TECHNICAL & SERVICE MANUAL CS-KS18NKU + CU-KS18NKU + CU-KS18NKUA CS-KS24NKU + CU-KS24NKU + CU-KS24NKUA DC INVERTER SPLIT SYSTEM AIR CONDITIONER Indoor Model No. Product Code No. 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 1. OPERATING RANGE ................................................................................................................... 6 2. SPECIFICATIONS 2-1. Unit Specifications ............................................................................................................. 2-2. Major Component Specifications ....................................................................................... 2-3. Other Component Specifications .....................................
Page 11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 11-1. Characteristics of New Refrigerant R410A ......................................................................... 11-2. Checklist before Servicing ................................................................................................... 11-3. Tools Specifically for R410A ................................................................................................ 11-4. Tubing Installation Procedures .....................
1. OPERATING RANGE Models : CS-KS18NKU + CU-KS18NKU CS-KS24NKU + CU-KS24NKU Cooling Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp. Maximum 95 °F DB / 71 °F WB 115 °F DB Minimum 67 °F DB / 57 °F WB 67 °F DB Models : CS-KS18NKU + CU-KS18NKUA CS-KS24NKU + CU-KS24NKUA Cooling Temperature Indoor Air Intake Temp. Maximum 95 °F DB / 71 °F WB 115 °F DB Minimum 67 °F DB / 57 °F WB 0 °F DB 6 Outdoor Air Intake Temp.
2. SPECIFICATIONS 2-1.
Indoor Unit Outdoor Unit CS-KS18NKU CU-KS18NKU < 208V > Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) 208V Single-Phase 60Hz Cooling 17,500 ( 4,000 t
Indoor Unit Outdoor Unit CS-KS24NKU CU-KS24NKU < 230V > Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) 230V Single-Phase 60Hz Cooling 24,200 ( 4,000 t
Indoor Unit Outdoor Unit CS-KS24NKU CU-KS24NKU < 208V > Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) 208V Single-Phase 60Hz Cooling 24,200 ( 4,000 t
Indoor Unit Outdoor Unit CS-KS18NKU CU-KS18NKUA < 230V > Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) 230V Single-Phase 60Hz Cooling 17,500 ( 4,000
Indoor Unit Outdoor Unit CS-KS18NKU CU-KS18NKUA < 208V > Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) 208V Single-Phase 60Hz Cooling 17,500 ( 4,000
Indoor Unit Outdoor Unit CS-KS24NKU CU-KS24NKUA < 230V > Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) 230V Single-Phase 60Hz Cooling 24,200 ( 4,000
Indoor Unit Outdoor Unit CS-KS24NKU CU-KS24NKUA < 208V > Dimensions & Weight Features Electrical Rating Performance Voltage Rating Total Capacity Sensible Capacity Latent Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) Available Voltage Range Running Amperes Power Input Power Factor EER SEER Compressor Locked Rotor Amperes Fuse or Circuit Breaker Capacity Controls / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) 208V Single-Phase 60Hz Cooling 24,200 ( 4,000
2-2. Major Component Specifications 2-2-1. Indoor Unit Indoor Unit CS-KS18NKU Control PCB CB-CS-KS18NKU Microprocessor 250V 3A Part No. Controls Control Circuit Fuse Fan Type Q'ty ... Dia. and Length Cross-Flow 1 ... D3-5/8 / L33-9/32 (D92/L845) inch (mm) Fan Motor Type Model ... Q'ty No. of Poles Rough Measure RPM (Cool) Nominal Output Coil Resistance (Ambient Temp.
Indoor Unit CS-KS24NKU Control PCB CB-CS-KS24NKU Microprocessor 250V 3A Part No. Controls Control Circuit Fuse Fan Type Q'ty ... Dia. and Length Cross-Flow 1 ... D3-5/8 / L33-9/32 (D92/L845) inch (mm) Fan Motor Type Model ... Q'ty No. of Poles Rough Measure RPM (Cool) Nominal Output Coil Resistance (Ambient Temp. 68 °F (20 °C)) Safety Device Type Over-Current Protection Over-Heat Protection Run Capacitor Flap Motor Type Model Rating Coil Resistance (Ambient Temp.
2-2-2. Outdoor Unit Outdoor Unit CU-KS18NKU Control PCB Part No. Controls Control Circuit Fuse CB-CU-KS18NKU Microprocessor 250V 25A Compressor Type Compressor Model / Nominal Output Pints (cc) Compressor Oil ... Amount Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm DC Twin Rotary (Hermetic) C-6RVN93H0M / 1,050W FV50S ... 0.74 (350) U - V : 0.482 V - W : 0.482 W - U : 0.482 Safety Device CT (Peak current cut-off control) Compressor Discharge Temp.
Outdoor Unit CU-KS24NKU Control PCB Part No. Controls Control Circuit Fuse CB-CU-KS24NKU Microprocessor 250V 25A Compressor Type Compressor Model / Nominal Output Compressor Oil ... Amount Pints (cc) Coil Resistance (Ambient Temp. 77 °F (25 °C)) Ohm DC Twin Rotary (Hermetic) G8T265FU1JW / 2,410W FV50S ... 1.49 (700) U - V : 0.36 V - W : 0.36 W - U : 0.36 Safety Device CT (Peak current cut-off control) Compressor Discharge Temp.
