AIR CONDITIONER OUTDOOR UNIT INDOOR UNIT. 1. Precautions

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1 MULTI AIR CONDITIONER INDOOR UNIT AJ007/009/012/018/024JNADCH AJ009/012/018JNNDCH AJ009/012/018JNLDCH OUTDOOR UNIT AJ020MCS3CH AJ024MCS4CH AJ030MCS4CH AIR CONDITIONER CONTENTS 1. Precautions 3. Disassembly and Reassembly 4. Troubleshooting 5. PCB Diagram and Parts List 6. Wiring Diagram 7. Schematic Diagram 8. Reference Sheet

2 Contents 11. Precautions Installing the air conditioner Power supply and circuit breaker During operation Disposing of the unit Others Product Spe The Feature of Product Product S cations The Comparative of Product Accessory and Option Speci cations Disassembly and Reassembly Outdoor Unit Trouble shooting Display Error and Check Method Setting and indoor unit address and installation option Setting Option Setup Method 4-4 Items to be checked first Setting to Cool or Heat only mode, checking and Cool/Heat modes operation test Fault Diagnosis by Symptom PCB Inspection PCB Diagram and Parts list Indoor Unit Outdoor Unit Wiring Diagram Indoor Unit Outdoor Unit Schematic Diagram Indoor Unit Outdoor Unit Reference Sheet Selecting Area for Installation Connecting Up and Purging the Circuit Refrigerant Adjustment Flare Nut Fixing Torque Pump down Procedure Index of Model Name Refrigerant Cycle Diagram Pressure & Capacity mark The abbreviated technology word Q&A for Non-trouble Common sense of refrigeration 8-20

3 1. Precautions 1-1 Installing the air conditioner Users should not install the air conditioner by themselves. Ask the dealer or authorized company to install the air conditioner except the window-type air conditioner in U.S.A and Canada. If you don t install the air conditioner properly, it may cause a fire, a water leakage or an electric shock. You must install the air conditioner according to the national wiring regulations and safety regulations. Install the indoor unit higher than 8.2 ft from the floor to avoid the injury caused by the operation of the fan. (except the window-type air conditioner) The manufacturer is not responsible for any accidents or injury caused by an incorrect installation. When installing the built-in type air conditioner, keep all electric cables such as the power cable and the connection cord in pipes, ducts, or cable channels to protect them from the danger of impact or any other incidents. More than 2 indoor units should be installed when you use Free Joint Multi air conditioner. AJ020MCS3CH - **018/024** indoor units cannot be connected. AJ024MCS4CH - AJ024JNADCH indoor units cannot be connected. Avoid Dangerous Contact e gs nu ao d r 1-2 Power supply and circuit breaker If the power cord of the air conditioner is damaged, it must be replaced by the manufacturer or a qualified person in order to avoid a hazard. The air conditioner must be plugged into an independent circuit if applicable or connect the power cable to the auxiliary circuit breaker. An all pole disconnection from the power supply must be incorporated in the fixed wiring with a contact opening of > 0.12 inch. Do not extend an electric cord to the air conditioner. The air conditioner must be plugged in after you complete the installation. No Tapping and No Extension Cords Samsung Electronics 1-1

4 1-3 During operation Do not repair the air conditioner at your discretion. It is recommended to contact a service center directly. Never spill any kind of liquid on the air conditioner. If this happens, turn off the air conditioner and contact an authorized service center. Do not insert anything between the airflow blades to prevent damage of the inner fan and consequent injury. Keep children away from the air conditioner. Do not place any obstacles in front of the air conditioner. Do not spray any kind of liquid into the indoor unit. If this happens, turn off the air conditioner and contact a service center. Make sure that the air conditioner is well ventilated at all times: Do not place a cloth or other materials over it. Remove the batteries if you don t use the remote control for a long time. (If applicable) Use the remote control within 7 meters from the indoor unit. (If applicable) No children Nearby 1-4 Disposing of the unit Before throwing out the air conditioner, remove the batteries from the remote control. When you dispose of the air conditioner, consult your dealer. If pipes are removed incorrectly, refrigerant may blow out and cause air pollution. When it contacts with your skin, it can cause skin injury. The package of the air conditioner should be recycled or disposed of properly for environmental reasons. 1-5 Others Never store or load the air conditioner upside down or sideways to prevent the damage to the compressor. Young children or infirm persons should be always supervised when they use the air conditioner. Max current is measured according to IEC standard for safety. Current is measured according to ISO standard for energy efficiency. When installing, make sure there is no leakage. When recovering the refrigerant, ground the compressor first before removingthe connection pipe. If the refrigerant pipe is not properly connected and the compressor works with the service valve open, the pipe inhales the air and it makes the pressure inside of the refrigerant cycle abnormally high. It may cause explosion and injury. Pump Down Procedure (When removing the product) - Turn on the air conditioner and select Cool mode to run the compressor for 3 minutes. - Release the valve caps on High and Low pressure side. - Use L wrench to close the valve on the high pressure side. - Approximately 2 minutes after, close the valve on the low pressure side. - Stop operation of the air conditioner.- Disconnect the pipes. 1-2 Samsung Electronics

5 2. Product Specifications 2-1 The Feature of Product Samsung Electronics 2-1

6 2-2 Product Spe ations 2-2 Samsung Electronics

7 2-2 Product Spe ations Samsung Electronics 2-3

8 Product ations(cont.) 2-4 Samsung Electronics

9 Product ations(cont.) 2-12 Samsung Electronics

10 The Comparative Spe ations of Product(cont.) 2-20 Samsung Electronics

11 The Comparative Spe ations of Product(cont.) Samsung Electronics 2-21

12 2-4 Accessory and Option Spe ons Indoor Unit Accessories 2-22 Samsung Electronics

13 Accessories(cont.) Item Description Code No. Q ty Remark Ass'y drain hose DB A 1 Cable-tie DB C 6 Seal-drain ass'y DB A 1 Essential O er (Indoor Unit) Seal-drain ass'y DB H 1 Seal-drain ass'y DB J 1 ASSY INSTALL MANUAL/USER MANUAL DB A DB A 1/1 BOLT Essential O er (Panel) ASSY-INSTALLATION MANUAL DB A 1 Filter accessory Item Descriptions Code-No. Remark Dust filter DB A Basic/ Water wash Samsung Electronics 2-27

