Mitsubishi Heavy Industries FDC280KXZPE1 Service Manual
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Mitsubishi Heavy Industries FDC280KXZPE1 Service Manual

Vrf inverter multi-system, outdoor units
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Manual No.'14
KX-SM-221
•
SERVICE MANUAL
VRF INVERTER MULTI-SYSTEM AIR-CONDITIONERS
KXZ Outdoor units
KXZP series
Single use
FDC224KXZPE1, 280KXZPE1
Note:
•
(1)Regarding the indoor unit series, refer to the No.'14･KX-DB-206.

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  • Page 1 Manual No.'14 KX-SM-221 • SERVICE MANUAL VRF INVERTER MULTI-SYSTEM AIR-CONDITIONERS KXZ Outdoor units KXZP series Single use FDC224KXZPE1, 280KXZPE1 Note: • (1)Regarding the indoor unit series, refer to the No.’14･KX-DB-206.
  • Page 2 '14 • KX-SM-221 CONTENTS 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ..... 1 1.1 Remote control (option parts) ..............1 1.2 Operation control function by the wired remote control ......4 1.3 Operation control function by the indoor control ........9 1.4 Operation control function by the outdoor control ........
  • Page 3 '14 • KX-SM-221 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1.1 Remote control (option parts) Wired remote control Model RC-EX1A All icons are shown for the sake of explanation. ⑦ Clock, R/C name display ⑤ LCD display (With backlight) A tap on the LCD lights the backlight. Displays the current time and The backlight turns off automatically if there is no the name of R/C...
  • Page 4 '14 • KX-SM-221 Wired remote control Model RC-E5 The figure below shows the remote control with the cover opened. Note that all the items that may be displayed in the liquid crystal display area are shown in the figure for the sake of explanation. Characters displayed with dots in the liquid crystal display area are abbreviated.
  • Page 5 '14 • KX-SM-221 Wireless remote control Indication section Indicates set temperature. Indicates the status of swing louver. Indicates selected operation with Indicates the selected airflow volume Indicates for two seconds when FILTER button is pressed. Indicates when ON-TIMER is set. Indicates when OFF-TIMER is set.
  • Page 6 '14 • KX-SM-221 1.2 Operation control function by the wired remote control Model RC-EX1A (1) Switching sequence of the operation mode switches of remote control (a) Tap the change operation mode button on the TOP screen. (b) When the change operation mode screen is displayed, tap the button of desired mode. (c) When the operation mode is selected, the display returns to the TOP screen.
  • Page 7 '14 • KX-SM-221 • Since it memorizes always the condition of remote control, it starts operation according to the contents of memory no sooner than normal state is recovered after the power failure. Although the auto swing stop position and the timer mode are cancelled, the weekly timer setting is restored with the holiday setting for all weekdays.
  • Page 8 '14 • KX-SM-221 Operation and setting from remote control ⑥ Operation and setting from remote control A: Refer to the instruction manual for RC-EX series. B: Refer to the installation manual for RC-EX series. C: Loading a utility software vie Internet ○: Nearly same function setting and operations are possible.
  • Page 9 '14 • KX-SM-221 ⑥ Operation and setting from remote control (continued) RC-EX RC-E4 Setting & display item Description series RC-E5 Ａ  11． Administrator settings [Administrator password] ・ Enable/Disable setting of operation can be set. [On/Off] [Change set temp.] [Change operation mode] [Change air flow direction] 1 Enable/Disable setting [Individual flap control setting][Fan speed] [High power operation] [Energy-saving operation] [Timer settings] [Weekly timer setting] Ａ ...
  • Page 10 '14 • KX-SM-221 Model RC-E5 Switching sequence of the operation mode switches of remote control COOL HEAT 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. Power failure compensation function (Electric power source failure) •...
  • Page 11 '14 • KX-SM-221 1.3 Operation control function by the indoor control Operations of functional items during cooling/heating Cooling Heating Operation Dehumidifying Thermostat Thermostat Thermostat Thermostat Hot start (Defrost) Functional item Compressor � � � � � � �/� 4-way valve �...
  • Page 12 '14 • KX-SM-221 (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 �...
  • Page 13 '14 • KX-SM-221 Thermostat ON i) When the heat exchanger thermistor (ThI-R or R, whichever higher) detects °C or lower, the fan is turned OFF and does not operate. ii) When the heat exchanger thermistor (ThI-R or R, whichever higher) detects °C or higher, the fan operates with the fan control at heating thermostat OFF.
  • Page 14 '14 • KX-SM-221 (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  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 '14 • KX-SM-221 (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 '14 • KX-SM-221 Filter sign As the operation time (Total ON time of ON/OFF switch) accumulates to 0 hours , “FILTER CLEANING” is displayed on the remote control. (This is displayed when the unit is in trouble and under the centralized control, regardless of ON/OFF) Note (1) T ime setting for the filter sign can be made as shown below using the indoor function of wired remote control “FILTER SIGN SET”. (It is set at TYPE 1 at the shipping from factory.) Filter sign setting...
  • Page 17 '14 • KX-SM-221 (12) Drain motor (DM) control 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. [ ＊ 2] Drain detection switch is turned “OFF” when the float switch “Close” is detected for 10 seconds continuously. It detects always from 0 seconds after turning the power ON. There is no detection of anomalous draining for 0 seconds after turning the drain pump OFF. Turning the drain detection switch “ON”...
  • Page 18 '14 • KX-SM-221 (15) Anomalous fan motor After starting the fan motor, if the fan motor speed is 200min or less is detected for 30 seconds continuously and 4 times within 60 minutes, then fan motor stops with the anomalous stop (E16). (b) If the fan motor fails to reach at -0(FDU: -00) min less than the required speed, it stops with the anomalous stop (E0).
