Mitsubishi Heavy Industries FDC224KXZME1 Service Manual

Vrf inverter multi-system air-conditioners (outdoor unit)

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SERVICE MANUAL

VRF INVERTER MULTI-SYSTEM

AIR-CONDITIONERS

(OUTDOOR UNIT)

KXZ series (Heat pump type)

FDC224KXZME1, 280KXZME1, 335KXZME1A

Note :

•

(1) Regarding the indoor unit series, refer to the No.'17

Manual No.'20・KX-SM-354

KX-T-266 and '18

KX-T-281.

•

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Summary of Contents for Mitsubishi Heavy Industries FDC224KXZME1

Page 1 Manual No.'20・KX-SM-354 SERVICE MANUAL VRF INVERTER MULTI-SYSTEM AIR-CONDITIONERS (OUTDOOR UNIT) KXZ series (Heat pump type) FDC224KXZME1, 280KXZME1, 335KXZME1A Note : • (1) Regarding the indoor unit series, refer to the No.'17 KX-T-266 and '18 KX-T-281. • •...
Page 2 '20 • KX-SM-354 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 '20 • KX-SM-354 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 '20 • KX-SM-354 (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 '20 • KX-SM-354 (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 '20 • KX-SM-354 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 '20 • KX-SM-354 ●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 '20 • KX-SM-354 (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 '20 • KX-SM-354 (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 '20 • KX-SM-354 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 '20 • KX-SM-354 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 '20 • KX-SM-354 (vii) Combination of patterns which can be set for the timer operations Weekly timer Sleep timer Set OFF timer by hour Set ON timer by hour Set OFF timer by clock Set ON timer by clock Sleep timer Í...
Page 13 '20 • KX-SM-354 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 '20 • KX-SM-354 (b) RC-E5 (i) Louver control 1) 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. 2) To fix the swing louver at a position, press one time the “LOUVER”...
Page 15 '20 • KX-SM-354 (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 '20 • KX-SM-354 (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 '20 • KX-SM-354 (11) Drain pump abnormalities detection (Except FDK) (a) 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 '20 • KX-SM-354 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 '20 • KX-SM-354 '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 '20 • KX-SM-354 (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)”; '20 • KX-SM-354 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 '20 • KX-SM-354 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 ③...
Page 23 '20 • KX-SM-354 (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 '20 • KX-SM-354 (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 Back Select the item. '20 • KX-SM-354 RCN-E2 1. Set indoor functions ① Press the ON/OFF button to stop the unit. ② Press the desired one of the buttons shown item 2. while holding down the ① ② FUNCTION SETTING switch. ②...
Page 27 '20 • KX-SM-354 1.4 Operation control function by the outdoor control (A) Normal control (1) Operation of major functional components under each operation mode Heating Cooling/Dehumidifying Operation mode Thermostat Thermostat Thermostat Thermostat Defrost Functional item 〇 × × 〇 × 〇...
Page 28 '20 • KX-SM-354 (2) Compressor pre-start control (a) Remote control full stop → Operation (i) Starting conditions • When it has changed to the compressor operation frequency command > 0 Hz from the state of compressor stopping. (ii) Control contents •...
Page 29 '20 • KX-SM-354 (b) Cooling → Heating (i) Starting conditions • When the outdoor unit operation mode is changed from the cooling operation to heating operation (ii) Control contents 1) When the compressor is operating, it makes the compressor stopped. 2) Each functional component operates according to the sequence shown below.
Page 30 '20 • KX-SM-354 (c)　 Heating → Cooling (i) 　 Starting conditions • When the outdoor unit operation mode is changed from the heating operation to cooling operation (ii) 　 Control contents When the compressor is operating, it makes the compressor stopped. Each functional component operates according to the sequence shown below .