14 Accessories(cont.) Samsung Electronics 2-29

15 Accessories(cont.) Outdoor Unit Accessories Drain-Plug Out DB A Label Energy DB A (AJ020MCS3CH) DB B (AJ024MCS4CH) DB C (AJ030MCS4CH) Rubber-Leg DB A ASSY TUBE DB A DB B DB A Samsung Electronics 2-31

16 Accessories(cont.) 2-32 Samsung Electronics

17 3. Disassembly and Reassembly Necessary Tools Item Remark MONKEY SPANNER Samsung Electronics 3-1

18 AJ***MCS*CH (Follow pictures is shape of AJ020MCS3CH) Samsung Electronics 3-13

19 3-14 Samsung Electronics

20 Samsung Electronics 3-15

21 1) Unscrew and remove the Fan cover. 2) 3-16 Samsung Electronics

22 23 Samsung Electronics 3-17

23 3-18 Samsung Electronics

24 Samsung Electronics 3-19

25 16 Base Heater 1) Unscrew and remove 4 screws on the heater holder, and remove the heater holder and the base heater Samsung Electronics

26 4. Troubleshooting 4-1 Display Error and Check Method Indoor unit Samsung Electronics 4-1

27 Abnormal conditions LED lamp display Operation Defrost Timer Filter Remarks Power reset X X X Error of temperature sensor in the indoor unit (Open/Short) X X X value to see if it s short/open. Error of heat exchanger sensor in the indoor unit (Open/Short) X X if it s short/open. Error of fan motor in the indoor unit X X X Error of the outdoor temperature sensor Error of the condensor temperature sensor Error of the discharge temperature sensor No communication for 2 minutes between indoor and outdoor unit (communication error for more than 2minutes) Error of outdoor unit X X X X X value to see if it s short/open. heat exchangers communication cables er. - Detection of the float switch EEPROM error X X X water. nent. - EEPROM option error - door machine models Motion detect sensor error X X -.Check the wire connection -. Check the MDS-KIT -.Check the indoor PBA Mixed operation error X X X 4-4 Samsung Electronics

28 4-8 Samsung Electronics

29 4-1-2 Outdoor Unit - LED ON / LED OFF / LED BLINK - Error Code is for reference(s-net), not display on the HUB PCB of Outdoor unit. Display Red Green Yellow Error Code Explanation Remark E190 Pipe inspection error E199 Error of non-performed installation-test-operation E201 E202 The number of indoor unit mismatched Communication errer between the outdoor and indoor unit E203 Outdoor communication error between main micom and inverter micom E206 Outdoor communication error beween main micom and hub micom E221 Outside temperature sensor error (Short/Open) E237 Condenser temperature sensor error (Short/Open) E251 Compressor Discharge temperature sensor error (Short/Open) E320 Compressor OLP sensor error (Short/Open) E330 EvaIn1 Sensor error (Short/Open) E331 EvaIn2 Sensor error (Short/Open) E332 EvaIn3 Sensor error (Short/Open) E333 EvaIn4 Sensor error (Short/Open) E334 EvaIn5 Sensor error (Short/Open) E335 EvaOut1 Sensor error (Short/Open) E336 EvaOut2 Sensor error (Short/Open) E337 EvaOut3 Sensor error (Short/Open) E338 EvaOut4 Sensor error (Short/Open) E339 EvaOut5 Sensor error (Short/Open) E401 Outdoor unit freezing - Safety control (Compressor stop) check pipe lenght, indoor unit filter, refrigerant leakage/charge and service port E 404 Outdoor unit overload - Safety control (Compressor stop) check pipe lenght, refrigerantleakage/charge E440 High temperature(over 30 C) or low temperature(under -10) of outdoor as heating mode E441 Low temperature(under -10 C) of outdoor as cooling mode E416 Outdoor unit high discharge temperature - Safety control (Compressor stop) check pipe lenght, refrigerantleakage/charge E458 Outdoor Fan Error E461 Inverter compressor starting failure (5 times) E462 Compressor trip by input current control mode (PFC over current) E463 Compressor trip by OLP temperature control mode E464 DC Peak system error (Over current) E465 Compressor Vlimit Error E466 E483 Inverter DC link Voltage error (under 150V, over 410V) H/W Detect DC Link over voltage Error E467 Abnormal compressor running (Compressor Rotation Error) E468 Current sensor error (Short/Open) E469 E488 E470 E471 E474 E485 DC-Link valtage sensor error (Short/Open) Error of the input current sensor Outdoor unit EEPROM Error Inverter micom option read/write error Inverter IPM Heat Sink sensor error (Short/Open) Inverter input current sensor error (Short/Open) E484 PFC Overload error (Over current) E500 Inverter IPM over heat error E554 The refrigerant leaks completely from the outdoor unit. Samsung Electronics 4-9

30 1 the red LED of the B part turns on, the greed LED of the A part blinks, K1 K3 Dip Switch If fails, the red LED of the A part turns on. - This work takes approximately 3 to 5 minutes. A B LED (RED, GRN / RED, GRN, YEL) 1) Te switch 1 of the DIP switch, and then turn on the outdoor unit. K1 K2 Reset 4-10 Samsung Electronics

31 4-3 Setting Option Setup Method ex)option No. : Step 1 : Enter the Option Setup mode. 1 st Take out the batteries of remote control. 2 nd Press the temperature button simultaneously and insert the battery again. 3 rd Make sure the remocon display shown as. Step 2 : Enter the Option Setup mode and select your option according to the following procedure. 1 The default value is. Otherwise, push the button to. Every time you push the button, the display panel reads repeatedly. or Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. 4 Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Setting is not required if you must a value which has a default. 5 6 Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Samsung Electronics 4-11

32 17 Press button, then the default value is Setting is not required if you must a value which has a default Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Step 3 : Upon completion of the selection, check you made right selections. Press the Mode Selection key, to set the display part to and check the display part. The display part shows. Press the Mode Selection key, to set the display part to and check the display part. The display part shows. Step 4 : Pressing the ON/OFF button( ) When pressing the operation ON/OFF key with the direction of remote control for unit, the sound Ding or Diriring is heard and the OPERATION ICON( ) lamp of the display is flickering at the same time, then the input of option is completed. (If the diriring sound isn t heard, try again pressing the ON/OFF button.) Step 5 : Unit operation test-run First, Remove the battery from the remote control. Second, Re-insert the battery into the remote control. Third, Press ON/OFF button( ) with the direction of remote control for set. 1 st If all lamps of indoor unit are flickering, Plug out, plug in power plug again and press ON/OFF key to retry. 2 nd If the unit is not working properly or all lamps are continuously flickering after setting the option code, see if the correct option code is set up for its model Samsung Electronics

