Panasonic U-8MF2E8 Service Manual Download Page 60

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SM830226-00̲3WAY ECO-i SYSTEM.in52 52

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Summary of Contents for U-8MF2E8

Page 1: ...2E5 S 56MF2E5 S 45MF2E5 S 36MF2E5 S 28MF2E5 S 22MF2E5 S 56MM1E5 S 45MM1E5 S 36MM1E5 S 28MM1E5 S 22MM1E5 S 56MP1E5 S 45MP1E5 S 36MP1E5 S 28MP1E5 S 22MP1E5 S 71MR1E5 S 56MR1E5 S 45MR1E5 S 36MR1E5 S 28MR1E5 S 22MR1E5 S 280ME1E5 S 224ME1E5 S 140ME1E5 S 106ME1E5 S 73ME1E5 S 56ML1E5 S 45ML1E5 S 36ML1E5 S 28ML1E5 S 56MD1E5 S 45MD1E5 S 36MD1E5 S 28MD1E5 S 22ML1E5 S 56MK1E5 S 45MK1E5 S 36MK1E5 S 56MT1E5 S ...

Page 2: ... conditions If you require help for a special problem contact our sales service outlet or your certified dealer for additional instructions In Case of Improper Installation The manufacturer shall in no way be responsible for improper installation or maintenance service including failure to follow the instructions in this document SPECIAL PRECAUTIONS WARNING When Wiring ELECTRICAL SHOCK CAN CAUSE S...

Page 3: ... other than specified type It may cause product damage burst and injury etc Ventilate the room well in the event that is refrigerant gas leaks during the installation Be careful not to allow contact of the refrigerant gas with a flame as this will cause the generation of poisonous gas Keep all tubing runs as short as possible Use the flare method for connecting tubing Apply refrigerant lubricant t...

Page 4: ... conditioner systems is on the increase because of the need for effective use of floor space individual control energy conservation by curtailing heat and carrying power etc Most importantly the multi air conditioner system is able to replenish a large amount of refrigerant compared to conventional individual air conditioners If a single unit of the multi air conditioner system is to be installed ...

Page 5: ... refrigerant only in liquid form 2 1 Since R410A is a non azeotrope recharging the refrigerant in gas form can lower performance and cause defects in the unit 2 2 Since refrigerant composition changes and performance decreases when gas leaks collect the remaining refrigerant and recharge the required total amount of new refrigerant after fixing the leak 3 Different tools required 3 1 Tool specific...

Page 6: ...he product the additional refrigerant amount charged in the field and the total refrigerant charge on the refrigerant charge label supplied with the product The filled out label must be adhered in the proximity of the product charging port e g onto the inside of the service cover 1 4 2 3 5 6 English text printed on this label is original Each language label will be sealed on this original text 1 F...

Page 7: ...w 3 2 2 Functions 3 3 3 Ordinary Display Controls and Functions 3 4 4 Monitoring Operations 3 9 5 Outdoor Unit Alarm History Monitor 3 11 6 Mode Settings 3 12 Section 4 REMOTE CONTROLLER FUNCTIONS 4 1 1 Simple Settings Function 4 2 2 Detailed Settings Function 4 4 3 Remote Controller Servicing Functions 4 17 1 Introduction 2 Selecting Outdoor Unit for Operation 3 4 5 6 7 8 Compressor Control Outpu...

Page 8: ...rm Display 5 2 2 Outdoor Unit Control Panel LED Display 5 4 3 Remote Controller Servicing Functions 5 5 4 3WAY Alarm Codes 5 7 5 Blinking Inspection Display 5 26 6 Inspection of Parts 5 28 7 Test Pin 5 29 8 Symptom Thermostat in OFF continues or cycles OFF ON too frequently 5 30 ...

Page 9: ...ut of PCB Outdoor Fan Control Indoor Units Control from the CCU Tube Refrigerant Recovery Control Oil Control 9 10 11 12 13 Defrost Control Upper Current Limitation Mode Demand control Alarm Information Backup Operation Other Functions 14 1 2 1 3 1 4 1 13 1 19 1 23 1 27 1 29 1 32 1 38 1 40 1 44 1 48 1 50 Detail setting in EEPROM of outdoor unit ...

Page 10: ...ystem address 1 System 1 30 1 Not necessary No of indoor units 1 1 52 units 1 Not necessary No of outdoor units 1 1 3 units 1 Not necessary 3 2 s o N t i n U 1 1 o N t i n U 1 o N t i n U This system can be expanded to connect a maximum of 3 outdoor units The system maximum capacity is 48 HP The CCU functions are disabled at all units except the unit that is set as unit No 1 Therefore no problems ...

Page 11: ...ing with unit No 1 This is in order to reduce the load on the power supply equipment Sub outdoor unit Unit No 2 Sub outdoor unit Unit No 3 Main outdoor unit Unit No 1 Starts after 2 seconds Starts after 3 seconds Starts after 1 second Operation starts 2 2 2 Delayed start for each system 2 3 1 Stopping of All Outdoor Units 2 3 2 Stopping of Individual Outdoor Units According to Load of Air Conditio...

Page 12: ...nditioner becomes large All heating mode or mixed cooling heating operation At least one inverter compressor operates when the system starts The other compressors operate according to those priority orders when the load of air conditioner becomes large 8 HP DC Inverter 10 HP DC Inverter 12 HP DC Inverter Constant speed 5HP 14 HP DC Inverter Constant speed 5HP 16 HP DC Inverter Constant speed 6HP T...

Page 13: ...ift for about ten seconds by the time lag of the communication between outdoor units Situation in which multiple compressors stop Delay start condition of constant speed compressor When one of the constant speed compressor mounted in the outdoor unit do not operate When all constant speed compressors mounted in the outdoor unit operate 3 3 1 Delay Start of Compressor in the Same System Depending o...

Page 14: ...ature in EEPROM on indoor unit PCB and discharge air temperature of indoor unit that is called DTo Required level has 0 to 30 phases This level becomes 31 at the test run The target temperature of indoor unit heat exchanger is decided according to the maximum required level Evaporation temperature Te Shows the lowest temperature among the temperature sensors E1 or E3 when the indoor unit heat exch...

Page 15: ... adjusted with this control It also prevents abnormal high pressure Condensation temperature area at heating operation and mixed cooling heating operation Condensation temperature area at heating operation Compressor capacity can increase Compressor capacity holds Thermostat OFF Compressor capacity decreases Tc_tgt_max Tc_tgt_min deg B area A area C area PX is usually fixed to 58 degrees If the hi...

Page 16: ...ed increasing the system condensation capacity and lowering the condensation temperature Tc The outdoor heat exchanger capacity is decreased decreasing the system condensation capacity and raising the condensation temperature Tc Condensation temperature Tc is high This occurs when both the cooling capacity heat intake and the heating capacity heat discharge are low The compressor capacity and the ...

Page 17: ...erature Tc The amount of heat discharge at the outdoor unit heat exchanger is increased increasing the heat intake at the cooling mode indoor units and lowering the evaporation temperature Te Primarily when both the evaporation temperature Te and condensation temperature Tc are low This occurs when the cooling capacity heat intake is high and the heating capacity heat discharge is low The outdoor ...

