Panasonic CU-2S18NBU-1 Air Conditioner User Manual
Contents
1. 20 compressor is operating and valves are opened condition will cause suck in of air abnormal high pressure in refrigeration cycle and result in explosion injury etc 21 After completion of installation or service confirm there is no leakage of refrigerant gas It may generate toxic gas when the refrigerant contacts with fire 22 Ventilate if there is refrigerant gas leakage during operation It may cause toxic gas when the refrigerant contacts with fire 23 Do not insert your fingers or other objects into the unit high speed rotating fan may cause injury Q 24 Must not use other parts except original parts describe in catalog and manual 25 Using of refrigerant other than the specified type may cause product damage burst and injury etc CAUTION 1 Do not install the unit at place where leakage of flammable gas may occur In case gas leaks accumulates at surrounding of Q the unit it may cause fire 2 Carry out drainage piping as mentioned in installation instructions If drainage is not perfect water may enter the room and damage the furniture 3 Tighten the flare nut with torque wrench according to specified method If the flare nut is over tightened after a long period the flare may break and cause refrigerant gas leakage 4 Do not touch outdoor unit air inlet and aluminium fin It may cause injury Q 5 Select an installation location which is easy for maintenance Pb free solder has a higher m2. 26 15 Disassembly and Assembly Instructions 28 15 1 Outdoor Unit Removal Procedure 28 16 Technical Data eere 31 16 1 Operation Characteristics 31 17 Exploded View and Replacement Parts List 41 1 Safety Precautions Read the following SAFETY PRECAUTIONS carefully before perform any servicing Electrical work must be installed or serviced by a licensed electrician Be sure to use the correct rating of the power plug and main circuit for the model installed The caution items stated here must be followed because these important contents are related to safety The meaning of each indication used is as below Incorrect installation or servicing due to ignoring of the instruction will cause harm or damage and the seriousness is classified by the following indications A WARNING This indication shows the possibility of causing death or serious injury A CAUTION This indication shows the possibility of causing injury or damage to properties The items to be followed are classified by the symbols Q This symbol denotes item that PROHIBITED from doing Carry out test running to confirm that no abnormality occurs after the servicing Then explain to user the operation care and maintenance as stated in instructions Please remind the customer to keep the operating instructions for future reference
3. Operation condition 81 F DBT 66 F WBT High fan speed Outdoor temperature 95 F DBT Compressor Freq Gas Side Piping Pressure PSI Current A Capacity kW Outlet Air F 208V 230V 7 10 6 80 6 50 6 20 5 90 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 208V 230V 9 0 190 290 390 490 590 690 790 890 Piping Length ft 208V 230V 4 905 4 805 4 705 4 605 4 505 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 208V 230V 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 38 16 1 5 CS ST2NKUW 1 CS S9NKUW 1 CU 2S18NBU 1 Cooling Characteristic Room temperature 81 DBT 66 WBT Operation condition High fan speed Piping length Compressor Freq Gas Side Piping Pressure PSI Current A Capacity KW Outlet Air F 24 6ft Fc 608 668 728 788 848 908 968 1028 1088 114 8 Outdoor Temperature F 9 208V 230V 158 0 154 0 150 0 146 0 142 0 608 668 728 788 848 908 968 102 8 1088 114 8 Outdoor Temperature F 60 8 668 728 788 848 908 968 1028 1088 114 8 Outdoor Temperature F 208 230V 60 8 668 728 788 848 908 968 102 8 108 8 114 8 Outdoor Temperature
4. unit each ID eng Wire size wire size Gas Liquid gas Outdoor OD CU 2818NBU 1 Indoor ID 2 UNITS OF CS S9NKUW 1 Outdoor OD CU 2818NBU 1 208 230V 16700 Raoa PAER T QAM 2465 4921 ost 82 01 t640ft 6561 02oz ft 6082 AWG12 AWG16 MOP 25A Outdoor OD CU 2818NBU 1 Indoor ID 1 UNIT OF CS S9NKUW 1 1 UNIT OF CS S12NKUW 1 Example If total piping length of all installed indoor units is at 68 6 ft the quantity of additional refrigerant should be 0 6 oz 68 6 65 6 ft x 0 2 oz ft 0 6 oz 14 10 Installation Instruction 10 1 SELECT THE BEST LOCATION 10 1 1 OUTDOOR UNIT If an awning is built over the unit to prevent direct sunlight or rain be careful that heat radiation from the condenser is not obstructed e There should not be any animal or plant which could be affected by hot air discharged e Keep the spaces indicated by arrows from wall ceiling fence or other obstacles e Do not place any obstacles which may cause short circuit of the discharged air e Recommended installation height for outdoor unit should be above the seasonal snow level Refrigerant piping size Outdoor Unit CU 2818 Liquid side 21 4 thickness 1 32 Gas side 23 8 thickness 1 32 Outdoor Unit CU 2818 Min total piping length for 65 6 ft additional gas e ftotal piping length of all indoor units exceeds the minimum l
5. 1 6019 1 nn este 42 Vl T mmm t 209 LAOSZ VOE 10 3 13 13 9 Installation Information 9 1 Check Points Flexible cord x 4 core peat a ae TT polychloroprene sheathed Indoor outdoor unit conection cables Outdoor unit power supply Single phase 208 230V 60Hz Not included in the unit Unit B 20A switch circuit breaker Not included in the unit Flexible cord x 4core polychloroprene sheathed Not included in the unit Flexible cord x 3 core Not included in the unit Unit A Allowable elevation 49 2 ft max The allowable elevation between each of the indoor units and between the indoor and outdoor units Applicable connecting tube kit CZ 3F type D Unit A Maximum pipe length 82 0 ft eik bo Unit Maximum pipe length 82 0 ft ok on Total maximum pipe length 164 ft Grounding work Air purging Air purging by vacuum pump QUICK GUIDE PIPING amp ELECTRICAL SPECIFICATION iping si Standard Min pipe eS OD ID Indoor ID amp Outdoor OD units Capacity Refri t Piping size ener Max length for from Gal Additional Power pus ti Possible Combination Patterns Btu h DU Elevation each ID OD to p b ir e refrigerant supply SUPP Y
