Daikin LRMEQ3BY1 Service Manual
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Daikin LRMEQ3BY1 Service Manual

Air cooled refrigeration condensing unit
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ESIE17-20A
Service
Manual
Air Cooled Refrigeration
Condensing Unit
Condensing Unit
LRMEQ3~4BY1

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  • Page 1 ESIE17-20A Service Manual Air Cooled Refrigeration Condensing Unit Condensing Unit LRMEQ3~4BY1...

  • Page 3: Table Of Contents

    ESIE17-20A Air Cooled Refrigeration Condensing Unit LRMEQ3BY1, LRMEQ4BY1 1. Version Log .....................3 2. Introduction .....................4 3. Standard Specification ................9 3.1 Standard Specification ................9 3.2 Set Values for Functional Components and Protection Devices....10 3.3 Operation Conditions................11 3.3.1 Piping Connection Diagram ............12 3.4 Wiring Diagram..................13...
  • Page 4 ESIE17-20A 6.5 Charging refrigerant ................54 6.5.1 Precautions when charging refrigerant ........54 6.5.2 To determine the additional refrigerant amount ......54 6.5.3 To charge refrigerant..............55 6.5.4 Precautions for refrigerant cylinder ..........58 6.5.5 Error codes when charging refrigerant........58 6.5.6 To fix the fluorinated greenhouse gases label ......58 6.6 Checklist before commissioning.............59 6.7 Checklist during commissioning .............60 6.7.1 About test run................60...

  • Page 5: Version Log

    ESIE17-20A Version Log 1. Version Log Version code Description Date ESIE17-20 Document release January 2018 ESIE17-20A Correction Thermostat ON/OFF conditions February 2018 Air Cooled Refrigeration Condensing Unit...

  • Page 6: Introduction

    Introduction ESIE17-20A 2. Introduction Safety Precautions Before performing design, construction, or maintenance, thoroughly read the "Safety Precautions" and also the Installer and User Reference Guide that come with this product. Precautions are classified as " WARNING" or " CAUTION" for the purpose of this Section. Items that mishandling highly potentially induces serious consequences such as death or serious injury are specially described under "...
  • Page 7 ESIE17-20A Introduction CAUTION (6) Do not start or stop the air (10) To clean the equipment, be conditioner using the POWER sure to set the POWER SUPPLY switch. SUPPLY switch to "OFF" to turn OFF all power supplies. Doing so may result in a Not doing so may result in injury failure or water leakage.
  • Page 8 Introduction ESIE17-20A WARNING (16) Conduct electrical works (19) Do not cause damage to or according to information in process the power supply cord. the "Electrical Equipment Doing so will result in an Doing so will result in an Technical Standards", electric shock or a fire.
  • Page 9 ESIE17-20A Introduction <III. Precautions after Construction and Repair> WARNING (24) Check power supply terminals Not doing so will result in an for deposition of dust or for electric shock, heat generation, or a fire. any loose terminals. Deposition of dust on or (26) Do not connect the power imperfect connections of supply cord halfway or with...
  • Page 10 Introduction ESIE17-20A Air Cooled Refrigeration Condensing Unit Nomenclature  Outdoor unit Power supply symbol Y1: 3φ 380-415V, 50Hz Indicates major design category Capacity indication 3: 3HP (3, 4) Refrigerant Q: R-410A Compressor type E: Intermediate INJ type Application M: Medium temperature Product category L: Low temperature air conditioner R: Outdoor unit...

  • Page 11: Standard Specification

    ESIE17-20A Standard Specification 3. Standard Specification Standard Specification Model LRMEQ3BY1 LRMEQ4BY1 Power Supply 3 phase 50Hz 380-415V Capacity 1 Range of Suction Pressure Equivalent °C -20~+5 Saturation Temperature Range of Outdoor Temperature °C -20~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H×W×D)

  • Page 12: Set Values For Functional Components And Protection Devices

    Standard Specification ESIE17-20A Set Values for Functional Components and Protection Devices Electric Component LRMEQ3·4BY1 symbol Compressor Inverter Type JT1GKDKTNYR@SB Overcurrent protection device 12.5A Fan motor Output Overcurrent protection device 1.8A Output Overcurrent protection device 1.8A Main PCB EC15001-5 INV. PCB PC17003-3 Electronic expansion valve Coil...

  • Page 13: Operation Conditions

    ESIE17-20A Standard Specification Operation Conditions Item Standard for use Refrigerant R-410A Refrigeration oil Daphne FVC68D Range of evaporating temperature (Te) -20°C ~ +5°C ∗3 Range of outdoor temperature -20°C ~ +43°C Suction gas superheated degree 10K or higher Suction gas temperature 20°C or lower Voltage regulation Within ±10% of rated voltage...

  • Page 14: Piping Connection Diagram

    Standard Specification ESIE17-20A 3.3.1 Piping Connection Diagram For details, refer to the installation manual and technical guide included with the unit. The piping lengths and height differences must comply with the following requirements. Requirement Limit Maximum actual piping length  Example: a+b+c+d2≤Limit Maximum total piping length ...

  • Page 15: Wiring Diagram

    ESIE17-20A Standard Specification Wiring Diagram 3N~, 50 Hz Q1DI 380 - 415 V -t° -t° -t° -t° -t° -t° X3M C C1 R P1P2 S1NPL S1NPH X1M L1 L2 L3 N Z1C N=3 X27A X26A X28A X25A X11A X13A X12A X17A X18A 3 4 5...

  • Page 16: Piping Diagram

    Standard Specification ESIE17-20A Piping Diagram Air Cooled Refrigeration Condensing Unit...