Page 18: ...r units and raising the condensation temperature Tc Primarily when both the evaporation temperature Te and condensation temperature Tc are high This occurs when the cooling capacity heat intake is low and the heating capacity heat discharge is high The outdoor heat exchanger capacity is decreased decreasing the system evaporation capacity and lowering the evaporation temperature Te The amount of h...

Page 19: ...deg 103 deg 101 deg Capacity goes down 2 0 hp Capacity goes down 1 0 hp Capacity goes down 0 5 hp Compressor capacity cannot increase Compressor capacity can increase Compressor capacity decreases 105 deg Stop If this temperature is detected at regular intervals alarm appears Low pressure 0 25 MPa 0 17 MPa Capacity goes up slowly Capacity cannot increase Capacity goes down 0 20 MPa No restriction ...

Page 20: ...er compressor goes down Frequency of inverter compressor can increase Frequency of inverter compressor cannot increase Max current 1 L Reference Inverter layout Diode Bridge Power Source IPM FN Magnet SW Noise Filter L3 L1 L2 Noise Filter IPM CM Fan Motor Compressor W U V W U V Primary CT Secondary CT When restarting after stopping by protection control the compressor capacity will increase slowly...

Page 21: ...1 MOV for heat exchanger 2 SC Circuit Electronic Control Valve Crankcase heater control 1 Crankcase heater control 2 DCV1A and DCV2A are only supplied with the type of 14HP and 16HP outdoor units DCV1A is linked to DCV1 DCV2A is linked to DCV2 They can be turned ON and OFF interactively So DCV1A and DCV2A are abbreviated onward Electrical expansion valve Crankcase heater See the basic operation li...

Page 22: ... operation The heat exchanger of outdoor unit is condenser in cooling operation This valve turns OFF when the outdoor unit is stopped This valve turns ON at stopped outdoor units when the heat exchanger at another outdoor unit is functioning as a condenser This valve turns ON for 30 seconds after the outdoor unit stops Then it turns OFF This valve turns ON when high pressure sensor detects 3 4MPa ...

Page 23: ...mal drop in compressor discharge gas temperature is detected This valve turns OFF when liquid back to the compressor is occurring Judgment of liquid back Detected suction temperature is lower than low pressure sensor temperature Difference between high pressure sensor temperature and discharge temperature of compressor is small less than 5 degrees Condenser RBV RCV LP HP Over charge condition Rece...

Page 24: ...e MOV for heat exchanger holds the pulse at 480 pulses This valve turns ON when the oil level of compressor is 2 or 1 in its own outdoor unit and the oil level of compressor is 0 in other outdoor unit This valve turns ON for 10 seconds and turns OFF for 20 seconds This operation is repeated while oil is supplied to others For more information on oil level of compressor refer to Oil Control section...

Page 25: ...g time of the inverter compressor SH control is controlled so that the difference of temperature between the liquid tube temperature and gas tube temperature should be set within the range as shown below Operation of electronic control valves during normal unit operation Heat exchanger condenser of outdoor unit Normal Condenser Maximum flow control Condenser Evaporator Stop Stop Evaporator Stop Co...

Page 26: ...SH in suction that is difference between the SCG temperature and low pressure sensor temperature is adjusted to 3 5 C 4 9 2 Discharge temperature control of compressor When the discharge temperature increases to 95 C or more MOV 4 opens to 100 pulses to cool down the compressor MOV 4 operates according to the state of the discharge temperature between 20 480 pulses This operation takes priority ov...

Page 27: ...or 10 C Ambient temperature 10 C Ambient temperature _10 C Ambient temperature _10 C Ambient temperature Condenser Evaporator Snowfall sensor control Silent mode 1 3dBA Silent mode 2 5dBA Control for fan crack prevention Fan forced mode Status of heat exchanger High static pressure mode setting Silent mode Maximum value Minimum value 16hp 12 12 13 12 12 13 7 8 8 9 14hp 12 12 13 12 12 13 7 8 8 9 12...

Page 28: ...emperature is 5 1 C or more Fan motor operates for 45 seconds and stops for 1 5 hours when ambient temperature is 0 1 5 0 C Fan motor operates for 45 seconds and stops for 1 hour when ambient temperature is 0 0 C or less To activate this function it is necessary to set it to all EEPROMs on outdoor PCBs CODE 04 Setting No Operation 0 1 2 3 Snow detection sensor is NOT connected with this unit But t...

Page 29: ...ver the capacity of the compressor decreases by road map control because of the pressure caused by the decreased fan rotational To activate this function it is necessary to set it to each outdoor unit When the setting is external input to PCB necessary this function works by short circuiting SILENT pins When the setting is external input to PCB unnecessary this function always works When the setti...

Page 30: ...r higher in the case of mixed cooling heating operation The fan mode is always increased when Maximum discharge temperature of inverter compressor in whole system High pressure sensor temperature 10 C 5 3 1 1 Fan mode is increased when the pressure sensor temperature is high and is decreased when the pressure sensor temperature is low 2 The fan mode may be decreased when symptoms of insufficient g...

Page 31: ...5 15 degrees according to operating condition 3 In case of special controls MOV performs special operation For detail refer to the section 7 Tube Refrigerant Recovery Control 8 Oil Control 9 Defrost Control MOV pulse changes to 55 for 1 minute when valve pulse continues to be 55 or more 5 minutes The purpose is to decrease the flow volume of the refrigerant so that room temperature can be detected...

Page 32: ...en the outdoor unit is stopped all valves of indoor units solenoid valve kit in the heating mode are closed Next when the cooling or heating operation is resumed the valves will be opened 2 Function when a common use solenoid valve kit is used and there are more than one 1 indoor unit in the cooling mode within the same solenoid valve kit 3 Function when a common use solenoid valve kit is used and...

Page 33: ...nit _ 25 C EEPROM setting in main outdoor unit CODE 0C Indoor unit under this control All units Mode Operation Stop Thermostat ON OFF doesn t concern changes from thermostat ON thermostat OFF or operation stopped Cooling mode Dry mode Heating mode changes from thermostat ON or thermostat OFF operation stopped Invalid DP operates for 20 minutes and stops for 2 hours DP operates for 20 minutes and s...

Page 34: ...y compressor capacity and MOV operation in the indoor unit 㩷To Cooling Discharge air temperature Preset discharge air temperature Heating Preset discharge air temperature Discharge air temperature Situation in which indoor unit stops by discharge air temperature control 㩷To 3 5deg and this condition continues 7 minutes 㩷To 2 0deg and this condition continues 20 XX minutes The above mentioned XX is...

Page 35: ...operation is finished normal operation starts at the horsepower determined by the indoor units where thermostats are ON When the horsepower of cooling thermostat ON still remains greater than that of heating thermostat ON during control mentioned above normal control is performed without stopping the compressor When the horsepower of heating thermostat ON is getting greater than that of cooling th...

Page 36: ...er than that of heating thermostat ON during control mentioned above once stop the outdoor unit after completion of control Then change the heat exchanger acting as an evaporator to a condenser and resume the operation All outdoor units operate at maximum horsepower Valves at all indoor units operate at 480 pulses Valve kits at all indoor units operate in heating mode ON status Control time Outdoo...

