Mitsubishi Heavy Industries KXZ Series Service Manual

Vrf inverter multi-system air-conditioners

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SERVICE MANUAL

VRF INVERTER MULTI-SYSTEM AIR-CONDITIONERS

(OUTDOOR UNIT)

KXZ series

FDC121KXZEN1, 140KXZEN1, 155KXZEN1 (1 Phase)

FDC121KXZES1, 140KXZES1, 155KXZES1 (3 Phase)

Note:

•

(1) Regarding the Indoor unit series, refer to the No. '17 • KX-T-266 and '18 • KX-T-281.

(Heat pump type)

Manual No. '19 • KX-SM-318

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Summary of Contents for Mitsubishi Heavy Industries KXZ Series

Page 1 Manual No. '19 • KX-SM-318 SERVICE MANUAL VRF INVERTER MULTI-SYSTEM AIR-CONDITIONERS (OUTDOOR UNIT) KXZ series (Heat pump type) FDC121KXZEN1, 140KXZEN1, 155KXZEN1 (1 Phase) FDC121KXZES1, 140KXZES1, 155KXZES1 (3 Phase) Note: • (1) Regarding the Indoor unit series, refer to the No. ’17 • KX-T-266 and ’18 • KX-T-281.
Page 2 ‘19 • KX-SM-318 CONTENTS 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ..... 2 1.1 Remote control (Option parts) ..............2 1.2 Operation control function by the wired remote control ......5 1.3 Operation control function by the indoor control ........10 1.4 Operation control function by the outdoor control ........
Page 3 '16 • PAC-T-251 '19 • KX-SM-318 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 (1) Wired remote control Model RC-EX3A (a) Model RC-EX3A ⑤...
Page 4 '16 • PAC-T-251 ‘19 • KX-SM-318 (b) 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 '16 • PAC-T-251 '19 • KX-SM-318 (2) Wireless remote control Wireless remote control Model RCN-E2 Indication section ① OPERATION MODE display Indicates selected operation mode. SET TEMP display Indicates set temperature. SLEEP TIMER time display Indicates the amount of time remaining on the sleep timer. ②...
Page 6 ‘19 • KX-SM-318 1.2 Operation control function by the wired remote control 1.10.2 Operation control function by the wired remote control (1) Model RC-EX3A (a) Switching sequence of the operation mode switches of remote control (i) Tap the change operation mode button on the TOP screen. (ii) When the change operation mode screen is displayed, tap the button of desired mode.
Page 7 '19 • KX-SM-318 ●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. At power failure –...
Page 8 ‘19 • KX-SM-318 (2) Model RC-E5 (a) Switching sequence of the operation mode switches of remote control COOL HEAT AUTO (b) 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 9 '19 • KX-SM-318 (3) Operation and setting from wired 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 operations are possible. C : Loading a utility software via Internet Setting ＆...
Page 10 ‘19 • KX-SM-318 Setting ＆ display item Description RC-EX3A 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 11 '19 • KX-SM-318 1.3 Operation control function by the indoor control (1) 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:...
Page 12 ‘19 • KX-SM-318 (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 '19 • KX-SM-318 b) Thermostat ON i) When the heat exchanger temperature sensor (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 temperature sensor (Thi-R1 or R2, whichever higher) detects 25°C or higher, the fan operates with the fan control at heating thermostat OFF.
Page 14 ‘19 • KX-SM-318 (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 '19 • KX-SM-318 (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. ① Low fan speed (Factory default), ② Set fan speed, ③ Intermittence, ④ Fan OFF (ii) When the “Low fan speed (Factory default)”...
Page 16 ‘19 • KX-SM-318 (8) 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”.
Page 17 '19 • KX-SM-318 (11) 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 further by 20min Note (1) Indoor fan speed can be increased by up to 2 taps. • Compressor frequency drop start temperature Symbol ‘19 • KX-SM-318 Item Temperature - Low (Factory default) Temperature - High (b) Selection of indoor fan speed Note (1) Frost prevention temperature setting can be selected with the indoor unit function setting of the wired remote control.
Page 19 '19 • KX-SM-318 '16 • PAC-T-251 '16 • PAC-T-251 (17) Abnormal temperature sensor (return air/indoor heat exchanger) broken wire/short-circuit detection (17) Abnormal temperature sensor (return air/indoor heat exchanger) broken wire/short-circuit detection (a) Broken wire detection (a) Broken wire detection If the return air temperature sensor detects broken wire for 5 seconds continuously, the compressor stops (E7). If the heat If the return air temperature sensor detects broken wire for 5 seconds continuously, the compressor stops (E7).
Page 20 ‘19 • KX-SM-318 (b) Input for external control The external input for the indoor unit can be selected from the following input by the wired remote control. The input connectors (CnT-6 and CnTA) are equipped on the indoor unit control PCB. “LEVEL INPUT(Factory default)”...
