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Service Manual Split Inverter

1. k 3 56 PCB 1 connectors k 1 17 functionality k 1 14 PCB 2 check output voltage k 3 60 connectors k 1 18 functionality k 1 14 PCB 3 connectors k 1 18 PCB 4 connectors k 1 19 PCB fault k 3 31 PCB fault k 3 57 PCB removing k 3 72 PCB k 1 17 PCB
2. k 3 40 E6 k 3 43 F3 k 3 42 H8 k 3 47 H9 k 3 56 J3 k 3 56 J6 k 3 56 L4 k 3 45 L5 k 3 49 P4
3. k 1 11 voltage low k 3 38 maintenance k 5 6 W water escape k 3 4 wide angle flap k 2 16 wiring diagram k 1 15 1 16 diagram k 1 16 layout k 1 13
4. k 2 20 control in heating mode k 2 20 motor abnormality k 3 28 motor k 1 10 motor k 1 11 off delay k 2 20 propeller maintenance k 5 5 removing motor k 3 80 removing motor k 3 82 removing propeller k 3 82 removing rotor k 3 80 rotates when no operation k 3 5 rotor maintenance
5. k 3 87 recommended temperature setting k 4 8 rectifier check k 3 67 refrigerant distribution control k 2 6 refrigerant system check k 3 66 refrigeration circuit functional diagram k 1 10 main parts k 1 10 main parts k 1 11 reluctance DC motor k 2 12 remote controller setting k 4 5 test run k 4 10 removing electrical box k 3 78 electrical parts k 3 84 fan motor k 3 80 fan m
6. k 5 4 speed control k 2 19 speed control k 2 20 speed modes k 2 20 fault code k 3 51 8 k 3 24 3 31 8 k 3 55 3 57 A1 k 3 24 A5 k 3 26 A6 k 3 28 C4 k 3 30 C9 k 3 30 E5
7. k 1 11 additional checks k 3 59 additional control parameters k 2 8 address switch k 4 5 air flow automatic control for cooling k 2 19 automatic control for heating k 2 19 air purifying filter cleaning k 3 69 maintenance k 5 4 replacing k 3 70 working principle k 3 69 ambient temperature thermistor k 2 4 ambient temperature thermistor k 2 4 autoswing k 2 16 ESIE98 07 ii Index 3 1 4 5 General index FTX25GV1NB FTX35GV1NB RX25GV1NB RX35GV1NB C C1R k 1 14 C2R
8. k 3 49 transformer check k 3 62 transformer error k 3 47 transformer k 3 47 ESIE98 07 Index iii 3 4 5 1 General index FTX25GV1NB FTX35GV1NB RX25GV1NB RX35GV1NB D defrost control k 2 5 2 14 start conditions k 2 14 working conditions k 2 14 diffuser k 2 16 dimensions k 1 8 discharge pipe disconnected control k 2 24 temperature abnormality k 3 42 thermistor k 2 4 discharge pressure check
9. k 5 4 maintenance k 5 5 electrical parts removing k 3 84 electrical specifications k 1 7 emergency operation k 3 6 expansion valve control k 2 6 feedback control k 2 25 initialization k 2 24 limits k 2 24 main control k 2 24 motor operated k 1 11 open control k 2 24 sequence k 2 24 ESIE98 07 iv Index 3 1 4 5 General index FTX25GV1NB FTX35GV1NB RX25GV1NB RX35GV1NB F F3 k 3 42 fan control in cooling mode
10. k 1 14 C4 k 3 30 C9 k 3 30 capacitor voltage check k 3 63 casing maintenance k 5 5 check capacitor voltage k 3 63 current transformer k 3 62 discharge pressure k 3 67 Hall IC k 3 60 installation condition k 3 66 installation k 4 4 maintenance k 5 4 P
11. k 5 3 maintenance k 5 3 maintenance k 5 4 mist escape k 3 4 motor efficiency k 2 12 operated expansion valve k 1 11 reluctance k 2 12 rotor structure k 2 13 working principle k 2 13 muffler k 1 10 muffler k 1 11 N night set mode k 2 21 no direct hot air k 3 4 no direct operation start k 3 4 no operation k 3 10 noise level maintenance k 5
12. k 3 56 ESIE98 07 vi Index 3 1 4 5 General index FTX25GV1NB FTX35GV1NB RX25GV1NB RX35GV1NB L L4 k 3 45 L5 k 3 49 layout piping k 1 9 location of thermistors k 2 4 louvre k 2 16 low temperature control k 2 23 low voltage k 3 38 M main circuit overvoltage k 3 38 main PCB layout k 1 20 main PCB layout k 1 17 maintenance general
13. k 1 3 H H8 k 3 47 H9 k 3 56 Hall IC check k 3 60 heat exchanger function k 1 10 function k 1 11 maintenance k 5 4 maintenance k 5 5 thermistor k 2 4 thermistor k 2 4 heat pump drain maintenance k 5 5 heating operation stops
14. k 3 56 U0 k 3 36 U2 k 3 38 U4 k 3 31 3 33 fault indication k 3 8 fault indication k 3 23 fault indication k 3 35 faulty LED indication k 3 23 faulty PCB k 3 24 3 31 faulty PCB k 3 57 faulty power supply k 3 31 feedback control k 2 25 field piping connections
15. k 2 4 2 23 freeze up prevention k 3 26 frequency control k 2 4 2 23 initial setting k 2 9 limits k 2 9 parameters k 2 8 principle k 2 8 functional control k 2 3 description k 2 1 diagram refrigeration circuit k 1 10 diagram k 1 10 diagram k 1 11 functioning abnormal k 3 17 G gas detection fault k 3 36 gas line stop valve k 1 11 general functionality k 2 3 general outline
16. k 2 21 pressure maintenance k 5 6 pre test run checks k 4 3 propeller maintenance k 5 5 ESIE98 07 Index ix 3 4 5 1 General index FTX25GV1NB FTX35GV1NB RX25GV1NB RX35GV1NB R R1T k 2 4 R1T k 2 4 R2T k 2 4 R2T k 2 4 R3T k 2 4 R4T k 2 4 radiation fin temperature rise k 3 45 reactor removing
17. k 3 6 service check k 3 6 service cover closing k 3 71 opening k 3 71 service space k 1 8 setting remote controller k 4 5 signal transmission error k 3 33 sounds k 3 4 3 15 specifications electrical k 1 7 technical k 1 4 SSR1 check k 3 68 SSR1 k 1 14 steam escape k 3 4 step flow k 2 17 swing compressor k 2 11 swing motor removing k 3 76 sw
18. k 4 4 circuit refrigeration k 1 10 cleaning air purifying filter k 3 69 closing service cover k 3 71 commisioning k 4 1 compressor function k 1 11 protection function k 2 23 start up error k 3 43 working principle k 2 11 connectors PCB 1 k 1 17 PCB 2 k 1 18 PCB 3 k 1 18 PCB 4 k 1 19 current maintenance k 5 6 output error
19. k 3 67 discharge temperature control k 2 23 disconnected discharge pipe control k 2 24 disconnected discharge thermistor control k 2 24 drain maintenance k 5 4 maintenance k 5 5 drain pump maintenance k 5 4 maintenance k 5 5 dry mode k 2 21 E E5 k 3 40 E6 k 3 43 electrical box removing k 3 78 temperature rise k 3 53 electrical connections maintenance
20. k 3 4 high pressure control k 3 26 limitation heating k 2 5 2 23 hot start function k 2 21 I input overcurrent error k 3 51 installation check k 4 4 installation condition check k 3 66 insufficient gas detection k 3 36 3 38 insulation maintenance k 5 5 inverter drawing k 2 8 features k 2 9 principle k 2 8 J J3 k 3 56 J6
21. 4 5 Removal of PCB To remove the PCB proceed as follows Step Action Drawing 1 Remove the screw of the service cover 2 Disengage the three catches of the electrical box 3 Remove the box cover 4 Disconnect connector S6 of indoor PCB 1 Do not hold the lead wires of the connector while disconnecting but pull out the connector terminal PCB1 ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 73 3 4 5 1 5 Remove connector S7 on indoor PCB 1 and S1 on indoor PCB 2 6 Pull indoor PCB 1 forward to disconnect the remaining connectors Step Action Drawing Additional Checks and Repair for Troubleshooting ESIE98 07 3 74 Part 3 Troubleshooting 3 1 3 4 5 7 Remove indoor PCB 2 8 Remove the lamp house and indoor PCB 3 9 Disengage hook of lamp house and open it upward Step Action Drawing ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 75 3 4 5 1 10 Remove indoor PCB 4 Be sure to mount the indoor ambient temperature thermistor R1T in the right direction Step Action Drawing Additional Checks and Repair for Troubleshooting ESIE98 07 3 76 Part 3 Troubleshooting 3 1 3 4 5 Removal of swing motor To remove the swing motor proceed as follows Step Action Drawing 1 Open lamp house assembly 2 Re
22. R2T R3T cooling heating 9 5 8 8 1 7 4 3 6 6 4 mm A 2 N Part name Function 1 Compressor The compressor is of the vertical hermetically sealed swing type operated by inverter control 2 Heat exchanger The heat exchanger is of the multi louvre fin type Hi X tubes and coated waffle louvre fins are used 3 Fan motor Double speed motor 4 Four way valve The four way valve is energized during cooling and defrosting 5 Filter The filter collects impurities which may enter the system during installation and also avoids blockage of the capillaries and other fine mechanical parts of the unit 6 Muffler The muffler absorbs the refrigerant noise from the compressor 7 Accumulator The accumulator separates the gas from the liquid in order to pro tect the compressor against liquid pumping 8 Gas line stop valve The gas line stop valves are used as shut off valves in case of a pump down The gas line stop valves are equipped with connec tors to measure the pressure 9 Motor operated expansion valve The opening of the expansion valve is electronically controlled to enable a good performance Piping Layout ESIE98 07 1 12 Part 1 System Outline 3 1 4 5 ESIE98 07 Wiring Layout Part 1 System Outline 1 13 3 1 4 5 1 Part 1 3 Wiring Layout 3 1 What Is in This Chapter Introduction This chapter guides you through the sw
23. k 1 10 filter k 1 11 flap autoswing k 2 16 cooling mode k 2 16 heating mode k 2 16 wide angle k 2 16 forced cooling k 2 15 forced heating k 2 15 forced mode k 2 15 forced operating mode k 2 7 four way valve faulty k 3 18 function k 1 11 operation compensation k 2 26 operation k 2 26 ESIE98 07 Index v 3 4 5 1 General index FTX25GV1NB FTX35GV1NB RX25GV1NB RX35GV1NB structure k 3 18 freeze up prevention
24. k 1 20 peak cut off k 2 23 piping field connections k 1 10 layout k 1 9 piping diagram main parts k 1 10 main parts k 1 11 refrigeration circuit k 1 10 poor cooling or heating effect k 3 12 power supply fault k 3 31 waveform check k 3 62 power transistor check k 3 63 output current check k 3 64 output voltage check k 3 65 pre heat operation
25. Separate panel Reactor cover Wire clip Additional Checks and Repair for Troubleshooting ESIE98 07 3 88 Part 3 Troubleshooting 3 1 3 4 5 3 Lift up the partition plate 4 Remove the screw to take off the reactor cover 5 Remove the screw Step Action Drawing Reactor ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 89 3 4 5 1 6 Slide the reactor to your side to remove it The base plate of the reactor is inserted into the bottom of the frame slit Step Action Drawing Additional Checks and Repair for Troubleshooting ESIE98 07 3 90 Part 3 Troubleshooting 3 1 3 4 5 ESIE98 07 Part 4 Commissioning and Test Run 4 1 4 3 4 5 4 Part 4 Commissioning and Test Run Introduction Commissioning and test run are well known practices in service engineering This part offers a systematic approach to test run checks and test values which will guarantee a high quality installation and operation of the units It is therefore recommended to read the chapters in this part with attention What is in this part This parts contains the following chapters Topic See page 1 Pre Test Run Checks page 4 3 2 Test Run amp Operation Data page 4 7 ESIE98 07 4 2 Part 4 Commissioning and Test Run 3 1 4 5 ESIE98 07 Pre Test Run Checks Part 4
26. k 2 4 heat exchanger k 2 4 heat exchanger k 2 4 location k 2 4 resistance check k 3 61 switch box k 2 4 transmitting receiving circuit k 3 57 TRM1 k 1 14 troubleshooting k 3 1 3 3 U U0 k 3 36 3 38 U2 k 3 38 U4 k 3 31 3 33 V valve expansion k 1 11 gas line stop
27. 07 Wiring Layout Part 1 System Outline 1 19 3 1 4 5 1 Main board PCB 4 The drawing below shows PCB 4 of the indoor units FTX25GV1NB and FTX35GV1NB Refer to Wiring diagram FTX25GV1NB FTX35GV1NB on page 1 15 for more information concerning this PCB board Symbol Description S27 communication connector between PCB 4 and PCB 1 S31 connector for indoor ambient temperature thermistor R1T SW7 emergency operation switch WLU signal receiver SW7 S27 S31 WLU Wiring Layout ESIE98 07 1 20 Part 1 System Outline 3 1 4 5 3 5 Main PCB Layout for Outdoor Units RX25GV1NB and RX35GV1NB Main board PCB 1 The drawing below shows PCB 1 of the outdoor units RX25GV1NB and RX35GV1NB Refer to Wiring diagram RX25GV1NB RX35GV1NB on page 1 16 for more information concerning this PCB board S80 S20 SW1 S2 S92 SW2 LED A LED 1 LED 2 LED 3 LED 4 S1 S50 S90 S40 S30 Symbol Description S1 factory use S2 factory use S20 connector for expansion valve of room Y1E S30 floating connector for compressor motor M1C S40 connector for overload protector Q1L S50 cutting wire for long pipe S80 connector for 4 way valve Y1R S90 connector for outdoor ambient temperature thermistor R1T 1 2 connector for outdoor heat exchanger thermistor R2T 3 4 connector for discharge pipe thermistor R3T 5 6 S92 communication connecto
28. 4 5 1 Procedure The following flow chart shows the troubleshooting procedure Check the discharge pipe thermistor R3T Is the unit equipped with a discharge pipe thermistor R3T Is it disconnected Correct it Check for gas leaks Are there oil stains at the joints of the connection pipes Correct the pipe flare Replace the union joint Are there oil stains on the pipes inside the unit Is the compressor vibration excessive Check and correct the shield of the power transistor TRM1 Replace the damaged pipe Check and correct the pipe contact Replace if damaged Check the current transformer CT1 Refer to 3 62 Is it abnormal Correct it Replace the refrigerant Does the gas shortage occur again Replace the compressor The problem is corrected Yes No Yes Yes Yes Yes Yes No No No No No No End Begin Yes Replace the refrigerant Overview of Fault Indications on Outdoor Units ESIE98 07 3 38 Part 3 Troubleshooting 3 1 3 4 5 4 3 Low Voltage or Main Circuit Overvoltage Fault code U2 LED indication The following table shows the LED indication of the outdoor unit Error method The error is detected by a momentary voltage drop an irregular compressor rotation due to power failure or by overvoltage detection circuit on PCB Error generation The system shuts down when the error is confirmed 16 times The tim
29. 6 Description Hot Cool Cool as in column 2 Hot as in column 1 Temperature of valve body Hot The pilot valve works correctly There is dirt in one bleed hole To resolve 1 Deenergize the solenoid 2 Raise the head pressure 3 Reenergize the solenoid to loosen the dirt 4 If unsuccessful remove the valve and wash it out Check on air before reinstalling If there is still no movement replace the valve add a new strainer to the discharge tube and mount the valve horizontally The piston cup head leaks To resolve 1 Stop the unit 2 After pressure equalization restart with energized solenoid 3 If the valve shifts reattempt with the compressor on If there is no reversal replace the valve Hot Cool Cool as in column 2 Hot as in column 1 Temperature of valve body Temperature of valve body The pilot tubes are clogged To resolve 1 Raise the head pressure 2 Operate the solenoid to free the dirt 3 If there is still no shift replace the valve Hot Cool Cool as in column 2 Hot as in column 1 Hot Hot Both parts of pilot are still open To resolve 1 Raise the head pressure 2 Operate the solenoid to free the partially clogged port 3 If there is still no shift replace the valve Warm Cool Cool as in column 2 Hot as in column 1 Temperature of valve body Warm The compressor is defective Overview of Gene
30. 70 Part 3 Troubleshooting 3 1 3 4 5 Replacing the air purifying filters To replace the air purifying filters proceed as follows Step Action Drawing 1 Open the front grille by lifting the grill by the two tabs at both sides Lift until you hear a click 2 Take out the air purifying filters by releasing the four claws 3 Detach the filter element 4 Attach a new one In a dusty environment it is recommended to replace the filters every three months To order an air filter with frame 2 pieces 1 set refer to number KAF918A41 and an air filter with frame 4 pieces 2 sets refer to number KAF918A42 5 Attach the air purifying filter 6 Put the air filters back 7 Close the front grille at the 3 points indicated by the arrows ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 71 3 4 5 1 To open or close the service cover To open or close the service cover or to change the settings at installation site proceed as follows Step Action Drawing 1 Remove the service cover using a screwdriver 2 Open the service cover 3 Change the settings I Reminder timer is set to off at the factory I Filter sign can be reset In a dusty environment clean the filter once every two weeks to save energy Additional Checks and Repair for Troubleshooting ESIE98 07 3 72 Part 3 Troubleshooting 3 1 3
31. Find the problem refer to Sounds on page 3 4 It can result in a higher noise level Drain Check whether the drain is not blocked Unblock it A blocked drain results in water leakage Drain pump if installed Check whether the operation of the drain pump is normal Repair it A faulty drain pump results in water leakage ESIE98 07 Maintenance Part 5 Maintenance 5 5 3 5 1 5 1 3 Maintenance for Outdoor Units Checks To maintain the indoor unit proceed as follows Item Check If not Otherwise Outdoor heat exchanger Check whether the heat exchanger is clean Clean with low pressure water and dry it with a vacuum cleaner A dirty heat exchanger results in poor capacity Electrical connection Check whether all electrical connections are tightened properly Tighten them A loose connection can result in sparks Propeller Check whether the propeller is in balance Change propeller An unbalanced propeller results in a higher noise level Casing Check whether the casing is undamaged Repaint damaged parts Damage of casing leads to a rusty unit Insulation Check whether the insulation is in normal shape Repair it A bad insulation results in poor outlook of the installa tion Noise level Check whether there is no abnormal noise Find the problem refer to Sounds on page 3 4 It can result in a higher noise level Drain heat p
