Daikin GQI-Eco Series Service Manual
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Daikin GQI-Eco Series Service Manual

R-410a 50hz
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Service Manual
GQI-Eco Series
Heat Pump R-410A 50Hz
Smart
Classic
RZQG71~140L9V1
RZQG71~125L9Y1 / RZQG140LY1
RZQSG71L3V1 / RZQSG100~140L9V1
RZQSG100~125L8Y1 / RZQSG140LY1
ESIE15-13B

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Summary of Contents for Daikin GQI-Eco Series

  • Page 1 ESIE15-13B Service Manual GQI-Eco Series Heat Pump R-410A 50Hz Smart RZQG71~140L9V1 RZQG71~125L9Y1 / RZQG140LY1 Classic RZQSG71L3V1 / RZQSG100~140L9V1 RZQSG100~125L8Y1 / RZQSG140LY1...

  • Page 3: Table Of Contents

    ESIE15-13B GQI-Eco Series Heat Pump R-410A 50Hz 1. Introduction .....................v 1.1 Version log ....................v 1.2 Safety Cautions ..................v 1.3 Used Icons ....................x 1.4 Preface ....................xi Part 1 - General Information ............1 1. Model Names of Indoor / Outdoor Units..........2 2.
  • Page 4 ESIE15-13B Part 4 - Field Setting ..............57 1. Test Operation ..................58 1.1 Pre-run Checks ..................58 1.2 Remote Controller Confirmation.............58 1.3 Test Run....................59 1.4 Precautions Regarding Test Run ............59 1.5 Failure Diagnosis at the Moment of First Installation ......60 2. Field Setting from Remote Controller............61 2.1 Wired Remote Controller................61 2.2 Wireless Remote Controller ..............66 2.3 Settings Contents and Code No.
  • Page 5 ESIE15-13B 4.8 Transmission Error (between Indoor Unit PCB and Adaptor PCB) ..129 4.9 Thermistor Abnormality ................131 4.10 Humidity Sensor System Abnormality ..........132 4.11 Malfunction of Motion Sensor / Floor Temperature Sensor....133 4.12 Remote Controller Thermistor Abnormality ..........138 4.13 Outdoor Unit PCB Abnormality.............139 4.14 High Pressure Abnormality (Detected by the High Pressure Switch)...140 4.15 Actuation of Pressure Sensor...............142 4.16 Compressor Motor Lock ...............144...
  • Page 6 ESIE15-13B Table of Contents...

  • Page 7: Introduction

    ESIE15-13B Introduction 1. Introduction Version log Version history. Version code Description Date Version A Preliminary release November 2015 Version B Addition of combination FUQ + RZQSG February 2016 New controller BRC1E53 Fieldsetting on outdoor PCB: setting 2-7 Reduced airflow added Safety Cautions ...
  • Page 8 Introduction ESIE15-13B Warning The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. Be sure to discharge the capacitor completely before conducting repair work. A charged capacitor may cause an electrical shock. Do not start or stop the air conditioner operation by plugging or unplugging the power cable plug.
  • Page 9 ESIE15-13B Introduction Caution Use the welder in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency.
  • Page 10 Introduction ESIE15-13B 1.2.2 Cautions Regarding Safety of Users Warning Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools may cause an electrical shock, excessive heat generation or fire.
  • Page 11 ESIE15-13B Introduction Warning Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet securely. If the plug has dust or loose connection, it may cause an electrical shock or fire. Be sure to install the product correctly by using the provided standard For unitary type installation frame.

  • Page 12: Used Icons

    Introduction ESIE15-13B Caution Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 MΩ or higher. Faulty insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage may cause the water to enter the room and wet the furniture and floor.

  • Page 13: Preface

    Preface Thank you for your continued patronage of Daikin products. This is the new service manual for Daikin's Year 2016 RZQG-L & RZQSG-L series Heat Pump System. Daikin offers a wide range of models to respond to building and office air conditioning needs.
  • Page 14 Introduction ESIE15-13B...

  • Page 15: Part 1 - General Information

    ESIE15-13B Part 1 General Information 1. Model Names of Indoor / Outdoor Units..........2 2. Outlook Outdoor Units................4 3. Operating range ..................5 3.1 Smart......................5 3.2 Classic......................6 3.3 EDP ......................7 General Information...

  • Page 16: Model Names Of Indoor / Outdoor Units

    Model Names of Indoor / Outdoor Units ESIE15-13B 1. Model Names of Indoor / Outdoor Units Sky-Air High 3x3 HH Duct (medium Wall Slim Cassette 3x3 Thin Cassette cas- cas- Ceil. Susp. Floor ESP) Ceiling Mount duct sette sette duct stand MODEL NAME (current models)
  • Page 17 ESIE15-13B Model Names of Indoor / Outdoor Units 1. Individual indoor capacities are not given because the combinations are for simultaneous Note: operation (= indoor units installed in the same room) 2. When different indoor models are used in combination, designate the remote controller that is equipped with the most functions as the main unit.

  • Page 18: Outlook Outdoor Units

    Outlook Outdoor Units ESIE15-13B 2. Outlook Outdoor Units General Information...

  • Page 19: Operating Range

    ESIE15-13B Operating range 3. Operating range Smart (Cooling) (Heating) Indoor temp. (°C WB) Indoor temp. (°C DB) Notes: 1. Depending on operation and installation conditions, the indoor unit can change over to freeze-up operation (indoor de-icing). 2. To reduce the freeze-up operation (indoor de-icing) frequency it is recommended to install the outdoor unit in a location not exposed to wind.

  • Page 20: Classic

    Operating range ESIE15-13B Classic (Cooling) (Heating) Indoor temp. (°C WB) Indoor temp. (°C DB) Notes: 1. Depending on operation and installation conditions, the outdoor unit can change over to defrost operation (anti freeze-up). 2. To reduce the defrost operation (anti freeze-up) frequency it is recommended to install the outdoor unit in a location not exposed to wind.

  • Page 21: Edp

    ESIE15-13B Operating range (Cooling) (Heating) Indoor temp. (°C WB) Indoor temp. (°C DB) Notes: 1. Depending on operation and installation conditions, the indoor unit can change over to freeze-up operation (indoor de-icing). 2. To reduce the freeze-up operation (indoor de-icing) frequency it is recommended to install the outdoor unit in a location not exposed to wind.
  • Page 22 Operating range ESIE15-13B General Information...

  • Page 23: Part 2 - Remote Controller

    ESIE15-13B Part 2 Remote Controller 1. Wired Remote Controller...............10 1.1 Applicable Models ..................10 1.2 Names and Functions ................10 1.3 MAIN/SUB Setting when Using 2 Remote Controllers ......14 1.4 Centralized Control Group No. Setting...........15 2. Wireless Remote Controller ..............17 2.1 Applicable Models ..................17 2.2 Names and Functions ................17 2.3 MAIN/SUB Setting..................19 3.

  • Page 24: Wired Remote Controller

    Wired Remote Controller ESIE15-13B 1. Wired Remote Controller Applicable Models Model Series FCQHG-F FCQG-F FFQ-C FDXS-F FDBQ-B FBQ-D FDQ-C FDQ-B FAQ-C FHQ-C FUQ-C FNQ-A FVQ-C Remote BRC1D52/BRC1E52A/BRC1E52B/BRC1E53 Controller Names and Functions 1.2.1 BRC1D528 23 7 1. ON/OFF BUTTON Press the ON/OFF button to start or stop the system. 2.
  • Page 25 ESIE15-13B Wired Remote Controller 10. DAY OF THE WEEK INDICATOR The day of the week indicator shows the current week day (or the set day when reading or programming the schedule timer). 11. CLOCK DISPLAY The clock display indicates the current time (or the action time when reading or programming the schedule timer).
  • Page 26 Wired Remote Controller ESIE15-13B 35. FAN SPEED BUTTON This button toggles between L (Low), H (High), HH (very High), (Automatic). 36. AIRFLOW DIRECTION ADJUST BUTTON This button enables to adjust the airflow direction. 37. AIR FILTER CLEANING TIME ICON RESET BUTTON This button is used to reset the air filter cleaning time icon.
  • Page 27 ESIE15-13B Wired Remote Controller 6. Right button (Be sure to press the part with the symbol  Used to highlight the next items on the right-hand side.  Each screen is scrolled in the right-hand direction.  Home leave settings are enabled with this button kept pressed for at least four seconds. 7.

  • Page 28: Main/Sub Setting When Using 2 Remote Controllers

    Wired Remote Controller ESIE15-13B MAIN/SUB Setting when Using 2 Remote Controllers Situation The MAIN/SUB setting is necessary when 1 indoor unit is controlled by 2 remote controllers. When you use 2 remote controllers (control panel and separate remote controller), set one to MAIN and the other to SUB.