33 ex) Option No. : Step 1 : Enter the Option Setup mode. 1 st Take out the batteries of remote control. 2 nd Press the temperature button simultaneously and insert the battery again. 3 rd Make sure the remocon display shown as. Step 2 : Enter the Option Setup mode and select your option according to the following procedure. 1 The default value is. Otherwise, push the button to. Every time you push the button, the display panel reads repeatedly. or 2 Push the button to set the display panel to. 3 2 Every time you push the button, the display panel reads... repeatedly Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. 5 Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Setting is not required if you must a value which has a default. 6 Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Samsung Electronics 4-13

34 7 Press button, then the default value is. 8 Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly Push the button to set the display panel to Every time you push the button, the display panel reads... repeatedly Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. 11 Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Setting is not required if you must a value which has a default. 12 Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Step 3 : Upon completion of the selection, check you made right selections. Press the Mode Selection key, to set the display part to and check the display part. The display part shows. Press the Mode Selection key, to set the display part to and check the display part. The display part shows. Step 4 : Pressing the ON/OFF button ( ) When pressing the operation ON/OFF key with the direction of remote control for unit, the sound ''Ding'' or ''Diriring'' is heard and the OPERATION ICON( ) lamp of the display is flickering at the same time, then the input of option is completed. (If the diriring sound isn't heard, try again pressing the ON/OFF button.) Step 5 : Unit operation test-run First, Remove the battery from the remote control. Second, Re-insert the battery into the remote control. Third, Press ON/OFF key with the direction of remote control for set. Error Mode 1 st If all lamps of indoor unit are flickering, plug out, plug in power plug again and press the ON/OFF key to retry. 2 nd If the unit is not working properly or all lamps are continuously flickering after setting the option code, see if the correct option code is set up for its model Samsung Electronics

35 ex) Option No. : Step 1 : Enter the Option Setup mode. 1 st Take out the batteries of remote control. 2 nd Press the temperature button simultaneously and insert the battery again. 3 rd Make sure the remote contr display shown as. Step 2 : Enter the Option Setup mode and select your option according to the following procedure. Feature Display 1 The default value is Auto. Auto Auto Every time you push the button, the display panel reads Auto Cool Dry Fan Heat, OFF Auto Cool Dry Fan Heat repeatedly. 2 Push the button to set the display panel to. Auto Every time you push the button, the display panel reads... repeatedly Push the button to set the display panel to. Every time you push the button, the display panel reads repeatedly. Push the button to Cool. Auto Push the button to set the display panel to. Cool Every time you push the button, the display panel reads... repeatedly. Comfort Care Temp Humi 5 Push the button to set the display panel to. Cool Every time you push the button, the display panel reads... repeatedly. 6 Push the button to Dry. Push the button to set the display panel to. Dry Every time you push the button, the display panel reads... repeatedly. Samsung Electronics 4-15

36 Feature Display 7 Push the button to set the display panel to. Dry Fan Every time you push the button, the display panel reads... repeatedly. 8 Push the button to Fan. Push the button to set the display panel to. Fan Every time you push the button, the display panel reads repeatedly. Push the button to set the display panel to. Every time you push the button, the display panel reads Fan... repeatedly. 10 Push the button to Heat. Push the button to set the display panel to. Heat Comfort Care Temp Humi Every time you push the button, the display panel reads... repeatedly. 11 Push the button to set the display panel to. Every time you push the button, the display panel reads... repeatedly. Heat Step 3 : Upon completion of the selection, check you made right selections. Press the Mode Selection key to set the display part and check the display part. The display part shows like below when each time you press Mode button. Auto Cool Dry Fan Heat Step 4 : Pressing the ON/OFFbutton ( ) When pressing the operation ON/OFF key with the direction of remote control for unit, the sound íídingíí or íídiriringíí is heard and the OPERATION ICON ( ) lamp of the display is flickering at the same time, then the input of option is completed. (If the diriring sound isnít heard, try again pressing the ON/OFF button.) Step 5 : Unit operation test-run First, Remove the battery from the remote control. Second, Re-insert the battery into the remote control. Third, Press ON/OFF key with the direction of remote control for set. Error Mode 1 st If all lamps of indoor unit are flickering, Plug out, plug in power plug again and press ON/OFF key to retry. 2 nd If the unit is not working properly or all lamps are continuously flickering after setting the option code, see if the correct option code is set up for its model Samsung Electronics

37 Samsung Electronics 4-17

38 4-18 Samsung Electronics

39 4-3-1 Setting an indoor unit address and installation option Set the indoor unit address and installation option with remote controller option. Set the each option separately since you cannot set the ADDRESS setting and indoor unit installation setting option at the same time.you need to set twice when setting indoor unit address and installation option. Please use the proper wireless remocon which can set 24 digit option code. Following is the instructions of setting option code with wireless remocon of MR-DH00. (MR-AH01 can be used for operating but cannot be used for setting the installation option because only 12 digit option setting is available. Please refer to the wired remocon installation manual for setting with the wired remocon The procedure of setting option Entering mode for setting option Option setting mode Mode change High Temp Button Low Temp Button High Fan Button Low Fan Button Step 1. Entering mode to set option 1. Remove batteries from the remote controller. 2. Insert batteries and enter the option setting mode while pressing High Temp button and Low Temp button. 3. Check if you have entered the option setting status. Step 2. The procedure of option setting After entering the option setting status, select the option as listed below. were used at the previous other remocons. 0 X X X X X 1 X X X X X 2 X X X X X 3 X X X X X Samsung Electronics 4-19