Page 21 available*(1) *(1) In case that “Operation permission/prohibition mode” setting is “Valid” and “External input” setting is “Level input (Factory default)”; '19 • KX-SM-318 ① When card key switch is ON (CnT-6 or CnTA ON: Operation permission), start/stop operation of the unit from the wired remote control becomes available.
Page 22 Actual operation Stop Stop Stop Stop ‘19 • KX-SM-318 Remote control Remote Remote Remote control OFF control ON control ON Note (1) If it is prohibited by CnT, all “Operation” and “Stop” commands are not accepted. (f) In case of CnT ② operation/stop pulse + CnTA ③ operation permission/prohibition level CnTA Operation permission/ prohibition level...
Page 23 '19 • KX-SM-318 (c) If the cooling/heating selection signal is given by the external input, the operation mode is transmitted to the remote control. ■ Selection of cooling/heating external input function External input External input Operation selection method External input (CnT or CnTA) Cooling zone Heating zone...
Page 24 ‘19 • KX-SM-318 (25) High power operation (RC-EX3A 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. (26) Energy-saving operation (RC-EX3A only) It operates with the setting temperature fixed at 28°C for cooling, 22°C for heating or 25°C for auto. When fan control in cooling/ heating thermo-OFF setting is “Set fan speed”, fan speed during thermo-OFF is changed to “Low”.
Page 25 In order to reach the room temperature to the set temperature as quickly as possible, the air flow rate is increased when the set temperature of thermostat differs largely from the return air temperature. According to temperature difference between set temperature and return air temperature, indoor fan tap are controlled automalically.
Page 26 ‘19 • KX-SM-318 1.4 Operation control function by the outdoor control (A) Normal control (1) 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...
Page 27 '19 • KX-SM-318 (c) Fan control during heating During heating, fan speed is controlled in accordance with the low pressure (sensed by PSL). (i) 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 28 ‘19 • KX-SM-318 (5) 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. (i) If the discharge pipe temperature sensor detects 115°C or higher for 2 seconds continuously, it makes compressor stopped.
Page 29 '19 • KX-SM-318 • 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 30 ‘19 • KX-SM-318 (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 31 '19 • KX-SM-318 (1) External input and demand input (a) Operation permission and prohibition modes (Note) With 7-segment display [P07]-[0] 1) 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 32 ‘19 • KX-SM-318 2) 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)
Page 33 '19 • KX-SM-318 (2) 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 (i) When the strat command of silent mode input from indoor unit or from external input terminal of outdoor unit has become effective.
Page 34 ‘19 • KX-SM-318 (3) 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 35 '19 • KX-SM-318 (5) 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 (i) 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 36 ‘19 • KX-SM-318 (8) 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 37 '19 • KX-SM-318 (9) 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 38 ‘19 • KX-SM-318 (10) Outdoor operation mode On the standard models of 2-pipe system, the outdoor operation mode of Stop/Cooling/Heating is selected based on the information of indoor units, and then respective controls are performed. <Contents of control> (a) Determination of outdoor operation mode Operation mode of outdoor unit is determined based on respective signals of Operation/Stop and Cooling/Heating.
Page 39 '19 • KX-SM-318 When it is changed from same mode to unmatch. ③ Indoor unit 0 Stop Cooling Heating “Invalid operation” lamp ﬂickers. Indoor unit 1 Stop Cooling Cooling Operation mode is prepared for change in the fan mode. ④ Indoor unit 0 Stop Indoor unit 1...
Page 40 ‘19 • KX-SM-318 (d) Forced cooling /heating operation (Master unit) (Note) Following explanation is based on using CnG1 terminal and setting function [P09]-[2] with 7-segment display. However other terminals can be used with following function setting of 7-segment display. CnS1: [P07]-[2] CnS2: [P08]-[2] CnG2: [P10]-[2] 1) When SW3-7 on the outdoor control PCB is turned ON after setting function [P09]-[2] with 7-segment display, if...
Page 41 '19 • KX-SM-318 (11) VTCC : Variable Temperature and capacity control (VRF inverter Multi-system energy save control) On the multi-system, target pressures are set uniformly so that indoor units operate with a constant capacity and repeat the ON/OFF control with which thermostats are turned OFF when temperatures become near the setting temperature. Owing to the tuning of target high/low pressure near the setting temperature, it becomes possible to perform the high efﬁciency operation near the setting temperature.