  • Page 29: Centralized Control Group No. Setting

    ESIE15-13B Wired Remote Controller Centralized Control Group No. Setting 1.4.1 BRC1D528 In order to conduct the central remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller.
  • Page 30 Wired Remote Controller ESIE15-13B 1.4.2 BRC1E52/53 In order to conduct the centralized remote control using the centralized remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller. Make Group No. settings for centralized remote control using the operating remote controller. (1) <Basic screen>...

  • Page 31: Wireless Remote Controller

    ESIE15-13B Wireless Remote Controller 2. Wireless Remote Controller Applicable Models FCQHG-F Model Series FHQ-C FCQG-F BRC7FA532F BRC7G53 Remote Controller Names and Functions ON OFF (10) DOWN ON OFF TEMP TIME (11) DOWN (13) RESERVE CANCEL (12) TIMER TEST (15) MODE (14) SWING (16)
  • Page 32 Wireless Remote Controller ESIE15-13B TIMER MODE START/STOP BUTTON DISPLAY “ ” (SIGNAL TRANSMISSION) Refer to page 10. This lights up when a signal is being TIMER RESERVE/CANCEL BUTTON transmitted. Refer to page 11. DISPLAY “ ” “ ” “ ” “ ”...

  • Page 33: Main/Sub Setting

    ESIE15-13B Wireless Remote Controller MAIN/SUB Setting Introduction To set the wireless remote controller, you have to set the address for:  The receiver of the wireless remote controller  The wireless remote controller. Setting the Address for the Receiver When using both a wired and a wireless remote controller for 1 indoor unit, the wired controller should be set to MAIN.

  • Page 34: Service Mode

    Service Mode ESIE15-13B 3. Service Mode BRC1D528 3.1.1 Display Service Data Unit No. Mode No. Second Unit NO. Field Code No. Setting SETTING Mode First Code No. 1, 2, 7 TEST 1. Enter the field setting mode. Press the inspection / test operation button for 4 seconds or more. 2.
  • Page 35 ESIE15-13B Service Mode 3.1.2 Service Setting Mode No. Unit No. Mode No. Field Setting Mode Second Unit NO. Field Code No. Setting SETTING Mode First Code No. 1, 2, 6 Second Code No. TEST First Code No. 1,2,6 1. Enter the field setting mode. Press the inspection / test operation button for 4 seconds or more.

  • Page 36: Brc1E52/53

    Service Mode ESIE15-13B BRC1E52/53 3.2.1 Display service data Press and hold Cancel button for 4 seconds or longer during backlight lit. Select “Field setting list” Press Menu/Enter button. In the case of setting per indoor unit during group control (When Mode No. such as 20, 21, 22, 23, 25 are selected), highlight the unit No.
  • Page 37 ESIE15-13B Service Mode In the case of individual setting per indoor unit [In the case of individual setting per indoor unit, current settings are displayed. And, SECOND CODE NO. “-” means no function.] Highlight SECOND CODE NO. of the FIRST CODE NO. to be changed, and select desired “SECOND CODE NO.”...
  • Page 38 Service Mode ESIE15-13B In the case of group total setting SECOND CODE NO. FIRST CODE (SW) NO. [In the case of group total setting, all of SECOND CODE NO. which may be set are displayed as “*”. “*” is changed to SECOND CODE NO.

  • Page 39: Inspection Mode

    ESIE15-13B Inspection Mode 4. Inspection Mode BRC1D528 Normal display (No display) Press the Inspection/test button once. Unit Error code Inspection (1) Inspection mode (1) Inspection mode Press the Inspection/test button once. Unit Error code Inspection Error code blinks when an error occurs. 0 7 1 F J J (2) Indoor unit model code...

  • Page 40: Brc1E52/53

    Inspection Mode ESIE15-13B BRC1E52/53 If an error occurs, either one of the following items will blink in the basic screen. “Error: Press Menu Button.” * The operation indicator will blink. “Warning: Press Menu Button.” * The operation indicator will not blink. Press Menu/Enter button.

  • Page 41: Part 3 - Function And Control

    ESIE15-13B Part 3 Function and Control 1. Function of Main Components and Thermistors ........28 2. Operation Flow Chart ................30 2.1 Cooling / Dry Operation................30 2.2 Heating Operation ..................31 3. Function Details ..................32 3.1 Indoor Unit....................32 3.2 Outdoor Unit ...................36 Function and Control...

  • Page 42: Function Of Main Components And Thermistors

    Function of Main Components and Thermistors ESIE15-13B 1. Function of Main Components and Thermistors RZQG-L9V1 Pair application (B) Electronic expansion valve Outdoor Filter Filter PCB Cooling heat exchanger (C) Four way valve Check valve Pressure switch Pressure (low) switch (high) Indoor heat Service...
  • Page 43 ESIE15-13B Function of Main Components and Thermistors  Outdoor Unit (A) Compressor (M1C) Inverter drive unit varies compressor operating frequency to control capacity and other factors. (B) Electronic Expansion Valve (Y1E) Provides control to maintain optimum operating condition for high efficiency. (C) Four Way Valve (Y1S) Changes operation of cooling / heating.

  • Page 44: Operation Flow Chart

    Operation Flow Chart ESIE15-13B 2. Operation Flow Chart Cooling / Dry Operation Power supply ON Initialize electronic expansion valve Initialize micro-computer Preheating operation control Remote controller operation judgement Cooling/Dry Emergency Operation mode judgement Emergency Heating operation Heating Cooling/Dry Thermostat ON judgement Starting control four way valve changeover Normal control...

  • Page 45: Heating Operation

    ESIE15-13B Operation Flow Chart Heating Operation Power supply ON Initialize electronic expansion valve Initialize micro-computer Preheating operation control Remote controller ON operation judgement Cooling/Dry Emergency Operation mode judgement Emergency Heating operation Heating Cooling/Dry Thermostat ON judgement Starting control four way valve changeover Hot start control Normal control ·...

  • Page 46: Function Details

    Function Details ESIE15-13B 3. Function Details Indoor Unit 3.1.1 Set Temperature and Control Temperature The relationship between "Set temperature by remote controller" and "Control target temperature" is as shown below. 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 3435°C Set temperature by remote controller Control target temperature...
  • Page 47 ESIE15-13B Function Details  In dry operation ΔT < -2.5ºC Tro > 24ºC Dry operation Thermostat OFF Δ > -1ºC 24ºC ≥ Tro > 16ºC ΔT < -2ºC Dry operation Thermostat OFF Δ > -1ºC 16ºC ≥ Tro Tr < 13ºC Dry operation Thermostat OFF Tr >...
  • Page 48 Function Details ESIE15-13B  Heating When the following condition consists by mounting the adaptor for wiring PCB, the drain pump is turned on. Drain pump 5 min. 5 sec. Float switch 3.1.6 Control when the Operation Mode is Set to “Auto” Setting the operation mode to “Auto”...
  • Page 49 ESIE15-13B Function Details Dew condensation prevention control Dry operation with horizontal airflow is carried out for 1 hour. (P2) 1. When there is any change to heating/fan modes, airflow direction and operation ON/OFF Note: state during dew condensation prevention control, this control is reset. 3.1.8 Freeze-up Prevention Control The unit will perform the forced thermostat off function in following conditions: Thermostat off due to freeze-up prevention.

