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Daikin LRLEQ5AY1(E) Service Manual

Air cooled refrigeration condensing unit
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Service
Manual
Air Cooled Refrigeration
Condensing Unit
LRLEQ5AY1(E)
LRLEQ6AY1(E)
LRLEQ8AY1(E)
LRLEQ10AY1(E)
LRLEQ12AY1(E)
LRLEQ15AY1(E)
LRLEQ20AY1(E)
LRMEQ5AY1(E)
LRMEQ6AY1(E)
LRMEQ8AY1(E)
LRMEQ10AY1(E)
LRMEQ12AY1(E)
LRMEQ15AY1(E)
LRMEQ20AY1(E)
SiENBE28-901

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Summary of Contents for Daikin LRLEQ5AY1(E)

  • Page 1 SiENBE28-901 Service Manual Air Cooled Refrigeration Condensing Unit LRLEQ5AY1(E) LRMEQ5AY1(E) LRLEQ6AY1(E) LRMEQ6AY1(E) LRLEQ8AY1(E) LRMEQ8AY1(E) LRLEQ10AY1(E) LRMEQ10AY1(E) LRLEQ12AY1(E) LRMEQ12AY1(E) LRLEQ15AY1(E) LRMEQ15AY1(E) LRLEQ20AY1(E) LRMEQ20AY1(E)

  • Page 2: Table Of Contents

    SiENBE28-901 Air Cooled Refrigeration Condensing Unit LRMEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1 LRLEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1 Air Cooled Refrigeration Condensing Unit 1 LRMEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1 1 LRLEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1 1 1.

  • Page 3: Introduction

    Introduction SiENBE28-901 1. Introduction Safety Precautions Before performing design, construction, or maintenance, thoroughly read the "Safety Precautions" and also the "Installation Manual" and "Operation Manual" 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 4 SiENBE28-901 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 5 Introduction SiENBE28-901 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 6 SiENBE28-901 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 7 Introduction SiENBE28-901 Air Cooled Refrigeration Condensing Unit Nomenclature Outdoor unit Power supply symbol Y1: 3φ 380-415V, 50Hz Indicates major design category Capacity indication 5: 5HP Refrigerant Q: R-410A Compressor type E: Intermediate INJ type Temperature zone to be used M: Medium temperature (MT) L: Low temperature (LT) Product category L: Low temperature air conditioner...

  • Page 8: Standard Specification

    SiENBE28-901 Standard Specification 2. Standard Specification Standard Specification LRMEQ5AY1 LRMEQ6AY1 Model [LRMEQ5AY1E] [LRMEQ6AY1E] Power Supply 3 phase 50Hz 380-415V Capacity 12.2 14.4 Range of Suction Pressure Equivalent °C -20~+10 Saturation Temperature Range of Outdoor Temperature °C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H×W×D) 1680×635×765 Heat Exchanger...
  • Page 9 Standard Specification SiENBE28-901 LRMEQ8AY1 LRMEQ10AY1 LRMEQ12AY1 Model [LRMEQ8AY1E] [LRMEQ10AY1E] [LRMEQ12AY1E] Power Supply 3 phase 50Hz 380-415V Capacity 18.6 21.8 24.4 Range of Suction Pressure Equivalent °C -20~+10 Saturation Temperature Range of Outdoor Temperature °C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H×W×D) 1680×930×765 Heat Exchanger...
  • Page 10 SiENBE28-901 Standard Specification LRMEQ15AY1 LRMEQ20AY1 Model [LRMEQ15AY1E] [LRMEQ20AY1E] Power Supply 3 phase 50Hz 380-415V Capacity 32.2 37.0 Range of Suction Pressure Equivalent °C -20~+10 Saturation Temperature Range of Outdoor Temperature °C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H×W×D) 1680×1240×765 Heat Exchanger...
  • Page 11 Standard Specification SiENBE28-901 LRLEQ5AY1 LRLEQ6AY1 Model [LRLEQ5AY1E] [LRLEQ6AY1E] Power Supply 3 phase 50Hz 380-415V Capacity Range of Suction Pressure Equivalent °C -45~-20 Saturation Temperature Range of Outdoor Temperature °C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H×W×D) 1680×635×765 Heat Exchanger Cross fin coil...
  • Page 12 SiENBE28-901 Standard Specification LRLEQ8AY1 LRLEQ10AY1 LRLEQ12AY1 Model [LRLEQ8AY1E] [LRLEQ10AY1E] [LRLEQ12AY1E] Power Supply 3 phase 50Hz 380-415V Capacity 10.3 Range of Suction Pressure Equivalent °C -45~-20 Saturation Temperature Range of Outdoor Temperature °C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H×W×D) 1680×930×765 Heat Exchanger...
  • Page 13 Standard Specification SiENBE28-901 LRLEQ15AY1 LRLEQ20AY1 Model [LRLEQ15AY1E] [LRLEQ20AY1E] Power Supply 3 phase 50Hz 380-415V Capacity 13.6 15.1 Range of Suction Pressure Equivalent °C -45~-20 Saturation Temperature Range of Outdoor Temperature °C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H×W×D) 1680×1240×765 Heat Exchanger...

  • Page 14: Set Values For Functional Components And Protection Devices

    SiENBE28-901 Standard Specification Set Values for Functional Components and Protection Devices LRMEQ5AY1,6AY1 LRMEQ8AY1,10AY1,12AY1 LRMEQ15AY1,20AY1 Component Electric symbol LRLEQ5AY1,6AY1 LRLEQ8AY1,10AY1,12AY1 LRLEQ15AY1,20AY1 Type JT1GFDKTNYR@SB Inverter Overcurrent protection device 14.7A Type — JT17GFKTNYE@SB Compressor STD1 Overcurrent protection device — Type — — JT17GFKTNYE@SB STD2 Overcurrent protection device —...

  • Page 15: Operation Limits

    Standard Specification SiENBE28-901 Operation Limits LRLEQ5, 6, 8, 10, 12, 15, 20AY1(E) -45 -40 -35 -30 -25 -20 -15 30 35 40 Evaporating temperature (°C) 4D064913 LRMEQ5, 6, 8, 10, 12, 15, 20AY1(E) -20 -15 30 35 40 Evaporating temperature (°C) 4D064914 NOTES ∗1.

