Mitsubishi Heavy Industries FDT71VNXWVH Service Manual
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Mitsubishi Heavy Industries FDT71VNXWVH Service Manual

Hyper inverter packaged air-conditioners (split system, air to air heat pump type)
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SERVICE MANUAL
HYPER INVERTER PACKAGED
AIR-CONDITIONERS
(Split system, air to air heat pump type)
CEILINING CASSETTE-4 WAY TYPE
Single type
FDT71VNXWVH
Twin type
FDT71VNXWPVH
DUCT CONNECTED-HIGH STATIC
PRESSURE TYPE
Single type
FDU71VNXWVH
CEILING SUSPENDED TYPE
Single type
FDE71VNXWVH
Twin type
FDE71VNXWPVH
(OUTDOOR UNIT) (INDOOR UNIT)
FDC71VNX-W
FDT40VH
FDE40VH
Manual No.'19・PAC-SM-332
CEILING CASSETTE-4 WAY
COMPACT TYPE
Twin type
FDTC71VNXWPVH
DUCT CONNECTED-LOW/MIDDLE
STATIC PRESSURE TYPE
Single type
FDUM71VNXWVH
Twin type
FDUM71VNXWPVH
WALL MOUNTED TYPE
Single type
SRK71VNXWZR

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Summary of Contents for Mitsubishi Heavy Industries FDT71VNXWVH

  • Page 1 SERVICE MANUAL HYPER INVERTER PACKAGED AIR-CONDITIONERS (Split system, air to air heat pump type) CEILINING CASSETTE-4 WAY TYPE CEILING CASSETTE-4 WAY Single type COMPACT TYPE FDT71VNXWVH Twin type Twin type FDTC71VNXWPVH FDT71VNXWPVH DUCT CONNECTED-HIGH STATIC DUCT CONNECTED-LOW/MIDDLE PRESSURE TYPE STATIC PRESSURE TYPE...
  • Page 2 '19 • PAC-SM-332 TABLE OF CONTENTS 1. HYPER INVERTER PACKAGED AIR-CONDITIONERS ......... 2. V MULTI SYSTEM .................... 147...
  • Page 3 (4) Cooling low outdoor air temperature protective control ...... 31 (5) Heating high pressure control ............. 32 (6) Heating overload protective control ............. 32 '19 • PAC-SM-332 (7) Heating low outdoor temperature protective control ......33 (8) Compressor overheat protection ............
  • Page 4 '19 • PAC-SM-332 (7) Inspection procedures corresponding to detail of trouble ....131 (8) Phenomenon observed after short-circuit, wire breakage on sensor ...133 (9) Checking the indoor electrical equipment ...........133 (10) How to make sure of wireless remote control ........135 (11) Inspection procedure for blown fuse on the indoor unit PCB ....135 1.3 ELECTRICAL WIRING ................136 (1) Indoor units ..................136 (2) Outdoor unit ..................143...
  • Page 5 '16 • PAC-T-251 '19 • PAC-SM-332 1.10 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1.1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 1.1.1 Remote control (Option parts) 1.10.1 Remote control (1) Wired remote control Wired remote control Model RC-EX3A Model RC-EX3A ⑤ LCD (with backlight) ③...
  • Page 6 '19 • PAC-SM-332 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 7 '19 • PAC-SM-332 '16 • PAC-T-251 '16 • PAC-T-251 Wireless remote control Wireless remote control (2) Wireless remote control RCN-E2 ( Except SRK series ) Indication section Indication section ① OPERATION MODE display Indicates selected operation mode. SET TEMP display Indicates set temperature.
  • Page 8 '19 • PAC-SM-332 SRK series only Transmission section OPERATION MODE select button ON/OFF (luminous) button Each time the button is pressed, the Press to start operation, press again mode changes. to stop. TEMPERATURE button FAN SPEED button This button sets the room temperature. Each time the button is pressed, the fan speed changes.
  • Page 9 OFF TIMER button TIMER button This button selects OFF TIMER operation. This buttions is used for setting the cur- rent time and timer function. '19 • PAC-SM-332 WEEKLY button PROGRAM button This button switches the WEEKLY TIMER to ON/OFF. This button sets WEEKLY TIMER. CLEAN switch ACL switch This switch selects the CLEAN...
  • Page 10 '16 • PAC-T-251 '19 • PAC-SM-332 1.1.2 Operation control function by the wired remote control 1.10.2 Operation control function by the wired remote control ●Model RC-EX3A (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.
  • Page 11 '19 • PAC-SM-332 ●Content memorized with the power failure compensation are as follows. Note(1) Items (f) and (g) are memorized regardless whether the power failure compensation is effective or not while the setting of silent mode is cancelled regardless whether the power failure compensation is effective or not. At power failure –...
  • Page 12 '19 • PAC-SM-332 ● Model RC-E5 (1)　Switching sequence of the operation mode switches of remote control COOL HEAT AUTO (2)　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. (3)　Power failure compensation function (Electric power source failure) •...
  • Page 13 '19 • PAC-SM-332 1.1.3 Operation control function by the indoor control (Ⅰ) FDT, FDTC, FDU, FDUM, FDE series (1) Auto operation (a) If “Auto” mode is selected by the remote control, 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 14 '19 • PAC-SM-332 (ii) Regardless of the setting temperature, the cooling or heating operation mode is judged according to the "Judgment based on (ii) Regardless of the setting temperature, the cooling or heating operation mode is judged according to the "Judgment Room temperature/Cooling or Heating and Outdoor temperature/Cooling or Heating".