  • Page 19 '14 • KX-SM-221 (a) Output for external control (remote display) Following output connectors (CnT) are provided on the indoor control PCB for monitoring operation status. ① Operation output: Outputs DCV signal for driving relay during operation ② Heating output: Outputs DCV signal for driving relay during heating operation ③...
  • Page 20 '14 • KX-SM-221 (19) Operation permission/prohibition (In case of adopting card key switches or commercially available timers) When the indoor function setting of wired remote control for “Operation permission/prohibition” is changed from “Invalid (Factory default)” to “ Valid”, following control becomes effective. ・...
  • Page 21 '14 • KX-SM-221 (b) In case of CnT ③ Operation permission/prohibition level + CnTA ③ Operation permission/prohibition level Operation permission Operation permission Operation Operation permission permission prohibition setting Operation CnTA Operation permission permission Operation Operation permission/ permission prohibition setting Operation Operation permission permission Operation permission/...
  • Page 22 '14 • KX-SM-221 (d) 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 selection External input method Operation External terminal input (CnT or CnTA) Cooling zone Heating zone...
  • Page 23 '14 • KX-SM-221 (26) Home leave mode (RC-EX1A only) When the unit is not used for a long period of time, the room temperature is maintained at a moderate leval, avoiding extremely hot or cool temperature. Cooling or heating is operated according to the outdoor temperature (factory setting °C for cooling, 0°C for heating) and the set temperature (factory setting °C for cooling, 0°C for heating) (b) Set temperature and indoor fan speed can be set by RC-EXA.
  • Page 24 '14 • KX-SM-221 '14 • KX-SM-221 1.4 Operation control function by the outdoor control 1.4 Operation control function by the outdoor control Normal control (A) Normal control Operation of major functional components under each operation mode Operation of major functional components under each operation mode Heating Operation mode Cooling/Dehumidifying...
  • Page 25 '14 KX-SM-221 '14 • KX-SM-221 (2) Compressor operation range (a) Maximum compressor frequency (Unit: rps) Heating Model Cooling A range B range B range A range Outdoor air temperature (℃) Minimum compressor frequency (Unit: rps) Heating Model Cooling A range B range  ...
  • Page 26 '14 KX-SM-221 '14 • KX-SM-221 (3) Outdoor fan control (a) Outdoor fan speed and fan motor rotation speed The 7th outdoor fan speed in the following table is specified as the rated speed. Under the normal control, the speeds up to 9th level are used. Cooling Heating Outdoor fan tap...
  • Page 27 '14 • KX-SM-221 (4) 　 Defrost control (a)　Temperature condition of defrosting (i) 　 S tart conditions (Standard specification or cold region specification can be selected by switching the jumper wire J.) Defrost operation will start, when outdoor unit whose compressor is operating under heating mode has satisfied all the following conditions. ) When  minutes of cumulative compressor operation time has passed since heating operation started. ) When  minutes of cumulative compressor operation time has passed since the previous defrosting ended. ) When  minutes has passed since the compressor turned ON from OFF status.
  • Page 28 '14 • KX-SM-221 (5) Protective control (a) High pressure protective control/error If the high pressure exceeds . MPa, the compressor speed is reduced gradually. It reduces to 0 rps at the lowest. If the high pressure still rises to . MPa, the compressor stops. (b) Low pressure protective control/error If the low pressure drops below 0. MPa, the compressor speed is reduced gradually.
  • Page 29 '14 • KX-SM-221 (B)　Optional controls • Functions of outdoor PCB connector CNS1 and CNZ1 ➀ CNS1 connector : By changing the allocation of external input functions [P07-"X"] on the 7-segment, following functions can be selected. Function No. "X" CNS short circuited CNS open “0” : Extemal operation input Operation permission Operation prohibition “” : Demand input Invalid Valid “”...
  • Page 30 '14 • KX-SM-221 (iv) When the control comand from remote control is not accepted (Under the condition of the system all stop status by external input), “Center” is dispalyed. See Item (v) mentioned below. (v) CnS performs the following operations depending on the short-circuit or open of the jumper wire (J). In case of pulse input, the pulse width is 00ms or larger.
  • Page 31 '14 • KX-SM-221 (iv) Demand control Demand ratio can be switched with the dip switches (SW-, -) on the outdoor PCB. SW-, SW- demand switching: 0 – Open,  – Short-circuit (Factory default is open) Compressor SW- SW- Out put(%) (v) The controls of -way valve safeguard, compressor protective start operation, defrost operation, oil equalized operation, oil return operation, pump-down operation for replacement, Start/Stop pump-down operation and check operation have priority over this control.
  • Page 32 '14 • KX-SM-221 '14 • KX-SM-221 (2) Silent mode control (a) Start conditions When all of the following conditions is established. (i)   At the start of silent mode initiated by the indoor unit or when the silent mode input is made effective (short-circuited) at the external input terminal (CnS1) on the outdoor unit.
  • Page 33 '14 • KX-SM-221 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 0 minutes continuously. Snow protection control setting is valid ([P0] - ) and outdoor air temperature < °C or external input of outdoor fan snow protection control ON.
  • Page 34 '14 • KX-SM-221 (5) Outdoor operation mode On the standard models of  pipe system, the outdoor operation mode of Stop/Cooling/Heating is selected based on the informa- tion of indoor units, and then respective controls are performed. <Contents of control> Determination of outdoor operation mode Operation mode of outdoor unit is determined based on respective signals of Operation/Stop and Cooling/Heating.
