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Daikin SkyAir RZF-A Series, Service Manual

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Daikin SkyAir RZF-A Series Service Manual Download Page 150

Troubleshooting by Error Code

SiME281906E

145

Part 6 Service Diagnosis

Reference

Reference

5.16  Low Pressure Abnormality

Applicable 
Models

All outdoor unit models

Error Code

E4

Method of Error 
Detection

Cooling:

Detect errors by the indoor heat exchanger middle thermistor (R3T).

Error Decision 
Conditions

When the detection pressure is the following value;
0.12 MPa or less continues for 5 minutes
(Ref.: Equivalent saturation temperature –35°C)

Supposed 
Causes

Stop valve is not opened.

Disconnection of indoor heat exchanger middle thermistor

Defective thermistors

Defective outdoor unit main PCB

Abnormal drop of low pressure

Troubleshooting

CHECK 1

 Refer to page 192.

CHECK 3 

Refer to page 195.

Caution

Be sure to turn off the power switch before connecting or disconnecting 
connectors, or parts may be damaged.

Open the stop valve.

Is the stop valve open?

NO

Connect the connector 
properly.

NO

Replace the indoor heat 
exchanger middle thermistor.

NO

Replace the outdoor unit main 
PCB (A1P).

Is low pressure 

abnormally low?

Is it normal?

Correct the refrigerant system 
defect.

NO

YES

YES

YES

CHECK 3

Remove the thermistor from the 
indoor unit PCB and measure 
resistance.

YES

CHECK 1

Is the 

indoor heat exchanger 

middle thermistor properly 

connected to the indoor unit 

PCB?

Summary of Contents for SkyAir RZF-A Series

Page 1: ...Service Manual RZF A Series Cooling Only 50 60 Hz SiME281906E ...

Page 2: ...s 24 Part 3 Remote Controller 25 1 Applicable Models 26 1 1 Wired Remote Controller 26 1 2 Wireless Remote Controller 26 2 Names and Functions 27 2 1 BRC1E62 27 2 2 BRC1E63 29 2 3 BRC1H81 Series 31 2 4 BRC4C Series 33 3 Main Sub Setting 34 3 1 Wired Remote Controller BRC1E62 BRC1E63 34 3 2 Wired Remote Controller BRC1H81 Series 35 3 3 When Wireless Remote Controller is Used Together 36 3 4 Address...

Page 3: ...ature Control 62 4 14 Capacitor Electrical Discharge Control 63 4 15 Inverter Current Protection Control 63 4 16 Forced Thermostat OFF 63 4 17 Cooling Control with Low Outdoor Air Temperature 63 4 18 Overall Current Protection Control 64 4 19 Refrigerant Shortage Detection Control 64 4 20 Piping Wiring Mismatch Detection Control 64 4 21 Pump Down Operation 65 4 22 Oil Return Control 65 4 23 Emerge...

Page 4: ...ation 113 2 10 Equipment discharges dust 115 2 11 Defrost lamp on the receiver for wireless remote controller is blinking 116 3 Troubleshooting with LED Indications 117 3 1 Indoor Unit 117 3 2 Outdoor Unit 117 4 Troubleshooting with Remote Controller 120 4 1 BRC1E62 BRC1E63 120 4 2 BRC1H81 Series 121 4 3 BRC4C Series 122 5 Troubleshooting by Error Code 124 5 1 Error Codes and Descriptions 124 5 2 ...

Page 5: ...m 173 5 35 Refrigerant Shortage Error 174 5 36 Power Supply Voltage Abnormality 176 5 37 Transmission Error between Indoor Unit and Outdoor Unit Outdoor Fan Motor Abnormality 179 5 38 Transmission Error between Indoor Unit and Remote Controller 184 5 39 Transmission Error between Main Remote Controller and Sub Remote Controller 185 5 40 Field Setting Switch Abnormality 186 5 41 Centralized Address...

Page 6: ...E281906E 1 Introduction 1 Safety Cautions 2 1 1 Warnings and Cautions Regarding Safety of Workers 2 1 2 Warnings and Cautions Regarding Safety of Users 8 2 Icons Used 10 3 Revision History 11 Introduction ...

Page 7: ... person in charge of maintenance and inspection This appliance is filled with R 32 Warning Do not store equipment in a room with fire sources e g naked flames gas appliances electric heaters Be sure to disconnect the power cable from the socket before disassembling equipment for repair Working on equipment that is connected to the power supply may cause an electrical shock If it is necessary to su...

Page 8: ...ant system an excessively high pressure results causing equipment damage and injury Caution Do not repair electrical components with wet hands Working on the equipment with wet hands may cause an electrical shock Do not clean the air conditioner with water Washing the unit with water may cause an electrical shock Be sure to provide an earth grounding when repairing the equipment in a humid or wet ...

Page 9: ...rces including cigarette smoking should be kept at a safe distance from the site of installation repairing or removing space Before starting work the area around the equipment shall be examined to make sure that there are no flammable hazard or ignition risks No Smoking signs shall be displayed Ventilated area Ensure that the working area is open or that it is adequately ventilated before work Ade...

Page 10: ...e original specification damage to seals incorrect fitting of glands etc Ensure that the equipment is mounted securely Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the ingression of flammable atmospheres Replacement parts shall be in accordance with the manufacturer s specifications The use of silicon sealant may inhibit the effe...

Page 11: ...uit with inert gas Evacuate the inert gas Purge again with inert gas Carry out cutting or brazing of the circuit The refrigerant shall be recovered into the correct recovery cylinders The system shall be cleaned with OFN to render the unit safe Flushing This process may need to be repeated several times Compressed air or oxygen shall not be used for this task Flushing shall be achieved through bre...

Page 12: ...are labels on the equipment stating the equipment contains R 32 Refrigerant recovery When removing refrigerant from a system either for servicing or decommissioning it is recommended to conduct training so that all refrigerants can be removed safely When transferring refrigerant into cylinders ensure that only appropriate refrigerant recovery cylinders are used Ensure that the correct number of cy...

Page 13: ...able at the connection terminals Improper connections may cause excessive heat generation or fire When wiring between the indoor and outdoor units make sure that the terminal cover does not lift off or dismount because of the cable If the cover is not mounted properly the terminal connection section may cause an electrical shock excessive heat generation or fire Do not damage or modify the power c...

Page 14: ...a fire Check to see if parts and wires are mounted and connected properly and if connections at the soldered or crimped terminals are secure Improper installation and connections may cause excessive heat generation fire or an electrical shock If the installation platform or frame has corroded replace it A corroded installation platform or frame may cause the unit to fall resulting in injury Check ...

Page 15: ...ution is used when there is danger that the reader through incorrect manipulation may damage equipment lose data get an unexpected result or have to restart part of a procedure Note Note Note provides information that is not indispensable but may nevertheless be valuable to the reader such as tips and tricks Reference Reference Reference guides the reader to other places in this binder or in this ...

Page 16: ...Revision History SiME281906E 11 Introduction 3 Revision History Month Year Version Revised contents 10 2019 SiME281906E First edition ...

Page 17: ...SiME281906E Part 1 General Information 12 1 Model Names and Power Supply 13 2 External Appearance 14 3 Functions 15 4 Specifications 16 Part 1 General Information ...

Page 18: ...odel Names and Power Supply Indoor unit Outdoor unit Power supply intake Type Model name Model name Middle and high static pressure duct connection type FDMF18AVMK RZF18AVMK Outdoor unit 1 phase 220 240 V 50 60 Hz FDMF24AVMK RZF24AVMK FDMF30AVMK RZF30AVMK FDMF36AVMK RZF36AVMK ...

Page 19: ...SiME281906E External Appearance Part 1 General Information 14 2 External Appearance Indoor unit Outdoor unit FDMF A RZF18AVMK RZF24AVMK RZF30AVMK RZF36AVMK ...

Page 20: ...int range set h h Weekly schedule timer h h Off timer programmed h h On Off timer h Display automatic OFF h Backlight h h Multilingual h h Cleanliness Anti bacterial air filter h 2 h 2 h 2 Silver ion anti bacterial drain pan h h h Work servicing Drain pump mechanism h h h Pre charged h 1 h 1 h 1 Long life filter h 2 h 2 h 2 Filter sign h h h Low gas pressure detection h 1 h 1 h 1 Emergency operati...

Page 21: ...VMK Color Ivory white Ivory white Dimensions H W D mm 595 845 300 595 845 300 Coil Type Cross fin coil Cross fin coil Rows Stages Fin pitch 2 26 1 4 2 26 1 4 Face area m2 0 499 0 499 Compressor Model 2YC40AXD 2YC40AXD Type Hermetically sealed swing type Hermetically sealed swing type Motor output kW 1 3 1 3 Fan Type Propeller fan Propeller fan Motor output W 60 60 Airflow rate m3 min 45 45 Mass kg...

Page 22: ... Ivory white Ivory white Dimensions H W D mm 990 940 320 990 940 320 Coil Type Cross fin coil Cross fin coil Rows Stages Fin pitch 2 5 46 1 4 3 46 1 4 Face area m2 0 89 0 89 Compressor Model 2YC48AXD 2YC48AXD Type Hermetically sealed swing type Hermetically sealed swing type Motor output kW 1 6 1 6 Fan Type Propeller fan Propeller fan Motor output W 200 200 Airflow rate m3 min 65 65 Mass kg 60 61 ...

Page 23: ...1906E Part 2 Refrigerant Circuit 18 1 Refrigerant Circuit Piping Diagrams 19 1 1 18 24 Class 19 1 2 30 36 Class 21 2 Functional Parts Layout 23 2 1 18 24 Class 23 2 2 30 36 Class 24 Part 2 Refrigerant Circuit ...

