TECHNICAL & SERVICE MANUAL OUTDOOR UNIT : CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU DC INVERTER MULTI-SYSTEM AIR CONDITIONER CU-3KE19NBU Capacity at 230V Outdoor Model No. Product Code No.
SAFETY PRECAUTIONS • Before doing repair work, please read the " SAFETY PRECAUTIONS" carefully and fully understand them. • The precautionary items here are divided into " Warning" and " Caution" items. Items in particular which may cause death or serious injury to the service personnel if the work is not performed correctly, are included in the " Warning" table. However, even precautionary items identified as " Caution" also have the potential for serious consequences if not performed correctly.
Warning If refrigerant gas blows off during the work, do not touch the refrigerant gas as it may cause frostbite. Prohibit If refrigerant gas leaks during the work, 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 contaminants mix with the gas, pressure will become extremely high in the refrigerating cycle, which may cause a unit breakdown.
Table of Contents Page SAFETY PRECAUTIONS .............................................................................................................. 2 TABLE OF CONTENTS ...................................................................................................................... 4 APPLICABLE INDOOR UNITS ..................................................................................................... 6 1. OPERATING RANGE ...............................................................
Page 9. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 9-1. Characteristics of New Refrigerant R410A ......................................................................... 9-2. Checklist before Servicing ................................................................................................... 9-3. Tools Specifically for R410A ................................................................................................ 9-4. Tubing Installation Procedures ..........................
APPLICABLE INDOOR UNITS Wall Mounted Type Indoor Unit CS-MKE7NKU CS-MKE9NKU CS-MKE12NKU CS-MKE18NKU CS-MKE24NKU Multi-Outdoor Unit 3-Room CU-3KE19NBU YES YES YES YES NO 4-Room CU-4KE24NBU YES YES YES YES YES 4-Room CU-4KE31NBU YES YES YES YES YES Semi-Concealed Type Multi-Outdoor Unit Indoor Unit CS-MKE9NB4U CS-MKE12NB4U CS-KE12NB4UW & & & CZ-18BT1U CZ-18BT1U CZ-18BT1U 3-Room CU-3KE19NBU YES YES YES 4-Room CU-4KE24NBU YES YES YES 4-Room CU-4KE31NBU YES YES YES 6
1. OPERATING RANGE Temperature Cooling Heating Indoor Air Intake Temp. Outdoor Air Intake Temp.
2. SPECIFICATIONS 2-1.
Outdoor Unit Indoor Unit CU-3KE19NBU CS-MKE9NKU × 3 < 230V > Type 3-Room Multi Outdoor Unit Number of Connectable Indoor Units 3 Number of Operatable Indoor Units 3 Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER COP Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Control Fan Speeds Compressor Refrigerant / Amount
Outdoor Unit Indoor Unit CU-3KE19NBU CS-MKE9NKU × 3 < 208V > Type 3-Room Multi Outdoor Unit Number of Connectable Indoor Units 3 Number of Operatable Indoor Units 3 Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER COP Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Control Fan Speeds Compressor Refrigerant / Amount
Outdoor Unit Indoor Unit CU-4KE24NBU CS-MKE7NKU × 2 + CS-MKE9NKU Duct Less Type Rated < 230V > 4-Room Multi Outdoor Unit Type Number of Connectable Indoor Units 4 Number of Operatable Indoor Units 4 Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER COP SEER HSPF Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Control
Outdoor Unit Indoor Unit CU-4KE24NBU CS-MKE9NKU × 3 < 230V > Type 4-Room Multi Outdoor Unit Number of Connectable Indoor Units 4 Number of Operatable Indoor Units 4 Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER COP Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Control Fan Speeds Compressor Refrigerant / Amount
Outdoor Unit Indoor Unit CU-4KE24NBU CS-MKE9NKU × 3 < 208V > Type 4-Room Multi Outdoor Unit Number of Connectable Indoor Units 4 Number of Operatable Indoor Units 4 Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER COP Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Control Fan Speeds Compressor Refrigerant / Amount
Outdoor Unit Indoor Unit CU-4KE31NBU CS-MKE7NKU × 3 + CS-MKE9NKU Duct Less Type Rated < 230V > 4-Room Multi Outdoor Unit Type Number of Connectable Indoor Units 4 Number of Operatable Indoor Units 4 Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER COP SEER HSPF Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Control
Outdoor Unit Indoor Unit CU-4KE31NBU CS-MKE9NKU × 4 < 230V > Type 4-Room Multi Outdoor Unit Number of Connectable Indoor Units 4 Number of Operatable Indoor Units 4 Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER COP Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Control Fan Speeds Compressor Refrigerant / Amount
Outdoor Unit Indoor Unit CU-4KE31NBU CS-MKE9NKU × 4 < 208V > Type 4-Room Multi Outdoor Unit Number of Connectable Indoor Units 4 Number of Operatable Indoor Units 4 Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (High) Available Voltage Range Running Amperes Power Input Power Factor EER COP Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Control Fan Speeds Compressor Refrigerant / Amount
2-2. Major Component Specifications 2-2-1. Outdoor Unit Outdoor Unit CU-3KE19NBU Control PCB Part No. Controls Control Circuit Fuse CB-CU-3KE19NBU Microprocessor 250V 25A Compressor Type Compressor Model / Nominal Output Compressor Oil ... Amount Pints (cc) Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm DC Twin Rotary (Hermetic) 5KD240XAB21 / 1,700W FV50S ... 1.91 (900) U - V : 0.720 V - W : 0.708 W - U : 0.726 Safety Device CT (Peak current cut-off control) Compressor Discharge Temp.
Outdoor Unit CU-4KE24NBU Control PCB Part No. Controls Control Circuit Fuse CB-CU-4KE24NBU Microprocessor 250V 25A Compressor Type Compressor Model / Nominal Output Compressor Oil ... Amount Pints (cc) Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm DC Twin Rotary (Hermetic) 5KD240XAB21 / 1,700W FV50S ... 1.91 (900) U - V : 0.720 V - W : 0.708 W - U : 0.726 Safety Device CT (Peak current cut-off control) Compressor Discharge Temp.