Page 37: ...pass via a capillary tube to the low pressure circuit The temperature detected by an oil sensor is used to determine whether it is oil warm or refrigerant cold If the low oil level 1 or 0 continues that outdoor unit oil receiving outdoor unit receives oil from operating outdoor units where the oil level is not low oil supply outdoor units whose all compressor oil levels are 2 Oil supply is perform...

Page 38: ...l for 2 minutes 4 Normal operation Whole process 1 System oil recovery control process When operating inverter compressor oil level less than 1 is counted with accumulation for up to 60 minutes All outdoor units operate at maximum horsepower Valves at all indoor units operate at a fixed pulse according to the indoor unit capacity Valve kits at all indoor units operate in cooling mode ON status Con...

Page 39: ...sor operation every 5 minutes 8 7 Indoor Unit Self Oil Recovery Control The indoor unit self oil recovery control system can only be performed by the cooling indoor units Divided into 8 groups in the order of indoor unit addresses and this oil recovery control is performed every 190 minutes with accumulated operation time per each group for 1 minute The indoor unit expansion valve is opened accord...

Page 40: ...s system uses the following 2 defrosting systems Time until next defrost permission when defrost was completed is changed according to the ambient temperature Frost detection does not occur for 10 minutes after operation starts Defrost does not begin again for 40 minutes of operation after defrost was once completed If all indoor units are stopped while defrosting or if the outdoor unit is stopped...

Page 41: ...ted for a total of 60 minutes when the compressor is operating 25 5 27 5 10 The frost detection area is located under the thick lines L2 L1 3 25 8 1 10 10 External temperature C Heat exchange liquid temperature C Defrosting operation end temperature The end temperature is different from the above detection temperature When conditions of section 9 2 and 9 3 contents are satisfied defrost control is...

Page 42: ... indoor units operate at a fixed pulse according to the indoor unit capacity Valve kits at all indoor units operate in cooling mode ON status Control time Outdoor units Electronic control valve Solenoid valve kit Fan Stop and cooling operation of indoor units will be followed by the indoor unit control system Fan and heating operation of indoor units are changed to stop All Indoor Units Minimum 1 ...

Page 43: ...ible to shorten defrost operating time 9 5 1 Start of Outdoor Unit Cycle Defrost When 1 or more connected outdoor units are satisfied with the conditions of section 9 2 and 9 3 contents defrost control is started 9 5 2 Simplified Flow of Outdoor Unit Cycle Defrost Whole process Outdoor unit cycle defrost shall be performed as the flow mentioned below 0 Normal operation 1 Outdoor unit cycle defrost...

Page 44: ...ff the refrigerant Condenser operation Normal operation Normal operation Outdoor unit cycle defrost processing E E C C C E E E E Outdoor unit delay start control Defrost group 1st Defrost group 2nd 㻿㼣㼕㼠㼏㼔㻿㼣㼕㼠㼏㼔 Control time 1 min Max 7 min 1 min Max 8 min 1 min Defrost occurs Outdoor unit s Indoor units Defrost occurs first second Mode Stop Heat exchanger Compressor Fan Heat exchanger ON or S Com...

Page 45: ...0 20 20 ON SH control SH control SH control SH control SH control SH control SH control 1 Cooling 20 20 20 20 20 20 20 2 Heating 55 55 60 60 60 60 55 20 1 Cooling 20 20 20 20 20 20 2 Heating 55 55 60 60 60 60 55 ON SC control SC control 60 60 60 60 SC control OFF 55 55 60 60 60 60 55 20 20 20 20 20 20 20 OFF 20 20 20 20 20 20 20 3 OFF 0010 0010 0010 0010 0010 0010 0010 Stop Fan Cooling Heating 001...

Page 46: ...n the upper current limitation mode Either of them is controlled by the lower current limitation Serial parallel I O must be connected in order to perform demand control The below input is received by serial parallel I O and demand control is performed The demand values can be set as needed with serial parallel I O It is able to display the present condition on the remote controller The rated curr...

Page 47: ...Unit Even if the demand control is not performed upper current limitation is restricted 10 2 Upper Current Limitation Mode hp horsepower 8 hp 10 hp 12 hp 14 hp 16 hp 140 140 140 130 130 Cooling mode Heating mode Mixed mode Cooling Heating 12 0 A 15 8 A 21 1 A 25 0 A 28 6 A 12 5 A 16 2 A 20 6 A 22 1 A 26 5 A 12 5 A 16 2 A 21 1 A 25 0 A 28 6 A ...

Page 48: ...04 Compressor 2 Constant speed F05 In this case possible causes include sensor failure and compressor overheating caused by insufficient refrigerant In this case it is possible that the discharge temperature from a different compressor unit is being detected due to an error in the installation of the discharge sensor An alarm occurs if the discharge temperature remains abnormally high above 80 C w...

Page 49: ...r current An alarm occurs when over current or lock current is detected 11 2 Current Protection hp horsepower 14 hp 16 hp Overload current A Outdoor unit 13 6 16 3 Lock current A 16 1 19 3 List of over current and lock currents Over current Lock current Alarm display Detected current H11 H12 List of Alarms hp horsepower Alarm Description Compressor 1 H03 Occurs when an open CT circuit is detected ...

Page 50: ...r poor connection to the PCB in the high pressure sensor circuit for 30 seconds or leaves the valve close When the low pressure sensor becomes an electrical open circuit or a short circuit conditions and a broken wiring short circuit or poor connection to the PCB in the low pressure sensor circuit for 30 seconds When all outdoor units stop in cooling mode and low pressure sensor detects 0 16MPa or...

Page 51: ...ils or do not connect with PCB F alarm occurs excluding discharge temperature sensor for compressor Inverter compressor and the other constant speed compressor which magnet switch is normal do not operate The constant speed compressor contains an over load relay that detects abnormal temperature Therefore there is no risk of danger 11 5 Temperature Sensor Failure The constant speed compressor cann...

Page 52: ...iled outdoor unit is completed Automatic backup mode will be canceled only when the power on outdoor unit No 1 is reset Therefore after repair work is completed be sure to check whether or not automatic backup mode has been canceled When there is one outdoor unit in the system the backup operation does not work When there are multiple outdoor units in the system the outdoor unit which contains the...

Page 53: ...n there is one outdoor unit in the system the backup operation does not work When there are multiple outdoor units in the system the outdoor unit which contains the problem stops Alarm list 2 Backup operation continues as long as the problem doesn t solve Alarm display Discharge temperature sensor failure for compressor 1 Discharge temperature sensor failure for compressor 2 Gas temperature sensor...

Page 54: ...or 1 At the SW7 switch on the PCB of the failed outdoor unit turn ON the switch for the compressor to disable and turn ON the backup switch Reduce the number of outdoor units set at outdoor unit No 1 by the number of failed outdoor units 2 At the SW7 switch on the PCB of the failed outdoor unit turn ON the switches for all compressor to disable and turn ON the backup switch 3 Close all service val...

Page 55: ...cessary Not necessary Unit No 1 2 3 All compressors in unit No 2 are bucked up Therefore the setting No of outdoor units installed on the main outdoor PCB is changed to 2 from 3 All compressors of main outdoor unit are backed up Unit No 1 Main unit CCU function Unit No 2 Sub unit Unit No 3 Sub unit All compressors in unit No 1 are bucked up Therefore the setting No of outdoor units installed on th...