Page 24: ...ontrol to maintain optimum operating condition for high efficiency 6 R1T Outdoor air thermistor Used for startup condition control and for overall current protection control Upper limit current depends on the outdoor air temperature 7 R2T Discharge pipe thermistor Used for discharge pipe temperature protection during compression operation 8 R3T Suction pipe thermistor Used for suction super heat c...

Page 25: ...SiME281906E Refrigerant Circuit Piping Diagrams Part 2 Refrigerant Circuit 20 Piping diagram Outdoor unit C 4D113227B R1T 6 5 Y1E 11 S1PH 4 M1C R5T 10 R4T 9 R3T 8 R2T 7 ...

Page 26: ...Used for startup condition control and for overall current protection control Upper limit current depends on the outdoor air temperature 7 R2T Discharge pipe thermistor Used for discharge pipe temperature protection during compression operation 8 R3T Suction pipe thermistor Used for suction super heat control by electronic expansion valve 9 R4T Outdoor heat exchanger liquid pipe thermistor Used fo...

Page 27: ...SiME281906E Refrigerant Circuit Piping Diagrams Part 2 Refrigerant Circuit 22 Piping diagram Outdoor unit R1T 6 R5T 10 R4T 9 R2T 7 R3T 8 4 M1C 5 Y1E R7T 11 C 3D111939B 12 S1PH ...

Page 28: ...t view Back view Electronic expansion valve Y1E Inverter fan M1F R2T Compressor M1C S1PH Thermistor Discharge pipe High pressure switch Thermistor Suction pipe R3T C 1P578063A C 1P578063A R5T Thermistor Outdoor heat exchanger middle R4T Thermistor Outdoor heat exchanger distributor pipe R1T Thermistor Outdoor air ...

Page 29: ...er fan M1F Compressor M1C C 1P578367A C 1P578290A C 1P578367A C 1P578290A R4T Thermistor Outdoor heat exchanger liquid pipe R5T Thermistor Outdoor heat exchanger middle R1T Thermistor Outdoor air R2T Thermistor Discharge pipe Y1E Electronic expansion valve S1PH High pressure switch Thermistor Suction pipe R3T ...

Page 30: ... 3 Main Sub Setting 34 3 1 Wired Remote Controller BRC1E62 BRC1E63 34 3 2 Wired Remote Controller BRC1H81 Series 35 3 3 When Wireless Remote Controller is Used Together 36 3 4 Address Setting for Wireless Remote Controller 37 4 Centralized Control Group No Setting 40 4 1 BRC1E62 BRC1E63 40 4 2 BRC1H81 Series 41 5 Service Settings Menu Maintenance Menu 42 5 1 BRC1E62 BRC1E63 42 5 2 BRC1H81 Series 4...

Page 31: ...le Models 1 1 Wired Remote Controller 1 2 Wireless Remote Controller Type Model name External appearance FDMF A BRC1E62 BRC1E63 BRC1H81W BRC1H81K BRC1H81S Type Model name External appearance Wireless remote controller Signal receiver unit FDMF A BRC4C66 BRC1E62 BRC1E63 ...

Page 32: ...e set temperature Used to highlight the item below the current selection The highlighted items will be scrolled through when the button is pressed continuously Used to change the selected item 6 Right button Used to highlight the next items on the right hand side Display contents are changed to next screen per page 7 Left button Used to highlight the next items on the left hand side Display conten...

Page 33: ...ection Menu display Confirmation of each setting On Off Cancel Operation lamp Main Menu Airflow direction Quick start Ventilation Energy saving options Schedule Filter auto clean Maintenance information Configuration Current settings Clock calendar Language Service Settings Menu Test operation Maintenance Contract Field settings Min setpoints differential Group address Indoor unit AirNet address O...

Page 34: ...rature Used to highlight the item below the current selection The highlighted items will be scrolled through when the button is pressed continuously Used to change the selected item 6 Right button Used to highlight the next items on the right hand side Display contents are changed to next screen per page 7 Left button Used to highlight the next items on the left hand side Display contents are chan...

Page 35: ...ce Menu screen Basic Screen Operation mode changeover Temperature setting Airflow rate Airflow direction Menu display Confirmation of each setting On Off Cancel Operation lamp Main Menu Circulation airflow Airflow direction Individual air direction Quick start Ventilation Energy saving options Schedule Filter auto clean Maintenance information Configuration Current settings Clock Calendar Language...

Page 36: ...djust a setting default increase For a full description of the behavior of the status indicator see the installer and user reference guide Home screens Depending on installer configuration the controller either has a standard or a detailed home screen In most cases the standard home screen gives you only the active operation mode messages if any and the setpoint temperature in case of Cooling Heat...

Page 37: ...at controller s clock is not set Self cleaning filter operation Indicates that self cleaning filter operation is active Inspection Indicates that the indoor or outdoor unit is being inspected Periodic inspection Indicates that the indoor or outdoor unit is being inspected Backup Indicates that in the system an indoor unit is set as backup indoor unit Individual airflow direction Indicates that the...

Page 38: ...op The display shows the set fan speed When the INSPECTION TEST button is pressed the display shows the system mode is in 13 14 15 16 17 TIMER RESERVE CANCEL BUTTON AIR FLOW DIRECTION ADJUST BUTTON OPERATION MODE SELECTOR BUTTON FILTER SIGN RESET BUTTON INSPECTION TEST BUTTON Press this button to select operation mode This button is used only by qualified service persons for maintenance purposes 1...

Page 39: ...isplayed on the bottom of the screen while Checking the connection Please stand by is displayed How to change Main Sub setting You may change the Main Sub setting of the remote controller while Checking the connection Please stand by is displayed by pressing and holding the Mode Selector button for 4 seconds or longer 1 It is not possible to change the Main Sub setting from Main to Sub when only o...

Page 40: ...troller that is connected to the indoor unit it will automatically get designated as master controller When using 2 remote controller For a second controller to get designated as slave controller manual action is required 1 Connect a second controller Result It will start up automatically 2 Wait for a U5 or U8 error to appear on the screen 3 When the U5 or U8 error appears press and keep it presse...

Page 41: ...ack temperature setpoints Draft prevention Duty rotation 3 3 When Wireless Remote Controller is Used Together When using both a wired and a wireless remote controller for 1 indoor unit the wired controller should be set to Main Therefore the Main Sub switch SS1 of the signal receiver PCB must be set to Sub Main Sub Main Sub Main Sub switch SS1 S M S M Transmitter assembly 1 2 3 M S SS2 SS1 The sid...

Page 42: ...e group operation For the wiring for the group operation please refer to the installation manual attached to the indoor unit and technical guide 3 4 1 Setting for Signal Receiver PCB The address for the receiver is set to 1 at the factory To change the setting set the wireless address switch SS2 on the signal receiver PCB according to the table below Unit No No 1 No 2 No 3 Wireless address switch ...

Page 43: ...d on the display 2 Press FAN button and select A or b Each time the button is pressed the display switches between A and b 3 Press UP button or DOWN button to select an address from 1 3 as same as the receiver Address can be set from 1 6 but the receiver does not work with addresses 4 6 4 Press RESERVE button to confirm the setting 5 Press INSPECTION TEST button for 1 second to return to normal mo...

Page 44: ...r operation when the functions are restricted as by an external control Other than the left A Standard factory set All items displayed Accepts the functions except restricted Sounds one long beep or three short beeps There may be a difference from the indoor unit status with remote controller display Accepts all items transmitted Sounds two short beeps The remote controller display agrees with the...

Page 45: ...played Item 2 is displayed Basic screen is displayed Press the Cancel button once Press and hold the Cancel button for 4 seconds or more Press the Cancel button once Press the Menu Enter button Select Group address and then press the Menu Enter button Press the Cancel button once Select Group Address Unit and then press the Menu Enter button Press the Cancel button once Select the desired Group No...

Page 46: ...efine groups and or units in the first level and set or release addresses for those groups and or units in the second First level Group Group A group is a group of indoor units Unit Group Unit A unit is an individual indoor unit Define the indoor unit for which you want to set an address Second level Define an address for the indoor unit To SET an address make sure is selected Apply settings To RE...

Page 47: ...n is displayed Press the Cancel button once Press the Cancel button Press and hold the Cancel button for 4 seconds or more Press and hold the Cancel button for 4 seconds or more Maintenance menu is displayed Item 2 is displayed Press the Cancel button Select the desired Unit No using the Up Down buttons The corresponding data will be displayed Select an item from Service settings menu and press Me...

Page 48: ...o Gr Addr Set Indoor unit Airnet Address Unit No Address Set Outdoor unit Airnet Address Unit No Address Set Error History RC Error History Unit No Error Date Time Up to 10 errors received by the remote controller can be displayed Indoor Unit Error History Unit No Error Date Time Up to 5 errors from the indoor unit error record can be displayed Indoor Unit Status Unit No Th1 Suction air thermistor...

Page 49: ...Fan tap Speed Fan speed rpm FLAP Airflow direction EV Degree that electronic expansion valve is open pulse MP Drain pump ON OFF EH Electric heater ON OFF Hu Humidifier ON OFF TBF Anti freezing control ON OFF FLOAT FLOAT SWITCH OPEN CLOSE T1 T2 T1 T2 external input OPEN CLOSE Th1 Suction air thermistor 1 Th2 Indoor liquid pipe thermistor Th3 Th4 Th5 Th6 Outdoor Unit Status Unit No Select the Unit N...

Page 50: ...t number you want to check Code 00 01 02 03 04 05 06 07 08 09 Remote controller thermistor C Suction air thermistor C Heat exchanger liquid pipe thermistor C Heat exchanger gas pipe thermistor C Indoor unit address No Outdoor unit address No BS unit address No Zone control address No Cooling Heating batch address No Demand low noise address No Data The corresponding data will be displayed based on...