  • Page 16: Wiring Diagram

    SiENBE28-901 Standard Specification Wiring Diagram LRLEQ5A, 6AY1(E) LRMEQ5A, 6AY1(E) Air Cooled Refrigeration Condensing Unit...
  • Page 17 Standard Specification SiENBE28-901 LRLEQ8A, 10A, 12AY1(E) LRMEQ8A, 10A, 12AY1(E) Air Cooled Refrigeration Condensing Unit...
  • Page 18 SiENBE28-901 Standard Specification LRLEQ15A, 20AY1(E) LRMEQ15A, 20AY1(E) Air Cooled Refrigeration Condensing Unit...

  • Page 19: Piping Diagram

    Standard Specification SiENBE28-901 Piping Diagram LRLEQ5A, 6AY1(E) LRMEQ5A, 6AY1(E) FILTER CHECK VALVE CHECK VALVE DOUBLE PIPE HEAT EXCHANGER FUSIBLE PLUG CHECK VALVE PRESSURE REGULATING VALVE ELECTRONIC SERVICE PORT EXPANSION VALVE FILTER CHECK VALVE SIGHT GLASS ELECTRONIC EXPANSION HEAT EXCHANGER VALVE STOP VALVE FOUR WAY VALVE SERVICE PORT...
  • Page 20 SiENBE28-901 Standard Specification LRLEQ8A, 10A, 12AY1(E) LRMEQ8A, 10A, 12AY1(E) FILTER CHECK VALVE FUSIBLE PLUG CHECK VALVE PRESSURE REGULATING ELECTRONIC VALVE EXPANSION VALVE SERVICE PORT PLATE TYPE HEAT EXCHANGER FILTER CHECK VALVE SIGHT GLASS ELECTRONIC EXPANSION HEAT EXCHANGER VALVE STOP VALVE FOUR WAY VALVE SERVICE PORT STOP VALVE...
  • Page 21 Standard Specification SiENBE28-901 LRLEQ15A, 20AY1(E) LRMEQ15A, 20AY1(E) FILTER CHECK VALVE FUSIBLE PLUG CHECK VALVE PRESSURE REGULATING ELECTRONIC VALVE EXPANSION VALVE SERVICE PORT PLATE TYPE HEAT EXCHANGER FILTER CHECK VALVE SIGHT GLASS ELECTRONIC EXPANSION HEAT EXCHANGER VALVE STOP VALVE FOUR WAY VALVE SERVICE PORT STOP VALVE GAUGE PORT...

  • Page 22: Description And Layout Of Functional Parts And Piping Diagram

    SiENBE28-901 Standard Specification Description and Layout of Functional Parts and Piping Diagram LRMEQ5, 6AY1 LRLEQ5, 6AY1 Name Symbol Function An inverter-driven compressor, which runs at operating frequencies in the Inverter compressor (INV) range of 52Hz to 218Hz. Fan motor Used to operate a fan for heat exchange through an air heat exchanger. Electronic expansion valve Not used.
  • Page 23 Standard Specification SiENBE28-901 LRMEQ5, 6AY1 LRLEQ5, 6AY1 FILTER CHECK VALVE (12) DOUBLE PIPE FUSIBLE HEAT EXCHANGER (10) PLUG CHECK VALVE PRESSURE (19) REGULATING VALVE (16) (11) ELECTRONIC SERVICE PORT EXPANSION VALVE FILTER (20) CHECK VALVE SIGHT GLASS ELECTRONIC EXPANSION HEAT EXCHANGER VALVE STOP VALVE FOUR WAY VALVE...
  • Page 24 SiENBE28-901 Standard Specification LRMEQ5, 6AY1 LRLEQ5, 6AY1 R31T 2 M1F S1NPH S1NPL Y2E 4 S4PH S1PH 1 M1C Air Cooled Refrigeration Condensing Unit...
  • Page 25 Standard Specification SiENBE28-901 LRMEQ8, 10, 12AY1 LRLEQ8, 10, 12AY1 Name Symbol Function An inverter-driven compressor, which runs at operating frequencies in the Inverter compressor (INV) range of 52Hz to 232Hz. Standard compressor (STD) A compressor, which runs with commercial power supply. Fan motor Used to operate a fan for heat exchange through an air heat exchanger.
  • Page 26 SiENBE28-901 Standard Specification LRMEQ8, 10, 12AY1 LRLEQ8, 10, 12AY1 FILTER CHECK VALVE (14) FUSIBLE (15) PLUG (23) CHECK VALVE PRESSURE REGULATING ELECTRONIC VALVE EXPANSION (20) VALVE SERVICE PORT PLATE TYPE HEAT (16) EXCHANGER FILTER CHECK VALVE (24) SIGHT GLASS ELECTRONIC EXPANSION HEAT EXCHANGER VALVE...
  • Page 27 Standard Specification SiENBE28-901 LRMEQ8, 10, 12AY1 LRLEQ8, 10, 12AY1 Y3E Y2S 23 14 22 D R32T C R31T 3 M1F S1NPH 10 S1NPL S4PH Y1E 4 S1PH 12 S2PH R6T G R3T E Air Cooled Refrigeration Condensing Unit...
  • Page 28 SiENBE28-901 Standard Specification LRMEQ15, 20AY1 LRLEQ15, 20AY1 Name Symbol Function An inverter-driven compressor, which runs at operating frequencies in the Inverter compressor (INV) range of 52Hz to 232Hz. Standard compressor (STD 1) A compressor, which runs with commercial power supply. Standard compressor (STD 2) Fan motor Used to operate a fan on the right for heat exchange through an air heat exchanger.
  • Page 29 Standard Specification SiENBE28-901 LRMEQ15, 20AY1 LRLEQ15, 20AY1 FILTER CHECK VALVE FUSIBLE PLUG CHECK VALVE PRESSURE (18) (27) REGULATING ELECTRONIC VALVE EXPANSION (24) (19) VALVE SERVICE PORT PLATE TYPE HEAT (20) EXCHANGER FILTER (28) CHECK VALVE SIGHT GLASS ELECTRONIC EXPANSION HEAT EXCHANGER VALVE (21) STOP VALVE...
  • Page 30 SiENBE28-901 Standard Specification LRMEQ15, 20AY1 LRLEQ15, 20AY1 Y3E Y2S Y2S Y5S R33T S1PH D R32T C R31T 13 S1NPL 12 S1NPH B R2T S4PH 16 S3PH 15 S2PH R3T F R6T H Air Cooled Refrigeration Condensing Unit...

