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Mitsubishi Heavy Industries SRC25ZXA-S Technical Manual Download Page 50

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 49 

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 '14 • SRK-T-170

②

 Stop data

Remote control setting

Fan speed

switching

Operation

switching

Displayed data

Temperature

setting

21ºC
22ºC
23ºC
24ºC
25ºC
26ºC
27ºC
28ºC
29ºC
30ºC

Displays the reason for the stop (stop code) the previous time when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 2 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 3 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 4 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 5 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 6 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 7 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 8 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 9 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 10 times previous when the air conditioner was stopped by protective stop control.

Cooling

LO

Summary of Contents for SRC25ZXA-S

Page 1: ...L AIR CONDITIONERS Split system air to air heat pump type SRK25ZXA S SRC25ZXA S SRK25ZXA SB SRC25ZXA S SRK25ZXA SS SRC25ZXA S SRK25ZXA SR SRC25ZXA S SRK35ZXA S SRC35ZXA S SRK35ZXA SB SRC35ZXA S SRK35ZXA SS SRC35ZXA S SRK35ZXA SR SRC35ZXA S ANUAL O g s32 4 ...

Page 2: ...N CONTROL FUNCTION BY REMOTE CONTROL LAP AND LOUVER CONTROL 32 CONOMY OPERATION 32 IGH POWER OPERATION 31 31 UTO RESTART FUNCTION 5NIT BUTTON 31 30 UTLINE OF HEATING OPERATION 33 UTLINE OF AUTOMATIC OPERATION 36 UTLINE OF COOLING OPERATION 35 0ROTECTION CONTROL FUNCTION 37 UTLINE OF DRY DEHUMIDIFYING OPERATION 35 45 44 4ROUBLESHOOTING PROCEDURE F THE AIR CONDITIONER RUNS 4ROUBLESHOOTING PROCEDURE ...

Page 3: ...rved after shortcircuit wire breakage on sensor HECKING THE INDOOR ELECTRICAL EQUIPMENT 60 ع How to read the model name Example SRK 25 Z Series code Inverter type Product capacity Cooling capacity Model name SRK Wall mounted type SRC Outdoor unit XA S SB SS SR 7 Inspection procedures corresponding to detail of trouble 55 ...

Page 4: ...lectric heater Operation control Remote control Wireless remote control Room temperature control Microcomputer thermostat Operation display RUN TIMER HI POWER ECONO CLEAN Temperature White Safety equipments Compressor overheat protection Overcurrent protection Frost protection Serial signal error protection Indoor fan motor error protection Heating overload protection High pressure control Cooling...

Page 5: ...mpressor Electric heater Operation control Remote control Wireless remote control Room temperature control Microcomputer thermostat Operation display RUN TIMER HI POWER ECONO CLEAN Temperature White Safety equipments Compressor overheat protection Overcurrent protection Frost protection Serial signal error protection Indoor fan motor error protection Heating overload protection High pressure contr...

Page 6: ...mpressor Electric heater Operation control Remote control Wireless remote control Room temperature control Microcomputer thermostat Operation display RUN TIMER HI POWER ECONO CLEAN Temperature White Safety equipments Compressor overheat protection Overcurrent protection Frost protection Serial signal error protection Indoor fan motor error protection Heating overload protection High pressure contr...

Page 7: ...pressor Electric heater Operation control Remote control Wireless remote control Room temperature control Microcomputer thermostat Operation display RUN TIMER HI POWER ECONO CLEAN Temperature White Safety equipments Compressor overheat protection Overcurrent protection Frost protection Serial signal error protection Indoor fan motor error protection Heating overload protection High pressure contro...

Page 8: ...Rubber sleeve for fan motor compressor Electric heater Operation control Remote control Wireless remote control Room temperature control Microcomputer thermostat Operation display RUN TIMER HI POWER ECONO CLEAN Temperature White Safety equipments Compressor overheat protection Overcurrent protection Frost protection Serial signal error protection Indoor fan motor error protection Heating overload ...

Page 9: ...e for fan motor Rubber sleeve for fan motor compressor Electric heater Operation control Remote control Wireless remote control Room temperature control Microcomputer thermostat Operation display RUN TIMER HI POWER ECONO CLEAN Temperature White Safety equipments Compressor overheat protection Overcurrent protection Frost protection Serial signal error protection Indoor fan motor error protection H...