Page 56: ...ting even if it is not possible to communicate with the stopped indoor units EEPROM setting in main outdoor unit CODE 23 ON ON ON ON ON OFF OFF OFF OFF OFF ON ON ON ON ON OFF OFF OFF OFF OFF ON ON ON ON ON OFF OFF OFF OFF OFF Operation continue Stopped units does not count Normal operation Error occurs Indoor unit failure 4 Setting No 3 Operation continue Indoor unit failure 3 Setting No 3 Allowed...

Page 57: ...ent Gas and Overcharge 1 Automatic cancel 2 Forced cancel Amount of refrigerant judgment requires that all outdoor units operate continuously for 30 minutes or longer This is in order to prevent incorrect adjustment of amount of refrigerant based on false detection caused by refrigerant accumulation or recovery at stopped outdoor units which is due to failures of functional elements After the judg...

Page 58: ...detail refer to 13 1 For detail refer to 10 1 23 E06 ignore function 1E Demand remote controller display 0 No demand display 1 When demand ON ready to start display P 2 When forced thermostat OFF with demand ON ready to start display Never use the DN code unlisted in the following table P Factory preset mode 2A Dew condensation prevention control of indoor unit 0 Invalid P 1 30 min 2 40 min 3 50 m...

Page 59: ...sures against smell when indoor unit cooling thermostat OFF 0 Invalid P 1 Valid A7 Validity invalidity of capacity control when cooling operation 0 Invalid P 1 Valid AC Actuation of solenoid valve kit EP closed 0 Invalid P C1 O2 output change 0 Continuously set OFF P 1 Refrigerant leak prevention normal OFF 2 Refrigerant leak prevention normal ON For detail refer to 4 7 For detail refer to 6 5 E1 ...

Page 60: ... MEMO 1 52 ...

Page 61: ...EDURES 1 Removing Panels 2 2 2 3 2 3 2 5 4 2 5 2 12 5 6 2 13 2 14 2 18 7 8 9 Discharging Compressor Oil Backup Operation Recovering Refrigerant Checking for Leakage After Repair Evacuating System Charging Compressor Oil Pumping Out Refrigerant from Outdoor Unit Compressor 2 21 ...

Page 62: ... Panels 1 Front panel removal Fig 1 Remove the front panel Be sure to turn off the power before maintenance When the power is turned off wait for 5 minutes without any work Then start working CAUTION Front panel Power outlet panel Tubing cover Front panel Fig 1 ...

Page 63: ... as indicated on the equipment and feed nitrogen gas gradually to provide pressure to the system from the low pressure outlet and collect oil in a pan or container Fig 2 The low pressure outlet port is at the Hi side of the left side A faulty outdoor unit may remain pressurized The oil outlet port employs a Schrader type push to release valve Be careful to avoid accidental oil release when using t...

Page 64: ...oil Judgment criteria for changing oil Color Odor Total acid value Hue Normal Yellowish None 0 02 or less 3 5 or less Abnormal overheat operation Brownish Smells somewhat not as strong as below over 0 06 over 4 0 Changing the oil and system cleaning with dry cores are necessary Motor burnout Brownish blackish Pungent burnt odor Changing the oil and system cleaning with dry cores are necessary It i...

Page 65: ...all the outdoor units If the power is not reset on the control PCB of the No 1 outdoor unit main unit backup operation will continue after the repairs are completed CAUTION Backup operation is intended as emergency operation until repairs are made Have repairs made as soon as possible 3 2 Manual Backup This backup operation is the conventional method of backup operation It involves disconnecting t...

Page 66: ...alve at the failed outdoor unit Collecting refrigerant in the failed outdoor unit Short circuit the vacuum application pin CN24 on the control PCB of the failed outdoor unit where the service valves are closed then turn the power ON Also disconnect the wiring between the outdoor units With the normal outdoor units operating monitor the operating condition and open close the liquid tube ser vice va...

Page 67: ...d recovery cylinder using hoses To avoid the entry of air into the refrigerant tubing carry out this connection work carefully Fig 3 For detailed procedures such as connecting the refrigerant recovery unit with the recovery cylinder and methods used for recovery follow the specific instructions that came with the refrigerant recovery unit CAUTION 5 Locate the AP Air Purge pins on the control PCB i...

Page 68: ...ant recovery procedures 1 When replacing or repairing a faulty unit let other normal indoor units run excluding indoor unit where refrigerant is recovered Modify power to permit turning off power to refrigerant recovered indoor units independently Power can independently be turned off for indoor unit where refrigerant is recovered Change controllable number of indoor units including changes in gro...

Page 69: ...it ball valve 1 If a ball valve with a service port has been provided in the indoor unit as shown in Fig 4 follow the instructions given in 2 through 6 below If the service port is instead located in the outdoor side follow the instructions in 4 2 3 Refrigerant recovery procedures 2 2 After running the unit in Cooling mode for about 5 minutes as described in 4 2 1 Cooling operation for all units f...

Page 70: ...er is unavailable short circuit the stop pin CN28 It is not necessary to recover the refrigerant from the balance tube Therefore do not operate the balance tube valve CAUTION 4 Turn off power to all equipment in the system Then pull out the RC1 connector 4P BLU CN75 on the out door control PCB in the outdoor unit for which pump down has been completed By pulling out the RC1 connector communication...

Page 71: ...ant recovery unit and refrigerant recovery cylinder Quickly connect each part to prevent air from entering the tubing 6 Check that each service valve of the gas tubes liquid tube and the balance tube for the outdoor unit has opened then perform refrigerant recovery If only a single outdoor unit is installed the balance tube is not used Therefore leave this valve closed To determine the completion ...

Page 72: ...eed nitrogen gas into the circuit until 3 8 MPa pressure is reached If it is apparent that the nitrogen gas is not entering the repaired section interrupt the feeding Short circuit the AP pins CN24 on the outdoor unit control PCB turn on power to run the outdoor unit then resume feeding nitrogen 4 Apply soapy water to the repaired part such as a newly brazed part and briefly inspect for any leakag...

Page 73: ... sensor outlets of the outdoor unit Fig 7 3 Connect the manifold gauge valves to the vacuum pump If the AP pins CN24 on the outdoor control PCB have already been short circuited step 4 is not necessary 4 Turn off power to the repaired outdoor unit and short circuit the AP Air Purge pins on the outdoor control PCB By short circuiting the AP pins and turning on power to the outdoor unit all elec tro...

Page 74: ...ers the charging tank CAUTION 1 Evacuation drying in oil charging tank With the lower side valve fully closed open the upper side valve and connect it to the vacuum pump via the manifold gauge valves as shown below Run the vacuum pump and evacuate the tank until the pressure falls to below 101kPa 755 mmHg 5 Torr for the evacuation drying After the evacuation drying is finished fully close the uppe...

Page 75: ... oil into outdoor unit Connect the lower valve to the low pressure outlet with Schrader type push to release valve in the outdoor unit to be oil charged and then connect the high pressure outlet with push to release valve to the upper valve via the manifold gauge valves at Hi pressure gauge side In addition connect the gas tube service port with push to release valve to the DPR Discharge Pressure ...