  • Page 31: Field Settings

    Field Settings SiENBE28-901 3. Field Settings Field Setting From Outdoor Unit The target evaporation temperature can be calculated as follows: Tst : Target evaporation temperature Tsd : Evaporation temperature set by dip switches ΔTsp : Temperature correction setting by pushbuttons. ΔTsn : Temperature correction setting during night-time operation Tst = Tsd + ΔTsp + ΔTsn The evaporation temperature can be set by dip switches and pushbuttons on the outdoor unit...
  • Page 32 SiENBE28-901 Field Settings LRMEQ** LRLEQ** LRMEQ** LRLEQ** -10°C -35°C 0°C -25°C (0.47MPa) (0.11MPa) (0.69MPa) (0.22MPa) 1 2 3 4 1 2 3 4 1 2 3 4 Factory set Factory set -20°C -45°C 5°C -20°C (0.29MPa) (0.03MPa) (0.82MPa) (0.29MPa) 1 2 3 4 -15°C -40°C 10°C...
  • Page 33 Field Settings SiENBE28-901 Setting at replacement by spare PCB Caution DIP switch setting after changing the main PCB to spare parts PCB In case of repair using this part, replace the part according to the following instruction. Make the following capacity and refrigeration / freezing settings subject to application models. Cut the power supply of the outdoor unit once and switch it on again after setting the switch of subject.
  • Page 34 SiENBE28-901 Field Settings Refrigerator: LRMEQ5~20AY1 (E) Factory Set ( the position of a switch) EB**** DS1DS2 Applicable model Setting method ( the position of switches) LRMEQ5AY1 (E) Set DS2-2 to ON 1 2 3 4 1 2 3 4 LRMEQ6AY1 (E) Set DS2-1 to ON 1 2 3 4 1 2 3 4...
  • Page 35 Field Settings SiENBE28-901 (2) Setting in service mode Using pushbuttons on the Main PCB (A1P) enables a variety of settings shown below. MODE RETURN RESET The following 4 modes are available. a. Setting mode 1 ..Initial state (while in normal operation): Used to make setting of the method of "Cool/Heat (H1P: OFF) selection".
  • Page 36 SiENBE28-901 Field Settings LED display when power is on H2P blinks for the first five seconds when the power supply is turned on. If the equipment is normal, H2P will be turned off in five seconds. H2P lights for abnormality. : ON : OFF : BLINK...
  • Page 37 Field Settings SiENBE28-901 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 0K (Factory set) -1°C -2°C -3°C ΔTsp: Fine-tuning setting of -4°C evaporation temperature ΔTsp...
  • Page 38 SiENBE28-901 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 5A 6A 8A 10A 12A 15A 20A H1P H2P H3P H4P H5P H6P H7P 15 21 34 39 42 58 62 k h h h h h h 14 18 38 36 38 62 58 k h h h h h k k h h h h k h...
  • Page 39 Field Settings SiENBE28-901 d. Setting method with the AIRNET or type-III checker. 1) In case of the AIRNET • Use Setting Mode 2-6 (AIRNET address). • Use Setting Mode 2-16 (virtual indoor unit address). 2) In case of a Type-III checker •...
  • Page 40 SiENBE28-901 Field Settings 3.1.1 Evaporation temperature correction at night-time, using an external contact The two methods can be used to increase the evaporation temperature at night-time below: 1. Receiving the time setting from the AIRNET (Setting Mode 2-8·9). 2. Using an external contact. The following describes the wiring needed to use an external contact.

  • Page 41: Description Of Functions And Operation

    Description of Functions and Operation SiENBE28-901 4. Description of Functions and Operation Operating Mode [Classification of operating modes] The table below lists all the operating modes available. <List of operating modes> Cooling operation Compressor (Operating Mode) (1 compressor) (2 compressors) (3 compressors) INV+STD1 INV+STD1+STD2 INV+STD2...
  • Page 42 SiENBE28-901 Description of Functions and Operation 1) Operation Mode 1 <In case of 1 compressor> HPSL HPS1 <In case of 2 compressors> HPSL HPS1 HPS2 STD1 Air Cooled Refrigeration Condensing Unit...
  • Page 43 Description of Functions and Operation SiENBE28-901 <In case of 3 compressors> HPSL HPS1 HPS2 HPS3 STD1 STD2 Air Cooled Refrigeration Condensing Unit...
  • Page 44 SiENBE28-901 Description of Functions and Operation 2) Operation Mode 2 <In case of 2 compressors> HPSL HPS1 HPS2 STD1 <In case of 3 compressors> HPSL HPS1 HPS2 HPS3 STD1 STD2 Air Cooled Refrigeration Condensing Unit...
  • Page 45 Description of Functions and Operation SiENBE28-901 3) Operation Mode 3 <In case of 3 compressors> HPSL HPS1 HPS2 HPS3 STD1 STD2 4) Operation Mode 4 <In case of 3 compressors> HPSL HPS1 HPS2 HPS3 STD1 STD2 Air Cooled Refrigeration Condensing Unit...
  • Page 46 SiENBE28-901 Description of Functions and Operation 5) Operation Mode 5 (Defective of INV) <In case of 2 compressors> HPSL HPS1 HPS2 STD1 <In case of 3 compressors> HPSL HPS1 HPS2 HPS3 STD1 STD2 Air Cooled Refrigeration Condensing Unit...
  • Page 47 Description of Functions and Operation SiENBE28-901 6) Operation Mode 6 (Defective of INV) <In case of 3 compressors> HPSL HPS1 HPS2 HPS3 STD1 STD2 7) Operation Mode 7 (Defective of INV) <In case of 3 compressors> HPSL HPS1 HPS2 HPS3 STD1 STD2 Air Cooled Refrigeration Condensing Unit...

  • Page 48: Outline Of Functions

    SiENBE28-901 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 fan control Outdoor fan motor Suction pipe thermistor Electronic expansion Brazed-plate type heat exchanger...

