Mitsubishi Heavy Industries FDT71VNXVD Service Manual
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Mitsubishi Heavy Industries FDT71VNXVD Service Manual

Hyper inverter packaged air-conditioners
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Service Manual

DATA BOOK
HYPER INVERTER PACKAGED AIR-CONDITIONERS
(Split system, Air to air heat pump type)
Ceiling Cassette - 4 way type
CEILING CASSETTE- 4 WAY COMPACT TYPE
Twin type
Triple type
>FDT71VNXVD
FDTC71VNXPVD
>FDT125VNXVD
FDTC100VNXPVD
FDTC100VSXPVD
>FDT140VNXVD
FDTC125VNXPVD
FDTC125VSXPVD
Ceiling Suspended type
>FDEN71VNXVD
>FDEN125VNXVD
CEILING CASSETTE- 4 WAY TYPE
>FDEN140VNXVD
Single type
Twin type
FDT71VNXVD
Ducted - Medium to High Static type
FDT100VNXVD
FDT100VSXVD
FDT125VNXVD
>FDU71VNXVD
FDT125VSXVD
>FDU125VNXVD
FDT140VNXVD
>FDU140VNXVD
FDT140VSXVD
CEILING SUSPENDED TYPE
Single type
Twin type
FDEN71VNXVD
FDEN100VNXVD
FDEN100VSXVD
FDEN125VNXVD
FDEN125VSXVD
FDEN140VNXVD
FDEN140VSXVD
FDTC140VNXTVD
FDTC140VSXTVD
Triple type
FDT71VNXPVD
FDT140VNXTVD
FDT100VNXPVD
140VSXTVD
FDT100VSXPVD
FDT125VNXPVD
FDT125VSXPVD
FDT140VNXPVD
FDT140VSXPVD
Triple type
FDEN71VNXPVD
FDEN140VNXTVD
FDEN100VNXPVD
140VSXTVD
FDEN100VSXPVD
FDEN125VNXPVD
FDEN125VSXPVD
FDEN140VNXPVD
FDEN140VSXPVD
Manual No. '10
DUCT CONNECTED-LOW/MIDDLE STATIC PRESSURE TYPE
Single type
Twin type
FDUM71VNXVD
FDUM100VNXPVD
FDUM100VNXVD
FDUM100VSXPVD
FDUM100VSXVD
FDUM125VNXPVD
FDUM125VNXVD
FDUM125VSXPVD
FDUM125VSXVD
FDUM140VNXPVD
FDUM140VNXVD
FDUM140VSXPVD
FDUM140VSXVD
DUCT CONNECTED-HIGH STATIC PRESSURE TYPE
Single type
FDU71VNXVD
FDU100VNXVD
FDU100VSXVD
FDU125VNXVD
FDU125VSXVD
FDU140VNXVD
FDU140VSXVD
WALL MOUNTED TYPE
Twin type
Triple type
SRK100VNXPZIX
SRK140VNXTZIX
SRK100VSXPZIX
SRK140VSXTZIX
SRK125VNXPZIX
SRK125VSXPZIX
PAC - DB - 13A
•
DRAFT
Triple type
FDUM140VNXTVD
FDUM140VSXTVD

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Summary of Contents for Mitsubishi Heavy Industries FDT71VNXVD

  • Page 1: Service Manual

    (Split system, Air to air heat pump type) Ceiling Cassette - 4 way type CEILING CASSETTE- 4 WAY COMPACT TYPE DUCT CONNECTED-LOW/MIDDLE STATIC PRESSURE TYPE Twin type Triple type Single type Twin type Triple type >FDT71VNXVD FDTC71VNXPVD FDTC140VNXTVD FDUM71VNXVD FDUM100VNXPVD FDUM140VNXTVD >FDT125VNXVD FDTC100VNXPVD FDTC140VSXTVD...

  • Page 2: Outline Of Operation Control By Microcomputer

    '10 • PAC-SM-137A 1. OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1.1 Remote controller 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 3: Operation Section

    '10 • PAC-SM-137A (2) Wireless remote controller FDEN series only 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 4: Operation Control Function By The Wired Remote Controller

    '10 • PAC-SM-137A 1.2 Operation control function by the wired remote controller Switching sequence of the operation mode switches of remote controller [CPU reset] This functions when “CHECK” and “GRILL” buttons on the remote controller are pressed simultaneously. Operation is same as that of the power supply reset.