Page 10: ...ve for fan motor Rubber sleeve for fan motor compressor Electric heater Operation control Remote control Wireless remote control Room temperature control Microcomputer thermostat Operation display RUN TIMER HI POWER ECONO CLEAN Temperature White Safety equipments Compressor overheat protection Overcurrent protection Frost protection Serial signal error protection Indoor fan motor error protection ...

Page 11: ...e for fan motor Rubber sleeve for fan motor compressor Electric heater Operation control Remote control Wireless remote control Room temperature control Microcomputer thermostat Operation display RUN TIMER HI POWER ECONO CLEAN Temperature White Safety equipments Compressor overheat protection Overcurrent protection Frost protection Serial signal error protection Indoor fan motor error protection H...

Page 12: ...ng Hole on wall for left rear piping Gas piping Outlet for wiring Drain hose Liquid piping F E C D B Symbol A Ǿ65 VP16 Ǿ6 35 1㧛4 Flare Content Ǿ65 Outlet for piping㧔on both side㧕 G Model 25 Ǿ9 52 3㧛8 Flare Model 35 Ǿ12 7 1㧛2 Flare Note㧔1㧕The model name label is attached on the underside of the indoor unit 298 C 100 100 798 525 668 65 65 135 135 8 5 5 285 A B E D ...

Page 13: ...1 It must not be surrounded by walls on the four sides 2 The unit must be fixed with anchor bolts An anchor bolt must not protrude more than 15mm 3 Where the unit is subject to strong winds lay it in such a direction that the blower outlet faces perpendicularly to the dominant wind direction 4 Leave 1m or more space above the unit 5 A wall in front of the blower outlet must not exceed the units he...

Page 14: ... 13 14 SRK T 170 3 Wireless remote control Unit mm ...

Page 15: ... sensor Fan motor Room temp sensor Flap motor Diode stack DS Fuse F Connector CNE FM Louver motor LM Terminal block TB Description Item Varistor VA SM ThI Th2 Yellow YE YE Humidity sensor HD CNF CNG CNM CNU CNY CNR LM SM FM DS Th1 Th2 3 ELECTRICAL WIRING 1 Indoor units Models SRK25ZXA S SB SS SR 35ZXA S SB SS SR ...

Page 16: ...efer to the installation instructions or the construction instructions of the indoor unit ٨ Switchgear of Circuit breaker capacity which is calculated from MAX over current should be chosen along the regulations in each country ٨ The cable specifications are based on the assumption that a metal or plastic conduit is used with no more than three cables contained in a conduit and a voltage drop is 2...

Page 17: ... 50 60 70 Sound Pressure Level dB Standard 2 10 5 Pa N70 N60 N50 N40 N30 N20 Outdoor Unit Model SRC25ZXA S Noise Level Cooling 43 dB A Heating 48 dB A Indoor Unit Model SRK25ZXA S SB SS SR Noise Level Cooling 37 dB A Heating 37 dB A Cooling Heating Cooling Heating Condition ISO T1 JIS C 9612 ٨Mike position 0 8m 1m Unit Mike position Center Low points 4 NOISE LEVEL Model SRK25ZXA S SB SS SR Mike po...

Page 18: ... Indoor Unit Model SRK35ZXA S SB SS SR Noise Level Cooling 43 dB A Heating 43 dB A Cooling Heating Condition ISO T1 JIS C 9612 ٨Mike position 0 8m 1m Unit Mike position Center Low points Model SRK35ZXA S SB SS SR 10 20 30 40 50 60 70 63 125 250 500 1000 2000 4000 8000 Mid Octave Band Frequency Hz 10 20 30 40 50 60 70 Sound Pressure Level dB Standard 2 10 5 Pa N70 N60 N50 N40 N30 N20 Mike position ...

Page 19: ... 18 14 SRK T 170 5 PIPING SYSTEM Models SRK25ZXA S SB SS SR 35ZXA S SB SS SR p G v G m G v G On P j G G j G G n G Y G U Y Z G XYU h G p U h o m G s G UZ v G Os P m j o o l k h G v U y j n k ...

Page 20: ...8 0 9 1 0 1 2 1 1 1 3 0 5 10 15 24 26 20 25 30 35 40 46 15 20 25 30 Outdoor air W B temperature C W B 10 5 0 5 10 15 Cooling operation Outdoor air D B temperature C D B Coefficient of cooling Heating capacity in relation to temperature Heating operation Indoor air D B temperature C D B ISO T1 Standard Condition Depends on installed situation ISO T1 Standard Condition 22 20 18 16 14 Indoor air W B ...