Page 76: ... air can enter After charge the necessary amount of new refrigerant by referring to the Installation Instructions that came with the outdoor unit NOTE To determine the completion of refrigerant recovery follow the instructions that came with the refrigerant recovery unit 7 2 If Outdoor Unit Has Not Been Charged with Refrigerant When a compressor has been replaced or in any other case where the out...

Page 77: ...rated amount it is not necessary to discharge the extra oil from the system For the method used for additional oil charging after compressor replacement refer to 7 1 If Refrigerant Has Already Been Charged to Outdoor Unit The oil absorbs moisture readily This work must be completed quickly CAUTION Fig 13 Model name Compressor model Q ty Pre charged amount of oil liters U 8MF2E8 U 10MF2E8 U 12MF2E8...

Page 78: ...as installing a high pressure cutout in the circuit 3 Connect the outdoor unit maintenance remote controller to the RC connector CN73 3P BLU on the out door unit control PCB of the outdoor unit to be repaired Then start a test run of all units Press and hold the CHECK button for 4 seconds or longer 4 Use the outdoor unit maintenance remote controller to check the operating status of the indoor uni...

Page 79: ...y during the backup operation by recovering the refrigerant from the outdoor unit to be repaired Measure the weight of the refrigerant and cylinder itself beforehand and provide sufficient safety measures such as installing a high pressure cutout in the circuit The hoses may be subject to internal pressure from the refrigerant inside the out door unit Check that the manifold gauge valves are fully...

Page 80: ...5 from the outdoor unit control PCB of that outdoor unit Then immediately fully close the gas tube valve on that outdoor unit Pulling out the SCT connector immediately stops all of the outdoor units 10 Connect the high pressure gauge side of the manifold gauge to the high pressure outlet port on the outdoor unit to be repaired and connect the manifold gauge to the refrigerant recovery device Be su...

Page 81: ...n resistance Minimum insulation resistance as required by generally accepted requirements is 1 M JUDGMENT START Is there burning of the failed compressor motor Follow the instructions in 2 Discharging Compressor Oil and drain the oil from all compressors in the same system Then inspect Is the color phase 4 0 or above or is a sharp odor present Go to 9 2 1 Replacing only the failed compressor Follo...

Page 82: ...arging with the same amount of new refrigerant has not been completed but no more refrigerant will enter the unit fully close the high pressure gauge valve on the manifold gauge Next turn the power OFF at the repaired outdoor unit then remove the short circuit at the AP pin CN24 Finally fully open all valves on the gas tube liquid tube and balance tube However leave the balance tube fully closed i...

Page 83: ...uit at the AP pin CN24 Finally fully open all valves on the gas tube liquid tube and balance tube However leave the balance tube fully closed if only a single outdoor unit is installed 7 If backup operation was engaged follow the instructions in 3 Backup Operation and perform backup opera tion recovery 8 If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was...

Page 84: ...nit then remove the short circuit at the AP pin CN24 Then fully open all valves on the gas tube liquid tube and balance tube However leave the balance tube fully closed if only a single outdoor unit is installed 8 If backup operation was engaged follow the instructions in 3 Backup Operation and perform backup opera tion recovery 9 If charging with an amount of new refrigerant equal to the amount o...

Page 85: ...ce port Schrader type valve of all outdoor units where dry cores will be attached then recover the refrigerant from the tubing Be sure that no air enters the tubing at this time 5 As shown in Fig 15 disconnect the tube that runs from the liquid tube valve to the ball valve on all outdoor units where dry cores will be attached Then attach the dry cores 6 At all outdoor units where dry cores are att...

Page 86: ...ot installed on the outdoor unit 1 Refer to 4 2 3 Refrigerant recovery procedures 2 Indoor unit with no ball valve equipped Perform pump down of the refrigerant from all indoor units and inter unit tubing to the outdoor unit side 2 Cut the liquid narrow tube at all outdoor units where dry cores will be attached then attach the dry cores and ball valves as shown in Fig 15 3 For the next steps refer...

Page 87: ...e service port of the gas side service valve 2 Remove the insulator that the compressor is surrounded 3 Remove the lid on the compressor terminal plate Then disconnect the power cable and discharge sensor 5 Remove the bolts 3 locations on the foot of the compressor Then remove the washers and rubber spacers 6 Remove the welded parts 3 locations as shown in the figure 7 Pull the compressor toward y...

Page 88: ...ns on the foot of the compressor Then remove the washers and rubber spacers Disconnect the tube with flare nut for the constant speed compressor Remove the crankcase heater Protect the sensors and the surrounding plates rubber lead wires clamps and other items CAUTION NOTE If oil remaining in the compressor reaches the equalized oil level oil will come pouring out Cover the tube in place with wast...

Page 89: ...ance Remote Controller 3 3 OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1 Overview 3 2 2 Functions 3 3 3 Ordinary Display Controls and Functions 3 4 4 Monitoring Operations 3 9 5 Outdoor Unit Alarm History Monitor 3 11 6 Mode Settings 3 12 ...

Page 90: ...ndoor unit connection status number of units operating mode etc NOTE Outdoor unit maintenance remote controller does not function as an ordinary remote controller It is therefore only used for test runs and during servicing L The special service checker wiring is required in order to connect the outdoor unit maintenance remote controller to the outdoor unit PCB L Ordinary remote controllers or oth...

Page 91: ...tails display No of indoor outdoor units Unit Nos of connected indoor outdoor units Indoor outdoor unit operating status blinks when an alarm occurs Indoor unit thermostat ON Display of individual outdoor unit alarms Total operating time of outdoor unit compressors Oil level of the outdoor unit oil sensor Total outdoor unit power ON time Outdoor unit microcomputer version other information N Tempe...

Page 92: ...line in the inter unit control wiring is connected it can be left as is L In case of an independent outdoor unit 1 maintenance remote controller connected to 1 outdoor unit automatic address setting for indoor units not completed both setting mode 1 and setting mode 2 can be used L The overall system status for that refrigerant system is displayed Special service checker wiring PCB connector 3P BL...

Page 93: ...he heating cooling inputs on the previous outdoor unit PCBs The display shows the operating mode of the indoor unit with the lowest unit No L All units test run Fig 2 Operation The CHECK button switches test run ON OFF for all indoor units Press and hold for 4 seconds to turn ON TEST is displayed while the test run is in progress The status of test runs that are started from the indoor unit remote...

Page 94: ...rating status of outdoor unit compressor 7 segment display Compressor 1 operating time 0 99999999 hrs Compressor 2 operating time 0 99999999 hrs Compressor 1 oil level 0 Empty 1 Insufﬁcient 2 Sufﬁcient Compressor 2 oil level 0 Empty 1 Insufﬁcient 2 Sufﬁcient Outdoor unit power ON time 0 99999999 hrs Compressor 1 operation count 0 65535 times Compressor 2 operation count 0 65535 times Alarm history...