  • Page 5: Operation Control Function By The Indoor Controller

    '10 • PAC-SM-137A 1.3 Operation control function by the indoor controller (1) FDT, FDEN, FDU series Auto operation If “Auto” mode is selected by the remote controller, the heating and the cooling are automatically switched according to the difference between outdoor air temperature and setting temperature and the difference between setting temperature and return air temperature.
  • Page 6 '10 • PAC-SM-137A Timer operation Sleep timer Set the duration of time from the present to the time to turn off the air-conditioner. It can be selected from 10 steps in the range from “OFF 1 hour later” to “OFF 10 hours later”. After the sleep timer setting, the remaining time is displayed with progress of time in the unit of hour.
  • Page 7 '10 • PAC-SM-137A Hot keep Hot keep control is performed at the start of the defrost control. Control When the indoor heat exchanger temperature (detected with Th -R1 or R2) drops to 35°C or lower, the speed of indoor fan is changed to the lower tap at each setting. During the hot keep, the louver horizontal control signal is transmitted.
  • Page 8 '10 • PAC-SM-137A Automatic louver level setting during heating At the hot start with the heating thermostat OFF, regardless whether the auto swing switch is operated or not (auto swing or louver stop), the louver takes the level position (In order to prevent the cold start). The louver position display LCD continues to show the display which has been shown before entering this control.
  • Page 9 '10 • PAC-SM-137A Operation check mode There is no communication with the outdoor unit but it allows performing operation in respective modes by operating the remote controller. Drain pump test run mode As the drain pump test run is established, the drain pump only operates and during the operation protective functions by the microcomputer of indoor unit become ineffective.
  • Page 10 '10 • PAC-SM-137A Anomalous fan motor [In case of FDT only] After starting the fan motor, if the fan motor speed is 200rpm or less is detected for 30 seconds continuously and 4 times within 60 minutes, then fan motor stops with the anomalous stop (E16). Plural unit control –...
  • Page 11 '10 • PAC-SM-137A Abnormal temperature thermistor (return air/indoor heat exchanger) wire/short-circuit detection Broken wire detection When the return air temperature thermistor detects -50°C or lower or the heat exchanger temperature thermistor detect -50°C or lower for 5 seconds continuously, the compressor stops. After a 3-minute delay, the compressor restarts but, if it is detected again within 60 minutes after the initial detection for 6 minutes continuously, stops again (the return air temperature thermistor: E7, the heat exchanger temperature thermistor: E6).
  • Page 12 '10 • PAC-SM-137A External input/output control (CnT) Be sure to connect the wired remote controller to the indoor unit. Without wired remote controller remote operation by CnT is not possible to perform. Optional ① Operation output (CnT-2: XR1) ② Heating output (CnT-3: XR2) ③...
  • Page 13 '10 • PAC-SM-137A Remote operation In case of multiple units (Max. 16 indoor units group) are connected to one wired remote controller When the indoor function setting of wired remote controller for “External control set” is changed from “Individual (Factory default)” to “ For all units”, all units connected in one wired remote controller system can be controlled by external operation input.
  • Page 14 '10 • PAC-SM-137A Room temperature detection temperature compensation during heating With the standard specification, the compressor is turned ON/OFF with the thermostat setting temperature. When the thermostat is likely to turn OFF earlier because the unit is installed at the ceiling where warm air tends to accumulate, the setting can be changed with the wired remote controller indoor unit function “...