  • Page 17: Description And Layout Of Functional Parts And Piping Diagram

    ESIE17-20A Standard Specification Description and Layout of Functional Parts and Piping Diagram Electric Name Function symbol M1F/ Fan motor (upper/lower) Used to operate a fan for heat exchange through an air heat exchanger. Heat exchanger — Changes the refrigerant from a gas- to a liquid state. Refrigerant gas discharged from the compressor contains lubricating oil in the compressor.
  • Page 18 Standard Specification ESIE17-20A LRMEQ3BY1, LRMEQ4BY1 Air Cooled Refrigeration Condensing Unit...

  • Page 19: External Wiring Diagram

    ESIE17-20A Standard Specification External Wiring Diagram TeS1 Ry 1 t° P1 P2 t° Ry 0 Ry 0 Ry 0 t° t° F1 F2 F1 F2 Ry 0 Ry 0 Ry 1 Ry 0 3D111889 Outdoor unit Indoor unit To indoor unit Earth leakage circuit breaker High voltage wiring intake Control board (field supply)

  • Page 20: Cooling Capacity Characteristics

    Standard Specification ESIE17-20A Cooling Capacity Characteristics Air Cooled Refrigeration Condensing Unit...

  • Page 21: Field Settings

    ESIE17-20A Field Settings 4. Field Settings Condensing Unit 4.1.1 Target Evaporating Temperature Setting The target evaporating temperature can be calculated as follows: Tst: Target evaporating temperature Tsd: Evaporating temperature set by setting [2-0] Tsp: Temperature correction setting by setting [2-1]. Tsn: Temperature correction setting during night-time operation by setting [2-13] Tst =Tsd + Tsp +...
  • Page 22 Field Settings ESIE17-20A (2) Setting of target evaporating temperature correction value ( Tsp) [2-1] Follow the procedure below to set a target evaporating temperature correction value by the BS buttons. The target evaporating temperature correction allows you to set a target evaporating temperature in 1 °C increments. Setting change procedure Remarks Default display...

  • Page 23: Evaporation Temperature Correction At Night-Time, Using An External Contact

    ESIE17-20A Field Settings 4.1.2 Evaporation temperature correction at night-time, using an external contact An external contact can be used to increase the evaporating temperature at night. The following describes the wiring needed to use an external contact. By a short circuit between terminals A and B on terminal X2M, the evaporating temperature can be corrected at night-time.

  • Page 24: External Output Settings

    Field Settings ESIE17-20A 4.1.3 External Output Settings  Error Output The error output can be detected from the terminal strip, X2M. The types of error output that can be detected are as follows:  C/C1 Caution Output - Contact output will occur when an error which will not lead to an abnormal stop is detected.

  • Page 25: Revolution Of Condenser Fan Limiting

    ESIE17-20A Field Settings 4.1.4 Revolution of Condenser Fan Limiting Set the maximum value of condenser fan step. See the "outdoor unit fan tap table" on P.39 for relation between the numbers of step and revolution. Setting [2-3] Standard setting High static pressure setting Setting 1 (Factory set) Setting 2 Setting 3...

  • Page 26: Low Noise Mode Setting

    Field Settings ESIE17-20A 4.1.5 Low Noise Mode Setting You can control the compressor operational frequency and revolution of the external fan to adjust the operation as shown in F1 F2 the control flow below. B C D To OUT/D You can set the low noise control to ON/OFF by external input. unit Cooling in operation OFF: Normal mode...
  • Page 27 ESIE17-20A Field Settings Setting [2-18] - Low noise operation With this setting one of three low-noise operation modes can be selected. Low-noise mode can be activated by turning ON the contact between terminals X2M/A and X2M/B. Refer to settings [2-13] and [2-17] to set parameters for the low- noise levels.

  • Page 28: Change Of Inv Compressor Load-Up Rate

    Field Settings ESIE17-20A 4.1.6 Change of INV Compressor Load-up Rate This field setting aims to increase the frequency increment and speed up cooling when there is a big difference between the target evaporating temperature and the actual evaporating temperature due to pull-down or other reasons. INV compressor load-up rate change conditions ...
  • Page 29 ESIE17-20A Field Settings Setting of INV load-up rate [2-55] Setting change procedure Remarks Default display Press the MODE (BS1) button for 5 seconds or longer. The LED indicates the number of Press the SET (BS2) button 12 times you have pressed the button times.

  • Page 30: Setting In Service Mode

    Field Settings ESIE17-20A 4.1.7 Setting in service mode Using BS button on the outdoor unit Main PCB (A1P) enables a variety of settings shown below. MODE RETURN RESET The following 4 modes are available. Initial state (while in normal operation): Used to make setting of the method of "Cool/Heat a.
  • Page 31 ESIE17-20A Field Settings  LED display when power is ON H2P blinks for the first 5 seconds when the power supply is turned ON. If the equipment is normal, H2P will be turned OFF in 5 seconds. H2P lights for abnormality. : ON : OFF : BLINK...

  • Page 32: Setting At Replacement By Spare Pcb

    Field Settings ESIE17-20A 4.1.8 Setting at replacement by spare PCB For mini-ZEAS dip switches are not used. A capacity adapter needs to be installed in the main PCB on connector X51A. 4PA54367-7 T112 4PA54367-10 Air Cooled Refrigeration Condensing Unit...
  • Page 33 ESIE17-20A Field Settings b-1. Setting mode 2 Display of setting items Display of setting conditions Setting item H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P -10°C (Factory setting) Tsd target evaporating -20°C temperature set in increments -15°C of 5°C -5°C...
  • Page 34 Field Settings ESIE17-20A Display of setting items Display of setting conditions Setting item H1P H2P H3P H4P H5P H6P H7P LRMEQ3,4BY1 Outdoor unit fan INV compressor H1P H2P H3P H4P H5P H6P H7P Fan MAX low General Nmax noise = 7 low noise = 14 Fan MAX low General Nmax...
  • Page 35 ESIE17-20A Field Settings b-2. Setting mode 2 (for service) Display of setting items Display of setting conditions Setting item H1P H2P H3P H4P H5P H6P H7P (Unit: MPa) H1P H2P H3P H4P H5P H6P H7P (Factory setting) High pressure correction = 0 14 Correction of fan revolution High pressure correction = -0.2 k according to the high pressure...