Page 31 (ii) The target compressor speed is shown in following table. 4-way valve switching safeguard/Target compressor speed Item Model Frequency (Fk) Speed (rps) FDC224KXZME1 FDC280KXZME1 FDC335KXZME1A (b) Compressor protection start After the 4-way valve switching safeguard, the compressor is controlled with the following compressor protection start. Compressor protection start, normal...
Page 32 '20 • KX-SM-354 < Ending conditions > When either one of following conditions is established a) When the frequency upper limit increase by this control continued for 15 minutes in total When the inverter has stopped within 15 minutes after the start and is started again, it starts with the normal protection start and increases the frequency upper limit at a rate of 5 rps/minute till the frequency increase continues for 15 minutes in total.
Page 33 800 (780) 800 (780) Note (1) Figures in the parentheses in the above table are applicable to FDC224KXZME1. (b) Fan control during cooling During cooling and dehumidifying, fan speed is controlled in accordance with the high pressure (sensed by PSH) and the outdoor air temperature (sensed by Tho-A).
Page 34 '20 • KX-SM-354 (c)　 Outdoor fan cooling control at low outdoor air temperature (i) 　 Starting conditions This control is performed when all of following conditions is established. When the ordinary outdoor fan control is performed Outdoor air temperature ≦ 10ºC (It is reset with the hysteresis of the outdoor air temperature > 15ºC.) Valid Invalid Outdoor air temperature (ºC)
Page 35 '20 • KX-SM-354 (5) Defrost control (a) Temperature condition of defrost operation (Standard speciﬁcation or cold region speciﬁcation can be selected by switching the (i) Starting conditions jumper wire J15.) Defrost operation will start, when outdoor unit whose compressor is operating under heating mode has satisfied all the following conditions.
Page 36 '20 • KX-SM-354 (6) Protective control (a) Discharge pipe temperature (Td) control Discharge pipe temperature sensor (Tho-D1) monitors the discharge pipe temperature (Td) to avoid the rise of discharge pipe temperature. (i) Compressor capacity control 1) Starting conditions When all of following conditions are satisfied When the compressor is ON state.
Page 37 '20 • KX-SM-354 (B) Option controls • Functions of outdoor PCB connector CnS1 , CnS2, CnG1, CnG2 and CnZ1 ① CnS1 connector : By changing the allocation of external input functions [P07- “ X ” ] on the 7-segment, following functions can be selected.
Page 38 '20 • KX-SM-354 (1) External input and demand input (a) Operation permission or prohibition modes Note (1) With 7-segment display [P07]-[0] (CnS2:[P08]-[0], CnG1:[P09]-[0] and CnG2[P10]-[0] can be used as well.) (i) Operation permission or operation prohibition mode is switched with the connector (CnS1) and the jumper wire (J13) on the outdoor PCB.
Page 39 '20 • KX-SM-354 (ii) Operation/ stop control by the demand input CnS2 of outdoor unit CnS2: Switching of demand control/ Input: CnS2 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 40 '20 • KX-SM-354 (c) 2-step demand control (i) Starting condition If all the following conditions are satisfied. 1) 7-segment display [P04] is set 0%, 40%, 60% or 80% (except OFF). 2) Demand control is in operation. 3) External input connector of outdoor unit for "2-step demand control" is valid. Ex.
Page 41 0 setting 1 setting 2 setting 3 dB(A) dB(A) dB(A) dB(A) dB(A) dB(A) FDC224KXZME1 FDC280KXZME1 FDC335KXZME1A Sound power level Sound power level Silent mode Silent mode Silent mode Silent mode Model for cooling for heating...
Page 42 '20 • KX-SM-354 (3) Outdoor fan snow protection control (a) This control is enabled/disabled by entering data into 7-segment display. (b) Setting method of outdoor fan control [Starting conditions] When following conditions are established for 10 minutes continuously. Snow protection control setting is valid ([P02]-1) and outdoor air temperature < 3°C or external input of outdoor fan snow protection control ON.
Page 43 '20 • KX-SM-354 (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 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 44 However, when the operation starting conditions have been established during the 3-minute delay control of compressor, the compressor starts after completing the 3-minute delay control. Item Target compressor speed at pump down operation Model FDC224KXZME1 50rps FDC280KXZME1 62rps FDC335KXZME1A (ii) As the starting conditions are established, both red LED and green LED on the outdoor PCB flash continuously.