  • Page 15: Operation Control Function By The Outdoor Controller

    '10 • PAC-SM-137A 1.4 Operation control function by the outdoor controller Determination of compressor speed (frequency) Required frequency Cooling/dehumidifying operation Unit: rps Model Indoor unit air flow “P-Hi”, “Hi” Max. required frequency Indoor unit air flow “Me”, “Lo” Min. required frequency (b) Heating operation Unit: rps Model...
  • Page 16 '10 • PAC-SM-137A Compressor soft start control (a) Compressor protection start I [Control condition] Normally, the compressor operation frequency is raised in this start pattern. [Control contents] 1) Starts with the compressor’s target frequency at A rps. However, when the ambient air temperature (Tho-A) is 35°C or higher during cooling/ dehumidifying or the indoor return air temperature (Th -A) is 25°C or higher during heating, it starts at C rps.
  • Page 17 '10 • PAC-SM-137A Outdoor unit fan control (a) Outdoor unit fan tap and fan motor speed Unit: min Model Mode Fan motor tap speed speed speed speed speed speed speed Cooling/Dehumidifying Heating speed speed speed speed speed speed speed Cooling/Dehumidifying Heating speed speed...
  • Page 18 '10 • PAC-SM-137A The outdoor unit heat exchanger temperature is detected always and, when the number of revolutions of the outdoor fan speed has been increased or decreased, there is no change of fan speed for 20 seconds. Rage of the outdoor unit fan speed under this control is as follows. Lower limit: 130rpm Upper limit: 500rpm As any of the following conditions is established, this control terminates.
  • Page 19 '10 • PAC-SM-137 Defrosting Model 71 ~ 140 (a) Defrosting start conditions If all of the following defrosting conditions A or conditions B are met, the defrosting operation starts. Defrosting conditions A Cumulative compressor operation time after the end of defrosting has elapsed 37 [45] minutes, and the cumulative compressor operation time Defrost operation start after the start of heating operation (remote...
  • Page 20 '10 • PAC-SM-137A (c) Switching of defrosting control with SW3-1 If SW3-1 on the outdoor unit control PCB is turned to ON, it becomes easier to enter the defrosting operation. Use this when installing a unit at snowing regions. Control contents It allows entering the defrosting operation under the defrosting condition A when the cumulative heating operation time becomes 30 minutes.
  • Page 21 '10 • PAC-SM-137A (c) Heating high pressure protection Protective control As the indoor unit heat exchanger temperature (Th -R) exceeds the setting value, the compressor speed (frequency) is controlled to suppress the rise of high pressure. Control value A is updated to an optimum value automatically according to the operating conditions. Existing piping adaptation switch: SW5-1 (SW8-1: model 80) Reduces compressor frequency Model...
  • Page 22 '10 • PAC-SM-137A (g) Over-current protection current safe controls I, II Detecting the outdoor unit inverter input (primary) current and the output (secondary) current, if the current values exceed setting values, the compressor speed (frequency) is controlled to protect the inverter. Reduces frequency Cooling Heating...
  • Page 23 '10 • PAC-SM-137A Dewing prevention control [Control condition] During cooling and dehumidifying operation, if all the following conditions are established, the compressor speed (frequency) is reduced to prevent dewing and water splash. Cooling electronic expansion valve aperture (EEVC) is 500 pulses. Suction overheat is 10°C or higher.
  • Page 24 '10 • PAC-SM-137A Silent mode As “Silent mode start” signal is received from the remote controller, it operates by dropping the outdoor unit fan tap and the compressor speed (frequency). (b) For details, refer to items (1) and (4) above. Test run (a) It is possible to operate from the outdoor unit using the dip switch on the outdoor unit control PCB.
  • Page 25 '10 • PAC-SM-137A Drain pan ON/OFF output control (optional) (Models 125 ∼ 140 only) Drain pan heater ON conditions When all of following conditions are met, the drain pan heater is turned ON. ・ Outdoor air temperature (detected with Tho-A) is 3ºC or lower. ・...