Page 95: ...s address which is currently selected XX Outdoor system address on main bus line 1 30 YY Outdoor unit sub bus address 1 8 1 appears when there is only 1 outdoor unit LED 1 2 3 Locations where and are displayed as shown in Fig 3 01 No of connected indoor units 4 units connected Sample displays 02 Unit Nos 1 2 3 and 4 are connected Fig 3 Fig 4 Fig 5 ...

Page 96: ...ately to the next higher level even if 10 seconds have not passed N The total compressor operating time is displayed in 1 hour units using 8 digits When the ﬁrst 4 digits are displayed the bottom dot of the colon is lit Figure A When the last 4 digits are displayed the colon points are not lit Figure B The display of the ﬁrst 4 and last 4 digits changes automatically every 10 seconds It can also b...

Page 97: ...mode During temperature monitoring is lit The display and operations are the same as when monitor mode is started from the unit remote controller Press the button and select the indoor unit to monitor Use the temperature setting and buttons to select the item code of the temperature to monitor The selected indoor unit No and the temperature data are displayed To end monitoring press the CHECK butt...

Page 98: ...temp C Heat exchanger gas 1 C Heat exchanger liquid 1 C Heat exchanger gas 2 C Heat exchanger liquid 2 C Outdoor air temp C Not used Inverter primary current A CT2 A Outdoor unit MOV1 pulse STEP MOV2 pulse STEP Discharge temp 3 C CT3 A MOV3 pulse STEP MOV4 pulse STEP Heat exchanger gas 3 C Heat exchanger liquid 3 C Low pressure sensor temp C Receiver temp C Oil 1 C Oil 2 C Oil 3 C Actual operating...

Page 99: ...s appears instead of the unit No Press the button and select the outdoor unit for alarm history monitoring Use the temperature setting and buttons to select the item code for the alarm history The display shows the address of the selected outdoor unit the item code and the alarm history alarm data The outdoor unit address is displayed as R C XX YY System XX Outdoor unit system address R C XX Outdo...

Page 100: ... dot of the colon is lit To exit the setting mode press the CHECK button 1 2 3 5 5 3 1 2 A and B are displayed alternately Example shows display of 0000 0001 A Display of ﬁrst 4 digits B Display of last 4 digits DN Parameter Description Snowfall sensor usage 0 Sensor input not present Control is performed 1 Sensor input present Control is performed 2 Sensor input not present Control is not perform...

Page 101: ...et outdoor unit address System XX YY System XX System address YY Address at outdoor unit sub bus item code number DN value in the table below and the setting data 8 digits The setting data is displayed in 8 digits The display changes between the first 4 digits Fig A and the last 4 digits Fig B When the first 4 digits are displayed the bottom dot of the colon is lit To end the setting mode press th...

Page 102: ... MEMO 3 14 ...

Page 103: ...4 3WAY SYSTEM Remote Controller Functions 4 1 4 REMOTE CONTROLLER FUNCTIONS 1 Simple Settings Function 4 2 2 Detailed Settings Function 4 4 3 Remote Controller Servicing Functions 4 17 ...

Page 104: ...are displayed blinking on the remote controller LCD display Fig 1 At this time the indoor unit fan or all indoor unit fans in the case of group control begins operating If group control is in effect press the button and select the address unit No of the indoor unit to set At this time the fan at the indoor unit begins operating If unit No is displayed the same setting will be made for all indoor u...

Page 105: ...ssor OFF 0000 MED 1 min LO 3 min LO 0001 MED LO 0002 LO LO 0004 MED 1 min LO 3 min MED 0005 MED MED 0006 LO MED Heating intake temperature shift 0000 No shift 0001 Shifts intake temperature 1 C down 0002 Shifts intake temperature 2 C down 0003 Shifts intake temperature 3 C down 0004 Shifts intake temperature 4 C down 0005 Shifts intake temperature 5 C down 0006 Shifts intake temperature 6 C down E...

Page 106: ...er unit No or in the case of group control item code and settings data are displayed blinking on the remote controller LCD display Fig 2 At this time the indoor unit fan or all indoor unit fans in the case of group control begins operating If group control is in effect press the button and select the address unit No of the indoor unit to set At this time the fan at the indoor unit begins operating...

Page 107: ...n 1 and stay Without separate setting Swing Move to position 2 and stay Move to position 3 and stay Move to position 4 and stay Move to position 5 and stay 2 3 4 5 Fig 3 NOTE Setting the Flap Separately When setting the CZ RTC2 1 The 4 air outlet flap can be adjusted separately during operation When not adjusted separately all flaps operate in the same manner Procedure Stop the system before perfo...

Page 108: ...ol indoor units except for main unit Not set Cooling intake temperature shift 010 009 001 0000 0001 0009 0010 Shifts intake temperature by 10 C Shifts intake temperature by 9 C Shifts intake temperature by 1 C No intake temperature shift Shifts intake temperature by 1 C Shifts intake temperature by 9 C Shifts intake temperature by 10 C Automatic stop time after operation start 0000 0001 0002 Can b...

Page 109: ...nt 0017 17 C Lower limit 0029 29 C 0030 30 C Upper limit at shipment Upper limit Drying 0018 18 C Lower limit at shipment 0019 19 C Lower limit 0029 29 C 0030 30 C Upper limit at shipment Upper limit Auto heat cool 0017 17 C Lower limit at shipment 0018 18 C Lower limit 0026 26 C 0027 27 C Upper limit at shipment Humidiﬁer operation 0000 Normal 0001 Ignore heat exchanger temperature conditions Fil...

Page 110: ... exchanger control point for control to prevent cold air 0013 Control temperature 13 C 0014 Control temperature 14 C 0025 Control temperature 25 C 0026 Control temperature 26 C Fan output switching 0000 Output linked with fan ON when indoor unit fan is operating 0001 Fan mode operation output Drain pump delayed start time 0000 No delayed start 0001 1 sec delayed start 0002 2 sec delayed start 0058...

Page 111: ...2 sec 0058 58 sec 0059 59 sec 0060 Continuously ON Repeat timer switching 0000 Function disabled 0001 Function enabled Timer function change prohibit 0000 Function disabled 0001 Function enabled Smudging control 0000 No smudging control Setting the Flap Separately Only for 4 way Cassette type 0000 0001 0002 0003 0004 0005 0006 Setting the Flap Separately Only for 4 way Cassette type Setting the Fl...

Page 112: ...001 4 Way cassette U1 Y1 2500 1250 5000 2500 2500 1250 0002 2 Way cassette L1 2500 1250 10000 5000 2500 1250 2500 1250 0003 1 Way cassette D1 2500 1250 0005 Low Silhouette Ducted F1 F2 Slim Low Static Ducted M1 1250 5000 2500 2500 1250 5000 2500 0006 High Static Pressure Ducted E1 1250 2500 1250 5000 2500 0007 Ceiling T1 2500 1250 2500 1250 0008 Wall Mounted K1 150 75 0010 Floor Standing P1 150 75...

Page 113: ...ode from a specific remote controller When there are multiple remote controllers in the same refrigerant system it is possible to set one remote controller as the priority remote controller the remote controller which is given priority for selecting the operating mode If 2 or more remote controllers are set as priority remote controllers an alarm will occur at the remote controllers and operation ...