Outdoor Unit CU-4KE31NBU Control PCB Part No. Controls Control Circuit Fuse CB-CU-4KE31NBU Microprocessor 250V 25A Compressor Type Compressor Model / Nominal Output Compressor Oil ... Amount Pints (cc) Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm DC Twin Rotary (Hermetic) 5JD420XAB22 / 3,000W FV50S ... 2.55 (1,200) U - V : 0.435 V - W : 0.441 W - U : 0.452 Safety Device CT (Peak current cut-off control) Compressor Discharge Temp.
2-3. Other Component Specifications Quantity of Sensor Model No. of sensor CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU Outdoor air temp sensor TKS295B 1 1 1 Outdoor heat exchanger sensor TKS292B 1 1 1 AW / AN sensor TKS292B 1/1 1/1 1/1 BW / BN sensor TKS292B 1/1 1/1 1/1 CW / CN sensor TKS292B 1/1 1/1 1/1 DW / DN sensor TKS292B 0 1/1 1/1 Sensor Name Resistance (k ohm) 40 35 30 25 20 15 10 5 0 Compressor temp sensor Quantity of Sensor Model No.
3. DIMENSIONAL DATA Outdoor Unit CU-3KE19NBU 15/32 14-17/32 12-19/32(320) 2-15/16 Wide tube service valve dia.3/8" (9.52) × 3 1-13/16 4-7/16 2-15/16 2-3/4 5-29/32 2-27/32 2-3/4 29-1/8(740) Narrow tube service valve dia.1/4" (6.
CU-4KE24NBU 2-15/16 Wide tube service valve dia.1/2" (12.70) × 1 Narrow tube service valve dia.1/4" (6.35) × 4 1-13/16 Wide tube service valve dia.3/8" (9.
CU-4KE31NBU 15/32 14-17/32 12-19/32(320) 2-15/16 Wide tube service valve dia.1/2" (12.70) × 2 Narrow tube service valve dia.1/4" (6.35) × 4 35-1/32(890) 1-13/16 4-7/16 2-15/16 2-3/4 2-3/4 2-7/8 2-3/4 2-3/4 Wide tube service valve dia.3/8" (9.
4. REFRIGERANT FLOW DIAGRAM 4-1. Refrigerant Flow Diagram Outdoor Unit CU-3KE19NBU Outdoor unit Wide tube O.D.3/8" Service valve on wide tube CW Sub accumulator Main accumulator BW High pressure switch H.P. O.D.3/8" AW O.D.3/8" Compressor Indoor unit Header Defrost valve for hot gas bypass Narrow tube Service valve on narrow tube CN O.D.1/4" M M BN O.D.1/4" Cooling cycle M AN O.D.
Outdoor Unit CU-4KE24NBU Outdoor unit Wide tube O.D.1/2" Service valve on wide tube DW Sub accumulator Main accumulator CW Compressor Indoor unit High pressure switch H.P. O.D.3/8" BW O.D.3/8" AW O.D.3/8" Narrow tube Service valve on narrow tube DN Electric expansion valve Defrost valve for hot gas bypass M S Heat exchanger 4-way valve Header O.D.1/4" M CN O.D.1/4" M BN O.D.1/4" O.D.
Outdoor Unit CU-4KE31NBU Outdoor unit Wide tube O.D.1/2" Service valve on wide tube DW Sub accumulator Main accumulator CW High pressure switch H.P. O.D.1/2" BW Compressor Indoor unit O.D.3/8" AW O.D.3/8" Narrow tube Electric expansion valve Service valve on narrow tube DN M O.D.1/4" S M CN O.D.1/4" M BN O.D.1/4" Cooling cycle M AN O.D.
5. PERFORMANCE DATA 5-1. Temperature Charts 5-1-1. Temperature Charts (CU-3KE19NBU) Indoor Unit CS-MKE7NKU × 1 Outdoor Unit CU-3KE19NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 188 (1.3) Lo fan Hi fan HH fan 6°F C) 30° ( p. 8 174 (1.
Indoor Unit CS-MKE9NKU × 1 Outdoor Unit CU-3KE19NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 188 (1.3) Lo fan HH fan 0°C) 174 (1.2) F (3 p. 86° m r air te Indoo ) 7 (2 °C 80°F °C) 4 (2 75°F 160 (1.1) 146 (1.
Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE12NKU × 1 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) 174 (1.2) Lo fan (1) High pressure performance chart Hi fan High pressure at wide tube service valve psig (MPaG) Low pressure at wide tube service valve psig (MPaG) (1) Low pressure performance chart HH fan °C) °F (30 p. 86 air tem Indoor ) C 7° 80°F (2 ) (24°C 75°F 160 (1.1) 146 (1.
Indoor Unit CS-MKE18NKU × 1 Outdoor Unit CU-3KE19NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics HH fan 174 (1.2) Lo fan Hi fan F . 86° or Indo 160 (1.
Indoor Unit CS-MKE9NB4U × 1 Outdoor Unit CU-3KE19NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 174 (1.2) Lo fan Hi fan High pressure at wide tube service valve psig (MPaG) Heating Characteristics Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) HH fan 160 (1.1) 6°F mp. 8 (3 r air te Indoo ) (27°C 80°F °C) 4 2 ( 75°F 146 (1.
Outdoor Unit CU-3KE19NBU Indoor Unit CS-MKE12NB4U × 1 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) High pressure performance chart 174 (1.2) Lo fan Hi fan High pressure at wide tube service valve psig (MPaG) Low pressure at wide tube service valve psig (MPaG) (1) Low pressure performance chart HH fan 160 (1.1) ) 146 (1.0) p. air tem Indoor 7°C) 80°F (2 4°C) (2 F ° 75 132 (0.