  • Page 15 '19 • PAC-SM-332 (b) FDU, FDUM, FDE series Return air temperature sensor [Thi-A (by the remote control when the remote control temperature sensor is enabled)] controls the indoor temperature environment simultaneously. (i) Operation is started in the cooling mode. When the difference between the return air temperature and the setting temperature is 2°C or less, the indoor unit fan tap is brought down by one tap.
  • Page 16 '19 • PAC-SM-332 (v) Timer operations which can be set in combination Item Timer OFF timer ON timer Weekly timer Item Timer Í Í OFF timer Í Í ON timer Í Weekly timer Í Í Í Notes (1) : Allowed Í: Not (2) Since the ON timer, sleep timer and OFF timer are set in parallel, when the times to turn ON and OFF the air-conditioner are duplicated, the setting of the OFF timer has priority.
  • Page 17 '19 • PAC-SM-332 (6) Hot keep Hot keep control is performed at the start of the defrost operation. (a) Control (i) When the indoor heat exchanger temperature (detected with Thi-R1 or R2) drops to less than 35°C, the speed of indoor fan follows fan setting at the time of thermostat OFF.
  • Page 18 '19 • PAC-SM-332 (8) Thermostat operation (a) Cooling (i) Thermostat is operated with the room temperature control. (ii) Thermostat is turned ON or OFF relative to the set room temperature as shown below. Thermostat ON Temperature drop Thermostat OFF Temperature rise Set room temperature (iii) Thermostat is turned ON when the room temperature is in the range of -1 <...
  • Page 19 '19 • PAC-SM-332 (d) Fan control during cooling thermostat OFF (i) Following fan controls during the cooling thermostat OFF can be selected with the indoor function setting of the wired remote control. ① Low fanspeed, ② Set fan speed (Factory default), ③ Intermittence, ④ Fan OFF (ii) When the “Low fan speed”...
  • Page 20 '19 • PAC-SM-332 (11) Drain pump control (a) This control is operated when the inverter frequency is other than 0 Hz during the cooling operation and automatic cooling and dehumidifying operations. (b) Drain pump ON condition continues for 5 minutes even when it enters the OFF range according to (i) above after turning the drain pump ON, and then stops.
  • Page 21 '19 • PAC-SM-332 (c) Operation check mode There is no communication with the outdoor unit but it allows performing operation in respective modes by operating the remote control. (d) 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 22 '19 • PAC-SM-332 (17) Plural unit control – Control of 16 units group by one remote control (a) Function One remote control can control a group of multiple number of unit (Max. 16 indoor units). “Operation mode” which is set by the remote control can operate or stop all units in the group one after another in the order of unit. No. Thermostat and protective function of each unit function independently.
  • Page 23 '19 • PAC-SM-332 (19) Abnormal temperature sensor (return air/indoor heat exchanger) broken wire/short-circuit detection (a) Broken wire detection When the return air temperature sensor detects -55°C or lower or the heat exchanger temperature sensor detect -55°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 sensor: E7, the heat exchanger temperature sensor: E6).
  • Page 24 '19 • PAC-SM-332 (b) Input for external control The external input for the indoor unit can be selected from the following input. Input name Content 1 Run/Stop Refer to [(20) (c) Remote operation input] 2 Premission/Prohibition Refer to [(21) Operation permission/prohibition] 3 Cooling/Heating Refer to [(23) Selection of cooling/heating external input function] 4 Emergency stop...
  • Page 25 '19 • PAC-SM-332 Individual operation (Factory default) All units operation (Local setting) Only the unit Only the unit All units in one All units in one directly connected CnT-6 or directly connected remote control remote control to the remote CnTA to the remote control system can be system can be...
  • Page 26 '19 • PAC-SM-332 (a) In case of CnT ① Operation stop level > CnTA ③ Operation permission/prohibition level Operation Operation Operation Stop Stop Stop Level input Operation permission Operation permission CnTA Operation prohibition Operation permission/ prohibition setting Operation Operation( ) Operation Stop Stop...
  • Page 27 '19 • PAC-SM-332 (22) Temporary stop input In case of temporary stop, operation lamp of remote control lights, but indoor/outdoor unit stop the operation. (a) In case of “level input” setting (Factory default) Input signal to CnT-6 or CnTA is OFF → ON : Temporary stop Input signal to CnT-6 or CnTA is OFF → ON : Normal operation CnT-6 or CnTA input Actual operation Temporary stop Temporary stop Remote control...
  • Page 28 '19 • PAC-SM-332 (24) Fan control at heating startup (a) Starting conditions At the start of heating operation, if the difference of setting temperature and return air temperature is 5°C or higher after the end of hot start control, this control is performed. (b) Contents of control (i) Sampling is made at each minute and, when the indoor heat exchanger temperature (detected with Thi-R) is 37°C or higher, present number of revolutions of indoor fan speed is increased by 10min...
  • Page 29 '19 • PAC-SM-332 (32) Fan circulator operation (RC-EX3A only) When the fan is used for circulation, the unit is operated as follows depending on the setting with the remote control. (a) If the invalid is selected with the remote control, the fan is operated continuously during the fan operation. (normal fan mode) (b) If the valid is selected with the remote control, the fan is operated or stopped when on the difference of the remote control temperature sensor and the return air temperature sensor becomes bigger than 3°C.