  • Page 50: Outdoor Unit

    Function Details ESIE15-13B Outdoor Unit 3.2.1 Abnormal Stop When the following items show abnormal values, the thermostat turns OFF and error is determined based on the number of retry in order to protect the compressor and other devices. Item Criteria Number of retry LPS activated or 0.12 MPa or less continues Low pressure...
  • Page 51 ESIE15-13B Function Details 3.2.3 Preheating Operation Control After the compressor has been turned OFF, the preheating operation control will be activated in order to avoid refrigerant from dissolving in the compressor oil and quick increase of heating level during the heating operation. Starting Conditions •...
  • Page 52 Function Details ESIE15-13B 3.2.6 Room Thermostat Control Based on the difference between the set temperature by remote controller and indoor unit suction air temperature, the thermo. is turned on and off. ΔT = Indoor suction air temperature – temperature set by remote controller (Cooling) ΔT = Temperature set by remote controller –...
  • Page 53 ESIE15-13B Function Details 3.2.7 Compressor Step The compressor operation frequency is controlled in order to keep a constant evaporation temperature in cooling and a constant condensing temperature in heating. Δt cool = Remote controller set temperature - Indoor return air temperature. Cooling Depending on Δt cool and the cooling load, the target evaporating temperature will be a value between 2°C and 20°C.
  • Page 54 Function Details ESIE15-13B 3.2.8 General Electronic Expansion Valve Control When cooling/heating, PI control of electronic expansion valve is conducted to keep the heat exchanger outlet subcooling degree constant. • Target heat exchanger outlet subcooling degree > actual heat exchanger outlet subcooling degree ...
  • Page 55 ESIE15-13B Function Details 3.2.10 Night-time Quiet Operation A. Setting by Remote Controller Night-time quiet operation can be set by field setting from the wired remote controller. By estimating current time based on the change of outdoor air temperature, the low noise operation is automatically performed at night (from 22:00 to 8:00) by limiting the number of revolutions of outdoor unit fan and the operation frequency of the compressor.
  • Page 56 Function Details ESIE15-13B 3.2.12 High Pressure Protection Control In order to prevent abnormal high pressures in the system and hence avoiding activation of the high pressure safety device the below control function will be activated. (Cooling) (Heating) Normal operation Normal operation •...
  • Page 57 ESIE15-13B Function Details 3.2.14 Suction Pipe Superheat Protection Control (Only in Heating Operation) In case the suction superheat value in heating mode is too high, the oil return to the compressor will be insufficient. In order to avoid that the compressor oil will be accumulated in the outdoor unit heat exchanger, the upper limit frequency will be controlled.
  • Page 58 Function Details ESIE15-13B 3.2.15 Discharge Pipe Temperature Protection Control Electronic expansion valve opening degree and the compressor operating frequency will be controlled in order to avoid abnormal high compressor temperatures. Td: Discharge pipe temperature Compressor Operating Frequency Control Normal operation •...
  • Page 59 ESIE15-13B Function Details 3.2.17 Thermostat OFF due to Outdoor Air Temperature (Only in Heating Operation) If outdoor air temperature is high, the unit conducts forced thermostat OFF at the following temperature to protect the system. Outdoor air temperature > 32°C 3.2.18 Inverter Current Protection Control Restricts compressor operation frequency to prevent compressor from tripping due to inverter overcurrent.
  • Page 60 Function Details ESIE15-13B 3.2.19 Low Outdoor Air Temperature Control in Cooling Operation Controls compressor and outdoor unit fan under low outdoor air temperature condition to secure pressure difference between high and low pressure. Hp: High pressure Lp: Low pressure Ta: Outdoor air temperature Tfin: Inverter fin temperature Hp-Lp >...
  • Page 61 ESIE15-13B Function Details 3.2.20 Protection Control by Overall Current Monitors the overall current and restricts the upper limit compressor operating frequency to prevent circuit breakers from exceeding the rated capacity. Normal operation Outdoor unit current ≤ upper limit current value &...
  • Page 62 Function Details ESIE15-13B 3.2.25 Defrost Operation When in heating mode, a defrost operation will be conducted in order to avoid ice formation on the outdoor unit heat exchanger. Starting Conditions Defrost will start when the following conditions have been realized: •...
  • Page 63 ESIE15-13B Function Details Defrost Control Defrosting start Defrosting complete previous control A Hz Compressor 0 Hz Four way valve 480 pls Electronic (wet protection control) expansion valve 0 pls (5~60 sec.) 0 pls (5 sec.) Outdoor unit fan Indoor unit fan Model RZQG71L Step 25...
  • Page 64 Function Details ESIE15-13B 3.2.28 Simulated Operation Function In case of a thermistor error, simulated operation is performed in two different ways as shown below even while the error is detected. A. Operation continues while the error code is displayed on the remote controller. Applicable thermistors ·...
  • Page 65 ESIE15-13B Function Details 3.2.29 Test Operation Control When operating in cooling mode for the first time after installation or operating in cooling mode by pressing the indoor unit inspection button, the unit will perform a test operation for about 3 minutes.
  • Page 66 Function Details ESIE15-13B 3.2.30 Improved Comfort in Cooling by Te Control You can increase the comfort feeling for the customer by limiting the lower Te value. With higher Te values, the latent capacity will drop (and eventually the sensible capacity). The EER should increase =>...
  • Page 67 ESIE15-13B Function Details Cooling TeS Lower Limit Value Field setting to control the different value: Value Setting 2-54- 2-57- 2-58- 2-59- Heating TcS Upper Limit Value Field setting to control the different value: Value Setting 2-60- 2-61- 2-62- 2-63- If quick cooling/heating function is selected by the customer via remote controller, the unit will Note: go into quick cooling/heating for 20 minutes, neglecting the selected Te/Tc.
  • Page 68 Function Details ESIE15-13B Te Lower Limit Tc Upper Limit Example cooling: A= 13°C Te lower limit B= 6°C Te lower limit C= 17°C Ta D= 27°C Ta Example heating: A= 49°C Tc upper limit B= 44°C Tc upper limit C= 2°C Ta D= 18°C Ta 3.2.33 Slow start for EDP applications There is new setting available that will allow the unit to perform a slow start to avoid that the unit...
  • Page 69 ESIE15-13B Function Details Main PCB OU KRP58M51 X800M X77A X28A Bottom plate Signal: heater 0V or 230V For RZQG71 the bottom plate heater and free cooling cannot be combined as there is no X28A terminal present on the outdoor unit PCB. Outdoor unit setting 2-53-xx The customer will have the choice to select 2 parameters to control the activation of the free cooling.
  • Page 70 Function Details ESIE15-13B Control logic of the Free Cooling Free cooling DT-rs ≥ 2+X DT-fc Thermo off Y & Thermo on + X DT-fc: Indoor T - Outdoor T DT-rs: Room T - Setpoint T X: To increase the free cooling start temperature Y: The minimum required DT-fc to start the free cooling Function and Control...

  • Page 71: Part 4 - Field Setting

    ESIE15-13B Part 4 Field Setting 1. Test Operation ..................58 1.1 Pre-run Checks ..................58 1.2 Remote Controller Confirmation.............58 1.3 Test Run....................59 1.4 Precautions Regarding Test Run ............59 1.5 Failure Diagnosis at the Moment of First Installation ......60 2. Field Setting from Remote Controller............61 2.1 Wired Remote Controller................61 2.2 Wireless Remote Controller ..............66 2.3 Settings Contents and Code No.

  • Page 72: Test Operation

    Test Operation ESIE15-13B 1. Test Operation Live parts can be easily touched by accident. WARNING Never leave the unit unattended during installation or servicing when the service panel is removed. Never perform a test run with the discharge piping thermistor (R2T) and suction piping thermistor (R3T) removed, as this might break the compressor.

  • Page 73: Test Run

    ESIE15-13B Test Operation Test Run 1. Make sure the liquid and gas stop valves are open. Opening direction Liquid side Gas side Remove the cap and turn counterclockwise with a hex wrench until it stops 2. Be sure to close the front side panel before operation, as not doing so can cause electric shock.

  • Page 74: Failure Diagnosis At The Moment Of First Installation

    Test Operation ESIE15-13B Failure Diagnosis at the Moment of First Installation • In case nothing is displayed on the remote controller (the current set temperature does not display), check for any of the following abnormalities before you can diagnose possible malfunction codes.

  • Page 75: Field Setting From Remote Controller

    ESIE15-13B Field Setting from Remote Controller 2. Field Setting from Remote Controller Individual function of indoor unit can be changed from the remote controller. At the time of installation or after service inspection / repair, make the local setting in accordance with the following description.
  • Page 76 Field Setting from Remote Controller ESIE15-13B 2.1.2 BRC1E52 <Basic screen> Press and hold Cancel button for 4 seconds or more. Field setting menu is displayed. Select Field setting list in the field setting menu, and press Menu/Enter button. Field setting list screen is displayed.
  • Page 77 ESIE15-13B Field Setting from Remote Controller Press Menu/Enter button. Setting <Setting confirmation screen> confirmation screen is displayed. Select and press Menu/Enter button. Setting details are determined and field setting list screen returns. In the case of multiple setting changes, repeat “(3)” to “(7)”. After all setting changes are completed, press Cancel button twice.
  • Page 78 Field Setting from Remote Controller ESIE15-13B 2.1.3 Remote controller settings Level Setting Code Function Adjustment Description Info Remote controller setting (BRC1E) Automatic summer/ No automatic changeover wintertime changeover Automatic changeover active Setting menu available in 1x RETURN -> Extended Extended functions functions ->...
  • Page 79 ESIE15-13B Field Setting from Remote Controller Level Setting Code Function Setting Description Info Remote controller setting (BRC1E) Unit of temperature °C Optional choice of °C or °F 1x RETURN -> Extended in "Extended functions" functions -> Unit of menu option temperature "Away from Home Not available...

  • Page 80: Wireless Remote Controller

    Field Setting from Remote Controller ESIE15-13B Wireless Remote Controller UP button Mode No. Field setting mode DOWN button RESERVE button First code No. MODE button Second code No. INSPECTION/TEST button Setting To set the field settings, you have to change: ...