  • Page 26 '10 • PAC-SM-137A 2. MAINTENANCE DATA 2.1 Diagnosing of microcomputer circuit Selfdiagnosis function (a) Check Indicator Table Whether a failure exists or not on the indoor unit and outdoor unit can be know by the contents of remote controller error code, indoor/outdoor unit green LED (power pilot lamp and microcomputer normality pilot lamp) or red LED (check pilot lamp).
  • Page 27 '10 • PAC-SM-137A (ii) Outdoor unit Remote controller Indoor control PCB Outdoor control PCB Outdoor inventer PCB Reference Location of trouble Description of trouble Repair method Green Green Yellow page Error code Red LED Red LED Red LED LED (1) LED (1) •...
  • Page 28 '10 • PAC-SM-137A (iv) Display sequence of error codes or inspection indicator lamps Occurrence of one kind of error Displays are shown respectively according to errors. Occurrence of plural kinds of error Section Category of display Error code on remote •...
  • Page 29 '10 • PAC-SM-137A Error log and reset Error indicator Memorized error log Reset Remote controller display • Higher priority error is memorized. • Stop the unit by pressing the ON/OFF switch of remote controller. Red LED on indoor control PCB •...
  • Page 30 '10 • PAC-SM-137A Model: FDT series PSB012D931F • Control PCB Replace and set up the PCB according to this instruction. Set to an appropriate address and function using switch on PCB. Select the same setting with the removed PCB. item switch Content of control Address...
  • Page 31 '10 • PAC-SM-137A • Power PCB PSB012D953A This PCB is a general PCB. Replace the PCB according to this instruction. Replace the PCB (refer to right dwg.) 1. Unscrew terminal of the wiring(yellow/green) soldered to PCB from the box. 2. Cut the band that binds the wiring (red and blue) from connector CNW1 and CNW2, and the wiring (yellow/green) from PCB (T2/T3) . (Note 1) (However, do not cut the band that binds only the red and blue wirings.) 3.
  • Page 32 '10 • PAC-SM-137A Model: FDU, FDEN series PSB012D933D Set to an appropriate address and function using switch on PCB. There is a unit having plural applicable PCB depending on a model. Set the function setting corresponding the spare PCB and the applicable model. item switch Content of control...
  • Page 33 '10 • PAC-SM-137A DIP switch setting list Switches Description Default setting Remarks Address No. setting at plural indoor units control by 1 R/C SW5-1 Master * /Slave Master/Slave setting See table 2 SW5-2 SW6-1 SW6-2 Model selection As per model See table 1 SW6-3 SW6-4...
  • Page 34 '10 • PAC-SM-137A Troubleshooting at the outdoor unit When troubleshooting the outdoor unit, firstly assess the overview of malfunction and try to presume the cause and the faulty part by checking the error cord dispalyed on the remote controller and flashing pattern of indicator lamps (Red LED and Green LED), and then proceed further inspection and remedy it.
  • Page 35 '10 • PAC-SM-137A 1) Model FDC71VNX PCA012D021C a) Replace the PCB after elap ing 3 minute from power OFF. (Be ure to mea ure voltage (DC) between T26 and T27 on inverter PCB, and check that the voltage i di charged ufficiently(10V or le ).(Refer to Fig.1)) b) Disconnect the connectors from the control PCB.
  • Page 36 '10 • PAC-SM-137A Model FDC 125VNX, 140VNX PCA012D024F Model Replace the PCB after elapsing 3 minutes from power OFF. Measurement was done on both ends of connector(CNA1) during measurement, the voltage(DC) might charged the electrolytic capacitor, be sure that the voltage is discharged sufficiently. (Refer to Fig.1) Disconnect the connectors from the control PCB.
  • Page 37 '10 • PAC-SM-137A (c) Outdoor inverter PCB replacement procedure Precaution 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 38 '10 • PAC-SM-137A DIP witch etting li t (Outdoor unit) (1) Control PCB Model FDC71VNX Switches Description Default setting Remarks SW3-1 Defrost condition Normal*/Cold region Normal SW3-2 Snow protection control Normal*/Snow protection Normal SW3-3 Model selection Cooling only/Heat pump* Heat pump Keep OFF Defrost prohibition time ON: 37min*/OFF: 45min...
  • Page 39 '10 • PAC-SM-137A Check of anomalous operation data with the remote Number Data Item controller (Operation Mode) Operation data can be checked with remote control unit operation. (Set Temperature) Press the button. (Return Air Temperature) The display change “ ” (Remote Controller Thermistor Tempeature) Press the (SET) button while “...