Page 51: ...troller may display more or less icons than are indicated here From the information screen press and simultaneously and keep them pressed until you enter the installer menu Category Icon Settings Category Icon settings Screen settings Brightness Miscellaneous settings Group address and Airnet address Contrast Extremal input interlock Status indicator settings Intensity Force fan ON Field settings ...

Page 52: ... 4 6 Room Temperature Thermostat Control 57 4 7 Starting Frequency Control 57 4 8 Compressor Step Control 58 4 9 Outdoor Fan Speed Control 59 4 10 Low Noise Control 60 4 11 Low Pressure Protection Control 60 4 12 High Pressure Protection Control 61 4 13 Discharge Pipe Temperature Control 62 4 14 Capacitor Electrical Discharge Control 63 4 15 Inverter Current Protection Control 63 4 16 Forced Therm...

Page 53: ...e thermistor R3T h Float switch h Fan rotation speed h Emergency operation switch h Remote controller ON OFF switch h Airflow rate control h Thermistor Wired remote controller only h Functions and control FDMF A Reference page Set temperature and control target temperature h 51 Thermostat control h 51 Automatic airflow rate control h 52 Drain pump control h 52 Freeze up prevention control h 52 Aut...

Page 54: ... 56 Room temperature thermostat control 57 Starting frequency control 57 Function control Compressor step control 58 Outdoor fan speed control 59 Low noise control 60 Protection control Low pressure protection control 60 High pressure protection control 61 Discharge pipe temperature control 62 Capacitor electrical discharge control 63 Inverter current protection control 63 Forced thermostat off 63...

Page 55: ...sure protection control High pressure protection control Discharge pipe temperature control Inverter current protection control Cooling control with low outdoor air temperature Radiation fin temperature protection control Overall current protection control Simulated operation function Normal control Oil return control starting judgment Oil return control Oil return control ending judgment Remote c...

Page 56: ... turned ON or OFF Cooling Program Dry 1 The thermistor for room temperature detection depends on the field setting 10 20 2 2 Description of symbols Tr Detected room temperature Remote controller set temperature Tro Detected room temperature at the start of dry operation Tr Detected room temperature Remote controller set temperature Control target temperature 14 15 16 17 18 19 20 21 22 23 24 25 26 ...

Page 57: ... is determined by the difference between control target temperature and set temperature Thermostat OFF LL The fan keeps rotating at the speed as just before the thermostat off Program Dry Thermostat ON L L Thermostat OFF OFF OFF Fan Set M Stop OFF OFF H HM M ML L Fan tap Large Difference between control target Small temperature and set temperature Change in airflow rate under automatic airflow rat...

Page 58: ...ecting the power supply Stop the unit by stop commando from the remote controller or optional controller before disconnecting the power supply Be sure that the compressor and the outdoor unit fans are stopped before disconnecting the power supply so the Refrigerant Recovery function has been finished correctly When restarting the unit after the power was disconnected for a longer period leave the ...

Page 59: ...ped After restart standby until outdoor unit starts operation ON and thermostat ON OFF Outdoor unit in operation OFF min 30 seconds max 150 seconds Actuator Symbol Compressor ON Startup control In normal operation Basic control Protection control Basic control Protection control Compressor M1C Startup control Low pressure protection High pressure protection Discharge pipe temperature Inverter curr...

Page 60: ...e protection Discharge pipe temperature Inverter current protection Overall current protection Piping wiring mismatch detection control Outdoor fan M1F Oil return control Cooling control with low outdoor air temperature Indoor fan M1F Oil return control indoor fan Electronic expansion valve Y1E Electronic expansion valve control 1 Discharge pipe temperature control Remarks Item Determination Retry...

Page 61: ... Outdoor air temperature not decreasing Discharge pipe temperature 40 C Thermostat on confirmed OR 6 hours or more since power on Less than 1 hour since compressor stopped Outdoor air temperature is decreasing Discharge pipe temperature 43 C Controlled by 8 steps according to the cooling load L tap OFF Pressure equalizing start Pressure equalizing complete Startup control complete Pressure equaliz...

Page 62: ...cooling 4 7 Starting Frequency Control Outline The compressor will start up with a limited fixed frequency value for a specified period of time in order to prevent liquid back to the compressor and to limit the starting current General The normal startup control time is 2 3 minutes The maximum starting frequency control time is limited to 5 minutes OR ΔT 0 5 C continuously for 1 minute 5 minutes o...

Page 63: ...e compressor frequency using other inputs than the ones normally being used by the compressor step control function Cooling In cooling the target operation frequency will be determined by the indoor t and the evaporating temperature t Remote controller set temperature Indoor suction air temperature Depending on the cooling load the target evaporating temperature Te will be a value between 4 C Te 1...

Page 64: ... outdoor fan speed will be controlled in function of the actual outdoor air temperature the condensation pressure pressure difference between low and high pressure and compression ratio Fan step table Step RZF18 24AVMK RZF30 36AVMK 0 0 0 1 200 200 2 250 250 3 320 300 4 390 360 5 430 430 6 515 515 7 620 620 8 940 860 ...

Page 65: ...nce setting Selecting Capacity precedence setting from the field settings mode of the indoor remote controller will set capacity precedence whether in A or B operation so that low noise operation will switch to normal operation if the air conditioner load increases Canceling capacity precedence setting with low noise setting in place will give precedence to the low noise mode continuing low noise ...

Page 66: ...on Hp B MPa Compressor operation frequency 1 step 10 seconds Compressor operation frequency 1 step 1 minute Compressor operation frequency A Hz Compressor operation frequency 1 step 5 minutes Hp C p H a P M G MPa OR Hp E MPa Compressor stop Abnormal stop E3 indication 15 times or less stopping in 300 minutes Hp F MPa Stopped 16 times in 300 minutes High pressure switch is activated Hp D MPa for 1 ...

Page 67: ...ssor upper limit frequency 1 step 20 seconds Compressor upper limit frequency 1 step 90 seconds Compressor upper limit frequency H Hz Compressor stop Abnormal stop F3 indication 10 times or less stopping in 200 minutes Td B C Upper limit frequency Maximum frequency Td B C Td B C 5 minutes elapsed Td A C Td C C continues for 5 minutes 300 seconds Td E C continues for G minutes Td F C Stopped 11 tim...

Page 68: ...d thermostat OFF function in following conditions Cooling Thermostat OFF due to freeze up prevention control Based on the judgment to prevent the indoor heat exchanger from freezing the thermostat is forcedly turned OFF Refer to Freeze up Prevention Control on page 52 4 17 Cooling Control with Low Outdoor Air Temperature To ensure the compression ratio pressure difference between high and low pres...

Page 69: ...op will occur 4 20 Piping Wiring Mismatch Detection Control If the piping and transmission wiring to the outdoor unit does not match that of the connected indoor unit the remote controller will display error code UF and an abnormal stop will occur Normal operation Outdoor unit current upper limit current value Upper limit compressor operating frequency Maximum frequency Outdoor unit current upper ...

Page 70: ...equency of the compressor will be increased for a time period of 5 minutes Oil recovery operation is only executed in cooling mode 4 23 Emergency Operation Indoor outdoor transmission does not take place Cooling operation is active for 20 minutes and stopped for 10 minutes repeating this cycle Other functions take place as per normal control Procedure Precautions 1 Confirm that both the liquid and...

Page 71: ...d operation mode perform a test operation first Situation 1 Situation 2 When running in test operation mode the unit will sense on site installation parameters e g failure to open stop valves and indicate the applicable error code if required If the remote controller shows E3 E4 E5 L8 or U0 as an error code there is possibility that either the stop valve is closed or the airflow outlet is obstruct...

Page 72: ...or Outdoor Unit 79 2 Field Settings from Demand Adaptor For 30 36 Class 80 2 1 i Demand Function 80 3 Field Settings from Outdoor Unit PCB For 30 36 Class 81 3 1 Setting by BS Buttons 81 3 2 Normal Mode 83 3 3 Monitor Mode Mode 1 84 3 4 Setting Mode Mode 2 87 4 Emergency Operation 89 4 1 Forced Operation 90 4 2 Emergency Operation when the Remote Controller is Lost 91 5 Test Operation 92 5 1 Check...

Page 73: ... mode No by using Up Down button 4 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 and select indoor unit No to be set by using Up Down button In the case of group total setting this operation is not needed In the case of individual setting per indoor unit current settings are displayed And second code No means no f...

Page 74: ...ng details of the outdoor unit see installation manual attached to the outdoor unit 6 Press Menu Enter button Setting confirmation screen is displayed 7 Select Yes and press Menu Enter button Setting details are determined and field settings screen returns 8 In the case of multiple setting changes repeat 3 to 7 9 After all setting changes are completed press Cancel button twice 10 Backlight goes o...

Page 75: ...lated to the indoor unit and to the controller itself Field settings are composed of the following components Screen Field settings Indoor unit Define a mode by setting a Mode number Define the unit to which the setting will apply by setting a Unit number Define the setting by setting a SW number 1 Modes Mode 2 Units Unit 3 Settings SW 4 Values for those settings ...

Page 76: ...EST button for 4 seconds during normal mode to enter the field setting mode 2 Press the MODE button to select the desired mode No 3 Press the UP button to select the first code No 4 Press the DOWN button to select the second code No 5 Press the RESERVE button to confirm the setting 6 Press the INSPECTION TEST button to return to the normal mode RESERVE button Mode No Field setting mode UP button D...

Page 77: ...r Suction air thermistor Remote controller thermistor 74 3 Filter cleaning sign Displayed Not displayed 74 11 21 0 Setting number of the connected indoor units as simultaneous operation system Pair system 1 unit Simultaneous operation system 2 units Simultaneous operation system 3 units Double twin multi 4 units 75 1 Simultaneous operation system individual setting Unified setting Individual setti...

