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Mitsubishi Heavy Industries KXZ series Service Manual
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Mitsubishi Heavy Industries KXZ series Service Manual

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SERVICE MANUAL
VRF INVERTER MULTI-SYSTEM AIR-CONDITIONERS
(OUTDOOR UNIT)
KXZ series
FDC112KXZEN1, 140KXZEN1, 155KXZEN1 (1 Phase)
FDC112KXZES1, 140KXZES1, 155KXZES1 (3 Phase)
Note:
•
(1) Regarding the Indoor unit series, refer to the No. '15 • KX-T-247, '17 • KX-T-254 and '17 • KX-T-264.
(Heat pump type)
Manual No. '17 • KX-SM-272
updated March 08, 2018

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  • Page 1 Manual No. ‘17 • KX-SM-272 updated March 08, 2018 SERVICE MANUAL VRF INVERTER MULTI-SYSTEM AIR-CONDITIONERS (OUTDOOR UNIT) KXZ series (Heat pump type) FDC112KXZEN1, 140KXZEN1, 155KXZEN1 (1 Phase) FDC112KXZES1, 140KXZES1, 155KXZES1 (3 Phase) Note: • (1) Regarding the Indoor unit series, refer to the No. ’15 • KX-T-247, ’17 • KX-T-254 and ’17 • KX-T-264.
  • Page 2 '17 • KX-SM-272 CONTENTS 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ..... 1 1.1 Remote control (Option parts) ..............1 1.2 Operation control function by the wired remote control ......4 1.3 Operation control function by the indoor control ........9 1.4 Operation control function by the outdoor control ........
  • Page 3 '16 • PAC-T-251 '17 • KX-SM-272 1.10 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1.10.1 Remote control 1.1 Remote control (Option parts) Wired remote control Wired remote control Model RC-EX3 Model RC-EX3 ⑤ LCD (With backlight) ③...
  • Page 4 '17 • KX-SM-272 Wired remote control Model RC-E5 The figure below shows the remote control with the cover opened. Note that all the items that may be displayed in the liquid crystal display area are shown in the figure for the sake of explanation. Characters displayed with dots in the liquid crystal display area are abbreviated.
  • Page 5 '17 • KX-SM-272 Wireless remote control Indication section Indicates set temperature. Indicates the status of swing louver. Indicates selected operation with Indicates the selected air flow volume Indicates for two seconds when FILTER button is pressed. Indicates when ON-TIMER is set. Indicates when OFF-TIMER is set.
  • Page 6 '16 • PAC-T-251 '17 • KX-SM-272 1.10.2 Operation control function by the wired remote control 1.2 Operation control function by the wired remote control ●Model RC-EX3 (1) Switching sequence of the operation mode switches of remote control (a) Tap the change operation mode button on the TOP screen. (b) When the change operation mode screen is displayed, tap the button of desired mode.
  • Page 7 '16 • PAC-T-251 '17 • KX-SM-272 ●Content memorized with the power failure compensation are as follows. Note(1) Items (f) and (g) are memorized regardless whether the power failure compensation is effective or not while the setting of silent mode is cancelled regardless whether the power failure compensation is effective or not.
  • Page 8 '17 • KX-SM-272 Operation and setting from remote control A : Refer to the instruction manual for RC-EX series ○：Nearly same function setting and operations are possible. B : Refer to the installation manual for RC-EX series △：Similar function setting and opperations are possible. C : Loading a utility software vie Internet Setting ＆...
  • Page 9 '17 • KX-SM-272 Setting ＆ display item Description RC-EX3 RC-E5 2 Administrator settings R/C display setting Register [Room name] [Name of I/U] Display [Indoor temp. display] or not. △ [Administrator password] Display [Error code display] or not. Display [Heating stand-by display] [Defrost operation display] [Auto cooling/heating display] [Display temp of R/C, Room, Outdoor] or not The administrator password can be changed.
  • Page 10 '16 • PAC-T-251 '17 • KX-SM-272 ●Model RC-E5 Switching sequence of the operation mode switches of remote control COOL HEAT AUTO CPU reset This functions when “CHECK” and “ESP” buttons on the remote control are pressed simultaneously. Operation is same as that of the power source reset.
  • Page 11 '17 • KX-SM-272 1.3 Operation control function by the indoor control Operations of functional items during cooling/heating Cooling Heating Operation Dehumidifying Thermostat Thermostat Thermostat Thermostat Hot start (Defrost) Functional item Compressor 4-way valve Outdoor unit fan Indoor unit fan Thermostat ON: Drain pump Thermostat OFF: Notes (1)
  • Page 12 '17 • KX-SM-272 (vii) Combination of patterns which can be set for the timer operations Weekly timer Sleep time Set OFF timer by hour Set ON timer by hour Set OFF timer by clock Set ON timer by clock Sleep time Set OFF timer by hour Set ON timer by hour Set OFF timer by clock...
  • Page 13 '17 • KX-SM-272 Thermostat ON i) When the heat exchanger thermistor (Thi-R1 or R2, whichever higher) detects 25°C or lower, the fan is turned OFF and does not operate. ii) When the heat exchanger thermistor (Thi-R1 or R2, whichever higher) detects 25°C or higher, the fan operates with the fan control at heating thermostat OFF.
  • Page 14 '17 • KX-SM-272 (b) RC-E5 (i) Louver control Press the “LOUVER” button to operate the swing louver when the air-conditioner is operating. “SWING ” is displayed for 3 seconds and then the swing louver moves up and down continuously. To fix the swing louver at a position, press one time the “LOUVER” button while the swing louver is moving so that four stop positions are displayed one after another per second.