Page 21: ...eat exchanger during heating How to obtain the cooling and heating capacity ѳ Piping length m Cooling Heating 7 1 0 1 0 10 0 99 1 0 15 0 975 1 0 20 0 965 1 0 25 0 95 1 0 30 0 935 1 0 Air inlet temperature of SRK35ZXA S SRK35ZXA S outdoor unit in CWB Adjustment coefficient 15 0 95 0 95 0 94 0 93 0 91 0 88 0 86 0 87 0 92 1 00 10 9 7 5 3 1 1 3 5 or more 3 5 3 4kW ...

Page 22: ...18 4 11 3 15 4 19 3 11 4 35 3 25 4 49 3 17 20 3 57 3 03 3 76 2 99 3 96 3 15 4 05 3 12 4 13 3 09 4 29 3 23 4 43 3 15 Hi 22 3 49 2 99 3 68 2 96 3 89 3 12 3 98 3 09 4 06 3 06 4 23 3 21 4 38 3 13 10 8 24 3 40 2 95 3 59 2 92 3 81 3 09 3 91 3 07 3 99 3 03 4 17 3 19 4 32 3 11 m3 min 26 3 32 2 91 3 51 2 88 3 74 3 06 3 84 3 04 3 92 3 01 4 11 3 17 4 26 3 09 28 3 23 2 87 3 42 2 84 3 66 3 03 3 77 3 01 3 85 2 ...

Page 23: ... further into the box Install the service panel correctly Incorrect installation may result in overheating and fire Be sure to fix up the service panels Incorrect fixing can cause electric shocks or fire due to intrusion of dust or water Be sure to switch off the power supply in the event of installation inspection or servicing If the power supply is not shut off there is a risk of electric shocks...

Page 24: ...plified due to insufficient strength of structure Locations where the infrared receiver is exposed to the direct sunlight or the strong light beam in case of the infrared specification unit Locations where an equipment affected by high harmonics is placed TV set or radio receiver is placed within 1m Locations where drainage cannot run off safely It can affect performance or function and etc Do not...

Page 25: ... air is not trapped Where the installation fittings can be firmly installed Where wind does not hinder the intake and outlet pipes Out of the heat range of other heat sources A place where stringent regulation of electric noises is not applicable Where it is safe for the drain water to be discharged Where noise and hot air will not bother neighboring residents Where snow will not accumulate Where ...

Page 26: ...power supply Turn on power supply again after a while Then press the ON OFF button continuously for at least 5 seconds The operation will start Unit ON OFF button Conventionally operate the wireless remote control by holding in your hand Avoid installing it on a clay wall etc Wireless remote control Battery Cover INSTALLATION OF WIRELESS REMOTE CONTROL Mounting method of battery Fixing to pillar o...

Page 27: ...iping for Liquid 480 Drain hose 520 ø16 Lid Right Air inlet panel The screw of the terminal cover is tightened securely Perform wiring please take care of connecting the terminal number of outdoor unit terminal block Terminal block Clamp Earth wire shall be Yellow Green Y G in color and longer than other AC wires for safety reason Preparation of indoor unit Mounting of connecting wires Remove the ...

Page 28: ...d drain hose making it rotate 3 Insert the drain cap 4 Connect the drain hose Insert the drain cap which was removed at procedure 2 securely using a hexagonal wrench etc Note Be careful that If it is not inserted securely water leakage may occur Insert the drain hose securely making rotate And install the screw Note Be careful that If it is not inserted securely water leakage may occur How to remo...

Page 29: ...water may flow out from vicinity of operation valve or connected pipes Where you are likely to have several days of sub zero temperatures in a row do not use a drain elbow and drain grommets There is a risk of drain water freezing inside and blocking the drain Electric wiring work Perform wiring making wire terminal numbers conform to terminal numbers of indoor unit terminal block Connect using gr...

Page 30: ...er the exterior portion with outer tape and shape the piping to match with the contours of the route that piping will take Also fix the wiring and pipings to the wall with clamps Refrigerant piping Connection wiring Earth wiring Outer tape Clamp Wood screw Drain hose Cover the coupling with insulator and then cover it with tape Vinyl tape Place the slit upward three way valve Charge hose Designed ...