40 The procedure of setting option Option setting Status Press Low Fan button( Press High Fan button( Each time you press the button, will be selected in rotation. 2. Setting Cool mode Press Mode button to be changed to Cool mode in the ON status. Press Low Fan button( Press High Fan button( Each time you press the button, will be selected in rotation. 4. Setting Dry mode Press Mode button to be changed to DRY mode in the ON status. Press Low Fan button( Press High Fan button( Each time you press the button, will be selected in rotation. 6. Setting Fan mode Press Mode button to be changed to FAN mode in the ON status. Press Low Fan button( Press High Fan button( Each time you press the button, will be selected in rotation. 8. Setting Heat mode Press Mode button to be changed to HEAT mode in the ON status. Press Low Fan button( Press High Fan button( Each time you press the button, will be selected in rotation. 10. Setting Auto mode Press Mode button to be changed to AUTO mode in the OFF status. Press Low Fan button( Press High Fan button( Each time you press the button, will be selected in rotation Samsung Electronics

41 The procedure of setting option (cont.) 12. Setting Cool mode Option setting Press Mode button to be change to Cool mode in the OFF status. Status Press Low Fan button( Press High Fan button( Each time you press the button, will be selected in rotation. 14. Setting Dry mode Press Mode button to be change to Dry mode in the OFF status. Press Low Fan button( Press High Fan button( Each time you press the button, will be selected in rotation. 16. Setting Fan mode Press Mode button to be change to Fan mode in the OFF status. Press Low Fan button( Press High Fan button( Each time you press the button, will be selected in rotation. 18. Setting Heat mode Press Mode button to be change to HEAT mode in the OFF status. Press Low Fan button( Press High Fan button( Each time you press the button, will be selected in rotation. Step 3. Check the option you have set After setting option, press button to check whether the option code you input is correct or not. Option Remote Controller Display Option Remote Controller Display Step 4. Input option Press operation button with the direction of remote control for set. For the correct option setting, you must input the option twice. Step 5. Check operation 1. Reset the indoor unit by pressing the RESET button of indoor unit or outdoor unit. 2. Take the batteries out of the remote controller and insert them again and then press the operation button. Samsung Electronics 4-21

42 Setting an indoor unit address (MAIN/RMC) 1. Check whether power is supplied or not. - When the indoor unit is not plugged in, there should be additional power supply in the indoor unit. 2. The panel(display ) should be connected to an indoor unit to receive option. 3. Before installing the indoor unit, assign an address to the indoor unit according to the air conditioning system plan. 4. Assign an indoor unit address by wireless remote controller. -The initial indoor unit ADDRESS is set as "MAIN : 0, RMC : 0". -Set Main and RMC Address only the setting is required. -There is no need to assign the indoor unit Main Address if the outdoor unit is addressing automatically. The indoor unit Main address will follow the outdoor unit's automatically. -Assign 12 digit when setting the indoor unit address. -If you set the applicable segments with numbers other than the indiciated, the initial setting will be maintained. Option No. : 0AXXXX-1XXXXX-2XXXXX-3XXXXX Option Explanation MODE Setting Main address The unit digit of an indoor unit Indication and Details Indication Details Indication Details Indication Details Indication Details 0 A 0 1 No Main address Main address setting mode A single digit Option Explanation Setting RMC address channel(*16) Indication Details Indication Details Indication Details Indication Details Indication and Details 1 0 No RMC address 1 RMC address setting mode RMC1 RMC2 Example) If you want to set as "MAIN : 3, CHANNEL : 1, RMC : B", 0 A B assign option codes except SEG 1, 7 which are page options Samsung Electronics

43 Setting an indoor unit installation option (suitable for the condition of each installation location) 1. Check whether power is supplied or not. - When the indoor unit is not plugged in, there should be additional power supply in the indoor unit. 2. The panel(display ) should be connected to an indoor unit to receive option. 3. Set the installation option according to the installation condition of an air conditioner. - The default setting of an indoor unit installation option is Individual control of a remote controller(seg20) is the function that controls an indoor unit individually when there is more than one indoor unit. - No need to assign SEG3, 6, 9, 10, 11, 16, 21, 22, 23, 24 which are non applicable. Even though those segments are set, they will be ignored. - If you set the applicable segments with numbers other than the indiciated, the initial setting will be maintained. 4. Set the indoor unit option by wireless remote controller. Option No. : 02XXXX-1XXXXX-2XXXXX-3XXXXX Option (Mini 4Way only) Explanation MODE Use of external temperature sensor Use of central control RPM setting compensation Indication and Details Option Indication Details Indication Details Indication Details Indication Details 0. Not used Disuse 0 Disuse 1 Use 1 Use 1. High ceiling mode 2. High ceiling kit 3. Low noise operation mode Explanation Use of drain pump Master / Slave Indication and Details Option Explanation Indication and Details Indication Details Indication Details Indication Details 0 Disuse 0 slave 1 Use 1 master 1 Use + 2 3minute delay Use of external control Setting the output of external control S-Plasma ion Buzzer control Number of hours Indication Details Indication Details Indication Details Indication Details Indication Details Indication Details 2 0 Disuse ON/OFF Control OFF Control WINDOR ON/OFF 1 Thermo on Operation on 0 Disuse 0 1 Use Mixed operation control 1/Use buzzer Mixed operation control 1/Disuse of buzzer Mixed operation control 2/Use buzzer Mixed operation control 2/Disuse of buzzer Hour Hour Samsung Electronics 4-23

44 Option Explanation Indication and Details Individual control of a remote controller (Mini 4 Way only) Motion detect sensor Indication Details Indication Details Indication Details 0 or 1 Indoor 1 0.No Use (Factory Setting) 2 Indoor 2 0 Disuse 1.Standard Mode/Auto 3 Indoor 3 Set OFF30 Min. 2.Standard Mode/Auto Set OFF60 Min. 3.Standard Mode/Auto Set OFF 120 Min. 4.Standard Mode/Auto 3 1 Set OFF 180 Min. 2 C 5.Premium Mode/ 4 Indoor 4 Auto Set OFF30 Min.6.Premium Mode/ Auto Set OFF60 Min. 2 5 C 7.Premium Mode/Auto Set OFF 120 Min. 8.Premium Mode/Auto Set OFF 180 Min. If you input a number other than 0~4 on the individual control of the indoor unit(seg 20), the indoor is set as "Indoor 1". Example) If you want to set as "Exterior temperature sensor : USE, External control : USE, Number of hours assign option codes except SEG 1, 7, 13, 19 which are page options Changing a particular option You can change each digit of set option. Option Explanation Indication and Details MODE The option mode you want to change The tens digit of an change The unit digit of will change The changed value Indication Details Indication Details Indication Details Indication Details Indication Details Indication Details 0 D Option mode Tens digit Unit digit The changed value Ex) When setting the 'buzzer control' into disuse status. Option Explanation MODE The option mode you want to change The tens digit of you will change The unit digit of you will change The changed value Indication 0 D Samsung Electronics