  • Page 35 '14 • KX-SM-221 ③ When it is changed from same mode to unmatch. Indoor unit 0 Stop Cooling Heating “Invalid operation” lamp flickers. Fan Indoor unit  Stop Cooling Cooling ④ Operation mode is prepared for change in the fan mode. Indoor unit 0 Stop Indoor unit  Stop Heating Heating <Last unit’s operation mode>...
  • Page 36 '14 • KX-SM-221 Forced cooling/heating operation (a) With this control, SW- on the outdoor PCB is turned ON and setting function [P0]-[] with -segment display so as to forcibly determined whether the indoor unit is operated for cooling or heating. (b) If any operation mode other than the forcible mode is commanded from indoor unit, the mode unmatch message is displayed on the remote control or others and operation enters in the FAN mode.
  • Page 37 '14 • KX-SM-221 Pump down operation control for removal of the 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) Start conditions This is implemented with the liquid service valve closed.
  • Page 38 '14 • KX-SM-221 (9) 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 39 '14 • KX-SM-221 (iii) Ending condition ① When the starting conditions are lost. (b) Compressor upper limit speed restriction for each operation capacity Starting condition (either of ① or ② ) ① When the external input assignment [P0] : Multi-system energy save operation = Valid and -segment [P] (Multi-system energy save control II) =  or  or  Factory default: 0 (OFF)/ (Setting ),  (Setting ),  (Setting ) ②...
  • Page 40 '14 • KX-SM-221 '14 • KX-SM-221 (C) Data output (1) 7-segment display and operation data retention (a) 7-segment display Operation information is displayed for checking various operation data during test run and for helping malfunction diag- nosis at servicing. Input data to microcomputer, contents of outdoor unit control, registration information of indoor units and etc.
  • Page 41 '14 • KX-SM-221 When Special display occurs [CXX] Special display Button operation When Special display reset No operation for 10 seconds* * If the special display is reset in the meanwhile, it remains [CXX]. [C49] Sub-cooling degree at cooling mode = High pressure saturated temperature ( ) detected with high pressure sensor (PHS) °C...
  • Page 42 '14 • KX-SM-221 < Operation information > Code Data display Minimum Contents of display Remarks range unit Unusual [Exx] code Warning [oPx][oPE-X] code Special [PdS][PdE] code [CH ][CHF][CO ][HE ][PCL][dLP] < Information for sensor or actuator value > CM1 operating frequency 0~130 Tho-A Atmosphere air temp.
  • Page 43 '14 • KX-SM-221 '14 • KX-SM-221 Code Data display Minimum Contents of display Remarks range unit < Information for outdoor unit > Number of connected indoor unit 0~80 Capacity ratio of connected indoor unit 0~999 Number of operation indoor unit 0~50 Required Fk total 0~999...
  • Page 44 '14 • KX-SM-221 '14 • KX-SM-221 Code Data display Minimum Contents of display Remarks range unit Displays No. of the error detection of which effect is the strongest among Compressor error causes 1 0~127 those occurred from the start of operation after the power on Displays No.
  • Page 45 '14 • KX-SM-221 '14 • KX-SM-221 Code Data display Minimum Contents of display Remarks range unit 0: External operation input 1: Demand input 2: Cooling/heating forced operation input 3: Silent mode input 1 4: — 0: (Factory default) 5: Outdoor fan snow protection control input CNS1 function assignment 6: Test run external input 1 (SW5-1 equivalent) 0 ~ 20...
  • Page 46 '14 • KX-SM-221 '14 • KX-SM-221 [C66] Control status <Definition of signal> Shows the status of control in operation currently. If two or more controls among the following protection controls are established simultaneously, No. of the control of which number is larger is displayed.
  • Page 47 '14 • KX-SM-221 '14 • KX-SM-221 [C68] Compressor stop causes <Definition of signal> Shows the latest compressor stop cause counted from right now. (Excluding the ordinary stop, etc.) Output of the No. is retained till next compressor stop cause occurs. Compressor stop causes Number No history...
  • Page 48 '14 • KX-SM-221 '14 • KX-SM-221 (b) Saving of Operation Data For the purpose to investigate the cause of trouble in the field, the operation data are always saved in the memory, and if the trouble occurs, the data writing is stopped and the operation data prior to the trouble occurrence are recorded. These data can be retrieved to personal computer through RS232C connector on the outdoor control PCB and utilized for investigating the cause.
  • Page 49 '14 • KX-SM-221 '14 • KX-SM-221 Record data Code Write-in contents Data write-in Number of Write-in unit Contents range bytes Heating operation 1-speed Heating operation 2-speed Heating operation 3-speed Heating operation 4-speed Heating operation 5-speed Heating operation 6-speed Indoor unit 1 Demand frequency 0~255 Indoor unit 1 Answer frequency 0~255...
  • Page 50 '14 • KX-SM-221 '14 • KX-SM-221 Record data Code Write-in contents Data write-in Number of Write-in unit Contents range bytes Tho-H Sub-cooling coil temp. 2 -40~75 0.01°C Injection suction pipe temp. 1 (spare) -40~75 0.01°C Tho-J Receiver liquid surface detection -40~75 0.01°C temp.
  • Page 51 '14 • KX-SM-221 '14 • KX-SM-221 Record data Code Write-in contents Data write-in Number of Write-in unit Contents range bytes Under-dome super heat CM1 0~25.5 0.1deg — — Spare Target FK 0~65535 Inverter CM1 operation frequency 0~255 Spare — — FMo1 rotation command 0~2550 10min...