Outdoor Unit CU-KS18NKUA Control PCB Part No. Controls Control Circuit Fuse CB-CU-KS18NKUA Microprocessor 250V 25A Compressor Type Compressor Model / Nominal Output Pints (cc) Compressor Oil ... Amount Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm DC Twin Rotary (Hermetic) C-6RVN93H0M / 1,050W FV50S ... 0.74 (350) R - S : 0.482 S - T : 0.482 T - R : 0.482 Safety Device CT (Peak current cut-off control) Compressor Discharge Temp.
Outdoor Unit CU-KS24NKUA Control PCB Part No. Controls Control Circuit Fuse CB-CU-KS24NKUA Microprocessor 250V 25A Compressor Type Compressor Model / Nominal Output Compressor Oil ... Amount Pints (cc) Coil Resistance (Ambient Temp. 77 °F (25 °C)) Ohm DC Twin Rotary (Hermetic) G8T265FU1JW / 2,410W FV50S ... 1.49 (700) U - V : 0.36 V - W : 0.36 W - U : 0.36 Safety Device CT (Peak current cut-off control) Compressor Discharge Temp.
2-3.
3.
Outdoor Unit CU-KS18NKU CU-KS18NKUA 23-15/16 5-11/32 13-5/32 Wide tube service valve dia.1/2" (12.70) 2-17/32 Narrow tube service valve dia.1/4" (6.
Outdoor Unit CU-KS24NKU CU-KS24NKUA D: 15 15/32 14-17/32 13-19/32 12-19/32(320) 2-I ID :23 /32 Narrow tube service valve dia.1/4" (6.35) 2-15/16 Wide tube service valve dia.5/8" (15.
4. REFRIGERANT FLOW DIAGRAM 4-1. Refrigerant Flow Diagram CS-KS18NKU CS-KS24NKU Outdoor Unit CU-KS18NKU CU-KS18NKUA Indoor unit CU-KS24NKU CU-KS24NKUA Outdoor unit Wide tube Wide tube service valve Accumulator Muffler *1 Heat exchanger Heat exchanger High pressure switch H.P. Compressor Indoor Unit Narrow tube O.D. 1/4" (6.35 mm) Electric expansion valve Narrow tube service valve M Cooling cycle *1 O.D.1/2"(12.7mm) ... CS/CU-KS18NKU CU-KS18NKUA O.D.5/8"(15.88mm) ...
5. PERFORMANCE DATA 5-1. Temperature Charts Indoor Unit CS-KS18NKU Outdoor Unit CU-KS18NKU Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V) Low pressure at wide tube service valve psig(MPaG) (1) Low pressure performance chart 174 (1.2) Lo fan Hi Fan 159 (1.1) 145 (1.0) 131 (0.9) or A Indo .86 emp 0°C) ° F (3 ir T C) (27° 80°F C) (24° 75°F 117 (0.8) 104 (0.7) 90 (0.6) 76 (0.5) 68 (20) 77 (25) 86 (30) 95 (35) 104 (40) Outdoor inlet air DB temp.
Indoor Unit CS-KS18NKU Outdoor Unit CU-KS18NKUA Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V) Low pressure at wide tube service valve psig(MPaG) (1) Low pressure performance chart 174 (1.2) Lo fan Hi Fan 159 (1.1) 145 (1.0) 0°C) F (3 .86° 131 (0.9) or A Indo 117 (0.8) mp ir Te C) (27° 4°C) °F (2 80°F 75 104 (0.7) 90 (0.6) 76 (0.
Indoor Unit CS-KS24NKU Outdoor Unit CU-KS24NKU Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V) Low pressure at wide tube service valve psig(MPaG) (1) Low pressure performance chart 174 (1.2) Lo fan Hi Fan 159 (1.1) °C) F (30 p.86° 145 (1.0) 131 (0.9) r Indoo 117 (0.8) em Air T ) (27°C 80°F ) C ° (24 75°F 104 (0.7) 90 (0.6) 76 (0.5) 68 (20) 77 (25) 86 (30) 95 (35) 104 (40) Outdoor inlet air DB temp.
Indoor Unit CS-KS24NKU Outdoor Unit CU-KS24NKUA Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V) Low pressure at wide tube service valve psig(MPaG) (1) Low pressure performance chart 174 (1.2) Lo fan Hi Fan 159 (1.1) 145 (1.0) 30 6°F ( mp.8 ir Te A r o Indo ) (27°C 80°F ) (24°C 75°F 131 (0.9) 117 (0.8) °C) 104 (0.7) 90 (0.6) 76 (0.
5-2. Cooling Capacity Indoor Unit : CS-KS18NKU Outdoor Unit : CU-KS18NKU / CU-KS18NKUA Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 17,500 BTU/h INDOOR ENT. TEMP. oF (oC) 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 AIR FLOW RATE: 524 CFM OUTDOOR o o AMBIENT TEMP. F ( C) 65 (18.3) 75 (23.9) 85 (29.4) 95 (35.0) 105 (40.6) 115 (46.1) TC CI 16,270 0.87 16,440 1.04 16,590 1.