  • Page 15 '17 • KX-SM-272 (iii) Thermostat is turned ON when the room temperature is in the range of -1 < Set point < +1 at the start of cooling opera- tion (including from cooling to heating). (c) Fan control during heating thermostat OFF (i) Following fan controls during the heating thermostat OFF can be selected with the indoor function setting of the wired remote control.
  • Page 16 '17 • KX-SM-272 Filter sign As the operation time (Total ON time of ON/OFF switch) accumulates to 180 hours , “FILTER CLEANING” is displayed on the remote control. (This is displayed when the unit is in trouble and under the central control, regardless of ON/OFF) Notes (1) Time setting for the filter sign can be made as shown below using the indoor function of wired remote control “FILTER SIGN SET”.
  • Page 17 '17 • KX-SM-272 (12) Drain pump abnormalities detection Drain detection switch is turned ON or OFF with the float switch (FS) and the timer. Drain detection switch ON Normal state Normal state [*1] [*2] [ ＊ 1] Drain detection switch is turned “ON” when the float switch “Open” is detected for 3 seconds continuously in the drain detectable space.
  • Page 18 '17 • KX-SM-272 (15) Anomalous fan motor After starting the fan motor, if the fan motor speed is 200min or less is detected for 30 seconds continuously and 4 times within 60 minutes, then fan motor stops with the anomalous stop (E16). (b) If the fan motor fails to reach at -50 min less than the required speed, it stops with the anomalous stop (E20).
  • Page 19 '17 • KX-SM-272 Reference: Explanation on the codes and the combinations of codes in the table above 1. In case of CnT “Number”, the CnT “Number” is adopted and CnTA is invalidated. 2. In case of CnTA “Number”, the CnTA “Number” is adopted and CnT is invalidated. 3.
  • Page 20 '17 • KX-SM-272 (19) Operation permission/prohibition (In case of adopting card key switches or commercially available timers) When the indoor function setting of wired remote control for “Operation permission/prohibition” is changed from “Invalid (Factory default)” to “ Valid”, following control becomes effective. ・...
  • Page 21 '17 • KX-SM-272 (b) In case of CnT ③ Operation permission/prohibition level + CnTA ③ Operation permission/prohibition level Operation permission Operation permission Operation Operation permission prohibition prohibition setting Operation CnTA Operation permission permission Operation Operation permission/ prohibition prohibition setting Operation Operation permission permission Operation permission/...
  • Page 22 '17 • KX-SM-272 (20) Selection of cooling/heating external input function When “External input 1 setting: Cooling/heating” is set for the indoor unit function from remote control, the cooling or heating is selected with CnT-6 or CnTA. (b) When the External input 1 method selection: Level input is set for the indoor unit function: ・...
  • Page 23 '17 • KX-SM-272 (23) High power operation (RC-EX3 only) It operates at with the setting temperature fixed at 16°C for cooling, 30°C for heating and maximum indoor fan speed for 15 minutes maximum. (24) Energy-saving operation (RC-EX3 only) It operates with the setting temperature fixed at 28°C for cooling, 22°C for heating or 25°C for auto. (Maximum capacity is restricted at 80%.) (25) Warm-up control (RC-EX3 only) Operation will be started 5 to 60 minutes before use according to the forecast made by the microcomputer which calculates...
  • Page 24 '17 • KX-SM-272 (31) Indoor unit overload alarm (RC-EX3 only) If the following condition is satisfied at 30 minutes after starting operation, RC-EX3 shows maintenance code "M07" and the signal is transmitted to the external output (CnT-5). (a) Receipt of the signal by the external output is indicated by lighting an LED or other prepared on site. ・...
  • Page 25 '17 • KX-SM-272 1.4 Operation control function by the outdoor control (A) Normal control Operation of major functional components under each operation mode Cooling/Dehumidifying Heating Operation mode Compressor Compressor All stop by Compressor Compressor All stop by Functional components remote control remote control Magnetic contactor for compressor (52C1)
  • Page 26 '17 • KX-SM-272 (c) Fan control during heating During heating, fan speed is controlled in accordance with the low pressure (sensed by PSL). Initial fan speeds are as follows. • Outdoor fan initial speed during heating Model Speed All models 6th speed (ii) During normal operation, the speed is changed in accordance with the low pressure value.
  • Page 27 '17 • KX-SM-272 Protective control (a) Discharge pipe temperature control If the discharge pipe temperature exceeds 105°C, compressor speed is reduced to suppress the rising of discharge pipe temperature. If the discharge pipe temperature sensor detects 115°C or higher for 2 seconds continuously, it makes compressor stopped.
  • Page 28 '17 • KX-SM-272 • Current safe setting value Current safe value [A] Inverter primary (T-phase) current Inverter secondary current Power source Cooling Cooling Heating Heating Zone A Zone B Zone C Zone D Zone A Zone B Zone C Zone D 1-phase 3-phase 13.5...
  • Page 29 '17 • KX-SM-272 (B) Option controls Outdoor unit control settings can be changed with the dip switch and 7-segment display Pxx setting on the PCB. In changing settings in Pxx on the 7-segment display panel, you can use SW8 (increasing a number shown on the 7-segment display panel: one’s place), SW9 (increasing a number shown on the 7-segment display panel: tens place) and SW7 (data write/enter) by pressing them for a prolonged time.
  • Page 30 '17 • KX-SM-272 External input and demand input (a) Operation permission and prohibition modes (Note) With 7-segment display [P07]-[0] Operation permission or operation prohibition mode is switched with the connector (CnS1) and the jumper wire (J13) on the outdoor PCB. J13: Switching of CnS1 input method J13 short-circuited: CnS1 is for the level input.