Page 31: ...ach time the button is pressed the mode changes This buttion selects SLEEP operation This buttions is used for setting the current time and timer function FRESH button This buttions selects FRESH operation TIME switch This switch is for setting the time HI POWER light Illuminates during HIGH POWER operation Blinks during heating preparation ECONO light Illuminates during ECONOMY operation TIMER li...

Page 32: ...s the HI POWER ECONO button again to cancel the HIGH POWER operation b HIGH POWER operation is not available during the DRY and the program timer operations c When HIGH POWER operation is set after ON TIMER operation HIGH POWER operation will start from the set time d When the following operation are set HIGH POWER operation will be canceled Ԙ When the HI POWER ECONO button is pressed again ԙ When...

Page 33: ...cessive cooling or heating The unit operate 1 5 higher than the setting temperature during cooling or 2 5 lower than that during heating The remote control displays ECONO mark and the FAN SPEED display disappears a It will go into ECONOMY operation at the next time the air conditioner runs in the following cases Ԙ When the air conditioner is stopped by ON OFF button during ECONOMY operation ԙ When...

Page 34: ... the room temperature setting correction temperature and the suction air temperature is calculated in accordance with the fuzzy rule and used for control of the air capacity and the compressor command speed When the defrosting protection device etc is actuated operation is performed in the corresponding mode ON OFF ON ON ON OFF ON OFF few minutes ON OFF ON ON HOT KEEP OFF OFF OFF 3 minutes ON OFF ...

Page 35: ...utes and 50 seconds 2 3 Max 16 minutes and 50 seconds Heating operation Defrost operation Depends on an operation condition the time can be longer than 7 minutes 2 7 minutes Hot keep operation 20 25 15 10 5 0 Outdoor heat exchanger temperature 20 15 10 5 0 5 10 Outdoor air temperature Defrost operation start Defrost operation start tem perature Accumulated compressor operation time 150 minutes Tem...

Page 36: ...midifying operation a Purpose of DRY mode The purpose is Dehumidi cation and not to control the humidity to the target condition Indoor outdoor unit control the operation condition to reduce the humidity and also prevent over cooling b Outline of control i Indoor unit fan speed and compressor are controlled by the area which is selected by the temp differ ence ii The indoor unit check the current ...

Page 37: ...s been judged following the change of setting temperature with the remote control the hourly judgment of operation mode is cancelled c When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is se lected during heating cooling or dehumidifying operation the unit is operated in the previous operation mode d Setting temperature can be adju...

Page 38: ... swing the louver changes to the vertical po sition iii Resetting condition When any of followings is metdirec 1 Compressor s command speed is less than 32 rps 2 Detected value of humidity is less than 63 Model Item SRK25ZXA S SB SS SR SRK35ZXA S SB SS SR LO Upper limit of compressor s command speed RangeA 50rps RangeB 50rps RangeA 55rps RangeB 55rps Indoor fan 4th speed AUTO HI ME Upper limit of ...

Page 39: ... more Lower limit speed 30 rps 40 rps Model d Cooling high pressure control i Purpose Prevents anomalous high pressure operation during cooling ii Detector Outdoor heat exchanger sensor TH1 iii Detail of operation 53 58 63 Outdoor heat exchanger temperature C 6rps 1 6rps 1 0rps After lapse of 20 sec or over 3 After lapse of 20 sec or over 3 After lapse of 20 sec or over 3 Example Fuzzy Notes 1 Whe...

Page 40: ...rature C 4rps 1 8rps 2 8rps 2 4rps 1 0rps After lapse of 10 sec or over 3 After lapse of 10 sec or over 3 After lapse of 10 sec or over 3 lower limit speed 30 rps Example Fuzzy Temperature list Models SRK25 35 A B C D RPSmin 50 50 RPSmin 90 90 RPSmin 97 97 RPSmin 100 100 RPSmin 115 115 RPSmin First time After the second times Outdoor air temperature C A B C D E F 1 2 10 53 55 53 58 48 46 7 46 7 40...

Page 41: ...perating conditions When the outdoor heat exchanger sensor TH1 is 10ºC or lower continuously for 10 min utes while the compressor command speed is other than 0 rps 2 Detail of operation Upper limit of compressor command speek is 110rps SRK25 only 3 Reset conditions When the either of the following condition is satis ed a When the outdoor heat exchanger sensor TH1 becomes 8ºC or higher b When the c...