Indoor Unit : CS-KS24NKU Outdoor Unit : CU-KS24NKU / CU-KS24NKUA Power Supply : 230V Single Phase 60Hz < Cooling Capacity > RATING CAPACITY: 24,200 BTU/h INDOOR ENT. TEMP. oF (oC) 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 AIR FLOW RATE: 659 CFM OUTDOOR AMBIENT TEMP. oF (oC) 65 (18.3) 75 (23.9) 85 (29.4) 95 (35.0) 105 (40.6) 115 (46.1) TC CI 21,050 1.39 21,240 1.65 21,410 1.91 21,470 2.
5-3. Cooling Capacity (Low Ambient) Indoor Unit : CS-KS18NKU Outdoor Unit : CU-KS18NKUA Power Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > RATING CAPACITY: 17,500 BTU/h AIR FLOW RATE: INDOOR ENT. TEMP. oF (oC) WB 59 (15.0) 63 (17.2) 67 (19.4) 71 (21.7) 75 (23.9) OUTDOOR AMBIENT TEMP. oF (oC) DB 72 76 80 84 88 72 76 80 84 88 72 76 80 84 88 72 76 80 84 88 76 80 84 88 524 CFM 0 (-17.8) 5 (-15.0) 15 (-9.4) 25 (-3.9) 35 (1.7) 45 (7.2) 55 (12.8) TC CI 15,050 0.
Indoor Unit : CS-KS24NKU Outdoor Unit : CU-KS24NKUA Power Supply : 230V Single Phase 60Hz < Cooling Capacity (Low Ambient) > RATING CAPACITY: 24,200 BTU/h AIR FLOW RATE: INDOOR ENT. TEMP. oF (oC) WB 59 (15.0) 63 (17.2) 67 (19.4) 71 (21.7) 75 (23.9) OUTDOOR AMBIENT TEMP. oF (oC) DB 72 76 80 84 88 72 76 80 84 88 72 76 80 84 88 72 76 80 84 88 76 80 84 88 659 CFM 0 (-17.8) 5 (-15.0) 15 (-9.4) 25 (-3.9) 35 (1.7) 45 (7.2) 55 (12.8) TC CI 21,090 1.26 21,110 1.30 20,980 1.20 21,210 0.
5-4. Air Throw Distance Charts Indoor Unit Cooling CS-KS18NKU Room air temp. : Fan speed : 80°F (26.7°C) High Horizontal distance (ft.) 0 5 10 15 20 Axis air velocity (ft./sec.) Vertical distance (ft.
Indoor Unit Cooling CS-KS24NKU Room air temp. : Fan speed : 80°F (26.7°C) High Horizontal distance (ft.) 0 5 10 15 20 Axis air velocity (ft./sec.) Vertical distance (ft.
6. ELECTRICAL DATA 6-1. Electrical Characteristics Indoor Unit CS-KS18NKU Outdoor Unit CU-KS18NKU Cooling < 230V > Indoor Unit Fan Motor Performance at Rating conditions Rating conditions: Running amp. Power input Indoor air temperature: Outdoor air temperature: A W 0.3 32 Outdoor Unit Fan Motor + Compressor 230V Single-phase 60Hz 6.7 1,468 < 208V > Indoor Unit Fan Motor Rating conditions: 7.0 1,500 80 °F (26.7 °C) DB / 67 °F (19.
Indoor Unit CS-KS24NKU Outdoor Unit CU-KS24NKU Cooling < 230V > Indoor Unit Fan Motor Performance at Rating conditions Rating conditions: Running amp. Power input Indoor air temperature: Outdoor air temperature: A W 0.5 55 Outdoor Unit Fan Motor + Compressor 230V Single-phase 60Hz 10.3 2,405 < 208V > Indoor Unit Fan Motor Rating conditions: 10.8 2,460 80 °F (26.7 °C) DB / 67 °F (19.4 °C) WB 95 °F (35 °C) DB Cooling Performance at Rating conditions Complete Unit Running amp.
6-2. Electric Wiring Diagrams CS-KS18NKU CS-KS24NKU To avoid electrical shock hazard, be sure to disconnect power before checking, servicing and/or cleaning any electrical parts.
Outdoor Unit CU-KS18NKU CU-KS18NKUA WARNING To avoid electrical shock hazard, be sure to disconnect power before checking, servicing and/or cleaning any electrical parts.
Outdoor Unit CU-KS24NKU To avoid electrical shock hazard, be sure to disconnect power before checking, servicing and/or cleaning any electrical parts.
Outdoor Unit CU-KS24NKUA To avoid electrical shock hazard, be sure to disconnect power before checking, servicing and/or cleaning any electrical parts.
7. MAINTENANCE Tab 7-1. Address Setting of the Remote Control Unit The address can be set in order to prevent interference between remote controllers when two Sanyo indoor units are installed near each other. The address is normally set to "A." To set a different address, it is necessary to change the address on the second remote controller. Fig. 1 NOTE Once changed, you cannot restore the original address setting of the air conditioner. (1) Switch on the power source.
7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit One of the two types of connectors illustrated at left is used. Their basic structure is the same for each. How to Disconnect Hold the resin connector cover, and pull the connector off. You cannot disconnect the connector by pulling the wire since it is locked inside. Always hold the cover to disconnect. (See illustration at left.) For the connector without the resin cover, push the lock in the direction of "2" while pulling it off.