  • Page 49: Detailed Description Of Functions

    Description of Functions and Operation SiENBE28-901 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 fan will start to operate for 5 seconds. (This is intended to measure the outdoor temperature accurately.) 2 At power-up, the operation outputs (P1, P2) for low pressure conditions (see the chart on the right) will be turned on/off.
  • Page 50 SiENBE28-901 Description of Functions and Operation Conversion table for using the evaporation temperature (set by the dip switches) to determine its pressure equivalent Tsd(Lpm1) Tsd(Lpm1) LRMEQ** LRLEQ** LRMEQ** LRLEQ** -10°C -35°C 0°C -25°C (0.47MPa) (0.11MPa) (0.69MPa) (0.22MPa) 1 2 3 4 1 2 3 4 Factory set -20°C...

  • Page 51: Compressor Control

    Description of Functions and Operation SiENBE28-901 (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 evaporation temperature (Tst).
  • Page 52 SiENBE28-901 Description of Functions and Operation (3)-1. Compressor steps table INV compressor INV compressor General General frequency (Hz) + General frequency (Hz) + compressor step step step step the number of step step the number of frequency (Hz) STD compressors STD compressors 52+STD×1 52+STD×2...
  • Page 53 Description of Functions and Operation SiENBE28-901 (4) Fan control (4)-1. Outdoor fan control The outdoor fan will be controlled using the high pressure as the controlled variable, as shown in the flow below. Outdoor fan Fan control Lpm: Pressure equivalent to the target evaporation temperature Every 20 to HP: High pressure 60 seconds...
  • Page 54 SiENBE28-901 Description of Functions and Operation (4)-5. Outdoor fan tap table LRM(L)EQ5AY1 Fan (Fan tap) Outdoor fan (standard mode) Revolution (rpm) Fan (Fan tap) Outdoor fan (high static pressure mode) 1000 1020 Revolution (rpm) LRM(L)EQ6AY1 Fan (Fan tap) Outdoor fan (standard mode) 1000 1020 Revolution (rpm) Fan (Fan tap)
  • Page 55 Description of Functions and Operation SiENBE28-901 (5) Electrical expansion valve control (5)-1. Outdoor electrical expansion valve (Y1E(EV1)) ······ This only applies to the Japanese domestic models. The valve will be activated when the reverse cycle defrost is used. For the LRM(L)EQ** models, a "0pls" command will be used all times. (5)-2.
  • Page 56 SiENBE28-901 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. Objective: Oil return Oil return by turning on/off the Recovers the refrigeration oil from the evaporator by putting the refrigerant into a wet control...
  • Page 57 Description of Functions and Operation SiENBE28-901 (10) Low pressure protection control If the pressure drops below 0.00 MPa, the system will cease operation. After 2 to 10 minutes in standby, the system will resume operation. For a period of 3 hours after power-up, the system will continue to check whether the suction stop valve is closed.

  • Page 58: Test Operation

    SiENBE28-901 Test Operation 5. Test Operation Refrigerant Piping [REFRIGERANT] This System use R410A refrigerant. Caution This unit is already filled with a certain amount of R410A. Never open liquid and gas shutoff valve until the step Specified in “5.4. CHECKS AFTER WORK COMPLETION”.
  • Page 59 Test Operation SiENBE28-901 5.1.1 To Piping Work Contractors Never open the shutoff valve until the steps specified in “5.2 FIELD WIRING” and “5.3.3 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 60 SiENBE28-901 Test Operation 5.1.2 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. Use the following type of refrigerant piping.
  • Page 61 Test Operation SiENBE28-901 5.1.3 Drier Installation Caution This product requires that a drier be installed on liquid piping on site. (Operating the unit without a drier installed may result in equipment failure.) Select a drier from the following chart: Required dryer core Model (recommended type) LRMEQ5AY1, LRLEQ5AY1...
  • Page 62 SiENBE28-901 Test Operation Tightening torque N•m (closes clockwise) Shutoff 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 63 Test Operation SiENBE28-901 5.1.5 Precautions for Piping Perform piping branching with the following conditions kept in mind. At the time of branching the liquid piping, use a T-joint or Y-joint and branch it horizontally. This will prevent an uneven flow of refrigerant. At the time of branching gas piping, use a T-joint and branch it so that the branched piping will be located above the main piping (see the illustration below).

  • Page 64: Field Wiring

    SiENBE28-901 Test Operation Field Wiring 5.2.1 Procedure for Power Supply Wiring Procedure for Power Supply Wiring 1 Power supply (3φ 380~415) 2 Branch switch or overcurrent circuit breaker (earth leakage circuit breaker) 3 Earth wire 4 Power supply terminal block 5 Mount insulation sleeves 6 Fix the power supply wiring for phases L1, L2, L3, and N, respectively, with the provided clamp (1) to...
  • Page 65 Test Operation SiENBE28-901 Point for attention regarding quality of the public electric power supply This equipment complies with respectively: EN/IEC61000-3-11 provided that the system impedance Z is less than or equal to Z EN/IEC61000-3-12 provided that the short-circuit power S is greater than or equal to the minimum S value...
  • Page 66 SiENBE28-901 Test Operation Remote operating switch wiring connections When installing a remote operating switch, clamp as indicated by the following diagram: Secure remote operating switch wiring to the resin block using a clamp (field supply). X3M wire specifications Electric wire thickness 0.75~1.25mm Max.

  • Page 67: Inspection And Pipe Insulation

    Test Operation SiENBE28-901 Inspection and Pipe Insulation For piping work contractor, electrical work contractor, and trial run workers Never open the shutoff 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 shutoff valve opened.
  • Page 68 SiENBE28-901 Test Operation Shutoff valve Gas side shutoff valve service port Pressure-reducing valve Liquid side Charge shutoff valve hose R410A Valve Outdoor unit To indoor unit Vacuum pump Meter Used for refrigerant replenishment Note: Field pipings Connection procedure for gauge manifold and vacuum pump Caution Conduct an airtight test and vacuum drying precisely through the service ports of both liquid...
  • Page 69 Test Operation SiENBE28-901 Liquid side shutoff valve Gas side shutoff valve Coking, etc. Indoor/Outdoor interunit piping Insulation material Piping lead-out hole lid Block Liquid side piping Open a knock hole at Gas side piping Note: After knocking out the holes, we recommend you remove burrs in the knock holes and paint the edges and areas around the edges using the repair paint.