  • Page 52 '14 • KX-SM-221 '14 • KX-SM-221 Record data Code Write-in contents Data write-in Number of Write-in unit Contents range bytes < Compressor > Compressor 1 cumulative operating time (estimate) 0~65535 Spare — — Compressor 1 start times 0~65535 20times Spare —...
  • Page 53 '14 • KX-SM-221 '14 • KX-SM-221 Record data Code Write-in contents Data write-in Number of Write-in unit Contents range bytes 0: Normal Outdoor heat exchanger Bit3 refrigerant purge 1: Practice 0: Normal Indoor heat exchanger Bit4 refrigerant purge 1: Practice 0: Normal Evaporative air handling Bit5...
  • Page 54 '14 • KX-SM-221 '14 • KX-SM-221 Record data Code Write-in contents Data write-in Number of Write-in unit Contents range bytes — Protection control causes 1 0~127 Protection control causes 2 0~127 — — Protection control causes 3 0~127 Compressor stop causes 0~127 —...
  • Page 55 '14 • KX-SM-221 '14 • KX-SM-221 Record data Code Write-in contents Data write-in Number of Write-in unit Contents range bytes Compressor error causes 2 0~127 — Compressor error causes 3 0~127 — Version (Initial value FFh ) — — INV 1 information —...
  • Page 56 '14 • KX-SM-221 '14 • KX-SM-221 Record data Code Write-in contents Data write-in Number of Write-in unit Contents range bytes Bit0 SW6-1 0: OFF 1: ON — — Bit1 DIP SW [SW6] SW6-2 0: OFF 1: ON Bit2 0: OFF 1: ON SW6-3 Bit3 SW6-4...
  • Page 57 '14 • KX-SM-221 (2) Outdoor PCB setting (a) Control PCB Code Input Remarks Outdoor address No. (Order of 10) Outdoor address No. (Order of 1) SW3-1 Inspection LED reset Normal★/Reset SW3-2 Existing pipe control SW None★/Existing SW3-3 SW3-4 Spare Keep OFF SW3-5 SW3-6 Forced cooling/heating...
  • Page 58 '14 • KX-SM-221 (3) Indoor PCB setting Code Input Default setting Remarks Indoor unit address No.(Order of 10) Indoor unit address No.(Order of 1) Outdoor unit address No.(Order of 10) Outdoor unit address No.(Order of 1) SW5-1 Superlink selection Automatic*/Previous SL Automatic SW5-2 Indoor unit address No.(Order of 100)
  • Page 59 '14 • KX-SM-221 2. SYSTEM TROUBLESHOOTING PROCEDURE 2.1 Basics of troubleshooting Basic troubleshooting is to check/analyze/save data by connecting the Mente PC. Whenever arriving at the site, always connect the Mente PC before starting work. Method of error data analysis (Basic procedure) •...
  • Page 60 '14 • KX-SM-221 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 61 '14 • KX-SM-221 (c) Inverter checker for diagnosis of inverter output Checking method 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 the checker to the terminal of disconnected wires (U, V, W) from compressor respectively.
  • Page 62 FDC224KXZPE1,280KXZPE1 LED1 (Yellow) Check Outdoor unit check points 1 - time flash : Current cut (IPM) ● 2 - times flash: Power transister Check items with the mark when the power is ON. ※ overheat 3 - times flash: Anomalous compressor Noise filter check: Fuse check: There should by less of synchronism...
  • Page 63 '14 • KX-SM-221 2.3 Contents of troubleshooting (a) List of inspection displays Indoor and outdoor units Remote 7-segment control Name of inspection Classification Page display error code – Remote control communication error Communication error – Duplicated indoor unit address Address setting error – Outdoor unit signal line error Address pairing setting error –...
  • Page 64 '14 • KX-SM-221 (b) Troubleshooting Green Error code Content Keeps flashing Stays OFF None Indoor Operates but does not cool Remote control: 7-segment display: – Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor fan operation. Check the temperature difference between return and suction air of indoor unit.
  • Page 65 '14 • KX-SM-221 Green Content Error code Keeps flashing Stays OFF Indoor None Operates but does not heat Remote control: 7-segment display: – Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor fan operation. Check the temperature difference between return and suction air of indoor unit.
  • Page 66 '14 • KX-SM-221 Green Error code Content Stays OFF Stays OFF Stays OFF None Indoor Earth leakage breaker activated Remote control: 7-segment display: – Stays OFF Stays OFF Stays OFF Outdoor 5.Troubleshooting 1.Applicable model All models Diagnosis Countermeasure Are the insulation resistance Replace compressor.
  • Page 67 '14 • KX-SM-221 Green Content Error code – – Indoor None Excessive noise/vibration (1/3) Remote control: 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 68 '14 • KX-SM-221 Green Content Error code – – Indoor None Excessive noise/vibration (2/3) Remote control: 7-segment display: – – – Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure From previous page Rearrange the piping to Are the pipes avoid contact with the contacting with the casing.
  • Page 69 '14 • KX-SM-221 Green Content Error code – – Indoor None Excessive noise/vibration (3/3) Remote control: 7-segment display: – – – Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure From previous page If insufficient cooling/ [Adjustment heating problem happens during commissioning] due to anomalous operating Does noise/vibration occur when the...
  • Page 70 '14 • KX-SM-221 Green Content Error code Keeps flashing Stays OFF Indoor None Louver motor anomaly Remote control: 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 71 '14 • KX-SM-221 Green Power source system anomaly Content Error code Stays OFF Stays OFF Indoor None Remote control: (Power source to indoor unit PCB) 7-segment display: Stays OFF 2-time flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure AC 220-240V/220V detected between L-N on...
