Mitsubishi Heavy Industries R410A Service Manual

Mitsubishi Heavy Industries R410A Service Manual

Split system/multi system
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  • Page 3 MITSUBISHI HEAVY INDUSTRIES - PAC SERVICE MANUAL INDEX MAINTENANCE DATA ERROR CODES PCB INDOOR UNITS ERROR DISPLAY & REMEDY CHART PCB OUTDOOR UNITS ERROR DISPLAY – OUTDOOR UNIT OPERATIONAL DATA CHECK – WIRED CONTROLLER REMOTE CONTROL – WIRED - SETTING FUNCTIONS ERROR DISPLAY –...
  • Page 4: Maintenance Data

    The evacuation is a procedure to purge impurities, such as noncondensable gas, air, moisture from the refrigerant equipment by using a vacuum pump. Since the refrigerant R410A is very insoluble in water, even a small amount of moisture left in the refriger- ant equipment will freeze, causing what is called ice clogging.
  • Page 5: Trouble Shooting For Refrigerant Circuit

    (2) Refrigerant charging After the evacuation shown in the above, change the connection of the charge hose A to the refrigerant cylinder. Purge air from the charge hose A . First loosen the connecting portion of the charge hose at the gauge manifold side and open valve 3 for a few seconds, and then immediately retighten it after observing that gas has blown out from loosened connecting portion.
  • Page 8 (b) Display sequence of error, inspection display lamp 1) One kind error Display corresponding to the error is shown. 2) More than one errors. Section Display section • Displays the error of higher priority (When plural errors are persisting) Error code of remote controller ···········...
  • Page 9 4) Recording and reset of error Error display Memory Reset Error code of remote • Saves in memory the mode of higher • Stop the unit operation by pressing the ON/OFF switch of remote controller priority controller. • Operation can be started again if the error has been reset. Indoor unit inspection lamp •...
  • Page 10 Parts layout on the indoor unit PCB Model: FDT series Fan motor To power supply (151~401) (CNW7) To power supply PCB (501, 601) (CNW9) CNW7 Louver motor CNM3 Fan motor CNW9 (501, 601) 52X8-1 52X7 52X6 52X1 52X2 52X3 PC2 PC1 52X4 Power supply PCB (CNW8)
  • Page 11 Model: FDEN series PCB power supply connector (Primary side) Power supply CNW1 CNW0 CNM1 PCB power supply connector (Secondary side) Remote controller Fan motor DIP switch (SW5) J5, J6 SW10 (SW8) CNH CNN1 J1~J4 (SW7) DIP switch (SW9) Address switch Connector J9~J11 (SW2)
  • Page 12 Model: FDKN series This diagram shows the PCB for the 151~251. The component layout on the 301 PCB is different, but the functions are the same. Heat exchanger thermistor, Return air thermistor Remote controller Heat exchanger thermistor (Thl-R1, Thl-A) (Thl-R2) TB,3 Dip switch (SW5)
  • Page 13 Model: FDUR series Heat exchanger thermistor, Return air thermistor Address swith (Thl-R1, Thl-A) (SW8) (SW2) Heat exchanger thermistor DIP switch DIP switch (Thl-R2) (SW5) (SW9) Float switch Remote controller J10~J11 J1~J4 Connector (SW10) (SW7) (CNT) CNN1 CNN2 SW10 Drain motor LED2 LED1 52X3...
  • Page 14 (c) Check method when the error code is display Remote controller or Indication board: Inspection LED, error code Indoor unit PCB: Red LED (inspection display), Green LED (CPU. normal display) Outdoor unit PCB: ARed LED (inspection display), Green LED (CPU. normal display) Error display : No display [Power supply line error] LCD display : No display...
  • Page 15 Indoor unit Outdoor unit Red LED 3 time flash Red LED Stays OFF Keeps flashing Keeps flashing Green LED Green LED Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only. Remote controller wiring Correction connect check (Red·...
  • Page 16: Error Display