  • Page 30 '19 • PAC-SM-332 (37) Motion sensor control (RC-EX3A and RCN-E2 only) The sensor determines the presence of people and the amount of activity, and the following controls are done by the motion sensor. Following settings are necessary to activate motion sensor control. (a) Infrared (motion) sensor setting: Installation setting of remote control RC-EX3A The indoor unit which is set to “Enable”...
  • Page 31 '19 • PAC-SM-332 (i) Power saving / comfort control The set temperature is adjusted according to the presence of people and their amount of activity detected by the infrared (motion) sensor. MODE:AUTO/COOL/HEAT mode operation Heat Source & Activity High None Normal When the extent of human 33ºC...
  • Page 32 '19 • PAC-SM-332 '09•SRK-DB-087D (Ⅱ) SRK series (1) Unit ON/OFF button wireless wireless (a) Operation (b) Details of operation COOL, DRY HEAT Function Indoor temperature Fan speed Flap/Louver Timer switch setting Operation mode COOL Unit ON/OFF button HEAT (2) Auto restart function Jumper wire (JA1) (ii) (JA1)
  • Page 33 '19 • PAC-SM-332 (4) Selection of the annual cooling function The annual cooling control is valid from factory default setting. It is possible to dis- Jumper wire (JA3) able by cutting jumper wire (JA3), or changing the setting of DIP switch (SW2-4) on the interface kit (Option) PCB if it is connected.
  • Page 34 ③ When the operation is retrieved from CLEAN or ALLERGEN CLEAR operation. (b) When the following operation are set, ECONOMY operation will be canceled. ① When the HI POWER/ECONO button is pressed again. '19 • PAC-SM-332 ② When the operation mode is changed DRY to FAN. (c) Not operable while the air-conditioner is OFF.
  • Page 35 display Center installation Left Approx. 50° Left Approx. 20° Center Right Approx. 20° Right Approx. 50° '19 • PAC-SM-332 (c) Swing (ii) In HEAT operation In COOL, DRY, FAN operation Approx. 5° Approx. 35° Approx. 60° Approx. 70° (d) Memory ap (Flap or Louver stopped) '09•SRK-DB-087D (e) When not operating (8) 3D auto operation...
  • Page 36 Cooling Heating '19 • PAC-SM-332 Flap Up/down swing Center (Fixed) Louver Cooling Heating Flap Horizontal blowing (Fixed) Slant forwardl blowing (Fixed) Wide (Fixed) Louver Operation mode Air flow direction contorol Indoor temp. – Setting temp. 2°C < = 2°C < Indoor temp. – Setting temp. 5°C <...
  • Page 37 (c) OFF timer operation '19 • PAC-SM-332 (11) Installation location setting wireless (a) Setting If the air-conditioning unit is running, press the ON/OFF button to stop. (ii) Press the AIR FLOW U/D (UP/DOWN) button and the AIR FLOW L/R (LEFT/RIGHT) button together for 5 seconds or more.
  • Page 38 4-way valve (3 minutes ON) (b) Details of control at each operation mode (pattern) '19 • PAC-SM-332 Fuzzy operation Model SRK71ZR-W Fan speed 12-120rps AUTO 12-120rps 12-120rps 12-98rps 12-58rps '09•SRK-DB-087D '09•SRK-DB-087D (ii) Hot keep operation fan motor (13) Outline of cooling operation (13) Outline of cooling operation (a) Operation of major functional components in cooling mode (a) Operation of major functional components in cooling mode...
  • Page 39 (15) Outline of automatic operation 12-120rps AUTO 12-120rps (a) Determination of operation mode 12-100rps '19 • PAC-SM-332 12-76rps 12-50rps Cooling 27.5 (15) Outline of automatic operation (a) Determination of operation mode (a) Determination of operation mode 25.5 Operation mode is determined by indoor air temperature and outdoor air temperature as following. Dehumidifying Indoor air temperature (˚C) 18.0...
  • Page 40 '19 • PAC-SM-332 (ii) Contents of operation Air capacity control Model SRK71ZR-W Item Follow the table below Range A Upper limit of compressor’s command speed 54rps Range B Note (1) Ranges A and B are as shown below. ● Condition for Range A Compressor’s command speed is controlled according to the indoor Range B...
  • Page 41 '19 • PAC-SM-332 Indoor fan motor protection Serial signal transmission error protection Purpose (ii) Detail of operation Rotor lock Outdoor fan motor protection Outdoor fan control at low outdoor temperature Cooling Operating conditions Detail of operation Outdoor fan Outdoor temperature > 10(0)˚C Outdoor temperature <...
  • Page 42 '19 • PAC-SM-332 1.1.4 Operation control function by the outdoor control Model FDC71VNX-W (1) Determination of compressor speed (Frequency) Required frequency (a) Cooling/dehumidifying operation Unit: rps Model FDC71 Normal mode Max. required frequency Capcity save mode Min. required frequency (b) Heating operation Unit: rps Model FDC71...
  • Page 43 '19 • PAC-SM-332 (2) Compressor start control Compressor starts upon receipt of the thermostat ON signal from the indoor unit. (b) However, at initial start after turning the power source breaker, it may enter the standby state for maximum 30 minutes (“...
  • Page 44 '19 • PAC-SM-332 Outdoor fan control (a) Outdoor fan tap and fan motor speed Unit: min Model Mode Fan motor tap speed speed speed speed speed speed speed ① ② ③ ④ ⑤ ⑥ ⑦ FDC71 Cooling/Dehumidifying Heating (b) Fan tap control during cooling/defumidifying operation Fan taps are selected depending on the outdoor heat exchanger temperature (Tho-R1, R2) and the outdoor air temperature (Tho-A).