  • Page 40: Check Run

    '10 • PAC-SM-137A Inspection display of wireless specification model (FDEN, FDT) Display FDEN Series Romote controller signal receiving part Backup switch TIMER CHECK Operation display light (Green) • Lights continuously: Under air conditioner operation • Keeps flashing: Under heating preparation (At the time of heating operation) •...
  • Page 41 '10 • PAC-SM-137A Power transistor module (including the driver PCB) inspection procedure Is the power transistor module cracked or burnt? Is there a short circuit between the power transistor module terminals? 1 Compressor operation Is there any difference in the compressor current If there is a 10% or greater difference between phases? in the current in different phases.
  • Page 42 '10 • PAC-SM-137A (8) Inverter checker for diagnosis of inverter output Checking method (a) Setup procedure of checker. 1) Power OFF (Turn off the breaker). 2) Remove the terminal cover of compressor and disconnect the wires (U, V, W) from compressor. 3) Connect the wires U (Red) , V (White) and W (Black) of checker to the terminal of disconnected wires (U, V, W) from compressor respectively.
  • Page 43 '10 • PAC-SM-137A (9) Outdoor unit controller failure diagnosis circuit diagram...
  • Page 44 '10 • PAC-SM-137$...
  • Page 45 '10 • PAC-SM-137A Troubleshooting Green Content Error code Indoor Keeps flashing Stays OFF Remote controller: None Operates but does not cool Outdoor Keeps flashing Stays OFF 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor unit fan operation. Check the temperature differnce between return and supply air.
  • Page 46 '10 • PAC-SM-137$ Green Error code Content Indoor Keeps flashing Stays OFF Remote controller: None Operates but does not heat Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Check the indoor unit fan operation. Check the temperature differnce between return and supply air.
  • Page 47 '10 • PAC-SM-137$ Green Error code Content Indoor Stays OFF Stays OFF Remote controller: None Earth leakage breaker activated Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are OK the insulation resistance and Replace compressor. coil resistance of compressor? 2.
  • Page 48 '10 • PAC-SM-137$ Green Error code Content – – Indoor Remote controller: None Excessive noise/vibration (1/3) – – Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure If excessive noise/vibration persists when sufficient Does time has elapsed after noise/vibration occur during or soon stopping the unit, it is after stopping operation...
  • Page 49 '10 • PAC-SM-137$ Green Error code Content – – Indoor Remote controller: None Excessive noise/vibration (2/3) – – 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 the casing.
  • Page 50 '10 • PAC-SM-137$ Green Error code Content – – Indoor Remote controller: None Excessive noise/vibration (3/3) – – 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/ cooling/heating operation is in...
  • Page 51 '10 • PAC-SM-137$ Green Error code Content Louver motor failure Keeps flashing Stays OFF Indoor Remote controller: None (FDT and FDEN series) Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model FDT, FDTC and FDEN series Diagnosis Countermeasure only Check at the indoor unit side.
  • Page 52 '10 • PAC-SM-137$ Green Error code Content Power supply system error Indoor Stays OFF Stays OFF Remote controller: None (Power supply to indoor control PCB) Outdoor Stays OFF 2 times flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure AC220/240V detected between 1 and 2 on the terminal block...
  • Page 53 '10 • PAC-SM-137$ Green Error code Content Power supply system error Keeps flashing Stays OFF Indoor Remote controller: None (Power supply to remote controller) Keeps flashing 2 times flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Isn't there any Correct.
  • Page 54 '10 • PAC-SM-137$ Green Error code Content INSPECT I/U Keeps flashing Stays OFF Indoor Remote controller: INSPECT I/U (When 1 or 2 remote controllers are connected) Keeps flashing 2 times flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are 2 units of remote controller...
  • Page 55 '10 • PAC-SM-137$ Green Error code Content INSPECT I/U Keeps flashing Stays OFF Indoor Remote controller: INSPECT I/U (Connection of 3 units or more remote controller) Keeps flashing 2 times flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are more than 3 units of remote controller...
  • Page 56 '10 • PAC-SM-137$ Green Error code Content Communication error at Indoor Keeps flashing Stays OFF WAIT Remote controller: initial operation (1/3) Outdoor Keeps flashing 2 times flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure WAIT “ ” is still displayed on the remote controller LED 2 minutes after power ON.
  • Page 57 '10 • PAC-SM-137$ Green Error code Content Communication error at Indoor Keeps flashing Stays OFF WAIT Remote controller: initial operation (2/3) Outdoor Keeps flashing 2 times flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Diagnosis for when the outdoor control PCB LED is turned off Shut down the breaker and back on again the breaker 3 minutes later.
  • Page 58 '10 • PAC-SM-137$ Green Error code Content Communication error at Indoor Keeps flashing Stays OFF WAIT Remote controller: initial operation (3/3) Outdoor Keeps flashing 2 times flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Method to check for inverter PCB before replacement of blown power supply fuse.
  • Page 59 '10 • PAC-SM-137$ Green Error code Content Indoor Keeps flashing Stays OFF Remote controller: None No display Outdoor Keeps flashing 2 times flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Remote controller does not display anything after the power on. Is DC10V or Defective remote controller higher detected at remote controller connection...
  • Page 60 '10 • PAC-SM-137$ Green Error code Content Remote controller Keeps flashing Stays OFF Indoor Remote controller: communication circuit error Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Malfunction by noise Is it possible to Check peripheral reset normally by the power reset?
  • Page 61 '10 • PAC-SM-137$ Green Error code Content Indoor Keeps flashing 2 times flash Remote controller: Communication error during operation Keeps flashing See below Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure In case that the outdoor unit red LED flashes 2-times Note (1) Inspect faulty connections (disconnection, looseness) on the outdoor unit terminal block.
  • Page 62 '10 • PAC-SM-137$ Green Error code Content Indoor heat exchanger Indoor Keeps flashing 1 time flash Remote controller: temperature thermistor anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the connection of indoor heat Correct.
  • Page 63 '10 • PAC-SM-137$ Green Error code Content Return air temperature Indoor Keeps flashing 1 time flash Remote controller: thermistor anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the connection of return Correct. Connect air temperature thermistor connector.
  • Page 64 '10 • PAC-SM-137$ Green Error code Content Indoor Keeps flashing 1 time flash Remote controller: Heating overload operation Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the air filter clogged? Wash. 2. Error detection method Is the Defective indoor heat indoor heat exchanger...
  • Page 65 '10 • PAC-SM-137$ Green Error code Content Drain trouble Indoor Keeps flashing 1 time flash Remote controller: (FDT, FDU series) Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model FDT, FD8 Diagnosis Countermeasure series only Check the error data in the remote controller. Is there any overflow? Is DC 12V at CNI connector.
  • Page 66 '10 • PAC-SM-137$ Green Excessive number of connected Error code Content indoor units (more than 17 units) Indoor Keeps flashing Stays OFF Remote controller: by controlling with one remoto controller Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...