  • Page 36: Description Of Functions And Operation

    Description of Functions and Operation ESIE17-20A 5. Description of Functions and Operation Operating Mode [Classification of operating modes] The table below lists all the operating modes available. <List of operating modes> Operating mode Compressor Stop Running (1) There are 2 operating modes available. (This includes a mode in which the system is stopped.) (2) The state in which all the compressors are stopped is operating mode 0.

  • Page 37: Outline Of Functions

    ESIE17-20A Description of Functions and Operation Outline of Functions (Input) (Output) Outdoor unit Low pressure sensor Startup control Compressor Thermostat ON/OFF Electronic expansion High pressure sensor valve Compressor control Discharge pipe thermistor Solenoid valve Outdoor unit fan control Outdoor unit fan motor Suction pipe thermistor Electronic expansion Double tube heat exchanger...

  • Page 38: Detailed Description Of Functions

    Description of Functions and Operation ESIE17-20A 5.2.1 Detailed Description of Functions (1) Startup control  The actuators will be operated in the following sequence when the thermostat is turned ON: 1. The outdoor unit fan will start to operate for 5 seconds. (This is intended to measure the outdoor air temperature accurately.) 2.
  • Page 39 ESIE17-20A Description of Functions and Operation (3) Compressor control Compressor control • Increase or decrease the compressor frequency using the low pressure as a controlled Normal capacity control variable, in order to achieve the optimum cooling capacity for the target evaporating temperature (Tst).
  • Page 40 Description of Functions and Operation ESIE17-20A (3)-1. Compressor steps table INV. INV. General compressor step step frequency (Hz) 3BY1 4BY1 Air Cooled Refrigeration Condensing Unit...
  • Page 41 ESIE17-20A Description of Functions and Operation (4) Fan control (4)-1. Outdoor unit fan control The outdoor unit fan will be controlled using the high pressure as the controlled variable, as shown in the flow below. Outdoor unit fan Fan control Lpm: Pressure equivalent to the target evaporating temperature HP: High pressure Every 20 to...
  • Page 42 Description of Functions and Operation ESIE17-20A (5) Electronic expansion valve control (5)-1. Outdoor electronic expansion valve (Y1E(EV1)) ······ This valve will provide refrigerant gas injection flow rate control, overheating protection, and condensation protection.  Initial valve opening: 43pls (mode 1), 55pls (modes other than mode 1) ...
  • Page 43 ESIE17-20A Description of Functions and Operation (7) Oil return control Recover the refrigeration oil that has been left standing in the system at regular intervals. Recover the oil into the outdoor unit, using a timer and low pressure. Oil return Oil return by turning ON/OFF Objective: Recovers the refrigeration oil from the evaporator by putting the refrigerant into a wet...
  • Page 44 Description of Functions and Operation ESIE17-20A (9) Overheat protection control  If any of the following conditions is met, the system will cease operation. INV. compressors will resume operation after 2 to 6 minutes in standby. If a particular compressor repeats this procedure 15 times, "...

  • Page 45: Test Operation

    ESIE17-20A Test Operation 6. Test Operation Refrigerant Piping [REFRIGERANT] This System use R-410A refrigerant. This unit is already filled with a certain amount of R-410A. Caution Never open liquid and gas stop valve until the step Specified in “6.4. CHECKS AFTER WORK COMPLETION”.

  • Page 46: To Piping Work Contractors

    Test Operation ESIE17-20A 6.1.1 To Piping Work Contractors  Never open the stop valve until the steps specified in “6.2 FIELD WIRING” and “6.3.3 Checking of device and installation conditions” of piping.  Do not use flux at the time of brazing and connecting refrigerant pipes. Use phosphorous copper brazing filler metal (BCuP-2), which does not require flux.

  • Page 47: Selection Of Piping Material

    ESIE17-20A Test Operation 6.1.2 Selection of Piping Material  Make sure that the inner side and outer side of the piping used is clean and free of contaminants, such as sulphur, oxide, dust, chips, oil and fat, and water. It is desirable that the maximum oil adhesion in the piping is 30 mg per 10 m. ...
  • Page 48 Test Operation ESIE17-20A <Piping between piping branching [B+C/b+c]> Use diameters depending on the total capacity of the indoor units connected downstream. Capacity Piping outer diameter Liquid piping <4.0kW Ø6.4mm 4.0≤x≤8.4kW Ø9.5mm Gas piping <1.0kW Ø9.5mm 1.0≤x≤6.0kW Ø12.7mm 6.0≤x≤8.4kW Ø15.9mm <Piping between piping branching and indoor unit [D~F/d~f]> Use the same diameters as the connections (liquid, gas) on the indoor units.