Page 114: ...n the heating thermostat is OFF 06 Heating intake temperature shift Shifts the intake temperature during heating Can be set when the body thermostat is used 07 Electric heater installation Set when cost distribution is performed using an AMY central control system or similar system and when an optional electric heater is installed This is unrelated to control of the electric heater 08 Humidifying ...

Page 115: ...at which an indoor unit is automatically stopped after operation starts can be set in increments of 5 minutes 1C Cooling discharge temperature shift Shifts the set value for models which perform discharge temperature control Discharge temperature control models Floor discharge wall built in direct expansion coil outdoor air treatment high fresh 1d Heating discharge temperature shift 1E Temperature...

Page 116: ...T10 terminal is used for OFF reminder or for ﬁre prevention input 31 Ventilation fan operation from remote controller It is possible to install a total heat exchanger and ventilation fan in the system which can be started and stopped by the wired remote controller The ventilation fan can operate linked with the start and stop of the indoor unit or can be operated even when the indoor unit is stopp...

Page 117: ...ap operation to draft reduction mode 46 DC ﬂap swing mode Selects the swing operation mode for the ﬂap 5d DC fan tap setting Sets the DC fan tap according to the purpose of use Change the settings data at the same time 5E Humidiﬁer ON time Sets the humidiﬁer output ON time for when the humidiﬁer is operating ON OFF control is performed during humidiﬁer operation This setting therefore sets the ON ...

Page 118: ...ect the jumper connector to the connector pin TP1 2P red on the indoor unit con trol PCB If the setting No is 3 then connect the jumper connector to the connector pin TP3 2P yellow on the indoor unit control PCB 1 Way Cassette type Procedure Be sure to turn OFF the main power source before performing the steps below Open the electrical component box cover then check the indoor unit control PCB Fig...

Page 119: ...s and hold the and buttons for 4 seconds or longer Simple settings Filter lifetime operating mode priority central control address and other settings Press and hold the and buttons for 4 seconds or longer When settings are made from a remote controller the indoor unit where that remote controller is connected stops Detailed settings System address indoor unit address central control address and ot...

Page 120: ... 4 Test Run Function Operates the unit with the thermostat forced ON Procedure Press and hold the button for 4 seconds or longer Test appears on the remote controller LCD display Fig 3 Start operation Press the button to return to normal remote controller display Fig 3 2 3 1 4 CZ RTC2 ...

Page 121: ...r to monitor For the relationships between the sensor addresses and sensor types refer to the table of temperature sensors and addresses on the next page If group control is in effect press the button to select the unit to monitor Press the temperature setting buttons to select the item code to change Press the button to return to normal remote controller display 1 2 3 4 5 Display shows a discharg...

Page 122: ...Discharge temp 2 0C 2C 4C High pressure sensor temp 0D 2D 4D Heat exchanger gas 1 0E 2E 4E Heat exchanger liquid 1 0F 2F 4F Heat exchanger gas 2 10 30 50 Heat exchanger liquid 2 Outdoor air temp For inspection 11 12 13 14 31 32 33 34 51 52 53 54 CT2 For inspection For inspection For inspection For inspection 15 16 17 18 19 1A 1B 1C 35 36 37 38 39 3A 3B 3C 55 56 57 58 59 5A 5B 5C Low pressure senso...

Page 123: ...Switch Alarm Display 5 2 2 Outdoor Unit Control Panel LED Display 5 4 3 Remote Controller Servicing Functions 5 5 4 3WAY Alarm Codes 5 7 5 Blinking Inspection Display 5 26 6 Inspection of Parts 5 28 7 Test Pin 5 29 8 Symptom Thermostat in OFF continues or cycles OFF ON too frequently 5 30 ...

Page 124: ...not correspond to number set Except R C address is 0 Error of main indoor unit in receiving serial communication signal from sub indoor units E18 Error in auto address setting Number of connected indoor units is less than the number set E15 Error in auto address setting Number of connected indoor units is more than the number set E16 No indoor unit is connected during auto address setting E20 Main...

Page 125: ...E2 Indoor coil temp sensor E3 Indoor suction air room temp sensor TA Indoor discharge air temp sensor BL Thermistor fault F01 F02 F03 F10 F11 Operating and timer lamps blinking alternately P03 P04 P02 Protective device in outdoor unit is activated Indoor unit communication error of group control wiring Abnormal device function Incorrect discharge temperature Comp No 1 Compressor thermal protector ...

Page 126: ...ss setting was completed successfully After the power is turned ON and automatic address setting is not in progress the number of detected indoor units connected to that system matches the number that was set and regular communications are occurring Both OFF Automatic address setting is in progress Blinking alternately At time of automatic address setting the number of indoor units did not match t...

Page 127: ...temperature See figure at right Press the temperature setting and buttons to change the item code to the sensor address of the sensor you wish to monitor For the relationship between the sensor address and sensor type refer to the sensor temperature relationship table on next page If group control is in effect press the button to change to the unit you wish to monitor Press the CHECK button to ret...

Page 128: ...rature E1 Indoor unit electronic expansion valve position Indoor unit heat exchanger temperature E3 Outdoor unit Unit No 1 Unit No 1 Unit No 2 Unit No 2 Unit No 3 Unit No 3 Discharge temperature 1 Discharge temperature 2 High pressure sensor temperature Heat exchanger gas 1 Heat exchanger liquid 1 Heat exchanger gas 2 Heat exchanger liquid 2 Low pressure sensor temperature Suction temp SCT Detecte...

Page 129: ...lure High pressure trouble Low pressure sensor trouble Gas temperature sensor trouble at outdoor heat exchanger 2 In Liquid temperature sensor trouble at outdoor heat exchanger 2 Out Outdoor unit non volatile memory EEPROM trouble 5 15 H01 Compressor 1 current trouble 5 15 5 16 5 16 5 17 5 17 5 18 H11 H12 H03 H05 H06 Constant speed compressor 2 overcurrent alarm Constant speed compressor 2 lock cu...

Page 130: ...dress setting was started when automatic address setting was in progress at another outdoor unit in the same link Probable cause Automatic address setting is in progress at another outdoor unit Check This alarm is not displayed on the remote controller Therefore check the blinking on the outdoor unit PCB Correction Wait for automatic address setting to be completed at the outdoor unit where it is ...

Page 131: ...ress setting again Example Notes E16 Automatic address setting alarm too many units The number of indoor units was too many when automatic address setting was performed 1 Refer to the test run servicing materials and check the number of indoor units that is set After correcting the indoor unit quantity setting or the inter unit control wiring perform automatic E20 Alarm Alarm code Alarm meaning Al...

Page 132: ...ol wiring Example Notes Recovery from this alarm occurs automatically when the set outdoor unit quantity matches the number of outdoor units detected on the inter outdoor unit control wiring E29 Alarm Alarm code E29 Alarm meaning Outdoor unit failed to receive communication from outdoor unit main Alarm conditions Outdoor unit communications from outdoor unit main were interrupted for 3 minutes or ...

Page 133: ...ature at times ﬂuctuates suddenly and wildly In some cases the precise temperature may not be known even when monitoring software is used Check Wiggle the sensor and check whether the trouble continues Check whether the connector is partially disconnected from the PCB An F04 alarm will not result if the connector is completely disconnected circuit is open If the cause is still uncertain check the ...