Page 42: ...operation current value reaches the limiting current value the compressor command speed is reduced If the mechanism is actuated when the speed of compressor command is less than 30 rps the compressor is stopped immediately Operation starts again after a delay time of 3 minutes k Current cut i Purpose Inverter is protected from overcurrent ii Detail of operation Output current from the converter is...

Page 43: ...p Outdoor fan motor protection q Outdoor fan control at low outdoor temperature Cooling 1 Operating conditions 2 Detail of operation 3 Reset conditions Heating 1 Operating conditions 2 Detail of operation 3 Reset conditions Outdoor temperature 10 C Outdoor temperature 10 C Outdoor fan a b a b a b c i ii min 1 ...

Page 44: ...ture Th2 have met the conditions in the following table for 10 minutes Compressor speed N Operation mode Cooling Heating 1 Indoor air temperature Th1 Th1í4 Th2 Indoor air temperature Th1 Indoor heat exchanger temperature Th2 Th2 Th1 6 50 N 10 Th1 40 0 Th1 40 50 N Except that the fan speed is HI in heating operation ii Contents of control 1 iii Resetting condition When the compressor has been turne...

Page 45: ...bleshooting procedure If the air conditioner does not run at all If the air conditioner does not run at all diagnose the trouble using the following troubleshooting procedure If the air condi tioner is running but breaks down proceed to troubleshooting step 4 Important When all the following conditions are met we say that the air conditioner will not run at all a The RUN light does not light up b ...

Page 46: ...the trouble and perform an operation check The air conditioning system is operating normally Replace the faulty component then perform an operation check Identify the faulty component by using the check procedure corresponding to the content of the trouble Using the Service mode access the self diagnosis displays generated in the past Using the Service mode access the stop history due to protectio...

Page 47: ...or output shortcircuit on power transistor closed service valve 1 time flash ON When there is an emergency stop caused by trouble in the outdoor unit or the input current value is found to be lower than the set value The air conditioner stops When there is an emergency stop caused by trouble in the outdoor unit or the input current value is found to be lower than the set value continuously for 3 m...

Page 48: ... switching are recorded when trouble occurs so more detailed information can be checked These are the data which display the reason by a stop occurred when the air conditioning system performed protective stops etc in the past Even if stop data alone are generated the system restarts automatically After executing the stop mode while the display is normal the system restarts automatically Data for ...

Page 49: ...Displays the remote control information at the time the error code was displayed in the past Displays the outdoor air temperature sensor temperature at the time the error code was displayed in the past Displays the outdoor heat exchanger sensor temperature at the time the error code was displayed in the past Displays the discharge pipe sensor temperature at the time the error code was displayed in...

Page 50: ...the air conditioner was stopped by protective stop control Displays the reason for the stop stop code 5 times previous when the air conditioner was stopped by protective stop control Displays the reason for the stop stop code 6 times previous when the air conditioner was stopped by protective stop control Displays the reason for the stop stop code 7 times previous when the air conditioner was stop...

Page 51: ...sh Outdoor air temperature sensor is abnormal 38 8 time flash Outdoor unit s fan motor is abnormal 48 8 time flash Current safe 58 8 time flash Connection lines between the indoor and outdoor units are faulty 61 1 time flash Serial transmission error 62 2 time flash Discharge pipe sensor is abnormal anomalous stop 39 9 time flash Rotor lock 60 OFF 5 times 3 times 3 times 3 times 2 times Number of ...

Page 52: ...covery occurred for the same reason has reached the number of times in If no is displayed the error display shows that the trouble has occurred once Notes 3 Automatic Recovery Does not occur Automatic recovery occurs d Remote control information tables 1 Operation switching RUN light Operation switching Display pattern when in service mode Operation switching when there is an abnormal stop 0 1 2 3...

Page 53: ...1 62 52 42 32 22 12 2 2 12 22 32 42 52 62 72 82 92 63 53 43 33 23 13 3 3 13 23 33 43 53 63 73 83 93 64 54 44 34 24 14 4 4 14 24 34 44 54 64 74 84 94 55 45 35 25 15 5 5 15 25 35 45 55 65 75 85 95 56 46 36 26 16 6 6 16 26 36 46 56 66 76 86 96 57 47 37 27 17 7 7 17 27 37 47 57 67 77 87 97 58 48 38 28 18 8 8 18 28 38 48 58 68 78 88 98 59 49 39 29 19 9 9 19 29 39 49 59 69 79 89 99 If no data are record...