Page 45 '20 • KX-SM-354 (9) 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 46 '20 • KX-SM-354 ③ When it is changed from same mode to unmatch. Indoor unit 0 Stop Cooling Heating “Invalid operation” lamp flickers. Indoor unit 1 Stop Cooling Cooling ④ Operation mode is prepared for change in the fan mode. Indoor unit 0 Stop Indoor unit 1...
Page 47 '20 • KX-SM-354 (iii) With the forced mode from indoor unit, if a different operation mode is commanded, following operations take place based on the forced cooling/heating operation set with the 7-segment [P38]. P38 = 0: The operation mode unmatch is displayed on the remote control, etc., and it is changed to the fan operation.
Page 48 '20 • KX-SM-354 ● Pump down by external input Activate by 7-segment:[P77]=“1” Emergency call => External operation input : Shorted Alarm unit Gas leakage Pump down <== operation (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.
Page 49 '20 • KX-SM-354 (b) Compressor upper limit speed restriction for each operation capacity (i) Starting condition (either of ① or ② ) ① When the external input assignment [P07] – [P10]: Multi-system energy save operation = Valid and 7-segment [P67] (Multi-system energy save control II) = 1 or 2 or 3 Factory default: 0 (OFF)/1 (Setting 1), 2 (Setting 2), 3 (Setting 3) ②...
Page 50 '20 • KX-SM-354 (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 51 '20 • KX-SM-354 (iv) Precedence of display Œ [EXX] > [Related to check operation ([CHJ] > [CHU])] > [PdE] > [PdS]> [oPX] > [CXX] If resetting from the display of Œ , it is switched to [C00]. Ž If SW8 or SW9 is pressed during the display of Œ , it changes to [C00]. However, unless no button input is done for 10 seconds after change to [C00], it changes to the display of Œ...
Page 52 '20 • KX-SM-354 (b) List of 7-segment displays Code Contents of display Data display range Minimum unit Remark Error display [EXX] Caution display [oPX] Special display [PdS][PdE] Code Contents of data display Data display range Minimum unit Remark <Sensor value, actuator information> CM1 operation frequency 0 - 140 (Spare)
Page 53 '20 • KX-SM-354 Code Minimum Contents of data display Data display range Remark unit Order of 100: CnG2 C32 External input – Order of 10: (Spare) (0: Close, 1: Open) Order of 1: (Spare) Order of 100: 52C-1 C33 Relay output –...
Page 54 '20 • KX-SM-354 Code Minimum Contents of data display Data display range Remark unit <Anomalous counter information> C70 Counter · Sensor wire disconnected 0 - 3 C71 Counter · High pressure protection 0 - 5 Counter · Anomalous low pressure Ž (During 0 - 5 operation) C73 Counter ·...
Page 55 '20 • KX-SM-354 Code Minimum Contents of data display Data display range Remark unit <User setting> P00 (Spare) – – – – – 0: First push preference (Factory default) 0 : (Factory default) 1: Last push preference P01 Operation preference switching –...
Page 56 '20 • KX-SM-354 Code Min. Data display contents Data display range Remark unit <Service engineer setting> – – – – – – – P16 (Spare) – – – – – – – P17 (Spare) – – – – – – – P18 (Spare) 0: Control for ensuring certain indoor outlet air temperature Preferencial switch to ensure...
Page 57 '20 • KX-SM-354 (c) Saving of operation data Mainly for investigating the 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 58 '20 • KX-SM-354 2 ) Outdoor unit Code Record data Number of Write contents Unit of write Content 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 59 '20 • KX-SM-354 Code Record data Unit of Number of Write contents Content Data write range write bytes FMo1 Fan speed command 0 - 65535 10min FMo2 Fan speed command 0 - 65535 10min EEVH1 opening degree 0 - 65535 1 pulse EEVSC opening degree 0 - 65535...
Page 60 '20 • KX-SM-354 Code Record data Unit of Number of Write contents Content Data write range write bytes DIP switch [SW6] – – Bit0 SW6-1 0 : OFF, 1 : ON Bit1 SW6-2 0 : OFF, 1 : ON Bit2 SW6-3 0 : OFF, 1 : ON Bit3...
Page 61 '20 • KX-SM-354 Code Record data Unit of Number of Write contents Content 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 62 '20 • KX-SM-354 Code Record data Unit of Number Write contents Content Data write range write of bytes Heating setting 2 (Target high 0.05 3.15 - 2.75 pressure) [ MPa ] Heating setting 3 (Judgment 30 - 38 1 [ °C ] temperature) <Indoor unit information>...