  • Page 70: Checks After Work Completion

    SiENBE28-901 Test Operation 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 Additional Refrigerant Charge For refrigerant filling contractor Use R410A for refrigerant replenishment.
  • Page 71 Test Operation SiENBE28-901 [Additional Refrigerant Charge] Caution Refer to the Operation Method of Shutoff Valves for the control method of the shutoff valves. Never charge liquid refrigerant directly from a gas line. Liquid compression may cause the compressor to fail. 1.

  • Page 72: Test Run

    SiENBE28-901 Test Operation [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). R410A 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 73 Test Operation SiENBE28-901 Error diagnosis If the system cannot operate normal at the time of test run (i.e., the H2P indicator is lit), check with malfunction code on the system with the pushbutton switches on the PCB of the outdoor unit, and take the following steps. Make checks on other malfunction codes and pushbutton switches by referring to the provided Technical Guide.

  • Page 74: Troubleshooting

    SiENBE28-901 Troubleshooting 6. 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 malfunction display. showcase is at Is the sight glass liquid-sealed (in Charge refrigerant.
  • Page 75 Troubleshooting SiENBE28-901 1. Guideline for right operating conditions. Item Measuring method Right range Measure with a service checker or High pressure pressure gauge in a stable state 20 2.1 - 2.7 MPa (MPa) minutes or more after starting operation. Measure with a service checker or Low pressure pressure gauge in a stable state 20 0.0 MPa to target LPm + 0.05 MPa...
  • Page 76 SiENBE28-901 Troubleshooting 2-2. Procedures to be taken after beginning emergency operation until compressor replacement is complete and normal operation resumes 1.Change the outdoor unit operation switch from "LOCAL" or "REMOTE" to "OFF". 2.Turn off the outdoor unit's main breaker. 3.Replace the defective compressor with a new one. 4.Turn the outdoor unit breaker back on.

  • Page 77: List Of Malfunction Codes

    Troubleshooting SiENBE28-901 List of Malfunction Codes LRMEQ5, 6AY1 LRMEQ8, 10, 12AY1 LRMEQ15, 20AY1 Code LRLEQ5, 6AY1 LRLEQ8, 10, 12AY1 LRLEQ15, 20AY1 Times (Remote Detection Item Criteria Remarks Mal- Output Mal- Output Mal- Output control device retry Level function during Level function during Level...

  • Page 78: Checking Malfunction Codes By Led Lamps On Pcb

    SiENBE28-901 Troubleshooting Checking Malfunction Codes by LED Lamps on PCB 1) Simple diagnosis by the LED error display In Setting Mode 1-11, the error status of each component can be checked by reading the blinking LED. [Steps] Operate the pushbuttons on the PCB (in Setting Mode 1) and malfunction codes will be displayed by LEDs.
  • Page 79 Troubleshooting SiENBE28-901 2) In Setting Modes 1-14 and on, it is possible to use the LED to check the error and retry details, using the same steps as previously described (see the next page). MODE RETURN TEST RESET Setting Large item Middle item Small item Description...

  • Page 80: Checking Malfunction Codes Of The Condensing Unit

    SiENBE28-901 Troubleshooting Checking Malfunction Codes of the Condensing Unit Operate the pushbuttons on the PCB and malfunction codes will be displayed by LEDs. Setting Modes: 1-14, 15, 16, 20, 21, 22 [Steps] 1. Make sure that the "H1P" LED is OFF. (If the LED is ON, press the MODE button (BS1) once.) 2.

  • Page 81: Troubleshooting By Ram Monitor

    Troubleshooting SiENBE28-901 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 82 SiENBE28-901 Troubleshooting [Sensor] Mark of Mark of electric Mark on paragraph of wiring diagram Meaning RAM Monitor trouble repair chart Ambient temperature thermistor R31T Discharge temperature thermistor (INV Comp) R32T Discharge temperature thermistor (STD1) R33T Discharge temperature thermistor (STD2) Suction temperature thermistor Outdoor heat exchanger outlet thermistor Subcool heat exchanger outlet thermistor Subcool heat exchanger inlet thermistor...
  • Page 83 Troubleshooting SiENBE28-901 [Data] Mark on RAM Monitor Meaning (Calculation value from sensor) Suction super heat TdSH1 Discharge super heat(INV) TdSH2 Discharge super heat(STD1) TdSH3 Discharge super heat(STD1) Target evaporation temperature equivalent pressure (Lpm is saturation temperature equivalent pressure of Tst. Δ...
  • Page 84 SiENBE28-901 Troubleshooting [Retry] Mark on RAM Monitor Error code Meaning Frequency of retrying of Abnormal Discharge Temperature(system) Frequency of retrying of Abnormal Discharge Temperature(INV) Frequency of retrying of Abnormal Discharge Temperature(STD1) Frequency of retrying of Abnormal Discharge Temperature(STD2) Frequency of retrying of Actuation of High Pressure Sensor Frequency of retrying of Actuation of High Pressure Sensor Frequency of retrying of Actuation of High HPSL Frequency of retrying of STD1 Compressor Motor...