  • Page 67: Communication Error

    '10 • PAC-SM-137$ Green Error code Content Communication error Indoor Keeps flashing 3 times flash Remote controller: between master and slave indoor units Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is it OK the unit address setting for master Correct unit address setting.
  • Page 68 '10 • PAC-SM-137$ Green Error code Content Indoor fan motor anomaly Indoor Keeps flashing (-) Stays OFF (-) Remote controller: (In case of FDT series) Keeps flashing Stays OFF Outdoor Note (1) Value in ( ) are for the model SRK. 5.
  • Page 69 '10 • PAC-SM-137$ Green Error code Content Indoor unit operation check, Indoor Keeps flashing 1 time flash Remote controller: drain motor check setting error Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure E19 occurs when the power ON Defective indoor control Is SW7-1...
  • Page 70 '10 • PAC-SM-137$ Green Error code Content Remote controller Indoor Keeps flashing Stays OFF Remote controller: temperature thermistor anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure 2. Error detection method Is the remote Correct.
  • Page 71 '10 • PAC-SM-137A Green Error code Content Open L3 phase on power supply Indoor Keeps flashing Stays OFF Remote controller: (3-phase model only) Outdoor Keeps flashing 1 time flash 5. Troubleshooting 1. Applicable model 3-phase model only Diagnosis Countermeasure Measure the power supply voltage.
  • Page 72 '10 • PAC-SM-137A Green Error code Content Indoor Keeps flashing Stays OFF Remote controller: Cooling overload operation Outdoor Keeps flashing 1 time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure * For the characteristics of outdoor heat exchanger temperature Are the thermistor, refer to E37.
  • Page 73 '10 • PAC-SM-137A Green Error code Content Indoor Keeps flashing Stays OFF Remote controller: Discharge pipe temperature error Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure * For the characteristics of discharge Are the pipe temperature, refer to E39.
  • Page 74 '10 • PAC-SM-137A Green Error code Content Outdoor heat exchanger Indoor Keeps flashing Stays OFF Remote controller: temperature themistor anomaly Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the outdoor heat exchanger temperature Correct connector.
  • Page 75 '10 • PAC-SM-137A Green Error code Content Outdoor air temperature Indoor Keeps flashing Stays OFF Remote controller: thermistor anomaly Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure the outdoor air Correct connector. temperature thermistor connector connected properly? For the characteristics of outdoor air temperature thermistor, see the following graph.