Page 78: ...ltaneous operation system individual setting h 2 Fan ON OFF at thermostat OFF h 7 Airflow adjustment h 12 22 1 External ON OFF input h 5 Auto restart after power failure reset h 6 Airflow setting when cooling thermostat is OFF h 13 23 6 External static pressure h 15 25 3 Drain pump humidifier interlock selection h 5 Field setting selection for individual ventilation setting by remote controller h ...

Page 79: ...n the Second Code No is set to 01 the room temperature is controlled by the suction air thermistor in the indoor unit and the remote controller thermistor as indicated in the following figure 1 5 3 Filter Cleaning Sign Whether or not to display the sign after operation of a certain duration can be selected Factory setting Setting 10 20 1 01 Long life filter 02 Ultra long life filter Filter contami...

Page 80: ...flow Setting when Cooling Thermostat is OFF as indicated in the following tables A through C in the tables indicate the contents as below A OFF for 6 minutes and then LL for 1 minute B OFF for 6 minutes and then set fan speed for 1 minute C OFF for 6 minutes and then L for 1 minute In the case of 11 21 2 01 Keep operating In the case of 11 21 2 02 Stop Mode No First Code No Second Code No Contents...

Page 81: ...of a wireless remote controller and press the ON OFF button Fan operation for automatic airflow adjustment will start with the operation lamp turned ON Do not adjust the throttle part of the suction and blow off ports during automatic adjustment After operation for approximately one to fifteen minutes airflow adjustment automatically stops with the operation lamp turned OFF 4 After operation stopp...

Page 82: ...tat is OFF This is used to set airflow to LL airflow when cooling thermostat is OFF Factory setting 1 5 11 External Static Pressure Settings Make external static pressure setting automatically using automatic airflow adjustment 11 21 7 or manually using external static pressure settings 13 23 6 Make sure that 11 21 7 Airflow adjustment is set to 01 OFF 1 FDMF30AVMK only Mode No First Code No Secon...

Page 83: ...e Remote Controller BRC1E Series Error code four digits is displayed for limited products Select two digit display if four digit display is not preferred Factory setting 1 5 15 Room Temperature Display BRC1E Series A Detailed display screen can be selected as the display screen This setting is used if you do not want to display Room temperature display on the Detailed display screen Factory settin...

Page 84: ...1 6 1 Night Time Low Noise Setting This setting allows automatic switching to low noise operation at night Start and stop times for low noise operation can also be configured 1 Change the second code number of 16 26 0 from 01 to 02 to enable night time low noise operation 2 Change the second code number of 16 26 1 and select a combination of start time and stop time if required However if the cloc...

Page 85: ...the outdoor unit PCB 3 Short circuit the contacts on the terminal X801M according to the desired demand 4 Set the dip switch DS1 if required Power supply connector on outdoor unit PCB X77A Transmission connector on outdoor unit PCB X6A Output on X801M 12 VDC 12 mA Maximum wire length 100 m 3 2 1 LNOP COM X801M 2 1 LNOP COM X80A X800M X81A DS1 ON OFF 1 2 3 4 X801M 3 Demand Maximum power consumption...

Page 86: ...cted by outdoor control or trouble by communication Setting mode Used to make changes to operating status performance settings or address setting Monitor mode Used to verify contents of settings quantity of units current value of some parameters during operation of outdoor unit Mode changing procedure can be selected using the MODE BS1 button as shown below MODE BS1 SET TEST BS2 RETURN RESET BS3 U...

Page 87: ...5 sec Normal mode Initial condition Press RETURN BS3 button once Select a setting item with the SET BS2 button Select a setting condition with the SET BS2 button Press RETURN BS3 button once Setting condition Contents display Press RETURN BS3 button once Press MODE BS1 button once Press MODE BS1 button once Select a check item with the SET BS2 button Press RETURN BS3 button once Press RETURN BS3 b...

Page 88: ... Mode 1 Indoor outdoor transmission status Used to check for the initial status of indoor outdoor transmission 2 Descriptions Used to display an error content Initializing SEG1 SEG2 SEG3 Initializing completed OFF ON Blinking Normal Error Error main code Error sub code Switching every second Example E7 01 SEG1 SEG2 SEG3 ...

Page 89: ...ON OFF Legend Segment MODE BS1 MODE BS1 RETURN BS3 RETURN BS3 SET BS2 Checking for description of data Press the SET BS2 button to set the 7 segment display to any of the monitoring items listed in the table below Press the RETURN BS3 button Data on the monitoring item selected will appear on the 7 segment display Press the MODE BS1 button will return the mode to normal mode Press the RETURN BS3 b...

Page 90: ... noise level 3 0 1 2 3 1 Display of demand operation 1 0 1 Constantly Demand level 1 Demand level 2 Demand level 3 0 1 2 3 2 Display of oil return control 1 0 2 Constantly During oil return control 0 1 4 Error content updated 1 0 4 Display of the error code and the detailed code 5 Error content previous error 1 0 5 6 Error content the one before previous 1 0 6 9 Drop factor 1 0 9 Normal In the low...

Page 91: ...not shown on the outdoor display For inspecting error code on indoor unit please consult Display of the remote controller connected to the indoor units If there are no remote controllers there should be a central control device set up Prior to start up make the necessary group number settings on each indoor unit SEG1 SEG2SEG3 Normal Normal hold 5 seconds BLINKS ON OFF Legend Segment MODE BS1 MODE ...

Page 92: ... table on the following page Press the BS3 RETURN button and decide the item The present setting condition is blinked Press the BS2 SET button and set to the setting condition you want Press the BS3 RETURN button and decide the condition Press the BS3 RETURN button and set to the initial status of Setting mode Press the BS1 MODE button to return to Normal mode If you become unsure of how to procee...

Page 93: ...on press RETURN BS3 button once Indication bold means factory setting No Item Contents Description Display Description Display SEG 1 SEG 2 SEG 3 SEG 1 SEG 2 SEG 3 3 Demand 2 operation Used to use a targeted power current level when the demand 2 control signal is inputted 2 0 3 Level 1 50 Level 2 40 Level 3 30 1 2 3 9 High dehumidification cooling Used to set high dehumidification cooling provides ...

Page 94: ...operationfor servicing SS1 switch on the indoor unit PCB h h No temperature control DIP switch on the outdoor unit PCB h 2 Test operation 1 Check operation after installation Test operation with remote controller h h h No temperature control 3 Emergency operation When wireless remote controller is lost Emergency operation switch on the indoor unit panel h h h h Remote controller is disabled Actuat...

Page 95: ...estore the switch to the original position with the power OFF When safety device is activated in emergency operation operation is stopped once and restarted in 3 minutes Step Action 1 Turn OFF the power supply 2 Flip the emergency switch DS1 1 on the indoor unit PCB from NORM Normal Factory setting to EMG Emergency 3 Set the DIP switch DS1 1 on the outdoor unit PCB to ON 4 Set the DIP switch DS1 2...

Page 96: ...e controller does not work due to battery failure or is lost use this switch which is located on the indoor unit When the remote controller does not work even though the battery low indicator is not lit contact your dealer 1 Press the emergency operation switch 2 Press the emergency operation switch again to stop operation Emergency operation switch ...

Page 97: ...pressor 3 Set up a cooling operation 4 Perform the test operation 5 Operate normally 6 Confirm function of the indoor and outdoor units according to the operation manual ITEM TO CHECK Power supply wiring Is the wiring as mentioned on the wiring diagram Make sure no wiring has been forgotten and that there are no missing phases or reverse phases Does wiring between units put in and changed in conti...

Page 98: ...e In case of already checking all equipment that not have any problem but found air conditioner not cooling Please re check Motor operate valve coil not tighten or remove for 1st checking If normally please re confirm problem following service manual to solve problem Error code Installation error Remedial action E3 E5 U0 L8 A failure of a stop valve to open Open operation of a stop valve E3 E5 L4 ...

Page 99: ...ubleshooting with LED Indications 117 3 1 Indoor Unit 117 3 2 Outdoor Unit 117 4 Troubleshooting with Remote Controller 120 4 1 BRC1E62 BRC1E63 120 4 2 BRC1H81 Series 121 4 3 BRC4C Series 122 5 Troubleshooting by Error Code 124 5 1 Error Codes and Descriptions 124 5 2 Error Codes Sub Codes 125 5 3 Error of External Protection Device 129 5 4 Indoor Unit PCB Abnormality 130 5 5 Drain Water Level Sys...

Page 100: ...ty 172 5 34 Refrigerant Shortage Warning Alarm 173 5 35 Refrigerant Shortage Error 174 5 36 Power Supply Voltage Abnormality 176 5 37 Transmission Error between Indoor Unit and Outdoor Unit Outdoor Fan Motor Abnormality 179 5 38 Transmission Error between Indoor Unit and Remote Controller 184 5 39 Transmission Error between Main Remote Controller and Sub Remote Controller 185 5 40 Field Setting Sw...

Page 101: ...rned back ON operation restarts automatically by the auto restart function Please exercise the proper caution Indoor unit Outdoor unit Refrigerant piping What about voltage and current Drain piping Earth To dedicated breaker What about switch capacity What about cable thickness Transmission wiring between indoor and outdoor units High pressure MPa Low pressure MPa Discharge pipe temperature C Suct...

Page 102: ...r Outdoor Unit Fin Fouling Higher Higher Higher Short Circuit of Outdoor Unit Inlet Outlet Air Higher Higher Higher Air Mixed in Refrigerant Higher Higher Higher Water Mixed in Refrigerant Lower 1 Lower Lower Dirt Mixed in Refrigerant Lower 2 Lower Lower Refrigerant Gas Shortage Lower Lower Lower Insufficient Compression Higher 3 Lower Lower 1 Water in the refrigerant freezes inside the capillary ...

