TECHNICAL & SERVICE MANUAL INDOOR UNIT : CS-MKS7NKU CS-MKS9NKU CS-MKS12NKU CS-MKS18NKU CS-MKS24NKU DC INVERTER MULTI-SYSTEM AIR CONDITIONER Capacity Indoor 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 MULTI-OUTDOOR UNITS .................................................................................... 5 1. OPERATING RANGE ..............................................................................
APPLICABLE MULTI-OUTDOOR UNITS Multi-Outdoor Unit Indoor Unit 3-Room 4-Room 4-Room CU-3KS19NBU CU-4KS24NBU CU-4KS31NBU CS-MKS7NKU YES YES YES CS-MKS9NKU YES YES YES CS-MKS12NKU YES YES YES CS-MKS18NKU YES YES YES CS-MKS24NKU NO YES YES 5
1. OPERATING RANGE Combination with cooling outdoor unit CU-3KS19NBU, CU-4KS24NBU or CU-4KS31NBU Temperature Cooling Indoor Air Intake Temp. Outdoor Air Intake Temp.
2. SPECIFICATIONS 2-1. Unit Specifications Indoor Unit CS-MKS7NKU < 230V > Type Wall Mounted Type Indoor Unit Voltage Rating 230V Single-Phase 60Hz Performance Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) BTU/h kW 3 3 ft /min (m /h) Pints/h Electrical Rating Available Voltage Range Running Amperes Power Input V A W Features Control / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Cooling 7,500 2.20 241 (410) / 224 (381) / 212 (360) 2.
Indoor Unit CS-MKS7NKU < 208V > Type Wall Mounted Type Indoor Unit 208V Single-Phase 60Hz Voltage Rating Performance Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) BTU/h kW 3 3 ft /min (m /h) Pints/h Electrical Rating Available Voltage Range Running Amperes Power Input V A W Features Control / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Cooling 7,500 2.20 241 (410) / 224 (381) / 212 (360) 2.77 Cooling 187 to 253 0.12 25 Microprocessor / I.C.
Indoor Unit CS-MKS9NKU < 230V > Type Wall Mounted Type Indoor Unit Voltage Rating 230V Single-Phase 60Hz Performance Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) BTU/h kW 3 3 ft /min (m /h) Pints/h Electrical Rating Available Voltage Range Running Amperes Power Input V A W Features Control / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Cooling 9,000 2.65 259 (440) / 241 (410) / 212 (360) 3.4 Cooling 187 to 253 0.15 35 Microprocessor / I.C.
Indoor Unit CS-MKS9NKU < 208V > Type Wall Mounted Type Indoor Unit 208V Single-Phase 60Hz Voltage Rating Performance Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) BTU/h kW 3 3 ft /min (m /h) Pints/h Electrical Rating Available Voltage Range Running Amperes Power Input V A W Features Control / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Cooling 9,000 2.65 259 (440) / 241 (410) / 212 (360) 3.4 Cooling 187 to 253 0.17 35 Microprocessor / I.C.
Indoor Unit CS-MKS12NKU < 230V > Type Wall Mounted Type Indoor Unit 230V Single-Phase 60Hz Voltage Rating Performance Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) BTU/h kW 3 3 ft /min (m /h) Pints/h Electrical Rating Available Voltage Range Running Amperes Power Input V A W Features Control / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Cooling 11,900 3.50 282 (479) / 259 (440) / 218 (370) 4.26 Cooling 187 to 253 0.15 35 Microprocessor / I.C.
Indoor Unit CS-MKS12NKU < 208V > Type Wall Mounted Type Indoor Unit 208V Single-Phase 60Hz Voltage Rating Performance Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) BTU/h kW 3 3 ft /min (m /h) Pints/h Electrical Rating Available Voltage Range Running Amperes Power Input V A W Features Control / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Cooling 11,900 3.50 282 (479) / 259 (440) / 218 (370) 4.26 Cooling 187 to 253 0.17 35 Microprocessor / I.C.