32. No No Yes Yes Yes Yes Yes Yes Begin End Replace PCB 2 Overview of Fault Indications on Indoor Units ESIE98 07 3 30 Part 3 Troubleshooting 3 1 3 4 5 3 5 Thermistor Abnormality Fault code C4 C9 LED indication The following table shows the LED indication of the indoor unit Error method The relation between the temperatures detected by the thermistors and the resistance of the thermistors is used to determine the errors Error generation During compressor operation the error is generated when the thermistor input is more than 4 96 V or less than 0 04 V Causes The following list shows the possible causes I Faulty connector connection I Faulty thermistor I Faulty PCB Procedure The following flow chart shows the troubleshooting procedure Condition LED A green LED B green normal 9 9 fault 9 9 Check the connector connection Is it connected properly Correct the connection Check the thermistor resistance Refer to 3 61 Is it normal Replace the thermistor Replace the PCB Replace the PCB to which the thermistor is connected Yes No No Yes Begin End C4 Indoor heat exchanger thermistor R2T C9 Indoor ambient temperature thermistor R1T ESIE98 07 Overview of Fault Indications on Indoor Units Part 3 Troubleshooting 3 31 3 4 5 1 3 6 Faulty Power Supply or Indoor PCB Fa
33. Overview of Fault Indications on Outdoor Units ESIE98 07 3 56 Part 3 Troubleshooting 3 1 3 4 5 4 13 Thermistor Abnormality Fault code P4 J3 J6 H9 LED indication The following table shows the LED indication of the indoor unit Error method The temperatures detected by the thermistors are used to determine this error Error generation The error is generated when the thermistor input is more than 4 96 V or less than 0 04 V Causes The following list shows the possible causes I Faulty connector connection I Faulty thermistor I Faulty outdoor PCB 1 Procedure The following flow chart shows the troubleshooting procedure Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 0 0 8 8 Check the connector connection Is it connected properly Correct the connection Check the thermistor resistance Refer to 3 61 Is it normal Replace the thermistor Replace the outdoor PCB 1 Yes No No Yes End Begin P4 Radiation switch box thermistor R4T J3 Discharge pipe thermistor R3T J6 Outdoor heat exchanger thermistor R2T H9 Outdoor ambient thermistor R1T ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 57 3 4 5 1 4 14 Faulty Outdoor PCB and Transmitting receiving Circuit Fault code 8 LED indication The following table shows the LED i
34. thermistor Outdoor heat exchanger thermistor Outdoor ambient temperature thermistor Indoor ambient temperature thermistor Indoor heat exchanger thermistor Symbol R4T R3T R2T R1T R1T R2T Discharge tempera ture control Refer to page 2 23 _ 0 _ _ _ _ Freeze up preven tion Refer to page 2 23 _ _ _ _ 0 _ Peak cut off Refer to page 2 23 _ _ _ _ 0 _ Control tempera ture switch box Refer to page 2 26 0 _ _ _ _ _ Maximum frequency control in function of outdoor ambient temperature Refer to page 2 23 _ _ 0 _ _ _ ESIE98 07 General Functionality Part 2 Functional Description 2 5 3 2 4 5 1 with 0 available functions and _ no available functions Defrost Refer to page 2 14 _ _ 0 0 _ 0 High pressure limi tation in heating Refer to page 2 23 _ _ 0 _ _ 0 Controls switch box thermistor Discharge pipe thermistor Outdoor heat exchanger thermistor Outdoor ambient temperature thermistor Indoor ambient temperature thermistor Indoor heat exchanger thermistor General Functionality ESIE98 07 2 6 Part 2 Functional Description 3 1 2 4 5 Expansion valve control The following table shows the thermistors that control the expansion valve with 0 available functions and _ no available functions Thermistors Symbol Defrost operation Disconnected discharge
35. 24 1 16 Other Control 2 26 Part 3 Troubleshooting 3 1 1 Troubleshooting 1 1 What Is in This Chapter 3 3 1 2 Overview of General Cases 3 4 1 3 Safeties 3 6 2 Overview of General Problems 2 1 What Is in this Chapter 3 9 2 2 No Operation Operation Lamp Off 3 10 2 3 Poor Cooling or Heating Effect 3 12 2 4 Operation Stop Through Breaker 3 13 2 5 Abnormal Operation Sound and Vibration 3 15 2 6 Other Problems 3 17 2 7 Faulty Four way Valve 3 18 ESIE98 07 Table of Contents iii 3 4 5 1 3 Overview of Fault Indications on Indoor Units 3 1 What Is in this Chapter 3 23 3 2 Faulty Indoor PCB 3 24 3 3 Freeze up Prevention or High Pressure Control 3 26 3 4 Fan Motor Abnormality 3 28 3 5 Thermistor Abnormality 3 30 3 6 Faulty Power Supply or Indoor PCB 3 31 3 7 Signal Transmission Error 3 33 4 Overview of Fault Indications on Outdoor Units 4 1 What Is in this Chapter 3 35 4 2 Insufficient Gas Detection 3 36 4 3 Low Voltage or Main Circuit Overvoltage 3 38 4 4 Overload Activation 3 40 4 5 Discharge Pipe Temperature Abnormality 3 42 4 6 Compressor Start up Error 3 43 4 7 Radiation Fin Temperature Rise 3 45 4 8 Current Transformer Error 3 47 4 9 Output Current Error 3 49 4 10 Input Overcurrent Error 3 51 4 11 Electrical Box Temperature Rise 3 53 4 12 Faulty Outdoor PCB 3 55 4 13 Thermistor Abnormality 3 56 4 14 Faulty Outdoor PCB and Transmitting receiving Circuit 3 57 5 Additi
36. 35 CDB 24 CWB Equivalent reference piping length 7 5 m Heating capacity The heating capacity is based on indoor temperature of 20 CDB and outdoor temperature of 7 CDB 6 CWB Equivalent reference piping length 7 5 m Indoor units FTX25GV1NB FTX35GV1NB Outdoor units RX25GV1NB RX35GV1NB cooling capacity min nominal max 0 9 2 6 3 1 kW 0 9 3 5 3 6 kW heating capacity min nominal max 0 9 3 6 4 6 kW 0 9 4 2 5 1 kW moisture removal 1 4 l h 2 3 l h running current cooling heating 4 0 A 4 9 A 6 4 A 6 2 A power consumption 865 W 1 075 W 1 410 W 1 420 W power factor 94 0 95 4 95 8 96 8 COP 3 01 3 35 2 48 3 04 piping connections liquid 6 4 mm 6 4 mm gas 9 5 mm 12 7 mm drain 18 0 mm 18 0 mm maximum interunit piping length 25 m 20 g m additional charge for piping length exceeding 10 m minimum interunit piping length 2 5 m maximum installation level difference 15 m heat insulation both liquid and gas pipe n of wiring connections 3 for power supply 4 for interunit wiring ESIE98 07 General Outline Part 1 System Outline 1 5 3 1 4 5 1 Indoor units In the following table you will find the technical specifications for the indoor units Features FTX25GV1NB FTX35GV1NB front panel colour almond white air flow rate cooling heating H 7 5 m min 8 4 m min 7 9 m min 8 4 m min M 6 4 m min
37. 4 Test Run from the Remote Controller Introduction You are able to test the air conditioner through the remote controller independent from the room temperature and the temperature setting i e with the thermostat of the indoor unit bridged Carry out the test operation using the operation manual Test procedure To run the test proceed as follows If the system is not used for a certain time switch off the circuit breaker to avoid unnecessary power consumption Step Action 1 Press the ON OFF button of the remote controller to switch on the system 2 I Press buttons UP 1 DOWN 2 and MODE 3 simultaneously I Press the MODE 3 button two times to start the test mode 3 Wait until the test mode terminates approximately 60 minutes and switches automatically into normal mode 4 Press the ON OFF button to exit MODE FAN OFF TIMER ON TIMER CANCEL TEMP TIME UP DOWN 1 2 3 ESIE98 07 Part 5 Maintenance 5 1 4 3 4 55 Part 5 Maintenance Introduction Preventive maintenance should be set up for operation at maximum capacity or to avoid damage The following chapters explain how to or when to maintain the units What is in this part This part contains the following chapters Topic See page 1 Maintenance page 5 3 ESIE98 07 5 2 Part 5 Maintenance 3 1 5 ESIE98 07 Maintenance Part 5 Maintenance 5 3 3 5 5 5 P
38. 4 8 4 9 main k 4 7 operation range cooling mode k 4 9 cooling k 4 9 heating mode k 4 9 operation space k 1 8 operation stops k 3 5 outlook drawing k 1 8 outlook drawing k 1 8 outlook drawing k 1 8 output current error k 3 49 output voltage check PCB 2 k 3 60 overload activation k 3 40 ESIE98 07 viii Index 3 1 4 5 General index FTX25GV1NB FTX35GV1NB RX25GV1NB RX35GV1NB P P3 k 3 56 P4
39. 7 1 m min 6 8 m min 7 1 m min L 5 3 m min 5 9 m min 5 7 m min 5 9 m min fan type cross flow fan motor output 13 W 13 W speed 5 steps and auto air direction control right left horizontal and downwards air filter removable washable mildew proof running current cooling heating 0 16 A power consumption cooling heating 35 W power factor cooling heating 95 1 temperature control microcomputer control dimensions HxWxD 250 x 750 x 180 mm weight 7 kg sound pressure level H L cooling heating 38 30 dBA 38 30 dBA 39 31 dBA 39 31 dBA General Outline ESIE98 07 1 6 Part 1 System Outline 3 1 4 5 Outdoor units In the following table you will find the technical specifications of the outdoor units Features RX25GV1NB RX35GV1NB casing colour ivory white compressor type hermetically sealed swing type model 1YC23ZXD motor output 750 W 1 000 W refrigerant oil model SUNISO 4GS DI charge 0 35 l 0 35 l refrigerant model R 22 charge 0 9 kg 0 9 kg air flow rate cooling heating 24 5 14 5 m min 21 12 5 m min 24 5 14 5 m min 21 12 5 m min fan type propeller motor output 22 W running current cooling heating 3 84 A 4 74 A 6 24 A 6 04 A power consumption cooling heating 830 W 1 040 W 1 375 W 1 385 W power factor cooling heating 94 0 95 4 95 8 96 8 starting current cooling heating 4
40. 9 A 6 4 A dimensions HxWxD 550 x 695 x 245 mm weight 36 kg 36 kg sound pressure level cooling heating 45 dBA 46 dBA 46 dBA 47 dBA ESIE98 07 General Outline Part 1 System Outline 1 7 3 1 4 5 1 1 3 Electrical Specifications Unit combination The following table gives an overview of the electrical specifications of the indoor outdoor unit combinations Note The following list explains some of the items in the table above I The rated load amperage RLA is based on the following conditions indoor temperature 27 CDB 19 CWB outdoor temperature 35 CDB I Maximum allowable voltage MFA imbalance between phases is 2 I Select the wire size based on a larger value of the minimum circuit amperage MCA or total overcurrent amperage TOCA I Instead of a fuse use a circuit breaker I Voltage range The units are suitable for use on electrical systems where the voltage supplied to unit terminals is not below or above listed operation limits Indoor unit FTX25GV1NB FTX35GV1NB Outdoor unit RX25GV1NB RX35GV1NB frequency 50 Hz voltage 230 V power voltage voltage range 207 253 V minimum circuit amperage MCA 11 5 A maximum fuse amperage MFA 12 A compressor rated load amperage RLA 3 16 A 5 96 A outdoor fan motor OFM fan motor rated output 22 W full load amperage FLA 0 28 A indoor fan motor IFM fan motor rated output 13 W fu
41. AC 230V 1 50Hz PCB2 M1F Y1E M Y1R Q1L R3T R2T R1T YLW RED BRN BLU M1C Z3C S30 U N V W U 1 4 _ TRM1 V W N U V W _ DB3 MRC W V3 3 15A FU V2 SA1 CT1 MRM10 MRM20 _ DB1 TAB1 TAB2 WHT WHT L1R C1R WHT RED SSR1 HC7 HC8 C2R HC12 BLU PCB1 RX25 35GV1NB Q5E C89 Z2C t t t outdoor disharge condenser WHT C82 C89 C1R C2R capacitor CT1 current transformer DB1 DB3 diode bridge F1U field fuse FU fuse L live L1R reactor M1C compressor motor M1F fan motor MRC W solid state relay MRH MRL MRM10 MRM20 magnetic relay N neutral PCB1 PCB2 printed circuit board Q1L overload protector Q5E field earth leak detector R1T R3T thermistor S20 S94 connector SA1 surge arrester SSR1 solid state relay TAB1 TAB2 connector TRM1 transistor module V1 V2 V3 varistor X1M terminal strip Y1E electronic expansion valve coil Y1R reversing solenoid valve coil Z1C Z3C ferrite core ESIE98 07 Wiring Layout Part 1 System Outline 1 17 3 1 4 5 1 3 4 Main PCB Layout for Indoor Units FTX25GV1NB and FTX35GV1NB Main board PCB 1 The drawing below shows PCB 1 of the indoor units FTX25GV1NB and FTX35GV1NB Refer to Wiring diagram FTX25GV1NB FTX35GV1NB on page 1 15 for more information concerning this PCB board Symbol
42. Commissioning and Test Run 4 3 3 4 5 1 Part 4 1 Pre Test Run Checks 1 1 What Is in This Chapter Introduction To assure proper operation of the unit this chapter explains how to check before running the unit Overview This chapter covers the following topics Topic See page 1 2 Checks for Test Run page 4 4 1 3 Setting the Remote Controller page 4 5 Pre Test Run Checks ESIE98 07 4 4 Part 4 Commissioning and Test Run 3 1 4 5 1 2 Checks for Test Run Installation check A checklist is given below I The indoor and outdoor unit the interconnection and the power supply cable are at least 1 m away from televisions or radios This is to prevent interference from the air conditioner I Make sure that air is distributed on the entire room I The wall is strong enough to bear the weight of the indoor unit I The unit is not exposed to direct sunlight I There are no obstructions for air inlet and outlet I The wall hole to the outdoor side for the electric wiring the refrigerant and drain piping can be made without problems in terms of building structure Checks before test run A checklist is given below I Measure the voltage at the primary side of the safety breaker and check that it is 230 V 10 I Check that the liquid stop valve and the gas stop valve are fully open I Never use a power supply shared by another appliance Test run checks To e
43. FTX25GV1NB FTX35GV1NB page 1 8 Indoor PCB 2 output voltage check U4 page 3 60 Inverter page 2 8 Main board PCB 1 of indoor unit page 1 17 Main board PCB 2 of indoor unit page 1 18 Main board PCB 3 of indoor unit page 1 18 Main board PCB 4 of indoor unit page 1 19 Main board PCB 1of outdoor unit page 1 20 Main board PCB 2 of outdoor unit page 1 21 ESIE98 07 Appendix 2 Appendix Drawings 3 1 5 3A Motor efficiency page 2 12 Night set mode page 2 21 To open or close the service cover page 3 71 Outdoor unit RX25GV1NB RX35GV1NB page 1 8 Power supply waveform check page 3 62 Power transistor output voltage check page 3 65 Quick heating quick cooling page 2 9 Rectifier check page 3 67 Reluctance DC Motor page 2 12 Principle of reluctance DC motor page 2 13 Removal of electrical box page 3 78 Removal of electrical parts page 3 84 Removal of fan rotor and motor page 3 80 Removal of reactor page 3 87 Removal of swing motor page 3 76 Removal of propeller fan and motor page 3 82 Replacing the air purifying filters page 3 70 Rotor structure page 2 13 Service check page 3 6 SSR1 check page 3 68 Step Flow page 2 17 Swing Compressor page 2 11 swing off start page 2 17 swing on start page 2 18 Switch Box Layout page 1 14 Thermistor resistance check P4 J3 J6 H9 page 3 61 Pre heat operation page 2 21 Wiring diagram FT
44. PCB and Transmitting receiving Circuit 8 1 time page 3 57 Overview of Fault Indications on Outdoor Units ESIE98 07 3 36 Part 3 Troubleshooting 3 1 3 4 5 4 2 Insufficient Gas Detection Fault code U0 LED indication The following table shows the LED indication of the outdoor unit Error method The input current checked by the current transformer and the frequency control are used to detect gas shortage Error generation The error is generated during a check of the input current when I input lt 12 256 A Hz x foperating 1 75 when foperating gt 74 Hz for a period of 14 seconds The system shuts down when the error is confirmed 4 times The timer automatically resets when one of the following errors does not occur within a period of 60 minutes of accumulated runtime after the first error generation I overload activation E5 I radiation fin temperature rise L4 I gas shortage detection U0 I compressor start up error E6 I current transformer error H8 I thermistor abnormality J3 Causes The following list shows the possible causes I gas shortage due to refrigerant leaks I Input current decrease due to inadequate compression of the compressor Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 8 8 0 0 ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 37 3
45. Piping Layout ESIE98 07 1 10 Part 1 System Outline 3 1 4 5 2 2 Functional Diagram Refrigeration Circuit Functional diagram indoor unit The figure below displays the functional diagram of the refrigeration circuit of the indoor units FTX25GV1NB and FTX35GV1NB Main parts refrigeration circuit The numbers in the table below refer to the numbers in the piping diagram above M 1 3 3 2 4 liquid pipe gas pipe N Part name Function 1 Fan motor The fan motor is a phase controlled 5 step motor An automatic con trol is available 2 Heat exchanger The heat exchanger is of the multi louvre fin type Hi X tubes and coated waffle louvre fins are used 3 Field piping connections The copper tube of the field piping depends on the model of the indoor unit 4 Muffler The muffler is used to absorb the refrigerant noise and is installed in FTX35GV1NB and FTX25GV1ND Models Copper tube liquid pipe Copper tube gas pipe FTX25GV1NB 6 4 mm 9 5 mm FTX35GV1NB 6 4 mm 12 7 mm ESIE98 07 Piping Layout Part 1 System Outline 1 11 3 1 4 5 1 Functional diagram outdoor unit The figure below displays the functional diagram of the refrigeration circuit of the outdoor units RX25GV1B and RX35GV1NB Main parts refrigeration circuit The numbers in the table below refer to the numbers in the piping diagram above RX25GV1NB 9 5 RX35GV1NB 12 7 A M R1T
46. a in the drawing below 3 When the room temperature reaches 15 C or higher the flap moves to the set angle Refer to b in the drawing below Item Process swing off start Upper limit swing position fully open 20 Initial value or previous setting Lower limit swing position Straight down air flow 80 Directed towards back wall 90 Closed Swing ON Swing OFF Value in memory Value in memory Value in memory Thermostat OFF Thermostat ON Operation ON a b General Functionality ESIE98 07 2 18 Part 2 Functional Description 3 1 2 4 5 I The movements of the large and small flap are not linked They move with a time delay of several seconds I The diffuser and flaps cover the air outlet when the unit is not operating swing on start Item Process Upper limit swing position fully open 20 Swing OFF Thermostat OFF defrost start Value in memory Swing ON Operation STOP Closed Lower limit swing position Directed towards back wall 90 ESIE98 07 General Functionality Part 2 Functional Description 2 19 3 2 4 5 1 1 11 Fan Speed Control for Indoor Units Control mode The airflow rate can be automatically controlled depending on the difference between the set temperature and the room temperature This is done through phase control and Hall IC control For more information about Hall IC refer to Hall
