubing Evacuation time Less than 33 ft. (10 m) More than 10 minutes More than 33 ft. (10 m) More than 15 minutes 9-6. In Case Refrigerant is Leaking CAUTION Never attempt to charge additional refrigerant when refrigerant has been leaking from the unit. Follow the procedure described below to locate points of leaks and carry out repairs, t[...]

  • Page 94

    9-7. Charging Additional Refrigerant 9-7-1. When Tubes are Extended Observe the proper amount of refrigerant as stated in this service manual or the installation manual that came with the indoor unit. Charge additional refrigerant in liquid state only. 9-8. Retro-Fitting Existing Systems 9-8-1. Use of Existing Units Never use new refrigerant R410A [...]

  • Page 95

    [...]

  • Page 96

    INSTALLATION INSTRUCTIONS CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU (852-6-4190-584-00-2) APPENDIX A A-1[...]

  • Page 97

    For Outdoor Unit This air conditioner uses the refrigerant R410A. External diameter of service port R410A: 5/16" Split System Air Conditioner 85264190584002 2011 CV6233187853 INSTALLATION INSTRUCTIONS NOTE Contents Page IMPORT ANT! Please Read Before Starting .................................. 2 1. GENERAL .....................................[...]

  • Page 98

    IMPORT ANT! Please Read Before Starting This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of your job to install or service the system so it operates safely and efficiently . For safe installation and trouble-free operation, you must:  Carefully read this instruc[...]

  • Page 99

     8VHWKHIODUHPHWKRGIRUFRQQHFWLQJWXELQJ  $SSOUHIULJHUDQWOXEULFDQWWRWKHPDWFKLQJVXUIDFHVRI the flare and union tubes before connecting them, then tighten the nut with a torque wrench for a leak-free connection.  &KHFNFDUHIXOOIRUOHDNVEHIRUHVWDUWLQJWKHWHVWUXQ  'R?[...]

  • Page 100

    4 1-2. Accessories Supplied with Unit T able 1 1-3. Optional Copper T ubing Kit Copper tubing for connecting the outdoor unit to the indoor unit is available in kits which contain the narrow and wide tubing, fittings and insulation. Consult your nearest sales outlet or air conditioning workshop. 1-4. T ype of Copper T ube and Insulation Material If[...]

  • Page 101

    5 2. Installation Site Selection 2-1. Indoor Unit A VOID:  direct sunlight.  nearby heat sources that may affect performance of the unit.  areas where leakage of flammable gas may be expected.  placing or allowing any obstructions near the air conditioner inlet or outlet.  installing in rooms that contain instant-on (rapid-start) flu[...]

  • Page 102

    6  install the indoor unit more than 3.3' (1 m) away from any antenna or power lines or connecting wires used for tele- vision, radio, telephone, security system, or intercom. Electrical noise from any of these sources may affect operation.  install in a sturdy manner to avoid increased operating noise. T able 3 * If total tubing length [...]

  • Page 103

    7 Fig. 4b Union 1/2"(12.70 mm ) 1/2"(12.70 mm ) Flare 3/8"(9.52 mm ) A joint for connecting tubes of different sizes (3/8"(9.52 mm ) 1/2"(12.70 mm )) Supplied Reducer 1/4"(6.35 mm ) 1/4"(6.35 mm ) 1/4"(6.35 mm ) C B A Outdoor unit Indoor unit (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) (CS-[...]

  • Page 104

    8 (B) Fig. 4d C B A (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) D Outdoor unit Indoor unit (CS-MKE18NKU) (CS-KE18NB4UW) 1/2"(12.70 mm ) 1/2"(12.70 mm ) 3/8"(9.52 mm ) 3/8"(9.52 mm ) 3/8"(9.52 mm ) 3/8"(9.52 mm ) (CS-MKE7NKU,CS-MKE9NKU,CS-[...]

  • Page 105

    9 (A) Fig. 4g Union 3/8"(9.52 mm ) Flare 1/2"(12.70 mm ) (1/2"(12.70 mm ) 3/8"(9.52 mm )) Supplied Reducer D C (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) Outdoor unit Indoor unit (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) 1/2"(12.70 mm ) 1/2"(12.70 mm ) 3/8"(9.52 mm ) 3/8&qu[...]

  • Page 106

    10 (D) Fig. 4j Union 5/8"(15.88 mm ) Flare 1/2"(12.70 mm ) (1/2"(12.70 mm ) 5/8"(15.88 mm ))Locally purchased C D (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) Outdoor unit Indoor unit (CS-MKE24NKU) Union 3/8"(9.52 mm ) Flare 1/2"(12.70 mm ) (1/2"(12.70 mm ) 3/8"(9.52 mm ))Supplied Reducer 1/[...]

  • Page 107

    2-3. Outdoor Unit A VOID:  heat sources, exhaust fans, etc. (Fig. 5a)  damp, humid or uneven locations. DO:  choose a place as cool as possible.  choose a place that is well ventilated.  install in a location where at least two sides are unob- structed, so that the flow of air at the intake port or exhaust port is not blocked, and so[...]

  • Page 108

    12 (1) Recommended dimensions of the baffle plates D F E C J H L I B K Q R A G O (3- 6.5 mm) 3- 1/4" (2- 6 mm) 2- 15/64" A B H C E F K I J G G D (4- 6.5 mm) 4- 1/4" Fig. 5h For Air Intake For Air Discharge Material to be used: Metal plate with corrosion protection treatment Plate thickness: 0.0394 to 0.0472" (1.0 to 1.2 mm) (2) [...]