  • Page 45 '19 • PAC-SM-332 Defrost operation Model FDC71 (a) Starting conditions If all of the following defrost conditions A or conditions B are satisfied, the defrost operation starts. Defrost conditions A Cumulative compressor operation time after Defrost operation start temperature zone the end of defrost operation has elapsed 37 minutes, and the cumulative compressor operation time after the start of heating...
  • Page 46 '19 • PAC-SM-332 (c) Switching of defrost control with SW3-1 If SW3-1 on the outdoor control PCB is turned to ON, it becomes easier to enter the defrost operation. Use this when installing a unit at snowing regions. (ii) Control contents It allows entering the defrost operation under the defrost condition A when the cumulative heating operation time becomes 30 minutes.
  • Page 47 '19 • PAC-SM-332 (c) Heating high pressure protection Protective control As the indoor heat exchanger temperature (Thi-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 Reduces compressor frequency Model...
  • Page 48 '19 • PAC-SM-332 ( f ) Over-current protection current safe controls I, II Detecting the outdoor 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 49 '19 • PAC-SM-332 ( i ) Refrigerant quantity shortage protection Under the compressor protection start III control during cooling and dehumidifying operations, the following control is performed by detecting the indoor heat exchanger temperature (Thi-R) and the indoor return air temperature (Thi-A). [Control condition] When the state that the indoor heat exchanger temperature (Thi-R) does not become lower than the indoor return air temperature (Thi-A) by 4°C or more continues for 1 minute.
  • Page 50 '19 • PAC-SM-332 (9) Pump-down control Turning ON the pump-down switch SW8-3 for 2 seconds during the operation stop or anomalous stop (excluding the thermostat OFF), the pump-down operation is performed. (This is invalid when the indoor unit is operating. This is effective even when the indoor unit is stopped by the anomalous stop or the power source is turned OFF.) (a) Control contents Close the service valve at the liquid side.
  • Page 51 '19 • PAC-SM-332 1.2 MAINTENANCE DATA 1.2.1 FDT, FDTC, FDU, FDUM, FDE series 1.2.1.1 Diagnosing of microcomputer circuit (1) 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 control error code, indoor/outdoor unit green LED (power pilot lamp and microcomputer normality pilot lamp) or red LED (check pilot lamp).
  • Page 52 '19 • PAC-SM-332 (ii) Outdoor unit FDC71VNX-W Outdoor Remote control Indoor unit control PCB Outdoor unit control PCB inventer Reference Location of trouble Description of trouble Repair method page Green Green Yellow Error code Red LED Red LED Red LED LED (1) LED (1) Installation or operating...
  • Page 53 '19 • PAC-SM-332 (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 54 '19 • PAC-SM-332 ■ Error log and reset Error indicator Memorized error log Reset Remote control display • Higher priority error is memorized. • Stop the unit by pressing the ON/OFF switch of remote control. Red LED on indoor unit control PCB •...
  • Page 55 '19 • PAC-SM-332 1) Model FDT series a) Replace the control PCB i) Unscrew terminal (Arrow A) of the "E1" wiring (yellow/green) that is connected to PCB. ii) Replace the PCB only after all the wirings connected to the connector are removed. iii) Fix the board such that it will not pinch any of the wires.
  • Page 56 '19 • PAC-SM-332 2) Model FDTC series PSC012D050 Replace and set up the PCB according to this instruction. i) 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 57 '19 • PAC-SM-332 3) Models FDU, FDUM, FDE series PSB012D990B a) Control PCB Replace and set up the PCB according to this instruction. i) Set to an appropriate address and function using switch on PCB. 　 Select the same setting with the removed PCB. Item Switch Content of control...
  • Page 58 '19 • PAC-SM-332 b) Power PCB This PCB is a general PCB. Replace the PCB according to this instruction. This PCB is a general PCB. Replace the PCB according to this instruction. i) Replace the PCB i)Replace the PCB ① Unscrew terminal of the wiring(yellow/green) connected to terminal block (CNWO) from the box. �...
  • Page 59 ③ Fix the board such that it will not pinch any of the wires. ④ Reconnect the wirings to the PCB. Wiring connector color should match with the color of connector of the PCB. ⑤ Screw back the terminal of wiring, that was removed in ①. '19 •...
  • Page 60 '19 • PAC-SM-332 ●DIP switch setting list ●DIP switch setting list Switch Switch Description Description Default setting Default setting Remark Remark Address No. setting at plural indoor units control by 1 R/C Address No. setting at plural indoor units control by 1 R/C SW5-1 SW5-1 Master * /Slave...
  • Page 61 '19 • PAC-SM-332 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 code dispalyed on the remote control and flashing pattern of indicator lamps (Red LED and Green LED), and then proceed further inspection and remedy it.
  • Page 62 '19 • PAC-SM-332 PCA012D049A Model FDC71VNX-W Model FDC71VNX-W Model FDC71VNX-W 1) Replace the PCB after elapsing 3 minutes from power OFF. 1) Replace the PCB after elapsing 3 minutes from power OFF. 1) Replace the PCB after elapsing 3 minutes from power OFF. (Be sure to measure voltage (DC) between T26 and T27 on inverter PCB, and check that the (Be sure to measure voltage (DC) between T26 and T27 on inverter PCB, and check that the (Be sure to measure voltage (DC) between T26 and T27 on inverter PCB, and check that the...