  • Page 85: Flow Chart For Troubleshooting

    Troubleshooting SiENBE28-901 Flow Chart for Troubleshooting 6.6.1 “ ” STD Compressor Motor Overcurrent/Lock Remote Controller Display Applicable LRMEQ8~20AY1 LRLEQ8~20AY1 Models Method of Detects the overcurrent with current sensor (CT). Malfunction Detection Malfunction Malfunction is decided when the detected current value exceeds 14.95A for 2 seconds. Decision Conditions Supposed...
  • Page 86 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the stop valve open? Open the stop valve. Obstacle exists Remove the obstacle. around the air outlet. Is the power Correct the power voltage.
  • Page 87 Troubleshooting SiENBE28-901 6.6.2 “ ” Earth Leakage Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of When there is a earth leakage (breaker ON/OFF) Time elapsed after power-on Malfunction Detection When there is a earth leakage (leakage detector PCB) The continuity of the high pressure switch is checked using the protective device circuit. Malfunction When there is a earth leakage (breaker ON/OFF) Decision...
  • Page 88 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. More than 10 Reset the power with the seconds passed operation switch set to OFF. since power-on Earth leakage (breaker ON/ OFF): E2 Shut off power.
  • Page 89 Troubleshooting SiENBE28-901 6.6.3 “ ” Actuation of High Pressure Switch Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of The protection device circuit checks continuity in the high pressure switch. Malfunction Detection Malfunction Error is generated when the HPS activation count reaches the number specific to the operation Decision mode.
  • Page 90 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check for the points shown below. (1)Is the stop valve open? (2)Is the HPS connector properly connected to the main PCB? (3)Does the high pressure switch have continuity? Are the three...
  • Page 91 Troubleshooting SiENBE28-901 6.6.4 “ ” Actuation of Low Pressure Sensor Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Abnormality is detected by the pressure value with the low pressure sensor. Malfunction Detection Malfunction Error is generated when the low pressure is dropped under compressor operation. Decision Low pressure <0.00MPa Detected within 3 hours after power-on...
  • Page 92 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the stop Open the stop valve. valve open? (1)Mount a pressure gauge on the low pressure service port. (2)Reset the operation and then restart the operation.
  • Page 93 Troubleshooting SiENBE28-901 6.6.5 “ ” Inverter Compressor Motor Lock Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Inverter PCB takes the position signal from UVW line connected between the inverter and compressor, and the malfunction is detected when any abnormality is observed in the phase- Malfunction current waveform.
  • Page 94 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check if the stop Local factor valve is open. Open the stop valve. Check if the relay wires Replace the connecting wires and to the compressor are ensure right connection of the...
  • Page 95 Troubleshooting SiENBE28-901 6.6.6 “ ” Malfunction of Outdoor Unit Fan Motor Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of While the fan motor is in operation, detect the malfunction related to the fan motor according to revolutions detected with the hall sensor IC. Malfunction Detection Malfunction...
  • Page 96 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. LRL(M)EQ15A, 20AY1 have 2 fans. Cut the power supply OFF and wait for 10 minutes. Check if any foreign Remove the foreign substances.
  • Page 97 Troubleshooting SiENBE28-901 Troubleshooting No continuity of fuse (FIU) on the Replace fan inverter PCB. fan inverter PCB. Unable to rotate the fan manually with ease when Replace the corresponding removing the connector of fan motor. the fan motor. Resistance value between the power supply wire terminal of fan Replace the corresponding motor and the motor frame (metal)
  • Page 98 SiENBE28-901 Troubleshooting 6.6.7 “ ” Malfunction of Electronic Expansion Valve Coil Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of To be detected based on continuity existence of coil of electronic expansion valve (Y1E) Malfunction Detection Malfunction No current is detected in the common (COM [+]) when power supply is ON. Decision Conditions Supposed...
  • Page 99 Troubleshooting SiENBE28-901 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Turn power supply off, and turn power supply on again. Return to normal? External factor other than malfunction (for example, noise etc.).
  • Page 100 SiENBE28-901 Troubleshooting 6.6.8 “ ” Abnormal Discharge Pipe Temperature Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Abnormality is detected according to the temperature detected by the discharge pipe temperature sensor. Malfunction Detection Malfunction When the discharge pipe temperature rises to an abnormally high level. Decision Discharge pipe temp.
  • Page 101 Troubleshooting SiENBE28-901 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. 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 102 SiENBE28-901 Troubleshooting 6.6.9 “ ” Three-sensor Malfunction Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Malfunction is detected from the values detected by pressure sensors and temperature sensors (thermistors). Malfunction Detection Malfunction Three or more out of the pressure sensors and the temperature sensors (thermistors) causes a Decision "Sensor malfunction", respectively.
  • Page 103 Troubleshooting SiENBE28-901 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. *Three or more sensors malfunction. Check for the malfunction history (malfunction code) on the remote controller to identify three or more malfunctioning sensors.
  • Page 104 SiENBE28-901 Troubleshooting 6.6.10 “ ” Malfunction Related to High Pressure Switch Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Detect continuity in the high pressure switch in the protective device circuit. Malfunction Detection Malfunction While the compressor stops running, there is no continuity in the high pressure switch. Decision Conditions Supposed...
  • Page 105 Troubleshooting SiENBE28-901 6.6.11 “ ” Abnormal Outdoor Fan Motor Signal Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Detection of abnormal signal from fan motor. Malfunction Detection Malfunction In case of detection of abnormal signal at starting fan motor. Decision Conditions Supposed...
  • Page 106 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Cut the power supply off. Is the fan motor connector (X2A) Ensure correct connection. properly connected to the fan inverter PCB? Check the connector of the fan motor (∗1).
  • Page 107 Troubleshooting SiENBE28-901 6.6.12 “ ” Malfunction of Outdoor Air Thermistor Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Malfunction is detected from the temperatures detected by the outdoor air thermistor. Malfunction Detection Malfunction While in operation, the thermistor causes a broken wire or a short circuit in it. Decision Conditions Supposed...
  • Page 108 SiENBE28-901 Troubleshooting 6.6.13 “ ” Current Sensor Malfunction Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Malfunction is detected from the current value detected by current sensor. Malfunction Detection Malfunction When the current value detected by current sensor becomes 5A or lower, or 40A or more during Decision STD compressor operation.
  • Page 109 Troubleshooting SiENBE28-901 6.6.14 “ ” Faulty Thermistor Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Malfunction is detected from the temperatures detected by thermistors. Malfunction Detection Malfunction While in operation, any of the thermistors causes a broken wire or a short circuit in it. Decision Conditions Supposed...
  • Page 110 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the malfunction code " " displayed? There are multiple relevant thermistors. Identify the thermistor using the monitor mode of the outdoor unit PCB.
  • Page 111 Troubleshooting SiENBE28-901 6.6.15 “ ” Malfunction of High Pressure Sensor Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Malfunction is detected from the pressure detected by the high pressure sensor. Malfunction Detection Malfunction When the high pressure sensor is short circuit or open circuit. Decision (Not less than 4.3MPa, or 0.01MPa and below) Conditions...