45 4-3-2 Changing a particular option Samsung Electronics 4-25

46 4-4 Items to be checked first 1. The input voltage should be rating voltage ±10% range. The air conditioner may not operate properly if the voltage is out of this range. 2. Is the link cable linking the indoor unit and the outdoor unit linked properly? The indoor unit and the outdoor unit shall be linked by 4 cables. Check the terminals if the indoor unit and outdoor unit are properly linked by the same number of cables. Otherwise the air conditioner may not operate properly. 3. When a problem occurs due to the contents illustrated in the table below it is a symptom not related to the malfunction of the air conditioner. Samsung Electronics 4-27

47 4-28 Samsung Electronics

48 Setting an indoor unit address (MAIN/RMC) 1. Check whether power is supplied or not. - When the indoor unit is not plugged in, there should be additional power supply in the indoor unit. 2. The panel(display ) should be connected to an indoor unit to receive option. 3. Before installing the indoor unit, assign an address to the indoor unit according to the air conditioning system plan. 4. Assign an indoor unit address by wireless remote controller. - The initial setting status of indoor unit ADDRESS(MAIN/RMC) is "0A " - There is no need to assign extra ADDRESS for 1:1 installation between indoor unit and outdoor unit. Option No. : 0AXXXX-1XXXXX-2XXXXX-3XXXXX (AJ***JNADCH) 1(L) 2(N) Indoor Unit F2 F1 Option Explanation MODE Setting Main address 100-digit of indoor unit address 10-digit of indoor unit A single digit of indoor unit Remote Controller Display Indication Details Indication Details Indication Details Indication Details Indication Details Indication Details Indication and Details Option Explanation 0 A 0 1 No Main address Main address setting mode Setting RMC address 100-digit 10-digit channel(*16) A single digit Remote Controller Display Indication Details Indication Details Indication Details Indication Details Indication Details Indication Details Indication and Details No RMC address RMC address setting mode You must set RMC address setting mode when using the centralized Control. RMC1 RMC Samsung Electronics

49 ON DIP Display error of Outdoor unit LED(RED/GRN/YEL) Samsung Electronics 4-31

50 4-32 Samsung Electronics

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52 4-34 Samsung Electronics

53 Set the indoor mode Switch 3 3 OFF OFF ON ON Only Cooling ON OFF OFF OFF Samsung Electronics 4-35

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55 Samsung Electronics 4-37

56 Communican error aer g Tracking 4-38 Samsung Electronics

57 EEPROM circuit failure EEPROM component failure, EEPROM circuit parts damaged/soldering (damaged/soldering failure) Samsung Electronics 4-39

58 4-6-2 Outdoor unit is not powered on Initial diagnosis(1phase) Turn off the main power switch 4-40 Samsung Electronics

59 Caution! When you remove PBA, you have to check DC link Voltage. After Power off, DC link Voltage is so high! R S R S R S Measuring point Normal value Resistance R - S over the hundreds Samsung Electronics 4-41

60 1 ON DIP Outdoor unit fan error HUB PCB of Outdoor unit Turn on the only this LED(Yellow). - E Samsung Electronics

61 1 ON DIP HUB PCB of Outdoor unit Turn on the this LED(Red/Yellow). - E467 AJ***MCS*CH U-V V-W W-U Samsung Electronics 4-43

62 1 ON DIP HUB PCB of Outdoor unit IPM Over current error Turn on the Green LED, and blink the Yellow LED. - E500 U-V V-W W-U AJ***MCS*CH Turn off the power and reconnect the table. Turn off the power and correct or replace the temperature sensor location 4-44 Samsung Electronics

63 ON DIP Checking Temperature sensor Outdoor discharge/olp temperature sensor error HUB PCB of Outdoor unit Turn on the Green LED and blink the Yellow LED (E251) Blink only the Yellow LED (E320) Samsung Electronics 4-45

64 1 ON DIP HUB PCB of Outdoor unit Outdoor out/evap temperature sensor error Blink the Red LED and the Green LED - E330~E334 Blink all LED(Red, Green, Yellow) - E335~E Samsung Electronics

65 11. When connected to an outdoor unit manufactured after June, 2011, a new option code is not needed. Samsung Electronics 4-47

66 5. PCB Diagram 5-1. INDOOR PCB Diagram CN21 CN81 CN61 CN63 CN62 CN43 CN76 CN32 CN91 CN77 CN31 CN72 CN51 CN75 CN71 CN61/CN62/CN63 - STEP MOTOR #1: DC 12V #2~#5 :STEP MOTOR SIGNAL CN71 - POWER IN #1,#3 : AC220~240V #2 : N.C CN81 - SPI #1: SPI SIGNAL #3 : DC 12V CN51 - WI-FI MODULE #1 : WIFI UART SIGNAL1 #2 : WIFI UART SIGNAL2 #3 : WIFI RESET SIGNAL #4 : GND #5 : DC 12V #6 : N.C CN51 - DISPLAY #1~#11,#14,#17~#20 : MICOM DOWN #12, #13, #15, #16 : N.C CN32 - FJM/NASA #1~#7, #11~ #14 : FJM/NASA SIGNAL #8 : DC 5V #9 : GND #10 : DC 12V CN31 - DOWNLOAD DOWNLOAD CN43 - TEMPERATURE SENSOR #1,#2 : ROOM SENSOR #3,#4 : EVA MID SENSOR #5,#6 : EVA IN SENSOR CN75 - SMPS POWER IN #1,#3 : AC220~240V #2 : N.C CN21 - COMMUNICATION #1,#2 : 485 COMM SIGNAL CN76 - SMPS DC OUT (12V/GND/5V) #1 : DC 5V #2 : GND #3 : DC 12V CN72 - BLDC FAN MOTOR #1 : DC 310~340V #2 : N.C #3 : AGND #4 : DC 15V #5 : FAN RPM #6 : FAN FEEDBACK CN77 - SMPS DC OUT (19V/GND/310V) #1 : DC 310V~340V #2,#3 : N.C #4 : DC 19V~27V #5 : AGND Samsung Electronics 5-1