47. doors are not closed Bad ventilation I Verify if the air flow and air direction are set correctly Refer to Outlook Drawing on page 1 8 I Too long refrigerant pipes The maximum interunit piping length is 25 m I Incorrect charge Charge an additional refrigerant amount of 20g m for a pipe is longer than 10 m When the pipe is longer than 10m cut jumper S50 refer to page 1 17 Procedure The following flowchart shows the troubleshooting procedure Is the temperature setting appropriate Refer to 4 7 Switch the thermostat off Set the appropriate temperature Are the air filters clean Clean Refer to 3 69 Is the unit capacity adequate for load Replace or add a unit Are the refrigerant pipes longer than 25 m Check for refrigerant leaks or replace the refrigerant Yes No Yes Yes Yes No No No Is the indoor outdoor unit combination correct Refer to1 4 Connect the matching units No Check the temperature setting Begin Relocate the unit to achieve proper pipe length End ESIE98 07 Overview of General Problems Part 3 Troubleshooting 3 13 3 4 5 1 2 4 Operation Stop Through Breaker Possible causes The following list shows the possible causes I Insufficient capacity of the main breaker Refer to Electrical Specifications on page 1 7 I Section of the power supply cable is too small I Supply voltage fluctuation is
48. gt 4 C if Tambient outdoor lt 19 C I Theat exchanger gt 18 C if Tambient outdoor lt 3 C I Theat exchanger gt 1 C x Tambient outdoor 15 if 3 C lt Tambient outdoor lt 19 C Condition Description 1 I 40 minutes of accumulated runtime I not yet 90 minutes of accumulated runtime I condition 1 or 2 or 3 in the table below 2 I 90 minutes of accumulated runtime I condition 1 or 4 or 5 in the table below Conditions Description 1 Toutdoor heat exchanger lt 15 C 2 I Tambient outdoor lt 5 C I Toutdoor heat exchanger lt 5 Tambient outdoor x 0 4 I check if Tindoor heat exchanger decreases 6 times every 10 seconds 3 I Tambient outdoor 5 C I Toutdoor heat exchanger lt 3 C I check if Tindoor heat exchanger decreases 6 times every 10 seconds 4 I Tambient outdoor lt 5 C for 60 seconds I Toutdoor heat exchanger lt 5 Tambient outdoor x 0 4 for 60 seconds 5 I Tambient outdoor 5 C for 60 seconds I Toutdoor heat exchanger lt 3 C for 60 seconds ESIE98 07 General Functionality Part 2 Functional Description 2 15 3 2 4 5 1 1 8 Forced Operation Mode Forced mode The following table explains the different forced operation modes forced cooling and forced heating The protective functions overrule the forced mode Item Forced cooling Forced heating Conditions I not in the 3 minute stand
49. more than 10 of the rated voltage 230 V I Section of the connection cable is too small indoor unit power supply I Short circuit of air Refer to Outlook Drawing on page 1 8 I Refrigerant overcharge Overview of General Problems ESIE98 07 3 14 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troubleshooting procedure Is the capacity of the main breaker as specified Refer to 1 7 Install a main breaker with the correct capacity Is the diameter of the power supply cable 2 5 mm2 Install the correct cable Is the fluctucation of the power supply voltage within 10 of the rated voltage Contact power company Is the operation space provided Refer to 1 8 Provide required space Is the diameter of the connection cable 1 5 mm2 Install the correct cable Is the amount of refrigerant correct Yes No No No No No Yes Yes Yes Yes Check the main breaker Begin Yes No End Vacuum dry the unit and charge the correct amount of refrigerant Contact your dealer ESIE98 07 Overview of General Problems Part 3 Troubleshooting 3 15 3 4 5 1 2 5 Abnormal Operation Sound and Vibration Possible causes The following list shows the possible causes I Pipes are too short lt 2 5 m I Mounting wall is too thin I Inadequate isolation to prevent vibration I Pro
50. on Outdoor Units ESIE98 07 3 40 Part 3 Troubleshooting 3 1 3 4 5 4 4 Overload Activation Fault code E5 LED indication The following table shows the LED indication of the outdoor unit Error method Internal protection of the compressor is detected using the open condition of the internal protector of the compressor Error generation The error is generated when the internal protection activation is sent from the internal protection circuit to the microcomputer The contact opens at 120 C 3 C and closes at 95 C 10 C The system shuts down when the activation of the internal protector is detected 2 times The timer automatically resets when one of the following errors does not occur within a period of 60 minutes of accumulated runtime after the first error generation I the radiation fin temperature rise L4 I gas shortage detection U0 I compressor start up error E6 Causes The following list shows the possible causes I Overload activation due to insufficient refrigerant I Error detection due to a faulty overload contact I Overload activation due to a faulty 4 way valve Refer to Faulty Four way Valve on page 3 18 I Error detection due to a faulty connector S40 I Detection error due to a broken wire in the internal protector Q1L shield I Detection error due to faulty outdoor PCB 1 I Error detection due to insufficient vacuuming in the pipes Condition
51. out Press the emergency button to start automatic mode automatic fan speed temperature set point of 22 C and preservation of the last swing flap position and press the button again to stop Operation lamp The operation lamp flashes when the following errors are detected I When the unit is disabled because of activation of a protection device or malfunction of the thermistors Refer to Overview of Fault Indications on Indoor Units on page 3 23 and Overview of Fault Indications on Outdoor Units on page 3 35 I When a transmission error occurs between the indoor and outdoor unit Service check To find the malfunction code proceed as follows emergency button Step Action 1 Set the diagnostic mode by pressing the UP 1 DOWN 2 and MODE 3 button simultaneously The display starts to blink 2 Operate the room temperature switch by pressing the buttons UP 1 and DOWN 2 until the remote controller starts beeping short beep MODE FAN OFF TIMER ON TIMER CANCEL TEMP TIME UP DOWN 1 2 3 OFF TIMER TEMP TIME UP DOWN 1 2 ESIE98 07 Troubleshooting Part 3 Troubleshooting 3 7 3 4 5 1 3 Set the diagnostic mode again by pressing the MODE button 1 The display starts to blink 4 Operate the room temperature switch by pressing the UP 1 and DOWN 2 button until the remote controller starts beeping long beep 5 Press the MODE
52. panel 2 Remove the 3 screws 3 Remove the fan rotor and motor together from the unit 4 Loosen the hexagon head screw on the fan rotor to remove the motor ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 81 3 4 5 1 5 Press the bearing with the fin ger from the outside to remove it Step Action Drawing Additional Checks and Repair for Troubleshooting ESIE98 07 3 82 Part 3 Troubleshooting 3 1 3 4 5 5 5 Repair for Outdoor Units Removal of propeller fan and motor To remove the propeller fan and motor proceed as follows Step Action Drawing 1 Remove the drip proof cover for the electrical parts Do not break the cover 2 Disconnect connector S70 of PCB 2 Do not hold the lead wires of the connector while dis connecting but pull out the con nector terminal 3 Remove the motor lead wire through the opening between the indoor heat exchanger tem perature thermistor R3T and the electrical parts 4 Remove the nut to take off the propeller fan ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 83 3 4 5 1 5 Remove the 2 screws to take off the fan motor 6 Disengage the catches that fas ten the motor lead wires 7 Remove motor Reassemble the motor with the specification plate upward Step Action Drawing Hook Additional Che
53. temperature Frequency limits Limited during the activation of following functions Low I four way valve operation compensation Refer to page 2 26 I compressor lock prevention I DC inverter control High I high fin temperature control Refer to page 2 23 I discharge pipe temperature control Refer to page 2 23 I low outdoor temperature control Refer to page 2 23 I high pressure limitation Refer to page 2 23 I peak cut off Refer to page 2 23 I freeze up prevention Refer to page 2 23 I defrost control Refer to page 2 14 General Functionality ESIE98 07 2 10 Part 2 Functional Description 3 1 2 4 5 Forced cooling heating operation For more information refer to Forced mode on page 2 15 ESIE98 07 General Functionality Part 2 Functional Description 2 11 3 2 4 5 1 1 5 Swing Compressor Features The following list shows the features of the swing compressor I The roller and blade are integrated to prevent friction This eliminates refrigerant leakage and provides high energy efficiency The suction and compression process is performed by a swinging movement of the roller I The swing compressor has 1 piston I The innovative structure adapts the use of HFC refrigerant by effective lubrication of sliding surfaces For rotary compressors adaptation to HFC requires major modifications I The compressor uses a DC motor Draw
54. transistor TRM1 Refer to 3 63 Is it abnormal Replace outdoor PCB 1 Check the power transistor output voltage Refer to 3 65 Are the outputs of phases U V and W unbalanced Replace outdoor PCB 1 Check the power supply voltage Is it different from 230 V Correct the power supply Is there compressor seizing short circuit in coil phases or breaking of wire Replace the compressor Check the discharge pressure Refer to 3 67 Check the installation condition Refer to 3 66 Yes No Yes Yes Yes Yes Yes No No No No No Causes momentary power supply voltage drop excessively large load on the compressor motor short circuit in the electrical circuit due to a defective contact Begin End 2 ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 51 3 4 5 1 4 10 Input Overcurrent Error Fault code LED indication The following table shows the LED indication of the indoor unit Error method During compressor operation the input overcurrent is checked by the input current detected by the current transformer CT1 Error generation During compressor operation the error is generated when the input current remains above 17 A for 2 5 seconds Causes The following list shows the possible causes I Overcurrent due to faulty compressor I Overcurrent due to faulty power transistor TRM1 I Ov
55. 1 System Outline Introduction This part outlines all the relevant elements in an installation of the Split Inverter room air conditioners Once all the elements of the installation are described in short and the installation set up is understood a functional description of all elements will be given in the next parts of this book What is in this part This part contains the following chapters Topic See page 1 General Outline page 1 3 2 Piping Layout page 1 9 3 Wiring Layout page 1 13 ESIE98 07 1 2 Part 1 System Outline 3 1 4 5 ESIE98 07 General Outline Part 1 System Outline 1 3 3 1 4 5 1 Part 1 1 General Outline 1 1 What Is in This Chapter Introduction In this chapter you will find the outlook drawing and the installation outline of the indoor units FTX25GV1NB FTX35GV1NB and the outdoor units RX25GV1NB RX35GV1NB Overview This chapter covers the following topics Topic See page 1 2 Technical Specifications page 1 4 1 3 Electrical Specifications page 1 7 1 4 Outlook Drawing page 1 8 General Outline ESIE98 07 1 4 Part 1 System Outline 3 1 4 5 1 2 Technical Specifications Unit combination In the following table you will find the technical specifications of the total units Cooling capacity The cooling capacity is based on indoor temperature of 27 CDB 19 CWB and outdoor temperature of
56. 1 What Is in this Chapter Introduction In the first stage of the troubleshooting sequence it is important to interpret the fault indication on the remote controller display This will help you to find the cause of the problem for the outdoor units I The fault indication of the indoor unit has priority Refer to Overview of Fault Indications on Indoor Units on page 3 23 I Some of the faults are not directly indicated on the remote controller because they need to be generated several times If you want to check immediately you can check the LED indication on the indoor PCB Overview This chapter covers the following topics Topic Fault code Shutdown after See page 4 2 Insufficient Gas Detection U0 4 times page 3 36 4 3 Low Voltage or Main Circuit Overvoltage U2 16 times page 3 38 4 4 Overload Activation E5 2 times page 3 40 4 5 Discharge Pipe Temperature Abnormality F3 4 times page 3 42 4 6 Compressor Start up Error E6 16 times page 3 43 4 7 Radiation Fin Temperature Rise L4 4 times page 3 45 4 8 Current Transformer Error H8 4 times page 3 47 4 9 Output Current Error L5 16 times page 3 49 4 10 Input Overcurrent Error 1 time page 3 51 4 11 Electrical Box Temperature Rise 1 time page 3 53 4 12 Faulty Outdoor PCB 8 1 time page 3 55 4 13 Thermistor Abnormality P4 J3 J6 H9 4 times page 3 56 4 14 Faulty Outdoor
57. 4 maintenance k 5 5 normal operating mode k 2 7 ESIE98 07 Index vii 3 4 5 1 General index FTX25GV1NB FTX35GV1NB RX25GV1NB RX35GV1NB O odour escapes k 3 4 off period k 4 8 opening service cover k 3 71 operating mode forced k 2 7 2 15 main k 2 7 normal k 2 7 operating modes k 2 7 operation abnormal sound and vibration k 3 15 lamp k 3 6 stop through breaker k 3 13 stop k 3 17 operation data cooling mode k 4 8 drying mode k 4 8 general k 4 8 heating k
58. CB 1 Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 0 0 8 8 Overview of Fault Indications on Outdoor Units ESIE98 07 3 48 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troubleshooting procedure Switch the power off and back on again Does the error occur again Refer to 3 62 Operate the unit Is the current normal Refer to 3 62 Check the capacitor voltage C1R and C2R Refer to 3 63 Replace outdoor PCB 1 Is the voltage 324 VDC Check the connector connection Is it not connected properly Correct it Check the conductivity in the compressor coil Is there conductivity Replace outdoor PCB 1 Replace the compressor Switch the power off Check the conductivity of reactor L1R Is it abnormal Switch on the power again Does it function properly Check the rectifiers DB1 and DB3 Refer to 3 67 Are they normal Replace outdoor PCB 1 Replace the rectifier DB1 and DB2 Yes No Replace the reactor L1R Replace outdoor PCB 1 Yes Yes Yes Yes Yes Yes Yes No No No No No No No Begin End ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 49 3 4 5 1 4 9 Output Current Error Fault code L5 LED indication The following table shows the LED indic
59. CB 2 output voltage k 3 60 power supply waveform k 3 62 power transistor output current k 3 64 power transistor output voltage k 3 65 power transistor k 3 63 pre test run k 4 3 rectifier k 3 67 refrigerant system k 3 66 SSR1 k 3 68 test run k 4 4 units k 3 60 3 62 checks before test run k 4 4 checks for test run
60. Description S6 connector for swing motor lower horizontal flap M1S S7 connector for control of fan speed M1F S21 connector for centralized control to 5 rooms KRC72 S24 communication connector between PCB 1 and PCB 3 S26 communication connector between PCB 1 and PCB 4 S32 connector for indoor heat exchanger thermistor R2T S37 communication connector between PCB 1 and PCB 2 SW2 address switch SW8 reset switch for air filter LED A fault indication LED B fault indication S7 S32 S26 S6 LED A LED B SW8 S24 S21 SW2 S37 Wiring Layout ESIE98 07 1 18 Part 1 System Outline 3 1 4 5 Main board PCB 2 The drawing below shows PCB 2 of the indoor units FTX25GV1NB and FTX35GV1NB Refer to Wiring diagram FTX25GV1NB FTX35GV1NB on page 1 15 for more information concerning this PCB board Main board PCB 3 The drawing below shows PCB 3 of the indoor units FTX25GV1NB and FTX35GV1NB Refer to Wiring diagram FTX25GV1NB FTX35GV1NB on page 1 15 for more information concerning this PCB board Mail Symbol Description S1 connector fan motor M1F S36 communication connector between PCB 2 and PCB 1 S1 S36 Symbol Description S25 communication connector between PCB 3 and PCB 1 LED 3 ON OFF indication H1P on wiring LED 4 time clock indication H2P on wiring LED 5 filter indication H3P on wiring S25 LED 3 LED 4 LED 5 ESIE98
61. IC check A6 on page 3 60 Phase steps Phase control and fan speed control contains 8 steps LLL LL L ML M HM H and HH Within this range the airflow rate is automatically controlled when the AIRFLOW ADJUSTING button is set to AUTOMATIC Refer to automatic airflow rate control Automatic air flow control for heating The following drawing explains the principle for fan speed control for heating When there is no operation and the night set mode turns on the step is low Refer to Night set mode on page 2 21 Automatic air flow control for cooling The following drawing explains the principle of fan speed control for cooling Step Cooling Heating Dry mode LLL 510 780 rpm LL L ML M MH H HH 1 5 C 0 5 C 1 C 2 C L ML M Phase control Thermostat setting temperature fan speed Temperature difference between ambient and set temperature 1 5 C 0 5 C 2 C 1 C M ML L Phase control Thermostat setting temperature fan speed Temperature difference between ambient and set temperature General Functionality ESIE98 07 2 20 Part 2 Functional Description 3 1 2 4 5 1 12 Fan Speed Control for Outdoor Units Control The following drawing explains the fan speed control Fan off delay When the compressor turns off and Toutdoor ambient gt 20 C the outdoor fan stays running at the same speed for 30 secon