  • Page 76: Discharge Pipe

    '10 • PAC-SM-137A Green Error code Content Discharge pipe Keeps flashing Stays OFF Indoor Remote controller: temperature thermistor anomaly Keeps flashing 1 time flash Outdoor 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the discharge pipe temperature thermistor Correct connector.
  • Page 77 '10 • PAC-SM-137A Green Error code Content High pressure error (63H1 activated) Indoor Keeps flashing Stays OFF Remote controller: Outdoor Keeps flashing 1 time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure If the power supply breaker is turned OFF and ON too quickly, E40 may be displayed.
  • Page 78 '10 • PAC-SM-137A Green Content Error code Indoor control PCB Keeps flashing Stays OFF Remote controller: Power transistor overheat Keeps flashing 1 time flash Outdoor control PCB Outdoor Yellow LED (Single phase model only)    inverter 6 times flash or 2 times flash 5.
  • Page 79 '10 • PAC-SM-137A Green Content Error code Indoor control PCB Keeps flashing Stays OFF Remote controller: Keeps flashing 1 time flash Outdoor control PCB Current cut (1/2) Outdoor Yellow LED inverter Stays off or 4 times flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...
  • Page 80 '10 • PAC-SM-137A Green Content Error code Indoor Keeps flashing Stays OFF Remote controller: Keeps flashing 1 time flash Outdoor control PCB Current cut (2/2) Outdoor Yellow LED inverter 1 time flash or 5 times flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...
  • Page 81 '10 • PAC-SM-137A Green Error code Content Inverter communication error Indoor Keeps flashing Stays OFF Remote controller: Outdoor Keeps flashing 1 time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the connector connection between the outdoor Correct connector. control PCB and the inverter PCB OK? 2.
  • Page 82 '10 • PAC-SM-137A Green Error code Content Indoor Keeps flashing Stays off Remote controller: Inverter PCB A/F module anomaly Keeps flashing 1 time flash Outdoor control PCB Outdoor (Model FDC71VNX) Yellow LED Inverter 7 times flashing 5. Troubleshooting 1. Applicable model Model FDC71 Diagnosis Countermeasure...
  • Page 83 '10 • PAC-SM-137A Green Error code Content Outdoor fan motor anomaly Indoor Keeps flashing Stays OFF Remote controller: Outdoor Keeps flashing 1 time flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Does any foreign Remove foreign material. material intervene in rotational area of fan propeller? Does the 2.
  • Page 84 '10 • PAC-SM-137A Green Error code Content Low pressure error or Indoor Keeps flashing Stays OFF Remote controller: low pressure sensor anomaly (1/2) Outdoor 1 time flash Keeps flashing 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the low Correct.
  • Page 85 '10 • PAC-SM-137A Green Error code Content Low pressure error or Indoor Keeps flashing Stays OFF Remote controller: low pressure sensor anomaly (2/2) Outdoor 1 time flash Keeps flashing 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Continued from previous page. 2.
  • Page 86 '10 • PAC-SM-137 '10 • PAC-SM-137A Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote controller: Inverter and fan motor anomaly Outdoor control PCB Keeps flashing 1 time flash Outdoor Yellow LED inverter 2 times flash or 6 times flash 5.
  • Page 87 '10 • PAC-SM-137A Green Error code Content Suction pipe temperature Indoor Keeps flashing Stays OFF Remote controller: thermistor anomaly Outdoor 1 time flash Keeps flashing 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure 2. Error detection method Is the connection Correct connection of of suction pipe temperature thermistor suction pipe temperature...
  • Page 88 '10 • PAC-SM-137 '10 • PAC-SM-137A Green Error code Content Low pressure sensor anomaly Indoor Keeps flashing Stays OFF Remote controller: Outdoor 1 time flash Keeps flashing 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Are the connection of low pressure Correct low pressure sensor sensor connectors (at sensor side connector connection.
  • Page 89 '10 • PAC-SM-137A Green Error code Content Insufficient refrigerant amount Indoor Keeps flashing Stays OFF Remote controller: or detection of service valve closure Outdoor 1 time flash Keeps flashing 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure Is the Open fully.
  • Page 90 '10 • PAC-SM-137A Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote controller: Compressor startup failure Outdoor control PCB Keeps flashing 1 time flash Outdoor Yellow LED inverter Stays off or 4 times flash 5. Troubleshooting 1. Applicable model All models Diagnosis Countermeasure...