67 AJ***JNNDCH Indoor Unit (1) Main power input (2) BLDC fan (3) Earth wire (4) Float switch 1(L):Phase L 1:DC310V 1:GND 1:Float_SW 2(N):Phase N 2:Not used 2:GND 3:AGND 4:DC15V 5:FAN PRM 6:PRM FEEDBACK (5) Eva in/out sensor (6) Room temperature (7) S/W download (8) Panel display 1:EVA IN temperture sensor 1:Room remperature sensor S/W download 1:DC12V 2,4,6:GND 2:GND 2-5:LED control signal 3:EVA OUT temperture sensor 6:REMOCON signal out 5:EVA discharge 7,8:Not used 9:REMOCON_INT 10:GND 11:Vcc ( 9) VENT (10) Panel flaps (11) SPI (12) Drain Pump 1:DC12V 1:DC12V 1,2:GND 1:DC12V 2:VENT_OUT 2-5: Louver control signal 3:SPI CONTROL 2:DRAOM_PUMP_OUT 6:DV12V 4:Not Used 7-10:Louver control signal (13) Human Sensor (14) External (15) External (16) COM1,COM2,V1,V2 1:DC12V 1, 3: DC12V 1:EXT_CTRL F3-F4: Com2 2:Com4_TXD 2:Error_CHK_OUT 2:GND V1-V2:DC12V 3:Com4_RXD 3:Comp_CHK_OUT F1-F2:Com1 4:Human sensor reset 5:GND 5-6 Samsung Electronics

68 Panel PCB 1 CN01-DISPLAY #6 : Remocon signal out #9 : Remocon signal IN Samsung Electronics 5-7

69 Float Switch Room Temperature 2 EVA in Temperature 3 EVA out Temperature 4 Heater Temperature 5 Wired Remote Controller Power(12V) 6 Control Signal 7 EEV 8 Display 9 Operating Check Signal 10 HALL IC 11 Download 12 COM 1 13 COM 2 14 Load Control Signal 15 Heater 16 Address Switch 17 Option Switch 18 Fan (Tap Control) 19 Ventilator 20 Drain Pump 21 Hot Coil 22 Fan (SSR) 23 Trans In 24 Main Power 25 Trans out Samsung Electronics 5-9

70 CN101 CN702 CN703 CN403 CN306 CN806 CN803 CN804 CN12 CN805 CN801 CN305 CN103 CN303 1 CN101 - POWER 2 CN702-4WAY 3 CN703 - HEATER 4 CN403 - SENSOR #1~#3 : 220~240 VAC #1~#3 : 220~240 VAC #1~#3 : 220~240 VAC #1~#2 : OUTDOOR TEMP #3~#4 : COND TEMP #5~#6 : DISCHARGE TEMP #7~#8 : OLP TEMP 5 CN306 - DOWNLOAD 6 CN803 - EEV C 7 CN804 - EEV B 8 CN805 - EEV A #1-#9 : DOWNLOAD SIGNAL #14 : DOWNLOAD SIGNAL #18-#20 : DOWNLOAD SIGNAL #10 : VCC #17 l GND #1 - #4 : SIGNAL #5 : 12V #1 - #4 : SIGNAL #5 : 12V #1 - #4 : SIGNAL #5 : 12V 9 CN801 - ERROR/COMP 10 CN305 - COMP INV 11 CN806 - EEPROM 12 CN412 - COMM POWER #1, #3 : 12V #1 - #2 : SIGNAL #1 : GND #2, #4 : SIGNAL #3 : GND #2 : NC #4 : VCC #3 : VCC #5 : 12V #4 - #7 : SIGNAL #6 : SIGNAL - 13 CN COMM 14 CN103 - EARTH OWNLOAD #1 : SIGNAL #2 : SIGNAL #1 : EARTH #1 : 12V #3 : GND 5-12 Samsung Electronics

71 L_BRN N_SKY REACTOR_B2,A2 REACTOR_B1,A1 CN351 CN901 CN911 COMP 1 L_BRN - POWER 2 N_SKY - POWER 3 B2,A2 - REACTOR 4 B1,A1 - REACTOR #1 : AC POWER #1 : AC POWER #REACTOR B2 : BLK #REACTOR A2 : BLK #REACTOR B1 : WHT #REACTOR A1 : WHT 5 COMP 6 CN911 - FAN1 7 CN901 - FAN1 8 CN351 - COMM INV #CN401 : U-PHASE (RED) #CN402 : V-PHASE (BLU) #CN403 : W-PHASE (YEL) #1 : DC310 #2 : NC #3 : GND #4 : DC 15V #5, #6 : SIGNAL #1 : DC310 #2 : NC #3 : GND #4 : DC15V #5, #6 : SIGNAL #1 - #2 : SIGNAL #3 : GND #4 : VCC #5 : 12V #6 : SIGNAL Samsung Electronics 5-13

72 1 L1 - AC POWER L phase 2 N1 - AC POWER N phase 3 CN01 - AC POWER #L1 : BRN #N1 : SKY - BLU #1 - #3 : AC 220~240V 5-14 Samsung Electronics

73 1 CN330 2 CN300 3 CN CN450 CN704 4 CN CN451 CN CN453 CN452 7 CN COMM CN300 - DOWNLOAD #1 : 12V #2 : GND #3 : 5V #4 : Signal 1 #5 : Signal 2 #1-9 : Download Signal #14 : Download Signal #18-20 : Download Signal #10 : VCC #17: GND CN75 - SMPS IN CN706 - EEV_D #1,5 : 12V #2-3 : signal CN706 CN SMPS EEV_F IN CN331 - POWER CN452 - PIPE_IN #1,3 : Sensor signal #1,5 : 12V #1 : 12V #2 : GND #2-3 : signal #2 : GND CN706 CN SMPS EEV_E IN #1,5 : 12V #2-3 : signal CN75 - SMPS IN CN453 - PIPE_OUT #1,3 : Sensor signal #2 : GND CN451 - PIPE_OUT #1,3,5,7 : Sensor signal #2,4,6,8 : GND CN450 - PIPE_IN #1,3,5,7 : Sensor signal #2,4,6,8 : GND Samsung Electronics 5-15