Page 103: ...e is slightly high the fan will keep running until the temperature drops Warming up To prevent refrigerant getting into the oil the inverter will replace the compressor in providing the heating belt with voltage during the shut down period The on off of warming up is automatic and is determined by reading the air purge pipe temperature and the outdoor temperature When performing the maintenance ma...

Page 104: ... 1101 20 0 4058 10 1 1069 40 2 4783 48 0 1216 18 0 4373 12 1 1742 42 2 6014 46 0 1340 16 0 4707 14 1 2445 44 2 7292 44 0 1474 14 0 5060 16 1 3179 46 2 8616 42 0 1619 12 0 5433 18 1 3946 48 2 9989 40 0 1774 10 0 5826 20 1 4746 50 3 1412 38 0 1941 8 0 6241 22 1 5579 52 3 2887 36 0 2120 6 0 6679 24 1 6448 54 3 4415 34 0 2311 4 0 7139 26 1 7353 56 3 5997 32 0 2516 2 0 7623 28 1 8295 58 3 7635 30 0 273...

Page 105: ...rom liquid stop valve port 3 Refrigerant recovery from outdoor unit Approximately 2 3 min Recover refrigerant from outdoor unit refrigerant recovery port 1 If refrigerant recovery port 1 pressure becomes lower than gas stop valve port pressure refrigerant will be recovered simultaneously from the gas stop valve port Open gas stop valve 2 and open the gas stop valve port 3 gradually to avoid pressu...

Page 106: ...osis RZF18AVMK RZF24AVMK RZF30AVMK RZF36AVMK Liquid stop valve service port Gas stop valve service port Refrigerant recovery port Refrigerant recovery port Liquid stop valve service port Gas stop valve service port Illustration is for 30 class as representative ...

Page 107: ...ram dry mode even if compressor is not operating Normal The monitoring function forcibly operates the fan for 1 minute 12 Drain pump operates when equipment is not operating Normal The drain pump continues to operate for several minutes after equipment is turned OFF 13 Remote controller thermistor cannot be used with a group controller Normal Remote controller thermistor cannot be used in group co...

Page 108: ...it 2 2 2 Outdoor Unit Model Fuse FDMF A A1P F1U 3 15 A 250 V A2P F2U 5 0 A 250 V F4U 6 3 A 250 V Model Fuse High pressure switch RZF18 24AVMK A1P F1U 6 3 A 250 V F2U 30 A 250 V F6U 3 15 A 250 V S1PH Open 4 15 MPa Close 3 2 0 15 MPa RZF30 36AVMK A1P F1U 31 5 A 250 V F2U F3U 6 3 A 250 V F6U 5 A 250 V 0 0 15 ...

Page 109: ...ne Troubleshooting Turn ON the power switch or replace the fuse Is the power switch OFF or fuse for power switch blown YES NO Wait until power returns Inspect the indoor outdoor relay line Check that the indoor outdoor relay wiring is connected Check the indoor outdoor relay wiring phases match Check if any fuses of the outdoor unit are blown If the fuse is replaceable replace the blown fuse s If ...

Page 110: ...te standby Is the thermostat changed and reset again YES NO Diagnose based on error code on remote controller Is the operation lamp on LCD remote controller blinking YES NO Diagnose based on error code on remote controller Is the operation lamp on indoor unit signal receiving part blinking YES NO Replace the fuse F1U The fuse F1U on the outdoor unit PCB is blown YES NO Check the electric system Th...

Page 111: ...econds Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Indoor fan runs at set airflow rate In cooling When suction air temperature is higher than set temperature Replace the outdoor unit main PCB YES Replace the suction air thermistor Is the suction air thermistor operating normally NO Replace the outdoor unit main PCB Is the power...

Page 112: ...g or disconnecting connectors or parts may be damaged Diagnose based on the error code on remote controller Diagnose based on the error code on remote controller Is the type of remote controller wired or wireless Is there any item interfering airflow Wired YES Wireless NO NO YES Does the fan rotate Cooling Outdoor unit Is the operation lamp of indoor unit signal receiving part blinking YES Defecti...

Page 113: ...estarted for a while Applicable Models All models Supposed Causes Power voltage or power wire malfunction Compressor protection thermostat may act due to the following reasons Insufficient compression of compressor Incorrect refrigerant Defective electronic expansion valve Insufficient circulation of refrigerant ...

Page 114: ...ide Check on the cause why compressor protection thermostat acted NO Check the compressor Is the discharge side of compressor hot after the unit stops NO YES Contact the power company Power supply voltage is within 10 of specified voltage NO YES Replace the power cable Is the size of power cable through total length correct NO YES After vacuum drying charge correct amount of refrigerant Then start...

Page 115: ...and connections correct Additional unit installation should be considered Compressor open phase is possible Check that the wiring is correct as per the wiring diagram YES NO YES Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Wrong selection of model Effect of direct sun Refrigerant shortage possibly generates trouble After vacuum ...

Page 116: ...ooting A6 Check each item Refrigerant overcharge Air mixed in refrigerant system Soiled heat exchanger Short circuit of discharge air Disturbing item in airflow Defective fan motor of outdoor unit Refer to troubleshooting E7 Check each item Insufficient compression of compressor Insufficient circulation of refrigerant Defective electronic expansion valve NO Is the level of high pressure higher tha...

Page 117: ...than set value in cooling YES Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Normal Continue the unit operation Is white mist coming out from the unit NO Remove the source of humid condition YES Is the indoor heat exchanger soiled YES Clean the indoor heat exchanger NO NO Is the site dusty or with dense oil mist YES Remove the sou...

Page 118: ...r switch before connecting or disconnecting connectors or parts may be damaged YES Correct installation Reinforce ceilings or walls NO Does the noise generate with vibration of unit mounting section YES Insert shock absorber in mounting section or strengthen the mounting section NO NO NO NO Insert cushion materials to the pipe support such as saddle Does the fan contact with other parts Does the p...

Page 119: ... just after operation start or stop YES Normal Operation sound of draining device Continuous slight noise is generated during cooling or after operation stop YES Normal Creak generates by shrinkage of resin parts due to temperature change Creak after operation stop YES After vacuum drying charge correct amount of refrigerant Overcharge of refrigerant Air mixed in refrigerant system Flushing noise ...

Page 120: ...lected inside the indoor unit are blown out Cleaning for inside of indoor unit is necessary YES Dust collected inside the indoor unit are blown out Cleaning for inside of indoor unit is necessary Caution NO Does the trouble occur at the time of operation start again after long period of operation Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be dam...

Page 121: ... that remote controller is normal Indication appears for short time YES NO Turn the switch to Normal and reset power supply Check the unit based on troubleshooting of indoor unit LED and outdoor unit LED YES NO Trouble generates just after power supply ON Is the position of SS1 on indoor unit PCB at Emergency Caution Be sure to turn off the power switch before connecting or disconnecting connector...

Page 122: ...s or more disconnect the transmission wiring for indoor unit Then turn ON the power supply If the HAP on the outdoor unit main PCB blinks after about 10 seconds the indoor unit PCB is defective 3 Also check for open phase Remark The error history continues to indicate the previously generated error until the power supply is turned OFF Be sure to turn OFF the power supply after inspection Service m...

Page 123: ...from remote controller and seven segment display then correct the abnormality according to the installation manual operation manual or service manual After correcting the abnormality press the RETURN BS3 button and reset the error code then carry out the check again and confirm the abnormality is properly corrected The error code will not be displayed in the remote controller and seven segment dis...

Page 124: ...minal first before pulling out or plugging in connectors in order to discharge static electricity This is to prevent the PCB from being damaged 4 After confirming the main circuit capacitor voltage drop pull out the outdoor fan connector Make sure not to touch any live parts during this action Strong adverse winds which let the outdoor fan rotate induce a risk of electrical shock because the fan r...

Page 125: ... warning 2 Take corrective action Operation Status Display Abnormal shutdown The system stops operating The operation lamp green starts to blink The message Error Push Menu button will blink at the bottom of the screen Warning The system continues its operation The operation lamp green remains on The message Warning Push Menu button will blink at the bottom of the screen Press the Menu Enter butto...

Page 126: ... with an error screen from as soon as you try to enter the main menu consult your dealer 4 2 1 Refrigerant leak detection When the system detects a refrigerant leak an alarm goes off Stop the alarm and consult your dealer To stop the leak detection alarm Error screen example 1 Press for 3 seconds to stop the alarm Result The alarm stops 2 Consult your dealer ...

Page 127: ...bnormality 3 Press MODE button The left 0 upper digit indication of the error code blinks 4 Press UP button or DOWN button to change the error code upper digit until the receiver of the indoor unit starts to beep The upper digit of the code changes as shown below Continuous beep Both upper and lower digits match Error code is confirmed 2 short beeps The upper digit matches but the lower digit does...

Page 128: ...rmal mode 3 Press MODE button The upper digit blinks Normal mode 1 Press INSPECTION TEST button to enter inspection mode 7 When MODE button is pressed or no button is pressed for 1 minute equipment returns to normal mode 6 Change the lower digit with UP button or DOWN button If no button is pressed for 1 minute equipment returns to normal mode 5 Press MODE button The lower digit blinks 4 Change th...

Page 129: ...lf operating thermal protector 156 H9 Outdoor air thermistor abnormality 157 J3 Discharge pipe thermistor abnormality 157 J5 Suction pipe thermistor abnormality 157 J6 Outdoor heat exchanger distributor pipe thermistor abnormality 157 J7 Outdoor heat exchanger middle thermistor abnormality 157 J8 Outdoor heat exchanger liquid pipe thermistor abnormality 157 L1 Outdoor unit main PCB abnormality 158...

Page 130: ...any source of noise generation in the proximity C1 01 Transmission error A transmission error has been detected between the indoor unit PCB and the fan PCB Check if there is any loose connection or disconnection of transmission connectors C4 02 Heat exchanger thermistor system abnormality short circuit Short circuit of the thermistor has been detected Check for the connecting area if there is any ...