Indoor Unit CS-MKS18NKU < 230V > Type Wall Mounted Type Indoor Unit Voltage Rating 230V Single-Phase 60Hz Performance Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) BTU/h kW 3 3 ft /min (m /h) Pints/h Electrical Rating Available Voltage Range Running Amperes Power Input V A W Features Control / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Cooling 17,500 5.15 500 (850) / 447 (760) / 377 (641) 4.89 Cooling 187 to 253 0.15 35 Microprocessor / I.C.
Indoor Unit CS-MKS18NKU < 208V > Type Wall Mounted Type Indoor Unit 208V Single-Phase 60Hz Voltage Rating Performance Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) BTU/h kW 3 3 ft /min (m /h) Pints/h Electrical Rating Available Voltage Range Running Amperes Power Input V A W Features Control / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Cooling 17,500 5.15 500 (850) / 447 (760) / 377 (641) 4.89 Cooling 187 to 253 0.17 35 Microprocessor / I.C.
Indoor Unit CS-MKS24NKU < 230V > Type Wall Mounted Type Indoor Unit 230V Single-Phase 60Hz Voltage Rating Performance Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) BTU/h kW 3 3 ft /min (m /h) Pints/h Electrical Rating Available Voltage Range Running Amperes Power Input V A W Features Control / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Cooling 24,200 7.10 541 (919) / 500 (850) / 435 (739) 4.89 Cooling 187 to 253 0.20 45 Microprocessor / I.C.
Indoor Unit CS-MKS24NKU < 208V > Type Wall Mounted Type Indoor Unit 208V Single-Phase 60Hz Voltage Rating Performance Capacity Air Circulation (Hi/Me/Lo) Moisture Removal (High) BTU/h kW 3 3 ft /min (m /h) Pints/h Electrical Rating Available Voltage Range Running Amperes Power Input V A W Features Control / Temperature Control Control Unit Timer Fan Speeds Airflow Direction (Indoor) Cooling 24,200 7.10 541 (919) / 500 (850) / 435 (739) 4.89 Cooling 187 to 253 0.22 45 Microprocessor / I.C.
2-2. Major Component Specifications 2-2-1. Indoor Unit Indoor Unit CS-MKS7NKU Control PCB CB-CU-MKS7NKU Microprocessor 250V 3A Part No. Controls Control Circuit Fuse Fan Type Q'ty ... Dia. and Length Cross-Flow 1 ... D3-5/8 / L24-31/32 (D92 / L634) 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 DC Motor SIC-41CVJ-D847-4 ...
Indoor Unit CS-MKS9NKU Control PCB CB-CU-MKS9NKU Microprocessor 250V 3A Part No. Controls Control Circuit Fuse Fan Type Q'ty ... Dia. and Length Cross-Flow 1 ... D3-5/8 / L24-31/32 (D92 / L634) 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 DC Motor SIC-41CVJ-D847-4 ...
Indoor Unit CS-MKS12NKU Control PCB Part No. Controls Control Circuit Fuse CB-CU-MKS12NKU Microprocessor 250V 3A Fan Type Q'ty ... Dia. and Length Cross-Flow 1 ... D3-5/8 / L24-31/32 (D92 / L634) 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 DC Motor SIC-41CVJ-D847-4 ...
Indoor Unit CS-MKS18NKU Control PCB CB-CU-MKS18NKU 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 DC Motor SIC-41CVJ-D847-3 ...
Indoor Unit CS-MKS24NKU Control PCB CB-CU-MKS24NKU 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 DC Motor SIC-41CVJ-D847-3 ...
2-3. Other Component Specifications Model No. of sensor Sensor Name PTM-D51HS3 TH2 PTM-D51HS3-2 TH2 Indoor air temp sensor Quantity of Sensor CS-MKS7NKU CS-MKS9NKU CS-MKS12NKU CS-MKS18NKU CS-MKS24NKU 1 1 1 0 0 0 0 0 1 1 10 Resistance (k ohm) 9 8 7 6 5 4 3 2 1 0 50 59 68 77 86 95 104 (10) (15) (20) (25) (30) (35) (40) Temperature °F (°C) Model No.