Page 63 '20 • KX-SM-354 (2) Outdoor PCB setting Code Input Remark Outdoor address No. (Order of 10) Outdoor address No. (Order of 1) Normal ★ /Reseet SW3-1 Inspection LED reset Normal ★ /Forced heating-cooling SW3-7 Forced heating/cooling Normal ★ /Test SW3-8 Test mode Normal ★...
Page 64 '20 • KX-SM-354 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 65 '20 • KX-SM-354 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 66 '20 • KX-SM-354 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 67 '20 • KX-SM-354 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 unit fan operation Check the temperature difference between return and suction air of indoor unit It is normal.
Page 68 '20 • KX-SM-354 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 69 '20 • KX-SM-354 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 resistance between terminals (1) of compressor OK? (1) 0.691 Ω...
Page 70 '20 • KX-SM-354 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 71 '20 • KX-SM-354 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 72 '20 • KX-SM-354 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 73 '20 • KX-SM-354 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 74 '20 • KX-SM-354 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 times flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure AC 220-240V/220V...
Page 75 '20 • KX-SM-354 Green Error code Content Power source system error Stays Off Keeps lighting Indoor Remote control: None (Power source to remote control) 7-segment display: Stays Off Keeps lighting Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Isn't there any Correct it.
Page 76 '20 • KX-SM-354 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 controller for more than 2 is kept on WAIT...
Page 77 '20 • KX-SM-354 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) there any short circuit between phases of noise...
Page 78 '20 • KX-SM-354 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 79 '20 • KX-SM-354 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 80 '20 • KX-SM-354 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 81 '20 • KX-SM-354 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 82 '20 • KX-SM-354 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 83 '20 • KX-SM-354 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 Is it possible to Malfunction by temporary reset normally by the power source reset? noise...
Page 84 '20 • KX-SM-354 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 85 '20 • KX-SM-354 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 86 '20 • KX-SM-354 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 87 '20 • KX-SM-354 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 the connector of Insert the connector sensor connected securely.
Page 88 '20 • KX-SM-354 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 89 '20 • KX-SM-354 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 FDQS series Check the error data in the remote control.
Page 90 '20 • KX-SM-354 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 91 '20 • KX-SM-354 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 92 '20 • KX-SM-354 Green Error code Content Indoor fan motor anomaly Keeps flashing 1 time flash Indoor Remote control: (FDT series) 7-segment display: Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model FDT series only Diagnosis Countermeasure Does any foreign matter intervene Remove foreign matter.
Page 93 '20 • KX-SM-354 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 94 '20 • KX-SM-354 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 95 '20 • KX-SM-354 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 96 '20 • KX-SM-354 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 97 '20 • KX-SM-354 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 98 '20 • KX-SM-354 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 99 '20 • KX-SM-354 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 100 '20 • KX-SM-354 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Liqiud flooding anomal 7-segment display: E36-3 Keeps flashing 3 times flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor units Diagnosis Countermeasure Check and save the data of Save data for 30 minutes before stopping in Mente PC operating condition.