Page 42 ‘19 • KX-SM-318 (C) Data output (1) 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 43 '19 • KX-SM-318 (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 ①...
Page 44 ‘19 • KX-SM-318 (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 45 '19 • KX-SM-318 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 46 ‘19 • KX-SM-318 Code Minimum Contents of data display Data display range Remarks unit C56 Target Fk 0 - 999 C57 Inverter 1 operation frequency command 0 - 130 C58 Demand ratio 0 - 100 1％ C59 FMo1 Fan Speed command 0 - 999 10min C60 (Spare) FMo2 Fan Speed command...
Page 47 '19 • KX-SM-318 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 ③ Counter · Anomalous low pressure (During 0 - 5 operation)
Page 48 ‘19 • KX-SM-318 Code Minimum Contents of data display Data display range Remarks unit <User setting> P00 (Spare) – – – – – – 0: First unit's operation mode 0 : (Factory default) 1: Last unit's operation mode P01 Operation preference switching –...
Page 49 '19 • KX-SM-318 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 50 ‘19 • KX-SM-318 (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 51 '19 • KX-SM-318 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 52 ‘19 • KX-SM-318 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 53 '19 • KX-SM-318 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 54 ‘19 • KX-SM-318 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 55 '19 • KX-SM-318 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 56 ‘19 • KX-SM-318 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 57 '19 • KX-SM-318 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 58 ‘19 • KX-SM-318 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 59 '19 • KX-SM-318 (2) Outdoor unit 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 60 ‘19 • KX-SM-318 2. SYSTEM TROUBLESHOOTING PROCEDURE SYSTEM TROUBLESHOOTING PROCEDURE 2.1 Basics of troubleshooting 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 61 '19 • KX-SM-318 2.2 Explanation of troubleshooting 2.2 Explanation of troubleshooting (a) Checking 15V 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 62 ‘19 • KX-SM-318 2.3 Contents of troubleshooting 2.3 Contents of troubleshooting (a) List of inspection displays 1) 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 –...
Page 63 '19 • KX-SM-318 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 It is normal.
Page 64 ‘19 • KX-SM-318 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 It is normal.
Page 65 '19 • KX-SM-318 Green Error code Content Stays Off Stays Off Indoor Remote control: None Earth leakage breaker activated 7-segment display: Stays Off Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are the insulation resistance Replace compressor. * and and coil resistance of compressor OK? 2.
Page 66 ‘19 • KX-SM-318 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 67 '19 • KX-SM-318 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 1/3 Rearrange the piping to Are the pipes avoid contact with the contacting with the casing.
Page 68 ‘19 • KX-SM-318 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 2/3 If insufficient cooling [Adjustment heating problem happens during commissioning] due to anomalous operating Does noise/vibration occur when the conditions at cooling...
Page 69 '19 • KX-SM-318 Green Error code Content Keeps flashing Stays Off Indoor Remote control: None Louver motor anomaly 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure ˜Check at the indoor unit side. Operate after waiting for more than 1 minute.
Page 70 ‘19 • KX-SM-318 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 Outdoor 5. Troubleshooting 1. Applicable model FDT, FDTC, FDK series only Diagnosis Countermeasure AC 220-240V...
Page 71 '19 • KX-SM-318 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 Outdoor 5. Troubleshooting 1. Applicable model Except FDT, FDTC, FDK series Diagnosis Countermeasure AC 220-240V...
Page 72 ‘19 • KX-SM-318 Green Error code Content Power source system error Stays OFF Indoor Remote control: None (Power source to remote control) 7-segment display: Outdoor 5. Troubleshooting 1. Applicable model FDT, FDTC, FDK series only Diagnosis Countermeasure Is the connection of the Correct.
Page 73 '19 • KX-SM-318 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 Outdoor 5. Troubleshooting 1. Applicable model Except FDT, FDTC, FDK series Diagnosis Countermeasure Isn't there any Correct it.
Page 74 ‘19 • KX-SM-318 Green Error code Content Indoor Remote control: Keeps flashing Stays Off WAIT WAIT 7-segment display: Outdoor Keeps flashing Keeps flashing 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 is kept on WAIT...