  • Page 112 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. 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 113 Troubleshooting SiENBE28-901 6.6.16 “ ” Malfunction of Low Pressure Sensor Remote Controller Display Applicable LRMEQ5~20PY1 Models LRLEQ5~20PY1 Method of Malfunction is detected from pressure detected by low pressure sensor. Malfunction Detection Malfunction When the low pressure sensor is short circuit or open circuit. Decision (Not less than 1.8MPa, or -0.1MPa and below) Conditions...
  • Page 114 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. 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 115 Troubleshooting SiENBE28-901 6.6.17 “ ” Faulty Inverter PCB Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Malfunction is detected from the current values while waveform is outputted prior to the startup of compressor. Malfunction Malfunction is detected from the values detected by the current sensor in synchronized Detection operation at startup.
  • Page 116 SiENBE28-901 Troubleshooting 6.6.18 “ ” Malfunction of Inverter Radiating Fin Temperature Rise Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Fin temperature is detected by the thermistor of the radiation fin. Malfunction Detection Malfunction When the temperature of the inverter radiation fin increases above 93°C. Decision Conditions Supposed...
  • Page 117 Troubleshooting SiENBE28-901 6.6.19 “ ” INV Compressor Instantaneous Overcurrent Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Malfunction is detected from the currents flowing in the power transistor. Malfunction Detection Malfunction An overcurrent (59.1A) flows even instantaneously. Decision Conditions Supposed Faulty compressor coil (e.g.
  • Page 118 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. 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 119 Troubleshooting SiENBE28-901 6.6.20 “ ” INV Compressor Overload Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Malfunction is detected from the currents flowing in the power transistor. Malfunction Detection Malfunction Currents on the secondary side of the inverter come to the following values. Decision (1) Not less than 19A for a period of consecutive 5 seconds (2) Not less than 16.1A for a period of consecutive 260 seconds...
  • Page 120 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. 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 121 Troubleshooting SiENBE28-901 6.6.21 “ ” Faulty INV Compressor Startup Remote Controller Display Applicable LRMEQ5~20AY1 Models LRLEQ5~20AY1 Method of Malfunction is detected from the signal waveforms of the compressor. Malfunction Detection Malfunction The compressor startup sequence is not complete. Decision Conditions Supposed Failure to open the stop valve Causes...
  • Page 122 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the first time for the compressor to start after installation? Is a proper amount Charge a proper amount of of refrigerant refrigerant.
  • Page 123 Troubleshooting SiENBE28-901 6.6.22 “ ” Malfunction of Transmission (between Inverter PCB and Main PCB) Remote Controller Display Applicable LRMEQ5~20PY1 Models LRLEQ5~20PY1 Method of Check the communication state between the inverter PCB and the control PCB by micro- computer. Malfunction Detection Malfunction When the correct communication is not conducted in certain period.
  • Page 124 SiENBE28-901 Troubleshooting Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. 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 125 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 126 SiENBE28-901 Troubleshooting 6.6.24 “ ” Faulty Radiation Fin Thermistor Remote Controller Display Applicable LRMEQ5~20PY1 Models LRLEQ5~20PY1 Method of While the compressor stops running, detect the resistance of the radiation fin thermistor. Malfunction Detection Malfunction The thermistor resistance comes to a value equivalent to an open or a short circuit. Decision Conditions Supposed...
  • Page 127 Troubleshooting SiENBE28-901 6.6.25 “ ” Reverse Phase / Open Phase Remote Controller Display Applicable LRMEQ5~20PY1 Models LRLEQ5~20PY1 Method of Make judgement by detecting the state of every phase in the reverse phase detection circuit. Malfunction Detection Malfunction The power supply voltage has a reverse phase or the phase T is open. Decision Conditions Supposed...
  • Page 128 SiENBE28-901 Troubleshooting 6.6.26 “ ” Abnormal Power Supply Voltage Remote Controller Display Applicable LRMEQ5~20PY1 Models LRLEQ5~20PY1 Method of Malfunction is detected from the voltage of the main circuit capacitor in the inverter. Malfunction Detection Malfunction When the voltage aforementioned is not less than 780V or not more than 320V, or when the Decision current-limiting voltage does not reach 200V or more or exceeds 740V.
  • Page 129 Troubleshooting SiENBE28-901 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check for power supply voltage. Voltage Onsite causes. between phases: 380 to Make proper wire connections 415V (Y1) without open phase, erroneous connections, or erroneous order of phases.
  • Page 130 SiENBE28-901 Troubleshooting Check for connector connections: Remove and insert the connectors shown below. Furthermore, check the connectors for terminal conditions and continuity. RXQPAY1: If any wiring has damage, replace • X1M power receiving terminal ⇔ X400A A2P the harness. • A2P X401A ⇔ X10A A3P •...
  • Page 131 Troubleshooting SiENBE28-901 [Check 1] Check for Causes of Rise in High Pressure Referring to the Fault Tree Analysis (FTA) shown below, identify faulty points. ←Check to be sure that the stop valve is open. Closed stop valve Partly rise ←Visual check High piping Bended or crushed pipe in pressure...
  • Page 132 SiENBE28-901 Troubleshooting [Check 2] Check for Causes of Drop in Low Pressure Referring to the Fault Tree Analysis (FTA) shown below, identify faulty points. ←Are the voltage characteristics normal? Faulty low pressure sensor (∗1) Faulty compressor ←Is the pressure value on the Service Checker Faulty low Faulty outdoor unit main PCB capacity...
  • Page 133 Troubleshooting SiENBE28-901 [Check 3] Check for Causes of Overheat Operation Referring to the Fault Tree Analysis (FTA) shown below, identify faulty points. ←Is the coil resistance and Faulty valve coil Faulty the insulation normal? subcool Faulty valve body electronic Faulty expansion discharge valve...
  • Page 134 SiENBE28-901 Troubleshooting [Check 4] Check for Power Transistor <LRMEQ5~20AY1, LRLEQ5~20AY1> Checking failures in power semiconductors mounted on inverter PCB Check the power semiconductors mounted on the inverter PCB by the use of a multiple tester. <Items to be prepared> Multiple tester : Prepare the analog type of multiple tester. For the digital type of multiple tester, those with diode check function are available for the checking.
  • Page 135 Troubleshooting SiENBE28-901 [Check 5] Check for Causes of Wet Operation Referring to the Fault Tree Analysis (FTA) shown below, identify faulty points. Excessive compressor Refrigerant ON-OFF accumulation ←See [Check 6]. Refrigerant overcharge ←Is the coil resistance and the Faulty valve coil Faulty indoor insulation normal? unit electronic...
  • Page 136 SiENBE28-901 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 137 Troubleshooting SiENBE28-901 [Check 7] Vacuum Drying Procedure To conduct vacuum drying in the piping system, follow the procedure for <Normal vacuum drying> shown below. Furthermore, if moisture can get mixed in the piping system, follow the procedure for <Special vacuum drying> shown below. <Normal vacuum drying>...
  • Page 138 SiENBE28-901 Troubleshooting [Check 8] List of Malfunction Codes Related to Inverter Code Name Condition for determining malfunction Major faulty point Inverter getting caught in liquid INV Compressor Inverter output causes an overcurrent Faulty compressor Instantaneous Overcurrent to flow even instantaneously. Faulty inverter PCB Liquid back of compressor Overcurrent of INV...
  • Page 139 Troubleshooting SiENBE28-901 [Check 9] Temperature and Resistance Characteristics of Thermistor Outdoor unit Heat exchanger Applicable Suction air Discharge pipe Radiation fin (Inlet and outlet) Type ST0601 ST0602 ST0901 PTP-46D-D1 Temperature(°C) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) 112.0 10.9 1403.8 111.4 85.5 1059.5 84.1 65.8 806.5...
  • Page 140 SiENBE28-901 Troubleshooting [Check 10] 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 141 Troubleshooting SiENBE28-901 Characteristics of Refrigerant and Psychrometric Chart Characteristics of Refrigerant R-410A Pressure MPa Air Cooled Refrigeration Condensing Unit...