  • Page 49: Dryer Installation

    ESIE17-20A Test Operation 6.1.3 Dryer Installation This product requires that a dryer is installed on liquid piping on site. Caution (Operating the unit without a dryer installed may result in equipment failure.) Required dryer core Model (recommended type) 80g (100% molecular sieve equivalent) LRMEQ3, 4BY1 (DML083/DML083S: Danfoss made) ...
  • Page 50 Test Operation ESIE17-20A Tightening torque N•m (closes clockwise) Stop valve sizes Shaft (valve body) Valve cover Service port φ9.5 5.4~6.5 13.5~16.5 Hexagon wrench: φ12.7 8.1~9.9 18.0~22.0 φ19.1 Hexagon wrench: 11.5~13.9 27.0~33.0 22.5~27.5 φ25.4 Hexagon wrench: φ31.8 26.5~29.4 44.1~53.9 10mm Opening method 1.

  • Page 51: Precautions For Piping

    ESIE17-20A Test Operation 6.1.5 Precautions for Piping <Liquid piping branching>  Install liquid piping joints horizontally. This will prevent an uneven flow of refrigerant.  Install liquid piping headers downwards. a Joint for branching c Downward piping b Header <Gas piping branching> ...

  • Page 52: Field Wiring

     Specifications for local wiring are in compliance with IEC60245.  Use wire type H05VV when protected pipes are used.  Use wire type H07RN-F when protected pipes are not used. Phase and frequency Voltage Minimum circuit amp. Recommended fuses LRMEQ3BY1 φ3, 50Hz 380-415V 6.5A φ3, 50Hz LRMEQ4BY1 380-415V 9.1A...
  • Page 53 ESIE17-20A Test Operation Low noise switch wiring connections  When installing a remote operating switch to the X2M terminal block, clamp as indicated by the following diagram. X2M wire specifications Electric wire thickness 0.75~1.25mm Max. wiring length 130m d Low noise switch Remote operating switch wiring connections ...

  • Page 54: Inspection And Pipe Insulation

    Test Operation ESIE17-20A Inspection and Pipe Insulation For piping work contractor, electrical work contractor, and trial run workers  Never open the stop valve until the insulation measurement of the main power supply circuit is finished. The measured insulation value will become lower if the measurement is made with the stop valve opened.

  • Page 55: Thermal Insulation Work

    ESIE17-20A Test Operation  Conduct an air tight test and vacuum drying precisely through the service ports of both liquid Caution and gas stop valves.  Use charge hoses (provided with a pushing rod each) when using the service ports. 6.3.2 Thermal Insulation Work ...

  • Page 56: Checks After Work Completion

    Test Operation ESIE17-20A Checks after Work Completion  Make sure the following works are complete in accordance with the installation manual. • Piping work • Wiring work • Air tight test/Vacuum drying • Installation work for indoor unit Charging refrigerant 6.5.1 Precautions when charging refrigerant ...

  • Page 57: To Charge Refrigerant

    ESIE17-20A Test Operation Parameter C: When the sight glass shows shortage of refrigerant while test running, add refrigerant. Do not be over 25% of (1) By piping length + (2) By connecting showcase + (3) By connecting blower coils. Fine tuning ≤...
  • Page 58 Test Operation ESIE17-20A Checking the sight glass If the determined additional refrigerant amount is reached by the "Pre-charging refrigerant" instructions, continue as follows: 5. Open all outdoor unit stop valves. 6. Take all the precautions mentioned in “Checklist before commissioning” on page 59. 7.
  • Page 59 ESIE17-20A Test Operation 16. Turn on the power of the outdoor unit, but leave the operation switch turned off. 17. Set the target evaporating temperature with settings [2-0] and [2-1]. 18. Turn on the power of the indoor units. 19. Turn on the operation switch. Result: The unit will start operation.

  • Page 60: Precautions For Refrigerant Cylinder

    Test Operation ESIE17-20A 6.5.4 Precautions for refrigerant cylinder At the time of refrigerant filling, check whether the siphon tube is provided. Then locate the cylinder so that the refrigerant will be filled in the state of liquid (see table below). R-410A is a mixed refrigerant, the composition of which may change and the normal operation of the system may not be possible if the refrigerant is filled in the state of gas.

  • Page 61: Checklist Before Commissioning

    ESIE17-20A Test Operation In Europe, the greenhouse gas emissions of the total refrigerant charge in the system Caution (expressed as tonnes CO -equivalent) is used to determine the maintenance intervals. Follow the applicable legislation. Formula to calculate the greenhouse gas emissions: GWP value of the refrigerant × Total refrigerant charge [in kg] / 1000.

  • Page 62: Checklist During Commissioning

    Test Operation ESIE17-20A Checklist during commissioning  To perform a test run. 6.7.1 About test run Make sure to carry out the system test operation after the first installation. The procedure below describes the test operation of the complete system. 6.7.2 To perform a test run (7-LEDs display) 1.

  • Page 63: Operating The Unit

    ESIE17-20A Test Operation 6.7.4 Operating the unit Once the unit is installed and test operation of outdoor unit and indoor units is finished, the operation of the system can start. Air Cooled Refrigeration Condensing Unit...

  • Page 64: Troubleshooting

    Troubleshooting ESIE17-20A 7. Troubleshooting Checking Points at Servicing  Symptoms and check points Symptoms Check points Countermeasure and check details Temperature Is the outdoor unit running? Check the operation switch, signal line inside the R1·R2 and error display. showcase is at Is the sight glass liquid-sealed (in Charge refrigerant.
  • Page 65 ESIE17-20A Troubleshooting  Symptoms that are system malfunctions Malfunction Measure If the system does not operate at  Check if there is no power failure. Wait until power is restored. all. If power failure occurs during operation, the system automatically restarts immediately after the power supply is recovered.