62. IE98 07 Test Run amp Operation Data Part 4 Commissioning and Test Run 4 7 3 4 5 1 Part 4 2 Test Run amp Operation Data 2 1 What Is in This Chapter Introduction The following drawings and tables give an overview of the measurements that you can do Use it as a guideline during commissioning For the location of the measurement points we refer to the piping and wiring diagrams in Part 1 Overview This chapter covers the following topics Topic See page 2 2 General Operation Data page 4 8 2 3 Operation Range page 4 9 Test Run amp Operation Data ESIE98 07 4 8 Part 4 Commissioning and Test Run 3 1 4 5 2 2 General Operation Data During cooling mode During cooling mode the operating conditions must be as follows During heating mode During heating mode the operating conditions must be as follows During drying mode During drying mode the operating conditions must be as follows Recommended temperature setting The recommended temperature settings are I for cooling maximum 7 C difference from the outdoor temperature I for heating 20 C 24 C Off period Turn the breaker off if you are not using the air conditioner for a long period Items Operating modes If the operation is out of this range Outdoor temperature 20 C to 43 C I A safety device may stop the operation I Condensation may occur on the indoor unit and s
63. LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 0 8 0 8 ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 41 3 4 5 1 Procedure The following flow chart shows the troubleshooting procedure Check the conductivity at overload contact using a tester Is there conductivity Replace the overload protector Q1L Check the overload connector S40 Is it connected properly Correct the connection Check the conductivity of the overload protector shield Is there conductivity Repair the shield Short circuit the overload protector Q1L and switch the unit on Does the abnormality occur again Replace the outdoor PCB 1 Execute a refrigerant check Refer to 3 66 Yes No No No No Yes Yes Yes End Begin Overview of Fault Indications on Outdoor Units ESIE98 07 3 42 Part 3 Troubleshooting 3 1 3 4 5 4 5 Discharge Pipe Temperature Abnormality Fault code F3 LED indication The following table shows the LED indication of the outdoor unit Error method The error is detected through the discharge pipe thermistor R3T Error generation The error is generated when the discharge pipe thermistor is disconnected The system shuts down when the error is generated 4 times The timer automatically resets when no other abnormality occurs within a period of 60 minut
64. M R1T R2T R3T M ESIE98 07 Service Manual Split Inverter RX25GV1NB RX35GV1NB Daikin Europe NV FTX25GV1NB FTX35GV1NB R1T R2T Outdoor unit Indoor unit ESIE98 07 Table of Contents i 3 4 5 1 Table of Contents 1 Introduction 1 1 About This Manual v Part 1 System Outline 1 1 1 General Outline 1 1 What Is in This Chapter 1 3 1 2 Technical Specifications 1 4 1 3 Electrical Specifications 1 7 1 4 Outlook Drawing 1 8 2 Piping Layout 2 1 What Is in This Chapter 1 9 2 2 Functional Diagram Refrigeration Circuit 1 10 3 Wiring Layout 3 1 What Is in This Chapter 1 13 3 2 Switch Box Layout 1 14 3 3 Wiring Diagrams 1 15 3 4 Main PCB Layout for Indoor Units FTX25GV1NB and FTX35GV1NB 1 17 3 5 Main PCB Layout for Outdoor Units RX25GV1NB and RX35GV1NB 1 20 ESIE98 07 ii Table of Contents 3 1 4 5 Part 2 Functional Description 2 1 1 General Functionality 1 1 What Is in This Chapter 2 3 1 2 Functions of Thermistors 2 4 1 3 Operating Modes 2 7 1 4 Frequency Principle 2 8 1 5 Swing Compressor 2 11 1 6 Reluctance DC Motor 2 12 1 7 Defrost Control 2 14 1 8 Forced Operation Mode 2 15 1 9 Wide angle Flaps Diffuser Louvres and Autoswing 2 16 1 10 Step Flow 2 17 1 11 Fan Speed Control for Indoor Units 2 19 1 12 Fan Speed Control for Outdoor Units 2 20 1 13 General Functions 2 21 1 14 Frequency Control 2 23 1 15 Expansion Valve Control 2
65. Make sure that the electric load is discharged from C1R and C2R SSR1 Wait for 15 minutes then check the conductivity between these terminals ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 69 3 4 5 1 5 4 Repair for Indoor Units Air purifying filter The air purifying filter electrostatic filter catches pollen and smoke particles as small as 0 01 micron through electrostatic charging An activated carbon deodorizing filter in net shape is also mounted to absorb and minimize fine odour particles The filter should be cleaned when the cleaning lamp flashes In a dusty environment it is recommended to clean them every 2 weeks Cleaning the air filters To clean the air filters proceed as follows Step Action Drawing 1 Stop the operation and turn the breaker off 2 Open the front grille by lifting the grill by the two tabs at both sides Lift until you hear a click 3 Press the cleaning lamp reset button 4 Take out the filters by pushing them a little upwards and then downwards 5 Take out the air purifying filters to clean with water or a vacuum cleaner If dust stays on the filters wash them with a neutral detergent thinned with water Afterwards dry them in the shade 6 Put the air purifying filters back 7 Close the front grille at the 3 points indicated by the arrows Additional Checks and Repair for Troubleshooting ESIE98 07 3
66. Through Breaker refer to page 3 13 2 5 Abnormal Operation Sound and Vibration refer to page 3 15 2 7 Faulty Four way Valve refer to page 3 18 Overview of General Problems ESIE98 07 3 10 Part 3 Troubleshooting 3 1 3 4 5 2 2 No Operation Operation Lamp Off Possible causes The following list shows the possible causes I The fuse or breaker has blown I The power switch is not turned on I Incorrect power supply voltage Refer to Electrical Specifications on page 1 7 I Wrong connection cable I Incorrect indoor outdoor unit combination Refer to Technical Specifications on page 1 4 I Empty batteries in the remote controller I Incorrect address setting Refer to Setting the Remote Controller on page 4 5 I Activation of protection device e g dirty air filter refrigerant shortage mixing of air due to overcharge Refer to Overview of Fault Indications on Indoor Units on page 3 23 and Overview of Fault Indications on Outdoor Units on page 3 35 I The timer is not set correctly ESIE98 07 Overview of General Problems Part 3 Troubleshooting 3 11 3 4 5 1 Procedure The following flow chart shows the troubleshooting procedure Is it 230 V AC Connect the correct power supply voltage If necessary replace the varistor V1 and fuse FU of the indoor PCB 1 Is the fluctuation of the power supply voltage within app
67. W7 LED LED LED H1P H2P H3P PCB3 S25 PCB1 PCB2 RED WHT BLK GRN YLW S1 H1 H2 H3 FU 3 15A S36 C70 1 2 3 field wiring outdoor indoor M1F M1S SW2 SW8 R2T R1T BLK WHT RED S21 HA S32 S6 S7 S37 FTX25 35GV1NB PCB4 signal receiver S27 S31 S24 S26 X1M t t C70 protective earth FU fuse H1P H3P pilot lamp M1F fan motor M1S swing motor PCB1 PCB4 printed circuit board R1T R2T thermistor S1 S37 connector SW2 address switch SW7 operation switch SW8 cleaning indicator reset switch X1M terminal strip Wiring Layout ESIE98 07 1 16 Part 1 System Outline 3 1 4 5 Wiring diagram RX25GV1NB RX35GV1NB The following diagram shows the wirings and the electrical parts of the outdoor units RX25GV1NB and RX35GV1NB indoor 1 2 3 1 2 3 X1M L N F1U L N RED BLK GRN YLW Z1C RED BLK GRN YLW WHT S94 S93 S91 S HS2 S92 GRN YLW BLK YLW BLK RED WHT BLK BLK L N E2 E1 HC10 HC11 HS1 3 1 V1 1 6 1 3 1 2 1 6 S20 S80 S40 S90 1 4 1 3 1 3 S70 outdoor RED WHT ORG BLK M 1 8 5 3 1 MR L MR H C82 WHT YLW ORG BLU BRN RED BLK BLK RED RED BLU BLU BLK BLK BLK BLK field wiring power supply
68. X25GV1NB FTX35GV1NB page 1 15 Wiring diagram RX25GV1NB RX35GV1NB page 1 16 Call outs See page ESIE98 07 Index i 3 4 5 1 General index FTX25GV1NB FTX35GV1NB RX25GV1NB RX35GV1NB Index This index is set up in three columns In the first column you will find references to the item in general In the second column you will find references to the indoor units and in the third column to the outdoor units Symbols k 3 51 3 53 8 k 3 24 3 31 8 k 3 55 3 57 A A1 k 3 24 A5 k 3 26 A6 k 3 28 abnormal functioning k 3 17 abnormal operation sound and vibration k 3 15 accumulator
69. aces in cooling mode Heating mode During heating mode the large flap enables direct warm air straight downwards The diffuser presses the warm air above the floor to reach the entire room Cooling mode During cooling mode the diffuser retracts into the indoor unit This enables a distribution of cooled air throughout the entire room Louvres The louvres made of elastic synthetic resin provide a wide range of airflow that guarantees a comfortable air distribution Autoswing The following table explains the autoswing process for heating and cooling Item Description Drawing heating The flap swings up and down as shown in the drawing alongside cooling The flap swings up and down as shown in the drawing alongside ESIE98 07 General Functionality Part 2 Functional Description 2 17 3 2 4 5 1 1 10 Step Flow Flow The heating process starts by sending warm air downwards When the walls and floor are sufficiently warm the air flow angle and volume change according to the settings Refer to the operation manual Steps The following table shows the 3 step flow Example The following example explains the difference between a swing off start and a swing on start for heating mode Step Description Process 1 The upper flap is in straight down position The lower flap is fixed at 90 2 When the heat exchanger reaches 34 C or higher the flap moves to send air straight down Refer to
70. art 5 1 Maintenance 1 1 What Is in This Chapter Introduction This chapter explains some basic procedures that you can use for maintenance of the indoor units Make sure that the power supply is turned off and turn the breaker off Overview This chapter covers the following topics Topic See page 1 2 Maintenance for Indoor Units page 5 4 1 3 Maintenance for Outdoor Units page 5 5 1 4 General Maintenance page 5 6 Maintenance ESIE98 07 5 4 Part 5 Maintenance 3 1 5 1 2 Maintenance for Indoor Units Checks To maintain the indoor unit proceed as follows Item Check If not Otherwise Air filter Check whether the air filter is clean The unit must be turned off when you change the filter Clean the filter and dry it with a vacuum cleaner Refer to Cleaning the air filters on page 3 69 A dirty filter results in poor capacity Indoor heat exchanger Check whether the heat exchanger is dirty Clean with low pressure water and a vacuum cleaner A dirty heat exchanger results in poor capacity Electrical connection Check whether all electrical connections are tightened properly Tighten them A loose connection can result in sparks Fan rotor Check whether the rotor is clean Remove the rotor and clean with water Make sure it is dry A dirty rotor results in unbalance Noise level Check whether there is no abnormal noise
71. ating operation high pressure control is activated according to the temperature detected by the indoor heat exchanger thermis tor R2T During the heating operation the error is generated when Tindoor heat exchanger gt 67 C ESIE98 07 Overview of Fault Indications on Indoor Units Part 3 Troubleshooting 3 27 3 4 5 1 Procedure The following flow chart shows the troubleshooting procedure Check the operation space Is there sufficient air passage Provide sufficient air passage Refer to 1 8 Check the intake air filter Is it clean Clean the air filter Refer to 3 69 Check the dust accumulation on the indoor heat exchanger Is it clean Clean the heat exchanger Check the indoor heat exchanger thermistor R2T Does it conform to the thermistor characteristic table Refer to 3 61 Replace the thermistor Is the amount of refrigerant correct Yes No No No No Yes Yes Yes Begin Replace indoor PCB 1 Recharge correct amount No Yes End Overview of Fault Indications on Indoor Units ESIE98 07 3 28 Part 3 Troubleshooting 3 1 3 4 5 3 4 Fan Motor Abnormality Fault code A6 LED indication The following table shows the LED indication of the indoor unit Error method During fan motor operation hall IC detects the rotation speed to determine abnormal fan motor operation Error generation During maximum fan moto
72. ation During compressor operation the error is generated when Tradiation fin gt 87 C The system shuts down when the error is detected 4 times The timer automatically resets when one of the following errors does not occur within a period of 60 minutes of accumulated runtime after the first error generation I the radiation fin temperature rise L4 I gas shortage detection U0 I compressor start up error E6 Causes The following list shows the possible causes I Fin temperature rise due to faulty outdoor fan I Fin temperature rise due to short circuit I Detection due to faulty radiation switch box thermistor R4T I Detection error due to faulty connector connection I Detection error due to faulty outdoor PCB 1 or PCB 2 Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 8 8 8 0 Overview of Fault Indications on Outdoor Units ESIE98 07 3 46 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troubleshooting procedure Switch the power off and back on again to restart the equipment Does the error indication appear again Check the radiation fin thermistor temperature Does the temperature match the value in the table Refer to 3 61 Replace the fin thermistor R4T Is the temperature more than 87 C operation halt temperature Check for looseness of the power transist
73. ation of the indoor unit Error method The output overcurrent is detected by the current flowing in the current transformer CT1 Error generation The error is generated when the output overcurrent detection circuit sends an output overcurrent signal to the microcomputer The system shuts down when the error is confirmed 16 times The timer automatically resets when the compressor operates for 8 minutes without low voltage fan lock or output overcurrent Causes The following list shows the possible causes I Overcurrent due to a faulty power transistor TRM1 I Overcurrent due to a faulty internal wiring I Overcurrent due to a faulty power supply voltage I Overcurrent due to a faulty outdoor PCB 1 I Overcurrent due to a closed stop valve I Overcurrent due to a faulty compressor I Overcurrent due to a faulty installation condition Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 8 0 0 0 Overview of Fault Indications on Outdoor Units ESIE98 07 3 50 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troubleshooting procedure Check the stop valves Are the stop valves fully closed Open them Switch the power off and on again to restart the equipment Is the error gone Execute long term monitoring of the power supply voltage discharge suction pressures etc Check the power
74. button 1 again to go to test mode 30 minutes To end test mode directly press the ON OFF but ton Step Action MODE FAN 1 OFF TIMER TEMP TIME UP DOWN 1 2 MODE FAN 1 Troubleshooting ESIE98 07 3 8 Part 3 Troubleshooting 3 1 3 4 5 Fault indication To execute a fault diagnosis proceed as follows Step Action 1 Press the timer CANCEL button 1 for 5 seconds The display starts to blink 2 Press the timer cancel button repeatedly until a continuous beep is produced 3 Refer to Overview of Fault Indications on Indoor Units on page 3 23 and Overview of Fault Indications on Outdoor Units on page 3 35 to analyse the fault Press the timer cancel button for 5 seconds to cancel the code display The code display also cancels itself when it is not pressed for 1 minute MODE FAN OFF TIMER ON TIMER CANCEL TEMP TIME UP DOWN 1 ESIE98 07 Overview of General Problems Part 3 Troubleshooting 3 9 3 4 5 1 Part 3 2 Overview of General Problems 2 1 What Is in this Chapter Introduction This chapter explains the troubleshooting sequence of problems that can occur without fault indication Overview This chapter covers the following topics Topic See page 2 2 No Operation Operation Lamp Off refer to page 3 10 2 3 Poor Cooling or Heating Effect refer to page 3 12 2 4 Operation Stop
75. by mode I normal operation mode I outdoor unit off I no malfunction in the outdoor unit I forced mode cooling mode I not in the 3 minute stand by mode I normal operation mode I outdoor unit off I no malfunction in the outdoor unit I forced mode heating mode Start Adjustment Press the forced operation switch SW2 to start the following items I command frequency 66 Hz I expansion valve opening depending on capacity of operating room I timer 60 minute I fan speed H I swing flap preservation of last setting I indoor adjustment send forced mode to unit Press the forced operation switch SW2 to start the following items I command frequency 66 Hz I expansion valve opening depending on capacity of operating room I timer 60 minute I fan speed H I swing flap preservation of last setting I indoor adjustment send forced mode to unit Reset Press the forced operation switch again or after 60 minutes Press the forced operation switch again or after 60 minutes General Functionality ESIE98 07 2 16 Part 2 Functional Description 3 1 2 4 5 1 9 Wide angle Flaps Diffuser Louvres and Autoswing Wide angle flap The large flaps send a large volume of air downwards to the floor The flap provides an optimum control in cooling heating and dry mode Diffuser The diffuser enables the air coming out of the indoor unit to reach all surf
76. cks and Repair for Troubleshooting ESIE98 07 3 84 Part 3 Troubleshooting 3 1 3 4 5 Removal of electrical parts To remove the electrical parts proceed as follows Step Action Drawing 1 Remove the 3 screws to take off the bell mouth 2 Disengage the catch at the top 3 Disconnect connector S80 of outdoor PCB 1 Do not hold the lead wires of the connector while disconnecting but pull out the connector terminal TAB1 S80 ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 85 3 4 5 1 4 Remove the lead wires from the clamps in the electrical box 5 Remove the discharge pipe thermistor R3T 6 Disconnect the grounding wire 7 Disconnect the connectors Do not hold the lead wires of the connector while disconnecting but pull out the connector terminal Step Action Drawing Additional Checks and Repair for Troubleshooting ESIE98 07 3 86 Part 3 Troubleshooting 3 1 3 4 5 8 Remove the screw that fas tens the electrical box to the outdoor unit 9 Lift up the electrical parts box Step Action Drawing ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 87 3 4 5 1 Removal of reactor To remove the reactor proceed as follows Step Action Drawing 1 Remove the 2 fixing screws 2 Release the lead wires of the reactor