  • Page 31 '17 • KX-SM-272 Operation/ stop control by the demand input CnS1 of outdoor unit CnS1: Switching of demand control/ Input: CnS1 Switching with J13 normal operation Short-circuit Demand control Short-circuit (Level input)  Normal operation Switching of normal operation/ Open (Pulse input) Open demand control (Reversal) Short-circuit...
  • Page 32 '17 • KX-SM-272 Silent mode control (Note) With 7-segment display [P07]-[3] for silent mode 1 or with 7-segment display [P07]-[8] for silent mode 2 (a) Starting conditions When all the followings are satisfied When the strat command of silent mode input from indoor unit or from external input terminal of outdoor unit has become effective.
  • Page 33 '17 • KX-SM-272 Outdoor fan snow protection control (a) This control is enabled/disabled by entering data into 7-segment display. (b) Outdoor fan control switching operation [Starting conditions] When following conditions are established for 10 minutes continuously. (i) Snow protection control setting is valid ([P02]=1) and ambient air temperature < 3°C or external input of outdoor fan snow protection control ON.
  • Page 34 '17 • KX-SM-272 Energy saving mode control This control is effective, when [P04] of 7-segment display is set 000, 040, 060, 080 (except OFF) (a) Control contents Compressor upper limit speed is changed according to the setting ratio. (ii) Compressor upper limit speed is obtained by multiplying the rating speed (at cooling/heating) with the setting ratio as follows.
  • Page 35 '17 • KX-SM-272 Pump down operation control at removal of unit When an outdoor unit is discarded or removed, the pump down control is performed at the outdoor unit side in order to recover the refrigerant quickly to the outdoor unit. (a) Starting conditions This is implemented with the liquid service valve closed.
  • Page 36 '17 • KX-SM-272 Pump-down operation by external input If an error stop is raised by an external input by refrigerant leaking alarm unit, the pump-down operation is performed at the outdoor unit side in order to prevent the refrigerant from leaking. They are local arrangements.
  • Page 37 '17 • KX-SM-272 (C) Data output 7-segment and operation data retention (a) 7-segment display Operation information is displayed for checking various operation data during test run and for helping malfunction diagnosis at servicing. Input data to microcomputer, contents of outdoor unit control, indoor unit registration information, or other, are mainly displayed on the 7-segment LED.
  • Page 38 '17 • KX-SM-272 (ii) When the temperature is below -10.0°C for the display of discharge pressure saturated temperature and suction pressure saturated temperature, the fraction after decimal point is rounded up. (Because the range of 7-segment display is 3-digit.) (iii) Precedence of display [Exx] >...
  • Page 39 '17 • KX-SM-272 (b) List of 7-segment displays Code No. Contents of display Data display range Minimum unit Remarks Error display [Exx] Caution [oPx] display [PdS][PdE][CHx][CHE] Special display [CHL][CHU][CHJ][CHO] and etc. Code No. Contents of data display Data display range Minimum unit Remarks <Sensor value, actuator information>...
  • Page 40 '17 • KX-SM-272 Code Minimum Contents of data display Data display range Remarks unit Order of 100: 63H1-1 C30 Pressure switch – Order of 10: (Spare) 63H1-R (0: Close, 1: Open) Order of 1: (Spare) Order of 100: CnS1 C31 External input –...
  • Page 41 '17 • KX-SM-272 Code Minimum Contents of data display Data display range Remarks unit C56 Target Fk 0 - 999 C57 Inverter 1 operation frequency command 0 - 130 (Spare) Inverter 2 operation frequency 0 - 130 command C59 FMo1 Fan Speed command 0 - 999 10min C60 (Spare) FMo2 Fan Speed command...
  • Page 42 '17 • KX-SM-272 Code Minimum Contents of data display Data display range Remarks unit <Anomalous counter information> C70 Counter · Sensor wire disconnected 0 - 3 C71 Counter · High pressure protection 0 - 5 Counter · Anomalous low pressure ➂ (During 0 - 5 operation) C73 Counter ·...
  • Page 43 '17 • KX-SM-272 Code Minimum Contents of data display Data display range Remarks unit <User setting> P00 (Spare) – – – – – 0 : (Factory default) 0: First push preference (Factory default) P01 Operation preference switching – 1: Last push preference 0: Outdoor fan snow protection control invalid 0 : (Factory default) P02 Outdoor fan snow protection control...
  • Page 44 '17 • KX-SM-272 Code Minimum Contents of data display Data display range Remarks unit <New Superlink setting> Superlink communication 0: Current Superlink – satus 1: New Superlink 0 : (Factory default) 0: Automatic address setting standby. P31 Start automatic address setting –...
  • Page 45 '17 • KX-SM-272 (c) Saving of Operation Data Mainly for investigating causes of market claims, operation data are always saved in memory. If any trouble occurs, the data writing is stopped and only the operation data prior to the time when the trouble occurs are recorded. These data can be loaded to a PC via RS-232C connector of PCB and utilized for identifying causes.
  • Page 46 '17 • KX-SM-272 Code Record data Number of Write contents Unit of write Contents Data write range bytes 00: No error on outdoor unit Error code 00 - 99 – 01-99: All errors 00 – 3F: Outdoor Error existing unit address 00 - FF –...
  • Page 47 '17 • KX-SM-272 Code Record data Unit of Number of Write contents Contents Data write range write bytes FM01 Fan speed command 0 - 65535 10min (Spare) FMo2 Fan speed 0 - 65535 10min command EEVH1 opening degree 0 - 65535 1 pulse EEVSC opening degree 0 - 65535...
  • Page 48 '17 • KX-SM-272 Code Record data Unit of Number of Write contents Contents Data write range write bytes Dip switch [SW6] – – Bit0 (Spare) SW6-1 0 : OFF, 1 : ON Bit1 (Spare) SW6-2 0 : OFF, 1 : ON Bit2 (Spare) SW6-3 0 : OFF, 1 : ON...