  • Page 81: Settings Contents And Code No. For Indoor Units

    ESIE15-13B Field Setting from Remote Controller Settings Contents and Code No. for Indoor Units  You can change the setting of 3 x 3 sensing cassette as mentioned below  The method of field setting, which can be conducted through remote controller, is established practice, but it is possible only with BRCE52 remote controller.
  • Page 82 Field Setting from Remote Controller ESIE15-13B The largest time interval for Dust Collection Sign About 5000 hrs About 1250 hrs Display for "self About 2500 hrs (less dusty — — (Dusty place) cleaning decoration place) panel" Non display: - Display: - Display or non-display Display both: - airconditioning...
  • Page 83 ESIE15-13B Field Setting from Remote Controller When using remote controller Set temperature (˚C) Cooling Room temperature thermistor Room temperature thermistor Suction air thermistor Suction air thermistor Suction air thermistor Suction air thermistor Suction air thermistor Suction air thermistor Suction air thermistor Suction air thermistor Suction temperature (˚C) Set temperature (˚C)
  • Page 84 Field Setting from Remote Controller ESIE15-13B Airflow Rate Set the airflow when thermostat OFF by the combination of "Fan OFF at Thermostat OFF" 11(21)-2, "Fan speed heating thermostat OFF" 12(22)-3 and "Fan speed cooling thermostat OFF" 12(22)-6. A : 6 minutes OFF / 1 minute LL B : 6 minutes OFF / 1 minute setting airflow C : 6 minutes OFF / 1 minute L Set the airflow by the combination of 3 modes as below.
  • Page 85 ESIE15-13B Field Setting from Remote Controller Automatic Operation Mode Control When selecting “Automatic Operation Mode” with the remote controller, conducts the most comfortable operation in which you do not feel too cool or too hot. Outdoor air temperature Calculates and controls the optimum indoor Indoor air temperature temperature Temperature set by remote controller...
  • Page 86 Field Setting from Remote Controller ESIE15-13B Airflow Direction Setting Set the air flow direction of indoor units as below. (Set when optional air outlet blocking pad has been installed.) Mode No. First Code No. Second Code No. Setting F: 4-direction air flow 13 (23) T: 3-direction air flow Airflow Range Setting...

  • Page 87: Overview Of The Field Setting On The Outdoor Units

    ESIE15-13B Field Setting from Remote Controller Overview of the Field Setting on the Outdoor Units The table below contains the remote controller settings. Remote controller Factory settings Mode First Description Second Code No. Details Code Night time low Disabled Automatic Capacity Automatic —...

  • Page 88: Quiet (Low Noise) Operation

    Field Setting from Remote Controller ESIE15-13B Quiet (Low Noise) Operation Lower the operation sound of the outdoor unit. Purpose Silent Operation can be activated by: Setting 1. Automatic control (By field setting from remote controller) 2. External activation (from optional PCB KRP58M) 2.5.1 Quiet (Low Noise) Operation by Automatic Control Silent operation can be set by field setting from the wired remote controller: Table...
  • Page 89 ESIE15-13B Field Setting from Remote Controller 2.5.2 External Activation from Optional PCB Quiet (low noise) operation can also be activated from the optional PCB. Graph Transmission connector (on outdoor PCB X6A) Power supply connector (on outdoor PCB X77A) 1 2 3 4 X800M X801M 1 LNOP COM...

  • Page 90: I-Demand Function

    Field Setting from Remote Controller ESIE15-13B I-Demand Function Set a limitation towards the power consumption from the system (e.g. budget control, limit Purpose power consumption during peak moments,..). 3 different demand setting can be selected by using terminal X801M: Setting ...

  • Page 91: Setting For Low Humidity Application

    ESIE15-13B Field Setting from Remote Controller Setting for Low Humidity Application Can be set when using the RZQG units for year round cooling in low humidity applications such Purpose as computer rooms (EDP rooms), technical rooms, etc...to increase the capacity of the unit. Definition of Low Humidity Area Relative...
  • Page 92 Field Setting from Remote Controller ESIE15-13B Target evaporating temperature control in case of factory setting 16(26)-2-01: Graph 1 Te target acceptable area Remote controller setting temp. Te target limited ≤ 20˚C (to protect the comp.) Te target limited ≤ Indoor temp. – 11˚ (not to rising wetbulb) Te (see note) target acceptable area...
  • Page 93 ESIE15-13B Field Setting from Remote Controller Target evaporating temperature control when "low humidity application" is selected. Field Graph 2 setting 16(26)-2-03: Te target acceptable area Remote controller setting temp. Te target Te target limited ≤ 20˚C (˚C) (to protect the comp.) Te (see note) target acceptable area Indoor temp.

  • Page 94: Defrost Start Setting

    Field Setting from Remote Controller ESIE15-13B Target evaporating temperature control when "low humidity application + freeze up operation Graph 3 prevention" is selected. Field setting 16(26)-2-04: Te target acceptable area Remote controller setting temp. Te target (˚C) Te target limited ≤ 20˚C (to protect the comp.) Te (see note) target acceptable area Indoor temp.

  • Page 95: Field Setting From Outdoor Unit Pcb

    ESIE15-13B Field Setting from Outdoor Unit PCB 3. Field Setting from Outdoor Unit PCB Location of DIP Switch and BS Button Various settings are available by using the DIP switches and the BS buttons on the PCB. Display Lamp MODE TEST L.N.O.P DEMAND...

  • Page 96: Field Setting For Outdoor Unit

    Field Setting from Outdoor Unit PCB ESIE15-13B Field Setting for Outdoor Unit 3.2.1 Setting by BS Buttons With "Setting mode 1," "Setting mode 2" and "Monitor mode," various settings and data can be checked. (1) Setting mode 1 The initial status (normal operation) is "Setting mode 1." This mode indicates operating status - "TEST (test operation),"...
  • Page 97 ESIE15-13B Field Setting from Outdoor Unit PCB 3.2.3 Setting Mode 2 In this mode, settings for the following items can be made. Press the MODE (BS1) button for 5 seconds and set to “Setting mode 2”. <Selection of setting conditions> Press the SET (BS2) button and set to the setting condition you want.
  • Page 98 Field Setting from Outdoor Unit PCB ESIE15-13B h: OFF k: ON Display of setting items Display of setting conditions LED display LED Display Setting items Setting condition H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P X = OFF, Y = OFF (factory set) X = 0, Y = 5...
  • Page 99 ESIE15-13B Field Setting from Outdoor Unit PCB  Setting of Demand 2 operation With this setting, compressor operation can be controlled to reduce power consumption. (60% - 80% demand is available when a demand adapter (optional accessory) is used.) Setting item Setting condition Description Operates with 30% of rated...
  • Page 100 Field Setting from Outdoor Unit PCB ESIE15-13B  Setting of Refrigerant Recovery Mode When a refrigerant recovery unit is connected onsite to recover refrigerant, fully open the expansion valve of the outdoor unit to help the recovery. (1) Stop operation. (2) Turn ON refrigerant recovery mode by performing the following steps.
  • Page 101 ESIE15-13B Field Setting from Outdoor Unit PCB 3.2.4 Monitor Mode In this mode, the following items can be checked by using the BS buttons. Setting item LED display Data display To enter the monitor mode, press the MODE H1P H2P H3P H4P H5P H6P H7P (BS1) button when in “Setting mode 1”.
  • Page 102 Field Setting from Outdoor Unit PCB ESIE15-13B 3.2.5 List of Contents of Retry and Error Take the following steps to check contents of retry and error. To enter "Monitor mode," press the MODE (BS1) <Display of RETURN 2> button when in "Setting mode 1." When SET (BS2) button is pressed, the LED display for RETURN 2 turns ON.
  • Page 103 ESIE15-13B Field Setting from Outdoor Unit PCB 3.2.6 List of Detailed Error Codes (SkyAir) Indoor unit Troubleshooting Error code Description of error Description of diagnosis A6 - 01 Fan motor locked A locked fan motor current has been detected. Turn the fan by hand to check for the connection of connectors.
  • Page 104 Field Setting from Outdoor Unit PCB ESIE15-13B Outdoor unit Troubleshooting Error code Description of error Description of diagnosis E7 - 01 Fan motor lock The fan motor has caused abnormal rotation. Check for the connection of the connector between the fan motor and the outdoor unit PC board.
  • Page 105 ESIE15-13B Field Setting from Outdoor Unit PCB 3.2.7 Troubleshooting Troubleshooting Error code Description of error Description of diagnosis Gas shortage - Outdoor unit (Factor 0) This error results from a shortage of refrigerant. Refer to the U0 - 02 “ ”...

  • Page 106: Emergency Operation

    Emergency Operation ESIE15-13B 4. Emergency Operation Forced Operation As emergency operational methods, there are three methods as shown below. Choose the best method that is suitable for each purpose of use. Operation Activation Name Application Setting method Thermistor Drain Remark detection protection Pump...
  • Page 107 ESIE15-13B Emergency Operation Operation by the Test Operation Mode As test run by the test operation mode, there are two methods as shown below. <Test Operation by Wireless Remote Controller> 1. Press the Inspection / Test Operation button 4 times. Press the Inspection / Test Operation button 4 times.
  • Page 108 Emergency Operation ESIE15-13B Field Setting...