Indoor Unit CS-KE12NB4UW × 1 Outdoor Unit CU-3KE19NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 174 (1.2) High pressure at wide tube service valve psig (MPaG) Heating Characteristics Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) HH fan Lo fan Hi fan 160 (1.1) °C) F (30 146 (1.0) or air Indo 86° mp. te °C) F (27 80° 132 (0.
5-1-2. Temperature Charts (CU-4KE24NBU) Indoor Unit CS-MKE7NKU × 1 Outdoor Unit CU-4KE24NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 188 (1.3) Lo fan Hi fan High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics HH fan °C) 0 .8 mp r te ai oor 174 (1.
Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE9NKU × 1 (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 188 (1.3) Lo fan 174 (1.2) HH fan °C) °F (30 p. 86 m r air te Indoo ) C ° (27 80°F ) (24°C 75°F 160 (1.1) 146 (1.
Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE12NKU × 1 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) 174 (1.2) Lo fan Hi fan HH fan 0°C) 86°F (3 p. air tem Indoor ) C 7° 80°F (2 ) (24°C 75°F 160 (1.1) (1) High pressure performance chart High pressure at wide tube service valve psig (MPaG) Low pressure at wide tube service valve psig (MPaG) (1) Low pressure performance chart 146 (1.
Indoor Unit CS-MKE18NKU × 1 Outdoor Unit CU-4KE24NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics HH fan 174 (1.2) Lo fan Hi fan °C) F (30 ° or air . 86 temp Indo 160 (1.1) 80°F C) (27° 4°C) (2 75°F 146 (1.
Indoor Unit CS-MKE24NKU × 1 Outdoor Unit CU-4KE24NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 174 (1.2) Lo fan Hi fan High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics HH fan ) Indoor 160 (1.1) p. air tem 0°C 86°F (3 7°C) 80°F (2 4°C) (2 75°F 146 (1.
Indoor Unit CS-MKE9NB4U × 1 Outdoor Unit CU-4KE24NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 174 (1.2) Lo fan Hi fan High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics HH fan 160 (1.1) 6°F mp. 8 (3 r air te Indoo ) (27°C 80°F °C) 4 2 ( 75°F 146 (1.
Outdoor Unit CU-4KE24NBU Indoor Unit CS-MKE12NB4U × 1 Cooling Characteristics Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) High pressure performance chart 174 (1.2) Lo fan Hi fan High pressure at wide tube service valve psig (MPaG) Low pressure at wide tube service valve psig (MPaG) (1) Low pressure performance chart HH fan 160 (1.1) ) 146 (1.0) p. air tem Indoor 7°C) 80°F (2 4°C) (2 F ° 75 132 (0.
Indoor Unit CS-KE12NB4UW × 1 Outdoor Unit CU-4KE24NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 174 (1.2) High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics HH fan Lo fan Hi fan 160 (1.1) °C) F (30 146 (1.0) or air Indo 86° mp. te °C) F (27 80° 132 (0.
5-1-3. Temperature Charts (CU-4KE31NBU) Outdoor Unit CU-4KE31NBU Indoor Unit CS-MKE7NKU × 1 (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 174 (1.2) Lo fan 146 (1.0) Hi fan Hi fan High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics HH fan 0°C) mp.
Indoor Unit CS-MKE9NKU × 1 Outdoor Unit CU-4KE31NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 174 (1.2) Lo fan 146 (1.0) Hi fan HH fan 0°C) mp. 86°F (3 te Indoor air ) C 7° 80°F (2 C) 75°F (24° 118 (0.8) 90 (0.
Indoor Unit CS-MKE12NKU × 1 Outdoor Unit CU-4KE31NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 174 (1.2) Lo fan Hi fan Hi fan High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) HH fan 146 (1.0) C) p. 86°F (30° m Indoor air te ) 80°F (27°C 118 (0.8) 90 (0.
Indoor Unit CS-MKE18NKU × 1 Outdoor Unit CU-4KE31NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart Lo fan 174 (1.2) High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics Hi fan 146 (1.0) Indoor air 118 (0.8) 0°C) temp. 86°F (3 80°F (27°C) 75°F (24°C) 90 (0.
Indoor Unit CS-MKE24NKU × 1 Outdoor Unit CU-4KE31NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart Lo fan 174 (1.2) High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) Low pressure at wide tube service valve psig (MPaG) Cooling Characteristics Hi fan 146 (1.0) 118 (0.8) 90 (0.6) 77 (25) 86°F (30°C) Indoor air temp.
Indoor Unit CS-MKE9NB4U × 1 Outdoor Unit CU-4KE31NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 174 (1.2) Lo fan Hi fan Hi fan temp. 86°F Indoor air ) C 80°F (27° 146 (1.
Indoor Unit CS-MKE12NB4U × 1 Outdoor Unit CU-4KE31NBU (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart 174 (1.2) Lo fan Hi fan Hi fan 146 (1.0) HH fan C) p. 86°F (30° m Indoor air te ) 80°F (27°C 118 (0.8) 90 (0.
Outdoor Unit CU-4KE31NBU Indoor Unit CS-KE12NB4UW × 1 (RH : 85%, Indoor fan speed : High fan) (230V, 60Hz) (1) Low pressure performance chart (1) High pressure performance chart Lo fan 174 (1.2) 146 (1.0) 90 (0.6) 77 (25) Hi fan C) p. 86°F (30° Indoor air tem 118 (0.8) High pressure at wide tube service valve psig (MPaG) Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (230V, 60Hz) 80°F (27°C) 75°F (24°C) 86 95 (30) (35) Outdoor air temperature °F (°C) 362 (2.5) 290 (2.