  • Page 49 '17 • KX-SM-272 Code Record data Unit of Number of Write contents Contents Data write range write bytes <Control status> Control status 0 - 2 – None Oil return Oil return ON Control status 0 - 3 – None Defrost condition Temperature condition Time condition Control status...
  • Page 50 '17 • KX-SM-272 Code Record data Unit of Number Write contents Contents Data write range write of bytes <Protection control status> Protection control HP protection 1 Bit0 0: Normal, 1: Implementing Status 1 Compressor capacity control HP protection 2 ( *1) Bit1 0: Normal, 1: Implementing Indoor EEV minimal opening...
  • Page 51 '17 • KX-SM-272 Code Record data Unit of Number of Write contents Contents Data write range write bytes <Error counter information> Control status HP (63H1) anomaly counter 0 - 5 Control status LP anomaly counter while 0 - 5 running Control status LP anomaly counter while 0 - 5 stopping...
  • Page 52 '17 • KX-SM-272 Code Record data Unit of Number Write contents Contents Data write range write of bytes <Other> Override number – <Indoor unit information> Bit0 Bit1 Bit2 Bit3 Bit4 (Spare) Bit5 (Spare) Bit6 (Spare) Bit7 (Spare) Registered indoor 1 – 8 operation 0 - 4 –...
  • Page 53 '17 • KX-SM-272 Code Record data Unit of Number Write contents Contents Data write range write of bytes <Piping washing operation information> 0 - 7 – 112 Registered indoor 1 – 8 – – Bit0 Indoor 1 unmatch check error 0 : OFF, 1 : ON unmatch check error Bit1...
  • Page 54 '17 • KX-SM-272 (2) Outdoor PCB setting Code Input Remarks Outdoor address No. (Order of 10) Outdoor address No. (Order of 1) Inspection LED reset SW3-1 Forced heating/cooling SW3-7 Test run switch SW5-1 Test run Heating/Cooling SW5-2 Pump down switch SW5-3 Data erase/Write 7-segment display code No.
  • Page 55 '17 • KX-SM-272 2. SYSTEM TROUBLESHOOTING PROCEDURE 2.1 Basics of troubleshooting Basic troubleshooting is to check/analyze/save data by connecting the Mente PC. Whenever arriving at the site, always connect the Mente PC before starting work. Method of error data analysis (Basic procedure) •...
  • Page 56 '17 • KX-SM-272 2.2 Explanation of troubleshooting (a) Checking DC15V on the control PCB (Step to check if the inverter PCB fails or not) Use this to diagnose E41, E42, E45 and E48. Power OFF (Power source circuit breaker OFF) Fan motor check *Be sure to check both fan motor 1 and 2 Be sure to wait for 3 minutes after turning the...
  • Page 57 '17 • KX-SM-272 2.3 Contents of troubleshooting List of inspection displays Indoor and outdoor units Remote 7-segment control Name of inspection Classification Page display error code – Remote control communication error Communication error – Duplicated indoor unit address Address setting error Address pairing –...
  • Page 58 '17 • KX-SM-272 Troubleshooting Green Error code Content Keeps flashing Stays OFF Indoor None Remote control: Operates but does not cool 7-segment display: – Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor fan operation. Check the temperature difference between return and suction air of indoor unit.
  • Page 59 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays OFF Indoor Remote control: None Operates but does not heat 7-segment display: – Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor fan operation. Check the temperature difference between return and suction air of indoor unit.
  • Page 60 '17 • KX-SM-272 Green Content Error code Stays OFF Stays OFF Stays OFF Indoor Remote control: None Earth leakage breaker activated 7-segment display: – Stays OFF Stays OFF Outdoor Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are the insulation resistance Replace compressor.
  • Page 61 '17 • KX-SM-272 Green Error code Content – – Indoor Remote control: None Excessive noise/vibration (1/3) 7-segment display: – – – Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure If excessive noise/vibration persists when sufficient time has elapsed after Does noise/ vibration occur during stopping the unit, it is...
  • Page 62 '17 • KX-SM-272 Green Error code Content – – Indoor Remote control: None Excessive noise/vibration (2/3) 7-segment display: – – – Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure From previous page Rearrange the piping to Are the pipes avoid contact with the contacting with the casing.
  • Page 63 '17 • KX-SM-272 Green Error code Content – – Indoor Remote control: None Excessive noise/vibration (3/3) 7-segment display: – – – Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure From previous page If insufficient cooling/ [Adjustment heating problem happens during commissioning] due to anomalous operating Does noise/vibration occur when the...
  • Page 64 '17 • KX-SM-272 Green Error code Content Louver motor failure Keeps flashing Stays OFF Indoor Remote control: None 7-segment display: – Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure L Check at the indoor unit side. Operate after waiting for more than 1 minute.
  • Page 65 '17 • KX-SM-272 Green Error code Content Power source system anomaly Stays OFF Stays OFF Indoor Remote control: None (Power source to indoor unit PCB) 7-segment display: Stays OFF 2-time flash Outdoor 5. Troubleshooting 1. Applicable model FDT, FDK series only Diagnosis Countermeasure AC 220-240V...
  • Page 66 '17 • KX-SM-272 Green Error code Content Power source system anomaly Stays OFF Stays OFF Indoor Remote control: None (Power source to indoor unit PCB) 7-segment display: Stays OFF 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Except FDT, FDK series Diagnosis Countermeasure AC 220-240V...
  • Page 67 '17 • KX-SM-272 Green Error code Content Power source system error Keeps flashing Stays OFF Indoor Remote control: None (Power source to remote control) 7-segment display: Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model FDT, FDK series only Diagnosis Countermeasure Is the connection of the...