8. FUNCTIONS 8-1. Operation Functions Emergency operation SENSOR DRY Emergency operation is available when the remote controller malfunctions, has been lost, or otherwise cannot be used. During DRY operation, the system adjusts the room temperature and fan speed according to the conditions in the room, in order to maintain a comfortable room environment. SENSOR DRY operation DRY operation is as shown in the figure below.
HIGH POWER NIGHT SETBACK This function acts to raise the power but keeps the AC system in the same operating mode. This function is set with the HIGH POWER button on the remote controller. (It can be set regardless of the temperature and fan speed settings.) When NIGHT SETBACK operation is set, the temperature and fan speed settings will be adjusted automatically to allow comfortable sleep. When NIGHT SETBACK operation is set, " mark" appears on the remote controller.
8-2. Protective Functions Compressor discharge temperature control Freeze prevention This function controls the operation frequency to prevent the compressor discharge temperature from rising more than a specified temperature. Indoor heat exchanger temperature °F(°C) During COOL or DRY operation, freezing is detected and operation is stopped when the temperature of the indoor heat exchanger matches the conditions below. 1.
9. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE) 9-1. Precautions before Performing Inspection or Repair After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair. High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge (charging voltage DC 310V) even after the power is turned OFF, and some time is required for the charge to dissipate.
(1) Self-diagnostics Lamps INDOOR UNIT (1) OPERATION lamp (2) TIMER lamp (3) QUIET lamp OPERATION button REMOTE CONTROL receiver Since the indications cover various units, the corresponding parts listed below may not be present in some models. .... OFF INDICATION ON INDOOR UNIT QUIET (3) TIMER (2) OPERATION (1) CODE S01 S02 S03 S04 S05 DIAGNOSIS CONTENTS POSSIBLE MALFUNCTION COMPRESSOR TEMP.
(2) If the self-diagnostics function fails to operate Check the indoor unit. No indicators illuminate and the indoor fan does not rotate. Check the power voltage. Blown Is the fuse blown? Normal Replace the circuit board or the fuse. Replace the controller.
9-3. Checking the Indoor and Outdoor Units (1) Checking the indoor unit No. 1 Control Use the remote controller to operate the unit in "TEST run" mode. To determine whether the mode is currently in "TEST run" mode, check the 4 indicator lamps on the unit. If all 4 are blinking, the current mode is "TEST run." Check items (unit operation) • The rated voltage must be present between inter-unit wirings 1 and 2. • Connect a 5 k ohm resistor between inter-unit wirings 2 and 3.
(3) Serial Communication Error Identification Procedure If the lamps on the main body show the following conditions after the completion of self-diagnostics, a communication error between the indoor unit and outdoor unit might be considered. In such a case, identify the breakdown section by using the following procedure. Refer to "Method of Self-Diagnostics" for the self-diagnostics procedure.
( Continued from the previous page A. ) A ( Continued from the previous page B. ) B Is the voltage of about DC22V to 24V given between the terminals 2 and 3 on the indoor unit terminal strip (Serial Communication Line) ? (Fig. 2) Yes No Defect in the indoor unit P.C. board Defect or connection error in the inter-unit cable Outdoor Unit 1. Turn OFF the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF. 2.
(3-2) Condition: E12 Troubleshooting Serial Communication Outdoor Unit 1 2 3 4 5 6 Power 1. Turn off the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF. 2. Disconnect the cable from the terminal 3 on the Outdoor unit terminal strip. (Fig. 6) 1 2 3 Indoor Unit Fig. 6 1. Turn ON the power and operate the system using the remote controller or the operation button on the indoor unit. 2. Perform the self-diagnosis five seconds after the operation start.
9-4. Trouble Diagnosis of Fan Motor 9-4-1. Indoor Fan Motor This indoor 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. To perform diagnosis, operate the unit in cooling mode with indoor fan speed "High". Next, make sure that the indoor unit receive the signals from the remote controller when the ON/OFF operation button is pressed.
9-4-2. Outdoor 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. Important: (A) Turn OFF the power before connecting or disconnecting the motor connectors.
9-5. Noise Malfunction and Electromagnetic Interference An inverter A/C operates using pulse signal control and high frequencies. Therefore, it is susceptible to the effects of external noise, and is likely to cause electromagnetic interference with nearby wireless devices. A noise filter is installed for ordinary use, preventing these problems. However, depending on the installation conditions, these effects may still occur. Please pay attention to the points listed below.
10. CHECKING ELECTRICAL COMPONENTS Ground wire 10-1. Measurement of Insulation Resistance Clip The insulation is in good condition if the resistance exceeds 1M ohm. Probe 10-1-1. Power Supply Cord Insulation tester Clamp the grounding wire of power cord with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on either of the two power wires. (Fig. 1) Then also measure the resistance between the grounding and other power terminals. (Fig. 1) Fig.
10-2. Checking Continuity of Fuse on PCB Ass'y Fuse Remove the PCB Ass'y from the electrical component box. Then pull out the fuse from the PCB Ass'y. (Fig. 5) Check for continuity using a multimeter as shown in Fig. 6. PCB Ass'y Fig. 5 Fuse Fig.