6. 15 Block Diagram 9 10 2 INSTALL THE OUTDOOR UNIT 17 Ock Diagrami edere 103 CONNECT THE 17 Wiring Connection 10 10 4 EVACUATION OF THE EQUIPMENT 18 El ic Circuit Di 11 10 5 CONNECT THE CABLE TO THE Sc Uone Circuit DIR Fathers OUTDOOR UN uscire ss 18 Printed Circuit Board 12 10 6 022 19 S Main Printed Circuit Board 12 11 Operation 20 Noise Filter Printed Circuit pu m 13 p anason IC Panasonic HA Air Conditioning M Sdn Bhd 2011 Unauthorized copying and distribution is a violation of law 12 12 Valve close detection control 23 12 13 Compressor discharge high pressure protection 23 13 Servicing Mode sss 24 13 1 Pump Down Operation 24 13 2 Test 24 13 3 Wiring Error 24 13 4 Power Save 25 13 5 priority function 25 14 Troubleshooting Guide 26 14 1 Self Diagnosis Function
7. 230V 4 80 lt 4 60 4 40 5 420 4 00 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 208V 230V 2 amp S35 DB 49 a E 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 208V 230V 3 490 3290 3 090 u S 3 2 890 2 690 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 208V 230V 58 95 58 45 57 95 5 4 5745 56 95 56 45 55 95 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 36 16 1 4 CS S12NKUW 1x2 CU 2S18NBU 1 e Cooling Characteristic o Room temperature 81 F DBT 66 F WBT o Operation condition High fan speed o Piping length 24 6ft o Compressor Freq Fc Current A 60 8 668 728 788 848 908 968 1028 108 8 1148 Outdoor Temperature F 208 230V 159 5 155 5 151 5 147 5 Gas Side Piping Pressure PSI 143 5 608 668 728 788 848 908 968 1028 1088 114 8 Outdoor Temperature F 208 230V 6 205 5 705 5 205 4 705 Capacity kW 4 205 608 668 728 788 848 908 968 1028 1088 1148 Outdoor Temperature F 208V 230V 61 75 60 75 59 75 58 75 Outlet Air F 57 75 56 75 608 668 728 788 848 908 968 102 8 1088 114 8 Outdoor Temperature F 37 Piping Length Characteristic
8. 147 2 146 2 145 2 144 2 143 2 142 2 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 208V 230V 5 400 5 200 5 000 4 800 4 600 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 208V 230V 60 40 60 00 59 60 59 20 58 80 9 0 19 0 290 390 49 0 590 690 79 0 89 0 Piping Length ft 34 16 1 3 CS S12NKUW 1 CU 2S18NBU 1 Cooling Characteristic Room temperature Operation condition Piping length Compressor Freq Gas Side Piping Pressure PSI Current A Capacity KW Outlet Air F 81 DBT 66 WBT High fan speed 24 6ft Fc 60 8 668 728 788 848 908 968 1028 1088 114 8 Outdoor Temperature F 208 230V 148 0 143 0 138 0 133 0 128 0 60 8 668 728 788 848 908 968 1028 1088 1148 Outdoor Temperature F 208V 230V 4 175 3 875 3 575 3 275 2 975 2 675 60 8 668 728 788 848 908 968 1028 108 8 114 8 Outdoor Temperature F 208V 230V 59 40 58 40 57 40 56 40 55 40 54 40 53 40 60 8 668 728 788 848 908 968 102 8 1088 114 8 Outdoor Temperature F 35 e Piping Length Characteristic o Room temperature 81 F DBT 66 F WBT o Operation condition High fan speed o Outdoor temperature 95 F DBT o Compressor Freq Fc 208V
9. F 39 e Piping Length Characteristic o Room temperature Operation condition 81 F DBT 66 F WBT High fan speed o o Outdoor temperature 95 F DBT o Compressor Freq Gas Side Piping Pressure PSI Current A Capacity kW Outlet Air F 208V 230V 7 25 7 05 6 85 6 65 6 45 6 25 6 05 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 152 0 150 0 148 0 146 0 144 0 9 0 19 0 29 0 39 0 49 0 59 0 690 79 0 89 0 Piping Length ft 5 245 5 145 5 045 4 945 4 845 4 745 4 645 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 208 230V 60 75 60 25 59 75 59 25 58 75 9 0 19 0 29 0 39 0 490 590 690 79 0 89 0 Piping Length ft 40 f m 4 T 7 Q iNi 3 3 v Exploded View and Replacement Parts List 17 Note The above exploded view is for the purpose of parts disassembly and replacement 41 numbered parts are not kept as standard service parts The non REF DESCRIPTION amp QTY CU 2S18NBU 1 REMARK 1 BASE PAN ASS Y 1 CWD52K1240A 2 SOUND PROOF BOARD 1 CWH151230 3 FAN MOT
10. N WARNING Do not modify the machine part material during repairing service 2 _ If wiring unit is supplied as repairing do not repair or connect the wire even only partial wire break Exchange the whole wiring unit 3 Do not wrench the fasten terminal Pull it out or insert it straightly 4 Engage authorized dealer or specialist for installation and servicing If installation or servicing done by the user is defective it will cause water leakage electrical shock or fire 5 Install according to this installation instructions strictly If installation is defective it will cause water leakage electric shock or fire 6 Use the attached accessories parts and specified parts for installation and servicing Otherwise it will cause the set to fall water leakage fire or electrical shock 1 Install at a strong and firm location which is able to withstand the set s weight If the strength is not enough or installation is not properly done the set will drop and cause injury 8 For electrical work follow the local national wiring standard regulation and the installation instruction An independent circuit and single outlet must be used If electrical circuit capacity is not enough or defect found in electrical work it will cause electrical shock or fire 9 This equipment is strongly recommended to be installed with Earth Leakage Circuit Breaker ELCB or Residual Current Device
11. 21 12 5 Cooling overload control Cool This control detect outdoor pipe temperature and perform the compressor frequency restriction during cooling operation Comp freq restricted 147 2 140 F 134 6 F OD Pipe temp 12 6 Time Delay Safety Control Restart Control The compressor will not restart within three minutes after compressor is stopped This control is not applicable if the power supply reset 12 7 30 seconds Force Operation Once the compressor starts operation it will not stop its operation for 30 seconds in order to cycle back compressor oil However it can be stopped using remote control or Auto OFF ON button at indoor unit 12 8 Total Current Control By referring to table below during normal default operation the running current refer to Hi values and during Power Save Mode the running current refer to Lo values When the outdoor unit total running current AC exceeds X value compressor frequency will decrease If the running current does not exceed X value for 5 seconds compressor frequency will increase However if total outdoor unit running current exceeds Y value compressor will be stopped immediately for 3 minutes CU 2818NBU 1 Operation Mode X A Y A Hi 14 0 17 5 Cooling Soft Dry A pt Lo 7 8 17 5 Hi 14 0 17 5 Cooling Soft Dry B Lo 7 8 17 5 12 9 IPM power transistor Protection Control Overheating Prevention Control o If IPM temper