Page 131: ...gnose the appropriate PCB L8 01 Electronic thermal 1 error Overload current continues for a period of 260 seconds or more This error is supposed to have resulted from excessive charging of refrigerant damage caused to the compressor bearing too high pressure etc Check and probe the cause L8 02 Electronic thermal 2 error Overload current close to the locked current flowed in the thermal for a perio...

Page 132: ...agnose and handle this error U0 14 Refrigerant shortage Outdoor unit Cooling This error results from a shortage of refrigerant Refer to the U0 flowchart and make a diagnosis and then take countermeasures U1 01 Frequency judgment abnormality Checks for power supply frequency abnormality Check for faulty power supply wiring U2 01 Power supply voltage error This error is supposed to have resulted fro...

Page 133: ...h an incompatible indoor unit Recheck the connected model UF 01 Incorrect wiring There is an error in wire connections for transmission between indoor and outdoor units judged with the indoor unit Check for the connections of jumpers 1 2 and 3 between the indoor and outdoor units Error code Troubleshooting Description of error Diagnosis ...

Page 134: ...nal protection device Improper field setting Defective indoor unit PCB Troubleshooting Activation of external protection device External protection device is connected to terminals T1 and T2 of the indoor unit terminal block Replace the indoor unit control PCB A1P YES Change the second code No to 01 or 02 External ON OFF input mode No 12 first code No 1 has been set to external protection device i...

Page 135: ...ased either within the computer or externally and usually requires more voltage for erasure than the common 5 volts used in logic circuits It functions like non volatile RAM but writing to EEPROM is slower than writing to RAM Supposed Causes Defective indoor unit PCB External factor Noise etc Troubleshooting Replace the indoor unit PCB A1P A2P Normal reset NO Caution Switch the power OFF and ON ag...

Page 136: ...oes the drain pump work after restarting operation Is a drain pump connected to the indoor unit PCB YES YES YES Is the float switch connected to the indoor unit PCB NO NO NO NO NO YES Error is displayed again YES Within the rated voltage 1 YES NO Set to emergency and check the voltage of the connector to which the drain pump is connected X25A Connect the drain pump Drain system abnormality Connect...

Page 137: ... Clogged foreign matter Disconnection of fan motor connectors Disconnection of the connector between the indoor unit PCB and the fan PCB Defective fan PCB Defective fan motor No fuse continuity Troubleshooting Connect the connector correctly Turn OFF the power supply and wait for 10 minutes NO Turn ON the power supply while the fan motor connector 1 is disconnected YES NO Connect the connector cor...

Page 138: ...NO Replace the fan motor Each resistance between the pins is equal to or lower than 1 Ω Replace the fan motor Replace the fan PCB A2P The HAP lamp on the indoor unit control PCB is blinking while the HAP lamp on the fan PCB is not blinking YES YES Check the fan motor connectors CHECK 7 Replace the fan PCB A2P When A6 abnormality still reoccurs replace the fan motor A Model 1 Fan motor connector 2 ...

Page 139: ... Check for the indoor unit control PCB A1P and the fan PCB A2P Connect the connector correctly NO YES YES YES NO NO Is the connector X3A on the fan PCB connected correctly Connect the connector correctly NO Is the connector X70A on the indoor unit control PCB connected correctly Replace the harness YES Is the harness connecting X3A and X70A broken Remove the external factor YES Is there any extern...

Page 140: ...e of humidifier Error in the drain pipe installation Defective float switch Defective indoor unit PCB Defective connector connection Defective drain pump Troubleshooting Possible failure of float switch Check to see if drain up height and horizontal pipe length exceed specifications A humidifier unit is installed on the indoor unit Is humidifier water supply and drainage system normal Defective hu...

Page 141: ...is not connected A capacity that does not exist for that unit is set Supposed Causes Defective capacity setting adaptor connection Defective indoor unit PCB Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Replace the indoor unit control PCB A1P Replace the indoor unit control PCB A1P NO NO YES YES Install a capacity...

Page 142: ...or unit control PCB and the fan PCB using microcomputer Error Decision Conditions Error is decided when transmission between the indoor unit control PCB and the fan PCB has been lost for 15 seconds and the error code will be displayed on the remote controller 60 seconds later Supposed Causes Defective connection of the transmission connector between the indoor unit PCB and the fan PCB Defective in...

Page 143: ...the fan PCB connected correctly Connect the connector correctly NO Is the connector X10A on the fan PCB connected correctly YES NO Replace the harness YES Is the harness broken NO Remove the external factor YES Is there any external factor such as noise other than failure Normal NO Error is displayed again Turn OFF the power supply and then turn it ON again Put the unit into operation with the rem...

Page 144: ...cted wire Troubleshooting Error code and thermistor CHECK 1 Refer to page 192 Normal Defective connector connection Does it function normally Replace the indoor unit control PCB A1P Defective PCB YES Disconnect the thermistor on the PCB and connect again Disconnect the thermistor on the PCB and measure the resistance with a multimeter NO YES Replace the thermistor Defective thermistor Is it normal...

Page 145: ...tting Troubleshooting 1 Refer to Defective Capacity Setting on page 136 Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Replace it with correct fan PCB A2P Does the fan PCB A2P part No match that of the spare parts list Attach the correct capacity setting adaptor 1 Was the correct capacity setting adaptor attached when installing a...

Page 146: ...rature thermistor is disconnected or short circuited in operation The system continues operation while the error code is displayed Supposed Causes Defective remote controller thermistor Defective remote controller PCB External factor such as noise Troubleshooting 1 To delete the history the Menu Enter button of the remote controller must be pressed and held for 4 seconds in the error code display ...

Page 147: ...sed Causes Defective outdoor unit main PCB Defective fan motor External factor Noise etc Troubleshooting External factor Noise etc Does it return normally YES NO Turn the power supply OFF once and then restart Replace the outdoor unit main PCB A1P Error is displayed again Check the fan motor YES NO Turn OFF the power supply remove the fan motor connector and then turn ON the power supply again Cau...

Page 148: ...ks continuity in the high pressure switch Error Decision Conditions Cooling When the outdoor heat exchanger thermistor detects the following pressure 3 92 MPa or more continuously for 1 minute Ref Equivalent saturation temperature 62 C Error is detected when high pressure switch is activated Operating pressure 4 15 MPa Supposed Causes Dirty outdoor heat exchanger Defective outdoor fan motor Overch...

Page 149: ...he installation conditions Turn OFF the power supply Wait for 10 minutes after compressor stops operating then check the following Set the remote controller and turn ON again YES YES NO CHECK 2 Replace the high pressure switch S1PH YES Is the stop valve open Open the stop valve NO Are control and protection high pressure switch connected to outdoor unit main PCB Is there continuity in control and ...

Page 150: ...thermistor Defective thermistors Defective outdoor unit main PCB Abnormal drop of low pressure Troubleshooting CHECK 1 Refer to page 192 CHECK 3 Refer to page 195 Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Open the stop valve Is the stop valve open NO Connect the connector properly NO Replace the indoor heat exchanger middle t...

Page 151: ... energized Supposed Causes Compressor lock High pressure 2 6 MPa or more at starting Stop valve is not opened Troubleshooting Is the stop valve open NO YES Open the stop valve Is high pressure higher than 2 6 MPa at starting Check and see whether compressor is short circuited or ground NO YES Remedy the cause YES Replace the compressor Check the installation conditions Replace the compressor NO Ca...

Page 152: ...system shuts down Supposed Causes Defective fan motor The harness connector between fan motor and PCB is left in disconnected or defective connector Fan does not run due to foreign matter tangled Defective outdoor unit main PCB Blowout of fuse External factor Noise etc Troubleshooting RZF18 24AVMK Is the fan motor connector correctly connected to the outdoor unit main PCB X106A YES NO Properly con...

Page 153: ...ort circuit Replace the outdoor unit main PCB A1P also as there is a possibility of failure If the E7 error recurs even so The device is not at fault The failure may be caused by external factors such as noise Completed The outdoor unit main PCB A1P was defective If the E7 error recurs even so The device is not at fault The failure may be caused by external factors such as noise Replace the fan mo...

Page 154: ...ce the fan motor CHECK 7 Are the resistance values between pins balanced within 20 YES Replace the outdoor unit main PCB A1P The fan motor is not defective If the E7 error recurs even so The device is not at fault The failure may be caused by external factors such as noise Completed The fan motor was defective If the E7 error recurs even so The device is not at fault The failure may be caused by e...

Page 155: ...emperature indoor heat exchanger temperature Discharge pipe superheating degree Cooling Discharge pipe temperature heat exchanger middle temperature Error Decision Conditions No common power supply when the power is turned ON When the following conditions are all met Suction pipe superheating degree 4 C Discharge pipe superheating degree 5 C Electronic expansion valve opening degree is minimum Sup...

Page 156: ... the connector properly YES YES Is the electronic expansion valve connector properly connected to the outdoor unit main PCB 1 NO NO YES Replace the electronic expansion valve coil Is the coil resistance of the electronic expansion valve normal NO A Error is displayed again Mount the thermistor properly Is the thermistors suction pipe discharge pipe heat exchanger middle and outdoor heat exchanger ...

Page 157: ...age 200 Actually it is in wet operation Refer to to eliminate the causes of wet operation Restart the operation Replace the outdoor unit main PCB A1P YES Error is displayed again A External factor Noise etc NO CHECK 1 CHECK 9 YES Replace the defective thermistor Are the characteristics of each thermistor normal NO Electronic expansion valve Connector for electronic expansion valve PCB Y1E X21A A1P...