  • Page 63 '19 • PAC-SM-332 (c) Outdoor inverter PCB replacement procedure (c) Outdoor inverter PCB replacement procedure Precautions for Safety Precautions for Safety • Since the following precaution is the important contents for safety, be sure to observe them. • Since the following precaution is the important contents for safety, be sure to observe them. WARNING and CAUTION are described as follows: WARNING and CAUTION are described as follows: WARNING...
  • Page 64 '19 • PAC-SM-332 Inverter PCB Power source for inverter PCB ：Between T26 and T27 Check that the voltage is discharged sufficiently. After elapsing 3 minutes from power OFF Presence and shape of electric component may vary according to model. Fig.2 Voltage measurement points Remove the harness bands from control unit after Presence and shape of electric component removing the harnesses from harness bands.
  • Page 65 Reserved Keep OFF SW7-3 SW8-1 Reserved Keep OFF Reserved Keep OFF SW8-2 Reserved Keep OFF SW8-3 '19 • PAC-SM-332 Pump down operation Normal*/Pump down Normal * Default setting (b) Models FDC100, 125, 140VNX, 100, 125, 140VSX DIP switch setting list (Outdoor unit) Switch Description Default setting...
  • Page 66 '19 • PAC-SM-332 (5) Check of anomalous operation data with the remote control (a) In case of RC-EX3A remote control [Operating procedure] ➀ On the TOP screen, touch the buttons in the order of “Menu” ➝ “Service setting” ➝ “Service & Maintenance” ➝ “Service password”...
  • Page 67 '19 • PAC-SM-332 (b) In case of RC-E5 remote control Number Data Item Operation data can be checked with remote control unit operation. (Operation Mode) (Set Temperature) ➀ Press the button. (Return Air Temperature) The display change “ ” (Remote Control Temperature Sensor) ➁...
  • Page 68 '19 • PAC-SM-332 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? 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 69 '19 • PAC-SM-332 (7) Inverter checker for diagnosis of inverter output Model FDC71VNX-W Model FDC71VNX-W (i) 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 70 '19 • PAC-SM-332 Outdoor unit control failure diagnosis circuit diagram Model FDC71VNX-W • Outdoor unit check points...
  • Page 71 '19 • PAC-SM-332 1.2.1.2 Troubleshooting flow (1) List of troubles Model FDC71VNX-W Remote control display Description of trouble Reference page None Operates but does not cool None Operates but does not heat None Earth leakage breaker activated None Excessive noise/vibration (1/3) None Excessive noise/vibration (2/3) None...
  • Page 72 '19 • PAC-SM-332 (2) Troubleshooting Green Content Error code Keeps flashing Stays OFF Indoor None Remote control: Operates but does not cool Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Check the indoor fan operation. Check the temperature difference between return and supply air.
  • Page 73 '19 • PAC-SM-332 Green Content Error code Keeps flashing Stays OFF Indoor None Operates but does not heat Remote control: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Check the indoor fan operation. Check the temperature difference between return and supply air.
  • Page 74 '19 • PAC-SM-332 Green Content Error code Stays OFF Stays OFF Indoor None Earth leakage breaker activated Remote control: Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Are OK the insulation resistance and Replace compressor. resistance between terminals compressor? (1)0.722 or more at 20...
  • Page 75 '19 • PAC-SM-332 Green Content Error code – – Indoor None Excessive noise/vibration (1/3) Remote control: – – Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure If excessive noise/vibration persists when sufficient Does time has elapsed after noise/vibration stopping the unit, it is occur during or soon after stopping operation considered that the air-...
  • Page 76 '19 • PAC-SM-332 Green Content Error code – – Indoor None Excessive noise/vibration (2/3) Remote control: – – Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure From previous page Rearrange the piping to Are the pipes avoid contact with the contacting the casing.
  • Page 77 '19 • PAC-SM-332 Green Content Error code – – Indoor None Excessive noise/vibration (3/3) Remote control: – – Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure From previous page If insufficient cooling/ 〔 Adjustment heating problem happens during commissioning 〕 due to anomalous operating Does noise/vibration occur when the conditions at cooling/...
  • Page 78 '19 • PAC-SM-332 Green Content Error code Louver motor failure Keeps flashing Stays OFF Indoor None Remote control: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model FDT, FDTC, FDE series Diagnosis Countermeasure ▲ Check at the indoor unit side. Operate after waiting for more than 1 minute.
  • Page 79 '19 • PAC-SM-332 Green Error code Content Power source system error Indoor Stays OFF Stays OFF Remote control: None (Power source to indoor unit control PCB) Outdoor 2-time flash Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure AC220/240V detected between on the terminal block of indoor unit?
  • Page 80 '19 • PAC-SM-332 Green Content Error code Power source system error Keeps flashing Stays OFF Indoor None Remote control: (Power source to remote control) Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the connection of the Correct ➞...
  • Page 81 '19 • PAC-SM-332 Green Content Error code INSPECT I/U Keeps flashing Stays OFF Indoor INSPECT I/U Remote control: (When 1 or 2 remote controls are connected) Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Are 2 units of remote control connected? ⑴，...
  • Page 82 '19 • PAC-SM-332 Green Content Error code INSPECT I/U Keeps flashing Stays OFF Indoor INSPECT I/U Remote control: (Connection of 3 units or more remote controls) Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Are more than Reduce to 2 units or less.
  • Page 83 '19 • PAC-SM-332 Green Content Communication error at Error code Keeps flashing Stays OFF Indoor Remote control: WAIT initial operation (1/3) Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure “ ” is still displayed on the WAIT remote control LED 2 minutes after power ON.