  • Page 72 '14 • KX-SM-221 Green Content Error code Power source system error Stays OFF Keeps lighting Indoor None Remote control: (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 73 '14 • KX-SM-221 Green Content Error code WAIT Indoor Keeps flashing Stays OFF Remote control: 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 minutes is kept on WAIT...
  • Page 74 '14 • KX-SM-221 Green Content Error code 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 75 '14 • KX-SM-221 Green Content Error code Keeps flashing Stays OFF Indoor Remote control: WAIT WAIT 7-segment display: Keeps flashing Keeps flashing Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (No display on the remote control after power ON.) No display on the remote control after power ON.
  • Page 76 '14 • KX-SM-221 Green Content Error code Keeps flashing Stays OFF Indoor Remote control: WAIT WAIT 7-segment display: – Keeps flashing Keeps flashing Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (In case that is kept WAIT on displaying on the remote control for more than 2 minutes is kept on WAIT...
  • Page 77 '14 • KX-SM-221 Green Content Error code Stays OFF Stays OFF Indoor Remote control: WAIT WAIT 7-segment display: Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (In case that LED on outdoor control PCB stays OFF.) In case that LED on outdoor control PCB stays OFF.
  • Page 78 '14 • KX-SM-221 Green Content Error code Stays OFF Stays OFF Indoor Remote control: WAIT WAIT 7-segment display: – Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (In case of fuse blown, how to check the unit before replacement of fuse.) From previous page.
  • Page 79 '14 • KX-SM-221 Green Content Error code Stays OFF Stays OFF Indoor Remote control: [No display] [No display] 7-segment display: Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure (No display on the remote control after power ON.) No display on the remote control after power ON.
  • Page 80 '14 • KX-SM-221 Green Content Error code 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 noise.
  • Page 81 '14 • KX-SM-221 Green Content Error code Keeps flashing Keeps flashing Indoor Duplicated indoor unit address Remote control: – 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 82 '14 • KX-SM-221 Green Content Error code Keeps flashing 2-time flash Indoor E3/5 Outdoor unit signal line error Remote control: – 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 83 '14 • KX-SM-221 Green Content Error code Keeps flashing *See below Indoor Communication error during operation Remote control: – 7-segment display: Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure * In case that indoor red LED flashes 2 times Note (1) Check the connection (disconnection, looseness) of signal wires at outdoor terminal block.
  • Page 84 '14 • KX-SM-221 Green Indoor heat exchanger Content Error code Keeps flashing 1-time flash Indoor Remote control: temperature thermistor 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 thermistor connected securely.
  • Page 85 '14 • KX-SM-221 Green Indoor return air Content Error code Keeps flashing 1-time flash Indoor Remote control: temperature thermistor 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 thermistor connected securely.
  • Page 86 '14 • KX-SM-221 Green Content Error code Keeps flashing 1-time flash Indoor Drain trouble Remote control: – 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 87 '14 • KX-SM-221 Green Content Error code Excessive number of indoor units (more than 17 units) Keeps flashing Stays OFF Indoor Remote control: by controlling one remote control – 7-segment display: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...
  • Page 88 '14 • KX-SM-221 Green Green Content Error code Content Error code Address setting error between Address setting error between Keeps flashing Stays OFF Indoor Remote control: Remote control: master and slave indoor units Indoor master and slave indoor units Keeps flashing Keeps flashing –...
  • Page 89 '14 • KX-SM-221 Green Content Error code 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 '14 • KX-SM-221 Indoor DC fan motor anomaly Green Error code Content 1(2)-time Indoor Remote control: E16 (FDT, FDTC, FDTW, FDTS, FDU, FDUM 7-segment display: - FDUT71, FDK, FDFW, FDU-F series) Outdoor Stays OFF Note (1) Value in (  1.Applicable model FDT, FDTC, FDTW, FDTS, Diagnosis Countermeasure...
  • Page 91 '14 • KX-SM-221 Green Content Error code Address setting error of Keeps flashing 1-ime flash Indoor Remote control: master and slave indoor units – 7-segment display: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the address setting for the master indoor Correct the address setting of...
  • Page 92 '14 • KX-SM-221 Green Content Error code Indoor unit operation check, Keeps flashing 1-time flash Indoor Remote control: drain 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 '14 • KX-SM-221 Indoor DC fan motor Green Error code Content rotation speed anomaly 1(2)-time Indoor Remote control: E20 (FDT, FDTC, FDTW, FDTS, FDU, FDUM 7-segment display: - Outdoor Stays OFF FDUT71, FDK, FDFW, FDU-F series) Note (1) Value in (  1.Applicable model FDT, FDTC, FDTW, FDTS, Diagnosis...
  • Page 94 '14 • KX-SM-221 Green Content Error code Defective panel switch Keeps flashing 1-time flash Indoor Remote control: operation (FDT) – 7-segment display: – Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model FDT series only Diagnosis Countermeasure Reset the error and close Is grill opened? the grill.
  • Page 95 '14 • KX-SM-221 Green Content Error code Remote control Keeps flashing Stays OFF Indoor Remote control: temperature thermistor 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 thermistor connected securely.
  • Page 96 '14 • KX-SM-221 Green Content Error code Keeps flashing Stays OFF Indoor Duplicated outdoor unit address No. Remote control: 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 '14 • KX-SM-221 Green Content Error code 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 98 '14 • KX-SM-221 Green Discharge pipe temperature Content Error code Keeps flashing Stays OFF Indoor Remote control: error (Tho-D) 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 Save data for 30 minutes before stopping in Mente PC.