Page 158: ...there is an abnormality in the self operating thermal protector Error Decision Conditions The discharge pipe temperature rises to an abnormally high level The discharge pipe temperature rises suddenly The discharge pipe temperature does not rise after operation start Supposed Causes Defective discharge pipe thermistor Defective connection of discharge pipe thermistor connector Refrigerant shortage...

Page 159: ...c Conduct inspection Is the discharge pipe temperature higher than 110 C or the compressor self operating thermal protector temperature higher than 120 C YES Replace the discharge pipe thermistor Is the discharge pipe thermistor characteristic normal Replace the outdoor unit main PCB A1P NO YES NO Connect the thermistor correctly Is the discharge pipe thermistor correctly connected to outdoor unit...

Page 160: ...ubleshooting 1 Connector Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Connect the connector correctly Is high pressure switch connector 1 correctly connected to outdoor unit main PCB For 18 24 class Proceed to H5 troubleshooting For remaining outdoor units Replace the outdoor unit main PCB A1P NO Wait for 10 minutes after the un...

Page 161: ...ing Supposed Causes Defective outdoor unit main PCB Defective compressor self operating thermal protector Troubleshooting Properly connect the compressor self operating thermal protector Replace the compressor self operating thermal protector NO Replace the outdoor unit main PCB A1P If the error recurs replace the compressor Is the compressor self operating thermal protector open at normal tempera...

Page 162: ...n off the power switch before connecting or disconnecting connectors or parts may be damaged Connect the connector correctly Is it normal Replace the outdoor unit main PCB A1P NO Remove thermistor from outdoor unit main PCB then measure the resistance using a multimeter Check connectors for connection 1 YES Replace the defective thermistor Is it normal NO YES CHECK 1 Error Code Defective Thermisto...

Page 163: ...ime of compressor starting Current sensor error during synchronized operation Overvoltage occurs in PAM IGBT 1 error EEPROM error Supposed Causes Defective outdoor unit main PCB IPM 2 failure Current sensor failure PAM circuit failure Defective IGBT or drive circuit Inverter EEPROM failure Defective connection of compressor connector Compressor power supply open phase Defective outdoor fan motor B...

Page 164: ...xternal factor Noise etc NO Connect the lead wire tightly and correctly NO Replace the fan motor and the outdoor unit main PCB A1P The fan motor is broken by short circuit Replace the outdoor unit main PCB A1P also as there is a possibility of failure YES Replace the fuse Use only specified fuse NO NO Turn OFF the power supply Disconnect the fan motor connector and restart operation Replace the ou...

Page 165: ...tance values between pins balanced within 20 Does the fuse F6U have continuity External factor Noise etc NO Connect the lead wire tightly and correctly NO NO Replace the fuse Use only specified fuse NO NO Turn OFF the power supply Disconnect the fan motor connector and restart operation Replace the outdoor unit main PCB A1P YES YES Power ON again Replace the fan motor YES Replace the fan motor NO ...

Page 166: ... unit main PCB Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Correct the malfunction Normal Continue operation Local causes such as high outdoor air temperatures may have caused the radiation fin temperature to rise NO Check the cooling status of the radiation fin for inverter cooling 1 Is silicone grease properly...

Page 167: ... PCB Defective compressor scratched bearing The stop valve is not opened Momentary power failure Compressor noise vibration Compressor power supply open phase Troubleshooting Connect tightly and correctly Fix the open phase Is the compressor lead wire securely connected to the PCB and compressor Is there open phase NO Replace the compressor Compressor is grounded or short circuited YES Check the i...

Page 168: ...ormal mode To continue in test operation mode set the test operation mode once again 3 The unit must be run for at least 30 minutes to confirm the L5 error CHECK 4 Refer to page 196 Inspect according to the diagnosis procedure for abnormal noise vibration operating status etc of the compressor Check the power supply voltage Turn on the power and operate in test operation mode 2 YES Correct the pow...

Page 169: ...s detected by converting the current flowing to power transistor into voltage with DC current sensor Error Decision Conditions Compressor overload except for when startup is detected Supposed Causes Stop valve is not opened High pressure is too high Defective compressor wiring compressor open phase Broken compressor coil Defective outdoor unit main PCB Defective compressor scratched bearing ...

Page 170: ... the diagnosis procedure for abnormal noises vibration operating status etc of the compressor Replacement of the outdoor unit main PCB A1P is not necessary YES NO YES Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Turn the main power supply OFF NO YES Replace the outdoor unit main PCB A1P NO YES Replace the outdoor unit main PCB A...

Page 171: ...stop valve is not opened Defective wiring between compressor and inverter Defective compressor wiring compressor open phase Pressure differential startup 0 9 MPa or more Defective outdoor unit main PCB Defective compressor lock Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Open the stop valve Is the stop valve ope...

Page 172: ...tion operating status etc of the compressor Replace the outdoor unit main PCB A1P NO NO Replace the compressor Continuity check in the power transistor IGBT 1 Is the continuity normal YES Turn the main power supply OFF Disconnect the connection between the compressor and inverter YES YES The compressor is grounded and short circuited Connect tightly and correctly Fix the open phase NO Is the compr...

Page 173: ...e Supposed Causes Defective outdoor unit main PCB External factor Noise etc Defective outdoor fan motor Defective connection of fan motor connector Troubleshooting Connect the connector and turn ON again Is the fan motor connector connected properly to the outdoor unit main PCB NO YES Replace the outdoor unit main PCB A1P Disconnect the fan motor connector and turn ON again NO Replace the fan moto...

Page 174: ...uilt in inverter Error Decision Conditions The above voltage waveform fluctuation increases Supposed Causes Reactor connector detached Outdoor unit main PCB A1P malfunction PAM circuit failure Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Replace the outdoor unit main PCB A1P Reinsert the connectors correctly Are ...

Page 175: ...f main circuit capacitor built in inverter Error Decision Conditions The above voltage waveform fluctuation increases Supposed Causes Defective outdoor unit main PCB Defective main circuit capacitor Disconnection in diode module Defective magnetic relay Improper main circuit wiring Troubleshooting Replace the outdoor unit main PCB A1P Caution Be sure to turn off the power switch before connecting ...

Page 176: ...stor is detected while the compressor stops operating Supposed Causes Defective outdoor unit main PCB Defective radiation fin thermistor External factor Noise etc Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Remove the power module thermistor connector X111A on the PCB A1P and mount correctly Replace the outdoor ...

Page 177: ... the error is confirmed Error decision is made every time the power supply is turned ON Supposed Causes Outdoor unit main PCB model mistake EEPROM data is not written correctly or cannot be read Troubleshooting 1 Capacity setting adaptor is not connected at factory Capacity is written in EEPROM Capacity data for spare PCB is also written to the EEPROM so a capacity setting adapter is not required ...

Page 178: ...er middle thermistor R5T does not increase even when operation starts The temperature detected with the indoor heat exchanger thermistor R2T does not decrease even when operation starts Supposed Causes Refrigerant shortage Defective compressor wiring compressor open phase Stop valve is not opened Clogged refrigerant piping system Troubleshooting CHECK 10 Refer to page 201 Caution Be sure to turn o...

Page 179: ... are obtained under a refrigerant shortage warning 1 The evaporation temperature remains far below the target evaporation temperature The temperature detected with the outdoor heat exchanger middle thermistor R5T does not increase even when operation starts The temperature detected with the indoor heat exchanger thermistor R2T does not decrease even when operation starts 1 In test operation mode t...

Page 180: ...um drying then recharge a proper amount of refrigerant Is the refrigerant level proper Check the refrigerant piping system for clogging NO YES Check for refrigerant shortage Check the transmission wiring and piping between the indoor and outdoor units YES YES Open the stop valve Is the stop valve open NO YES Match wiring and piping connection Is wiring and piping connection matched NO Is the compr...

Page 181: ...open phase Defective outdoor unit main PCB Voltage fluctuation due to an in house generator Troubleshooting RZF18 24AVMK Correct the power supply voltage Is the power supply voltage within the normal range NO Replace the fan motor and the outdoor unit main PCB A1P The fan motor is broken by short circuit Replace the outdoor unit main PCB A1P also as there is a possibility of failure YES Caution Be...

Page 182: ... Instantaneous voltage drop Voltage fluctuation due to an in house generator YES Is the measured voltage 220 VDC or more While the compressor is running measure the voltage between C and C of power module Replace the outdoor unit main PCB A1P Connect the fan motor and operate NO YES Connect the wires correctly Are the power supply and compressor connections correct Is there open phase NO YES A CHE...

Page 183: ...nnector from the PCB and start operation Replace the fan motor Does error code U2 recur Is the fan motor operating normally Refer to E7 troubleshooting flowchart NO NO YES YES CHECK 7 Replace the outdoor unit main PCB A1P NO Monitor the voltage Instantaneous voltage drop Voltage fluctuation due to an in house generator YES Is the measured voltage 220 VDC or more While the compressor is running mea...

Page 184: ...hod of Error Detection The microcomputer detects transmission error between the indoor and the outdoor unit Error Decision Conditions The normal transmission is not conducted for a certain period of time Supposed Causes Wiring indoor outdoor transmission wire is incorrect Optional device connection malfunction Defective indoor unit PCB Defective outdoor unit main PCB Defective outdoor fan motor Ex...

Page 185: ...r for the indoor outdoor relay wiring to the terminal block detached or loose Connect the indoor outdoor relay lines correctly YES The HAP on the outdoor unit main PCB blinks rapidly 1 continuously for more than 1 minute Connect the indoor outdoor relay lines correctly Indoor outdoor relay line phases do not match YES Is there a wrong wiring disconnection loose terminal or contact failure in the t...

Page 186: ... NO Replace the indoor unit PCB External factor Noise etc External factor Noise etc Is the error code U4 displayed YES Error is displayed again NO YES After turning OFF the power supply correctly insert the connector of the fan motor and then restore the power Replace the outdoor unit main PCB A1P Check the resistance value of the outdoor fan motor A B CHECK 7 Is HAP on the outdoor unit main PCB b...