Page 75 '19 • KX-SM-318 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 76 ‘19 • KX-SM-318 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 Does...
Page 77 '19 • KX-SM-318 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 is kept on WAIT...
Page 78 ‘19 • KX-SM-318 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 unit control PCB stays OFF) In case that LED on outdoor unit control PCB stays Once turn OFF the breaker...
Page 79 '19 • KX-SM-318 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) Isn't there any short circuit...
Page 80 ‘19 • KX-SM-318 Green Error code Content Stays OFF Stays Off Indoor 〔 No display 〕 Remote control: [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...
Page 81 '19 • KX-SM-318 Green Error code Content Remote control Stays Off Indoor Remote control: communication error 7-segment display: - 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 82 ‘19 • KX-SM-318 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 83 '19 • KX-SM-318 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 between indoor and outdoor units is not established at all.
Page 84 ‘19 • KX-SM-318 Green Error code Content Keeps flashing *See below Indoor Remote control: Communication error during operation 7-segment display: Keeps flashing 2 time flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure * In case that indoor unit red LED flashes 2 times Note (1) Check the connection (disconnection, looseness) of signal wires at outdoor unit terminal block Is the...
Page 85 '19 • KX-SM-318 Green Error code Content Indoor unit heat exchanger Keeps flashing 1 time flash Indoor Remote control: temperature sensor anomaly (Thi-R) 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Insert the connector the connector of sensor connected securely.
Page 86 ‘19 • KX-SM-318 Green Indoor return air Error code Content Keeps flashing 1 time flash Indoor Remote control: temperature sensor anomaly (Thi-A) 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure the connector of Insert the connector sensor connected securely.
Page 87 '19 • KX-SM-318 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, FDR, FDU, FDUM, and FDUT series Check the error data in the remote control.
Page 88 ‘19 • KX-SM-318 Green Error code Content Excessive number of indoor units (moe than 17 units) Keeps flashing Stays Off Indoor Remote control: by controlling one remoto control 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...
Page 89 '19 • KX-SM-318 Green Error code Content Address setting error Keeps flashing Keeps flashing 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 automatic setting and Review address setting.
Page 90 ‘19 • KX-SM-318 Green Error code Content Indoor fan motor anomaly Keeps flashing 1 time flash Indoor Remote control: (FDT, FDTC series) 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model FDT, FDTC series only Diagnosis Countermeasure Does any foreign matter intervene Remove foreign matter.
Page 91 '19 • KX-SM-318 Green Error code Content Indoor fan motor anomaly Keeps flashing 1 time flash Indoor Remote control: (FDK series) 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model FDK series only Diagnosis Countermeasure Does any foreign matter intervene Remove foreign matter.
Page 92 ‘19 • KX-SM-318 Green Error code Content Indoor unit operation check, Keeps flashing 1 time flash Indoor Remote control: drain pump motor check mode anomaly 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure E19 occurs when the power ON...
Page 93 '19 • KX-SM-318 Green Error code Content Remote control Keeps flashing Stays Off Indoor Remote control: temperature sensor anomaly (Thc) 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure the connector of Insert the connector sensor connected securely.
Page 94 ‘19 • KX-SM-318 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 Is the wiring connection between Correct the wiring.
Page 95 '19 • KX-SM-318 Green Error code Content Stays Off Indoor Remote control: Duplicated outdoor unit address No. 7-segment display: Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition. Check the conditions whether it occurs immediately after the power Save data for 30 minutes before...
Page 96 ‘19 • KX-SM-318 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 97 '19 • KX-SM-318 Green Error code Content Discharge pipe temperature Stays Off Indoor Remote control: error (Tho-D1) 7-segment display: E36-1 Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition. Save data for 30 minutes before stopping in Mente PC. Check the ROM version.
Page 98 ‘19 • KX-SM-318 Green Error code Content Stays Off Indoor Remote control: 7-segment display: E36-3 Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition. Save data for 30 minutes before stopping in Mente PC. Check ROM version.