11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 11-1. Characteristics of New Refrigerant R410A 11-1-1. 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. 11-1-2. Components (mixing proportions) HFC32 (50%) / HFC125 (50%) 11-1-3.
11-2. 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.
11-3. 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.
11-5. 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. Specifically for R410A." See "11-3. Tools 11-5-1. 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 Liquid Never charge a large amount of liquid refrigerant at once to the unit. This may cause damage to the compressor.
11-6. 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.
11-7. Charging Additional Refrigerant 11-7-1. 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 "11-6. In Case Refrigerant is Leaking" and completely carry out repairs. Only then should you recharge the refrigerant. 11-8.
APPENDIX A Operating Instructions CS-KS18NKU + CU-KS18NKU + CU-KS18NKUA CS-KS24NKU + CU-KS24NKU + CU-KS24NKUA (852-6-4181-210-00-1) A-1
Operating Instructions Split System Air Conditioner Model No. Indoor Units Outdoor Units CS-KS18NKU CS-KS24NKU CU-KS18NKU CU-KS18NKUA CU-KS24NKU CU-KS24NKUA This air conditioner uses the refrigerant R410A. Before operating the unit, read these operating instructions thoroughly and keep them for future reference.
FEATURES This air conditioner is an inverter type unit that automatically adjusts capability as appropriate. Details on these functions are provided below; refer to these descriptions when using the air conditioner. • Microprocessor Controlled Operation The interior compartment of the remote controller contains several features to facilitate automatic operation, easy logically displayed for easy use.
INSTALLATION LOCATION • We recommend that this air conditioner be installed properly by qualified installation technicians in accordance with the Installation Instructions provided with the unit. Before installation, check that the voltage of the electric supply in your home or office is the same as the voltage shown on the nameplate. • • • Avoid: Do not install this air conditioner where there are fumes or flammable gases, or in an extremely humid space such as a greenhouse.
• • • • • • CAUTION • • • • • • • • NOTICE 4 To prevent possible hazards from insulation failure, the unit must be grounded. Do not clean inside the indoor and outdoor units by users. Engage authorized dealer or specialist for cleaning. In case of malfunction of this appliance, do not repair by yourself. Contact to the sales dealer or service dealer for a repair. Refrigerant gas leakage may cause fire. For safety, be sure to turn the air conditioner off and also to disconnect the power before cleaning.
NAMES OF PARTS Air Intakes INDOOR UNIT Air Outlet Remote Controller Drain Hose Refrigerant Tubes OUTDOOR UNIT Air Outlet NOTE This illustration is based on the external view of a standard model. Consequently, the shape may differ from that of the air conditioner which you have selected. This air conditioner consists of an indoor unit and an outdoor unit. You can control the air conditioner with the remote controller.
UNIT DISPLAY AND OPERATION BUTTON INDOOR UNIT IMPORTANT Avoid using radio equipment such as mobile phone near (within 4 ft (1.2m).) the remote control receiver. Some radio equipment may cause malfunction of the unit. QUIET OPERATION button If the trouble happens, disconnect power and restart the air conditioner after a few minutes.
REMOTE CONTROLLER (DISPLAY) Displayed when transmitting data Displayed when indoor unit sensor is in use Displayed when setting temperature Displayed when temperature is shown Displayed when setting timer Displayed when the time display is set to 12-hour time. Symbols (1) Operation mode MILD DRY .............................. COOL ..................................... FAN ........................................ (2) Fan speed (4) Timer 24-hour clock with ON/OFF program Timer........................
REMOTE CONTROLLER Sensor Transmitter (Cover closed) Display ON/OFF operation button QUIET button 1 HR. TIMER button Temperature setting buttons (TEMP.
REMOTE CONTROLLER (CONTINUED) Temperature setting buttons (TEMP.) MODE selector button (DRY) (COOL) (FAN) FAN SPEED selector button Press the button to increase the set temperature. Press the button to reduce the set temperature. The temperature setting changes by 1 °C or 2 °F each time one of the TEMP. buttons is pressed. Use this button to select DRY, COOL or FAN mode. : The air conditioner reduces the humidity in the room. : The air conditioner makes the room cooler.
REMOTE CONTROLLER (CONTINUED) Temperature Display Selector button Time Display Selector button ACL button (ALL CLEAR) ADDRESS switch This switches the temperature display between °C and °F. This switches the time display between 24-hour time and 12-hour time. Puts the remote controller into pre-operation status. Always press this button after replacing the batteries.
USING THE REMOTE CONTROLLER (CONTINUED) How to Use the Remote Controller When using the remote controller, always point the unit’s transmitter head directly at the air conditioner’s receiver. Air Conditioner (Indoor unit) Receiver (Transmitter head) Remote Controller Remote Controller Installation Position The remote controller may be operated either from a non-fixed position or from a wall-mounted position.
OPERATION WITH THE REMOTE CONTROLLER 1. Operation STEP 2 STEP 3 STEP 1 STEP 4 STEP 5 NOTE Check that the circuit breaker on the power panel is turned on. Press the setting buttons as described below and change the settings as desired. STEP 1 Press the MODE selector button and select the desired mode. For dehumidifying operation o For cooling operation o For fan only operation o STEP 2 To start the air conditioner, press the ON/OFF operation button. STEP 3 Press the TEMP.