74 6. Wiring Diagram 6-1. INDOOR UNIT #,,0#&%* Samsung Electronics 6-1

75 This Document can not be used without Samsung s authorization. 6-4 Samsung Electronics

76 Samsung Electronics 6-5

77 6-10 Samsung Electronics

78 8. Preference Sheet 8-1 Selecting Area for Installtaion Select an area for installation that is suitable to customer s needs Indoor Unit 1. Make sure that you install the indoor unit in an area providing good ventilation. It must not be blocked by an obstacle affecting the airflow near the air inlet and the air outlet. 2. Make sure that you install the indoor unit in an area allowing good air handling and endurance of vibration of the indoor unit. 3. Make sure that you install the indoor unit in an area where there is no source of heat or vapor nearby. 4. Make sure that you install the indoor unit in an area from which hot or cool air is spread evenly in a room. 5. Make sure that you install the indoor unit in an area away from TVs, audio units, cordless phones, fluorescent lighting fixtures and other electrical appliances (at least 1 meter). 6. Make sure that you install the indoor unit in an area which provides easy pipe connection with the outdoor unit, and easy drainage for condensed water. 7. Make sure that you install the indoor unit in an area which is large enough to accommodate the measurements shown in figure on the next page. It is harmful to the air conditioner if it is used in the following environments: greasy areas (including areas near machines), salty areas such as coast areas, areas where sulfuric gas is present such as hot spring areas. Contact your dealer for advice. Samsung Electronics 8-1

79 8-2 Samsung Electronics

80 8-2 Connecting Up and Purging the Circuit When installing, make sure there is no leakage. When recovering the refrigerant, ground WARNING connected and the compressor works with the service valve open, the pipe inhales the air and it makes the pressure inside of the refrigerant cycle abnormally high. It may cause explosion and injury. The outnt R-410A refrigerant. Do not vent R-410A into atmospherated greenhouse gas, You should purge the air in the indoor unit and in the pipe. If air remains in the refrigerant pipes, it aects the compressor. Refrigerant for air purging is not charged in the outdoor unit. Use Vacuum Pump as seen in the picture. 2. Connect the charging hose of low pressure side of manifold gauge to the packed valve having a service port. CAUTION Valve stem Stem Cap Service port Model Name Valve 3/8 1/2 AJ020MCS3CH 2 1 AJ024MCS4CH 2 2 AJ030MCS4CH Open the valve of the low pressure side of manifold gauge counter clockwise. 4. Purge the air from the system using vacuum pump for about 30 minutes. 5. Close the valve of the low pressure side of manifold gauge clockwise psi 30 minutes. This procedure is very important in order to avoid gas leak. 7. Tvacuum pump. 8. Remove the hose of the low pressure side of manifold gauge. 9. Set valve cork of both liquid side and gas side of packed valve 10. Mount the valve stem nuts and the service port cap to the valve, Outer Diameter (inch) Tightening torque Body cap 0.14 to to to 0.25 Charging port 0.07 to 0.09 Samsung Electronics 8-3

81 8-3 Refrigerant Re ll 8-4 Samsung Electronics

82 8-4 Refrigerant Adjustment AJ***MCS*CH AJ***MCS*CH 8-5 Flare Nut Fixing Torque Samsung Electronics 8-5

83 8-6 "Pump down" Procedure 8-6 Samsung Electronics

84 8-7 Index of Model Name Indoor AJ (1) 009 N J (2) (3) (4) A (5) D (6) C H / (7) (8) AA Buyer (1) Model AM DVM AJ FJM AC CAC AR RAC (2) Capacity X 1,000 Btu/h (2digits) (3) Year F 2013 H 2014 J 2015 K 2016 M 2017 (4) Inverter type N Indoor (NASA) (5) Feature A RAC-A3050 N MINI 4WAY M MSP Duct L LSP Duct (6) Series (RAC) F FLAGSHIP (Best) P PREMIUM (Better) D DELUXE (Good1) S STANDARD (Good2) (7) Rating voltage A 115,60Hz, 1 B 220V, 60Hz C 208~230, 60Hz D 200~220V, 50Hz E 220~240V, 50Hz F 208~230V, 60Hz, 3 G 380~415V, 50Hz, 3 H 380V, 60Hz, 3 J 460V, 60Hz, 3 K 220~240V, 50/60Hz F 208~230V, 60Hz, 3 M 127V, 50Hz N 380~415, 50/60Hz, 3 (8) Mode / Refrigerant C Cooling only H Heat pump R410A R Heat recovery D Cooling only R22 E Heat pump A Cooling only R134A (9) Buyer AA USA 8-8 Samsung Electronics

85 Outdoor AJ 020 M C S 3 (1) (2) (3) (4) (5) (6) C H / (7) (8) AA Buyer (1) Model AM DVM AJ FJM AC CAC AR RAC (2) Capacity X 1/10HP (3digits) X 1/10kW (3digits) X 1,000 Btu/h (3digits) (3) Year F 2013 H 2014 J 2015 K 2016 M 2017 (4) Product type N Indoor unit(nasa) X Outdoor unit(nasa) B Indoor unit(non NASA) Outdoor unit C (Non NASA) (5) Product notation V DVM Inverter A CAC Inv+Side+T1 J FJM S Nordic (6) Max room number 2 2 rooms 3 3 rooms 4 4 rooms 5 5 rooms (7) Rating voltage A 115,60Hz, 1 B 220V, 60Hz C 208~230, 60Hz D 200~220V, 50Hz E 220~240V, 50Hz F 208~230V, 60Hz, 3 G 380~415V, 50Hz, 3 H 380V, 60Hz, 3 J 460V, 60Hz, 3 K 220~240V, 50/60Hz F 208~230V, 60Hz, 3 M 127V, 50Hz N 380~415, 50/60Hz, 3 (8) Mode / Refrigerant C Cooling only H Heat pump R410A R Heat recovery D Cooling only R22 E Heat pump A Cooling only R134A (9) Buyer EU Europe 8-12 Samsung Electronics