  • Page 68 '17 • KX-SM-272 Green Error code Content Power source system error Keeps lighting Stays OFF Indoor Remote control: None (Power source to remote control) 7-segment display: Keeps lighting 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Except FDT, FDK series Diagnosis Countermeasure Isn't there any...
  • Page 69 '17 • KX-SM-272 Green Error code Content WAIT Keeps flashing Stays OFF Indoor Remote control: WAIT 7-segment display: Keeps flashing Keeps flashing Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (In case that is kept WAIT on displaying on the remote control for more than 2 minutes is kept on WAIT...
  • Page 70 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays OFF Indoor Remote control: WAIT WAIT 7-segment display: Keeps flashing Keeps flashing Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (In case of fuse blown, how to check the unit before replacement of fuse) Isn't there any short circuit...
  • Page 71 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays OFF Indoor Remote control: WAIT WAIT 7-segment display: Keeps flashing Keeps flashing Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (No display on the remote control after power ON) No display on the remote control after power ON.
  • Page 72 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays OFF Indoor Remote control: WAIT WAIT 7-segment display: Keeps flashing Keeps flashing Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (In case that is kept WAIT on displaying on the remote control for more than 2 minutes is kept on WAIT...
  • Page 73 '17 • KX-SM-272 Green Error code Content Stays OFF Stays OFF Indoor Remote control: WAIT WAIT 7-segment display: Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (In case that LED on outdoor control PCB stays OFF) In case that LED on outdoor control PCB stays From previous page...
  • Page 74 '17 • KX-SM-272 Green Error code Content Stays OFF Stays OFF Indoor Remote control: WAIT WAIT 7-segment display: Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (In case of fuse blown, how to check the unit before replacement of fuse) From previous page Isn't...
  • Page 75 '17 • KX-SM-272 Green Error code Content Stays OFF Stays OFF Indoor Remote control: [No display] [No display] 7-segment display: Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (No display on the remote control after power ON) No display on the remote control after power ON Is DC10V...
  • Page 76 '17 • KX-SM-272 Green Error code Content Remote control Keeps flashing Stays Off Indoor Remote control: communication error 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Malfunction by noise Is it possible to Check peripheral reset normally by the power environment.
  • Page 77 '17 • KX-SM-272 Green Error code Content Keeps flashing Keeps flashing Indoor Remote control: Duplicated indoor unit address 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the number of Review number of connected indoor units up connected units.
  • Page 78 '17 • KX-SM-272 Green Error code Content Keeps flashing 2 times flash Indoor Remote control: E3/5 Outdoor unit signal line error 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure E3 is a communication error that occurs when communication is not established at all between indoor/outdoor units.
  • Page 79 '17 • KX-SM-272 Green Error code Content Keeps flashing *See below Indoor Remote control: Communication error during operation 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure * In case of 2 times flash on indoor red LED Note (1) Check faulty connections (disconnection, looseness) on the outdoor unit terminal block.
  • Page 80 '17 • KX-SM-272 Green Error code Content Indoor heat exchanger Keeps flashing 1 time flash Indoor Remote control: temperature thermistor anomaly 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the connection of indoor heat Correct.
  • Page 81 '17 • KX-SM-272 Green Error code Content Keeps flashing 1 time flash Indoor Remote control: Intake air temperature thermistor anomaly 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the connection of intake air Correct.
  • Page 82 '17 • KX-SM-272 Green Error code Content Keeps flashing 1 time flash Indoor Remote control: Drain trouble 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model FDT, FDTC, FDTW, FDTQ, Diagnosis Countermeasure FDTS, FDU, FDUM, FDUT and FDQS Check the error data in the remote control.
  • Page 83 '17 • KX-SM-272 Green Error code Content Excessive number of indoor units (moe than 17 units) Keeps flashing Stays Off Indoor Remote control: by controlling with one remoto control 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...
  • Page 84 '17 • KX-SM-272 Green Error code Content Address setting error Keeps flashing 1 time flash Indoor Remote control: by mixed setting method 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Isn't the auto setting and the Review address setting.
  • Page 85 '17 • KX-SM-272 Green Error code Content Indoor fan motor anomaly Keeps flashing 1 time flash Indoor Remote control: (In case of FDT) 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model FDT type Diagnosis Countermeasure Does any foreign material intervene Remove foreign material.
  • Page 86 '17 • KX-SM-272 Green Error code Content Indoor fan motor anomaly Keeps flashing 1 time flash Indoor Remote control: (In case of FDK) 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model FDK type Diagnosis Countermeasure Does any foreign material intervene Remove foreign material.
  • Page 87 '17 • KX-SM-272 Green Error code Content Indoor unit operation check, Keeps flashing 1 time flash Indoor Remote control: drain motor check setting error 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure E19 occurs when the power ON.
  • Page 88 '17 • KX-SM-272 Green Error code Content Remote control Keeps flashing Stays Off Indoor Remote control: temperature thermistor anomaly 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the remote Correct. control temperature thermistor connected properly? 2.
  • Page 89 '17 • KX-SM-272 Green Error code Content Unmatch connection of Keeps flashing Stays Off Indoor Remote control: indoor and outdoor unit 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure the signal wire connection between Correct signal wiring.
  • Page 90 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Duplicated outdoor unit address No. 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 91 '17 • KX-SM-272 Green Error code Content Open L3 Phase on Keeps flashing Stays Off Indoor Remote control: power source at primary side 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 92 '17 • KX-SM-272 Green Error code Content Discharge pipe temperature Keeps flashing Stays Off Indoor Remote control: error (Tho-D1) 7-segment display: E36-1 Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 93 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Liqiud flooding anomaly 7-segment display: E36-3 Keeps flashing 3 times flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 94 '17 • KX-SM-272 Green Error code Content Outdoor heat exchanger and sub-cooling Keeps flashing Stays Off Indoor Remote control: coil temperature thermistor anomaly 7-segment display: E37-1, 2, 5, 6*1 Keeps flashing Outdoor *1 Tho-R1: one time flash (E37-1), Tho-R2: two times flash (E37-2), Tho-SC: 5 times flash (E37-5), Tho-H: 6times flash (E37-6) 5.