3.
CS-MKS18NKU CS-MKS24NKU CS-MKS18NKU CS-MKS24NKU Indoor Unit Unit: inch(mm) (852-0-0010-216-00-0) 24
4. REFRIGERANT FLOW DIAGRAM 4-1. Refrigerant Flow Diagram Indoor Unit CS-MKS7NKU CS-MKS9NKU CS-MKS12NKU Indoor unit O.D. 3/8" (9.52 mm) Indoor heat exchanger O.D. 1/4" (6.35 mm) Indoor Unit Cooling cycle CS-MKS18NKU Indoor unit O.D. 1/2" (12.7 mm) Indoor heat exchanger O.D. 1/4" (6.35 mm) Indoor Unit Cooling cycle CS-MKS24NKU Indoor unit O.D. 5/8" (15.88 mm) Indoor heat exchanger O.D. 1/4" (6.
5. PERFORMANCE DATA 5-1. Air Throw Distance Charts Indoor Unit Cooling CS-MKS7NKU 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-MKS9NKU 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-MKS12NKU 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-MKS18NKU Room air temp. : Fan speed : 0 5 80°F (26.7°C) High Horizontal distance (ft.) 10 15 20 Axis air velocity (ft./sec.) Vertical distance (ft.
Indoor Unit Cooling CS-MKS24NKU 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.
7. FUNCTIONS 7-1. 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.
7-2. Protective Functions Freeze prevention 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. Freeze-prevention operation is engaged when the temperature of the indoor heat exchanger is below 43°F(6°C). 2. Restart after freeze-prevention operation occurs when the temperature of the indoor heat exchanger reaches 46°F(8°C) or above.
8. TROUBLESHOOTING (BEFORE CALLING FOR SERVICE) 8-1. 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.
8-3. 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) How to Identify a Serial Communication Error If the lamps on the main body show the following conditions after the completion of self-diagnosis, 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. NOTE Refer to "Method of Self-Diagnosis" for the self-diagnosis procedure.
(3-2) Condition: E12 1. Disconnect the inter-unit wiring on the indoor unit side. 2. Operate the system in TEST RUN mode. Then, five minutes later, perform the self-diagnosis. Condition: E01 What is the self-diagnosis result ? Condition: E12 1. Disconnect the inter-unit wiring on the outdoor unit side. 2. Operate the system in TEST RUN mode. Then, five minutes later, perform the self-diagnosis. An error in the P. C. Board in the indoor unit might be considered. (Terminal board error, etc.
8-4. Trouble Diagnosis of Fan Motor 8-4-1. 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.
8-5. 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.
APPENDIX A Operating Instructions CS-MKS7NKU CS-MKS9NKU CS-MKS12NKU (852-6-4181-214-00-2) A-1
Operating Instructions Split System Air Conditioner Model No. Indoor Units Outdoor Units CS-MKS7NKU CS-MKS9NKU CS-MKS12NKU CU-3KS19NBU CU-4KS24NBU CU-4KS31NBU 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 This switches the temperature display between °C and °F. Time Display Selector button This switches the time display between 24-hour time and 12-hour time. ACL button (ALL CLEAR) ADDRESS switch 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. 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 Indoor Unit CS-MKS9NKU CS-MKS12NKU Power Source Single-phase, 208-230 V, 60 Hz 2.20 2.65 3.50 kW Cooling Capacity 7,500 9,000 11,900 BTU/h kW Heating Capacity BTU/h 33/30/27 34/31/28 36/33/29 Operation Cooling Operation (H/M/L) dB(A) Sound Heating Operation (H/M/L) dB(A) Unit Dimensions (H×W×D) 11-7/32×32-15/32×7-7/16 11-7/32×32-15/32×7-7/16 11-7/32×32-15/32×7-7/16 inch(mm) (Indoor unit : Include panel) (285×825×189) (285×825×189) (285×825×189) lbs.(kg) Net Weight 19.8(9.0) 19.8(9.0) 19.8(9.