12. Compressor e Power transistor F93 abnormal happen within abnormal module faulty or revolution 20 minutes revolution compressor lock Compressor discharge 4 times Compressor e Check F94 pressure happen within discharge pressure refrigeration overshoot 30 minutes overshoot system protection Outdoor cooling 4 times Cooling high 95 high pressure O happen within pressure X protection 20 minutes protection RC Outdoor air circuit Power transistor module 3 times Power transistor FCB faulty ne Dad overheating o o o TE within module overheat Outdoor air circuit protection minutes fan motor sumes Compressor e Insufficient F97 overheating O happen within overheat Fefri erant protection 30 minutes g Check Total running 3 times Total current refrigeration F98 current happen within system protection protection 20 minutes e Power source or compressor lock Outdoor direct Continuous Power transistor e Power transistor F99 current DC happen for 7 module current module faulty or peak detection times protection compressor lock LED 1 illuminate is indicated that outdoor unit is operating normally If the LED 1 is switched off or flashing check the power supply and self diagnosis indication Illuminate Flashing Blank OFF 27 15 Disassembly and Assembly Instructions CN W
13. Continuous m temperature temperature sensor for 5s sensor open or sensor lead wire abnormality short circuit and connector Outdoor heat Outdoor heat e Outdoor heat exchanger exchanger exchanger H28 temperature ous temperature temperature sensor 1 S sensor 1 open or sensor 1 lead wire abnormality short circuit and connector Outdoor heat Outdoor heat e Outdoor heat exchanger Continuous exchanger exchanger H32 temperature temperature temperature or 5s sensor 2 Sensor 2 open or sensor 2 lead wire abnormality short circuit and connector Indoor outdoor Indoor and e Indoor and H33 misconnection outdoor rated outdoor units abnormality voltage different check E gas Heatin Outdoor gas pipe e Outdoor gas pipe H36 l ari Continuous rollos temperature temperature sensor for 5s operation only sensor open or sensor lead wire short circuit and connector abnormality Outdoor liquid eu Outdoor liquid Outdoor liquid H37 Continuous BIG pipe temperature pipe temperature S neor for 5s operation only sensor open or sensor lead wire i short circuit and connector abnormality Outdoor high High pressure High pressure H64 pressure S Continuous sensor open sensor sensor for 1 minutes circuit during e Lead wire and abnormality compressor stop connector Outdoor fan Outdoor fan motor motor 2 times Outdoor fan motor lead wire and H97 mechanism happen within lock or feedbac
14. circuit breaker e Connect the UL listed or CSA approved wires minimum AWG12 to the terminal board and Valve Covor connect to other end of the wires to circuit Metal ra Knock Out Holes breaker 4 7 Connect the power supply cord and connecting wires between indoor unit and outdoor unit according to the diagram as shown Top Panel Control Board Cover Metal 18 Terminals on the indoor unit Colour of wires Connecting cable Terminals on the outdoor unit Power supply cord UNIT A UNIT B Power Supply Power Supply Indoor amp outdoor Cord connection wire Indoor Indoor Unit A Unit B 8 For wire stripping and connection requirement refer to the diagram below 9 Secure the power supply cord and connecting cables onto the control board with the holder 10 Attach the control board cover metal and resin and valve cover back to the original position with screw WIRE STRIPPING AND CONNECTING REQUIREMENT Wire strippin pping Conductor fully Conductor over Conductor not inserted inserted fully inserted Indoor outdoor connecting terminal board 25 128 f or more loose strand when inserted gap between ACCEPT PROHIBITED PROHIBITED wires 25 64 x 5 128 10 6 HEAT INSULATION Use a material with good heat resistant properties as the heat insulation for A CAUTIO
15. ia vw m a dts v 4 r F esa 6 g uk 7 4 1 ee 24 x E AiE 2 WU 544 5 Jp 02 ase ae uL t T 5 as X By te fa gt 0 1 2 at 2 Ja H ote D s o lt aaa 1 H 2 P ee as P 4 4 p q 5 ate r 2 aes j lt 5 i D a 4 rg 2 H atten E sto 99 2 f ri 1 s gt 4 eal gt TUR z 4 vL T i eS 5 2 e H ae s 2 ib lt s sH E see n ri F4 i CN TH4 mis Ut TE slr qu E sinas Ra Ro 2 79 12 B tt ei 8 2 Noise Filter Printed Circuit Board 19 197 21707 o RO ora 11902 01702 CRO sorce sce 0 2 20402 o RO 0toe bi zzry 90102 10302 eO 2090 sore e e 5192 5192 9 tS ur Y I e c 2 uc t4 0 010 m xecr a v cn wHT see gt KJ v CN WHT c402 gt 1 CN BLK BLACK e 1 e EO GREEN 1400 SIROS
16. 10 60 INSTALLATION INSTRUCTION 1 CWF615180 61 MANIFOLD TUBE ASS Y GAS 1 CWT07K1522 62 TUBE ASS Y LIQUID 1 1 CWT026316 63 TUBE ASS Y LIQUID 2 1 CWT026872 64 CONTROL BOARD COVER 1 CWH131364 65 CLIP FOR SENSOR HOLDER 3 CWH711010 66 BAG 1 CWG861154 67 BASE BOARD COMPLETE 1 CWG62C1081 68 SHOCK ABSORBER RIGHT 1 CWG712879 42 REF DESCRIPTION amp NAME QTY CU 2S18NBU 1 REMARK 69 SHOCK ABSORBER LEFT 1 CWG712880 70 C C CASE 1 CWG565609 76 TERMINAL COVER 1 CWH171035 77 NUT TERMINAL COVER 2 CWH7080300J Note All parts are supplied from PHAAM Malaysia Vendor Code O marked parts are recommended to be kept in stock 43 00029488 Printed in Malaysia SB1111 0
17. 2S18NBU 1 Indoor Unit Combination 3 2kW 3 2kW 1 Phase 208 230V 60Hz Power supply from outdoor unit 4 89 2 10 5 86 16700 7200 20000 Running Current A 7 6 6 9 Electrical Power Input kW 1 45 0 39 1 84 Data EER W W 3 37 5 38 3 18 BTU hW 11 50 18 45 10 85 Sound Pressure Level dB A 48 Power Source Capacity Cooling Operation Sound Power Level dB 62 Maximum Current A Starting Current A 7 8 Minimum Circuit Ampacity A 20 mm inch 795 31 5 16 Dimension mm inch 875 95 34 15 32 3 3 4 mm inch 320 12 5 8 Net Weight kg Ib 69 152 Connection Cable 3 1 Earth 21 5 mm Pipe Length Range 1 room m ft 3 25 9 8 82 0 Maximum Pipe Length Total Room m ft 50 164 0 Liquid Side mm inch 6 35 1 4 Gas Side mm inch 9 52 3 8 Refrigerant Pipe Diameter Type Hermetic Rotary Compressor Motor Type DC Brushless 4 poles Rated Output 1 30k Type Propeller Fan Air Circulation Motor Type DC Brushless 8 poles Rated Output 60 Fan Speed High 650 Type Plate fin configuration forced draft type Tube Material Copper Heat Exchanger Fin Material Aluminum Row Stage 2 36 FPI 19 Air Volume High m min ft min 37 2 1313 Refrigerant Control Device Expansion Valve Refrigerant Oil FV50S Refrigerant R410A 1 92k 67 8 Dry Bulb Wet Bulb Maxim