  • Page 109: Part 5 - Service Diagnosis

    ESIE15-13B Part 5 Service Diagnosis 1. Maintenance Inspection ...............97 1.1 Overview ....................97 2. Symptom-based Troubleshooting ............99 2.1 Overview ....................99 2.2 Equipment does not Operate ..............100 2.3 Indoor Unit Fan Operates, but Compressor does not Operate ...102 2.4 Cooling / Heating Operation Starts but Stops Immediately ....104 2.5 After Unit Shuts Down, It cannot be Restarted for a While ....105 2.6 Equipment Operates but does not Provide Cooling ......107 2.7 Equipment Operates but does not Provide Heating ......109...
  • Page 110 ESIE15-13B 4.27 Stall Prevention (Time Lag) ..............163 4.28 Transmission System Abnormality (between Control and Inverter PCB) ....................165 4.29 Open Phase or Power Supply Voltage Imbalance ......166 4.30 Defective Capacity Setting ..............167 4.31 Refrigerant Shortage (Alert) ..............168 4.32 Refrigerant Shortage (Error) ..............169 4.33 Power Supply Voltage Abnormality .............171 4.34 Transmission Error between Indoor and Outdoor Unit ......173 4.35 Transmission Error Between Remote Controller and Indoor Unit ..176...

  • Page 111: Maintenance Inspection

    ESIE15-13B Maintenance Inspection 1. Maintenance Inspection Overview When performing maintenance, you should at least perform the following inspections: Indoor unit Transmission wiring between indoor and outdoor units Is the air filter dirty? What about switch capacity? What about cable thickness? To dedicated What about voltage and current? breaker...
  • Page 112 Maintenance Inspection ESIE15-13B Correlation of Air-Conditioner’s Operation Status and Pressure / Running Current What happens in comparison to normal values is summarized in the table below. (Measured for 15 ~ 20 minutes or more after operation starts.) Cooling Air-Conditioner Status Low Pressure High Pressure Running Current...

  • Page 113: Symptom-Based Troubleshooting

    ESIE15-13B Symptom-based Troubleshooting 2. Symptom-based Troubleshooting Overview Symptom Details of Measures Equipment does not operate. Refer to P.100 Indoor fan operates, but compressor does not Refer to P.102 operate. Cooling/heating operation starts but stops Refer to P.104 immediately. After unit shuts down, it cannot be restarted for a Refer to P.105 while.

  • Page 114: Equipment Does Not Operate

    Symptom-based Troubleshooting ESIE15-13B Equipment does not Operate All models of SkyAir series Applicable Model  Fuse blown or disorder of contact in operation circuit Supposed  Defective operation switch or contact point Causes  Defective high pressure switch  Defective magnetic switch for fan motor ...
  • Page 115 ESIE15-13B Symptom-based Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the power switch OFF or fuse for power Turn ON the power switch or switch blown? replace the fuse.

  • Page 116: Indoor Unit Fan Operates, But Compressor Does Not Operate

    Symptom-based Troubleshooting ESIE15-13B Indoor Unit Fan Operates, but Compressor does not Operate All models of SkyAir series Applicable Model  Fuse blown or disorder of contact in operation circuit Supposed  Defective thermistor Causes  Defective indoor/outdoor unit PCB  Defective magnetic switch ...
  • Page 117 ESIE15-13B Symptom-based Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. · Indoor unit fan runs at set airflow rate. · (In cooling operation) When suction air thermistor temperature is higher than set temperature ·...

  • Page 118: Cooling / Heating Operation Starts But Stops Immediately

    Symptom-based Troubleshooting ESIE15-13B Cooling / Heating Operation Starts but Stops Immediately All models of SkyAir series Applicable Model  Overcharge of refrigerant Supposed  Air mixed in refrigerant system Causes  Defective pressure switch  Defective magnetic switch for outdoor unit fan motor ...

  • Page 119: After Unit Shuts Down, It Cannot Be Restarted For A While

    ESIE15-13B Symptom-based Troubleshooting After Unit Shuts Down, It cannot be Restarted for a While All models of SkyAir series Applicable Model  Overcurrent relay (for compressor) Supposed Overcurrent relay may act due to the following reasons Causes Lower voltage of power supply Excess level of high pressure Insufficient size of power cable Defective compressor...
  • Page 120 Symptom-based Troubleshooting ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Turn the operation switch ON and OFF, then wait at ON side. Does the unit start operation after Normal.

  • Page 121: Equipment Operates But Does Not Provide Cooling

    ESIE15-13B Symptom-based Troubleshooting Equipment Operates but does not Provide Cooling All models of SkyAir series Applicable Model  Overcurrent relay (for compressor) Supposed Overcurrent relay may act due to the following reasons Causes Lower voltage of power supply Excess level of high pressure Insufficient size of power cable Defective compressor ...
  • Page 122 Symptom-based Troubleshooting ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Measure the temperature of suction air and discharge air. Temperature difference = Suction air temp. – Discharge air temp. Temperature Does the heat difference for cooling should be...

  • Page 123: Equipment Operates But Does Not Provide Heating

    ESIE15-13B Symptom-based Troubleshooting Equipment Operates but does not Provide Heating All models of SkyAir series Applicable Model  Overcharge of refrigerant Supposed  Air mixed in refrigerant system Causes  Defective pressure switch  Defective magnetic switch for outdoor unit fan motor ...
  • Page 124 Symptom-based Troubleshooting ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is this first starting This is normal. Heating after installation? operation will be conducted after 2 or 3 minutes (∗). Is the unit in defrost mode? Wait for a while.

  • Page 125: Equipment Discharges White Mist

    ESIE15-13B Symptom-based Troubleshooting Equipment Discharges White Mist All models of SkyAir series Applicable Model  Humid installation site Supposed  Installation site is dirty and with dense oil mists. Causes  Soiled heat exchanger  Clogged air filter  Defective fan motor Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

  • Page 126: Equipment Produces Loud Noise Or Vibration

    Symptom-based Troubleshooting ESIE15-13B Equipment Produces Loud Noise or Vibration All models of SkyAir series Applicable Model  Defective installation Supposed  Overcharge of refrigerant Causes  Air mixed in refrigerant system  Flushing noise due to refrigerant shortage. (Sound of shoo...) Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

  • Page 127: Equipment Discharges Dust

    ESIE15-13B Symptom-based Troubleshooting 2.10 Equipment Discharges Dust All models of SkyAir series Applicable Model  Carpet Supposed  Animal hair Causes  Application (cloth shop,...) Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Does the trouble generate at the time of operation start...

  • Page 128: Remote Controller Lcd Displays "88

    Symptom-based Troubleshooting ESIE15-13B 2.11 Remote Controller LCD Displays " " All models of SkyAir series Applicable Model Supposed Causes Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Trouble generates just after power The unit is checking to confirm supply ON.

  • Page 129: Swing Flap Does Not Operate

    ESIE15-13B Symptom-based Troubleshooting 2.12 Swing Flap does not Operate All models of SkyAir series Applicable Models Visual check Method of Error Detection When ON/OFF of the micro-switch for positioning cannot be reversed even through the swing Error Decision flap motor for a specified amount of time (about 30 seconds). Conditions Some functions can force the swing flap into a fixed position, although swing mode is selected Remark...
  • Page 130 Symptom-based Troubleshooting ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Are the connectors (∗) Connect correctly. correctly connected? Is the limit switch’s transfer Connect correctly. connector correctly connected? Turn the power supply off once and back on, and check whether the...

  • Page 131: Troubleshooting By Led Indications

    ESIE15-13B Troubleshooting by LED Indications 3. Troubleshooting by LED Indications Troubleshooting by LED on the Indoor Unit Foreword Troubleshooting can be carried out by service monitor LED (green). (Blinks when normal) k : LED on / h : LED off / l : LED blinks Micro-computer Normal Monitor Contents/Processing...

  • Page 132: Troubleshooting By Remote Controller

    Troubleshooting by Remote Controller ESIE15-13B 4. Troubleshooting by Remote Controller Procedure of Self-diagnosis by Remote Controller 4.1.1 Wired Remote Controller — BRC1D528 If operation stops due to error, the remote controller’s operation LED blinks, and error code is displayed. (Even if stop operation is carried out, error contents are displayed when the inspection mode is entered.) The error code enables you to tell what kind of error caused operation to stop.
  • Page 133 ESIE15-13B Troubleshooting by Remote Controller 4.1.2 Wired Remote Controller — BRC1E51/52A7 The following will be displayed on the screen when a malfunction (or a warning) occurs during operation. Check the malfunction code and take the corrective action specified for the particular model. Screen Operation lamp (1) Checking a malfunction or warning...
  • Page 134 Troubleshooting by Remote Controller ESIE15-13B 4.1.3 Wireless Remote Controller If unit stops due to an error, the operation indicating LED on the signal receiving part of indoor unit flashes. The error code can be determined by following the procedure described below. (The error code is displayed when an operation error has occurred.
  • Page 135 ESIE15-13B Troubleshooting by Remote Controller Normal status Enters inspection mode from normal status when the INSPECTION/ TEST button is pressed. 1 Press INSPECTION/TEST button. If no button is pressed for 1 minute, equipment returns to normal status. 3 Press MODE selector button.