OPERATION WITH THE REMOTE CONTROLLER (CONTINUED) NOTE • Choose the best position in the room for the remote controller, which also acts as the sensor for room comfort and transmits the operating instructions. Once you’ve found this best position, always keep the remote controller there. • This appliance has a built-in 5-minute time delay circuit to ensure reliable operation. When the operation button is pressed, the compressor will start running within three minutes.
OPERATION WITH THE REMOTE CONTROLLER (CONTINUED) 4. Night Setback Mode Night Setback Mode is used for saving energy. Press the NIGHT SETBACK button while unit is operating. (except FAN mode) The mark appears in the display. To release the night setback function, press the NIGHT SETBACK button again. NOTE Pressing the MODE selector button cancels Night Setback mode.
OPERATION WITH THE REMOTE CONTROLLER (CONTINUED) 5. QUIET Mode QUIET Mode is used to reduce the fan sound of the indoor unit. Press the QUIET button. The mark appears in the display. To cancel, press QUIET button again. • • In QUIET Mode, the fan rotates at a slower speed than the fan speed setting. If the unit is already operating with a very low airflow, the fan sound may not change even if the QUIET button is pressed. 6.
SPECIAL REMARKS ‘‘DRY’’ ( ) Operation How it works? • • • Cooling ( ) Operation Power failure during operation Once the room temperature reaches the level that was set, the unit’s operation frequency is changed automatically. During DRY operation, the fan speed automatically runs at lower speed for providing a comfortable breeze. ‘‘DRY’’ operation is not possible if the indoor temperature is 59 °F or less.
SETTING THE TIMER NOTE 1. How to set the present time In the descriptions below, the following settings are used for the temperature and time indicator selector button on the bottom front section of the remote controller. • Temperature: °F • Time: AM, PM (Example) To set to 10:30 pm. Operation 2. How to set the OFF time Indication 1. Press the CLOCK button once if the time indicator is not flashing. The time indication alone flashes. 2.
SETTING THE TIMER (CONTINUED) 3. How to set the ON time (Example) To start operation at 7:10 am. Operation 4. How to set DAILY ON/OFF REPEAT timer Indication 1. Press the ON TIME setting button once. The timer indication is displayed, and the present ON time is shown. 2. Press the Advance, Return ( , ) button until AM 7:10 is displayed. The timer indication blinks. The time can be set in 10-minute increments. Holding down the button advances the time rapidly in 10-minute increments. 3.
USING THE 1-HOUR OFF TIMER 1. 1-Hour OFF Timer This function causes the unit to operate for one hour and then stop, regardless of whether the unit is on or off when this button is pressed. The indicator in the display indicates that this function is operating. Setting procedure: Regardless of whether the unit is operating or stopped, press the 1 HR. TIMER button. appears in the display.
ADJUSTING THE AIRFLOW DIRECTION 1. Horizontal CAUTION 2. Vertical The horizontal airflow can be adjusted by moving the vertical vanes with your hands to the left or right. When the humidity is high, the vertical vanes should be in the front position during the cooling or dehumidifying operation. If the vertical vanes are positioned all of the way to the right or left, condensation may begin to form around the air vent and drip down.
OPERATION WITHOUT THE REMOTE CONTROLLER INDOOR UNIT If you have lost the remote controller or it has trouble, follow the steps below. When the air conditioner is not running Each time the OPERATION button is pressed, the operation mode changes cyclically. Cooling operation Stop OPERATION button NOTE The temperature is set to the room temperature minus 4 °F during the cooling operation, and the fan speed and flap are set to Auto. CARE AND CLEANING 1.
CARE AND CLEANING (CONTINUED) Filter How to remove the filter The filter behind the air intake grille should be checked and cleaned at least once every two weeks. 1. Grasp both ends of the air intake grille, and remove it by opening towards the front and pulling towards you. Air intake grille 2. Remove the filter attached to the rear of the air intake grille. Cleaning How to replace the filter filter Use a vacuum cleaner to remove light dust.
CARE AND CLEANING (CONTINUED) Cleaning the main unit and Remote Controller • • • Removing and remounting the air intake grille CAUTION Washing the grille with water Wipe clean using a soft, dry cloth. To remove stubborn dirt, moisten a cloth in warm water no hotter than 104 °F, wring thoroughly, and then wipe. The air intake grille can be removed in order to wash it with water. Refer to “How to remove the filter” and “How to replace the filter” on page 22.
TROUBLESHOOTING (BEFORE CALLING FOR SERVICE) If your air conditioner does not work properly, first check the following points before requesting service. If it still does not work properly, contact your dealer or service center. Trouble Air conditioner does not run at all. Possible Cause Remedy 1. Power failure. 1. Restore power. 2. Leakage circuit breaker tripped. 2. Contact service center. 3. Line voltage is too low. 3. Consult your electrician or dealer. 4.
SPECIFICATIONS Model No. Power Source Cooling Capacity Heating Capacity kW BTU/h kW BTU/h Cooling Outdoor (Hi) dB(A) Operation Operation Indoor(H/M/L) Sound Heating Outdoor (Hi) dB(A) Operation Indoor(H/M/L) Unit Dimensions (H×W×D) inch(mm) (Indoor unit : Include panel) lbs.(kg) Net Weight Model No.