18. 945 2 845 2 745 Capacity kW 2 645 2 545 39 0 Piping Length ft 490 59 0 9 208V 230V 59 60 59 10 58 60 Outlet Air F 58 10 57 60 9 0 190 290 390 490 590 Piping Length ft 32 690 790 890 16 1 2 CS S9NKUW 1x2 CU 2S18NBU 1 Cooling Characteristic Room temperature 81 DBT 66 WBT Operation condition High fan speed Piping length Compressor Freq Gas Side Piping Pressure PSI Current A Capacity KW Outlet Air F 24 6ft Fc 208V 230V 60 8 668 728 788 848 908 96 8 1028 1088 1148 Outdoor Temperature F 60 8 66 8 728 788 848 908 96 8 1028 108 8 114 8 Outdoor Temperature F 208V 230V 6 190 5 690 5 190 4 690 4 190 608 668 728 788 848 908 968 1028 1088 1148 Outdoor Temperature F 60 8 668 728 788 848 90 8 96 8 1028 1088 1148 Outdoor Temperature F 33 e Piping Length Characteristic o Room temperature Operation condition 81 F DBT 66 F WBT High fan speed o o Outdoor temperature 95 F DBT o Compressor Freq Gas Side Piping Pressure PSI Current A Capacity kW Outlet Air F 208V 230V 7 15 6 95 6 75 6 55 6 35 6 15 9 0 19 0 29 0 39 0 49 0 59 0 69 0 79 0 89 0 Piping Length ft 208 230V
19. ARNING High Voltages are generated in the electrical parts area by the capacitor Ensure that the capacitor has discharged sufficiently before proceeding with repair work Failure to heed this caution may result in electric shocks 15 1 Outdoor Unit Removal Procedure A Caution When handling electronic controller be careful of electrostatic discharge 15 1 1 Removing the Cabinet Top Plate and Cabinet Front Plate 1 Remove the cabinet top plate remove the 8 screws 2 Remove the 8 screws 1 on the center 3 at the top and 4 at the bottom securing the cabinet front plate release the 2 hooks 1 each at the left and right and pull the cabinet front plate toward front side 7 4 Remove the particular plate remove 2 screw 5 Remove the particular plate remove 2 screw 28 15 1 3 Removing the Control P C Board 6 Remove the drip proof cover 7 Disconnect the connectors lead wires of the compressor sensor and others 8 Remove the screw at the right side of the control box and pull out the entire control box 9 Release the control P C Board tab to remove the control P C Board 15 1 4 Removing the Propeller Fan and Fan Motor 1 Follow the steps in 15 1 1 for removing the cabinet top plate and cabinet front plate 2 Remove the propeller fan by removing the nut turning clockwise at its center 29 Disconnect the fan motor connector from the control Board Lo
20. CHANGER N WAY VALVE VALVE 8 l INTAKE I MES e SENSOR TEMP SENSOR HEAT EXCHANGER 1 VALVE STRAINER gt ent teet eet EXCHANGER VALVE EVAPORATOR 1 INDOOR SENSOR BANAY VALVE kik 5 Block Diagram 6 Wiring Connection Diagram 1114 g LINN HOOANI OL Lus ll Lm o Lus lol 55 V LINN OL 3 3 3 SJ m 5 gy Mim m En _ rn 6559 15999 28 78 ABS AUD WOLOY3U aa WNIWYSL JWOD tu OnivW3avl ams G 1zavxveL axis NOILO3NNOO sBuipulM 10 44 105 jo eouejsisoH x 2 5 E 10 7 Electronic Circuit Diagram 2 031 N339 EE 009 BAVS HIMOd PMS EMS HI HI HOOQNI OL The unit turn to the Rated Frequency Cooling Operation by short circuiting CN S after applying power between the terminal 1 and 2 Operation of the compressor and the outdoor fan motor can be checked by applying power after short circuiting CN S OL 13504 x FT cR ELI Hi k balina 8 Printed Circuit Board 8 1 Main Printed Circuit Board 5 E 4 E HERI mene i 4 7 N an E A sva 5 N J z B ke
21. EST switch SW2 on the display printed circuit board inside the outdoor unit For cooling test press the TEST OPERATION switch SW2 for more than 5 seconds LED 1 and LED 2 will illuminate when shift into cooling test operation 13 3 Wiring Error Check This product capable to correcting the wiring errors automatically by following procedures Confirm the valve on the liquid side and gas side is open Press WIRING CHECK switch SW3 on the display printed circuit board for more than 10 seconds to start wiring check operation Wiring check process will complete in approximately 10 minutes However wiring check operation will not start within 3 minutes after compressor is stopped When outdoor air temperature is less than 41 F or unit has abnormality wiring check will not start See NOTE 2 The LED 2 to 6 in display printed circuit board inside the outdoor unit indicate whether correction is possible or not and the status of the correction as shown in the table below LED 3141516 ROOM A B All flashing Automatic correction impossible Status LED 2 4 6 and LED 3 5 alternatively flashing Wiring check in progress Flashing one after Automatic correction completed another Other than above Unit has abnormally Note 4 If automatic correct is impossible check the indoor unit wiring and piping manually Fig 1 SW1 PUMP DOWN S
22. Indoor A combination Operation W F Pu Nori Operation Class kW Rating Min Max Rating Min Max 60Hz 60Hz Volume L h One room 2 8 Sanita 2 82 1 81 3 27 850 390 1020 45 4 1 0 5 Operation 3 2 3 21 1 85 3 75 1000 390 1230 5 2 4 7 0 6 CU 2S18NBU 1 2 8 2 8 4 89 2 09 5 86 1450 390 1920 7 6 6 9 0 5 0 5 Two room 38432 Cooling 489 210 586 1450 390 1870 76 6 9 0 5 0 6 Operation 3 2 3 2 4 89 2 10 5 86 1450 390 1840 7 6 6 9 0 6 0 6 Indoor an combination isa W EUM ona MENS Operation Class KW Rating Min Max Rating Min Max 60Hz 60Hz Volume Pt h One room 2 8 s 9600 6200 11200 850 390 1020 45 4 1 1 1 Operation 3 2 10900 6300 12800 1000 390 1230 5 2 4 7 1 3 CU 2818NBU 1 7100 20000 390 1920 TWO TCR Cooling 7200 20000 390 1870 Operation 7200 20000 390 1840 e Specifications are subject to change without notice for further improvement 3 Dimensions Space necessary for lt Top View gt installation Anchor Bolt Pitch E wumAP VPlo H 14 3 16 x 24 1 8 8 15 lt Side View gt lt Front View gt 34 15 32 4 Refrigeration Cycle Diagram STRAINER SENSOR V SWAY VALVE VIN VS HEAT GAS SIDE STRAINER EXPANSION EX
23. N the pipes Be sure to insulate both the gas side and liquid side pipes If the pipes are not adequately insulated condensation or water leakages may occur Gas side pipes higher Liquid side pipes Material shall withstand 248 F or Cutting and Flaring the Piping 1 Please cut using pipe cutter and then remove the burrs 2 Remove the burrs by using reamer If burrs is not removed gas leakage may be caused Turn the piping end down to avoid the metal powder entering the pipe 3 Please make flare after inserting the flare nut onto the copper pipes improper flaring B Pipe Bar 0 5 256 Reamer 1 Y f 1 PA Copper pipe Inclined Surface Cracked Uneven damaged thickness Point down Clamp handle Red arrow mark When properly flared the internal surface 1 To cut 2 To remove burrs 3 To flare of the flare will evenly shine and be of even thickness Since the flare part comes into contact with the connections carefully check the flare finish 19 11 Operation Control 11 1 Cooling Operation 11 1 1 Outdoor fan control e When cooling operation is enabled based on outdoor ambient temperature fan motor control will be adjusted according to figure below RPM free 59 F RPM controlled 8 6 Stopped OD temp 11 1 2 Powerful Operation 1 e During cooling operation this control is to concentrate outdoor unit capability to the powerful operation enabled indoor unit by