  • Page 66: Error Codes: Overview

    Troubleshooting ESIE17-20A Error codes: Overview Code Cause Solution  The stop valve of an outdoor unit is left  Open the stop valve on both the gas and closed. liquid side.  Refrigerant overcharge.  Recalculate the required amount of refrigerant and correct the refrigerant charge level by recovering any excessive refrigerant with a refrigerant recovery...

  • Page 67: Checking Error Codes By Led Lamps On Pcb

    ESIE17-20A Troubleshooting Checking Error Codes by LED Lamps on PCB 1) Simple diagnosis by the LED error display In Setting Mode 1, the error status of each component can be checked by reading the blinking LED. Setting change procedure H1P H2P H3P H4P H5P H6P H7P Remarks Default display Press the MODE (BS1) button...
  • Page 68 Troubleshooting ESIE17-20A Setting Large item Middle item Small item Description Setting Mode 1, No. 1 Reversed phase H7P blinks when reversed phase is detected. System Setting Mode 1, No. 1 INV. earth leakage H6P blinks when INV. earth leakage is detected. Setting Mode 1, No.

  • Page 69: Checking Error Codes

    ESIE17-20A Troubleshooting Checking Error Codes 7.4.1 Condensing Unit Operate the BS buttons on the PCB and error codes will be displayed by LEDs. Setting Modes: 1-14, 15, 16, 20, 21, 22 Setting change procedure H1P H2P H3P H4P H5P H6P H7P Remarks Default display Press the MODE (BS1) button...
  • Page 70 Troubleshooting ESIE17-20A LED display Remote Page (Pressing the BS3 switch once) (Pressing the BS2 switch once) controller Error contents referred display H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P Inverter PCB abnormality P.97 Inverter radiation fin temperature rise P.98 INV.

  • Page 71: Troubleshooting By Ram Monitor

    ESIE17-20A Troubleshooting Troubleshooting by RAM Monitor Using the RAM monitor makes it possible to check the following operating data. Use this monitor for troubleshooting. SP_No. SP number Ver. Version of software (Used for updating the software for PCB) The comparison between HP_code and the model on the RAM Monitor Hp_code screen is as follows.
  • Page 72 Troubleshooting ESIE17-20A [Actuator] Mark of Mark of electric Mark on paragraph of wiring diagram Meaning RAM Monitor trouble repair chart 52ci INV. INV. compressor driven bits (OFF/ON: 0/1) Electronic expansion valve (Economizer) pulse (0~480) — — INV. step INV_Hz — —...
  • Page 73 ESIE17-20A Troubleshooting [Retry] Mark on RAM Monitor Error code Meaning Frequency of retrying of Abnormal Discharge pipe Temperature (system) Frequency of retrying of Abnormal Discharge pipe Temperature (INV.) Frequency of retrying of Actuation of High Pressure Sensor Frequency of retrying of Actuation of High HPSL Frequency of retrying of INV.

  • Page 74: Flow Chart For Troubleshooting

    Troubleshooting ESIE17-20A Flow Chart for Troubleshooting 7.6.1 Actuation of High Pressure Switch Error Code LRMEQ3~4BY1 Applicable Models Abnormality is detected when the contact of the high pressure protection switch opens. Method of Error Detection Error is generated when the HPS activation count reaches the number specific to the operation Error Decision mode.
  • Page 75 ESIE17-20A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for the points shown below. (1)Is the stop valve open? (2)Is the HPS connector properly connected to the outdoor unit inverter PCB? (3)Does the high pressure switch have continuity? Are the 3...

  • Page 76: Inverter Compressor Motor Lock

    Troubleshooting ESIE17-20A 7.6.2 Inverter Compressor Motor Lock Error Code LRMEQ3~4BY1 Applicable Models Inverter PCB takes the position signal from UVW line connected between the inverter and Method of Error compressor, and the error is detected when any abnormality is observed in the phase-current Detection waveform.
  • Page 77 ESIE17-20A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check if the stop Local factor valve is open. Open the stop valve. Check if the connection Ensure correct connection. of UVW phase order is correct.

  • Page 78: Outdoor Unit Fan Motor Abnormality

    Troubleshooting ESIE17-20A 7.6.3 Outdoor Unit Fan Motor Abnormality Error Code LRMEQ3~4BY1 Applicable Models While the fan motor is in operation, detect the error related to the fan motor according to Method of Error revolutions detected with the hall sensor IC. Detection ...
  • Page 79 ESIE17-20A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Has the voltage between L1 and N on the power supply terminal board Correct the power supply voltage. If L1 and N phases are open, X1M fallen within the range of 220 to 240V±10% (50 Hz)?

  • Page 80: Electronic Expansion Valve Coil Abnormality

    Troubleshooting ESIE17-20A 7.6.4 Electronic Expansion Valve Coil Abnormality Error Code LRMEQ3~4BY1 Applicable Models To be detected based on continuity existence of coil of electronic expansion valve (Y1E) Method of Error Detection No current is detected in the common (COM [+]) when power supply is ON. Error Decision Conditions ...
  • Page 81 ESIE17-20A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn power supply OFF, and turn power supply ON again. Return to normal? External factor other than error (for example, noise etc.).

  • Page 82: Abnormal Discharge Pipe Temperature

    Troubleshooting ESIE17-20A 7.6.5 Abnormal Discharge Pipe Temperature Error Code LRMEQ3~4BY1 Applicable Models Abnormality is detected according to the temperature detected by the discharge pipe Method of Error temperature sensor. Detection When the discharge pipe temperature rises to an abnormally high level. Error Decision Conditions Discharge pipe temp.
  • Page 83 ESIE17-20A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Connect the service checker. Press reset and start operation again. Is the refrigerant Recover the refrigerant. amount proper? Conduct vacuum drying, and then charge a proper amount of refrigerant.