Page 99 '19 • KX-SM-318 Outdoor unit heat exchanger Green Error code Content temperature sensor (Tho-R) and subcooling coil Keeps flashing Stays Off Indoor Remote control: temperature sensor (Tho-SC,-H) anomaly 7-segment display: E37-1, 5, 6*1 Keeps flashing Outdoor *1 E37-1: one time flash (Tho-R1), E37-5: 5 time flash (Tho-SC), E37-6: 6 time flash (Tho-H) 5.
Page 100 ‘19 • KX-SM-318 Green Error code Content Outdoor air temperature Keeps flashing Stays Off Indoor Remote control: sensor 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 101 '19 • KX-SM-318 Green Error code Content Discharge pipe temperature Keeps flashing Stays Off Indoor Remote control: sensor 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 102 ‘19 • KX-SM-318 Green Error code Content High pressure anomaly Keeps flashing Stays Off Indoor Remote control: (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 103 '19 • KX-SM-318 Green Error code Content Keeps flashing Stays Off Indoor Remote control: E41(E51) Power transistor overheat 7-segment display: E41(E51)-1 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 ‘19 • KX-SM-318 Green Error code Content Stays Off Indoor Remote control: Current cut (1) 7-segment display: Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Is the Check power source. power source voltage OK? 2. Error detection method Are the Open the valves.
Page 105 '19 • KX-SM-318 Green Error code Content Stays Off Indoor Remote control: Current cut (2) 7-segment display: Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Continue from previous page Is the checked result of Replace inverter PCB. power transistor module OK? 2.
Page 106 ‘19 • KX-SM-318 Green Error code Content Excessive number of indoor units connected, Stays Off Indoor Remote control: excessive total capacity of connection 7-segment display: E43-1, 2 *1 Stays Off*1 Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
Page 107 '19 • KX-SM-318 Green Error code Content Communication error between Stays Off Indoor Remote control: inverter PCB and outdoor unit control PCB 7-segment display: 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 108 ‘19 • KX-SM-318 Green Error code Content Mixed address setting methods Stays Off Indoor Remote control: coexistent in same network 7-segment display: Stays Off Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
Page 109 '19 • KX-SM-318 Green Error code Content Stays Off Indoor Remote control: Outdoor DC fan motor anomaly 7-segment display: Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating conditions. Save data for 30 minutes before stoopping in Mente PC. Does any foreign material Remove foreign material.
Page 110 ‘19 • KX-SM-318 Green Error code Content Stays Off Indoor Remote control: Low pressure error 7-segment display: Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition. Save data for 30 minutes before stopping in Mente PC. Check error status.
Page 111 '19 • KX-SM-318 Green Error code Content Suction pipe temperature sensor anomaly Stays Off Indoor Remote control: (Tho-S) 7-segment display: Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition. Save data for 30 minutes before stopping in Mente PC. Check the conditions whether it occurs immediately after the...
Page 112 ‘19 • KX-SM-318 Green Error code Content High pressure sensor anomaly (PSH) Keeps flashing Stays Off Indoor Remote control: 7-segment display: E54-1, 2 *1 Low pressure sensor anomaly (PSL) Keeps flashing Outdoor *1 E54-1: 1 time flash (PSL), E54-2 : 2 time flash (PSH) 5.
Page 113 '19 • KX-SM-318 Green Error code Content Power transitor temperature Keeps flashing Stays Off Indoor Remote controller: sensor anomaly (Tho-P1) 7-segment display: E56-1 Keeps flashing 1 time ﬂash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
Page 114 ‘19 • KX-SM-318 Green Error code Content Anomalous compressor Keeps flashing Stays Off Indoor Remote control: by loss of synchronism 7-segment display: E58-1 Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
Page 115 '19 • KX-SM-318 Green Error code Content Stays Off Indoor Remote control: Compressor startup failure 7-segment display: 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. operating conditions.
Page 116 ‘19 • KX-SM-318 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 conditions. Save data for 30 minutes before stopping in Mente PC Check the conditions whether it occurs...
Page 117 '19 • KX-SM-318 2.4 Outdoor unit control PCB replacement procedure 2.4 Outdoor unit control PCB replacement procedure (a) 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 118 ‘19 • KX-SM-318 (b) Inverter PCB 1) FDC121, 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 Refer to table1 for the setting of switch (JSW10,11) of new PCB.