24. OR BRACKET 1 CWD541127 5 CONDENSER COMPLETE 1 CWB32C2925 6 FAN MOTOR 1 EHDS80CAC 8 PROPELLER FAN 1 CWH00K1006 9 NUT PROPELLER FAN 1 CWH561038J 10 COMPRESSOR 1 5KD184XAB21 11 PACKING 3 CWB81043 12 ANTI VIBRATION BUSHING 3 CWH50055 13 NUT COMPRESSOR 3 CWH561049 16 ACUMULATOR 1 CWB131050 17 3 WAY VALVE LIQUID 2 CWBO011601 18 3 WAY VALVE GAS 2 CWB011602 19 HOLDER COUPLING 1 CWH351170 20 STRAINER 1 CWB111062 21 STRAINER 2 CWB111063 22 EXPANSION VALVE 2 CWB051029 23 4 WAYS VALVE 1 CWB001057 24 DISCHARGE MUFFLER 1 CWB121042 25 PRESSURE SWITCH 1 CWA101007 26 UNION NUT 4 CWT251030 27 UNION NUT 4 CWT251031 28 SOUND PROOF MATERIAL 1 CWG302246 29 SOUND PROOF MATERIAL 1 CWG302520 30 SOUND PROOF MATERIAL 1 CWG302521 31 SOUND PROOF MATERIAL 1 CWG302522 32 SENSOR COMPLETE 1 CWA50C2722 34 V COIL COMPLETE 1 CWA43C2381 35 V COIL COMPLETE 1 CWA43C2382 39 SENSOR COMPLETE 1 CWA50C2710 40 SENSOR COMPLETE 1 CWA50C2691 42 HOLDER SENSOR 1 CWH32074 43 ELECTRONIC CONTROLLER MAIN 1 CWAT73C6132R 44 ELECTRONIC CONT NOISE FILTER 1 CWA745975 47 REACTOR 1 G0C403J00001 48 TERMINAL BOARD ASS Y 1 CWA28K1195 49 TERMINAL BOARD ASS Y 2 CWA28K1196 50 CONTROL BOARD COVER TOP 1 CWH131333 52 CABINET TOP PLATE 1 CWE031131A 53 CONTROL BOARD COVER COMPLETE 1 CWH13C1209 54 CABINET FRONT PLATE CO 1 CWEO06K1071 55 CABINET SIDE PLATE L 1 CWE041489A 56 CABINET SIDE PLATE 1 CWE041499A 57 WIRE NET 1 CWD041128A 58 HANDLE 1 CWE1610
25. Order PHAAM1111121A1 Service Manual Air Conditioner Outdoor Unit CU 2S18NBU 1 Please file and use this manual together with the service manual for Model No CS S9NKUW 1 CS S12NKUW 1 Order No PHAAM1111084C1 AN WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public It does not contain warnings or cautions to advise non technical individuals of potential dangers in attempting to service a product Products powered by electricity should be serviced or repaired only by experienced professional technicians Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death A PRECAUTION OF LOW TEMPERATURE In order to avoid frostbite be assured of no refrigerant leakage during the installation or repairing of refrigerantion circuit TABLE OF CONTENTS o OP LN c Safety 3 9 Installation Information 14 Specification 2anaaaannaaaannnnnnnnnnnunnnnnnunnnnnunnnnnnna 5 9 1 Check Points ieee ieee 14 Dimensions aaaaaaannnannnnnnnnnnnnnnnnnunnnnnnnununununununununa 7 10 Installation Instruction 15 Refrigeration Cycle 8 10 4 SELECT THE BEST LOCATION
26. RCD Otherwise it may cause electrical shock and fire in case equipment breakdown or insulation breakdown Do not use joint cable for indoor outdoor connection cable Use specified indoor outdoor connection cable refer to Installation 10 Instructions CONNECT THE CABLE TO THE INDOOR UNIT and connect tightly for indoor outdoor connection Clamp the cable so that no external force will be acted on the terminal If connection or fixing is not perfect it will cause heat up or fire at the connection 11 Wire routing must be properly arranged so that control board cover is fixed properly lf control board cover is not fixed perfectly it will cause heat up or fire at the connection point of terminal fire or electrical shock 12 When install or relocate air conditioner do not let any substance other than the specified refrigerant eg air etc mix into refrigerant cycle piping Mixing of air etc will cause abnormal high pressure in refrigeration cycle and result in explosion injury etc 13 Do not install outdoor unit near handrail of veranda When installing air conditioner unit at veranda of high rise building child may climb up to outdoor unit and cross over the handrail and causing accident 14 This equipment must be properly earthed Earth line must not be connected to gas pipe water pipe earth of lightning rod and telephone Otherwise it may cause electrical shock in case equipment breakdown or insulation breakdown 15 Keep away fr
27. W2 OPERATION TEST SW3 WIRING CHECK Wiring automatic correct example Terminal block 24 mw From Room B to the living room From Room A to the bedroom y Wiring error check LED lighting sequence after a wiring correction Order of LED flashing 3 gt 2 For two rooms LED 4 and 5 are not illuminated after wiring operation complete If the outdoor air temperature is less than 41 F or unit has abnormality wiring operation will not start After wiring check operation is complete LED indication will illuminated until normal operation starts Follow the product diagnosis procedure Check the diagnostic label at the control board cover When LED 1 only illuminate indicates that outdoor unit is operating normally 13 4 Power Save Mode e Power Save Mode can be enabled by pushing POWER SAVE switch SW4 to ON before power supply ON e When Power Save Mode is ON the unit can be operate at lower running current where the breaker capacity not achieve the requirement 13 5 Mode priority function e Mode priority function can be enabled by pushing MODE PRIORITY switch SW5 to ON before power supply ON e When Mode Priority Function is ON the mode priority is given to higher capacity indoor units 25 14 Troubleshooting Guide 14 1 Self Diagnosis Function The display screen of wireless remote control unit and the self diagnosis LEDs green on the outdoor p