77. control switch box thermistor R4T To protect the inverter system By switching the outdoor fan into H mode I compressor off I Tfin gt 78 C I crankcase heater off Tfin gt 78 C FAN STOP Tfin gt 80 C ESIE98 07 Part 3 Troubleshooting 3 1 4 3 4 5 3 Part 3 Troubleshooting Introduction The purpose of this chapter is to explain the fault codes on the remote controller and how you can trace and correct errors What is in this part This parts contains the following chapters Topic See page 1 Troubleshooting page 3 3 2 Overview of General Problems page 3 9 3 Overview of Fault Indications on Indoor Units page 3 23 4 Overview of Fault Indications on Outdoor Units page 3 35 5 Additional Checks and Repair for Troubleshooting page 3 59 ESIE98 07 3 2 Part 3 Troubleshooting 3 1 3 4 5 ESIE98 07 Troubleshooting Part 3 Troubleshooting 3 3 3 4 5 1 Part 3 1 Troubleshooting 1 1 What Is in This Chapter Introduction When a problem occurs you have to check all possible faults This chapter gives a general idea of where to look for defects or causes Not all repair procedures are described Some procedures are considered common practice Overview This chapter covers the following topics Topic See page 1 2 Overview of General Cases page 3 4 1 3 Safeties page 3 6 Trouble
78. ction In the first stage of the troubleshooting sequence it is important to interpret the fault indication on the remote controller display This will help you to find the cause of the problem for the indoor units I The fault indication of the indoor unit has priority on the outdoor unit I Some of the faults are not directly indicated on the remote controller because they need to be generated several times If you want to check immediately you can check the LED indication on the indoor PCB Overview This chapter covers the following topics Topic Fault code See page 3 2 Faulty Indoor PCB A1 or 8 3 24 3 3 Freeze up Prevention or High Pressure Control A5 3 26 3 4 Fan Motor Abnormality A6 3 28 3 5 Thermistor Abnormality C4 C9 3 30 3 6 Faulty Power Supply or Indoor PCB 8 or U4 3 31 3 7 Signal Transmission Error U4 3 33 Overview of Fault Indications on Indoor Units ESIE98 07 3 24 Part 3 Troubleshooting 3 1 3 4 5 3 2 Faulty Indoor PCB Fault code A1 or 8 LED indication The following table shows the LED indication of the indoor unit Error method 1 The indoor unit evaluates the zero cross detection of the power supply Error generation 1 The error is generated when there is no zero cross detection for 10s Causes The following list shows the possible causes I Faulty indoor PCB 1 or PCB 2 I Faulty connector connection S36 S37 Proc
79. ds Fan speed modes The following table explains the fan control in normal and forced mode Fan control in cooling mode The following table explains the fan steps in cooling mode Fan control in heating mode The following table explains the fan steps in heating mode OFF ON 28 C 34 C outdoor heat exchanger temperature For ambient temperature between 0 18 C Mode Fan speed Normal cooling heating H L Forced H Tambient outdoor Frequency gt 0 Hz and 44 Hz gt 44 Hz and 84 Hz Frequency gt 84 Hz gt 37 C H H H gt 18 C and 37 C L H H gt 0 C and 18 C L L H lt 0 C STOP STOP STOP Tambient outdoor Frequency 44 Hz gt 44 Hz 5 C H H gt 5 C L H ESIE98 07 General Functionality Part 2 Functional Description 2 21 3 2 4 5 1 1 13 General Functions Pre heat operation When the equipment has stopped and toutside lt 10 C the compressor is warmed up by passing a single phase current through the compressor motor to speed up the start The power consumption is 30 40 W Hot start function During defrosting or when the thermostat is on in heating mode the indoor heat exchanger temperature is measured to avoid cold draft Dry mode The dry mode removes humidity while maintaining the room temperature The temperature and fan cannot be regulated during dry m
80. duct shape deformation I Insufficient refrigerant I Short circuit of air Refer to Outlook Drawing on page 1 8 Overview of General Problems ESIE98 07 3 16 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troubleshooting procedure Listen to the sound of the indoor unit Is the sound generated by vibration of the unit against the wall Correct the installation condition Reinforce the wall Relocate the unit Is the sound generated by mounting base vibration Add cushioning material on the mounting base of the indoor unit Are the pipes not properly connected Add cushioning material and secure with saddles Does the fan contact other parts Correct the problem Are the pipes in contact with the casing of the outdoor unit Manually correct the problem or install weight on the pipes Is the sound produced by refrigerant passing through the motor operated expansion valve Wrap sound insulating putty Yes No Yes Yes Yes Yes Yes No No No No No Is the amount of refrigerant correct Begin Vacuum dry the unit and charge correct amount of refrigerant Contact your dealer Yes No End to avoid vibrations ESIE98 07 Overview of General Problems Part 3 Troubleshooting 3 17 3 4 5 1 2 6 Other Problems Operation stops suddenly operation lamp flashes The foll
81. e conductivity Replace outdoor PCB 2 faulty capacitor Check the installation condition Refer to 3 66 Yes Replace the fan motor Yes Yes Yes Yes No No No No No No Yes Begin End Is the radiation switch box ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 55 3 4 5 1 4 12 Faulty Outdoor PCB Fault code 8 LED indication The following table shows the LED indication of the indoor unit Error method The internal program checks the working of the microcomputer to detect this error Error generation The error is generated when the microcomputer program does not function properly Causes The following list shows the possible causes I The microcomputer program is in abnormal condition due to an external factor like noise momentary voltage drop momentary power failure etc I Faulty outdoor PCB 1 Procedure The following flow chart shows the troubleshooting procedure Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 0 Switch the power on again Is the LED indication off Replace outdoor PCB 1 Check the grounding Is the grounding properly Provide proper grounding No No Yes Yes Then malfunction may be caused by an external factor rather than defective parts Locate the cause and correct the situation End Begin
82. e is still no shift replace the valve ESIE98 07 Overview of General Problems Part 3 Troubleshooting 3 21 3 4 5 1 The valve will not shift from heating to cooling The following list explains what the possible causes can be The numbers in the columns refer to the numbers in the drawing refer to page 3 18 1 2 3 4 5 6 Description Hot Cool Hot as in column 1 Cool as in column 1 Temperature of valve body Temperature of valve body The pressure differential is too high To resolve 1 Raise the head pressure The valve will reverse during pressure equalization period 2 Recheck the system The pilot tubes are clogged To resolve 1 Raise the head pressure 2 Operate the solenoid to free the dirt 3 If there is still no shift replace the valve Hot Cool Hot as in column 1 Cool as in column 1 Hot Temperature of valve body There is dirt in one bleed hole To resolve 1 Raise the head pressure 2 Operate the solenoid 3 If unsuccessful remove the valve and wash it out Check on air before reinstalling If there is still no movement replace the valve add a new strainer to the discharge tube and mount the valve horizontally Hot Cool Hot as in column 1 Cool as in column 1 Hot temperature of valve body The piston cup head leaks To resolve 1 Stop the unit 2 After pressure equalization restart with the solen
83. e shows the functions of open control Disconnected discharge thermistor control The following table shows the functions of disconnected discharge thermistor control Room situation Minimum limit Maximum limit dry mode 95 pulses 450 pulses cooling heating mode 72 pulses 450 pulses power is on initialization open control feedback control compressor stop pressure equalization control compressor on discharge pipe temperature control Function Sensor Thermistor Why How Set Reset Expansion valve control during high discharge pipe temperature discharge pipe thermistor R3T To protect the compressor By opening the expansion valve for 10 pulses every 30 seconds T discharge pipe gt 112 C T discharge pipe lt 107 C Function Sensor Thermistor Why How Set Reset Disconnected discharge pipe control I discharge pipe thermistor R3T I outdoor heat exchanger thermistor R2T I indoor heat exchanger thermistor R1T To detect disconnection of the discharge pipe thermistor By checking the difference between the discharge pipe temperature and the coil temperature T discharge pipe lt Toutdoor during cooling T discharge pipe gt Toutdoor during heating T discharge pipe gt Tcoil This control is executed 5 times before going into failure ESIE98 07 General Functionality Part 2 Functional Description 2 25 Feedback control The following table shows the
84. eck the varistor V1 of indoor PCB 2 Is it discolored or cracked Replace the varistor V1 Check the fuse FU of the indoor PCB 2 Is there conductivity Replace the fuse Switch the power off and back on again Does the same LED indication appear again Check the grounding Is the grounding proper Provide proper grounding The malfunction may be caused by an external factor rather than defective parts Locate the cause and correct the situation Check the connection between indoor PCB 1 and indoor PCB 2 Is it connected properly Check the output voltage of indoor PCB 2 Refer to 3 60 Yes No Correct the connector connection Is it approximately 5 V 0 5V Replace indoor PCB 2 Replace indoor PCB 1 No No No No No No No Yes Yes Yes Yes Yes Yes Yes Begin End ESIE98 07 Overview of Fault Indications on Indoor Units Part 3 Troubleshooting 3 33 3 4 5 1 3 7 Signal Transmission Error Fault code U4 LED indication The following table shows the LED indication of the indoor unit Error method The data received from the outdoor unit through the indoor outdoor signal transmission is checked to detect transmission errors Error generation The error is generated when the data from the outdoor unit cannot be received normally or when the content of the data is abnormal Causes The following list shows the possible caus
85. edure The following flow chart shows the troubleshooting procedure Error method 2 The internal program checks the working of the microcomputer to detect this error Error generation 2 The error is generated when the microcomputer program does not function properly Causes The following list shows the possible causes I The microcomputer program is in abnormal condition due to an external factor like noise momentary voltage drop momentary power failure etc I Faulty indoor PCB 1 Condition LED A green LED B green Refer to normal 9 9 fault 1 8 8 Error method 1 on this page fault 2 0 8 Error method 2 on this page fault 3 9 0 Error method 3 on the following page Check the connector connection S36 and S37 Is it connected properly Correct the connection Replace indoor PCB 1 and or PCB 2 No Yes Begin End ESIE98 07 Overview of Fault Indications on Indoor Units Part 3 Troubleshooting 3 25 3 4 5 1 Procedure The following flow chart shows the troubleshooting procedure Error method 3 The system checks the communication signal between the indoor and outdoor unit Error generation 3 The error is generated when the transmission circuit remains on Causes The cause for this error can be a faulty indoor unit PCB 1 Process Replace the PCB to correct the problem Switch the power off and on again Does the same LED indication appear again C
86. egin End Clean with low pressure tap water ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 67 3 4 5 1 Rectifier check To check the rectifier proceed as follows When the part is damaged remove the terminal conductivity compound Before installing a new rectifier replace it by new compound Discharge pressure check To check the discharge pressure proceed as follows Negative terminal of analog tester Positive terminal of analog tester Normal resistance range Unacceptable resistance range Positive terminal for digital tester Negative terminal for digital tester k to M 0 or 0 0 k to M 0 or Orange Black Red Yellow Check the discharge pressure Is the discharge pressure high Replace the compressor Are the stop valves open Open them Is the connection pipe in normal shape Replace the pipe installed at the site Are the heat exchanger and air filter dirty Replace the compressor Clean them Refer to 3 69 Yes No No No No Yes Yes Yes End Begin Additional Checks and Repair for Troubleshooting ESIE98 07 3 68 Part 3 Troubleshooting 3 1 3 4 5 SSR1 check To check the solid state relay SSR1 proceed as follows Before checking take following precautions in account I Make sure that the power is turned off I
87. emperature and the set temperature Additional control parameters The target frequency is adapted by additional parameters in the following cases I frequency limits I initial settings I forced cooling heating operation Inverter principle To regulate the capacity a frequency control is needed The inverter makes it possible to vary the rotation speed of the compressor The following table explains the conversion principle Drawing of inverter The following drawing shows a schematic view of the inverter principle Phase Description 1 The single phase power supply in AC is converted into DC 2 The single phase power supply DC is converted into a three phase shopped DC voltage with a variable frequency I When the frequency increases the rotation speed of the compressor increases resulting in an increased refrigerant circulation This leads to a higher amount of the heat exchange per unit I When the frequency decreases the rotation speed of the compressor decreases resulting in a decreased refrigerant circulation This leads to a lower amount of the heat exchange per unit 50 Hz 60 Hz Amount of heat exchanged large Amount of heat exchanged small Refrigerant circulation rate high Refrigerant circulation rate low AC power DC power high f low f high speed low speed freq cte freq variable capacity variable Amount of heat exchanged large Amount of heat exchanged sma
88. eplace indoor PCB 2 5V 7 6 5 4 3 2 1 12V Zero cross Indoor unit outdoor unit transmission receiving Indoor unit outdoor unit transmission transmitting Fan motor output voltage of 12 V voltage of 5 V ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 61 3 4 5 1 Thermistor resistance check P4 J3 J6 H9 Check the thermistor resistance when fault code P4 J3 J6 or H9 appears on the display To check the resistance of the thermistors proceed as follows Step Action 1 Remove the connectors of the thermistors on the PCBs For more information about these sensors refer to Wiring Diagrams on page 1 15 and Functions of Thermistors on page 2 4 2 Read the temperature 3 Measure the resistance 4 Check that the measured values correspond with the values in the table below Tester Temperature Resistor value C k 20 211 15 150 10 116 5 5 88 0 67 2 5 51 9 10 40 15 31 8 20 25 25 20 30 16 35 13 40 10 6 45 8 7 50 7 2 Additional Checks and Repair for Troubleshooting ESIE98 07 3 62 Part 3 Troubleshooting 3 1 3 4 5 5 3 Checking the Outdoor Units Current transformer check Check the current of the current transformer CT1 with the oscilloscope Power supply waveform check The following table explains how to check the p
89. er automatically resets when the compressor operates normally for 8 seconds Causes The following list shows the possible causes I Momentary voltage drop I No power supply due to faulty main circuit relay I Faulty power supply on outdoor PCB 1 I Broken circuit pattern on outdoor PCB 1 I Malfunction of capacitors C1R and C2R I Faulty compressor I Malfunction of the solid state relay SSR1 on outdoor PCB 1 Refer to SSR1 check on page 3 68 Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 0 8 8 0 ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 39 3 4 5 1 Procedure The following flow chart shows the troubleshooting procedure Switch the power off and back on again to restart the equipment after 2 minutes Does the unit shut down Monitor supply voltage for an extended period of time due to momentary voltage drop Does the error occur 16 times to cause shutdown Check the solid state relay SSR1 Refer to 3 68 Are the pins marked shorted Replace outdoor PCB 1 Replace the compressor Check the power transistor output Refer to 3 65 Are the output voltages between U V V W and W U balanced Replace the compressor Check the wires Replace outdoor PCB 1 Yes No Yes Yes Yes No No No Begin End Overview of Fault Indications