  • Page 95 '17 • KX-SM-272 Green Error code Content Ambient air temperature Keeps flashing Stays Off Indoor Remote control: thermistor anomaly (Tho-A) 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 96 '17 • KX-SM-272 Green Error code Content Discharge pipe temperature Keeps flashing Stays Off Indoor Remote control: thermistor anomaly (Tho-D1) 7-segment display: E39-1 Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 97 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays Off Indoor Remote control: High pressure error (63H1-1 activated) 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 98 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Current cut (1) 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Is the Check power source. power source voltage OK? 2.
  • Page 99 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Current cut (2) 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Continue from previous page Is the checked result of Replace inverter PCB.
  • Page 100 '17 • KX-SM-272 Green Error code Content Excessive number of indoor units connected, Keeps flashing Stays Off Indoor Remote control: excessive total capacity of connection 7-segment display: E43-1, 2 *1 Keeps flashing Stays Off*1 Outdoor *1 E43-1/1 time flash: Excessive number of indoor units connected, E43-2/2 times flash:Excessive capacity of connection 5.
  • Page 101 '17 • KX-SM-272 Green Error code Content Communication error between Keeps flashing Stays Off Indoor Remote control: inverter PCB and outdoor control PCB 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of Save data for 30 minutes before stopping in Mente PC.
  • Page 102 '17 • KX-SM-272 Green Error code Content Mixed address setting methods Keeps flashing Stays Off Indoor Remote control: coexistent in same network. 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 103 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Outdoor DC fan motor anomaly 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating conditions.
  • Page 104 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Low pressure error 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 105 '17 • KX-SM-272 Green Error code Content Suction pipe temperature thermistor anomaly (Tho-S), Keeps flashing Stays Off Indoor Remote control: E53/E55*1 7-segment display: E53/E55-1 Under-dome temperature thermistor anomaly (Tho-C1) Keeps flashing 1 time flash Outdoor *1 E53: Error for (Tho-S), E55: Error for Tho-C1 5.
  • Page 106 '17 • KX-SM-272 Green Error code Content High pressure sensor/ Keeps flashing Stays Off Indoor Remote control: Low pressure sensor anomaly 7-segment display: E54-1, 2 *1 Keeps flashing Stays Off*1 Outdoor *1 E54-1/1 time flash: Low pressure sensor anomaly, E54-2/2 times flash: High pressure sensor anomaly 5.
  • Page 107 '17 • KX-SM-272 Green Error code Content Power transitor temperature Keeps flashing Stays Off Indoor Remote control: thermistor anomaly (Tho-P1, Tho-P2) 7-segment display: E56-1, 2 *1 Keeps flashing Stays Off*1 Outdoor *1 E56-1/1 time flash:Tho-P1 anomaly, E56-2/2 times flash: Tho-P2 anomaly 5.
  • Page 108 '17 • KX-SM-272 Green Error code Content Anomalous compressor Keeps flashing Stays Off Indoor Remote control: by loss of synchronism 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 109 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Compressor startup failure 7-segment display: Keeps flashing 5 times flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of Save data for 30 minutes before stoopping in Mente PC.
  • Page 110 '17 • KX-SM-272 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Emergency stop 7-segment display: Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Indoor unit Diagnosis Countermeasure Check and save the data of operating condition. Save data for 30 minutes before stopping in Mente PC.
  • Page 111 '17 • KX-SM-272 2.4 Outdoor unit control PCB replacement procedure Control PCB Precautions for safety • Since the following precaution is the important contents for safety, be sure to observe them. WARNING and CAUTION are described as follows: Indicates an imminently hazardous situation which will result in death or serious injury if proper WARNING safety procedures and instructions are not adhered to.
  • Page 112 '17 • KX-SM-272 Inverter PCB FDC112, 140, 155KXZEN1 model Exchange the PCB after elapsing 3 minutes from power OFF. (Be sure to measure voltage (DC) on both capacitor terminals located in control back, and check that the voltage is discharged sufficiently.(Refer to Fig.2)) Take off the connection of inverter PCB terminal block connector and remove the screw of power transistor then remove the PCB.
  • Page 113 '17 • KX-SM-272 FDC112, 140, 155KXZES1 model Exchange the PCB after elapsing 3 minutes from power OFF. (Be sure to measure voltage (DC) on both capacitor terminals located in control back, and check that the voltage is discharged sufficiently.(Refer to Fig.2)) Take off the connection of inverter PCB terminal block connector and remove the screw of power transistor then remove the PCB.
  • Page 114 '17 • KX-SM-272 ■ Function of dip switch for contol (SW3, 4, 5) • SW3 (Function setting) • SW4 (Model selection) Model Switch Function FDC112KXZE1 FDC140KXZE1 FDC155KXZE1 Switch Inspection LED reset SW4-1 SW3-1 Normal SW4-2 Check operation start SW3-5 Normal • SW4 (Overseas) Forced cooling/heating Model All models...
  • Page 115 '17 • KX-SM-272 Inverter checker for diagnosis of inverter output Checking method (a) Setup procedure of checker. 1) Power OFF (Turn off the breaker). 2) Remove the terminal cover of compressor and disconnect the wires (U, V, W) from compressor. 3) Connect the wires U (Red) , V (White) and W (Black) of checker to the terminal of disconnected wires (U, V, W) from compressor respectively.