28. ature rises to 176 F outdoor fan speed will be increased o When the IPM temperature rises to 203 F compressor operation will stop immediately o Compressor operation restarts when temperature decreases to 194 F o If IPM temperature detected less than 22 F IPM is judged as open circuit F96 is indicated DC Peak Current Control o When IPM DC current exceeds set value of 30 0 3 0 A the compressor will stop o If the DC peak current detected within 30 seconds after operation starts compressor will restart after 1 minute o If the DC peak current detected 30 seconds or more after operation starts compressor will restart after 2 minute o Within 30 seconds after compressor restarts if the DC peak current is exceeded set value continuously for 7 times all indoor and outdoor relays will be cut off F99 is indicated Error reset can be done by power supply reset 22 12 10 Compressor Protection Control Gas leak detection control 1 Control start conditions For 5 minutes the compressor continuously operates and total current is low o During Cooling or Soft Dry operation Indoor intake temperature indoor piping temperature is below 39 2 F Control content o Compressor stops and restart after 3 minutes o Ifthe conditions above happen 4 times within 60 minutes the unit will stop operation F91 is indicated 12 11Compressor Protection Control Gas leak detection control 2 This control detect gas
29. elting point than standard solder typically the melting point is 50 F 70 F 30 40 C higher Please use 6 ahigh temperature solder iron In case of the soldering iron with temperature control please set it to 700 20 F 370 10 Pb free solder will tend to splash when heated too high about 1100 F 600 C Power supply connection to the air conditioner Power supply cord shall be UL listed or CSA approved 4 conductors with minimum AWG12 wires 7 Power supply point should be in an easily accessible place for power disconnection in case of emergency In some countries permanent connection of this air conditioner to the power supply is prohibited Fix power supply connection to a circuit breaker for the permanent connection Use NRTL approved fuse or circuit breaker rating refers to name plate for the permanent connection 8 Do not release refrigerant during piping work for installation servicing reinstallation and during repairing a refrigerant parts Take Q of the liquid refrigerant it may cause frostbite 9 Installation or servicing work It may need two people to carry out the installation or servicing work 10 Do notinstall this appliance in a laundry room or other location where water may drip from the ceiling etc Q 11 Do not sit or step on the unit you may fall down accidentally Q 12 Do not touch the sharp aluminum fin sharp parts may cause injury Q 2 Specification Model Outdoor Unit CU
30. ength listed above additionally charge with 0 2 oz of refrigerant R410A for each additional feet of piping 10 1 2 Outdoor Unit Installation Diagram Installation parts you should purchase X It is advisable to avoid more than 2 blockage directions For better ventilation amp multiple outdoor installation please consult authorized dealer specialist Power supply cord X Conduit Connecting cable X Conduit Additional drain hose X 1 4 Liquid side piping X 3 8 Gas side piping X This illustration is for explanation purposes only e Note Respective indoor unit installation procedure shall refer to instruction manual provided in the indoor unit packaging Outdoor Unit Allowable piping length CU 2818 Allowable piping length of each indoor unit min max 9 8 ft 82 0 ft Allowable total piping length of all indoor unit 164 0 ft or less Outdoor unit located on upper side 8 49 2 ft or less Height difference between indoor and outdoor unit Outdoor unit located otherwise 24 6 ft less Outdoor unit located on upper side 24 6 ft or less Height difference between indoor unit Outdoor unit located otherwise 49 2 ft or less Outdoor unit located on upper side Outdoor unit Outdoor unit located Indoor unit otherwise Indoor unit Indoor unit Outdoor unit Outdoo
31. h pressure switch is opened and restart after high pressure switch closed If this condition happen 4 times within 30 minutes F94 is indicated o After 30 minutes counter is reset if this condition does not happen for 4 times Control 1 stop conditions o Power supply reset o Reset by using remote control 23 13 13 1 Servicing Mode Pump Down Operation e Operate the pump down according to the following procedures 1 2 13 2 Confirm the valve on the liquid side and gas side is open Press PUMP DOWN switch SW1 on the display printed circuit board for more than 5 seconds Pump down cooling operation is performed for 15 minutes Set the liquid side 3 way valve to close position and wait until the pressure gauge indicates 1 45 PSI Immediately set the gas side valve to close position and then press the PUMP DOWN switch 5 1 to stop the pump down operation Note Pump down operation will stop automatically after 15 minutes if PUMP DOWN switch SW1 is not pressed again Pump down operation cannot be restarted until 3 minutes after compressor is stopped Test Operation Liquid shut off valve Valve lid LED 213 Message Pump down operation progress M 3 minutes before operation end 8 2 minutes before operation end 1 minute before operation end Pump down operation end O Flashing e Test operation be carried out using OPERATION T
32. k connector lock 30 minutes abnormal e Fan motor lock or 26 block Abnormality Diagnosis or LED LED LED LED LED LED Abnormalit Protection display Protection 6 5 4 3 2 1 Judgment Operation none 1 control Indoor high Check indoor heat Indoor high exchanger H98 pressure Kk e Air filter dirty protection Heating e Air circulation short circuit racor Check indoor heat operating unit Indoor freeze exchanger H99 protection e Air filter dirty protection Cooling e Air circulation short circuit 4 way valve 4 times 4 way valve e 4 way valve F11 Switching O happen within Switching e Lead wire and abnormality 30 minutes abnormal connector Check indoor outdoor Wrong wiring and St ese MIS Indoor standby 3 times E nee e Indoor heat F17 units freezing happen within exchanger sensor abnormality 40 minutes heat exchanger lead wire and sensor open circuit connector e Expansion valve lead wire and connector Power factor 3 4 times Power factor F90 O happen within correction circuit 1 10 minutes abnormal protection Refrigeration 2 times e Insufficient F91 cycle happen within 2 refrigerant valve abnormality 20 minutes y close Compressor 4 times