  • Page 136: Error Codes And Description

    Troubleshooting by Remote Controller ESIE15-13B Error Codes and Description Remote Controller Contents of Error Reference Page Display Indoor Unit Indoor unit PCB abnormality Drain water level system abnormality Indoor unit fan motor abnormality Capacity setting abnormality Transmission Error (between indoor unit PCB and adaptor PCB) Heat exchanger thermistor system abnormality Intermediate heat exchanger thermistor system abnormality Suction air thermistor system abnormality...

  • Page 137: Safety Devices

    ESIE15-13B Troubleshooting by Remote Controller Safety Devices 4.3.1 Outdoor Unit High pressure switch Model Fuse Open Close RZQG71L 4.0 MPa +0/– 0.15 3.0 MPa ± 0.15 6.3A/250V (F1U), 3.15A/250V (F6U) RZQG100L 6.3A/250V (F1U, F2U, F3U), RZQG125L 5A/250V (F6U) RZQG140L 4.3.2 Indoor Unit Thermal protector Model Fuse...

  • Page 138: Indoor Unit Pcb Abnormality

    Troubleshooting by Remote Controller ESIE15-13B Indoor Unit PCB Abnormality Remote Controller Display All models of indoor unit Applicable Models Check data from E PROM. Method of Error Detection The error is generated when the data from the E PROM is not received correctly. Error Decision Conditions PROM (Electrically Erasable Programmable Read Only Memory): A memory chip that holds...

  • Page 139: Drain Water Level System Abnormality

    ESIE15-13B Troubleshooting by Remote Controller Drain Water Level System Abnormality Remote Controller Display All models of indoor unit Applicable Models By float switch OFF detection Method of Error Detection The error is generated when the water level reaches its upper limit and when the float switch Error Decision turns OFF.
  • Page 140 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the unit a cassette type? Is the optional drain pump kit installed? Is the short circuit connector connected Connect the short circuit to X15A on the indoor...

  • Page 141: Indoor Unit Fan Motor Abnormality

    ESIE15-13B Troubleshooting by Remote Controller Indoor Unit Fan Motor Abnormality Remote Controller Display All models of indoor unit Applicable Models Detection of abnormal rotation speed of fan motor by signal from the fan motor Method of Error Detection The error is generated when the rotation speed of the fan motor are not detected while the Error Decision output voltage to the fan is at its maximum.

  • Page 142: Capacity Setting Abnormality

    Troubleshooting by Remote Controller ESIE15-13B Capacity Setting Abnormality Remote Controller Display All models of indoor unit Applicable Models Capacity is determined according to resistance of the capacity setting adaptor and the memory Method of Error inside the IC memory on the indoor unit PCB, and whether the value is normal or abnormal is Detection determined.

  • Page 143: Transmission Error (Between Indoor Unit Pcb And Adaptor Pcb)

    ESIE15-13B Troubleshooting by Remote Controller Transmission Error (between Indoor Unit PCB and Adaptor PCB) Remote Controller Display FCQG Applicable Models Check the condition of transmission between indoor unit PCB (A1P) and adaptor PCB using Method of Error micro-computer. Detection When normal transmission is not conducted for certain duration (15 seconds or more). After 60 Error Decision seconds, error is display on the remote controller.
  • Page 144 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the connection of connector X70A on indoor unit Connect the connector PCB (A1P) normal? accurately.

  • Page 145: Thermistor Abnormality

    ESIE15-13B Troubleshooting by Remote Controller Thermistor Abnormality C4, C5, C9 Remote Controller Display All models of indoor unit Applicable Models The error is detected by temperature detected by thermistor. Method of Error Detection When the thermistor becomes disconnected or shorted while the unit is running. Error Decision Conditions ...

  • Page 146: Humidity Sensor System Abnormality

    Troubleshooting by Remote Controller ESIE15-13B 4.10 Humidity Sensor System Abnormality Remote Controller Display FCQG Applicable Models Even if error occurs, operation still continue. Method of Error The error is detected by humidity (output voltage) detected by humidity sensor. Detection The error is generated when the humidity sensor becomes disconnected or shorted when the Error Decision unit is running.

  • Page 147: Malfunction Of Motion Sensor / Floor Temperature Sensor

    ESIE15-13B Troubleshooting by Remote Controller 4.11 Malfunction of Motion Sensor / Floor Temperature Sensor Remote Controller Display Indoor unit: FXYFP~B Applicable Models Detect by a signal outputted from the sensor. Method of Error Detection When malfunction is detected by a signal outputted from the sensor. Error Decision Conditions ...
  • Page 148 Troubleshooting by Remote Controller ESIE15-13B Diagnosis Flowchart-1 Malfunction of motion sensor (Detailed Malfunction Code: CE-01) Is the connector X9A on the Properly connect the adapter PC board normally connector. connected? Are the connectors of the Properly connect the sensor itself normally connected? connector.
  • Page 149 ESIE15-13B Troubleshooting by Remote Controller Diagnosis Flowchart-2 Malfunction of floor temperature sensor (Detailed Malfunction Code: CE-02) Is the connector X9A on the Properly connect the adapter PC board normally connector. connected? Are the connectors of the Properly connect the sensor itself normally connected? connector.
  • Page 150 Troubleshooting by Remote Controller ESIE15-13B Diagnosis Flowchart-3 Malfunction of floor temperature sensor (Detailed Malfunction Code: CE-03) Is the connector X9A on the Properly connect the adapter PC board normally connector. connected? Are the connectors of the Properly connect the sensor itself normally connected? connector.
  • Page 151 ESIE15-13B Troubleshooting by Remote Controller Diagnosis Flowchart-4 Malfunction of floor temperature sensor (Detailed Malfunction Code: CE-04) Is the connector X9A on the Properly connect the adapter PC board normally connector. connected? Are the connectors of the Properly connect the sensor itself normally connected? connector.

  • Page 152: Remote Controller Thermistor Abnormality

    Troubleshooting by Remote Controller ESIE15-13B 4.12 Remote Controller Thermistor Abnormality Remote Controller Display All models of indoor unit Applicable Models Even if remote controller thermistor is faulty, system is possible to operate by indoor unit suction Method of Error air thermistor. Detection The error is detected by temperature of remote controller thermistor.

  • Page 153: Outdoor Unit Pcb Abnormality

    ESIE15-13B Troubleshooting by Remote Controller 4.13 Outdoor Unit PCB Abnormality Remote Controller Display RZQG Applicable Models Micro-computer checks whether E PROM is normal. Method of Error Detection When E PROM error when turning the power supply ON Error Decision Conditions ...

  • Page 154: High Pressure Abnormality (Detected By The High Pressure Switch)

    Troubleshooting by Remote Controller ESIE15-13B 4.14 High Pressure Abnormality (Detected by the High Pressure Switch) Remote Controller Display RZQG71~140 Applicable Models Method of Error [In cooling]  Detect the continuity of high pressure switch (S1PH) with the protection device circuit. Detection ...
  • Page 155 ESIE15-13B Troubleshooting by Remote Controller Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Open the stop valve. Is the stop valve open? Are the connection of the connector on PCB and the Correctly connect.

  • Page 156: Actuation Of Pressure Sensor

    Troubleshooting by Remote Controller ESIE15-13B 4.15 Actuation of Pressure Sensor Remote Controller Display RZQG Applicable Models  Detect the continuity of low pressure switch (S2PL) with the protection device circuit. Method of Error [In cooling] Detection  Detect error by the indoor unit intermediate thermistor (R3T). [In heating] ...
  • Page 157 ESIE15-13B Troubleshooting by Remote Controller Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the stop valve open? Open the stop valve. Is it in cooling operation? (In heating operation) the heat (In cooling...

  • Page 158: Compressor Motor Lock

    Troubleshooting by Remote Controller ESIE15-13B 4.16 Compressor Motor Lock Remote Controller Display RZQG Applicable Models Detect the motor lock when the compressor is energized. Method of Error Detection If the motor rotor does not rotate when the compressor is energized. Error Decision Conditions ...

  • Page 159: Outdoor Unit Fan Motor Abnormality

    ESIE15-13B Troubleshooting by Remote Controller 4.17 Outdoor Unit Fan Motor Abnormality Remote Controller Display RZQG Applicable Models Abnormality of fan motor system is detected according to the fan speed detected by hall IC Method of Error when the fan motor runs. Detection ...
  • Page 160 Troubleshooting by Remote Controller ESIE15-13B Is there any Remove the foreign matter. foreign matter around the fan? Remove the fan motor connector. Is the fan rotatable easily by Replace the fan motor. hand? CHECK 5 Check the resistance value for the fan motor.

  • Page 161: Electronic Expansion Valve Abnormality

    ESIE15-13B Troubleshooting by Remote Controller 4.18 Electronic Expansion Valve Abnormality Remote Controller Display RZQG Applicable Models  The error is detected whether the continuity of electronic expansion valve exist or not. Method of Error  The error is detected by the suction pipe superheat degree, discharge pipe superheat Detection degree and electronic expansion valve opening degree.
  • Page 162 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Turn OFF the power supply and turn the power ON again. Error is displayed again? Is the electronic expansion valve connector...
  • Page 163 ESIE15-13B Troubleshooting by Remote Controller the characteristics Replace the defective of each thermistor normal? thermistor. CHECK 1 the pressure sensor Replace the pressure sensor. characteristics normal? Actually, it is in wet operation. CHECK 7 Refer to to eliminate the causes of wet operation. Restart operation.