  • Page 84 '19 • PAC-SM-332 Green Content Communication error at Error code Keeps flashing Stays OFF Indoor Remote control: WAIT initial operation (2/3) Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Diagnosis for when the outdoor unit control PCB LED is turned off Shut down the breaker and back on again the breaker 3 minutes later.
  • Page 85 '19 • PAC-SM-332 Green Communication error at Content Error code Keeps flashing Stays OFF Indoor Remote control: initial operation (3/3) WAIT Keeps flashing 2-time flash Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Method to check for inverter PCB before replacement of blown power source fuse.
  • Page 86 '19 • PAC-SM-332 Green Content Error code No display Stays OFF Stays OFF Indoor None Remote control: Stays OFF Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Remote control does not display anything after the power on. Is DC10V or Defective remote control higher detected at remote control connection terminals?
  • Page 87 '19 • PAC-SM-332 Green Content Error code Remote control Keeps flashing Stays OFF Indoor Remote control: communication circuit error Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is it possible to Malfunction by noise reset normally by the Check peripheral power reset? environment.
  • Page 88 '19 • PAC-SM-332 Green Content Error code Keeps flashing 2-time flash Indoor Communication error during operation Remote control: Keeps flashing See below Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure ● In case that the outdoor unit red LED flashes 2-time Note (1) Inspect faulty connections (disconnection, looseness) on the outdoor unit terminal block.
  • Page 89 '19 • PAC-SM-332 Green Content Error code Indoor heat exchanger Keeps flashing 1-time flash Indoor Remote control: temperature sensor anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the connection of indoor heat Correct. ➞ Insert connector exchanger temperature sensor securely.
  • Page 90 '19 • PAC-SM-332 Green Content Error code Return air temperature Keeps flashing 1-time flash Indoor Remote control: sensor anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the connection of return Correct. ➞ Connect air temperature sensor connector.
  • Page 91 '19 • PAC-SM-332 Green Content Error code Keeps flashing 1-time flash Indoor Heating overload operation Remote control: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the air filter clogged? Wash. 2. Error detection method Is the indoor heat exchanger Defective indoor heat temperature sensor...
  • Page 92 '19 • PAC-SM-332 Green Content Error code Drain trouble Keeps flashing 1-time flash Indoor Remote control: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model FDT, FDTC, FDU, FDUM Diagnosis Countermeasure series Check the error data in the remote control. Is there any overflow? Is DC12V at CNI connector?
  • Page 93 '19 • PAC-SM-332 Excessive number of connected Green Content Error code indoor units (more than 17 units) Keeps flashing Stays OFF Indoor Remote control: by controlling with one remote control Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Are more than 17...
  • Page 94 '19 • PAC-SM-332 Green Content Error code Address setting error of Keeps flashing Stays OFF Indoor Remote control: indoor units Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure E11 occurs Is “Master IU address set” function of remote 2.
  • Page 95 '19 • PAC-SM-332 Green Content Error code Communication error Keeps flashing 3-time flash Indoor Remote control: between master and slave indoor units Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is it OK the unit Correct unit address setting. address setting for master and slave indoor units?
  • Page 96 '19 • PAC-SM-332 Green Content Error code Indoor fan motor anomaly Keeps flashing 1-time flash Indoor Remote control: Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Does any foreign material Remove foreign material. intervene in rotational area of fan propeller? Does the fan 2.
  • Page 97 '19 • PAC-SM-332 Green Content Error code Address setting error of Keeps flashing 1-time flash Indoor Remote control: master and slave indoor units Keeps flashing Stays Off Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure E18 occurs Is “Master IU address set”...
  • Page 98 '19 • PAC-SM-332 Green Content Error code Indoor unit operation check, Keeps flashing 1-time flash Indoor Remote control: drain pump motor check setting error Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure E19 occurs when the power ON Is SW7-1 Defective indoor unit on the indoor unit control...
  • Page 99 '19 • PAC-SM-332 Green Content Indoor fan motor rotation Error code Keeps flashing 1-time flash Indoor Remote control: speed anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Does any foreign material Remove foreign material. intervene in rotational area of fan propeller? Does the fan 2.
  • Page 100 '19 • PAC-SM-332 Green Content Error code Remote control Keeps flashing Stays OFF Indoor Remote control: temperature sensor anomaly Keeps flashing Stays OFF Outdoor 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the remote Correct connector. control temperature sensor connected properly? 2.
  • Page 101 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Cooling overload operation Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure * For the characteristics of outdoor heat exchanger temperature sensor, Are the refer to E37.
  • Page 102 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Discharge pipe Remote control: Outdoor control PCB Keeps flashing 1-time flash Yellow LED temperature error Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure * For the characteristics of discharge Are the pipe temperature sensor, refer to E39.
  • Page 103 '19 • PAC-SM-332 Green Outdoor heat Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: exchanger temperature Outdoor control PCB Keeps flashing 1-time flash Yellow LED sensor anomaly Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the...
  • Page 104 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Outdoor air temperature Remote control: Outdoor control PCB Keeps flashing 1-time flash Yellow LED sensor anomaly Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure the outdoor air Correct connector.
  • Page 105 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Discharge pipe temperature Outdoor control PCB Keeps flashing 1-time flash Yellow LED sensor anomaly Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the discharge pipe...
  • Page 106 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF High pressure error Remote control: Outdoor control PCB Keeps flashing 1-time flash (63H1 activated) Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure If the power source breaker is turned OFF and ON too quickly, E40 may be displayed.