5-2. Cooling Capacity Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE9NKU × 3 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 18,600 BTU/h INDOOR o o ENT. TEMP. F ( C) WB AIR FLOW RATE: 777 CFM OUTDOOR o o AMBIENT TEMP. F ( C) DB 65 (18.3) 75 (23.9) 85 (29.4) 95 (35.0) 105 (40.6) 115 (46.1) TC 18,680 18,040 17,350 16,800 15,990 15,120 72 (22.2) SHC 16,090 15,780 15,480 15,180 14,880 14,580 59 76 (24.
Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE12NB4U × 3 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 17,400 BTU/h INDOOR o o ENT. TEMP. F ( C) WB AIR FLOW RATE: 706 CFM OUTDOOR o o AMBIENT TEMP. F ( C) DB TC 65 (18.3) 75 (23.9) 85 (29.4) 95 (35.0) 105 (40.6) 115 (46.1) 17,460 16,880 16,260 15,760 15,020 14,220 72 (22.2) SHC 15,450 15,180 14,900 14,630 14,350 13,940 59 76 (24.4) SHC 17,460 16,880 16,260 15,760 15,020 14,220 (15.0) 80 (26.
Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-MKE9NKU × 3 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 23,200 BTU/h INDOOR o o ENT. TEMP. F ( C) WB AIR FLOW RATE: 777 CFM OUTDOOR o o AMBIENT TEMP. F ( C) DB 65 (18.3) 75 (23.9) 85 (29.4) 95 (35.0) 105 (40.6) 115 (46.1) TC 23,420 22,640 21,790 21,190 20,170 15,430 14,580 72 (22.2) SHC 18,350 17,900 17,600 17,290 16,840 59 76 (24.4) SHC 21,070 20,610 20,160 19,860 19,410 15,430 (15.0) 80 (26.
Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-KE18NB4UW + CS-MKE12NB4U + CS-MKE12NB4U Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 22,000 BTU/h INDOOR o o ENT. TEMP. F ( C) WB AIR FLOW RATE: 812 CFM OUTDOOR o o AMBIENT TEMP. F ( C) DB 65 (18.3) 75 (23.9) 85 (29.4) 95 (35.0) 105 (40.6) 115 (46.1) TC 22,200 21,450 20,630 20,050 19,080 14,380 14,380 72 (22.2) SHC 18,570 18,260 17,780 17,630 17,150 59 76 (24.
Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NKU × 4 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 30,600 BTU/h INDOOR o o ENT. TEMP. F ( C) WB AIR FLOW RATE: 1,036 CFM OUTDOOR o o AMBIENT TEMP. F ( C) DB 65 (18.3) 75 (23.9) 85 (29.4) 95 (35.0) 105 (40.6) 115 (46.1) TC 30,850 29,770 28,590 27,980 22,750 16,560 16,560 72 (22.2) SHC 24,260 23,660 23,260 22,860 20,440 59 76 (24.4) SHC 27,890 27,280 26,680 26,480 22,750 16,560 (15.0) 80 (26.
Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NB4U × 4 Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 28,600 BTU/h INDOOR o o ENT. TEMP. F ( C) WB AIR FLOW RATE: 883 CFM OUTDOOR o o AMBIENT TEMP. F ( C) DB 65 (18.3) 75 (23.9) 85 (29.4) 95 (35.0) 105 (40.6) 115 (46.1) TC 28,830 27,880 26,840 26,270 21,300 15,500 72 (22.2) SHC 22,560 22,210 21,700 21,360 19,130 15,500 59 76 (24.4) SHC 25,810 25,470 24,960 24,610 21,300 15,500 (15.0) 80 (26.
5-3. Cooling Capacity (Low Ambient) Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE9NKU × 3 Power Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > RATING CAPACITY: INDOOR ENT. TEMP. o F (o C) WB DB 18,600 BTU/h AIR FLOW RATE: OUTDOOR AMBIENT TEMP.o F (o C) 15 25 35 (-9.4) (-3.9) (1.7) 19,030 18,900 18,890 TC 59 (15.0) 63 (17.2) 67 (19.4) 71 (21.7) 75 (23.9) 777 CFM 45 (7.2) 18,960 55 (12.8) 18,810 72 76 80 84 88 (22.2) (24.4) (26.7) (28.9) (31.
Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE12NB4U × 3 Power Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > RATING CAPACITY: INDOOR ENT. TEMP. o F (o C) WB DB 17,400 BTU/h AIR FLOW RATE: OUTDOOR AMBIENT TEMP.o F (o C) 15 25 35 (-9.4) (-3.9) (1.7) 17,850 17,720 17,690 TC 59 (15.0) 63 (17.2) 67 (19.4) 71 (21.7) 75 (23.9) 706 CFM 45 (7.2) 17,750 55 (12.8) 17,600 72 76 80 84 88 (22.2) (24.4) (26.7) (28.9) (31.
Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-MKE9NKU × 3 Power Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > RATING CAPACITY: 23,200 BTU/h AIR FLOW RATE: INDOOR o o ENT. TEMP. F ( C) WB 59 (15.0) 63 (17.2) 67 (19.4) 71 (21.7) 75 (23.9) DB 72 76 80 84 88 72 76 80 84 88 72 76 80 84 88 72 76 80 84 88 76 80 84 88 (22.2) (24.4) (26.7) (28.9) (31.1) (22.2) (24.4) (26.7) (28.9) (31.1) (22.2) (24.4) (26.7) (28.9) (31.1) (22.2) (24.4) (26.7) (28.9) (31.1) (24.4) (26.7) (28.
Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-KE18NB4UW + CS-MKE12NB4U + CS-MKE12NB4U Power Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > RATING CAPACITY: INDOOR ENT. TEMP. o F (o C) WB DB 22,000 BTU/h AIR FLOW RATE: OUTDOOR AMBIENT TEMP.o F (o C) 15 25 35 (-9.4) (-3.9) (1.7) 22,260 22,160 22,190 TC 59 (15.0) 63 (17.2) 67 (19.4) 71 (21.7) 75 (23.9) 812 CFM 45 (7.2) 22,350 55 (12.8) 22,240 72 76 80 84 88 (22.2) (24.4) (26.7) (28.9) (31.
Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NKU × 4 Power Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > RATING CAPACITY: INDOOR ENT. TEMP. o F (o C) WB DB 30,600 BTU/h AIR FLOW RATE: OUTDOOR AMBIENT TEMP.o F (o C) 15 25 35 (-9.4) (-3.9) (1.7) 30,870 30,760 30,800 TC 59 (15.0) 63 (17.2) 67 (19.4) 71 (21.7) 75 (23.9) 1,036 CFM 45 (7.2) 31,010 55 (12.8) 30,890 72 76 80 84 88 (22.2) (24.4) (26.7) (28.9) (31.
Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NB4U × 4 Power Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > RATING CAPACITY: INDOOR ENT. TEMP. o F (o C) WB DB 28,600 BTU/h AIR FLOW RATE: OUTDOOR AMBIENT TEMP.o F (o C) 15 25 35 (-9.4) (-3.9) (1.7) 28,890 28,790 28,810 TC 59 (15.0) 63 (17.2) 67 (19.4) 71 (21.7) 75 (23.9) 883 CFM 45 (7.2) 28,990 55 (12.8) 28,870 72 76 80 84 88 (22.2) (24.4) (26.7) (28.9) (31.
5-4. Heating Capacity Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE9NKU × 3 Power Supply : 230V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 24,800 BTU/h OUTDOOR ENT. TEMP. o F (o C) AIR FLOW RATE: 847 CFM INDOOR AMBIENT TEMP. o F (o C) WB 60 (15.6) 65 (18.3) 70 (21.1) 75 (23.9) 80 (26.7) 0 (-17.8) TH 13,820 13,790 13,750 13,710 13,660 3 (-16.1) TH 14,280 14,250 14,220 14,170 14,120 8 (-13.3) TH 15,390 15,360 15,320 15,280 15,220 13 (-10.
Outdoor Unit : CU-3KE19NBU Indoor Unit : CS-MKE12NB4U × 3 Power Supply : 230V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 24,000 BTU/h OUTDOOR ENT. TEMP. o F (o C) AIR FLOW RATE: 803 CFM INDOOR AMBIENT TEMP. o F (o C) WB 60 (15.6) 65 (18.3) 70 (21.1) 75 (23.9) 80 (26.7) 0 (-17.8) TH 13,310 13,300 13,270 13,240 13,200 3 (-16.1) TH 13,760 13,740 13,720 13,690 13,650 8 (-13.3) TH 14,830 14,820 14,790 14,760 14,720 13 (-10.
Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-MKE9NKU × 3 Power Supply : 230V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 29,200 BTU/h OUTDOOR ENT. TEMP. o F (o C) AIR FLOW RATE: 847 CFM INDOOR AMBIENT TEMP. o F (o C) WB 60 (15.6) 65 (18.3) 70 (21.1) 75 (23.9) 80 (26.7) 0 (-17.8) TH 16,550 16,540 16,510 16,470 16,420 3 (-16.1) TH 17,100 17,080 17,050 17,010 16,960 8 (-13.3) TH 18,390 18,370 18,340 18,300 18,250 13 (-10.
Outdoor Unit : CU-4KE24NBU Indoor Unit : CS-KE18NB4UW + CS-MKE12NB4U + CS-MKE12NB4U Power Supply : 230V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 28,400 BTU/h OUTDOOR ENT. TEMP. o F (o C) AIR FLOW RATE: 918 CFM INDOOR AMBIENT TEMP. o F (o C) WB 60 (15.6) 65 (18.3) 70 (21.1) 75 (23.9) 80 (26.7) 0 (-17.8) TH 16,030 16,040 16,050 16,040 16,020 3 (-16.1) TH 16,550 16,560 16,570 16,560 16,540 8 (-13.3) TH 17,790 17,810 17,820 17,810 17,790 13 (-10.
Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NKU × 4 Power Supply : 230V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 32,000 BTU/h OUTDOOR ENT. TEMP. o F (o C) AIR FLOW RATE: 1,130 CFM INDOOR AMBIENT TEMP. o F (o C) WB 60 (15.6) 65 (18.3) 70 (21.1) 75 (23.9) 80 (26.7) 0 (-17.8) TH 17,980 17,970 17,950 17,910 17,870 3 (-16.1) TH 18,570 18,560 18,540 18,510 18,460 8 (-13.3) TH 19,990 19,980 19,950 19,920 19,870 13 (-10.
Outdoor Unit : CU-4KE31NBU Indoor Unit : CS-MKE9NB4U × 4 Power Supply : 230V Single Phase 60Hz < Heating Capacity > RATING CAPACITY: 32,000 BTU/h OUTDOOR ENT. TEMP. o F (o C) AIR FLOW RATE: 1,000 CFM INDOOR AMBIENT TEMP. o F (o C) WB 60 (15.6) 65 (18.3) 70 (21.1) 75 (23.9) 80 (26.7) 0 (-17.8) TH 17,910 17,890 17,850 17,810 17,750 3 (-16.1) TH 18,510 18,480 18,450 18,400 18,340 8 (-13.3) TH 19,940 19,920 19,880 19,830 19,770 13 (-10.
6. ELECTRICAL DATA 6-1.
Outdoor Unit CU-4KE24NBU 8FA2-5251-11500-1 69
Outdoor Unit CU-4KE31NBU 8FA2-5251-11300-1 70
7. FUNCTIONS 7-1. Explanation of Functions NOTE 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 Unit operation Breaker is ON. The ON/OFF operation button on the remote controller is pressed. Explanation Power is supplied to the indoor and outdoor unit control circuits, however the unit remains stopped.