90. ercurrent due to faulty electrolytic capacitor C1R or C2R of the inverter circuit I Overcurrent due to faulty outdoor PCB 1 I Overcurrent due to short circuit Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 8 0 8 0 Overview of Fault Indications on Outdoor Units ESIE98 07 3 52 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troubleshooting procedure Is the measured value higher than 17A Replace outdoor PCB 1 Check the power transistor TRM1 Refer to 3 63 Is it normal Replace outdoor PCB 1 Check the power transistor output voltage Refer to 3 65 Are the U V and W phases in balance Replace outdoor PCB 1 Check the resistance of C1R and C2R Does the resistance increase Replace them Check the discharge pressure Refer to 3 67 Check the installation condition Refer to 3 66 Yes No No No No Yes Yes Yes Restart the equipment and measure the input current End Begin 0 2 ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 53 3 4 5 1 4 11 Electrical Box Temperature Rise Fault code LED indication The following table shows the LED indication of the indoor unit Error method During compressor operation the electrical box temperature rise is detected by the radiation switch bo
91. es I Faulty indoor PCB 1 I Faulty outdoor PCB 1 I Indoor outdoor signal transmission error due to a wiring error I Indoor outdoor signal transmission error due to a disturbed power supply waveform Refer to Power supply waveform check on page 3 62 I Indoor outdoor signal transmission error due to a broken connection wire between the indoor and the outdoor units Condition LED A green LED B green normal 9 9 fault 9 8 Overview of Fault Indications on Indoor Units ESIE98 07 3 34 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troubleshooting procedure Check the connection wires between the indoor and outdoor unit Correct the wires Check LED A of the outdoor unit Troubleshoot the outdoor unit Refer to 3 35 Check the power supply waveform Refer to 3 62 Is there disturbance Replace PCB 1 and PCB 2 of the indoor unit Locate the cause of the disturbance and correct it No Yes Yes Yes No No Yes Check the voltage of the connection wires between the indoor and outdoor unit between 1 2 2 3 No Replace the wires Is LED A flashing Is the voltage different from 0 V Are they properly connected Begin End ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 35 3 4 5 1 Part 3 4 Overview of Fault Indications on Outdoor Units 4
92. es of accumulated runtime after the first error generation Causes The cause can be a disconnected discharge thermistor R3T Procedure The following flow chart shows the troubleshooting procedure Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 0 8 0 8 ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 43 3 4 5 1 4 6 Compressor Start up Error Fault code E6 LED indication The following table shows the LED indication of the outdoor unit Error method Compressor start up errors are detected using the rotation data from the motor windings of the compressor Error generation The error is generated when the compressor tries to restart 16 times within a time range of 60 minutes Causes The following list shows the possible causes I Start up error due to a disconnected junction cable of the compressor I Start up error due to faulty compressor I Start up error due to faulty outdoor PCB 1 I Start up error due to closed stop valve I Start up error due to faulty motor operated expansion valve Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 8 0 0 8 Overview of Fault Indications on Outdoor Units ESIE98 07 3 44 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troublesh
93. functions of feedback control Function Sensor Thermistor Why How Set Reset feedback control I discharge pipe thermistor R3T I outdoor heat exchanger R1T I indoor heat exchanger thermistor R2T To calculate an optimum discharge temperature By checking the outdoor ambient temperature and the indoor heat exchanger temperature in order to calculate an optimum discharge temperature discharge temperature control discharge pipe thermistor R3T To protect the compressor By reducing the frequency I at compressor start T discharge pipe gt 115 C I at compressor stop T discharge pipe gt 124 C T discharge pipe lt 107 C ESIE98 07 General Functionality Part 2 Functional Description 2 26 1 16 Other Control Other control functions The following table shows the other different functions which are not frequency or expansion valve controlled Function Sensor Thermistor Why How Set Reset Malfunction four way valve operation To cool and defrost By energizing the coil of the four way valve I start of cooling operation I start of defrost operation I forced cooling I compressor stop I start of heating operation fin temperature control switch box thermistor R4T To protect the inverter system By switching off the compressor and turning on the outdoor fan into H mode Tfin gt 87 C Tfin lt 72 C FAN STOP switch box
94. heck the grounding Is the grounding proper Provide proper grounding No No Yes Yes The malfunction may be caused by an external factor rather than defective parts Locate the cause and correct the situation Replace outdoor PCB 1 Begin End Overview of Fault Indications on Indoor Units ESIE98 07 3 26 Part 3 Troubleshooting 3 1 3 4 5 3 3 Freeze up Prevention or High Pressure Control Fault code A5 LED indication The following table shows the LED indication of the indoor unit Error The following table explains the 2 possibilities Causes The following list shows the possible causes I Operation halt due to a clogged air filter Refer to Cleaning the air filters on page 3 69 I Operation halt due to dust accumulation on the indoor heat exchanger I Operation halt due to insufficient air passage Refer to Outlook Drawing on page 1 8 I Detection error due to a faulty indoor heat exchanger thermistor R2T I Detection error due to a faulty indoor unit PCB 1 I Incorrect refrigerant charge Condition LED A green LED B green normal 9 9 fault 9 9 Error method Error generation During the cooling operation freeze up preven tion is activated according to the temperature detected by the indoor heat exchanger thermis tor R2T During the cooling operation the error is generated when Tindoor heat exchanger lt 0 C During the he
95. ing The following drawing shows the swing compressor Swing General Functionality ESIE98 07 2 12 Part 2 Functional Description 3 1 2 4 5 1 6 Reluctance DC Motor Definition A measure of opposition presented to magnetic flux in a magnetic circuit analogous to resistance in an electric circuit It is equal to a magnetomotive force divided by magnetic flux Also known as magnetic reluctance Introduction The reluctance DC motor uses a neodymium magnet a magnet with a higher magnetic power than the ferrite magnet which produces a magnetic torque and a reluctance torque a rotating force created by the change in the attraction between iron and magnet The combined force generates a powerful rotation The motor is especially effective in saving energy consumption in the low frequency range Motor efficiency The following drawing shows the difference in efficiency between the reluctance DC motor the DC motor and AC motor N S Magnet Iron Iron is pulled towards the magnet 50 60 70 80 90 0 30 60 90 120 Motor efficiency Rotation speed rps Reluctance DC motor Conventional DC motor AC motor ESIE98 07 General Functionality Part 2 Functional Description 2 13 3 2 4 5 1 Rotor structure The following drawings show the difference in structure between the conventional DC motor and the reluctance DC motor Principle Magnetic lines pr
96. ionality Part 2 Functional Description 2 23 Part 2 1 14 Frequency Control Frequency controlled functions The following table shows the different functions which are controlled by decreasing or increasing the frequency Function Sensor Thermistor Why How Set Reset Malfunction High fin temperature control switch box thermistor R4T To protect the switch box against a high temperature By setting a high frequency limit T fin gt 82 C T fin gt 75 C Discharge temperature control discharge temperature thermistor R3T To protect the compressor By setting a high frequency limit T discharge pipe gt 115 C T discharge pipe lt 107 C T discharge pipe gt 124 C UNIT STOP Low outdoor temperature control outdoor ambient thermistor R1T To avoid condensation in cooling mode This control is not executed when the unit is in forced cooling mode or in test mode By setting a high frequency limit Toutdoor ambient lt 25 C T outdoor ambient gt 33 C High pressure limitation in heat ing I outdoor temperature thermistor R1T I indoor heat exchanger thermistor R2T To control the pressure By setting a high frequency limit I heating mode I Toutdoor gt 16 C I Tindoor heat exchanger gt 22 C I compressor on I compressor stop I timer delay 70 s has passed Freeze up prevention indoor heat exchanger thermistor R2T To preve
97. itch box control k 2 26 layout k 1 14 thermistor k 2 4 ESIE98 07 x Index 3 1 4 5 General index FTX25GV1NB FTX35GV1NB RX25GV1NB RX35GV1NB T technical specifications k 1 4 temperature maintenance k 5 6 recommended setting k 4 8 test run checks k 4 4 from remote controller k 4 10 main k 4 7 thermistor abnormality k 3 30 abnormality k 3 56 ambient temperature k 2 4 ambient temperature k 2 4 discharge pipe k 2 4 functions
98. itch box and the wiring diagrams Overview This chapter covers the following topics Topic See page 3 2 Switch Box Layout page 1 14 3 3 Wiring Diagrams page 1 15 3 4 Main PCB Layout for Indoor Units FTX25GV1NB and FTX35GV1NB page 1 17 3 5 Main PCB Layout for Outdoor Units RX25GV1NB and RX35GV1NB page 1 20 Wiring Layout ESIE98 07 1 14 Part 1 System Outline 3 1 4 5 3 2 Switch Box Layout Location The following drawing shows the main components of the switch box Functionality The following table explains the items in the drawing above C1R C2R PCB 2 TRM1 PCB 1 SSR1 Item Explanation C1R C2R capacitors Refer to Capacitor voltage check on page 3 63 PCB 1 printed circuit board 1 Refer to Main board PCB 1 on page 1 20 PCB 2 printed circuit board 2 Refer to Main board PCB 2 on page 1 21 TRM1 transistor module Refer to Power transistor check on page 3 63 Power transis tor output current check on page 3 64 and Power transistor output voltage check on page 3 65 SSR1 solid state relay Refer to SSR1 check on page 3 68 ESIE98 07 Wiring Layout Part 1 System Outline 1 15 3 1 4 5 1 3 3 Wiring Diagrams Wiring diagram FTX25GV1NB FTX35GV1NB The following diagram shows the wirings and the electrical parts of the indoor units FTX25GV1NB and FTX35GV1NB 1 2 3 M M S
99. ll max freq 108 Hz min freq 15 Hz cooling 16 Hz heating ESIE98 07 General Functionality Part 2 Functional Description 2 9 3 2 4 5 1 Inverter features The inverter provides the following features I The regulating capacity can be changed according to the changes in the outside temperature and cooling heating load I Quick heating and quick cooling The compressor rotational speed is increased when starting the heating or cooling This enables a quick set temperature I Even during extreme cold weather the high capacity is achieved It is maintained even when the outside temperature is 0 C I Comfortable air conditioning A detailed adjustment is integrated to ensure a fixed room temperature It is possible to air condition with a small room temperature variation I Energy saving heating and cooling Once the set temperature is reached the energy saving operation enables to maintain the room temperature at low power Frequency limits The following table shows the functions that define the minimum and maximum frequency Initial setting The initial frequency is automatically set in the following cases I compressor start except for defrost I compressor start after defrost reset I change over from cooling to heating based on the outdoor ambient temperature and discharge pipe temperature 60 120 300 45 C Start seconds inverter normal heat pump Air discharge
100. ll load amperage FLA 0 16 A General Outline ESIE98 07 1 8 Part 1 System Outline 3 1 4 5 1 4 Outlook Drawing Drawings The following drawings indicate the following important items I dimensions I service space I operation space Indoor unit FTX25GV1NB FTX35GV1NB The figure below displays the outlook of the indoor unit FTX25GV1NB and FTX35GV1NB Outdoor unit RX25GV1NB RX35GV1NB The figure below displays the outlook of the outdoor unit RX25GV1NB and RX35GV1NB 250 182 180 50 MIN 750 50 MIN 740 60 30 MIN 3D007309A the arrows show the piping direction name plate terminal strip ambient temperature thermistor air flow minimum service space minimum service space minimum operation space DAIKIN 420 470 113 50 50 50 23 27 115 120 10 72 695 245 550 84 64 209 279 295 100 300 150 100 150 50 Model A 9 5 12 7 RX25GV1B RX35GV1B A flare connection 6 4 flare connection operation space ESIE98 07 Piping Layout Part 1 System Outline 1 9 3 1 4 5 1 Part 1 2 Piping Layout 2 1 What Is in This Chapter Introduction This chapter explains the different parts of the internal refrigeration circuit Overview This chapter covers the following topics Topic See page 2 2 Functional Diagram Refrigeration Circuit page 1 10
101. main circuit breaker When you shut down the unit using the remote controller the capacitors discharge This causes inaccurate measurement 3 Measure between and of the power transistor TRM1 using a multi tester DC mode The voltage of the capacitors is measured between and of the power transis tor TRM1 while the and of the capacitors are connected to the and of the transistor 4 If the voltage is 130 V 30VDC then the capacitors work properly Additional Checks and Repair for Troubleshooting ESIE98 07 3 64 Part 3 Troubleshooting 3 1 3 4 5 Power transistor output current check To check the output current of the power transistor proceed as follows Step Action 1 Remove the panels 2 Snap a clamp meter around the red U yellow V or blue W wires inside the compres sor to measure the current Do not short circuit the terminals of the red yellow and blue wires Do not touch the terminals of the red yellow and blue wires when the power is on 3 Conduct forced cooling 4 When the output frequency has stabilized measure the output current of each phase If the compressor stops before the output frequency stabilizes measure the output voltage Refer to Power transistor output voltage check on page 3 65 If then the output currents of each phase are balanced the situation is normal one of the phases is out of balance replace outd
102. move the 2 screws 3 Remove the swing box assem bly The mounting screws for the swing box assembly are different in length from the screws of the swing motor ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 77 3 4 5 1 4 Remove the swing motor by loosening the 2 screws Step Action Drawing Additional Checks and Repair for Troubleshooting ESIE98 07 3 78 Part 3 Troubleshooting 3 1 3 4 5 Removal of electrical box To remove the electrical box proceed as follows Step Action Drawing 1 Remove the indoor heat exchanger thermistor R2T 2 Disconnect S1 S7 and S6 of the electrical box Do not hold the lead wires of the connector while disconnecting but pull out the connector terminal 3 Remove the screw located at the bottom of the electrical box ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 79 3 4 5 1 4 Lift up the electrical box slightly and disengage the catch at the bottom side 5 Disengage the catch at the top side 6 Pull forward to remove the electrical box Step Action Drawing Additional Checks and Repair for Troubleshooting ESIE98 07 3 80 Part 3 Troubleshooting 3 1 3 4 5 Removal of fan rotor and motor To remove the fan rotor and motor proceed as follows Step Action Drawing 1 Remove the right side
103. n This Chapter Introduction This chapter details on the control functions of the system Understanding these functions is vital when diagnosing a malfunction is related to the functional control Overview This chapter covers the following topics Topic See page 1 2 Functions of Thermistors page 2 4 1 3 Operating Modes page 2 7 1 4 Frequency Principle page 2 8 1 5 Swing Compressor page 2 11 1 6 Reluctance DC Motor page 2 12 1 7 Defrost Control page 2 14 1 8 Forced Operation Mode page 2 15 1 9 Wide angle Flaps Diffuser Louvres and Autoswing page 2 16 1 10 Step Flow page 2 17 1 11 Fan Speed Control for Indoor Units page 2 19 1 12 Fan Speed Control for Outdoor Units page 2 20 1 13 General Functions page 2 21 1 14 Frequency Control page 2 23 1 15 Expansion Valve Control page 2 24 1 16 Other Control page 2 26 General Functionality ESIE98 07 2 4 Part 2 Functional Description 3 1 2 4 5 1 2 Functions of Thermistors Location of thermistors The thermistors on the drawing below are used to control the system This control secures a proper cooling and prevents problems of the unit Frequency control The following table shows the thermistors that control the frequency M R1T R2T R3T cooling heating M R2T R1T Outdoor unit Indoor unit Controls switch box thermistor Discharge pipe
104. ndication of the indoor unit Error The following table explains the 2 possibilities Causes The following list shows the possible causes I Display disabled by faulty power supply I Faulty signal transmitting receiving circuit of outdoor PCB 1 I Microcomputer program is in abnormal condition due to an external factor like noise momentary voltage drop momentary power failure etc I Faulty outdoor PCB 1 Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 8 _ _ _ _ Error method Error generation The internal program checks the operation of the microcomputer to detect this error The error is generated when the microcomputer program does not function properly The data received from the outdoor unit through the indoor outdoor signal transmission is checked by the indoor unit to detect this error The error is generated when the data trans mitted by the outdoor unit cannot be received properly by the indoor unit Overview of Fault Indications on Outdoor Units ESIE98 07 3 58 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troubleshooting procedure Check the power supply voltage Is it 230V Correct the power supply Check fuse FU of outdoor PCB 1 Is there conductivity Replace the fuse Check the varistors V1 V2 and V3 of outdoor PCB 1 Is there conductivity Replace the vari