Page 101 '20 • KX-SM-354 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, 2, 5, 6*1 Keeps flashing Outdoor *1 E37-1: one time flash (Tho-R1), E37-2: 2 time flash (Tho-R2), E37-5: 5 time flash (Tho-SC), E37-6: 6 time flash (Tho-H) 5.
Page 102 '20 • KX-SM-354 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 103 '20 • KX-SM-354 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 104 '20 • KX-SM-354 Green Error code Content High pressure anomaly Keeps flashing Stays Off Indoor Remote control: (63H1-1activated) 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 '20 • KX-SM-354 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 106 '20 • KX-SM-354 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Current cut (CM1) 7-segment display: E42-1 Keeps flashing 1 time ﬂash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating conditions.
Page 107 '20 • KX-SM-354 Excessive number of indoor units connected, Green Error code Content excessive total capacity of connection Keeps flashing Stays Off Indoor Remote control: Unit communication error 7-segment display: E43-1, 2, 3 *1 Keeps flashing Outdoor *1 E43-1:1 time flash (Excessive number of indoor units connected), E43-2 :2 time flash (Excessive capacity of indoor units connection), E43-3:3 time flash (Communication error between the outdoor and indoor units) 5.
Page 108 '20 • KX-SM-354 Green Error code Content Communication error between Keeps flashing Stays Off Indoor Remote control: inverter PCB and outdoor unit control PCB 7-segment display: E45-1 Keeps flashing 1 time ﬂash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of...
Page 109 '20 • KX-SM-354 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 conditions.
Page 110 '20 • KX-SM-354 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Outdoor unit DC fan motor anomaly 7-segment display: E48-1, 2 *1 Keeps flashing Outdoor *1 E48-1: 1 time flash (FMO1), E48-2 : 2 time flash (FMO2) Inspect also the fan motor 2 even if it is E48-1.
Page 111 '20 • KX-SM-354 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Low pressure 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 112 '20 • KX-SM-354 Green Error code Content Suction pipe temperature sensor anomaly (Tho-S), Keeps flashing Stays Off Indoor Remote control: E53/E55 7-segment display: E53/E55-1 Under-dome temperature sensor anomaly (Tho-C1) Keeps flashing 1 time ﬂash Outdoor E53: Tho-S, E55-1: Tho-C1 5. Troubleshooting 1.
Page 113 '20 • KX-SM-354 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 114 '20 • KX-SM-354 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 115 '20 • KX-SM-354 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 116 '20 • KX-SM-354 Green Error code Content Keeps flashing Stays Off Indoor Remote control: Compressor startup failure (CM1) 7-segment display: E59-1 Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating conditions.
Page 117 '20 • KX-SM-354 Green Error code Content Rotor position detection failure Keeps flashing Stays Off Indoor Remote control: (CM1) 7-segment display: E60-1 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 operating conditions.
Page 118 '20 • KX-SM-354 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 119 '20 • KX-SM-354 2.4 Outdoor unit control PCB replacement procedure 2.4 Outdoor unit control PCB replacement procedure PCB012D017G 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 WARNING proper safety procedures and instructions are not adhered to.
Page 120 '20 • KX-SM-354 Fan motor voltage measurement point (between L63, L64) PCB voltage measurement point (between F1, DS1(-)) Fig.1 Voltage measurement points Target PCB Appearance of the controller – –...
Page 121 '20 • KX-SM-354 2.5 Inverter PCB replacement procedure 2.5 Inverter PCB replacement procedure PCB012D018AB 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 WARNING proper safety procedures and instructions are not adhered to.
Page 122 '20 • KX-SM-354 Fan motor voltage measurement point (L63 - L64) Target pwb PCB voltage measurement point Pwb voltage measurement point PCB voltage measurement point (F1-DS(-)) Fig.1 Voltage measurement points Fig.1 Voltage Measurement Points Terminal Harness Snubber capacitor Inverter PCB Connection binder Power transistor (Metallic pillar)