APPENDIX B Operating Instructions CS-MKS18NKU CS-MKS24NKU (852-6-4181-215-00-1) A-2
Operating Instructions Split System Air Conditioner Model No. Indoor Units Outdoor Units CS-MKS18NKU CS-MKS24NKU CU-3KS19NBU CU-4KS24NBU CU-4KS31NBU 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 This switches the temperature display between °C and °F. Time Display Selector button This switches the time display between 24-hour time and 12-hour time. ACL button (ALL CLEAR) ADDRESS switch 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. 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 dB(A) dB(A) Operation Cooling Operation (H/M/L) Sound Heating Operation (H/M/L) Unit Dimensions (H×W×D) inch(mm) (Indoor unit : Include panel) lbs.(kg) Net Weight Model No. Power Source Cooling Capacity Heating Capacity Operation Cooling Operation (Hi) Sound Heating Operation (Hi) Unit Dimensions (H×W×D) Net Weight Indoor Unit CS-MKS18NKU CS-MKS24NKU Single-phase, 208-230 V, 60 Hz 5.15 7.
APPENDIX C INSTALLATION INSTRUCTIONS CS-MKS7NKU CS-MKS9NKU CS-MKS12NKU CS-MKS18NKU CS-MKS24NKU (852-6-4190-580-00-0) A-3
For Indoor Unit INSTALLATION INSTRUCTIONS Split System Air Conditioner Contents This air conditioner uses the refrigerant R410A. NOTE 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.
$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. &OHDQ XS WKH VLWH DIWHU \RX ILQLVK UHPHPEHULQJ WR FKHFN that no metal scraps or bits of wiring have been left inside the unit being serviced.
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. 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. Indoor unit 2. Installation Site Selection 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.
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.
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 or 6 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. CS-MKS7NKU CS-MKS9NKU CS-MKS12NKU CS-MKS18NKU CS-MKS24NKU 2-9/16" (65 mm) 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.
Grille Air intake grille 3-4. Removing and Installing the Grille 3-4-1. Indoor unit types (CS-MKS7NKU, CS-MKS9NKU, CS-MKS12NKU) 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. CAUTION Fig. 16a Be sure to wear work gloves during installation to avoid being cut by the sharp aluminum fins of the heat exchanger.
3-4-2. Indoor unit types (CS-MKS18NKU, CS-MKS24NKU) Grille Air intake grille 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-1) Fig. 16a-1 (2) Remove the 3 screws. (Fig. 16b-1) (3) Remove the screw on the right side cover plate and open the cover.
3-5. Shape the Indoor Side Tubing (1) Arrangement of tubing by directions 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. 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. 9/32" (7 mm) (ACTUAL SIZE) STRIP SIZE How to connect wiring to the terminal a) For Indoor Unit Fig.
3-8. 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 /HDG WKH WXELQJ DQG GUDLQ KRVH WKURXJK WKH ZDOO 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. Fig. 38 Switching drain hose and drain cap D Wide tube Narrow tube /RFDWH WKH GUDLQ KRVH DQG WKH GUDLQ FDS )LJ 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) 3-9. 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 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. E 7KHQ SUHVV DQG KROG WKH $&/ 5HVHW EXWWRQ ZLWK D pointed object such as the tip of a pen. After 5 secRQGV UHOHDVH WKH $&/ EXWWRQ ILUVW ON/OFF operation button QUIET button c) Then release the QUIET and 1HR.
5. Remote Controller Installation Position The remote controller can be operated from either a non-fixed position or a wall-mounted position.
6. Address Switch Tab 6-1. 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.
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 inserted into the terminal block. Inter-unit cables are securely fixed.
DC1111-0