86 8-8 Refrigerating Cycle Diagram Samsung Electronics 8-13

87 8-9 Pressure & Capacity mark Power/Heat W cal/s kcal/h Btu/h HP kg. m/s ib. m/s x , The abbreviated technology words & the definition of technology terms Abbreviated technology words COMP(Full name compressor) BLOWER FAN ASS Y CONTROL BOX (Full name : Assemble control box) MOTOR ASS Y EVAP/ASS Y COND (Full name : assemble evaporator / assemble condenser) Definition of technology terms One that compresses, especially a machine used to compress gases. One that blows, especially a mechanical device, such as f fan, that produces a current of air. A device for reeating a current of air or a breeze. A restraining device of air-condition, measure, or limit. Something, such as a machine or an engine, that produces or imparts motion. Heat exchanger; A device, used to transfer heat from a fluid on one side of a barrier to a fluid on the other side without bringing the fluids into direct contact Samsung Electronics

88 8-11 Q & A for Non-trouble Classification Class Description Cooling Leakage Smells Q A Q A Q A Q A Q A Q A Q A Q A The cooling is weak. When it is hot outside, its cooling capacity decreases due to the increase of the ambient temperature. When the dust filter gets blocked or warm outside air gets in, the cooling capacity will decrease. So, make sure to clean the dust filter frequently, prevent heat loss by closing the doors and insulate the cooling area by using curtains, blinds, shades or window tinting. The cooling is good generally. But, it gets weak when it is considerably hot. It occurs when the outdoor unit is exposed to direct sun light and heat-up air is not ventilated well. So, set up a sunblind over the outdoor unit and keep stuff away from the unit to increase the ventilation. When the cooling capacity decreases during a heat wave, clean the heat exchanger of the outdoor unit or spray some cold water to the heat exchanger to increase the cooling capability. The cooling is weak. Does it need refrigerant charging? It is not correct charging refrigerant regularly. Except that you have moved in several times or the connection pipes are broken, the refrigerant does not run low. So, when refrigerant is additionally charged, it could be costly and cause a product's failure. When the refrigerant leaks, all of it will escape in a short time resulting in cooling failure and no water coming out of the drain hose. So, if water comes out from the drain hose, it indicates the normal operation of the product and it does not need refrigerant charging. It fails to do cooling. When the air conditioner is set to Ventilation or the desired temperature is set higher than the current temperature, it fails to do cooling. In this case, select Cooling or set the desired temperature lower. It floods the floor. Place the drain hose properly. When it is not placed properly, the drain water would flow back flooding the floor. So, straighten out the drain hose for the water to be drained well. Water drips at the drain connection (service valve) of the outdoor unit. When a glass bottle is taken out of the refrigerator, moisture gets condensed on its surface due to the temperature differences. The same principle applies to the air conditioner. When cold refrigerant goes through the copper tube, moisture gets condensed on the surface of the tube and the connection areas. To prevent the water condensation, the pipes are insulated. But, the connection areas of the outdoor unit are not insulated for the purpose of maintenance or repair, and water gets condensed due to the temperature differences and drips down. Generally, it evaporates right away. But, when it drips much during muggy days, put a water pan on the floor. It leaks even though a drain pump is used. It occurs when the drain pump is plugged out or it is out of order. Check the power of the drain pump and the position of the drain hose, and when the pump is faulty, contact the drain pump manufacturer. Samsung Electronics do not manufacture drain pumps. So, we are not able to correct the drain pump problems. Whenever the air conditioner is turned on, it irritates my eyes and gives me a headache. There are no components in the air conditioner irritating the eyes and sending out chemical smells. But, when the air conditioner is turned on, other smell sources are sucked into the air conditioner and get out of it. So, find and root out the smell sources. Generally, it occurs at a interior renovated place, a pharmacy, a gasoline handling place, a tire shop, a second-hand book shop or an electronic Samsung Electronics 8-17

89 Q & A for Non-trouble (cont.) Classification Class Description component handling place; when its chemical or musty smells are sucked in and sent out, it can be misled that the air conditioner generates them. So, find and root out the problem or refresh the room frequently. Smells Operation Q A Q A Q A Q A Q A Q A Q A Q A Whenever the air conditioner is turned on, it stinks. There are no components in the air conditioner sending out chemical smells. But, when the air conditioner is turned on, other smell sources are sucked into the air conditioner and get out of it. So, find and root out the smell sources. Generally, when the drain hose is taken out to the washing room or there are sources of smells such as a diaper bin, a shoe shelf or a socks bin, bad smells generate. Also, it occurs where glass cleaners or air fresheners are used; when they are sucked in interacting with dusts and moistures inside, bad smells generate. These kinds of organic materials noxious to human bodies. So, we recommend against the use of them. Whenever the air conditioner is turned on, it smells sour. When the room is papered recently, its paste smells would be sucked inside. Also, when the air conditioner is installed in the study room of young boys loving sweat-generating activities such as the basketball, excessive sweats evaporate and get sucked into the air conditioner resulting in bad smells. So, find and root out the problem or refresh the room frequently. Whenever the air conditioner is turned on, it smells musty. It is due to the improper keeping of the product after its use. When keeping the product, dry up the inside with the operation of Ventilation to prevent must. When the product is kept without drying up the inside with Ventilation, mold would grow inside resulting in must. So, open the windows and switch on the Ventilation function to get rid of the saturated smell inside. Whenever the air conditioner is turned on, it sends out bad smells such as stale smells. It occurs generally when there are pet animals in the house. Their smells stay at the same place. But, when the air conditioner is turned on, the air gets circulated resulting in the circulation of the smells. So, find and root out the problem or refresh the room frequently. It sends out bad smells. When the air filter is filthy, it could send out bad smells. So, clean the filter and ventilate the room with the windows open while operating the Ventilation function. It won't start. There is a power failure or it is plugged out. Also, check if the power distribution panel is switched off. It goes off during operation. When the hot air does not escape properly, it goes off during operation. It occurs when it does not ventilate properly because the outdoor unit is covered, the back of the outdoor unit is blocked by a cardboard or a plywood panel, and the front of the outdoor unit is blocked by the closed window or other obstacles. Clear the above obstacles from the outdoor unit. It generally works properly. But, when it's considerably hot, it goes off during operation. It occurs when the outdoor unit is exposed to direct sunlight and the hot air does not escape properly. Set up a sun blind over the outdoor unit and clear the neighboring obstacles from the outdoor unit to provide good ventilation. When it goes off frequently during a heat wave, it would prevent the turn-off and increase the cooling capacity cleaning the outdoor unit or spraying some water to the heat exchanger Samsung Electronics

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