  • Page 99 '14 • KX-SM-221 Outdoor heat exchanger Green Content Error code temperature thermistor (Tho-R) and subcooling coil Keeps flashing Stays OFF Indoor Remote control: temperature thermistor (Tho-SC,-H) anomaly 7-segment display: Keeps flashing Outdoor *1 1-time flash : Tho-R, 5-time flash : Tho-SC, 6-time flash : Tho-H 5.
  • Page 100 '14 • KX-SM-221 Green Outdoor air temperature Content Error code Keeps flashing Stays OFF Indoor Remote control: thermistor anomaly (Tho-A) 7-segment display: – Keeps flashing 1-time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check and save the data of operating condition.
  • Page 101 '14 • KX-SM-221 Green Content Error code Discharge pipe temperature Keeps flashing Stays OFF Indoor Remote control: thermistor anomaly (Tho-D) 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 102 '14 • KX-SM-221 Green High pressure anomaly Content Error code Keeps flashing Stays OFF Indoor Remote control: (63H1 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 '14 • KX-SM-221 Green Content Error code Keeps flashing Stays OFF Indoor E41(E51) Remote control: Power transistor overheat E41(E51)-1, 2*1 7-segment display: Keeps flashing Outdoor *1 E41-1 (E51-1) : CM1, E41-2 (E51-2) : CM2 *2 E41-1 (E51-1) : 1-time flash, E41-2 (E51-2) : 2-time flash 5.
  • Page 104 '14 • KX-SM-221 Green Content Error code Keeps flashing Stays OFF Indoor Remote control: Current cut (CM1) 7-segment display: – Keeps flashing 1-time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Save data for 30 minutes before stopping in Mente PC. Check, record operating condition.
  • Page 105 '14 • KX-SM-221 Green Content Error code Excessive number of indoor units connected, Keeps flashing Stays OFF Indoor Remote control: excessive total capacity of connection 7-segment display: Keeps flashing Outdoor *1 1-time flash: Excessive number of indoor units connected, 2-time flash:Excessive capacity of connection 5.
  • Page 106 '14 • KX-SM-221 Green Content Error code Liquid flooding anomaly Keeps flashing Stays OFF Indoor Remote control: (CM1) 7-segment display: – Keeps flashing 1-time 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.
  • Page 107 '14 • KX-SM-221 Green Content Error code Communication error between Keeps flashing Stays OFF Indoor Remote control: inverter PCB and outdoor control PCB 7-segment display: Keeps flashing 1-time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check, record operating condition. Save data for 30 minutes before stopping in Mente PC.
  • Page 108 '14 • KX-SM-221 Green Content Error code 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 109 '14 • KX-SM-221 Green Content Error code Keeps flashing Stays OFF Indoor Remote control: Outdoor DC fan motor anomaly(1/2) 7-segment display: Keeps flashing Outdoor *1 1-time flash : FMo1, 2-time flash : FMo2 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Is fan motor power...
  • Page 110 '14 • KX-SM-221 Green Content Error code Keeps flashing Stays OFF Indoor Remote control: Outdoor DC fan motor anomaly(2/2) 7-segment display: – Keeps flashing Outdoor *1 1-time flash : FMo1, 2-time flash : FMo2 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure From previous page...
  • Page 111 '14 • KX-SM-221 Green Content Error code 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 Save data for 30 minutes before stopping in Mente PC.
  • Page 112 '14 • KX-SM-221 Green Content Error code Suction pipe temperature thermistor anomaly (Tho-S), Keeps flashing Stays OFF Indoor E53/E55*1 Remote control: E53/E55 E53/E55 Under-dome temperature thermistor anomaly (Tho-C) 7-segment display: – Keeps flashing 1-time flash Outdoor *1 E53 : Tho-S, E55 : Tho-C 5.
  • Page 113 '14 • KX-SM-221 Green Content Error code High pressure sensor anomaly (PSH) Keeps flashing Stays OFF Indoor Remote control: Low pressure sensor anomaly (PSL) 7-segment display: Keeps flashing Outdoor *1 1-time flash : PSL, 2-time flash : PSH 5. Troubleshooting 1.
  • Page 114 '14 • KX-SM-221 Green Content Error code Anomalous compressor Keeps flashing Stays OFF Indoor Remote control: by loss of synchronism 7-segment display: – Keeps flashing 1-time flash Outdoor 5. Troubleshooting 1. Applicable model Outdoor unit Diagnosis Countermeasure Check, record operating condition. Save data for 30 minutes before stopping in Mente PC.
  • Page 115 '14 • KX-SM-221 Green Compressor startup Content Error code Keeps flashing Stays OFF Indoor Remote control: failure (CM1) 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 116 '14 • KX-SM-221 Green Content Error code 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.
  • Page 117 '14 • KX-SM-221 '14 • KX-SM-221 2.4 Outdoor unit control PCB replacement procedure PCB012D046B 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 WARNING if proper safety procedures and instructions are not adhered to.
  • Page 118 '14 • KX-SM-221 '14 • KX-SM-221 Connectors are not After elapsing 3 minutes half inserted from power OFF Target PCB Control PCB voltage measurement point (DC) (Pin terminals 1-3 of CNA1) Fig.2 Voltage measurement point – –...
  • Page 119 '14 • KX-SM-221 2.5 Outdoor unit inverter PCB replacement procedure PCB012D057A 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: WARNING Indicates an imminently hazardous situation which will result in death or serious injury if proper safety procedures and instructions are not adhered to.