  • Page 116 '17 • KX-SM-272 3. ELECTRICAL WIRING Models FDC112KXZEN1, 140KXZEN1, 155KXZEN1 – –...
  • Page 117 '17 • KX-SM-272 Models FDC112KXZES1, 140KXZES1, 155KXZES1 – –...
  • Page 118 '17 • KX-SM-272 4. PIPING SYSTEM All models – –...
  • Page 119 '17 • KX-SM-272 5. INSTALLATION OF OUTDOOR UNIT ◎This manual describes outdoor unit installation work. Outdoor unit capacity PSB012D926R ◎For indoor unit installation and electrical cabling, please refer to the Designed for R410A refrigerant indoor unit installation manual and the installation guide. FDC112-155 ◎When install the unit, be sure to check whether the selection of installation place, power source specifications, usage limitation (piping length, height...
  • Page 120 RC－E5 （ 2 cores） 1 - 10 ※ 1 - 10 ※ 1 - 8 Number of connectable units FD○△△KXE6 KXZ Series indoor unit RC－E4 （ 2 cores） 112 - 210 124 - 232 90 - 168 Total capacity of indoor units RC－E3 （...
  • Page 121 '17 • KX-SM-272 Take particular care in carrying in or moving the unit, and always perform 3. UNIT DELIVERY AND INSTALLATION such an operation with two or more persons. When you sling the unit for portage, do not fail to take into consideration the deviation of the gravity center from its center. CAUTION Improper slinging may cause the unit to lose balance and fall.
  • Page 122 '17 • KX-SM-272 Gas side Horizontal Floor surface Floor surface Floor surface Horizontal Liquid side Horizontal Floor surface Floor surface Floor surface Unit piping specifications The piping material should be phosphorus deoxidized copper seamless steel pipes. (C1220T, JIS H 3300) Attention Gas side Liquid side...
  • Page 123 '17 • KX-SM-272 Fix both liquid and gas service valves at the valve main bodies as illustrated on the right, and then fasten them, applying appropriate fastening torque. Do not hold the valve cap area with a spanner. Service valve size Tightening torque Tightening angle Recommended length...
  • Page 124 '17 • KX-SM-272 Vacuuming Please pull air from the check joints of the service valves on both liquid and gas sides. ＜Work flow＞ Airtighteness test completed Vacuuming begins When the system has remaining Please run the vacuum pump for at least one hour CAUTION moisture inside or a leaky point, after the vacuum gauge shows -101kPa or lower.
  • Page 125 '17 • KX-SM-272 4-4. Heat insulation for prevention of dew condensation (1) Dress refrigerant pipes (both gas and liquid pipes) for heat insulation and prevention of dew condensation. Improper heat insulation/anti-dew dressing can result in a water leak or dripping causing damage to household effects, etc. (2) Use a heat insulating material that can withstand 120℃...
  • Page 126 A typical resistance value is [46000 / (No. of connected FD○A△△KXE4 and KXE5 series units x 5) + (No. of connected FD○△△KXE6 and KXZ series units x 9)]. If the resistance value is 100 ohms or less, tentatively detach signal cables and thus, divide the network into more than one block (to reduce the number of indoor units connected in a network) to check for cabling errors in each such block.
  • Page 127 '17 • KX-SM-272 Indoor and outdoor signal wires Connect the signal line between indoor unit and outdoor unit to A1 and B1. ● Connect the signal line between outdoor units to A2 and B2. ● Please use a shielded cable for a signal line and connect a shielding earth at all the indoor units and outdoor units. ●...
  • Page 128 '17 • KX-SM-272 ● Address setting methods The following address setting methods can be used. The procedure for automatic address setting is different from the conventional one. Please use the automatic address setting function after reading this manual carefully. Communication protocol new SL previous SL Automatic...
  • Page 129 '17 • KX-SM-272 Unless stated otherwise, the following procedures apply, when new SL is chosen for the communication protocol. When previous SL is chosen, use figures shown in [ ] in carrying out these procedures. Manual address setting Generally applicable to new SL/previous SL, use figures in [ ] with previous SL. ①...
  • Page 130 '17 • KX-SM-272 STEP1 STEP2 STEP3 STEP4 ②OFF ④ON ー 　　　　　　　ー Indoor unit power source ①OFF ④ON ー 　　　　　　　ー Outdoor unit power source ②indoor000/outdoor 49 Indoor unit ー ー ー ( factory setting ) (indoor/outdoor No.switch) 　　　　　　　 ①01,02(Ex） ー ー 　　　　　　　ー...
  • Page 131 '17 • KX-SM-272 Operating procedure (1) When single indoor unit is connected to the remote control. Item Operation Display ① Press the AIR CON No. switch for 3 seconds or longer. Address change mode [CHANGE ADD.▼] ② Each time when you press the switch, the display indication will be switched. [CHANGE ADD.▼] ⇔[MASTER I/U▲] ③...
  • Page 132 '17 • KX-SM-272 7 segment display indication in automatic address setting ● Items that are to be set by the customer Code Contents of a display Communication protocol　1: New SL mode (The communication protocol is displayed ; display only) 　　　　　 0: previos SL mode 0: Automatic address standby Automatic address start...
  • Page 133 '17 • KX-SM-272 The external input function of CnS1 can be changed by changing the setting in P07 on the 7-segment display panel. When a signal is input to CnS1, the following functions are enabled. CnS1 closed CnS1 opened "0" : External operation input Operation permitted Operation prohibition "1"...
  • Page 134 '17 • KX-SM-272 (2) Procedure of check operation (a) Start of check operation ・Confirm that all of SW3-7 (Forced cooling/heating mode), SW-5-1 (Test run), SW5-2 (Test run cooling setting) and SW5-3 (Pump-down operation) are turned OFF. ・Change then SW3-5 (Check operation) OFF→ON to start the check operation. ・It takes normally about 15 - 30 minutes from the start to the end of check operation.