Page 119 '19 • KX-SM-318 2) FDC121, 140, 155KXZES1 model a) 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)) b) Take off the connection of inverter PCB terminal block connector and remove the screw of power transistor then c) Refer to table1 for the setting of switch (JSW10,11) of new PCB.
Page 120 ‘19 • KX-SM-318 ■Function of DIP switch for contol (SW3, 4, 5) • SW3 (Function setting) • SW4 (Model selection) Model Switch Function FDC121KXZE1 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 121 '19 • KX-SM-318 ■ 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 122 ‘19 • KX-SM-318 3. ELECTRICAL WIRING Models FDC121KXZEN1, 140KXZEN1, 155KXZEN1 – –...
Page 123 '19 • KX-SM-318 Models FDC121KXZES1, 140KXZES1, 155KXZES1 – –...
Page 124 ‘19 • KX-SM-318 4. PIPING SYSTEM All models – –...
Page 125 '19 • KX-SM-318 5. APPLICATION DATA ◎This manual describes outdoor unit installation work. Outdoor unit capacity PSB012D926W ◎For indoor unit installation and electrical cabling, please refer to the Designed for R410A refrigerant indoor unit installation manual and the installation guide. FDC121－155 ◎When install the unit, be sure to check whether the selection of installation place, power source speciﬁcations, usage limitation (piping length, height...
Page 126 Indoor unit RC－EX1A （ 2 cores） RC－E5 （ 2 cores） 1－10 ※ 1－10 ※ Number of connectable units 1－8 FD○△△KXE6 KXZ Series indoor unit RC－E4 （ 2 cores） Total capacity of indoor units 97－181 112－210 124－232 RC－E3 （ 2 cores）...
Page 127 '19 • KX-SM-318 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 128 ‘19 • KX-SM-318 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 129 '19 • KX-SM-318 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 130 ‘19 • KX-SM-318 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 131 '19 • KX-SM-318 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 132 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 133 '19 • KX-SM-318 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 134 ‘19 • KX-SM-318 ● 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. new SL previous SL Communication protocol Automatic...
Page 135 '19 • KX-SM-318 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 136 ‘19 • KX-SM-318 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) 　　　　　　　ー ①01,02(Ex）ー　　　　　　　ー...
Page 137 '19 • KX-SM-318 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 138 ‘19 • KX-SM-318 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 plotocol is displayed ; display only) 　　　　　 0: previos SL mode 0: Automatic address standby Automatic address start 1: Automatic address start...
Page 139 '19 • KX-SM-318 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 140 ‘19 • KX-SM-318 (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 141 '19 • KX-SM-318 6. OUTDOOR UNIT DISASSEMBLY PROCEDURE 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 142 ‘19 • KX-SM-318 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 143 '19 • KX-SM-318 . 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 144 ‘19 • KX-SM-318 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 145 '19 • KX-SM-318 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 ‘19 • KX-SM-318 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 147 '19 • KX-SM-318 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 ‘19 • KX-SM-318 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 149 '19 • KX-SM-318 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 ‘19 • KX-SM-318 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 151 '19 • KX-SM-318 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 ‘19 • KX-SM-318 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 153 '19 • KX-SM-318 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 154 ‘19 • KX-SM-318 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 155 '19 • KX-SM-318 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 156 ‘19 • KX-SM-318 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 157 '19 • KX-SM-318 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 ‘19 • KX-SM-318 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.
Page 159 '19 • KX-SM-318 – –...
Page 160 ‘19 • KX-SM-318 [Removing the Control] Screw the control toward right – –...
Page 161 '19 • KX-SM-318 – –...
Page 162 ‘19 • KX-SM-318 – –...
Page 163 '19 • KX-SM-318 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 ‘19 • KX-SM-318 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 165 '19 • KX-SM-318 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 166 ‘19 • KX-SM-318 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 167 '19 • KX-SM-318 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 168 ‘19 • KX-SM-318 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 169 '19 • KX-SM-318 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 170 ‘19 • KX-SM-318 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 171 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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