  • Page 84: Wet Operation From Refrigeration Suction Pipe

    Troubleshooting ESIE17-20A 7.6.6 Wet Operation from Refrigeration Suction Pipe Error Code LRMEQ3~4BY1 Applicable Models Detect an error for discharge SH and suction SH of driving compressor Method of Error Detection These conditions continued 10 min. Error Decision Conditions Suction SH < 5K &...
  • Page 85 ESIE17-20A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Defective expansion valve, displaced temperature-sensitive pipe, Fix malfunction part or defective expansion valve selection of refrigeration side Defective solenoid valve operation of refrigeration Fix malfunction part...

  • Page 86: Wet Operation From Injection Pipe

    Troubleshooting ESIE17-20A 7.6.7 Wet Operation from Injection Pipe Error Code LRMEQ3~4BY1 Applicable Models Detect an error for discharge SH and suction SH of driving compressor Method of Error Detection These conditions continued 10 min. Error Decision Conditions Suction SH ≥ 5K &...

  • Page 87: 3-Sensor Abnormality

    ESIE17-20A Troubleshooting 7.6.8 3-sensor Abnormality Error Code LRMEQ3~4BY1 Applicable Models Error is detected from the values detected by pressure sensors and temperature sensors Method of Error (thermistors). Detection 3 or more out of the pressure sensors and the temperature sensors (thermistors) causes a Error Decision "Sensor error", respectively.
  • Page 88 Troubleshooting ESIE17-20A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. ∗3 or more sensors error. Check for the error history (error code) on the remote controller to identify three or more malfunctioning sensors.

  • Page 89: High Pressure Switch Abnormality

    ESIE17-20A Troubleshooting 7.6.9 High Pressure Switch Abnormality Error Code LRMEQ3~4BY1 Applicable Models Detect continuity in the high pressure switch in the protective device circuit. Method of Error Detection While the compressor stops running, there is no continuity in the high pressure switch. Error Decision Conditions ...

  • Page 90: Outdoor Unit Fan Motor Signal Abnormality

    Troubleshooting ESIE17-20A 7.6.10 Outdoor Unit Fan Motor Signal Abnormality Error Code LRMEQ3~4BY1 Applicable Models Detection of abnormal signal from fan motor. Method of Error Detection In case of detection of abnormal signal at starting fan motor. Error Decision Conditions  Abnormal fan motor signal (circuit error) Supposed ...
  • Page 91 ESIE17-20A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Cut the power supply OFF. Is the fan motor connector (X106A/ X107A) properly Ensure correct connection. connected to the fan inverter PCB? Check No.9 Check the connector of the...

  • Page 92: Outdoor Air Thermistor Abnormality

    Troubleshooting ESIE17-20A 7.6.11 Outdoor Air Thermistor Abnormality Error Code LRMEQ3~4BY1 Applicable Models Error is detected from the temperatures detected by the outdoor air thermistor. Method of Error Detection While in operation, the thermistor causes a broken wire or a short circuit in it. Error Decision Conditions ...

  • Page 93: Thermistor Abnormality

    ESIE17-20A Troubleshooting 7.6.12 Thermistor Abnormality Error Code LRMEQ3~4BY1 Applicable Models Error is detected from the temperatures detected by thermistors. Method of Error Detection While in operation, any of the thermistors causes a broken wire or a short circuit in it. Error Decision Conditions ...
  • Page 94 Troubleshooting ESIE17-20A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check for connector connection. (∗1) Is the resistance Properly connect it. normal? Disconnect the thermistor from the outdoor unit PCB, and then make resistance measurement using a multiple meter.

  • Page 95: High Pressure Sensor Abnormality

    ESIE17-20A Troubleshooting 7.6.13 High Pressure Sensor Abnormality Error Code LRMEQ3~4BY1 Applicable Models Error is detected from the pressure detected by the high pressure sensor. Method of Error Detection When the high pressure sensor is short circuit or open circuit. Error Decision (Not less than 4.3MPa, or 0.01MPa and below) Conditions ...
  • Page 96 Troubleshooting ESIE17-20A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. 1.Set the high pressure gauge. 2.Connect a RAM monitor. Are the characteristics of the high pressure sensor normal? (Make a Replace the high pressure sensor.

  • Page 97: Low Pressure Sensor Abnormality

    ESIE17-20A Troubleshooting 7.6.14 Low Pressure Sensor Abnormality Error Code LRMEQ3~4BY1 Applicable Models Error is detected from pressure detected by low pressure sensor. Method of Error Detection When the low pressure sensor is short circuit or open circuit. Error Decision (Not less than 1.8MPa, or -0.1MPa or less) Conditions ...
  • Page 98 Troubleshooting ESIE17-20A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Piping for different Correct the piping. circuit is erroneously connected. 1.Set the low pressure gauge. 2.Connect a RAM monitor. Are the characteristics of the low pressure sensor normal? (Make Replace the low pressure sensor.

  • Page 99: Inverter Pcb Abnormality

    ESIE17-20A Troubleshooting 7.6.15 Inverter PCB Abnormality Error Code LRMEQ3~4BY1 Applicable Models  Error is detected from the current values while waveform is outputted prior to the startup of Method of Error compressor. Detection  Error is detected from the values detected by the current sensor in synchronized operation at startup.

  • Page 100: Inverter Radiation Fin Temperature Rise

    Troubleshooting ESIE17-20A 7.6.16 Inverter Radiation Fin Temperature Rise Error Code LRMEQ3~4BY1 Applicable Models Fin temperature is detected by the thermistor of the radiation fin. Method of Error Detection When the temperature of the inverter radiation fin increases 90°C or more. Error Decision Conditions ...