33. leakage condition to prevent compressor damage Control start condition o All connected indoor units capability supply ON o Compressor ON with maximum frequency o Compressor discharge temperature high Control content o Compressor OFF during this control F91 is memorized in EEPROM o If the above conditions happen 2 times within 60 minutes indoor units Timer LED will blinks F91 is indicated at all indoor units 12 12 Valve close detection control This control detects 3 way valve close condition to prevent damage to refrigerant cycle Start conditions o connected indoor units if Indoor intake temperature indoor piping temperature are between 28 4 F and 35 6 F continuously for 5 minutes after compressor ON at first cooling operation o first cooling operation is defined as cooling operation is ON for less than 8 minutes after new installation or after pump down Control content o During this control compressor stop indoor units Timer LED will blink F91 is indicated at indoor units Error reset can be done by power supply reset or reset by using remote control 12 13 Compressor discharge high pressure protection control This control protect by using high pressure switch during operation Start conditions o High pressure switch is activated from normally close to open when outdoor operation mode is cooling during compressor running Control 1 content o Compressor stop when hig
34. o 7 5 10 3 2 Gas Leak Checking Connecting the Piping to Outdoor Unit Do not overtighten over tightening may cause gas leakage Piping size 1 4 0 02 ft 3 8 0 03 ft 1 2 0 04 ft 5 8 0 05 ft 3 4 0 06 ft Torque 18 Nem 13 3 ft 42 Nem 31 0 Ibf ft 55 Nem 40 6 Ibf ft 65 Nem 47 9 Ibf ft 100 Nem 73 8 Ibf ft Flare Nut Connection Pipe Female side Applicable to Liquid and Gas side of Torque Wrench for Flare Nut CS S9 CS S12 d Flare Nut Ec Connection Pipe Male side 2 Torque Wrench for Flare Nut Pressure test to system to 400 PSIG with dry nitrogen in stages Thoroughly leak check the system If the pressure holds release the nitrogen and proceed to section 10 4 17 10 4 EVACUATION OF THE EQUIPMENT WHEN INSTALLING AN AIR CONDITIONER BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND PIPES in the following procedure I Outdoor unit 1 Connect a charging hose with a push pin to the Indoor Unit Low side of a charging set and the service port of the gas side 3 way valve 2 Connect the micron gauge between vacuum pump and service port of outdoor units 3 Turn on the power switch of the vacuum pump and make sure that connect digital micron gauge and to pull down to a value of 500 microns Indoor Unit 4 To make sure micron gauge a value 500 microns and clo
35. om small children the thin film may cling to nose and mouth and prevent breathing Q 16 Do not use unspecified cord modified cord joint cord or extension cord for power supply cord Do not share the single outlet with other electrical appliances Poor contact poor insulation or over current will cause electrical shock or fire 17 Tighten the flare nut with torque wrench according to specified method If the flare nut is over tightened after a long period the Q flare may break and cause refrigerant gas leakage For R410A models when connecting the piping do not use any existing R22 pipes and flare nuts Using such same may cause abnormally high pressure in the refrigeration cycle piping and possibly result in explosion and injury Use only R410A materials 18 Thickness of copper pipes used with R410A must be more than 0 8mm 1 32 Never use copper pipes thinner than 0 8mm Q 1 32 It is desirable that the amount of residual oil is less than 40 mg 10m 0 0008 oz ft During installation install the refrigerant piping properly before run the compressor Operation of compressor without fixing refrigeration 19 piping and valves at opened condition will cause suck in of air abnormal high pressure in refrigeration cycle and result in explosion injury etc A WARNING During pump down operation stop the compressor before remove the refrigeration piping Removal of refrigeration piping while
36. osen the 4 fan motor mounting screws then remove the fan motor 30 16 Technical Data 16 1 Operation Characteristics 16 1 1 CS S9NKUW 1 CU 2S18NBU 1 Cooling Characteristic Room temperature 81 F DBT 66 F WBT Operation condition High fan speed Piping length 24 6ft Compressor Freq Fc 208V 230V Current A 60 8 66 8 728 788 848 90 8 96 8 102 8 108 8 114 8 Outdoor Temperature F 153 5 148 5 143 5 138 5 133 5 60 8 8 728 788 848 90 8 96 8 102 8 108 8 114 8 Outdoor Temperature F Gas Side Piping Pressure PSI 208V 230V 3 835 3 535 3235 gt 3 2 935 2 635 2 335 60 8 1 78 8 84 8 90 8 96 8 102 8 108 8 114 8 Outdoor Temperature F E 5 5 608 668 728 788 848 908 968 102 8 108 8 114 8 Outdoor Temperature F 31 Piping Length Characteristic o Room temperature Operation condition Outdoor temperature 81 F DBT 66 F WBT High fan speed 95 F DBT Compressor Freq Fc 9 208V 230V 4 00 3 90 3 80 3 70 3 60 Current A 3 50 3 40 39 0 Piping Length ft 49 0 59 0 9 208V 230V 141 5 140 5 139 5 138 5 137 5 136 5 9 0 19 0 Gas Side Piping Pressure PSI 290 390 49 0 59 0 Piping Length ft 69 0 79 0 890 9 208V 230V 3 045 2
37. r unit Outdoor Unit Installation Guidelines e Where a wall or other obstacle is in the path of outdoor unit s intake or exhaust airflow follow the installation guidelines below e For any of the below installation patterns the wall height on the exhaust side should be 47 1 4 or less Wall facing one side Walls facing two side Walls facing three side More than 3 15 16 More than 39 3 8 More than 3 15 16 More than 39 3 8 More than 3 15 16 47 1 4 or less More than 3 15 16 More than 39 3 8 More than 11 13 16 Side view Top view Top view Unit inch 16 10 2 INSTALL THE OUTDOOR UNIT After selecting the best location start installation to Indoor Outdoor Unit Installation Diagram 1 Fix the unit on concrete or rigid frame firmly and horizontally with bolt nut 213 32 2 When installing on a roof please consider strong winds and earthquakes Please fasten the installation stand firmly with bolt or nails 10 3 CONNECT THE PIPING Model A B D CU 2818 24 1 8 5 5 32 5 8 14 3 16 e Remove the control board cover resin from the outdoor unit by loosening three screws 10 3 1 Decide piping length and then cut by using pipe cutter Remove burrs from cut edge Make flare after inserting the flare nut locate at valve onto the copper pipe Align center of piping to valves and then tighten with torque wrench to the specified torque as stated in the table D K IIl