  • Page 142: Maintenance

    SiENBE28-901 Troubleshooting Maintenance 1. Procedure for Removal of Parts from Refrigerant System As the results of checking a malfunction, if the malfunction results from part(s) used in the refrigerant system, remove the part(s) referring to the procedure for refrigerant recovery shown below.
  • Page 143 Troubleshooting SiENBE28-901 1) Maintenance 1: Maintenance related to outdoor unit compressor Applicable parts • Compressors (M1C, M2C and M3C) • Solenoid valves (STD1 and STD2) • INV electronic expansion valve 1 compressor • Four way valve • High pressure switch No continuous operations allowed HPSL HPS1...
  • Page 144 SiENBE28-901 Troubleshooting Applicable parts • Compressors (M1C, M2C and M3C) • Solenoid valves (STD1 and STD2) • INV electronic expansion valve 2 compressors • Four way valve • High pressure switch No continuous operations allowed HPSL HPS1 HPS2 STD1 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 145 Troubleshooting SiENBE28-901 Applicable parts • Compressors (M1C, M2C and M3C) • Solenoid valves (STD1 and STD2) • INV electronic expansion valve 3 compressors • Four way valve • High pressure switch No continuous operations allowed HPSL HPS1 HPS2 HPS3 STD1 STD2 A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve a, b, c: Service ports...
  • Page 146 SiENBE28-901 Troubleshooting 2) Maintenance 2: Maintenance of EV1 and EV2 Applicable parts • Main electronic expansion valve • Injection electronic expansion valve 1 compressor No continuous operations allowed HPSL HPS1 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 147 Troubleshooting SiENBE28-901 Applicable parts • Main electronic expansion valve • Injection electronic expansion valve 2 compressors No continuous operations allowed HPSL HPS1 HPS2 STD1 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 148 SiENBE28-901 Troubleshooting Applicable parts • Main electronic expansion valve • Injection electronic expansion valve 3 compressors No continuous operations allowed HPSL HPS1 HPS2 HPS3 STD1 STD2 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 149 Troubleshooting SiENBE28-901 3) Maintenance 3: Maintenance of showcase and dryer Applicable parts • Main electronic expansion valve • Injection electronic expansion valve 1 compressor No continuous operations allowed HPSL HPS1 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 150: Appendix (Supplementary Information)

    SiENBE28-901 Appendix (Supplementary Information) 7. Appendix (Supplementary Information) Restriction Matter of Showcase • The design pressure of the indoor unit must be 2.5MPa. • Install an R410A mechanical thermostatic expansion valve on eachlindoor unit. • Install an R410A solenoid valve (Max. operating differential pressure of 3.5 MPa (35 bars) or over) on the primary side of the mechanical thermostatic expansion valve described above for each indoor unit.

  • Page 151: Trouble Case With Present Machine (R-407C)

    Appendix (Supplementary Information) SiENBE28-901 Trouble Case with Present Machine (R-407C) Compressor damage due to the overcharge of refrigerant in the field Cause By mistake, a local installer added 1.3 times of the total refrigerant, not 1.3 times of the additional charging refrigerant which is specified in the Installation Manual. (It is already explained in the service news #MJ-08023.
  • Page 152 SiENBE28-901 Appendix (Supplementary Information) Secret MJ–08023 <Convenience-pack> Re-precaution: Hard-and-fast additional refrigerant charge in commissioning Model LRLCP14D1, 2 and all other convenience-pack models This is to inform you again of the precaution (MJ06053) "For additional charge in a commissioning of Conveni-pack, the upper limit shall be 1.3 times as much as that calculated." Because there was a compressor failure caused by over charge that is assumed to be due to a miscalculation.
  • Page 153 Appendix (Supplementary Information) SiENBE28-901 Method of removed and replaced compressor in field This system’s compressor has gas injection pipe. When you replace the compressor, you must remove the piping fixture with gas injection pipe. Please follow the procedure, replace the compressor. Arrow view Gas injection Method removed piping fixture for gas injection pipe...
  • Page 154 SiENBE28-901 Appendix (Supplementary Information) 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 155: Option List

    Appendix (Supplementary Information) SiENBE28-901 Option List Series CONDENSING UNIT FOR REFRIGERATION SYSTEM Model LRLEQ5AY1 LRLEQ5AY1E LRLEQ8AY1 LRLEQ8AY1E LRLEQ15AY1 LRLEQ15AY1E LRLEQ6AY1 LRLEQ6AY1E LRLEQ10AY1 LRLEQ10AY1E LRLEQ20AY1 LRLEQ20AY1E LRLEQ12AY1 LRLEQ12AY1E LRMEQ5AY1 LRMEQ5AY1E LRMEQ8AY1 LRMEQ8AY1E LRMEQ15AY1 LRMEQ15AY1E LRMEQ6AY1 LRMEQ6AY1E LRMEQ10AY1 LRMEQ10AY1E LRMEQ20AY1 LRMEQ20AY1E LRMEQ12AY1 LRMEQ12AY1E Option name Central drain...
  • Page 156 Specifications are subject to change without environment. This challenge demands the eco design prior notice. Daikin Europe N.V. explicitly rejects any liability for any direct or and development of a wide range of products and an indirect damage, in the broadest sense, arising from or related to the use energy management system, resulting in energy and/or interpretation of this publication.

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