Panasonic CS-V28EKE CU-V28EKE Service Manual Download Page 38 | Manualshive

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13 Troubleshooting Guide

13.1. Refrigeration Cycle System

In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table on the right.

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Summary of Contents for CS-V28EKE CU-V28EKE

Page 1: ...Diagram 11 7 Block Diagram 12 8 Wiring Connection Diagram 13 9 Printed Circuit Board 14 9 1 Indoor Unit 14 9 2 Indicator And Receiver 16 10 Installation Instruction 17 10 1 Select The Best Location 17 10 2 Indoor Outdoor Unit Installation Diagram 17 10 3 Indoor Unit 18 10 4 Outdoor Unit 22 11 Operation And Control 25 11 1 Cooling Operation 25 11 2 Soft Dry Operation 26 11 3 Automatic Operation 27 ...

Page 2: ...ition Of The Air Conditioner And Pressure And Electric Current 39 13 3 Diagnosis Methods Of A Malfunction Of A Compressor And 4 way Valve 39 14 Disassembly and Assembly Instructions 40 14 1 Indoor Electronic Controllers Cross Flow Fan and Indoor Fan Motor Removal Procedures 40 15 Technical Data 43 15 1 Thermostat Characteristics 43 15 2 Sensible Capacity Chart 44 15 3 Operation Characteristics 45 ...

Page 3: ...rm 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 5 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 ...

Page 4: ...g one of the following methods Power supply point shall be the place where there is ease for access for the power disconnection in case of emergency In some countries permanent connection of this room air conditioner to the power supply is prohibited 1 Power supply connection to the receptacle using a power plug Use an approved power plug with earth pin for the connection to the socket 2 Power sup...

Page 5: ...ort inch G Half Union 5 8 G 3 way valve 5 8 Flare Piping inch L Half Union 1 4 L 2 way valve 1 4 Pipe Size inch G gas side 5 8 G gas side 5 8 Flare Piping inch L liquid side 1 4 L liquid side 1 4 Drain Inner diameter mm 16 Hose Length mm 650 Power Cord Length m Number of core wire Dimensions Height inch mm 13 13 32 340 29 17 32 750 Width inch mm 45 9 32 1 150 34 7 16 875 Depth inch mm 10 1 4 260 1...

Page 6: ...8 17 Size W x H x L mm 44 355 6 880 850 5 870 5 714 0 25 4 Refrigerant Control Device Capillary Tube Refrigerant Oil cm3 FV50S 1 130 Refrigerant R 410A g oz 1 900 67 1 Thermostat Electronic Control Mechanical Control Protection Device Inner Protector Capillary Tube Length mm 830 Flow Rate l min 20 9 Inner Diameter mm 2 0 Air Filter Material P P Style Honeycomb Capacity Control Capillary Tube Compr...

Page 7: ...rt in the air Random auto restart after power failure for safety restart operation Gas leakage detection Prevent Compressor reverse cycle Inner protector to protect Compressor Noise prevention during soft dry operation Dew prevention control Cooling Soft Dry Operation Improvement Quiet mode to provide quiet operation Powerful mode to reach the desired room temperature quickly Ionizer control for g...

Page 8: ...8 4 Location of Controls and Components Indoor Unit Outdoor Unit Remote Control ...

Page 9: ...9 5 Dimensions 5 1 Indoor Unit Remote Control ...

Page 10: ...10 5 2 Outdoor Unit ...

Page 11: ...11 6 Refrigeration Cycle Diagram ...

Page 12: ...12 7 Block Diagram ...

Page 13: ...13 8 Wiring Connection Diagram ...

Page 14: ...14 9 Printed Circuit Board 9 1 Indoor Unit BOTTOM VIEW ...

Page 15: ...15 TOP VIEW ...

Page 16: ...16 9 2 Indicator And Receiver BOTTOM VIEW TOP VIEW ...