  • Page 109

    13 (3) Installation procedure Panel top Panel front Panel side R Panel side L 1. Air Intake Baffle (1) Left side 1. Remove the top panel from the unit. 2. Remove the panel side L, and drill 3 holes of ø1/4 inch (6.5 mm) at the prescribed position. 3. Install the windbaffle on the unit using field supply bolts and nuts. 4. Recommended bolts to be u[...]

  • Page 110

    14 Fig. 6a 23-15/16 5-1 1/32 15/32 35-7/16 (900) 13-19/32 12-19/32 14-17/32 2-29/32 29-1/8 (740) 23/32 1-13/16 2-1/16 5-29/32 2-27/32 2-3/4 2-1/32 4-7/16 2-15/16 2-3/4 4-1/2 A Service valve on narrow tube side (Outer diameter 1/4"( 6.35 )) Service valve on wide tube side (Outer diameter 3/8"( 9.52 )) A (1) CU-3KE19NBU Fig. 6b 23-15/16 5-1[...]

  • Page 111

    15 2-6. Diagram of Outdoor Unit Installation Never install only a single indoor unit. Be sure to connect indoor and outdoor units only in combinations that are listed in the catalog or in the combination table that was provided with the outdoor unit. (Use caution. Connecting any other model may result in operation failure and malfunction.) The dime[...]

  • Page 112

    16 3. Installation Process 3-1. Embedding the T ubing and Wiring  Do not connect tubes to locations that are embedded.  Be sure to bind refrigerant tubing and inter-unit cables together with vinyl tape.  The power cable must be obtained on-site. (#12: Less than 85 ft.) # ... AWG (American Wire Gauge)  Be sure to apply the provided label[...]

  • Page 113

    17 When reaming, hold the tube end downward and be sure that no copper scraps fall into the tube. (Fig. 9) (3) Remove the flare nut from the unit and be sure to mount it on the copper tube. (4) Make a flare at the end of copper tube with a flare tool. * (Figs. 10 and 1 1) ( * Use “RIDGID” or equivalent.) A good flare should have the following c[...]

  • Page 114

    18 3-6. Insulation of Refrigerant T ubing T o prevent heat loss and wet floors due to dripping of con- densation, both tubes must be well insulated with a proper insulation material. The thickness of the insulation should be a minimum 5/16" (8 mm). (Fig. 16)  For wall-mounted units After connecting the refrigerant tubing to the outdoor unit[...]

  • Page 115

    19 4. Air Purging Air and moisture remaining in the refrigerant system have undesirable effects as indicated below . Therefore, they must be purged completely .  pressure in the system rises  operating current rises  cooling efficiency drops  moisture in the air may freeze and block capillary tubing  water may lead to corrosion of pa[...]

  • Page 116

    20 Cap tightening torque: 170 – 215 lbs·in (200 – 250 kgf·cm) (T ighten by hand, then use a wrench to turn approximately 45°.) Stopper Spindle Service port Screw diameter: 1/2 UNF 20 threads V alve core Cap nut tightening torque: 60 – 95 lbs·in (70 – 1 10 kgf·cm) (T ighten by hand, then use a wrench to turn approximately 30 .) <Stru[...]

  • Page 117

    21  Pump Down  When relocating or disposing of the air conditioner , request this service from the dealer where the unit was purchased, or from an appropriate agent. Perform pump-down as described below . What is pump-down?  Pump-down refers to recovering the refrigerant gas from the refrig- erant cycle at the outdoor unit. This work must [...]

  • Page 118

    22 5. Wiring Instructions 5-1. General Precautions on Wiring (1) Before wiring, confirm the rated voltage of the unit as shown on its nameplate, then carry out the wiring closely following the wiring diagram. (2) Provide a power outlet to be used exclusively for each unit, with a power supply disconnect and circuit break- er for overcurrent protect[...]

  • Page 119

    23 WARNING  Be sure to comply with local codes on running the wire from the indoor unit to the outdoor unit (size of wire and wiring method, etc.).  Each wire must be firmly connected.  No wire should be allowed to touch refrigerant tubing, the compressor , or any moving part.  Be sure to connect power wires correctly match- ing up numb[...]

  • Page 120

    24 When connecting each power wire to the corresponding terminal, follow the instructions “How to connect wiring to the terminal” and fasten the wire securely tight with the fixing screw of the terminal plate. How to connect wiring to the terminal a) For Indoor Unit (1) Cut the wire end with a cutting pliers, then strip the insulation to expose[...]

  • Page 121

    25 1 2 3 1 2 3 1 2 3 1 2 3 Indoor unit B Indoor unit A Ground Power: Single-phase, 230/208V AC 60HZ Power breaker (not provided) Outdoor unit T erminal board Label A Inter-unit cables #14 (not provided) T erminal board Inter-unit cables #14 (not provided) T erminal board Label B Label C Inter-unit cables #14 (not provided) Inter-unit cables #14 (no[...]

  • Page 122

    26 Regulations on wire size differ from locality to locality . For field wiring requirements, please refer to your local electri- cal codes. Make sure that the installation fully complies with all local and national regulations. (1) Remove access panel “C”. (Fig. 32) (2) Connect the inter-unit and power supply line accord- ing to the drawing on[...]

  • Page 123

    27 7 . Connecting a Home Automation Device The HA (white) 4P terminal is located on the indoor unit PCB. If a HA device will be used, connect it to this terminal. 8. Installation Check Sheet The strength of the installation location is sufficient to support the air conditioner weight. The indoor and outdoor units are installed level and vertically [...]

  • Page 124

    DC1111-0[...]