Control/conditions HEAT The thermostat turns ON. When defrost operation begins, frost has formed on the outdoor unit (when the ambient air temperature is low). Unit operation The indoor unit is stopped. Non-stop defrost Explanation The unit operated before, and the temperature of the indoor heat exchanger is relatively warm. Therefore,the fan speed may start at the set fan speed at the same time that the thermostat turns ON.
Outdoor heat exchanger temperature (°F) Temperature of releasing Defrost operation time (- 4) Outdoor air temperature (°F) 0 (21.2) (19.4) L2 L1 Heat exchanger temperature for releasing defrosting The ON/OFF operation button on the remote controller is pressed. No releasing 57.2 °F or higher (*1) Table 1 Fig. 1 COOL 2 minutes or more *1 The temperature for releasing of defrosting is (68 °F) or higher when the outdoor air temperature is less than 32 °F. (-11.2) (-13.
Frequency control (senconds) (Hz) Outdoor air temperature is below 32 °F. Outdoor air temperature is 32 °F or higher. (25) Hz (120) seconds (60) seconds (35) Hz (60) seconds (30) seconds (45) Hz (60) seconds (30) seconds (55) Hz (180) seconds (90) seconds Table 2 (1/f fluctuation fan) Control/conditions SENSOR The ON/OFF operation button on the remote DRY controller is pressed. Unit operation The operation lamp illuminates. The indoor fan operates at the set fan speed.
1/f fluctuation fan 250 200 150 (Step) 100 50 0 6-minute cycle Fig.
< Low Ambient Cooling Operation > When the outdoor air temperature reaches 57.2 °F (14 °C ) or less during the cooling operation, the operation mode is switched to 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 ] When the mode has been switched to low ambient cooling operation, the outdoor fan speed is lowered as the outdoor air temperature falls.
7-2. Protective Functions NOTE 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. 7-2-1. Defrost Detection and Release (1) Non-stop defrosting Defrosting sequence Heating operation 4-way valve ON Defrost detection occurs in either of the following cases: The temperature of the heat exchanger remains at or below the L1 line for 35 minutes after the start of HEAT operation.
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. As a result: • Power breakers and fuses will not be tripped. • Operation can continue during this period with somewhat reduced heating or cooling capacity.
7-2-3. Low Start Current Operation starts at (8 Hz), and the start current is less than the normal operating current. This prevents the flickering of fluorescent lights or television screens that occurs when ordinary A/C units start. 7-2-4. Compressor Temperature Control To protect the compressor coil from overheating, the operating frequency is controlled based on the compressor discharge temperature. Compressor discharge temperature (°F) Trip (230) 5Hz every 30 sec. reduction (223) 2Hz every 30 sec.
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 outdoor unit controller (inverter).
8-2. Trouble Diagnosis by Error Monitor Lamps Warning To prevent electric shock, do not inspect or repair until the Power Lamp on the P.C.Board is turned off. 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) Heat Exchanger Rear side P.C.Board of Electrical Component Box.
8-3. Checking the Outdoor System 8-3-1. Checking the outdoor unit No. 1 Work procedure Check items (unit operation) • Apply 220 V AC between terminals L1 and L2 on the • The LED (red) on the control board must illuminate. outdoor unit terminal plate. 2 • Short-circuit the T-RUN terminal to the COM terminal of TEST/T-RUN terminals. • The compressor, fan motor, 4-way valve, and solenoid valve (for the hot gas bypass) must turn ON. (They turn ON about (70) seconds later after the power is turned ON.
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. Does not heat or heating performance is inadequate. Does not cool or cooling performance is inadequate. The electric expansion valve does not operate. Defrost operation does not occur. Others The outdoor air temperature is high, however defrost operation occurs. The compressor speed does not increase.
Others Does not heat or heating performance is inadequate. Does not cool or cooling performance is inadequate. The electric expansion valve does not operate. Defrost operation does not occur. Others The outdoor air temperature is high, however defrost operation occurs. The compressor speed does not increase. The compressor stops on occasion. 4-way valve does not operate. Outdoor fan dose not turn. Outdoor unit does not operate. Indoor fan dose not turn. Operation lamp does not illuminate.
(7) Electric expansion valve 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. Use a multi-meter to measure the voltage (12 V). When the power is turned ON, the needle will move in the following seguence in approximately 10 to 20 seconds for each point. Controller check Voltage varies No voltage on circuit board Model No.
(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 run, and messure the temperatures of the A/C intake air and discharge air. Compare the values with the performance charts.
8-5. Trouble Diagnosis of Fan Motor This outdoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil resistance, and the following procedure should be used to check the motor. Perform the trouble diagnosis by Test Run mode described on Installation Instructions of indoor unit. Important: (A) Turn OFF the power before connecting or disconnecting the motor connectors.
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, R22. 9-1-2. Components (mixing proportions) HFC32 (50%) / HFC125 (50%) 9-1-3.
9-2. Checklist before Servicing Use a clutch-type flare tool for R410A or the conventional flare tool. Note that sizes of the resultant flares differ between these two tools. Where a conventional flare tool is used, make sure to observe A Specification (amount of extrusion) by using the flare spacer. Specification A Diameter of tube D Flare tool for R410A Conventional flare tool (for R22) Dia.3/8" (9.52 mm) 0 to 0.0196" 0.0472" Dia.1/2" (12.7 mm) (0 to 0.5 mm) (1.2 mm) Dia.1/4" (6.35 mm) Dia.
9-3. Tools Specifically for R410A For servicing, use the following tools for R410A Tool Distinction Tool Name Gauge manifold Charging hose Gas leak detector Refrigerant cylinder Charging cylinder Refrigerant recovery unit Tools specifically for R410A 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 recommended.) Vacuum pump (*2)...can be used if the following adapter is attached.
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. for R410A." See "9-3. Tools Specifically 9-5-1. Procedure for Replacing Compressor (1) Recovering refrigerant Any remaining refrigerant inside the unit should not be released to the atmosphere, but recovered using the refrigerant recovery unit for R410A.