38. rinted circuit board in the outdoor unit can be used to identify the location of the problem Refer to the table below to identify and solve the cause of the problem and then re start the air conditioner system If the problem is solved and operation returns to normal LED 1 illuminates and others LED are off Abnormality Diagnosis or LED LED LED LED LED LED Abnormality Protection display Protection 6 5 4 3 2 1 Judgment Operation Problem Check location control Indoor fan only e Indoor outdoor Indoor outdoor After ee can Indoor outdoor Wire terminal H11 abnormal O operation for communication e Indoor outdoor communication 1 minute entering into not establish PCB force cooling Indoor outdoor operation connection wire Me nets Indoor outdoor connection wire Indoor unit MMAM indoor outdoor H12 capacity 905 after 2 limit or less than PCB power supply minimum limit or SOM unmatched e Specification and number of Pai indoor unit less combination table than two in catalogue Compressor Compressor e Compressor H15 temperature Continuous temperature temperature 2 sensor for 5s sensor open or sensor lead wire abnormality short circuit and connector Outdoor Current current transformer e Outdoor PCB H16 transformer faulty or faulty or CT compressor compressor faulty abnormality faulty Outdoor air Outdoor air e Outdoor air H27 temperature
39. se the low side valve of the charging set and turn off the vacuum pump 5 Disconnect the vacuum pump house from the service port of the 3 way valve 6 Tighten the service port caps of gas side 3 way valve at a torque of 13 3 Ibf ft with a torque wrench 7 Remove the valve caps of both of the 2 way valve and 3 way valve Position both of the valves to Open using a hexagonal wrench 5 32 8 Mount valve caps onto the 2 way valve and 3 way valve e Be sure to check for gas leakage A CAUTION e f micron gauge value does not descend 500 microns take the following measures o Ifthe leak stops when the piping connections are tightened further continue working from step o If the leak does not stop when the connections are retightened repair location of leak o Do not release refrigerant during piping work for installation and reinstallation o Take care when handling the liquid refrigerant it may cause frostbite 10 5 CONNECT THE CABLE TO THE OUTDOOR UNIT 1 Remove Control Board Cover Metal by loosening 2 screws 2 Remove Valve Cover Metal by loosening 2 Screws 3 Remove Plugs 4 Fix the conduit connectors to the knock out holes with lock nuts then secure them 5 Connecting wire between indoor unit and outdoor unit should be UL listed or CSA approved 4 conductor wires minimum AWG16 in accordance with local electric codes 6 Wire Connection to the power supply 208 230V Screws 60Hz through
40. temperature e When indoor unit request capability OFF due to freeze condition immediately the capability supply to targeted indoor unit stops 12 2 Dew Prevention control Cool e When received dew prevention signal from indoor unit the compressor frequency changes according to indoor intake temperature and indoor heat exchanger temperature 12 3 Electronic Parts Temperature Rise Protection 1 Cool e This control prevents electronic parts temperature rise during cooling overload condition e Start conditions o Outdoor ambient temperature is at protection region as shown in figure below Protection Region 89 6 F Normal Region 86 F OD temp o Outdoor unit total current is above 5 5A e Control content o Outdoor fan speed is adjusted accordingly e Control stop condition o When outdoor ambient temperature is back to normal region e During this control outdoor fan speed does not reduce for Quiet operation 12 4 Electronic Parts Temperature Rise Protection 2 Cool e This control prevents electronic parts temperature rise during cooling dry operation e Start conditions o Total current is at protection region as shown in figure below Protection Region 4 7A 3 3A Total current e Control content o Outdoor fan speed is adjusted accordingly e Control stop condition o When total current is back to normal region e During this control outdoor fan speed does not reduce for Quiet operation
41. temporary stop the capability supply to low load demand indoor units e Operation start condition o Powerful operation ON for targeted indoor unit e Operation content o If other indoor units where Powerful operation are OFF achieve setting temperature continuously for 1 minutes after received powerful command from indoor unit then capability supply to other indoor units are stopped for minimum 3 minutes Capability supply stop period follows powerful operation period e Operation stops when comply either one of the following conditions o When other indoor units where Powerful operation are OFF is lower than setting temperature o When the powerful operation is OFF for all indoor units o When Quiet operation received from 1 indoor unit o When protection control starts 11 1 3 Powerful Operation 2 e During cooling operation this control is to provide fast cooling operation compare to normal operation e Operation start if all condition below are complied o Powerful operation ON for indoor unit e Operation content o Outdoor fan speed will adjust automatically o Compressor frequency will adjust automatically e Operation stop when comply either one of the follow conditions o When the powerful operation is OFF for all indoor units 20 12 Protection Control 12 1 Freeze Prevention control Cool e When received freeze prevention signal from indoor unit the compressor frequency changes according to indoor heat exchanger
42. um 89 6 73 4 Minimum 60 8 51 8 Maximum 109 4 78 8 Minimum 60 8 51 8 Indoor Operation Range Cooling Outdoor Operation Range Cooling Note e Specifications are subject to change without notice for further improvement e Multi split combination possibility o A single outdoor unit enables air conditioning of up to two separate rooms for CU 2S18NBU 1 Outdoor Unit CU 2S18NBU 1 2 8 kW CS S9NKUW 1 3 2 kW CS S12NKUW 1 Capacity range of connectable indoor units From 5 6 kW to 6 4 kW 1 room maximum pipe length m ft 25 82 0 Allowable elevation m ft 15 49 2 Total allowable pipe length m ft 50 164 0 Total pipe length for maximum chargeless length m ft 20 65 6 Piping Length Additional gas amount over chargeless length g m oz ft 20 0 2 Note e Available Remarks for CU 2818NBU 1 1 At least two indoor units must be connected 2 total nominal cooling capacity of indoor unit that will be connected to outdoor unit must be within connectable capacity range of indoor unit as shown in the table above Example The indoor units combination below is possible to connect to CU 2818NBU 1 Total nominal capacity of indoor units is between 5 6 kW to 6 4 kW 1 Two CS S9NKUW 1 only Total nominal cooling capacity is 5 6 kW 2 One CS S9NKUW 1 and one CS S12NKUW 1 Total nominal cooling capacity is 6 0 KW Snos Uni
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