Page 17: ...s built over the unit to prevent direct sunlight or rain be careful that heat radiation from the condenser is not obstructed There should not be any animal or plant which could be affected by hot air discharged Keep the spaces indicated by arrows from wall ceiling fence or other obstacles Do not place any obstacles which may cause a short circuit of the discharged air If piping length is over 7 5 ...

Page 18: ... the hole Another method is by putting measuring tape at position as shown in the diagram above The hole centre is obtained by measuring the distance namely 140 mm and 155 mm for left and right hole respectively Drill the piping hole at either the right or the left and the hole should be slightly slanted to the outdoor side 10 3 2 TO DRILL A HOLE IN THE WALL AND INSTALL A SLEEVE OF PIPING 1 Insert...

Page 19: ...iping Liquid side piping need to pull out to joint tube ass y 3 Set the piping direction For bottom piping need to perform cutting and flaring process 4 Use 2 spanner to tighten the nut tighten torque 65 N m 5 Check gas leakage at joint area 6 Cover the open tubing with the foam and bind it by band 7 Close back the chassis back piece ...

Page 20: ...20 This can be used for left rear piping and left bottom piping also ...

Page 21: ...loroprene sheathed 4 1 5 mm2 flexible cord type designation 245 IEC 57 or heavier cord Ensure the color of wires of outdoor unit and the terminal Nos are the same to the indoor s respectively Secure the cable onto the control board with the holder clamper Earth lead wire shall be longer than the other lead wires as shown in the figure for the electrical safety in case of the slipping out of the co...

Page 22: ...ufficiently tighten the flare nut with fingers Further tighten the flare nut with torque wrench in specified torque as stated in the table Connecting The Piping To Outdoor Unit 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 w...

Page 23: ... not move after approximately five minutes Note BE SURE TO FOLLOW THIS PROCEDURE IN ORDER TO AVOID REFRIGERANT GAS LEAKAGE 5 Disconnect the charging hose from the vacuum pump and from the service port of the 3 way valve 6 Tighten the service port caps of the 3 way valve at a torque of 18 N m with a torque wrench 7 Remove the valve caps of both of the 2 way valve and 3 way valve Position both of th...

Page 24: ...cord 3 Secure the cable onto the control board with the holder clamper 4 Cable connection to the power supply 220 240V 50Hz through knife switch Disconnecting means Connect the approved polychloroprene sheathed power supply cable 3 4 0 mm2 V28EK type designation 245 IEC 57 or heavier cord to the terminal board and connect the other end of the cable to knife switch Disconnecting means Note Knife sw...

Page 25: ...the room temperature reaches the setting temperature set on the remote control The remote control setting temperature which takes the reading of intake air temperature sensor can be adjusted from 16 C to 30 C During cooling operation the compressor will stop running and restart as shown in below figure 11 1 1 Cooling Operation Time Diagram ...

Page 26: ...egins Soft Dry will be switched ON for a maximum 10 minutes then Soft Dry operation will be turned OFF for a minimum 6 minutes After that the Soft Dry operation will be ON and OFF based on the setting temperature as shown in below figure However after 3 minutes of compressor off during Soft Dry OFF within 6 minutes Soft Dry restart control the indoor unit will start to operate at normal Cooling mo...

Page 27: ...y Operation 11 4 1 Restart Control Time Delay Safety Control When the thermo off temperature temperature which compressor stops to operate is reached during Cooling operation the compressor stops for 3 minutes minimum before resume operation Soft Dry operation the compressor stops for 6 minutes minimum before resume operation If the operation is stopped by the remote control the compressor will no...

Page 28: ...too short 11 4 5 Compressor Reverse Rotation Protection Control If the compressor is operating continuously for 5 minutes or longer and the temperature difference between intake air and indoor heat exchanger is 2 5 C or less for continuous 2 minutes compressor will stop and restart automatically Time Delay Safety Control is activated before the compressor restart T Intake air temperature Indoor he...