(5) Recharging Configuration and characteristics of cylinders Be sure to charge the specified amount of refrigerant in liquid state using the service port of the wide tube service valve. The proper amount is listed on the unit's nameplate. Valve When the entire amount cannot be charged all at once, charge gradually while operating the unit in Cooling Operation. CAUTION Never charge a large amount of liquid refrigerant at once to the unit. This may cause damage to the compressor.
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, then recharge the refrigerant. (1) Detecting Leaks Use the detector for R410A to locate refrigerant leak points.
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. CAUTION Never charge additional refrigerant if refrigerant is leaking from the unit. Follow instructions given in "9-6. In Case Refrigerant is Leaking" and completely carry out repairs. Only then should you recharge the refrigerant. 9-8.
APPENDIX A INSTALLATION INSTRUCTIONS CU-3KE19NBU CU-4KE24NBU CU-4KE31NBU (852-6-4190-584-00-2) A-1
For Outdoor Unit INSTALLATION INSTRUCTIONS Split System Air Conditioner This air conditioner uses the refrigerant R410A. NOTE External diameter of service port R410A: 5/16" Model Combinations Contents Page IMPORTANT! Please Read Before Starting .................................. 2 1. GENERAL .......................................................... 4 1-1. Tools Required for Installation (not supplied) 1-2. Accessories Supplied with Unit 1-3. Optional Copper Tubing Kit 1-4.
IMPORTANT! Please Read Before Starting When Transporting Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees when lifting to reduce strain on your back. Sharp edges or thin aluminum fins on the air conditioner can cut your fingers. 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.
Others 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. CAUTION 9HQWLODWH DQ\ HQFORVHG DUHDV ZKHQ LQVWDOOLQJ RU WHVWLQJ the refrigeration system. Escaped refrigerant gas, on contact with fire or heat, can produce dangerously toxic gas.
1. General This booklet briefly outlines where and how to install the air conditioning system. Please read over the entire set of instructions for the indoor and outdoor units and make sure all accessory parts listed are with the system before beginning. If the electric wiring diagram does not appear in this manual, please check for the diagram on the indoor unit. 1-1. Tools Required for Installation (not supplied) 1. Standard screwdriver 7. Hacksaw 2. Phillips head screwdriver 8. Core bits 3.
2. Installation Site Selection Indoor unit 2-1. Indoor Unit WARNING To prevent abnormal heat generation and the possibility of fire, do not place obstacles, enclosures and grilles in front of or surrounding the air conditioner in a way that may block air flow. Drain hose AVOID: Outside drainage direct sunlight. nearby heat sources that may affect performance of the unit. areas where leakage of flammable gas may be expected.
install the indoor unit more than 3.3' (1 m) away from any antenna or power lines or connecting wires used for television, 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. Table 3 Model Max. Allowable Tubing Length Per Unit (ft.) Max. Allowable Total Tubing Length at Shipment (L1+L2+L3) or (L1+L2+L3+L4) (ft.) Limit of Total Tubing Length (L1+L2+L3) or (L1+L2+L3+L4) (ft.
2-2. Connecting Indoor Units Figures (4a) – (4k) show the different types of indoor unit connections, including the use of a reducer. To select the required indoor unit to be connected, refer to the Combination Table that was included in the outdoor unit package. (1) Connecting indoor unit for CU-3KE19NBU (A) Outdoor unit 3/8"(9.52mm) Indoor unit (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) C 3/8"(9.52mm) 1/4"(6.35mm) 3/8"(9.52mm) B 3/8"(9.52mm) 1/4"(6.
(B) Outdoor unit 1/2"(12.70mm) Indoor unit D 1/2"(12.70mm) (CS-MKE18NKU) (CS-KE18NB4UW) 1/4"(6.35mm) 3/8"(9.52mm) C 3/8"(9.52mm) 1/4"(6.35mm) (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) 3/8"(9.52mm) B 3/8"(9.52mm) 1/4"(6.35mm) (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) 3/8"(9.52mm) A 3/8"(9.52mm) (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) 1/4"(6.35mm) Fig. 4d (C) (1/2"(12.70mm) 5/8"(15.88mm)) Locally purchased Flare 1/2"(12.
(3) Connecting indoor unit for CU-4KE31NBU (A) (1/2"(12.70mm) 3/8"(9.52mm)) Supplied Reducer Flare 1/2"(12.70mm) Union 3/8"(9.52mm) Outdoor unit 3/8"(9.52mm) D 1/2"(12.70mm) 1/4"(6.35mm) Indoor unit (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) 3/8"(9.52mm) C (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) 1/2"(12.70mm) 1/4"(6.35mm) 3/8"(9.52mm) B 3/8"(9.52mm) 1/4"(6.35mm) (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) 3/8"(9.52mm) A 3/8"(9.
(D) (1/2"(12.70mm) 5/8"(15.88mm))Locally purchased Flare 1/2"(12.70mm) Union 5/8"(15.88mm) Outdoor unit Indoor unit 5/8"(15.88mm) D (CS-MKE24NKU) 1/2"(12.70mm) 1/4"(6.35mm) 3/8"(9.52mm) C (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) 1/2"(12.70mm) 1/4"(6.35mm) 3/8"(9.52mm) B 3/8"(9.52mm) 1/4"(6.35mm) (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) 3/8"(9.52mm) A 3/8"(9.52mm) (CS-MKE7NKU,CS-MKE9NKU,CS-MKE12NKU) (CS-MKE9NB4U,CS-MKE12NB4U) 1/4"(6.
2-3. Outdoor Unit NO AVOID: Hot air heat sources, exhaust fans, etc. (Fig. 5a) damp, humid or uneven locations. Heat source Outdoor unit choose a place as cool as possible. choose a place that is well ventilated. install in a location where at least two sides are unobstructed, so that the flow of air at the intake port or exhaust port is not blocked, and so that sufficient space is ensured for maintenance to be carried out without trouble. In general the top also must be unobstructed.