Page 187: ...r for the indoor outdoor relay wiring to the terminal block detached or loose Connect the indoor outdoor relay lines correctly YES The HAP on the outdoor unit main PCB blinks rapidly 1 continuously for more than 1 minute Connect the indoor outdoor relay lines correctly Indoor outdoor relay line phases do not match YES Is there a wrong wiring disconnection loose terminal or contact failure in the t...

Page 188: ... U4 displayed YES Error is displayed again NO YES After turning OFF the power supply correctly insert the connector of the fan motor and then restore the power Replace the outdoor unit main PCB A1P Check the resistance value of the outdoor fan motor A B CHECK 7 Is HAP on the outdoor unit main PCB blinking Replace the outdoor fan motor YES NO Turn OFF the power supply and disconnect the connector o...

Page 189: ...page 34 Set one of the remote controllers to Sub turn OFF the power supply temporarily then restart operation Main Sub setting of both remote controllers is set to Main Control by 2 remote controllers YES NO YES NO Replace the indoor unit PCB Resets normally when power supply is turned OFF temporarily All indoor unit PCB microcomputer normal monitors blinking The error could be produced by noise C...

Page 190: ...tween main remote controller and sub remote controller No main remote controller in the system Defective remote controller Troubleshooting Refer to Main Sub setting on page 34 Set the Main Sub setting of one remote controller to Main Turn OFF the power supply and restart operation Main Sub setting of one of the remote controllers is set to Main Controlling with 2 remote controllers NO NO NO YES Tu...

Page 191: ...r unit and outdoor unit combination is incorrect Field settings are not correct Supposed Causes Multiple remote controllers connected Defective indoor unit PCB Indoor outdoor indoor indoor unit transmission wiring Optional device connection malfunction Power supply PCB connection malfunction Indoor unit power supply malfunction or miswiring Miswiring between units Defective remote controller wirin...

Page 192: ...ly NO Correct the wiring Is the indoor indoor and indoor outdoor wired correctly Is there 220 240 VAC between 1 2 of terminal block X2M of indoor unit Are the service monitors HAP of all indoor unit PCB blinking NO NO NO Connect the PCB correctly YES Check the power system within the indoor unit NO NO Connect the wiring correctly Wiring could be incorrect recheck NO Replace the indoor unit PCB YES...

Page 193: ...onditions When the microcomputer judges that the centralized address signal is duplicated An error code is displayed but system operation continues Supposed Causes Defective centralized address setting Defective indoor unit PCB Troubleshooting Change the setting so that the centralized address is not duplicated Are devices relating to centralized control connected to the indoor unit Replace the in...

Page 194: ... of Error Detection Microcomputer checks if transmission between indoor unit and centralized controller is normal Error Decision Conditions Transmission is not carried out normally for a certain amount of time Supposed Causes Broken wire or wrong wiring Group No address setting error Transmission error between optional controllers for centralized controller and indoor unit Defective PCB for centra...

Page 195: ...n wire or wrong wiring found YES Make correct setting of the central control group No Replace the indoor unit PCB NO YES YES NO NO NO YES Reset the power supplies of every centralized controller Correct the wiring Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Check the transmission wiring between main centralized controller for a...

Page 196: ...Error Decision Conditions The transmission wiring between the indoor and outdoor units is incorrect Supposed Causes This is not a failure of the outdoor unit main PCB Defective transmission wiring between the indoor and outdoor units Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Correctly connect transmission wiri...

Page 197: ...at exchanger liquid pipe thermistor Type A R3T Indoor heat exchanger middle thermistor Type L Thermistor RZF18 24AVMK RZF30 36AVMK R1T Outdoor air thermistor Type M Type E R2T Discharge pipe thermistor Type G Type G R3T Suction pipe thermistor Type A Type A R4T Outdoor heat exchanger distributor pipe thermistor Type A Outdoor heat exchanger liquid pipe thermistor Type A R5T Outdoor heat exchanger ...

Page 198: ...65 6705 65 8000 5 51 05 50 9947 51 0954 10 39 91 39 9149 39 9938 15 31 44 31 4796 31 5417 20 24 95 25 0060 25 0554 25 19 94 20 0000 20 0395 30 16 04 16 1008 16 1326 35 12 99 13 0426 13 0683 40 10 58 10 6281 10 6490 45 8 669 8 7097 8 7269 50 7 143 7 1764 7 1905 55 5 918 5 9407 5 9524 60 4 928 4 9439 4 9536 65 4 123 4 1352 4 1434 70 3 467 3 4757 3 4825 75 2 9349 2 9407 80 2 4894 2 4943 85 2 1205 2 1...

Page 199: ...1 4 20 09 20 00 30 184 1 16 19 16 10 35 147 4 13 12 13 04 40 118 7 10 70 10 62 45 96 13 8 783 8 707 50 78 29 7 248 7 176 55 64 10 6 013 5 947 60 52 76 5 014 4 953 65 43 63 4 202 4 146 70 36 26 3 538 3 487 75 30 27 2 993 2 946 80 25 38 2 542 2 499 85 21 37 2 167 2 130 90 18 06 1 855 1 822 95 15 33 1 595 1 565 100 13 06 1 376 1 349 105 11 17 1 192 110 9 585 1 037 115 8 254 0 9042 120 7 131 0 7914 12...

Page 200: ...ronic expansion valve operates by noise vibration 4 Is the high pressure switch normal Check continuity by using a multimeter 5 Is the outdoor unit installed under such conditions that short circuit easily occurs Visual inspection 6 Does air enter the refrigerant system Conduct refrigerant collection and vacuum drying and then recharge proper amount refrigerant 7 Is the refrigerant overcharged Con...

Page 201: ...f the power transistor is under 50 VDC 4 After verifying the residual voltage pull out the outdoor fan motor connector If a strong wind causes the outdoor fan to rotate the capacitor may store electricity Therefore make sure that the fan is still and then pull out the outdoor fan motor connector 5 Disconnect the connection wire between the power transistor and the compressor Remove the connection ...

Page 202: ...le if there is one phase with unbalanced resistance with a value five times higher than the other values then the power transistor is defective When normal all phases have the same resistance value Multimeter Resistance Multimeter Resistance Red Black Red Black C U C U C V C V C W C W U C U C V C V C W C W C 红 Blue White Red Outdoor unit PCB Compressor ...

Page 203: ... then make sure that the resistance is more than the value mentioned in the following table RZF30 36AVMK 1 Turn the power supply OFF 2 Disconnect the fan motor connector from the PCB and measure the resistances between U V V W and W U Judgment Resistances must be balanced within 20 Measuring points Judgment 1 4 1 2 4 1 3 4 1 7 4 1 White Orange Brown Blue Red FG Vsp Vcc GND Vdc Vm 1 2 3 4 5 6 7 Red...

Page 204: ...different correct the resistance value referring to the graph below Measurement point Judgment 1 6 35 55 at 20 C 2 6 3 6 4 6 1 Orange 2 Red 3 Yellow 4 Black 5 6 Gray 1 White 2 Yellow 3 Orange 4 Blue 5 6 Red Resistance change rate 80 85 90 95 100 105 110 115 120 125 130 135 140 20 10 0 10 20 30 40 50 60 70 80 90 100 110 120 Temperature C ...

Page 205: ...door unit main PCB Defective fan motor Referring to the Fault Tree Analysis FTA shown below identify the defective points Refer to Is the heat exchanger clogged Refrigerant dwelling Excessive refrigerant charging Defectivesuperheating degreecontrol Decreased evaporation capacity Frequent starts and stops of the compressor Defectiveelectronic expansionvalve Decreased fan airflow rate Decreased fan ...

Page 206: ...tive pipe diameter due to adherent contamination etc Replace the electronic expansion valve 2 Accumulator for compressor Frosting Choked moisture Blow nitrogen gas and then replace the refrigerant 3 Distributor Temperature difference Dust Choked moisture Reduced effective pipe diameter due to adherent contamination etc Replace the heat exchanger or distributor 4 Field piping Temperature difference...

Page 207: ...her increases In addition because the compressor frequency drops to the level of the lowest frequency low pressure cannot be maintained Cooling Suction superheating degree Compressor frequency Electronic expansion valve Adequate level As compressor frequency decreases high pressure decreases Maintains a certain level of low pressure Actual high pressure Control high pressure When the refrigerant f...

Page 208: ...ncy increases in order to maintain low pressure Cooling Adequate level Maximum frequency Suction superheating degree is approx 0 deg Degree of excessive refrigerant charging As compressor frequency decreases low pressure rises Compressor frequency decreases due to high pressure protection control Minimum frequency Electronic expansion valve opening degree decreases due to wet protection control Mi...

Page 209: ...SiME281906E Part 7 Appendix 204 1 Wiring Diagrams 205 1 1 Indoor Unit 205 1 2 Outdoor Unit 206 Part 7 Appendix ...

Page 210: ...Wiring Diagrams SiME281906E 205 Part 7 Appendix 1 Wiring Diagrams 1 1 Indoor Unit FDMF18 24 30 36AVMK 3D122556A ...

Page 211: ...SiME281906E Wiring Diagrams Part 7 Appendix 206 1 2 Outdoor Unit RZF18 24AVMK 3D122453A ...

Page 212: ...Wiring Diagrams SiME281906E 207 Part 7 Appendix RZF30 36AVMK 3D122423B ...

Page 213: ...t will be used This statement does not purport to exclude restrict or modify the application of any local legislation z z Ask a qualified installer or contractor to install this product Do not try to install the product yourself Improper installation can result in water or refrigerant leakage electrical shock fire or explosion z z Use only those parts and accessories supplied or specified by Daiki...

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