Page 29: ...anged Dew prevention is control by 1 Lo fan speed Lo fan is changed to Lo fan 2 QLo fan speed 11 5 Indoor Fan Speed Control Indoor Fan Speed can be set using remote control 11 5 1 Fan Speed Rotation Chart Speed CS V28EKE Cool Dry S Hi 1760 Hi 1720 Me 1590 Lo 1500 Lo 1410 Lo 1200 S Lo 960 Q Hi 1620 Q Me 1480 Q Lo 1310 ...

Page 30: ...erate indoor fan will be switched to Hi fan speed from Lo after 70 seconds from the start of compressor This cause the room temperature to achieve the setting temperature quickly 4 During compressor stop indoor fan will operate at Lo for the beginning 20 seconds to prevent higher volume of refrigerant in liquid form returning to the compressor 5 After the compressor at turn off condition for 3 min...

Page 31: ...ooling and Soft Dry Operation condition When the vertical airflow direction is set to Auto using the remote control the louver swings up and down as shown in the diagram When stop operation using the remote control the discharge vent is reset and stop at the closing position During Cooling operation or Soft Dry operation indoor fan motor may stop to rotate at certain periods At that condition the ...

Page 32: ...owerful Operation The Powerful operation is to achieve the setting temperature quickly Cooling and Soft Dry Operation condition When Powerful operation is set the setting temperature will be automatically decreased 3 C internally against the present set ting temperature Lower temperature limit 16 C This operation automatically will be running under SHi Fan Speed Cooling Vertical Airflow Direction ...

Page 33: ... Fan Speed Quiet operation stops when Quiet Powerful button is pressed again Stopped by OFF ON operation button Timer OFF activates 11 11 Ionizer Operation The Ionizer operation is to provide fresh air effect to user by producing minus ion in discharged air 11 11 1 Operation Control ...

Page 34: ... g When the Ionizer circuit feedback process error occur for 24 times about 11hr 30 min Ionizer and Fan operations will turn off with ION LED blinks continuously For details please refer to Ionizer Error detection control 2 Operation mode Ionizer operation a When air conditioner unit is at ON condition and ION operation button at the remote control is pressed the Ionizer operation will turn on ION...

Page 35: ...ghtly before the set time so that the room will reach nearly to the set temperature by the set time For Cooling and Soft Dry operation the operation will start 15 minutes before the set time For Automatic operation the indoor fan will operate at SLo speed for 20 seconds 30 minutes before the set time to detect the intake air temperature to determine the operation mode The operation indication lamp...

Page 36: ... OFF ON Button to toggle the remote control sound Short beep Turn ON remote control signal receiving sound Long beep Turn OFF remote control signal receiving sound After Auto OFF ON Button is pressed the 20s counter for various setting mode is restarted 12 1 2 Select Remote Control Transmission Code There are 4 types of remote control transmission code could be selected and stored in EEPROM of ind...

Page 37: ...Soft Dry OFF 6 min 36 sec ON 10 min 60 sec Soft Dry 10 min operation Cooling 40 sec 4 sec 70 sec 7 sec Deodorizing Control 20 sec 2 sec 180 sec 18 sec Soft Dry 40 sec 4 sec 360 sec 36 sec Comp Reverse Rotation Detection 5 min 30 sec Comp ON 5 min and above 2 min 0 sec Comp Fan Motor Delay Timer 1 6 sec 0 sec Powerful Mode Operation 15 min 15 sec Random Auto Restart Control 0 62 sec 0 6 2 sec Ion O...

Page 38: ... problems before inspecting the refrigeration cycle Such problems include insufficient insulation problem with the power source malfunction of a compressor and a fan The normal outlet air temperature and pressure of the refrigeration cycle depends on various conditions the standard values for them are shown in the table on the right ...

Page 39: ...kage Clogged capillary tube or Strainer Short circuit in the indoor unit Heat radiation deficiency of the outdoor unit Inefficient compression Nature of fault Symptom Electric current during operation becomes approximately 20 lower than the normal value Insufficient compressing of a compressor The discharge tube of the compressor becomes abnormally hot normally 70 to 90 C The difference between hi...