  • Page 164: Discharge Pipe Temperature Control

    Troubleshooting by Remote Controller ESIE15-13B 4.19 Discharge Pipe Temperature Control Remote Controller Display RZQG Applicable Models The error is detected according to the temperature detected by the discharge pipe temperature Method of Error sensor. Detection  When the discharge pipe temperature rises to an abnormally high level Error Decision ...
  • Page 165 ESIE15-13B Troubleshooting by Remote Controller Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the discharge pipe temperature Abnormality in refrigerant above the criteria? system such as refrigerant ( ∗1) shortage, faulty compressor, etc.

  • Page 166: High Pressure Switch System Abnormality

    Troubleshooting by Remote Controller ESIE15-13B 4.20 High Pressure Switch System Abnormality Remote Controller Display RZQG125, 140 Applicable Models The protection device circuit checks continuity in the high pressure switch (S1PH). Method of Error Detection When there is no continuity in the high pressure switch during compressor stops operating. Error Decision Conditions ...

  • Page 167: Low Pressure Switch System Abnormality

    ESIE15-13B Troubleshooting by Remote Controller 4.21 Low Pressure Switch System Abnormality Remote Controller Display RZQG71~140 Applicable Models Check the continuity of LPS. Method of Error Detection When there is no continuity in the LPS during compressor start operating. Error Decision Conditions ...

  • Page 168: Thermistor System Abnormality

    Troubleshooting by Remote Controller ESIE15-13B 4.22 Thermistor System Abnormality H9, J3, J5, J6, J7, J8 Remote Controller Display RZQG Applicable Models The error is detected according to the temperature detected by each individual thermistor. Method of Error Detection When thermistor is disconnected or short circuited during operation Error Decision Conditions ...

  • Page 169: Outdoor Unit Pcb Abnormality

    ESIE15-13B Troubleshooting by Remote Controller 4.23 Outdoor Unit PCB Abnormality Remote Controller Display RZQG Applicable Models  Detect error by current value during waveform output before compressor startup. Method of Error  Detect error by current sensor value during synchronized operation at the time of startup. Detection ...
  • Page 170 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the power supply Request an improvement to voltage between 180 and 220 VAC? make the power supply voltage fall within the standard range.

  • Page 171: Radiation Fin Temperature Rise

    ESIE15-13B Troubleshooting by Remote Controller 4.24 Radiation Fin Temperature Rise Remote Controller Display RZQG Applicable Models Radiation fin temperature is detected by the radiation fin thermistor. Method of Error Detection When the temperature of the inverter radiation fin rises abnormally due to faulty heat Error Decision dissipation.
  • Page 172 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Can it be considered Eliminate the cause. that the radiation fin temperature was high? (∗1) Is the connector of the radiation fin thermistor Connect correctly.

  • Page 173: Output Overcurrent Detection

    ESIE15-13B Troubleshooting by Remote Controller 4.25 Output Overcurrent Detection Remote Controller Display RZQG Applicable Models The error is detected by converting the current flowing to power transistor into voltage with CT1 Method of Error (DC current sensor). Detection When overcurrent has run to power transistor. Error Decision (Actuated even by instantaneous overcurrent) Conditions...
  • Page 174 Troubleshooting by Remote Controller ESIE15-13B CHECK 4 Continuity check in the power Replace the outdoor unit PCB. transistor (IGBT). Is the continuity normal? Turn the power ON, and then operate the test operation. Continue the Go to the other troubleshooting. Error is displayed again? operation normally.

  • Page 175: Electronic Thermal (Time Lag)

    ESIE15-13B Troubleshooting by Remote Controller 4.26 Electronic Thermal (Time Lag) Remote Controller Display RZQG Applicable Models The error is detected from the current flowing to power transistor into voltage with CT1 (DC Method of Error current sensor). Detection When compressor overload (except for when startup) is detected. Error Decision Conditions ...
  • Page 176 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the secondary current of the inverter higher Open the stop valve. Is the stop valve opened? than A (*1) for each phase? CHECK 2...

  • Page 177: Stall Prevention (Time Lag)

    ESIE15-13B Troubleshooting by Remote Controller 4.27 Stall Prevention (Time Lag) Remote Controller Display RZQG Applicable Models The error is detected by converting the current flowing to power transistor into voltage with CT1 Method of Error (DC current sensor). Detection Inverter PCB detects the disorder of position signal. When compressor overload and change of load are detected when startup Error Decision Conditions...
  • Page 178 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Check the installation conditions. Is the stop valve open? Open the stop valve. Is the difference between high and low pressure Insufficient pressure before startup not more...

  • Page 179: Transmission System Abnormality (Between Control And Inverter Pcb)

    ESIE15-13B Troubleshooting by Remote Controller 4.28 Transmission System Abnormality (between Control and Inverter PCB) Remote Controller Display RZQG Applicable Models Check whether transmission between control and inverter PCB is carried out normally. Method of Error Detection When the transmission is not carried out in a specified period of time or longer Error Decision Conditions ...

  • Page 180: Open Phase Or Power Supply Voltage Imbalance

    Troubleshooting by Remote Controller ESIE15-13B 4.29 Open Phase or Power Supply Voltage Imbalance Remote Controller Display RZQG Applicable Models The error is detected according to the voltage waveform of main circuit capacitor built in Method of Error inverter. Detection When the aforementioned voltage waveform becomes identical with the waveform of the power Error Decision supply open phase.

  • Page 181: Defective Capacity Setting

    ESIE15-13B Troubleshooting by Remote Controller 4.30 Defective Capacity Setting Remote Controller Display RZQG Applicable Models Check whether set value written in E PROM (at factory) or set value of capacity setting adaptor Method of Error (for spare) is the same as outdoor unit capacity. Detection When the set value on E PROM differs from the outdoor unit capacity or a capacity setting...

  • Page 182: Refrigerant Shortage (Alert)

    Troubleshooting by Remote Controller ESIE15-13B 4.31 Refrigerant Shortage (Alert) Remote Controller Display RZQG Applicable Models Refrigerant shortage is detected according to the electronic expansion valve opening degree Method of Error and measured temperatures and pressures. Detection (In cooling operation) Error Decision When the electronic expansion valve opens fully and low pressure is below 0.25 MPa Conditions continuously for 30 seconds.

  • Page 183: Refrigerant Shortage (Error)

    ESIE15-13B Troubleshooting by Remote Controller 4.32 Refrigerant Shortage (Error) Remote Controller Display RZQG Applicable Models (In cooling) Method of Error Detection based on difference in temperature between temperature set by remote controller and Detection indoor suction air temperature, electronic expansion valve opening degree, compressor frequency and low pressure.
  • Page 184 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. CHECK 9 Check for refrigerant shortage. the refrigerant amount Collect refrigerant and recharge proper? a proper amount of refrigerant after vacuum drying.

  • Page 185: Power Supply Voltage Abnormality

    ESIE15-13B Troubleshooting by Remote Controller 4.33 Power Supply Voltage Abnormality Remote Controller Display RZQG Applicable Models The error is detected according to the voltage of main circuit capacitor built in the inverter and Method of Error power supply voltage. Detection When the voltage of main circuit capacitor built in the inverter and power supply voltage drop or Error Decision when the power failure of several tens of ms or more is generated.
  • Page 186 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the power supply voltage between Field factors 200±10% VAC? Remove the connector for fan motor on the PCB, and operate.

  • Page 187: Transmission Error Between Indoor And Outdoor Unit

    ESIE15-13B Troubleshooting by Remote Controller 4.34 Transmission Error between Indoor and Outdoor Unit Remote Controller Display RZQG Applicable Models The error is generated when the micro-processor detects that the transmission between the Method of Error indoor and the outdoor unit is not normal over a certain amount of time. Detection When the transmission is not carried out normally over a certain amount of time.
  • Page 188 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the power supply voltage Field factor between 180 and 220 VAC? Is the HAP on outdoor Is connector not connected to unit PCB blinking? the X806A on outdoor unit PCB?
  • Page 189 ESIE15-13B Troubleshooting by Remote Controller Check the resistance value of the outdoor fan motor. Is the resistance value of the Replace the outdoor fan motor. outdoor fan motor normal? Does the fuse (F6U) Make the fuse normal. have continuity? • In case of a fuse can be replaced, replace the fuse.

  • Page 190: Transmission Error Between Remote Controller And Indoor Unit

    Troubleshooting by Remote Controller ESIE15-13B 4.35 Transmission Error Between Remote Controller and Indoor Unit Remote Controller Display All models of indoor unit Applicable Models The error is generated when the micro-computer detects that the transmission between the Method of Error indoor and the outdoor unit is not normal over a certain amount of time.