(1) Recommended dimensions of the baffle plates Air Intake Baffle Air Discharge Baffle H O A 2(2- 15/64" 6 mm) I J B H C J 3(3- 1/4" 6.5 mm) K G 4(4- 1/4" 6.5 mm) C R L E Q I D A K E G F F D B G Fig. 5g Fig. 5h For Air Intake Dimensions Model CU-3KE19NBU, CU-4KE24NBU CU-4KE31NBU A B C D (inch) 25-3/16 25/32 1-31/32 (mm) 640 20 (inch) 25-3/16 25/32 (mm) 640 20 50 25 635 E F 10-5/8 10-5/8 270 270 G H I J K 25/64 25/32 19/32 25-7/8 19/64 15 657 7.
(3) Installation procedure 1. Air Intake Baffle 2. Air Discharge Baffle (1) Left side 1. Remove the panels front, top, side L and R from the unit and drill 4 holes of ø1/4 inch (6.5 mm) at the prescribed positions. 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. 2. Install the windbaffle on the unit using field supply bolts and nuts. 3. Install the windbaffle on the unit using field supply bolts and nuts. 3.
2-5. Outer Dimensions of Outdoor Unit (1) CU-3KE19NBU 5-11/32 15/32 A 2-29/32 13-19/32 14-17/32 Service valve on narrow tube side (Outer diameter 1/4"(6.35)) 2-3/4 2-3/4 Service valve on wide tube side (Outer diameter 3/8"(9.52)) 1-13/16 2-1/16 2-1/32 4-1/2 4-7/16 2-15/16 2-27/32 23/32 29-1/8 (740) A 12-19/32 35-7/16 (900) 5-29/32 23-15/16 Fig. 6a (2) CU-4KE24NBU A 5-11/32 15/32 Service valve on wide tube side (Outer diameter 1/2"(12.
2-6. Diagram of Outdoor Unit Installation Never install only a single indoor unit. Wall-mounted types Ceiling-mounted cassette types Indoor unit D Indoor unit D 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.
3. Installation Process 3-1. Embedding the Tubing 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 labels to both ends of the inter-unit cables to prevent miswiring. Securely seal the end of embedded tubing with vinyl tape in order to prevent dirt or moisture entry.
NOTE Copper tubing 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. Reamer (4) Make a flare at the end of copper tube with a flare tool.* (Figs. 10 and 11) Fig. 9 (*Use “RIDGID” or equivalent.
CAUTION Torque wrench Be sure to match refrigerant tubing and electric wiring between indoor and outdoor units. Spanner Indoor unit Outdoor unit Fig. 15 3-6. Insulation of Refrigerant Tubing Insulation IMPORTANT Thickness: min. 5/16" (8 mm) Min. 5/16" (8 mm) To prevent heat loss and wet floors due to dripping of condensation, 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) Fig.
3-7. Taping the Tubes CAUTION After a tube has been insulated, never try to bend it into a narrow curve, as this may cause the tube to break or crack. Clamp Insulated tubes (1) At this time, the 2 refrigerant tubes (and electrical wire if local codes permit) should be taped together with armoring tape. The drain hose may also be included and taped together as 1 bundle with the tubing. (2) Wrap the armoring tape from the bottom of the outdoor unit to the top of the tubing where it enters the wall.
Stopper Perform the air purge for tubes A, B, C, and D. Use the same procedures for all tubes. (1) Check that each tube (both narrow and wide tubes) between the indoor and outdoor units have been properly connected and all wiring for the test run has been completed. Note that both narrow and wide tube service valves on the outdoor unit are kept closed at this stage. (2) Using an adjustable wrench or box wrench, remove the valve caps from the service valve on both narrow and wide tubes.
(11) Replace the flare nut on the wide tube service port and fasten the flare nut securely with an adjustable wrench or box wrench. Next, mount the valve cap and tighten it with a torque wrench (the cap needs to be tightened with the torque of 180 lbs·in (200 kgf·cm)). This process is very important to prevent gas from leaking from the system. (12) Test run the air conditioner. (See page 26.
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 breaker for overcurrent protection provided in the exclusive line. (3) To prevent possible hazard due to insulation failure, the unit must be grounded.
WARNING 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 matching up numbers on terminals of the outdoor unit and respective indoor units A – D. To avoid the risk of electric shock, each air conditioner unit must be grounded.
5-4. How to Connect Wiring to the Terminal WARNING Loose wiring may cause the terminal to overheat or result in unit malfunction. A fire hazard may also exist. Therefore, be sure all wiring is tightly connected. 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. STRIP SIZE 9/32" (7 mm) (ACTUAL SIZE) How to connect wiring to the terminal Fig.
5-5. Wiring Instructions for the Outdoor Unit CAUTION Be sure to correctly align inter-unit cables A, B, C and D. Outdoor unit Terminal board 1 2 Power supply (conduit) 1 2 3 4 5 6 7 8 9 10 11 12 Power: Single-phase, 230/208VAC 60HZ Power breaker (not provided) Inter Unit (conduit) Indoor unit A A is the indoor unit with refrigerant tubing that is connected to service valve A (bottom) of the outdoor unit.
Regulations on wire size differ from locality to locality. For field wiring requirements, please refer to your local electrical codes. Make sure that the installation fully complies with all local and national regulations. Lock nut Cabinet (1) Remove access panel “C”. (Fig. 32) (2) Connect the inter-unit and power supply line according to the drawing on the panel side. Terminal block (3) Be sure to size each wire allowing approx. 4" (10 cm) longer than the required length for wiring.
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. The power and voltage are as specified. Inter-unit cables are securely fastened to the terminal board. Inter-unit cables are securely fixed.
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