105. nt the freezing up of the indoor unit in cooling mode By setting a high frequency limit I during cooling I 0 C lt Tindoor heat exchanger lt 13 C Tindoor heat exchanger gt 13 C for 2 seconds Tindoor heat exchanger lt 0 C result compressor stop Peak cut off indoor heat exchanger thermistor R2T To prevent an abnormal high temperature on the indoor heat exchanger in heating mode By setting a high frequency limit I during heating I 50 C lt Tindoor heat exchanger lt 67 C Tindoor heat exchanger lt 50 C for 2 seconds Tindoor heat exchanger gt 67 C result compressor stop ESIE98 07 General Functionality Part 2 Functional Description 2 24 1 15 Expansion Valve Control Control Expansion valve control is used to maintain a constant discharge pipe temperature and to regulate an equalized pressure in the system The expansion valve is set by the frequency and the outdoor ambient temperature Initialization The expansion valve is initialized when the power is switched on The initialization contains I the closure of the expansion valve by 650 pulses current opening 0 I after closure of the expansion valve it opens again by 150 pulses for normal working Limits The following table shows the limits of the expansion valve opening Sequence The following flowchart shows a simplified view of the expansion valve control Open control The following tabl
106. ode Night set mode The night set mode is activated when the off timer is set It switches the fan speed to low to minimize the noise 10 C 12 C OFF OFF ON Outside temperature warm up control for compressor 0 5 C 55 Hz 55 Hz 5 min 5 min ON point Frequency switching point OFF point Compressor control Indoor unit fan Low Hz Stop Stop Stop Stop Stop Stop Low Hz Low Hz Extra low Hz Extra low Hz Extra low Hz Extra low Hz Low air flow Item Description Drawing cooling The set temperature stays on for one hour then decreases slightly for economical operation 0 5 C 0 5 C 0 5 C A A B B A B When the outside temperature is lower than 27 C and the room temperature is at the set temperature When the outside temperature is 27 C or higher Timer operation Night set circuit on 1 hour 30 min temperature shift 0 5 C temperature shift Temperature setting remains operation stops at the set hours temperature setting 1 C temperature setting 0 5 C temperature setting General Functionality ESIE98 07 2 22 Part 2 Functional Description 3 1 2 4 5 heating The set temperature stays on for one hour then increases slightly for economical operation Item Description Drawing 2 C Thermostat setting Timer operation Night set circuit on 1 hour later ESIE98 07 General Funct
107. oduced by electromagnets pass through iron easily but not through air or magnet When magnets are embedded deep into the rotor of a motor the magnetic lines of force on the south pole of the magnet extend tangentially The bent magnetic lines evoke a force in order to straighten This creates a second rotating force which a conventional motor does not generate Since this force is generated by the difference in resistance against magnetic lines it is called a reluctance torque Working The following drawing shows the working principle N S S N S N N S S S N N N N S S Conventional DC motor Reluctance DC motor Ferrite surface magnet Embedded neodymium magnet Magnetic torque Powerful magnetic torque Reluctance torque Iron Neodymium N S Magnetic line of force Rotating force Iron General Functionality ESIE98 07 2 14 Part 2 Functional Description 3 1 2 4 5 1 7 Defrost Control Principle Defrost control is carried out by reversing the cycle from heating to cooling Start conditions Defrost control is set by the following conditions I during heating I 6 minutes after the compressor has started up I when condition 1 or 2 in the table below are applicable Conditions The following table shows the different conditions on which defrost control is based Stop conditions Defrost control is reset by the following conditions I Theat exchanger
108. oid deenergized 3 If the valve shifts reattempt with the compressor on If there is no reversal replace the valve Hot Cool Hot as in column 1 Cool as in column 1 Hot Hot The pilot is defective replace the valve Warm Cool Warm as in column 1 Cool as in column 1 Warm Temperature of valve body The compressor is defective Overview of General Problems ESIE98 07 3 22 Part 3 Troubleshooting 3 1 3 4 5 Leak when heating mode The following list explains what the possible causes can be The numbers in the columns refer to the numbers in the drawing refer to page 3 18 1 2 3 4 5 6 Description Hot Cool Hot as in column 1 Cool as in column 1 Temperature of valve body Warmer than valve body At the end of the slide the piston needle is leaking To resolve 1 Operate the valve several times 2 Recheck 3 If there is an excessive leak replace the valve Hot Cool Hot as in column 1 Cool as in column 1 Warmer than valve body Warmer than valve body The piston needle and pilot nee dle are leaking To resolve 1 Operate the valve several times 2 Recheck 3 If there is an excessive leak replace the valve ESIE98 07 Overview of Fault Indications on Indoor Units Part 3 Troubleshooting 3 23 3 4 5 1 Part 3 3 Overview of Fault Indications on Indoor Units 3 1 What Is in this Chapter Introdu
109. onal Checks and Repair for Troubleshooting 5 1 What Is in This Chapter 3 59 5 2 Checking the Indoor Units 3 60 5 3 Checking the Outdoor Units 3 62 5 4 Repair for Indoor Units 3 69 5 5 Repair for Outdoor Units 3 82 Part 4 Commissioning and Test Run 4 1 1 Pre Test Run Checks 1 1 What Is in This Chapter 4 3 1 2 Checks for Test Run 4 4 1 3 Setting the Remote Controller 4 5 ESIE98 07 iv Table of Contents 3 1 4 5 2 Test Run amp Operation Data 2 1 What Is in This Chapter 4 7 2 2 General Operation Data 4 8 2 3 Operation Range 4 9 2 4 Test Run from the Remote Controller 4 10 Part 5 Maintenance 5 1 1 Maintenance 1 1 What Is in This Chapter 5 3 1 2 Maintenance for Indoor Units 5 4 1 3 Maintenance for Outdoor Units 5 5 1 4 General Maintenance 5 6 Appendix Drawings A 1 ESIE98 07 Introduction v 3 4 5 1 Introduction 1 1 About This Manual Split Inverter The Split Inverter room air conditioners contain an outdoor unit RX25GV1NB controlling indoor unit FTX25GV1NB or an outdoor unit RX35GV1NB controlling indoor unit FTX35GV1NB They are designed for cooling and heating applications Before starting up the unit for the first time make sure it has been properly installed Consult the Installation manual and Pre Test Run Checks on page 4 3 You will find the following tools at the back of the manual I a list of drawings Refer to Appendix Drawings I an inde
110. oor PCB 1 ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 65 3 4 5 1 Power transistor output voltage check To check the output voltage of the power transistor TRM1 proceed as follows Step Action 1 Remove the panels 2 Connect a multi meter between the red U and blue W wire on the compressor to meas ure the voltage Do not short circuit the terminals of the red yellow and blue wires Do not touch the terminals of the red yellow and blue wires when the power is on 3 Conduct forced cooling 4 Measure the voltage between the operation start when the fans start rotating and operation halt caused by a current transformer fault after 15 seconds 5 Reset the power 6 Connect the multi meter between 2 the other wire combinations 7 Conduct forced cooling again to measure the other phase combinations 8 Measure the voltage again to for other phase combinations 9 Compare the voltages U V U W and V W with the solid line below Compressor Red Blue Yellow Multi meter AC voltage range 185 V 100 V 15 seconds normal abnormal abnormal V t start If then the voltages are similar to the voltages on the solid line above outdoor PCB 1 is normal one of the voltages is not similar to the volt ages on the solid line above check the cable between the power transistor and the compressor If this is normal replace
111. ooting procedure Check the stop valves Are the stop valves open Fully open them Check the voltage of the capacitors C1R and C2R Refer to 3 63 Is it normal Switch off the power to check the electric conduction of reactor L1R Is there conductivity Is the wire connected properly Correct it Replace the electrical parts TRM1 DB1 DB3 C1R C2R and L1R Replace reactor L1R Are the electrical connections towards the compressor and control circuit correctly Check the power transistor TRM1 Refer to 3 63 Is it normal Replace the outdoor PCB 1 Check the power transistor output Refer to 3 64 U V and W balanced Check the wires Replace outdoor PCB 1 Does the error occur several times before causing the shutdown Check the motor operated expansion valve Replace the valve Replace the compressor Yes No Correct it Yes Yes Yes Yes Yes Yes Yes No No No No No No No End Begin Are the outputs of phases 2 ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 45 3 4 5 1 4 7 Radiation Fin Temperature Rise Fault code L4 LED indication The following table shows the LED indication of the outdoor unit Error method During compressor operation the radiation fin temperature rise is detected using the temperature of the radiation switch box thermistor R4T Error gener
112. or TRM1 and the fin installation If they are securely mounted replace outdoor PCB 1 or power transistor TRM1 Check the outdoor fan voltage Is it approx 190V Replace outdoor PCB 2 Check the conductivity of fan capacitor C82 Has its resistance increased Yes No Yes Yes Yes Yes No No No No Check the outdoor fan rotation Is it rotating Are the radiation fins excessively dirty Check the installation condition Refer to 3 66 Clean the heat exchanger fins No No Yes Yes End Begin Replace outdoor PCB 2 Replace the faulty capacitor C82 Replace the fan motor ESIE98 07 Overview of Fault Indications on Outdoor Units Part 3 Troubleshooting 3 47 3 4 5 1 4 8 Current Transformer Error Fault code H8 LED indication The following table shows the LED indication of the outdoor unit Error method Current transformer errors are detected using the operating frequency of the compressor and the input current of CT1 Error generation The error is generated when the operating frequency of the compressor is more than 56 Hz and the current transformer input is less than 0 08 V The system shuts down when the current transformer error is generated 4 times Causes The following list shows the possible causes I Faulty power transistor TRM1 I broken wire or faulty connection of internal wiring I Faulty reactor L1R I Faulty outdoor P
113. otor k 3 82 fan rotor k 3 80 PCB k 3 72 propeller k 3 82 reactor k 3 87 swing motor k 3 76 repair k 3 59 repair k 3 69 repair k 3 82 replacing air purifying filter k 3 70 resistance check thermistor k 3 61 rotor structure k 2 13 S safeties
114. outdoor PCB 1 Additional Checks and Repair for Troubleshooting ESIE98 07 3 66 Part 3 Troubleshooting 3 1 3 4 5 Refrigerant system check To check the refrigerant system proceed as follows Installation condition check To check the installation condition proceed as follows Are there leaks in the refrigerant system Is the discharge thermistor R3T disconnected from the holder Connect the thermistor properly Is the temperature of the 4 way valve at the suction side abnormally high Replace the 4 way valve Refer to 3 18 Replace the refrigerant Yes No Yes No End Begin Correct it Recharge the system Yes No Check the installation condition Is the minimum space for all air passage around the suction and discharge areas regarded Refer to 1 8 Change the position of the air discharge grille or change the installation location Does the discharged air from possible other outdoor units cause an increase of the suction air temperature Change the position of the air discharge grille or the installation location Is the heat exchanger very dirty Clean the heat exchanger Is the air flow blocked by obstacles or winds blowing in the opposite wind direction Change the installation location or direction Check the outdoor ambient temperature R1T This temperature must be lower than 43 C Yes No No No No Yes Yes Yes B
115. ower supply waveform Current 25A 5A 2 min Time The capacitor will be discharged when MRM1 is ON Step Action 1 Measure the power supply waveform between pin 1 and 3 of X1M 2 Check whether the power supply waveform is a sine wave 3 Check whether there is waveform disturbance near the zero cross 4 Adjust the supply voltage or contact your electricity company ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 63 3 4 5 1 Power transistor check To check the power transistor TRM1 proceed as follows Before checking make sure that the voltage between and of the power transistor is approximately 0 V Capacitor voltage check To check the voltages of the capacitors C1R and C2R proceed as follows During operation the voltage of the capacitors C1R and C2R is 280 V Step Action 1 Disconnect S30 from outdoor PCB 1 2 Execute the following check with a tester Negative terminal of analog tester Positive terminal of analog tester Normal resistance range Unacceptable resistance range Positive terminal of digital tester Negative terminal of digital tester power transistor side U V W k to M short 0 or open U V W power transistor side power transistor side U V W U V W power transistor side Step Action 1 Operate the unit for several minutes 2 Shut down using the
116. owing list explains what the possible causes can be I Verify if the air filters are clean If not refer to page 3 69 Cleaning the air filters I Verify if there is no blockage of the air inlet and outlet of the indoor and outdoor units I Check if the remote controller does not indicate a fault code Refer to Overview of Fault Indications on Indoor Units on page 3 23 and Overview of Fault Indications on Outdoor Units on page 3 35 Abnormal functioning The air conditioner may malfunction with lightning or radio waves To check proceed as follows Step Action 1 Switch the breaker off 2 Switch it back on 3 Check the operation by trying to operate using the remote controller If there is still no operation check the remote controller Refer to Overview of Fault Indications on Indoor Units on page 3 23 and Overview of Fault Indications on Outdoor Units on page 3 35 Overview of General Problems ESIE98 07 3 18 Part 3 Troubleshooting 3 1 3 4 5 2 7 Faulty Four way Valve Four way valve The following drawing indicates the main components necessary to execute a good troubleshooting Normal cooling The following table explains the normal condition of the four way valve in cooling mode Normal heating The following table explains the normal condition of the four way valve in heating mode 6 5 4 1 2 3 discharge tube from the compressor suction tube to
117. pipe control High discharge temperature Feed back control Outdoor ambient temperature thermistor R1T 0 _ _ 0 Outdoor heat exchanger thermistor R2T 0 0 cooling _ _ Discharge pipe thermistor R3T _ 0 0 0 switch box thermistor R4T _ _ _ _ Indoor ambient temperature thermistor R1T _ _ _ _ Indoor heat exchanger thermistor R2T _ 0 heating _ 0 ESIE98 07 General Functionality Part 2 Functional Description 2 7 3 2 4 5 1 1 3 Operating Modes Modes There are two operating modes I normal operating mode I forced operating mode Overview The following table shows the different control modes of the Split inverter room air conditioners The outdoor unit retains the operating mode when the thermostat is switched off Mode Item Normal operating mode Cooling Dry keep Heating Defrosting automatic Stop mode I Pre heat operation Refer to Pre heat operation on page 2 21 I Stop Forced operating mode Forced cooling Forced heating General Functionality ESIE98 07 2 8 Part 2 Functional Description 3 1 2 4 5 1 4 Frequency Principle Main control parameters The compressor is frequency controlled during normal operation The target frequency is set by the following 2 parameters coming from the operating indoor unit I the load condition of the operating indoor unit I the difference between the room t
118. r Units page 3 62 5 4 Repair for Indoor Units page 3 69 5 5 Repair for Outdoor Units page 3 82 Additional Checks and Repair for Troubleshooting ESIE98 07 3 60 Part 3 Troubleshooting 3 1 3 4 5 5 2 Checking the Indoor Units Hall IC check A6 Check the Hall IC when fault code A6 appears on the display To check the Hall IC proceed as follows Indoor PCB 2 output voltage check U4 Check the indoor PCB2 output voltage when fault code U4 appears on the display To check the output voltage of indoor PCB 2 proceed as follows Step Action 1 Make sure that connector indoor S7 on indoor PCB 1 is properly connected 2 Make sure that the power is on and that there is no operation 3 Measure the voltage between pin 1 and 3 of S7 4 Rotate the fan one turn by hand and measure the generated pulses between pin 2 and 3 of S7 5 Execute the check by making a comparison 1 2 3 Gray power supply Purple signals Blue grounding If then the measured voltage between pin 1 and 3 does not equal 5 V replace indoor PCB 1 the generated pulses do not equal 3 pulses replace the fan motor the measured voltage does not equal 5 V and the generated pulses do not equal 3 pulses replace indoor PCB 1 Step Action 1 Make sure that connector S36 on indoor PCB 2 is properly connected 2 Measure the voltage between pin 4 and 6 and between pin 4 and 7 If not r