  • Page 191: Transmission Error Between Main Remote Controller And Sub Remote Controller

    ESIE15-13B Troubleshooting by Remote Controller 4.36 Transmission Error between MAIN Remote Controller and SUB Remote Controller Remote Controller Display All models of indoor units Applicable Models In case of controlling with 2- remote controller, check the system using micro-computer if signal Method of Error transmission between indoor unit and remote controller (main and sub) is normal.

  • Page 192: Field Setting Switch Abnormality

    Troubleshooting by Remote Controller ESIE15-13B 4.37 Field Setting Switch Abnormality Remote Controller Display All models of indoor unit Applicable Models Method of Error Detection Incorrect combination indoor unit and outdoor unit Error Decision Improper field setting Conditions  Defective indoor unit PCB and wrong wiring Supposed ...
  • Page 193 ESIE15-13B Troubleshooting by Remote Controller Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. the remote controllers connected to Adopt only one of the remote several indoor units? controllers. the remote controller wiring jumped Remove the jumper.

  • Page 194: Uc" Address Duplication Of Centralized Controller

    Troubleshooting by Remote Controller ESIE15-13B 4.38 “ ” Address Duplication of Centralized Controller Remote Controller Display All models of indoor unit Applicable Centralized controller Models The principal indoor unit detects the same address as that of its own on any other indoor unit. Method of Error Detection The error decision is made as soon as the abnormality aforementioned is detected.

  • Page 195: Transmission Error Between Centralized Controller And Indoor Unit

    ESIE15-13B Troubleshooting by Remote Controller 4.39 Transmission Error Between Centralized Controller and Indoor Unit Remote Controller Display All models of indoor units Applicable Centralized controller Models Schedule timer Micro-computer checks if transmission between indoor unit and centralized controller is normal. Method of Error Detection When transmission is not carried out normally for a certain amount of time...
  • Page 196 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. there any breaking and wrong wiring Make the wiring correct. of the connecting wires? the once- connected indoor unit Reset the all remote controllers equipment disconnected or the...

  • Page 197: Transmission Error Between Indoor And Outdoor Unit / Piping And Wiring Mismatch / Refrigerant Shortage

    ESIE15-13B Troubleshooting by Remote Controller 4.40 Transmission Error between Indoor and Outdoor Unit / Piping and Wiring Mismatch / Refrigerant Shortage Remote Controller Display RZQG Applicable Models Check the transmission between the indoor and outdoor units with a micro-computer when the Method of Error power turned ON.
  • Page 198 Troubleshooting by Remote Controller ESIE15-13B Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Does " " appear when the power is turned ON? The phase of inter-unit wiring between Correctly connect inter-unit the indoor and outdoor units is incorrect.

  • Page 199: Check

    ESIE15-13B Troubleshooting by Remote Controller 4.41 Check CHECK 1 Check the Thermistors Thermistors If the cause of the problem is related to the thermistors, then the thermistors should be checked prior to changing the PCB. For more information about these thermistors, see: ...
  • Page 200 Troubleshooting by Remote Controller ESIE15-13B Thermistor Resistance / Temperature Characteristics Indoor unit Thermistor Suction air thermistor Heat exchanger thermistor Intermediate heat exchanger thermistor Outdoor unit RZQG Thermistor Outdoor air thermistor Suction pipe thermistor Heat exchanger distributor pipe Intermediate heat exchanger thermistor Liquid pipe thermistor R10T Radiation fin thermistor...
  • Page 201 ESIE15-13B Troubleshooting by Remote Controller Outdoor unit RZQG Thermistor Discharge pipe thermistor T°C kΩ T°C kΩ T°C kΩ T°C kΩ T°C kΩ T°C kΩ 640.44 624.65 72.32 50.5 70.96 13.35 100.5 13.15 609.31 594.43 69.64 51.5 68.34 12.95 101.5 12.76 579.96 565.78 67.06...
  • Page 202 Troubleshooting by Remote Controller ESIE15-13B CHECK 2 Evaluation of Abnormal High Pressure Abnormally high pressure level is mostly caused by the condenser side. The following contents are provided by service engineer based on their field checks. Further, the number is listed in the order of degree of influence.
  • Page 203 ESIE15-13B Troubleshooting by Remote Controller CHECK 3 Evaluation of Abnormal Low Pressure Abnormally low pressure level is mostly caused by the evaporator side. The following contents are provided based on field checking of service engineer. Further, the number is listed in the order of degree of influence. In Cooling Operation Check items (Possible causes) Judgement...
  • Page 204 Troubleshooting by Remote Controller ESIE15-13B CHECK 4 Check for Power Transistor Judgement according to the continuity check by using an analog tester: (1) Do not touch the charged area (high voltage) for 10 minutes after turning the power supply off. (2) If you must touch such an area, make sure that the power supply voltage of power transistor is 50 V or less.
  • Page 205 ESIE15-13B Troubleshooting by Remote Controller CHECK 5 Fan Motor Signal Line (1) Turn the power supply off. (2) With the fan motor connector 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 Measurement point Judgement...
  • Page 206 Troubleshooting by Remote Controller ESIE15-13B CHECK 7 Check for Factors Causing Wet Operation Referring to the Fault Tree Analysis (FTA) shown below, identify the faulty points. Faulty crankcase heater Refrigerant dwelling Frequent starts and stops of the compressor ← Refer to Excessive refrigerant charging CHECK 8 ←...
  • Page 207 ESIE15-13B Troubleshooting by Remote Controller CHECK 8 Check for Excessive Refrigerant Charging As criteria for judging whether refrigerant is excessively charged or not, refer to the following operating conditions. <Diagnosis of excessive refrigerant charging> In cooling operation (1) Because high pressure rises due to excessive charging, overload control is carried out and capacity tends to run short.
  • Page 208 Troubleshooting by Remote Controller ESIE15-13B CHECK 9 Clogged Points Temperature differences must occur before or after the clogged points! COMP Indoor Unit Outdoor Unit Check points Check factor Causes Remedies Around Temperature  Dust Replace the electronic expansion difference  Choked moisture expansion valve.
  • Page 209 ESIE15-13B Troubleshooting by Remote Controller CHECK 10 Check for Inadequate Refrigerant As criteria for judging whether refrigerant is inadequate or not, refer to the following operating conditions. <Diagnosis of inadequate refrigerant> In cooling operation (1) As suction superheat degree increases due to refrigerant shortage, the electronic expansion valve tends to open (opens fully) in order to avoid overheat operation.
  • Page 210 Troubleshooting by Remote Controller ESIE15-13B <Diagnosis of inadequate refrigerant> In heating operation (1) As suction superheat degree increases due to refrigerant shortage, the electronic expansion valve tends to open (opens fully) to avoid overheat operation. (2) As suction superheat degree increases due to refrigerant shortage, compressor frequency decreases because suction superheat degree is controlled in order to prevent oil to the outdoor heat exchanger from being retained.

  • Page 211: Part 6 - Appendix

    ESIE15-13B Part 6 Appendix 1. Piping Diagrams..................198 1.1 RZQG-L9V1 ..................198 2. Wiring Diagrams..................199 2.1 Outdoor Unit ..................199 3. Thermodynamic characteristic of R-410A ...........200 4. Removing the switchbox ..............201 Appendix...

  • Page 212: Piping Diagrams

    Piping Diagrams ESIE15-13B 1. Piping Diagrams RZQG-L9V1 Pair application (B) Electronic expansion valve Outdoor Filter Filter PCB Cooling heat exchanger (C) Four way valve Check valve Pressure switch Pressure (low) switch (high) Indoor heat Service exchanger port Compressor Filter (5/16" Accumulator Field piping ø9.5 flare)

  • Page 213: Wiring Diagrams

    ESIE15-13B Wiring Diagrams 2. Wiring Diagrams Outdoor Unit 2.1.1 RZQG71L Printed circuit board (main) Printed circuit board BS1 ~ BS4 Push-button switch 1N 50Hz Outdoor C1 ~ C3 Capacitor 220-240V X205A DIP switch Indoor Bottom plate heater (option) BS1 BS2 BS3 BS4 GRN/YLW F1U ~ F2U Fuse...

  • Page 214: Thermodynamic Characteristic Of R-410A

    Thermodynamic characteristic of R-410A ESIE15-13B 3. Thermodynamic characteristic of R-410A DAIREP ver2.0 Temperature Specific entropy Steam pressure Density Specific heat at constant Specific enthalpy (˚C) (kPa) (kg/m pressure (kJ/kgK) (kJ/kg) (kJ/KgK) Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Appendix...

  • Page 215: Removing The Switchbox

    ESIE15-13B Removing the switchbox 4. Removing the switchbox Caution  Removing electrical components  Remove the cover screws before removing an electrical component. Not doing so may damage the refrigerant pipe.  Replace the grease on the heat sink with new grease. Not doing so may cause the PCB to fail due to insufficient cooling.

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