Page 40: ... Fig 1 Unhook the tabs at the Control Board to remove the Control Board Cover Fig 2 Fig 1 Fig 2 14 1 2 To remove the Electronic Controller Release the 2 screws for the earth wire Fig 3 Release the Terminal 1 BLK and Terminal 3 BRW Fig 3 Release the hooks that hold the Electronic Controller and pull out the Electronic Controller Fig 3 Fig 3 High voltages are generated in the electrical parts area b...

Page 41: ... Release the CN STM2 connector Fig 4 Release the Terminal AC01 WHT Fig 4 Release the CN FM connector Fig 4 Fig 4 14 1 3 To remove the Discharge Grille Pull out the Drain Hose behind the Discharge Grille from outlet to remove the Discharge Grille Fig 5 Fig 5 14 1 4 To remove the Control Board Release the Ionizer by screw Fig 6 Release the 4 screws Control Board Casing Fig 6 Fig 6 ...

Page 42: ... the Fan Motor please adjust the connector location is positioned 45 with Fan Motor before fixing Control Board Casing Fig 7 Remove the Bearing Fig 8 Remove the screws at the left of the Evaporator Fig 8 Push up the Evaporator and pull out the Cross Flow Fan from shaft By then Fan Motor can be taken out Fig 9 Fig 7 Fig 8 Fig 9 ...

Page 43: ...43 15 Technical Data 15 1 Thermostat Characteristics ...

Page 44: ...7 0 C 7 85 5 95 2 25 7 33 5 70 2 42 6 82 5 48 2 59 6 20 5 21 2 80 19 0 C 7 91 2 46 19 5 C 8 61 6 23 2 30 8 05 5 98 2 47 7 49 5 76 2 64 6 81 5 48 2 85 22 0 C 9 39 6 46 2 34 8 77 6 21 2 51 8 16 5 99 2 69 7 42 5 71 2 90 TC Total Cooling Capacity kW Indoor 27 C 19 C SHC Sensible Heat Capacity kW Outdoor 35 C 24 C IP Input Power kW ...

Page 45: ...45 15 3 Operation Characteristics 15 3 1 CS V28EKE CU V28EKE ...

Page 46: ...46 ...

Page 47: ...16 Exploded View and Replacement Parts List 16 1 CS V28EKE Note The above exploded view is for the purpose of parts disassembly and replacement The non numbered parts are not kept as standard service parts ...

Page 48: ...ING MOTOR 1 CWA67C6219 23 ELECTRONIC CONTROLLER MAIN 1 CWA744290 O 24 INDICATOR RECEIVER COMPLETE 1 CWE39C1156 O 25 INDICATOR HOLDER 1 CWD932633 26 INDICATOR HOLDER 1 CWD932634 27 SENSOR COMPLETE 1 CWA50C2366 O 28 CONTROL BOARD TOP COVER 1 CWH131265 29 CONTROL BOARD FRONT COVER 1 CWH131266 30 REMOTE CONTROL COMPLETE 1 CWA75C2620 O 31 FRONT GRILLE COMPLETE 1 CWE11C3468 O 32 INTAKE GRILLE COMPLETE 1...

Page 49: ...49 16 2 CU V28EKE Note The above exploded view is for the purpose of parts disassembly and replacement The non numbered parts are not kept as standard service parts ...

Page 50: ...WT024161 17 3 WAY VALVE GAS 1 CWB011363 O 18 TERMINAL COVER 1 CWH171012 19 NUT TERMINAL COVER 1 CWH7080300J 20 CONTROL BOARD CASING 1 CWH102206 21 CAPACITOR FAN MOTOR 1 DS441505NPQB O 22 CAPACITOR COMPRESSOR 1 DS441606CPNA O 23 HOLDER CAPACITOR 1 CWH30071 24 TERMINAL BOARD ASS Y 1 CWA28K1091J 25 CABINET SIDE PLATE L 1 CWE041082A 26 HANDLE 1 CWE161010 27 CABINET SIDE PLATE R 1 CWE041100A 28 HANDLE ...

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