  • Page 101: Inv. Compressor Instantaneous Overcurrent

    ESIE17-20A Troubleshooting 7.6.17 INV. Compressor Instantaneous Overcurrent Error Code LRMEQ3~4BY1 Applicable Models Error is detected from the currents flowing in the power transistor. Method of Error Detection An overcurrent (32.3A) flows even instantaneously. Error Decision Conditions  Defective compressor coil (e.g. broken wire or insulation failure) Supposed ...
  • Page 102 Troubleshooting ESIE17-20A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the stop Open the stop valve. valve open? Is the compressor lead Replace the compressor lead wire. wire normal? Are wirings and wire connections...

  • Page 103: Inv. Compressor Overload

    ESIE17-20A Troubleshooting 7.6.18 INV. Compressor Overload Error Code LRMEQ3~4BY1 Applicable Models Error is detected from the currents flowing in the power transistor. Method of Error Detection Currents on the secondary side of the inverter come to the following values. Error Decision (1) Not less than 16,5A for a period of consecutive 5 seconds Conditions (2) Not less than 13,6A for a period of consecutive 260 seconds...
  • Page 104 Troubleshooting ESIE17-20A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the stop Open the stop valve. valve open? Is the compressor lead Replace the compressor lead wire. wire normal? Are wirings and wire Correct the wirings and wire...

  • Page 105: Inv. Compressor Startup Abnormality

    ESIE17-20A Troubleshooting 7.6.19 INV. Compressor Startup Abnormality Error Code LRMEQ3~4BY1 Applicable Models Error is detected from the signal waveforms of the compressor. Method of Error Detection The compressor startup sequence is not complete. Error Decision Conditions  Failure to open the stop valve Supposed ...
  • Page 106 Troubleshooting ESIE17-20A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the first time for the compressor to start after installation? Is a proper amount Charge a proper amount of of refrigerant refrigerant.

  • Page 107: Transmission Error (Between Inverter Pcb And Outdoor Unit Main Pcb)

    ESIE17-20A Troubleshooting 7.6.20 Transmission Error (between Inverter PCB and Outdoor Unit Main PCB) Error Code LRMEQ3~4BY1 Applicable Models Check the communication state between the inverter PCB and the control PCB by micro- Method of Error computer. Detection When the correct communication is not conducted in certain period. Error Decision Conditions ...
  • Page 108 Troubleshooting ESIE17-20A Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the connector connecting between each control PCB and Properly connect the connector. each inverter PCB securely connected? (See ∗1) Is the type of the Replace with a proper PCB.

  • Page 109: Power Supply Voltage Imbalance

    Be sure to explain to the user that Give the user a copy of "notification of inspection results" and leave there is a "power supply imbalance" it up to him to improve the imbalance. for which DAIKIN is not responsible. Air Cooled Refrigeration Condensing Unit...

  • Page 110: Radiation Fin Thermistor Abnormality

    Troubleshooting ESIE17-20A 7.6.22 Radiation Fin Thermistor Abnormality Error Code LRMEQ3~4BY1 Applicable Models While the compressor stops running, detect the resistance of the radiation fin thermistor. Method of Error Detection The thermistor resistance comes to a value equivalent to an open or a short circuit. Error Decision Conditions ...

  • Page 111: Reverse Phase / Open Phase

    ESIE17-20A Troubleshooting 7.6.23 Reverse Phase / Open Phase Error Code LRMEQ3~4BY1 Applicable Models Make judgement by detecting the state of every phase in the reverse phase detection circuit. Method of Error Detection The power supply voltage has a reverse phase or the phase T is open. Error Decision Conditions ...