  • Page 107 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Power transistor overheat Yellow LED Outdoor inverter 6-time flash 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure ⑴ ⑵ Is DC15V detected Replace inverter PCB .
  • Page 108 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Current cut (1/2) Yellow LED Outdoor inverter 1-time flash 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the power source Check power source.
  • Page 109 '19 • PAC-SM-332 Green Error code Content Indoor Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Current cut (2/2) Yellow LED Outdoor inverter 1-time flash 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure From previous page Is the checked result of power Defective inverter (or...
  • Page 110 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Communication error between Remote control: Outdoor control PCB Keeps flashing 1-time flash inverter PCB and outdoor unit control PCB Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1.
  • Page 111 '19 • PAC-SM-332 Green Error code Content Indoor Keeps flashing Stays off Remote control: Inverter PCB A/F module anomaly Outdoor control PCB Keeps flashing 1-time flash Yellow LED Outdoor inverter 7-time flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the power source Check power source.
  • Page 112 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 1-time flash Outdoor fan motor anomaly Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Does any foreign Remove foreign material.
  • Page 113 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Low pressure error or Remote control: Outdoor control PCB Keeps flashing 1-time flash low pressure sensor anomaly (1/2) Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1.
  • Page 114 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Low pressure error or Remote control: Outdoor control PCB Keeps flashing 1-time flash low pressure sensor anomaly (2/2) Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1.
  • Page 115 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Inverter and fan motor anomaly Outdoor control PCB Keeps flashing 1-time flash Yellow LED Outdoor inverter 6-time flash 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure •...
  • Page 116 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Suction pipe Remote control: Outdoor control PCB Keeps flashing 1-time flash temperature sensor anomaly Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Is the connection Correct connection of...
  • Page 117 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Low pressure sensor anomaly Outdoor control PCB Keeps flashing 1-time flash Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure Are the connection of low pressure Correct low pressure sensor...
  • Page 118 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Insufficient refrigerant amount Remote control: Outdoor control PCB Keeps flashing 1-time flash or detection of service valve closure Yellow LED Outdoor inverter Keeps flashing 5. Troubleshooting 1.
  • Page 119 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 5-time flash Compressor startup failure (1/2) Yellow LED Outdoor inverter Stays OFF 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure In case that the compressor does not start at all and no sound or vibration exists...
  • Page 120 '19 • PAC-SM-332 Green Error code Content Indoor control PCB Keeps flashing Stays OFF Remote control: Outdoor control PCB Keeps flashing 5-time flash Compressor startup failure (2/2) Yellow LED Outdoor inverter Stays OFF 5. Troubleshooting 1. Applicable model Diagnosis Countermeasure From previous page Is the (Inverter PCB anomaly)
  • Page 121 '09•SRK-DB-087D '19 • PAC-SM-332 Reference Reference 1.2.2 SRK series This chapter has described about an indoor unit. Look at 1.2.1 chapters about the outdoor unit. 2 TROUBLESHOOTING PROCEDURES FOR ELECTRICAL EQUIPMENT (1) Cautions (2) Items to check before troubleshooting source (3) Troubleshooting procedure (If the air-conditioner does not run at all) satisfied Important...
  • Page 122 '09•SRK-DB-087D '19 • PAC-SM-332 (4) Troubleshooting procedure (If the air-conditioner runs) See page 122. See pages 123 - 129. See pages 123 - 129.
  • Page 123 '09•SRK-DB-087D '19 • PAC-SM-332 (5) Self-diagnosis table Wired Indoor unit display panel remote Description Cause Display (flashing) condition control TIMER of trouble display light light When a heat exchanger sensor 1 wire disconnection is detected while • Broken heat exchanger sensor 1-time Heat exchanger 1 wire, poor connector...
  • Page 124 '19 • PAC-SM-332 (6) Service mode (Trouble mode access function) (a) Explanation of terms Explanation Term The service mode is the mode where service data are displayed by flashing of the display Service mode lights when the operations in item (b) below are performed with the indoor control. These are the contents of error displays and protective stops which occurred in the past in the air-conditioner system.
  • Page 125 '19 • PAC-SM-332 4-time flash 2-time flash. wireless mode mode Self-diagnosis data wireless mode mode Wireless remote control setting Contents of output data Operation mode Fan speed mode wireless Indicates the number of Wireless remote control setting occasions previous to the present Temperature setting the error display data are from.
  • Page 126 '09•SRK-DB-087D '19 • PAC-SM-332 (Example) Wireless remote control setting Operation Displayed data Fan speed Temperature mode mode setting Displays the reason for the stop (error code) the previous time an error was displayed. 21ºC Displays the reason for the stop (error code) 2 times previous when an error was displayed. 22ºC Cooling 23ºC...
  • Page 127 '19 • PAC-SM-332 (c) Error code, stop code table Number of flashes when in service mode Stop coad Error Auto TIMER Error content Cause Occurrence conditions display recovery light light Error coad (10's digit) (1's digit) Normal The wired remote control wire Y is open. The wired remote control wires X and Y are reversely connected.
  • Page 128 '09•SRK-DB-087D '19 • PAC-SM-332 4-time flash 2-time flash. (d) Operation mode, Fan speed mode information tables (i) Operation mode (ii) Fan speed mode Display pattern when Display pattern when Fan speed in service mode in service mode Operation mode mode when when there is an there is an RUN light...
  • Page 129 '09•SRK-DB-087D '19 • PAC-SM-332 (e) Temperatare information Room temperature sensor, indoor heat exchanger temperature sensor, outdoor air temperature sensor, outdoor heat exchanger temperature sensor temperature Unit: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) temperature information Sensor value displayed when the error code is normal...