APPENDIX B INSTALLATION INSTRCTIONS CS-KS18NKU + CU-KS18NKU + CU-KS18NKUA CS-KS24NKU + CU-KS24NKU + CU-KS24NKUA (852-6-4190-576-00-0) A-2
INSTALLATION INSTRUCTIONS Split System Air Conditioner This air conditioner uses the refrigerant R410A. NOTE Contents Page External diameter of service port R410A: 5/16" Model Combinations 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 leakfree connection. CAUTION &KHFN FDUHIXOO\ IRU OHDNV EHIRUH VWDUWLQJ WKH WHVW UXQ 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 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 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. 1-1. Tools Required for Installation (not supplied) 1. Standard screwdriver 2. Phillips head screwdriver 3. Knife or wire stripper 4. Tape measure 5.
1-5. Additional Materials Required for Installation 1. 2. Indoor unit Refrigeration (armored) tape Insulated staples or clamps for connecting wire (See local codes.) Putty Refrigeration lubricant Clamps or saddles to secure refrigerant tubing 3. 4. 5. Drain hose 2. Installation Site Selection Outside drainage 2-1. Indoor Unit WARNING Fig.
2-2. Outdoor Unit NO AVOID: Heat source DO: choose a place as cool as possible. choose a place that is well ventilated. allow enough room around the unit for air intake/ exhaust and possible maintenance. (Fig.
2-3. Baffle Plate for the Outdoor Unit (CU-KSxxNKUA models only) Air intake baffle NOTE Wind It is recommended to use baffle plates for models CU-KS18NKUA and CU-KS24NKUA. The baffle plates are not normally required for the other models. Front When the outdoor unit is installed in a position exposed to strong wind (such as seasonal winds with low air temperature in winter), baffle plates must be installed on the outdoor unit. (Fig.
(1) Recommended dimensions of the baffle plates Air Intake Baffle Air Discharge Baffle H O A 2- 15/64" (2- 6 mm) I B H J 3(3- J 1/4" 6.5 mm) C K 4(4- 1/4" 6.5 mm) G C R L E Q I D A K E G F F D B G Fig. 5g Fig.
(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 positions. 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.
3. How to Install the Indoor Unit 3-1. Remove the Rear Panel from the Unit (1) Remove and discard the set screw on the rear panel. (Fig. 6) (2) Press the 2 marks on the frame cover and disengage the stationary tabs from the frame. (Fig. 7) Set screw only for transportation (3) Remove the rear panel. Fig. 6 NOTE Tubing can be extended in 5 directions as shown in Fig. 8. Select the direction you need providing the shortest run to the outside unit.
(4) Using a sabre saw, key hole saw or hole-cutting drill attachment, cut a hole in the wall. See Table 4 and Fig. 10. NOTE Hole should be made at a slight downward slant to the outdoor side. Table 4 Indoor side Hole Dia. Outdoor side 3-5/32" (80 mm) (5) Measure the thickness of the wall from the inside edge to the outside edge and cut PVC pipe at a slight angle 1/4" (6 mm) shorter than the thickness of the wall. (Fig. 11) Fig.
Grille Air intake grille 3-4. Remove the Grille to Install the Indoor Unit Basically, these models can be installed and wired without removing the grille. If access to any internal part is needed, follow the steps as given below. How to remove the grille (1) Grasp both ends of the air intake grille, and remove it by opening towards the front and pulling towards you. (Fig. 16a) Fig. 16a (2) Remove the 3 screws. (Fig. 16b) (3) Remove the screw on the right side cover plate and open the cover. (Fig.
3-5. Shape the Indoor Side Tubing (1) Arrangement of tubing by direction Frame a) Right or left tubing Cut out the corner of the right/left frame with a hacksaw or the like. (Figs. 20 and 21) Left tubing outlet b) Right-rear or left-rear tubing In this case, the corner of the frame need not be cut. (2) To mount the indoor unit on the rear panel: Fig. 20 Hang the 2 mounting slots of the unit on the upper tabs of the rear panel. (Fig. 22) Frame 3-6.
3-7. Recommended Wire Length and Diameter Regulations on wiring diameter differ from locality to locality. For field wiring requirements, please refer to your local electrical codes. Carefully observe these regulations when carrying out the installation. Table 5 lists recommended wire lengths and diameters for power supply systems. NOTE Refer to the wiring system diagram (Fig. 23) for the meaning of (A), (B), and (C) in Table 5.
3-8. Wiring Instructions for Inter-unit Connections Rear panel (1) Insert the inter-unit wiring (according to local codes) into the through-the-wall PVC pipe. Run the wiring toward the indoor side allowing approx. 10" (25 cm) to extend from the wall face. (Fig. 24) Wall Plastic cover (2) Grasp both ends of the air intake grille, and remove it by opening towards the front and pulling towards you. Wiring 10" (25 cm) (3) Remove the screw on the right side cover plate and open the cover. (Fig. 25) Fig.
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 How to connect wiring to the terminal 9/32" (7 mm) (ACTUAL SIZE) a) For Indoor Unit Fig.