  • Page 135 '17 • KX-SM-272 6. OUTDOOR UNIT DISASSEMBLY PROCEDURE DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 136 '17 • KX-SM-272 PROCEDURE & PICTURES 9. To remove the compressor (CM) (1) Remove the service panel.(See No.1) (2) Remove the insulation which covers compressor. (Strings (a) (c) should be loosen.) (3) Remove the terminal cover fixing bolt and remove it, and disconnect the power wiring. (4) Remove welded part of compressor by welding.
  • Page 137 '17 • KX-SM-272 7. INDOOR UNIT DISASSEMBLY PROCEDURE DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 138 '17 • KX-SM-272 PROCEDURE & PICTURES Pipe lid To remove the heat exchanger assembly (1) Remove the drain pan.(See No.4) (2) Remove 2 pipe lid fixing screws and remove it.( mark) (3) Remove 3 heat exchanger assembly fixing screws and remove it.( mark) Coil of EEV 8.
  • Page 139 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 140 '17 • KX-SM-272 PROCEDURE & PICTURES Pipe lid To remove the heat exchanger assembly (1) Remove the drain pan.(See No.4) (2) Remove 2 plate fixing screws and remove it.( mark) (3) Remove 3 heat exchanger assembly fixing screws and remove it.( mark) Coil of EEV 8.
  • Page 141 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 142 '17 • KX-SM-272 PROCEDURE & PICTURES 6. To remove the drain pump(DM) and flot switch(FS) (1) Remove the drain pan.(See No.5) (2) Pull a hose to the arrow direction and remove it. (3) Remove 3 drain pump fixing screws and remove it.( mark) (4) Remove the flot switch fixing screw and remove it.( mark)
  • Page 143 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 144 '17 • KX-SM-272 PROCEDURE & PICTURES 8. To remove drain pump (DM) (1) Remove the lid of control box.(See No.1) (2) Remove the drain pan.(See No.4) (3) Disconnect the drain pump connector(CNRx) in the middle of wiring. (4) Pull a hose to the arrow direction and remove it. (5) Remove 2 drain pump assembly fixing screws and remove it.
  • Page 145 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 146 '17 • KX-SM-272 PROCEDURE & PICTURES 7. To remove drain pump (DM) (1) Remove the lid of control box.(See No.1) (2) Disconnect the drain pump connector(CNR) on PCB in control box. (3) Remove 4 drain pump assembly fixing screws and remove it.( mark) (4) Pull a hose to the arrow direction and remove it.
  • Page 147 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 148 '17 • KX-SM-272 PROCEDURE & PICTURES 7. To remove the drain pump(DM) and flot switch(FS) (1) Remove the lid of control box.(See No.1) (2) Remove 5 drain pump assembly fixing screws and remove it. mark) (3) Disconnect the drain pump connector(CNR) on PCB in control box. (4) Pull a hose to the arrow direction and remove it.
  • Page 149 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 150 '17 • KX-SM-272 PROCEDURE & PICTURES 6. To remove the control box (1) Remove the lid of control box.(See No.1) (2) Pull off all the inserted connectors. (3) Remove 2 cotrol box fixing screws and remove it. Pipe lid 7. To remove the heat exchanger assembly (1) Remove the bottom panel(B).(See No.3) (2) Remove the drain pan.(See No.5) (3) Remove the control box.(See No.6)
  • Page 151 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 152 '17 • KX-SM-272 PROCEDURE & PICTURES Pipe lid 7. To remove the heat exchanger assembly (1) Remove the drain pan.(See No.3) (2) Remove 3 pipe lid fixing screws and remove it.( mark) (3) Remove 4 heat exchanger assy fixing screws and remove it.( mark) 8.
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  • Page 157 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 158 '17 • KX-SM-272 PROCEDURE & PICTURES Bottom panel 6. To remove side panel and bottom panel (1) Remove air inlet grille.(See No.1) (2) Remove the right and left side panel fixing screws and remove it.( mark) (3) Remove 5 bottom panel fixing screws.( mark) Remove 6 bottom panel fixing screws and remove it.
  • Page 159 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 160 '17 • KX-SM-272 PROCEDURE & PICTURES 7. To remove the heat exchanger assembly (1) Remove the drain pan.(See No.4) (2) Remove 4 heat exchanger assy fixing screws and remove it.( mark) Cover 8. To remove the impeller and motor (FM) (1) Remove control box.(See No.1) (2) Disconnect the motor connector(CNM) on PCB in control box.
  • Page 161 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 162 '17 • KX-SM-272 PROCEDURE & PICTURES Top view Front view 6. To remove the heat exchanger assembly (1) Remove 9 top panel fixing screws and remove it .(Pic. (2) Remove 2 support fixing screws and remove it .(Pic. ) (3) Remove the lid of EEV box fixing screw and remove it.( mark, Pic.
  • Page 163 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 164 '17 • KX-SM-272 DISASSEMBLY PROCEDURE Precautions for safety Read these "Precautions for safety" carefully before starting disassembly work and do it in the proper way. When disassembling, be sure to turn off the power. When disassembling the electrical components, check the electrical wiring diagram. The electrical components are under high voltage by the operation of the booster capacitor.
  • Page 165 '17 • KX-SM-272 MEMO – –...
  • Page 166 MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD. 16-5 Konan 2-chome, Minato-ku, Tokyo, 108-8215, Japan http://www.mhi-mth.co.jp/en/ Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. Copyright MITSUBISHI HEAVY INDUSTRIES THERMAL SYSTEMS, LTD.

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