Page 123 '20 • KX-SM-354  Function of DIP switch for control •SW5 (Function setting) •SW3 (Function setting) Switch Function ON/OFF Function Inspection LED reset Test run switch Test run SW3-1 SW5-1 Normal Test run switch Normal Forced cooling/heating Test run operation mode Cooling SW3-7 SW5-2 Normal...
Page 124 '20 • KX-SM-354 ●DIP Switch setting list (1) Outdoor unit (a) Control PCB Switch Description Default setting Remark Outdoor address No. (Order of 10) Outdoor address No. (Order of 1) Inspection LED reset Normal*/Reset Normal SW3-1 SW3-2 Spare Keep OFF Spare Keep OFF SW3-3...
Page 125 '20 • KX-SM-354 3. ELECTRICAL WIRING 2.3 Electrical wiring Models FDC224KXZME1, 280KXZME1, 335KXZME1A Models FDC224KXZME1, 280KXZME1 , 335KXZME1A PCB004Z397 – –...
Page 126 '20 • KX-SM-354 4. PIPING SYSTEM Model FDC224KXZME1, 280KXZME1, 335KXZME1A Accumulator Compressor Heat exchanger Heat exchanger – –...
Page 127 '20 • KX-SM-354 5. OUTDOOR UNIT DISASSEMBLY PROCEDURE OUTDOOR UNIT DISASSEMBLY PROCEDURE PCA012D087 PCA012D087 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 128 '20 • KX-SM-354 PROCEDURE & PICTURES 9. To remove the compressor (CM) Terminal cover (1) Remove the service panel.(See No.1) (2) Remove the insulation which covers compressors. (Strings (a) (d) should be loosen.) (3) Remove 3 terminal cover ﬁxing bolts( mark) and remove it and disconnect the power wiring.
Page 129 '20 • KX-SM-354 6. INDOOR UNIT DISASSEMBLY PROCEDURE 6. INDOOR UNIT DISASSEMBLY PROCEDURE PJF012D045 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 130 '20 • KX-SM-354 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 131 '20 • KX-SM-354 PJA012D792A PJA012D792A 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 132 '20 • KX-SM-354 PJA012D792A PROCEDURE & PICTURES 6. To remove the temperature sensors (example"Thi-R1") (1) Remove the lid of control box.(See No.1) (2) Disconnect the temperature sensor connector(CNNx). (3) Remove the drain pan.(See No.3) (4) Pull out the temperature sensor "Thi-R1" from the sensor holder. 7.
Page 133 '20 • KX-SM-354 PJB012D309 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 134 '20 • KX-SM-354 PROCEDURE & PICTURES 6. To remove the drain pump(DM) and ﬂoat 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 ﬂoat switch ﬁxing screw and remove it.( mark)
Page 135 '20 • KX-SM-354 PJC012D211 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 '20 • KX-SM-354 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 137 '20 • KX-SM-354 PJC012D311 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 '20 • KX-SM-354 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 139 '20 • KX-SM-354 PJG012D019 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 '20 • KX-SM-354 PROCEDURE & PICTURES 7. To remove the drain pump(DM) and ﬂoat 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 141 '20 • KX-SM-354 PJH012D004 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 '20 • KX-SM-354 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 143 '20 • KX-SM-354 PJC012D123 DISASSEMBLY PROCEDURE Precau afety Read these "Precau afety" carefully before star g 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 opera e booster capacitor.
Page 144 '20 • KX-SM-354 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 145 '20 • KX-SM-354 PHA012D402 PHA012D402 – –...
Page 146 '20 • KX-SM-354 Screw – –...
Page 147 '20 • KX-SM-354 – –...
Page 148 '20 • KX-SM-354 – –...
Page 149 '20 • KX-SM-354 PFA012D631 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 '20 • KX-SM-354 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 151 '20 • KX-SM-354 PGF012D007 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 '20 • KX-SM-354 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 153 '20 • KX-SM-354 PGD012D011 DISASSEMBLY PROCEDURE Precau afety Read these "Precau afety" carefully before star g 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 opera e booster capacitor.
Page 154 '20 • KX-SM-354 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 155 '20 • KX-SM-354 PCH012D018 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 '20 • KX-SM-354 PSC012D109 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 157 Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. 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. Copyright MITSUBISHI HEAVY INDUSTRIES, LTD.

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Kxz series Fdc280kxzme1 Fdc335kxzme1a