  • Page 130 '09•SRK-DB-087D '19 • PAC-SM-332 (ii) Discharge pipe sensor temperature Unit: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (sounds for 0.1 second) (does not sound) temperature information Sensor value displayed when the error code is normal -64ºC data 0.1 sec.
  • Page 131 '09•SRK-DB-087D '19 • PAC-SM-332 Service data record form Wireless r Operation mode Fan speed mode Wireless r Wireless r Wireless r Wireless r Wireless r wireless 124)
  • Page 132 '09•SRK-DB-087D '19 • PAC-SM-332 (7) Inspection procedures corresponding to detail of trouble Sensor error Broken sensor wire, connector poor connection Sensor temperature characteristics (Room temperature, indoor heat exchanger temperature) (Short-circuit) - 10 Temperature (˚C) Indoor fan motor error Defective fan motor, connector poor connection, defective indoor unit PCB the fan motor and indoor unit PCB separately.
  • Page 133 '09•SRK-DB-087D '19 • PAC-SM-332 Error of signal transmission Wiring error including power cable, defective indoor/ outdoor unit PCB source ② ③ Defective outdoor unit PCB ② ③ Defective outdoor unit PCB. Check crossover wires. ① ② Defective indoor unit PCB...
  • Page 134 '19 • PAC-SM-332 (8) Phenomenon observed after short-circuit, wire breakage on sensor Phenomenon Operation Sensor mode Short-circuit Disconnected wire Cooling Room temperature sensor Heating Cooling Freezing cycle system protection trips and stops the compressor. Heat exchanger temperature sensor Heating Cooling Humidity sensor Heating '09•SRK-DB-087D...
  • Page 135 blocks ② and ③ oscillating between PCB. DC 0 and 20V? '19 • PAC-SM-332 Indoor electrical components are normal. (b) Indoor fan motor check procedure This is a diagnostic procedure for determining if the indoor fan motor or the indoor unit PCB is broken down. (i) Indoor unit PCB output check in the following figure are output for approximately 30 seconds, it means that the indoor unit PCB is normal and the fan motor is broken down...
  • Page 136 Operation SW ON Measure in this section '19 • PAC-SM-332 (10) How to make sure of wireless remote control wireless wireless wireless wireless wireless wireless Simplified check methd of wireless remote control   It is normal if the signal transmission section of the wireless remote control emits a whitish light at each transmission on the monitor of digital camera.
  • Page 137 '19 • PAC-SM-332 1.3 ELECTRICAL WIRING (1) Indoor units (a) Ceiling cassette-4 way type (FDT) Models FDT40VH, 71VH PJF000Z554...
  • Page 138 '19 • PAC-SM-332 (b) Ceiling casette-4 way compact type (FDTC) Model FDTC40VH PJF000Z516...
  • Page 139 '19 • PAC-SM-332 (c) Duct connected-High static pressure type (FDU) Model FDU71VH PJG000Z578...
  • Page 140 '19 • PAC-SM-332 (d) Duct connected-Low / Middle static pressure type (FDUM) Model FDUM40VH PJG000Z488...
  • Page 141 '19 • PAC-SM-332 Model FDUM71VH PJG000Z489...
  • Page 142 '19 • PAC-SM-332 (e) Ceiling suspended type (FDE) Models FDE40VH, 71VH PFA004Z087...
  • Page 143 '19 • PAC-SM-332 (f) Wall mounted type (SRK) Model SRK71ZR-W RWA000Z417...
  • Page 144 '19 • PAC-SM-332 (2) Outdoor unit Model FDC71VNX-W PCA001Z880...
  • Page 145 (Thi-R2) Capillary tube Receiver Electronic Service valve expansion valve Flare connecting (Flare connecting) (EEV) '19 • PAC-SM-332 Capillary tube Liquid line Strainer Muffler 1.4 PIPING SYSTEM (1) FDT, FDTC, FDU, FDUM, FDE series Models FDT71, 100, 125, 140 (a) Single type Model 71 Indoor unit Outdoor unit...
  • Page 146 '19 • PAC-SM-332 Preset point of the protective devices Equipped 71 model Parts name Mark unit Temperature sensor OFF 63℃ (for protection Thi-R ON 56℃ overloading in heating) Indoor unit Temperature sensor OFF 1.0℃ Thi-R (for frost prevention) ON 10℃ Temperature sensor OFF 65℃...
  • Page 147 '19 • PAC-SM-332 Models FDT71, 100, 125, 140 (2) SRK series Model 71 Indoor unit Outdoor unit Cooling cycle Heating cycle Indoor unit Outdoor unit Gas pipe Check joint 4-way valve Heating cycle Cooling cycle Temperature sensor (φ15.88) (Tho-A) Service valve Outdoor air Muffler temperature sensor...
  • Page 148 '19 • PAC-SM-332 2. V MULTI SYSTEM 2.1 HYPER INVERTER PACKAGED AIR-CONDITIONERS CONTENTS 2.1.1 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER … See page 4. 2.1.2 MAINTENANCE DATA ………………………………………… See page 50. 2.1.3 ELECTRICAL WIRING ……………………………………… See page 136. 2.1.4 PIPING SYSTEM ………………………………………………...
  • Page 149 INVERTER WALL MOUNTED TYPE RESIDENTIAL AIR-CONDITIONERS Air-Conditioning & Refrigeration Systems 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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