Page 134: ...nuous detection of a high discharge temperature then the compressor may stop for no apparent reason The purpose of this alarm is to facilitate identiﬁcation of the problem in this case F06 F23 Alarm Alarm code F06 F23 Alarm meaning Gas temperature sensor trouble at outdoor heat exchanger 1 Gas temperature sensor trouble at outdoor heat exchanger 2 Alarm conditions 1 A D step is 10 steps or less sh...

Page 135: ...le SCT Alarm conditions 1 A D step is 10 steps or less short circuit 2 A D step is 1014 steps or more open circuit Probable cause 1 Sensor malfunction including connector 2 PCB malfunction Check 1 Measure the sensor resistance Check that the sensor is operating normally 2 Use a remote controller monitor or PC monitor to check the temperature that is recognized by the microcomputer F14 Alarm Alarm ...

Page 136: ... and indoor unit heating Sudden rise in pressure at start may sometimes occur 4 Check for clogging of the refrigerant circuit 6 Outdoor unit PCB failure 5 Check for refrigerant over charging A normal PCB is needed to determine whether the problem is a PCB failure or a pressure sensor malfunction If an abnormality was found at the check items for a high pressure sensor malfunction ﬁrst try replacin...

Page 137: ... failure sudden voltage decrease 2 Operating under extremely high pressure status over loaded operation Check open closed status of the service valve of the outdoor unit 3 Check power source and voltage H01 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check Correction Example Notes H01 Compressor 1 Current trouble Compresor 1 INV primary current detected overcurrent higher than t...

Page 138: ...voltage and current 3 Trouble This alarm primarily occurs when the T phase is missing When the R phase or S phase is missing CT trouble or PCB continuity trouble occur However this may not be true in the case of a missing phase caused by magnet SW trouble Check There is the possiblility of a magnet SW failure Therefore check the phase voltage at a location that is as close to the compressor as pos...

Page 139: ...ouble It is necessary to connect a PC or other instrument Correction 1 Replace the CT circuit 2 Replace the outdoor unit PCB 3 Correct the problem Example 1 The connector was not inserted after the PCB was replaced Notes Use a normal CT as a tool to determine whether the trouble is a PCB failure or CT failure H05 H15 Alarm Alarm code H05 H15 Alarm meaning H05 Compressor 1 discharge temperature sen...

Page 140: ...nd measure the resistance between sensor No 1 and No 3 Connect a gauge to the low pressure outlet and check for changes in the value dispalyed by the monitoring software and for large deviation of the gauge pressure Resistance of less than 95k Check the open closed status of the service valve 3 Check for clogging of the refrigerant circuit When clogging in the refrigerant circuit occurs refrigeran...

Page 141: ...bnormal HIC Overcurrent in HIC circuit and the resultant abnormal heating caused by HIC failure Check the power wiring and connector wiring If the wiring and connectors are normal use a tester to measure the resistance between the compressor HIC power HIC and ground HIC If there is a short circuit there is an HIC malfunction Correction Example Notes If an HIC failure is found replace the PCB Turn ...

Page 142: ... with type E1 within only one solenoid valve kit Remote control group wiring with a different refrigerant circuit in the indoor unit In this case L11 alarm occurs at all indoor units remote controllers Check 1 1 When setting installation of common use solenoid valve kit is made by PC check whether the installation change was made in the same series of all indoor units or not Check the software of ...

Page 143: ...80 refrigerant type If the setting is incorrect change it to R410A Correction Example Notes The outdoor unit s maintenance remote controller is required in order to set the refrigerant type in the outdoor unit EEPROM P02 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check 2 Check the current transformer Put the constant speed compressor OFF over 60 minutes and cool the thermostat ...

Page 144: ... accumulated into the stopped outdoor units Trouble System is OK when all outdoor units are operating however symptoms of insufficient gas occur when a certain outdoor unit is stopped Condensation or frost is visible up to the top of the accumulator of the stopped outdoor unit After an outdoor unit stops there is the sound of refrigerant flowing into an outdoor unit that was stopped for a long tim...

Page 145: ...r the fan connector in the outdoor unit PCB is properly connected 7 During heating check whether the air filters in the indoor unit are clogged If clogged clean the filters 8 During heating check whether an air short blockage has occurred in the indoor unit The system operates normally unless the temperature around the indoor unit is excessively high 9 During heating check for indoor fan failure 1...

Page 146: ...he indoor unit 2 With the indoor unit s EEPROM setting item code 0B set to 0001 the EXCT input was shorted P16 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check Correction Example Notes P16 Compressor 1 INV overcurrent alarm This alarm occurs when current trouble or current detection trouble occur when trouble judgement current is detected in the secondary current When more than...

Page 147: ...tes If the fan does not start the below corrections may be effective Turn OFF the power and check the continuity of and on the fan circuit PCB HIC PCB for 8HP to 16HP A747038 HIC P HIC NV P29 Alarm Alarm code P29 Alarm meaning Inverter compressor missing phase or lock alarm Alarm conditions This alarm may occur at start and occurs when missing phase or lock is detected and when a DCCT failure occu...

Page 148: ... alarm P16 P22 P29 H01 H03 H11 H12 or H31 has occurred check the alarm history then refer to the corresponding items Correction Follow the instructions in the corresponding items to correct the trouble Recovery After repairing the malfunctioning locations reset the power for the system all outdoor units Caution Automatic backup mode will not be canceled until the power is reset Notes Automatic bac...

Page 149: ... remain together The conditions of magnet SW operation are poor difﬁcult to open When a magnet SW is used in a DC circuit it may be difﬁcult for the SW to open at times In an AC circuit the magnet SW should open instantaneously as long as the current is within the allowable range However this kind of trouble can occur if excessive current ﬂows and may prevent the SW from opening 2 CT circuit failu...

Page 150: ...een plug pin 5 and pins 1 through 4 at the CN63 connector 5P RED on the outdoor unit control PCB Because of the pulse output a simplified measurement method is used Set the tester to the 12 V range if the value displayed is approximately 4 V then the voltage is normal When the voltage is normal measure the resistance between each pair of pins on the electronic control valve connector The connector...

Page 151: ...Relay RY12 Relay RY13 Relay RY16 Relay RY15 Relay RY4 Relay RY6 Relay RY18 Relay RY11 Relay RY10 Relay RY8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Relay RY19 Relay RY2 Relay RY1 Relay RY17 Relay RY20 Suction valve 1 SCV1 Suction valve 2 SCV2 Discharge valve 2 DCV2 Discharge valve 1 DCV1 Bypass valve BPV Oil recovery valve ORVR Pressure balance valve 1 PBV1 Refrigerant balance valve RBV Refrigerant adj...

Page 152: ...heck alarm messages See operational status 2 2 Yes No 2 2 Discharge temperature is over 80 C in stop mode and does not decrease Connect outdoor maintenance remote controller to RC socket on outdoor unit main control PC board and check alarm messages Replace discharge temperature sensor 2 3 Yes No 2 3 Demand value always stays low Excluding 1 unlimited Connect outdoor maintenance remote controller ...

Page 153: ...201302 ...

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Panasonic U-8MF2E8, Service Manual

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