119. r between PCB 1 and PCB 2 SW1 forced operation switch ON OFF SW2 forced operation connector cooling heating LED A fault indication LED 1 LED 2 LED 3 LED 4 ESIE98 07 Wiring Layout Part 1 System Outline 1 21 3 1 4 5 1 Main board PCB 2 The drawing below shows PCB 2 of the outdoor units RX25GV1NB and RX35GV1NB Refer to Wiring diagram RX25GV1NB RX35GV1NB on page 1 16 for more information concerning this PCB board Symbol Description S70 connector for fan motor M1F S91 communication connector between PCB 2 and PCB 1 S93 communication connector between PCB 2 and PCB 1 S94 communication connector between PCB 2 and PCB 1 S70 S93 S91 S94 Wiring Layout ESIE98 07 1 22 Part 1 System Outline 3 1 4 5 ESIE98 07 Part 2 Functional Description 2 1 4 3 4 5 2 Part 2 Functional Description Introduction This part gives more detailed information on the functions and controls in the unit This information is used as background information for troubleshooting What is in this part This parts contains the following chapters Topic See page 1 General Functionality page 2 3 ESIE98 07 2 2 Part 2 Functional Description 3 1 2 4 5 ESIE98 07 General Functionality Part 2 Functional Description 2 3 3 2 4 5 1 Part 2 1 General Functionality 1 1 What Is i
120. r conditioner gissing sound The refrigerant flow stops or changes inside the unit snapping sound The indoor unit shrinks or expands slightly due to temperature changes Case Explanation heating mode The frost on the outdoor unit melts into water or steam when the air conditioner is in defrost operation cooling or dry mode Moisture in the air condenses into water on the cool surface of the outdoor unit piping and starts dripping The problem can be eliminated by insulating the service valves and piping connections ESIE98 07 Troubleshooting Part 3 Troubleshooting 3 5 3 4 5 1 Outdoor fan rotates when no operation The following table explains why the outdoor fan may rotate Operation stops suddenly operation lamp on To protect the system the air conditioner may stop operating on a sudden large voltage fluctuation It automatically starts operation in about 3 minutes Case Explanation After operation stop The outdoor fan continues rotating for another 30 seconds to cool the electronics While the air conditioner is not in operation When the outdoor temperature is 49 C the outdoor fan starts rotating to protect the system Troubleshooting ESIE98 07 3 6 Part 3 Troubleshooting 3 1 3 4 5 1 3 Safeties Emergency button You can use the emergency button on the front panel of the indoor unit when the remote controller is not available or its batteries have run
121. r speed the error is generated when the detected speed is less than 50 of the power full mode Causes The following list shows the possible causes I Operation halt due to short circuit inside the fan motor winding I Operation halt due to a broken wire inside the fan motor I Operation halt due to broken fan motor lead wires I Operation halt due to faulty capacitor C70 of the fan motor I Detection error due to faulty indoor unit PCB 1 I Detection error due to faulty indoor unit PCB 2 Condition LED A green LED B green normal 9 9 fault 9 9 ESIE98 07 Overview of Fault Indications on Indoor Units Part 3 Troubleshooting 3 29 3 4 5 1 Procedure The following flow chart shows the troubleshooting procedure Does the fan rotate Check hall IC Refer to 3 60 Is there an output Check the fan motor voltage between the red and black wire of S1 Is the voltage 130V Replace the fan motor Replace indoor PCB 2 Replace the fan motor or indoor PCB 2 Rotate the fan by hand Remove the drain pan Operate the indoor fan Does it rotate smoothly Check the fan motor voltage immediately after restart in horizontal position and in cooling mode Is the voltage approx 190V Check capacitor C70 Has its resistance increased Replace the fan motor Replace the fan motor Replace indoor PCB 2 Replace capacitor C70 No No No No
122. ral Problems ESIE98 07 3 20 Part 3 Troubleshooting 3 1 3 4 5 The valve starts to shift but does not complete the reversal The following list explains what the possible causes can be The numbers in the columns refer to the numbers in the drawing refer to page 3 18 1 2 3 4 5 6 Description Hot Warm Warm Warm Temperature of valve body Hot There is not enough pressure differential at start of stroke or not enough flow to maintain the pressure differential To resolve 1 Check the unit for correct operating pressure and charge 2 Raise the head pressure 3 If there is still no shift replace the valve There is body damage Replace the valve Hot Warm Warm Hot Hot Hot Both parts of pilot are still open To resolve 1 Raise the head pressure 2 Operate the solenoid to free the partially clogged port 3 If there is still no shift replace the valve Hot Hot Hot Hot Temperature of valve body Hot There is body damage Replace the valve The valve hung up at mid stroke The pumping volume of the compressor is not sufficient to maintain the reversal To resolve 1 Raise the head pressure 2 Operate the solenoid 3 If there is still no shift replace the valve Hot Hot Hot Hot Hot Hot Both parts of pilot are still open To resolve 1 Raise the head pressure 2 Operate the solenoid to the free partially clogged port 3 If ther
123. roximately 10 of the rated voltage Contact the power company Is the unit still working The unit is in stand by mode and will operate after 3 minutes Is the power cable 2 5 mm2 is it properly connected Connect the correct cable Are the indoor outdoor unit combinations correct Connect matching units Refer to 1 4 Is the signal from the remote controller received by unit Check the batteries in the controller Replace if necessary Are the remote controller and indoor unit set to corresponding addresses Set addresses correctly Refer to 4 5 Is the operation lamp flashing Refer to 3 6 Yes No No No No No No No No Yes Yes Yes Yes Yes Yes Begin Check the power supply voltage Refer to 3 17 and 3 29 in order to troubleshoot the error code on the remote controller or the LED indication on one of the units End Yes and Overview of General Problems ESIE98 07 3 12 Part 3 Troubleshooting 3 1 3 4 5 2 3 Poor Cooling or Heating Effect Possible causes The following list shows the possible causes I Incorrect temperature setting Refer to Test Run amp Operation Data on page 4 7 I Incorrect indoor outdoor unit combination Refer to Technical Specifications on page 1 4 I Clogged air filters I Insufficient capacity I Blockage of air inlet or outlet of the indoor and outdoor unit I The windows and
124. shooting ESIE98 07 3 4 Part 3 Troubleshooting 3 1 3 4 5 1 2 Overview of General Cases No direct operation start The operation does not start directly when I you press the ON OFF button after operation stop I you re select the mode This is to protect the air conditioner You should wait for about 3 minutes No direct hot air After starting the heating operation hot air does not flow out directly You should wait 1 to 4 minutes because the air conditioning is warming up to prevent cold draft Sounds The following table explains the different sorts of sounds Heating operation stops suddenly The heating operation can stop suddenly emitting a flowing sound because the system is defrosting You should wait for about 3 to 8 minutes Water or steam escapes out the outdoor unit The following table explains why water or steam can escape out of the outdoor unit Mist escapes out the indoor unit Mist can come out the indoor unit when the air in the room is cooled into mist by the cold air flow during cooling operation Odour escapes out of the indoor unit An odour can escape out of the indoor unit when smells of the room furniture or cigarettes are absorbed into the unit and discharged with the air flow You should I Clean oil I Change filter I Check drain If the problem is not solved contact your dealer Sounds Explanation flowing sound Refrigerant gas is flowing in the ai
125. stors Check the power supply of outdoor PCB 1 Is the voltage approximately 5 V 0 5V Replace outdoor PCB 1 Switch the power off and on again Does the same LED indication appear again Is it normal Locate the cause of the power supply waveform disturbance and take the necessary measures Switch off the power remove wire 2 of the terminal board Switch on the power again Does LED A flash more than 10 times Replace outdoor PCB 1 Check the connection between the indoor and outdoor unit Check the grounding Is the grounding proper The malfunction may be caused by an external factor rather than defective parts Locate the cause of the noise etc Correct the situation Provide proper grounding Yes No Check the power supply waveform Refer to 3 62 Is it properly connected Correct it Replace indoor PCB 2 No No No No No No No No Yes Yes Yes Yes Yes Yes Yes Yes Begin End ESIE98 07 Additional Checks and Repair for Troubleshooting Part 3 Troubleshooting 3 59 3 4 5 1 Part 3 5 Additional Checks and Repair for Troubleshooting 5 1 What Is in This Chapter Introduction This chapter explains how you have to check the units to execute good troubleshooting Overview This chapter covers the following topics Topic See page 5 2 Checking the Indoor Units page 3 60 5 3 Checking the Outdoo
126. tart dripping Indoor temperature 21 C to 32 C Indoor humidity 80 Items Operating modes If the operation is out of this range Outdoor temperature 10 C to 21 C A safety device may stop the operation Indoor temperature maximum 27 C Items Operating modes If the operation is out of this range Outdoor temperature 18 C to 43 C I A safety device may stop the operation I Condensation may occur on the indoor unit and start dripping Indoor temperature 18 C to 32 C Indoor humidity 80 ESIE98 07 Test Run amp Operation Data Part 4 Commissioning and Test Run 4 9 3 4 5 1 2 3 Operation Range Conditions The graphics below are based on the following conditions I an equivalent piping length of 5 meters I a level difference of 0 meters I an high speed airflow rate Cooling mode The following drawing shows the operation range in cooling mode Heating mode The following drawing shows the operation range in heating mode 50 43 10 15 20 23 28 30 40 30 21 0 10 Outdoor temperature CDB Indoor temperature CWB continuous operation pull down period 20 15 10 7 5 0 10 10 14 20 28 30 Indoor temperature CDB Outdoor temperature CWB continuous operation warming up period Test Run amp Operation Data ESIE98 07 4 10 Part 4 Commissioning and Test Run 3 1 4 5 2
127. the compressor tube to the inside coil tube to the outside coil left pilot back capillary tube right pilot back capillary tube coil bleed hole compressor piston needle pilot body piston body Discharge tube 1 Suction tube 2 Tube to inside coil 3 Tube to outside coil 4 Left pilot back capillary tube 5 Right pilot front capillary tube 6 Hot Cool Cool as in column 2 Hot as in column 1 Temperature of valve body Temperature of valve body Discharge tube 1 Suction tube 2 Tube to inside coil 3 Tube to outside coil 4 Left pilot back capillary tube 5 Right pilot front capillary tube 6 Hot Cool Hot as in column 1 Cool as in column 2 Temperature of valve body Temperature of valve body ESIE98 07 Overview of General Problems Part 3 Troubleshooting 3 19 3 4 5 1 The valve will not shift from cooling to heating The following list explains what the possible causes can be I Check the electrical circuit If there is no voltage to the coil repair it I Check the coil If it is defective replace it I Check the refrigerant charge If the charge is low repair it and recharge the system If the pressure differential is too high recheck the system I Check the following operation conditions to find the cause of the malfunction The numbers in the columns refer to the numbers in the drawing on the previous page 1 2 3 4 5
128. ult code 8 or U4 LED indication The following table shows the LED indication of the indoor unit Error The following table explains the 2 possibilities Causes The following list shows the possible causes I Display disabled by faulty power supply I Faulty signal transmitting receiving circuit in indoor PCB 1 and PCB 2 I The microcomputer program is in abnormal condition due to an external factor such as noise momentary voltage drop momentary power failure etc I Faulty indoor PCB 1 and PCB 2 Condition LED A green LED B green normal 9 9 fault 8 8 Error method Error generation The internal program checks the working of the microcomputer to detect this error The error is generated when the microcomputer program does not function properly During indoor outdoor communication the indoor unit detects the signals coming from the outdoor unit During indoor outdoor communication the error is generated when the indoor unit receives a faulty signal from the outdoor unit Overview of Fault Indications on Indoor Units ESIE98 07 3 32 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troubleshooting procedure Check LED B Is LED B on or off not flashing Replace indoor PCB 1 and indoor PCB 2 Check the power supply voltage Is the power supply voltage 230V AC with a fluctuation of 10 Correct the power supply voltage Ch
129. ump Check whether the drain hole is free Remove dirt A blocked drain results in water leakage Drain pump if installed Check whether the operation of the drain pump is normal Repair it A faulty drain pump results in water leakage Maintenance ESIE98 07 5 6 Part 5 Maintenance 3 1 5 1 4 General Maintenance Check To execute good maintenance proceed as follows Item Check If not Otherwise Pressure voltage current and temperature Compare with previous maintenance resolve the problem It can result in poor operation of the unit ESIE98 07 Appendix Drawings Appendix 1 4 3 4 5 4A Appendix Drawings Introduction In order to find quickly the drawings inserted in this manual appendix B offers a list with all the drawings Drawings table The following table shows the page and description of all the drawings Call outs See page Address switch page 4 5 Automatic air flow control for cooling page 2 19 Automatic air flow control for heating page 2 19 Autoswing Cooling mode page 2 16 Autoswing Heating mode page 2 16 Cleaning the air filters page 3 69 Cooling mode page 4 9 Current transformer check page 3 62 Dry mode page 2 21 Emergency button page 3 6 Functional diagram indoor unit page 1 10 Functional diagram outdoor unit page 1 11 Heating mode page 4 9 Location of thermistors page 2 4 Indoor unit
130. x Refer to Index Usage of the manual The present service manual gives you all the information you need to do the necessary repair and maintenance tasks for the Split Inverter room air conditioners It is intended for and should only be used by qualified engineers It is not intended to replace the technical know how acquired through training and experience Using icons Icons are used to attract your attention to specific information The meaning of each icon is described in the table below Icon Type of information Description Note A note provides information that is not indispensable but may nevertheless be valuable to you such as tips and tricks Caution A caution is used when there is danger that you through incorrect manipulation may damage equipment loose data get an unexpected result or have to restart part of a procedure Warning A warning is used when there is danger of personal injury Reference A reference guides you to other places in this binder or in this manual where you will find additional information on a specific topic Introduction ESIE98 07 vi 3 1 4 5 Using symbols The following symbols are used to clarify the troubleshooting part Symbol Description 5 LED is off 0 LED is on 9 Flashing LED 8 Varies depending on the cases _ Not used for troubleshooting ESIE98 07 Part 1 System Outline 1 1 3 4 5 1 3 Part
131. x thermistor R4T Error generation During compressor s non operating period the error is generated when the radiation switch box thermistor temperature reaches 80 C Causes The following list shows the possible causes I Electrical box temperature rise due to outdoor fan malfunctioning I Electrical box temperature rise due to short circuit I Detection error due to faulty radiation switch box thermistor R4T I Detection error due to faulty connector connection I Detection error due to faulty outdoor PCB 1 Condition LED A green LED 1 red LED 2 red LED 3 red LED 4 red normal 9 8 8 8 8 fault 9 0 0 8 0 Overview of Fault Indications on Outdoor Units ESIE98 07 3 54 Part 3 Troubleshooting 3 1 3 4 5 Procedure The following flow chart shows the troubleshooting procedure Switch the power off and on again Does the error occur again Check the radiation switch box thermistor R4T Refer to 3 61 thermistor R4T abnormal Replace fin thermistor R4T Is the fin temperature higher than 80 C or the electrical box temperature Check the looseness of the power transistor TRM1 and fin installation If they are securely mounted replace outdoor PCB 1 Check the outdoor fan rotation Is it rotating Check the outdoor fan voltage Is it different from 230 V Replace outdoor PCB 2 Check the conductivity of the fan capacitor C82 Is ther
132. xecute a test run make sure that following points are checked Checkpoints Otherwise Is the unit securely installed Are all air inlets and outlets of the indoor and outdoor units unobstructed Poor cooling Poor heating Does the drain flow out smoothly Water leakage Is the piping adequately heat insulated Water leakage Have the connections been checked for gas leakage Poor cooling Poor heating Is the supply voltage conform to the specifications on the name plate Incorrect operation Is the earth wire installed according to the applicable local standard Dangerous if electric leakage occurs Is the earth wire earthed Damage of cables Are the cable sizes as specified Damage of cables Are the remote controller signals received by the unit No operation ESIE98 07 Pre Test Run Checks Part 4 Commissioning and Test Run 4 5 3 4 5 1 1 3 Setting the Remote Controller Address switch The address switch is used when one or two indoor units are installed in one room I one indoor unit address switch set to 1 I two indoor units in one room address switch set to 2 Make sure to set the address switch on PCB 1 of the indoor unit Refer to Main board PCB 1 on page 1 17 Drawing The following drawing shows the location of the address switch address switch Pre Test Run Checks ESIE98 07 4 6 Part 4 Commissioning and Test Run 3 1 4 5 ES

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