    Indoor – outdoor communications trouble ” Error display “ WAIT (Initial (when the power is turned on) Indoor unit Outdoor unit Red LED Stays OFF Red LED 2 time flash Green LED Keeps flashing Green LED Keeps flashing Notes (1) If trouble occurs during communications, the error code E5 is displayed (Outdoor, Red LED flashes 2 times).
  • Page 17 Error display [Communication error between remote controller~Indoor unit] Indoor unit Outdoor unit Red LED Stays OFF Red LED Stays OFF Green LED Keeps flashing Green LED Keeps flashing Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only. Voltage between X and Z Replacement remote...
  • Page 18 Error display [Defective indoor unit heat exchanger thermistor] Indoor unit Outdoor unit Return air thermistor (Th Stays OFF Red LED 1 time flash Red LED Indoor unit heat exchanger thermistor Keeps flashing R1, R2) Green LED Keeps flashing Green LED Resistance temperature characteristics Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.
  • Page 19 Error display [Heating overload] Indoor unit Outdoor unit Stays OFF Red LED 1 time flash Red LED Keeps flashing Green LED Keeps flashing Green LED Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only. Notes (1) Check if the overload state exists or not using the following check points.
  • Page 20 [Control of 1 remote controller VS multiple units Error display : Excessive number of units (more than 17 units) ] Indoor unit Outdoor unit Stays OFF Red LED Stays OFF Red LED Keeps flashing Green LED Keeps flashing Green LED Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.
  • Page 21 S Only case of FDKN Only case of 151~251 types Abnormal data check with remote controller After check reset, fan runs on Me. Fan ON? 3 (Black) is GND. Check the Replacement indoor 1 and 3 (Red – Black) Was it reproduced? circumstances.
  • Page 22 Error display : [Directive remote controller thermistor.] Indoor unit Outdoor unit Red LED Stays OFF Red LED Stays OFF Green LED Keeps flashing Green LED Keeps flashing Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only. Are characteristics of Detectivie remote controller PCB Is the remote controller...
  • Page 23 (4) Error diagnosis procedures at the outdoor units side At the error diagnosis related to the outdoor unit, check at first the error code of remote controller and the illumination patterns of norma1 and inspection display lamps in the same manner as the case of indoor unit. Then estimate the outline, the cause and the location of error based on the pattern and proceed to the inspcetion and repair.
  • Page 24 Parts layout on the outdoor unit PCB FDCVA151~251 type Sub PCB (Noise filter) Reactor Fan motor Stepping motor CNV1 CNI2 CNI3 Outdoor air temp. thermistor, Outdoor heat exchanger themistor, Discharge pipe thermistor (Tho-A, Tho-R, Tho-D) DIP switch DIP switch Power transistor thermistor (SW6) (SW7) (Tho-IPM)
  • Page 25 FDCA301~601 type Stepping motor PCB power supply connector (Secondary side) Outdoor air thermistor, Outdoor heat exchanger thermistor, CNA2 Discharge pipe thermistor Outdoor unit power supplly (Tho-A, Tho-D, Tho-R1, 2) IC12 PCB power supply connector (Primary side) High pressure switch 1 2 3 4 LED-R (63H1) LED-G...
  • Page 27 Error display [Communications error during operation] Indoor unit Outdoor unit 2 time flash Red LED 2 time flash Red LED Keeps flashing Green LED Keeps flashing Green LED Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only. Is the connection Did the remote Is the connection...
  • Page 28 Error display [Inverter primary current abnormal] [Only case of 151~251 type] Indoor unit Outdoor unit 1 time flash Red LED Stays OFF Red LED Green LED Keeps flashing ● Display Conditions Restore it to the Is the power supply normal? normal state.
  • Page 29 [Open phase at L3 phase of 52C secondary side] (Only case of 301~601 type) Error display : Indoor unit Outdoor unit 1 time flash Red LED Stays OFF Red LED Keeps flashing Green LED Keeps flashing Green LED Notes (1) Also check if there is voltage at the L3 phase on the 52C primary side, but no voltage on the secondary side (coil wire disconnec- secondary side L3 phase Repair...
  • Page 30 Error display : [Discharge temperature error] Indoor unit Outdoor unit 1 time flash Red LED Stays OFF Red LED Keeps flashing Green LED Keeps flashing Green LED Check the unit side. Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only. During cooling: Is FM operating? During heating: Is FM...
  • Page 31 Error display : [Defective outdoor air temperature thermistor] Indoor unit Outdoor unit 1 time flash Red LED Stays OFF Red LED Keeps flashing Green LED Keeps flashing Green LED Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only. Is the outdoor Is the outdoor Defective outdoor unit control PCB...
  • Page 32 Error display : [63H1 operation] (Only case of 301~601 type) Indoor unit Outdoor unit 1 time flash Red LED Stays OFF Red LED Keeps flashing Green LED Keeps flashing Green LED While the 63H1 is operating 1. During Cooling • Is the outdoor unit fan motor running? •...
  • Page 33 Error display [Inverter over-voltage trouble] (Only case of 151~251 type) Indoor unit Outdoor unit 1 time flash Red LED Stays OFF Red LED Green LED Keeps flashing Is there foreign matter Remove the foreign matter such as dust or dirt on the soldered such as dust and dirt.
  • Page 34 Error display : [Power transistor thermistor faulty.] (Only case of 151~251 type) Indoor unit Outdoor unit 1 time flash Red LED Stays OFF Red LED Green LED Keeps flashing Are the Defective outdoor unit control Is the power transistor Replacement (Defective power transistor thermistor thermistor characteristics power transistor thermistor input...
  • Page 35 Error display : [Abnormalities in compressor starting] (Only case of 151~251 type) Indoor unit Outdoor unit 1 time, 2 time, 3 time flash Red LED Stays OFF Red LED Green LED Keeps flashing Check of Check Inverter power transistor Is the power Is the balance the compressor’s Replacement...
  • Page 36 Power transistor module (including drive circuit) check method Is the power transistor module cracked or burnt? Is there a short circuit between the power transistor module ❇ terminals? Compressor operation Is the balance between the compressor current phases good? If there is a 10% or greater difference in the current in different phases.
  • Page 37 (4) Check abnormal operation data with the remote controller Operation data are recorded when there is an abnormal state and these data can be displayed in the remote controller by operating the remote controller buttons. (1) Press the CHECK button. FUNCTION”...
  • Page 38: Outline Of Operation Control By Microcomputer

    OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Remote controller (a) Wired remote controller The figure below shows the remote controller 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 39 (2) Setting functions using the remote controller (a) The factory settings of this unit's functions are as follows: If you want to charge a setting, follow the procedure found in the installation manual and set to your desired setting. For the method of setting, please refer to the installation manual of a remote control unit. 1 Remote controller unit functions ( FUNCTION 2 Indoor unit functions (I/U FUNCTION...
  • Page 40 (b) Function setting method Operating guide message 1) Stop the air conditioner Function description: B , Settting: C Function number: A 2) Press the SET and MODE buttons simultaneously for 3 seconds or longer. The screen display will be switched as follows: Confirm Button “...
  • Page 41 When “I/U FUNCTION ” is selected. 1 The screen display will be switched as follows: “ I/U SELECT” “ SET” “I/U No.00” (blinking) I/U No.00 2 Press either button. Select the indoor unit number that you want to change settings. If only one indoor unit is connected, the indoor unit number will not charge, so please proceed to Step 3.
  • Page 42 Changing the remote controller’s temperature setting range 1) The temperature setting range of the remote controller can be changed. Through remote controller button operations, the upper limit and lower limit set temperature values can be changed individually. During heating operation, the changed upper limit value becomes valid and at times other than during heating operation, (during cooling, dehumidification, auto and fan operation), the changed lower limit value becomes valid.
  • Page 43 (3) Cooling Test Operation Procedure Carry out the following test operation procedure using the remote controller. (a) Starting the Cooling Test Operation 1 Press the ON/OFF button to start operation. 2 Press the MODE button and select “COOL.” 3 Press the TEST button continuously for 3 seconds or longer. The display changes from “...
  • Page 44 (5) Test run (a) Test run method 1) A test run can be initiated from an outdoor unit by using SW9 (SW2) and SW5-4 for on-site setting. 2) Models FDCVA151~251 When SW9 (press button switch) is pressed for 1 second and then released, the compressor will start operation approxi- mately 5 seconds later.
  • Page 45: Error Code

    3. Check display on wireless specification models (FDTN · FDEN · FDKN) (1) Indication board (a) FDEN Series Romote controller signal receiving part Backup switch TIMER CHECK Operation display light (Green) • Lights continously: Under air conditioner operaton • Keeps flashing: Under heating preparation (At the time of heating operation) •...
  • Page 46 Wireless remote controller Signal sender OPERATION MODE indicator Signals are sent to the air conditioner Indicates selected operation mode from here. Filter reset indicator Fan speed mark is indicated when the FILTER Indicates the selected fan speed FILTER RESET button is pressed. Auto swing Temperature indicator Indicates the selection of swing louver.
  • Page 48 NOTICE The installation of this equipment must comply with all NATIONAL, STATE and LOCAL CODES. This Service Guide does not cover all installation circumstances and is meant for guidance only and therefore will not form part of any legally binding contract. An installation guide is provided with the air conditioning equipment.

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