Page 54: ... 36 56 76 96 116 136 58 38 18 18 38 58 78 98 118 138 If no data are recorded error code is normal the display for sensor becomes as shown below Sensor name Discharge pipe sensor temperature Sensor value displayed when the error code is normal 64ºC Example Discharge pipe temperature 122ºC In the case of discharge pipe data multiply the reading value by 2 Below 61 x 2 122ºC 0 5 sec 0 1 sec 1 5 sec 1...

Page 55: ...ion Indoor heat exchanger sensor temperature on fourth previous occasion Remote control information on fourth previous occasion Outdoor air temperature sensor temperature on fourth previous occasion Outdoor heat exchanger sensor temperature on fourth previous occasion Discharge pipe sensor temperature on fourth previous occasion Error code on fifth previous occasion Room temperature sensor tempera...

Page 56: ... Discharge pipe sensor temperature characteristics Indoor fan motor error Broken sensor wire connector poor connection 0 0 20 40 60 80 100 120 135 20 40 60 80 100 120 140 160 180 Temperature C Resistance k Defective fan motor connector poor connection defective indoor PCB 60 for the fan motor and indoor PCB check pro Power source reset Is it normalized Malfunction by temporary noise Replace fan mo...

Page 57: ... cut Compressor lock Compressor wiring short circuit Compressor output is open phase Outdoor PCB is faulty Service valve is closed EEV is faulty Compressor faulty Current safe stop Overload operation compressor lock overcharge ...

Page 58: ... 57 14 SRK T 170 Over heat of compressor Gas shortage defective discharge pipe sensor Error of signal transmission Wiring error including power cable defective indoor outdoor PCB 55 ...

Page 59: ... outdoor PCB See page 63 for the fan motor and outdoor PCB check pro After making sure the fan motor and outdoor PCB are nor Power source reset Is it normalized Malfunction by temporary noise Replace fan motor If the error persists after replacing the fan motor replace the outdoor PCB the fan motor and outdoor ourdoor PCB outdoor Replace outdoor fan motor AC AC AC AC AC AC resistance and coil wire...

Page 60: ...ling Heating Humidity sensor Cooling Heating Humidity sensor operation Failure mode Control input circuit resding Air conditioning system operation b Outdoor unit Sensor Operation mode Phenomenon Shortcircuit Disconnected wire Heat exchanger sensor Cooling Heating Ourdoor air temperature sensor Cooling Heating Discharge pipe sensor All modes Defrosting is performed for 10 minutes at approx 35 mode...

Page 61: ...locks and oscillating between DC 0 and 20V Inspect power source for outdoor unit Replace fuse Replace indoor PCB Is the fuse burnt out 3 15 A YES YES YES NO NO NO b Indoor unit fan motor check procedure 1 Indoor PCB output check 2 Fan motor resistance check FMI DC15V Indoor PCB DC 308 336V DC several V 4 6 V CNU GND Blue Yellow White Black Red Measuring point Resistance when normal Measuring point...

Page 62: ...rcuit board for the outdoor unit are normal Example RUN light ON TIMER light 2 time flash Measure in this section Operation SW ON 8 10 sec 1 sec 1 sec 3 min 3 min 1 sec 0 Output voltage ACV 10 How to make sure of wireless remote control 1 Is remote control normal YES Again pushing operating switch Operating the unit NO Does unit ON OFF button operates Operating the unit NO NO YES YES Remote contro...

Page 63: ...on of sensor characteristics on page 55 ٟInspection power transistor Remove the fasten terminal and test output voltage ٟInspection of electronic expansion valve See page 63 ٟInspection of outdoor fan motor See page 63 ٟ Check point of outdoor unit CAUTION HIGH VOLTAGE High voltage is produced in the control box Don t touch electrical parts in the control box for 5 minutes after the unit is stoppe...

Page 64: ...t fan motor error is detected diagnose which of the outdoor unit fan motor or outdoor PCB is defective Diagnose this only after con rming that the indoor unit is normal i Outdoor PCB output check 1 Turn off the power 2 Disconnect the outdoor unit fan motor connector CNFAN 3 When the indoor unit is operated by inserting the power supply plug and pressing ON the backup switch for more than 5 seconds...

Page 65: ...itioning Refrigeration Division 16 5 Konan 2 chome Minato ku Tokyo 108 8215 Japan http www mhi co jp Copyright MITSUBISHI HEAVY INDUSTRIES LTD Because of our policy of continuous improvement we reserve the right to make changes in all specifications without notice C ...

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