  • Page 112: Abnormal Power Supply Voltage

    Troubleshooting ESIE17-20A 7.6.24 Abnormal Power Supply Voltage Error Code LRMEQ3~4BY1 Applicable Models Detection of voltage of main circuit capacitor built in the inverter and power supply voltage. Method of Error Detection When the abnormal voltage of main circuit capacitor built in the inverter and abnormal power Error Decision supply voltage are detected.
  • Page 113 ESIE17-20A Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Have the power supply voltages between L1 and L2, L2 and L3, and L1 and L3 fallen within the range of 380 to Correct the power supply voltages.
  • Page 114 Troubleshooting ESIE17-20A CHECK 1 Check for Causes of Rise in High Pressure Referring to the Fault Tree Analysis (FTA) shown below, identify defective points. Closed stop valve ←Check to be sure that the stop valve is open. Partly rise High piping ←Visual check Bended or crushed pipe in pressure...
  • Page 115 ESIE17-20A Troubleshooting CHECK 2 Check for Causes of Dropping Low Pressure Referring to the Fault Tree Analysis (FTA) shown below, identify defective points. ←Are the voltage characteristics normal? Defective low pressure sensor (∗1) Defective compressor Defective ←Is the pressure value on the Service Checker Defective outdoor unit main PCB capacity low pressure...
  • Page 116 Troubleshooting ESIE17-20A CHECK 3 Check for Causes of Overheat Operation Referring to the Fault Tree Analysis (FTA) shown below, identify defective points. Defective valve coil ←Is the coil resistance and Defective the insulation normal? subcooling Defective valve body electronic Defective expansion discharge valve...
  • Page 117 ESIE17-20A Troubleshooting CHECK 4 Inverter board for compressor standard three phase Check the power semiconductors mounted on the inverter PCB by the use of a multiple tester. 1. Check the compressor windings: 1. Switch off the Outdoor Unit with the field supplied circuit breaker. 2.
  • Page 118 Troubleshooting ESIE17-20A Detail 2 Detail 1 Detail 1 Detail 2 The contacts on the INV board can be very difficult to reach. On below pictures you find a Note: suggestion of an other measuring point. Air Cooled Refrigeration Condensing Unit...
  • Page 119 ESIE17-20A Troubleshooting Air Cooled Refrigeration Condensing Unit...
  • Page 120 Troubleshooting ESIE17-20A CHECK 5 Check for Causes of Wet Operation Referring to the Fault Tree Analysis (FTA) shown below, identify defective points. Excessive compressor Refrigerant ON-OFF accumulation ←See Refrigerant overcharge CHECK 6 [In cooling] If the indoor unit mechanical Defective indoor expansion valve unit electronic excessively...
  • Page 121 ESIE17-20A Troubleshooting CHECK 6 Check for Refrigerant Amount Due to relationship to pressure control and electronic expansion valve control, the refrigerant amount needs to be judged according to operating conditions. Refer to information shown below for making judgements. Diagnosis of Refrigerant Overcharge 1.
  • Page 122 Troubleshooting ESIE17-20A CHECK 7 Vacuum Drying Procedure To conduct vacuum drying in the piping system, follow the procedure for <Normal vacuum drying> shown below. <Vacuum drying> 1. Vacuum drying • Use a vacuum pump that enables vacuuming to a vacuum level of -100.7kPa (5 torr, -755 mmHg).
  • Page 123 ESIE17-20A Troubleshooting CHECK 8 List of Error Codes Related to Inverter Code Name Condition for determining error Major defective point  Inverter getting caught in liquid INV. Compressor  Inverter output causes an overcurrent  Defective compressor Instantaneous Overcurrent to flow even instantaneously. ...
  • Page 124 Troubleshooting ESIE17-20A CHECK 9 Check for Fan Motor Connector (1) Turn the power supply off. (2) With the fan motor connector on motor side disconnected, measure the resistance between each pin, then make sure that the resistance is more than the value mentioned in the following table. 1 White 2 Orange 3 Brown...
  • Page 125 ESIE17-20A Troubleshooting CHECK 10 Temperature and Resistance Characteristics of Thermistor  Outdoor unit Heat exchanger Liquid Applicable Suction air Discharge pipe Radiation fin (Inlet and pipe outlet) Type ST0601N ST0601N ST0602N ST0901 DTN-C193H3T-DKK Temperature (°C) Resistance (kΩ) Resistance (kΩ) Resistance (kΩ) Resistance (kΩ) 112.0 10.9...
  • Page 126 Troubleshooting ESIE17-20A CHECK 11 Voltage Characteristics of Pressure Sensor PH = 1.38V –0.69 : Output voltage [High pressure side] V PL = 0.57V –0.28 : Output voltage [Low pressure side] V PH : High pressure (MPa) PL : Low pressure (MPa) Pressure detected (kg/cm 51.0 5.0...
  • Page 127 ESIE17-20A Troubleshooting Characteristics of Refrigerant and Psychrometric Chart Characteristics of Refrigerant R-410A Pressure MPa Air Cooled Refrigeration Condensing Unit...

  • Page 128: Maintenance

    Troubleshooting ESIE17-20A Maintenance 1. Procedure for Removal of Parts from Refrigerant System As the results of checking an error, if the error results from part(s) used in the refrigerant system, remove the part(s) referring to the procedure for refrigerant recovery shown below. Location of error Procedure for maintenance ...
  • Page 129 ESIE17-20A Troubleshooting 1) Maintenance 1: Maintenance related to outdoor unit compressor Applicable parts • Compressors (M1C) • High pressure switch 1 compressor No continuous operations allowed A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve b, c: Service ports 1.
  • Page 130 Troubleshooting ESIE17-20A 2) Maintenance 2: Maintenance of EV1 Applicable parts • Injection electronic expansion valve 1 compressor No continuous operations allowed A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve b, c: Service ports 1.
  • Page 131 ESIE17-20A Troubleshooting 3) Maintenance 3: Maintenance of showcase and dryer Applicable parts • Mechanical thermostatic expansion valve • Dryer 1~3 compressor No continuous operations allowed A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve a, b, c: Service ports 1.

  • Page 132: Appendix (Supplementary Information)

    Appendix (Supplementary Information) ESIE17-20A 8. Appendix (Supplementary Information) Restriction Matter of Showcase • The design pressure of the indoor unit must be 2.5MPa. • Install either a mechanical thermostatic expansion valve or an electronic expansion valve (proportional or pulse type) when installing a pulse type, make sure to protect the piping from pressure waves caused by the opening and closing of the valve.

  • Page 133: Precautions When Selecting A Thermal Expansion Valve

    ESIE17-20A Appendix (Supplementary Information) Precautions when Selecting a Thermal Expansion Valve The condensing unit cools liquid refrigerant with a double tube type heat exchanger, so the liquid refrigerant subcooling degree (subcooling degree = condensing temperature – liquid refrigerant temperature) is larger than small refrigerators with no subcooling mechanism.
  • Page 134 Appendix (Supplementary Information) ESIE17-20A Installation of alarm (Case example) Because the unit stopped abnormally, and the temperature in the storage had risen, goods preserved on the inside were deteriorated. (Cause) The abnormal stop occurred because of the problem of the unit, and they display the abnormal signal.

  • Page 135: Option List

    ESIE17-20A Appendix (Supplementary Information) Option List Series CONDENSING UNIT FOR REFRIGERATION SYSTEM Model LRMEQ3, 4BY1 Option name Communication box BRR9A1V1 Configurator EKPCCAB Pressure gauge kit BHGP26A1 Air Cooled Refrigeration Condensing Unit...
  • Page 136 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion.  Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorised parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

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