  • Page 91: Piping System

    '10 • PAC-SM-137A 4. PIPING SYSTEM (1) Single type Model 71 Indoor unit Outdoor unit Cooling cycle Heating cycle Check joint Thermistor (ThO-A) Gas line Muffler ( 15.88) 4way valve Service valve Flare connecting (Flare connecting) Check joint Thermistor Thermistor (Heat exchanger) Heat exchanger High pressure...

  • Page 92: Installation Of Wired Remote Controller

    '10 • PAC-SM-137A PJA012D729A 5.2 Installation of wired remote controller Read together with indoor unit's installation manual. WARNING Fasten the wiring to the terminal securely and hold the cable securely so as not to apply unexpected stress on the terminal. Loose connection or hold will cause abnormal heat generation or fire.
  • Page 93 '10 • PAC-SM-137A Connect the remote controller cord to the Sheath Sheath Upper Upper terminal block. Upper case Connect the terminal of remote controller (X,Y) Upper case Board Board with the terminal of indoor unit (X,Y). (X and Y are no polarity) Wiring route is as shown in the right diagram depending on the pulling out direction.
  • Page 94 '10 • PAC-SM-137A The range of temperature setting When shipped, the range of set temperature differs depending on the operation mode as below. Heating : 16 ~ 30˚C (55 ~ 86˚F) Except heating (cooling, fan, dry, automatic) : 18 ~ 30˚C (62 ~ 86˚F) Upper limit and lower limit of set temperature can be changed with remote controller.
  • Page 95 '10 • PAC-SM-137A The functional setting The initial function setting for typical using is performed automatically by the indoor unit connected, when remote controller and indoor unit are connected. As long as they are used in a typical manner, there wiil be no need to change the initial settings. If you would like to change the initial setting marked “...
  • Page 96 '10 • PAC-SM-137A Note 1: The initial setting marked “ ” is decided by connected indoor and outdoor unit, and is automatically defined as following table. Function No. Item Default Model "Auto-RUN" mode selectable indoor unit. Remote controller function02 Indoor unit without "Auto-RUN" mode Indoor unit with two or three step of air flow setting Remote controller function06...
  • Page 97 '10 • PAC-SM-137A Operation message How to set function Function description: Function No. Stop air-conditioner and press (SET) (MODE) setting description: buttons at the same time for over three seconds, and the "FUNCTION SET " will be displayed. Fixing button Press (SET) button.
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  • Page 119 16-5, 2-chome, Kounan, Minato-ku, Tokyo, 108-8215, Japan Fax : (03) 6716-5926 Because of our policy of continuous improvement, we reserve the right to make changes in all specifications without notice. © Copyright MITSUBISHI HEAVY INDUSTRIES, LTD. © Copyright MITSUBISHI HEAVY INDUSTRIES, LTD.

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