  • Page 120 '14 • KX-SM-221 (A) Power source for control PCB : CNA1, 1 3pin or CNA2, 1 - 4pin (−) (＋) (＋) (−) ※ ： Presence and shape of electric component may vary according to a model. (＋) (＋) (−) (−) (B) Power source for fan motor (DC) : CNA2, 1 - 3pin or CNA1, 1 - 4pin Fig.2 Voltage measurement points ※：...
  • Page 121 '14 • KX-SM-221 (C) Voltage measurement point of power source for inverter : DM(+) – DM(–) Inverter PCB Snubber capacitor Fig. 4 Installationplace of inverter PCB Snubber capacitor Terminal Harness Inverter PCB Power transistor Connection binder (Metallic pillar ) Procedure on tightening harness (Snubber capacitor) and power transistor with screw. A metallic connection binder is set in each hole of the inverter PCB of "P", "N", "U", "V", and "W"...
  • Page 122 '14 • KX-SM-221 PCB012D056A 2.6 Outdoor unit converter PCB replacement procedure 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: WARNING Indicates an imminently hazardous situation which will result in death or serious injury if proper safety procedures and instructions are not adhered to.
  • Page 123 '14 • KX-SM-221 Voltage measurement points (Pin terminals 1 -3 of CNA3) ( ＋) ( －) Target PCB Fig.2 Voltage measurement points – –...
  • Page 124 '14 • KX-SM-221 '14 • KX-SM-221 2.7 Outdoor unit transistor module replacement procedure PCB012D043C 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 safety WARNING ！...
  • Page 125 '14 • KX-SM-221 '14 • KX-SM-221 2.8 Outdoor unit diode module replacement procedure PCB012D009C 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 safety WARNING ！...
  • Page 126 '14 • KX-SM-221 '14 • KX-SM-221 Function of connection ■ (1) Control PCB input (2) Control PCB output Mark Function Mark Function Connector Connector Tho-A CNTH Outdoor air thermistor 52X2 CNM1 Solenoid for CM1 Tho-R1 CNTH Heat exchanger thermistor 1 (Capillary) CNN1 4-way valve Tho-D CNTH...
  • Page 127 POWER SOURCE   3 Phase 380−415V 50Hz／380V 60Hz POWER PWB F1 （ 6.3A） F2 （ 4A） PWB4 52X2-1 52X2-2 INVERTER PWB PWB2 CNW1 CNA4 CNA3 52X2-3 52X2-4 （BK） （PK） （WH） F （ 3.15A） （WH） N／F PWB PWB3 52X1-1 52X1-2 3〜 52X1-3 52X1-4 （WH） 52X1 LED1 CHECKER （WH） FMo1 FMo2 EXTERNAL CNE （...
  • Page 128 Outdoor unit Service valve Check joint Thermistor Muffler Gas line Heat （Tho-A） exchanger Thermistor (Exit) 4way valve (20S) （Thi-R3） Thermistor (Bend) （Thi-R1） High pressure  switch （ 63H1） High pressure  Low pressure  Heat sensor (PSH) exchanger sensor (PSL) Indoor unit Check valve Thermistor （Thi-A） separator Strainer Thermistor (Entrance) Thermistor Thermistor （Thi-R2） Electronic  Strainer （Tho-D1） Strainer expansion valve （Tho-S） Sub-cooling coil Thermistor (Exit) （Thi-R3）...
  • Page 129 '14 • KX-SM-221 5. APPLICATION DATA 5.1 Installation of outdoor unit Designed for R410A refrigerant KXZ SERIES INSTALLATION MANUAL ● PCB012D053D ● Outdoor unit capacity ● FD C22 4, 280 ● ● ◎ espective installation manuals supplied with the units.
  • Page 130 '14 • KX-SM-221 Notabilia as a unit designed for R410A Dedicated R410A tools a） Gauge manifold Do not use any refrigerant other than R410A. R410A will rise to pressure about 1.6 times higher than that of a conventional refrigerant. ● b）...
  • Page 131 You may incur property damage or personal injure from a fall of the article. Do not step onto the outdoor unit. ● You may incur injury from a drop or fall. ● Do not clean up the unit with water ●...
  • Page 132 Fasten with anchor bolts '14 • KX-SM-221 (3) Pipe size selection Branch pipe set for indoor unit side Header set for indoor unit side Outdoor unit Model: HEAD Model: DIS Branch pipe set for indoor unit side Model: DIS Indoor unit n L4 uring Fig１...
  • Page 133 '14 • KX-SM-221 4-2. Piping work (1) Pipe connecting position and pipe outgoing direction Block terminal for power cable Legend A Attached pipe connecting outlet at refrigerant gas side (φ19.05 Flare) E Power cable outlet (Back side)(φ50) B Pipe connection outlet at liquid refrigerant side (φ9.52 Flare) F Refrigerant pipe and Power cable outle (4 places) C Power cable outlet (Front side, Right side)(φ30 2places) G Drain outlet (φ20 3places)
  • Page 134 '14 • KX-SM-221 Operation valve size Tightening torque Tightening angle Recommended length of tool handle (N ・ m) Do not hold the valve cap area with a spanner. (mm) (° ) (mm) ø 6.35 （1/4"） 14〜18 45〜60 ø 9.52 （3/8"） 34〜42 30〜45 ø...
  • Page 135 φ φ φ 15.88 15.88 19.7 15.88 '14 • KX-SM-221 (2) Vacuuming 5. DR Pull the air from the check joints of the operation valves on both liquid and gas sides. Airtighteness test completed ● Vacuuming begins When the system has remaining moisture Run the vacuum pump for at least one hour after the vacuum gauge shows inside or a leaky point, the vacuum gauge -101kPa or lower.