3-9. Mounting (1) To install the indoor unit, mount the indoor unit onto the 2 tabs on the upper part of the rear plate. (2) Hold down the air discharge outlet and press the lower part of the indoor unit until it clicks to securely fasten to the 2 tabs on the lower part of the rear plate. (Fig. 33) Push NOTE For tubing, choose either the right or left tubing direction and follow the steps below.
Left-side tubing Rear panel (1) Lead the tubing and drain hose through the wall, allowing sufficient length for connection. Then bend the tubing using a tube bender to make the attachment. (Fig. 38) Hole in wall Bent part (2) Switch the drain hose and drain cap. Wide tube Narrow tube Fig. 38 Switching drain hose and drain cap (a) Locate the drain hose and the drain cap. (Fig. 39) (b) Remove the screw fastening the drain hose on the right side, and pull out the drain hose to remove it. (Fig.
To unmount indoor unit Press the 2 marks on the lower part of the indoor unit and unlatch the tabs. Then lift the indoor unit and unmount. (Fig. 42) 3-10. Drain Hose a) The drain hose should be slanted downward to the outdoors. (Fig. 43) b) Never form a trap in the course of the hose. c) If the drain hose will run in the room, insulate the hose with insulation* so that chilled condensation will not damage furniture or floors. (Fig. 44) Push * Foamed polyethylene or its equivalent is recommended.
4. How to Install the Outdoor Unit First refer to Section 2. Installation Site Selection. 4-1. Wiring Instructions for the Outdoor Unit Lock nut 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. Cabinet (1) Remove access panel “C”. (Fig. 46) (2) Connect the inter-unit and power supply line according to the drawing on the panel side.
5. Refrigerant Tubing Deburring After Before 5-1. Use of the Flaring Method Many of the conventional split system air conditioners employ the flaring method to connect refrigerant tubes which run between indoor and outdoor units. In this method, the copper tubes are flared at each end and connected with flare nuts. 5-2. Flaring Procedure with a Flare Tool (1) Cut the copper tube to the required length with a tube cutter. It is recommended to cut approx.
5-4. Connecting Tubing between Indoor and Outdoor Units a) b) Torque wrench Tightly connect the indoor side refrigerant tubing extended from the wall with the outdoor side tubing. (Fig. 52) Spanner Indoor unit To fasten the flare nuts, apply specified torque as: Table 6 Outdoor unit Tube Dia. Nut Tightening Torque 1/4" (6.35 mm) 21/32" (17 mm) Approx. 120 – 160 lbs·in (140 – 180 kgf·cm) 3/8" (9.52 mm) 7/8" (22 mm) Approx. 300 – 360 lbs·in (340 – 420 kgf·cm) 1/2" (12.
6. Air Purging Indoor unit Air and moisture remaining in the refrigerant system have undesirable effects as indicated below. Therefore, they must be purged completely.
(5) With the vacuum pump still running, close the “Lo” knob of the manifold valve. Then stop the vacuum pump. 90° (1/4 turn) Narrow tube (6) With the hex wrench, turn the valve stem on the narrow tube service valve counter-clockwise by 90 degrees (1/4 turn) for 10 seconds, and then turn the stem clockwise to close it again. (Fig. 58) CAUTION Hex wrench Wide tube Be sure to completely insert the hex wrench before attempting to turn the valve.
How to Test Run the Air Conditioner After turning on the power of the air conditioner, use the remote controller and follow the steps below to conduct the test run. (1) Set the remote controller in Test Run mode. (Fig. 59a) a)Press and hold the QUIET button and the 1HR. TIMER button. b)Then press and hold the ACL (Reset) button with a pointed object such as the tip of a pen. After 5 seconds, release the ACL button first. ON/OFF operation button QUIET button c) Then release the QUIET and 1HR.
Basic Functions of the Service Valves The basic functions of the service valves are given in Table 8 below. Table 8 Narrow Tube Service Valve (2-Way) Action Wide Tube Service Valve (3-Way) O-ring CLOSED Valve cap Stem Shipping Fully OPEN Operating and test running the air conditioner Fully OPEN Measuring pressure * and gas charging CLOSED Air purging with * The service port on the wide tube service valve uses a Schrader core valve to access the refrigerant system.
Service Valve Connections a) Temporary connection: Screw in 3 – 5 turns by hand. (Fig. 60c) b) To fasten the flare nuts, apply specified torque as Table 9 and Fig. 60d. Torque wrench Table 9 Tube Dia. 1/4" (6.35 mm) Nut 21/32" (17 mm) Tightening Torque Fig. 60c Fig. 60d Approx. 120 – 160 lbs·in (140 – 180 kgf·cm) 3/8" (9.52 mm) 7/8" (22 mm) Approx. 300 – 360 lbs·in (340 – 420 kgf·cm) 1/2" (12.70 mm) 1-1/32" (26 mm) Approx. 430 – 480 lbs·in (490 – 550 kgf·cm) 5/8" (15.
8. Address Switch Tab 8-1. Address Setting of the Remote Controller The address can be set in order to prevent interference between remote controllers when 2 indoor units are installed near each other. The address is normally set to “A.” To set a different address, it is necessary to change the address on the second remote controller. Fig. 62 NOTE Once changed, you cannot restore the original address setting of the air conditioner. (1) Switch on the power source.
DC1111-0