  • Page 136 ・Open the valve stem till it hits the stopper. No need to apply ・After the adjustment, replace the cap as it force more than that. was. ・ After the adjustment, replace the blind nut as it was. '14 • KX-SM-221 5.
  • Page 137 When units of FD○△△KXE6 Series, FD○△△KXZ series and units of FD○A△△KXE4 and 5 Series are connected in a mixture: Standard resistance value=46,000/[(Number of connected FD ○ A △△ KXE4 and 5 Series units x 5) + (Number of connected FD ○△△ KXE6 and KXZ Series units x 9)] The number of connected units includes those of indoor units, outdoor units and SL devices.
  • Page 138 '14 • KX-SM-221 Power cable and signal cable connection Power souce, signal line and ground terminal block Grounding terminal Do not connect to the grounding wire from another unit, but install a ● dedicated wire up to the grounding wire from the distribution board. nt to Wiring clamp ease...
  • Page 139 '14 • KX-SM-221 Outdoor unit Outdoor unit Outdoor unit Outdoor unit Outdoor unit Outdoor unit Network connector Network connector A1 ・ B1 A2 ・ B2 A1 ・ B1 A2 ・ B2 A1 ・ B1 A2 ・ B2 A1 ・ B1 A2 ・ B2 A1 ・...
  • Page 140 '14 • KX-SM-221 (1) In the case of a single refrigerant system installation ① Outdoor unit address setting Set as follows before you turn on power. Make sure that the Outdoor Unit No. switch is set to 49 (factory setting) ②...
  • Page 141 '14 • KX-SM-221 ［STEP1］ ［STEP2］ Outdoor unit [01] Outdoor unit [02] Outdoor unit [01] Outdoor unit [02] Start [01] Start [04] Number [03] Number [03] Refrigerant pipe Indoor unit Indoor unit Indoor unit Indoor unit （00） +01 （00） +04 Signal line Indoor unit Indoor unit Indoor unit...
  • Page 142 '14 • KX-SM-221 Item Operation Display [I/U 001 O/U 01▲」 ④ Pressing the switch will change the display indication cyclically to show the unit No.’s Selecting an indoor unit ⇔[I/U 002  O/U 01  ] to be changed address of the indoor units connected to the remote control and the unit No.’s of the outdoor units ⇔[I/U 003  O/U 01  ] connected with them.
  • Page 143 '14 • KX-SM-221 7-2. Selection switching Contents of control for outdoor unit can be changed with dipswitches on PCB and P○○ on 7-segment indicator. When changing P○○ on 7-segment indicator, it can be set by holding down SW8 (7-segment indicator UP: Ones digit), SW9 (7-segment indicator UP: Tens digit) and SW7 (Data write/Enter). Content of control Control selecting method SW setting on PCB...
  • Page 144 ・Plural outdoor units are exist as same address in same network. Duplicating outdoor unit address. ・ Incorrect setting. Automatic address setting and manual address setting are mixed. '14 • KX-SM-221 7-5. Demand control setting ● The demand control setting allows cutting the power peak, by suppressing the operating capacity of outdoor unit. Demand ratio is the rate of the maximum capacity relative to the rated capacity.
  • Page 145 '14 • KX-SM-221 5.2 Method for connecting the accessory pipe PSC012D028C ● Be sure to use the accessory pipe to connect the operation valve on the gas side with the field pipe. ● Be sure to ues the straight pipe (Procured at the field) shown in the table 1 applicable to the model  ...
  • Page 146 '14 • KX-SM-221 【Connection example Ⓐ〜Ⓓ applicable to the connecting direction.】 ● The piping angle shown below is an example in case of 15mm of heat insulating material.   Adjust an angle, according to the thickness of heat insulating material.  ...
  • Page 147 '14 • KX-SM-221 5.3 Instructions for installing the branch pipe set PSB012D855D ◎ This manual describes the specifications of branching pipe set and header set installation. For outdoor unit installation and indoor unit installation, please refer to the respective installation manuals supplied with your outdoor unit and indoor unit. ◎...
  • Page 148 '14 • KX-SM-221 Branching pipe set type Gas side Liquid side Different diameter pipe joint 35  HEAD4-22-1G None IDφ12.7   IDφ9.52  375  415  135  HEAD6-180-1G IDφ 15.88    1 pc. 1 pc. 540  IDφ9.52   545  90  HEAD8-371-2 IDφ15.88   IDφ12.7    1 pc. 1 pc.
  • Page 149 '14 • KX-SM-221 ・In the case of a header set (model type HEAD) Gas side Horizontal Floor surface Floor surface Floor surface Horizontal Iiquid side Horizontal Floor surface Floor surface Floor surface ④ When using the outdoor unit s branch pipe set, make sure to secure a straight section of 500 mm or more for both the gas and liquid pipes before branching them. Outdoor unit 1 Outdoor unit 2 Outdoor unit 3 Outdoor unit’s branch pipe 1 Outdoor unit’s branch pipe 2...
  • Page 150 '14 • KX-SM-221 Total capacity downstream Header set model type Number of branches less than 180 HEAD4-22-1G Up to 4 branches 180 or higher – less than 371 HEAD6-180-1G Up to 6 branches 371 or higher – less than 540 HEAD8-371-2 Up to 8 branches 540 or more...
  • Page 151 VRF INVERTER MULTI-SYSTEM AIR-CONDITIONERS Air-Conditioning & Refrigeration Division 16-5, Konan 2-chome, Minato-ku, Tokyo, 108-8215 Japan http://www.mhi.co.jp Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. Copyright MITSUBISHI HEAVY INDUSTRIES, LTD.

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