Mitsubishi Electric MUZ-FS06NA Service Manual Download Page 8 | Manualshive

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WIRING DIAGRAM

MUZ-FS06NA MUZ-FS09NA MUZ-FS12NA

MUZ-FS06NAH MUZ-FS09NAH MUZ-FS12NAH

OBH873

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Summary of Contents for MUZ-FS06NA

Page 1: ...MUZ FS06NAH MUZ FS09NAH MUZ FS12NAH CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 4 4 OUTLINES AND DIMENSIONS 6 5 WIRING DIAGRAM 8 6 REFRIGERANT SYSTEM DIAGRAM 10 7 DATA 12 8 ACTUATOR CONTROL 23 9 SERVICE FUNCTIONS 24 10 TROUBLESHOOTING 25 11 DISASSEMBLY INSTRUCTIONS 46 HFC utilized R410A OUTDOOR UNIT SERVICE MANUAL No OBH873 Indoor unit service manual MSZ FS NA Serie...

Page 2: ... or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure to follow the instructions MUZ FS06NA MUZ FS06NAH MUZ FS09NA MUZ FS09NAH MUZ FS12NA MUZ FS12NAH MUZ FS15NA MUZ FS15NAH MUZ FS18NA MUZ FS18NAH 1 New model OBH873 ...

Page 3: ...FS09NAH MUZ FS12NA MUZ FS12NAH MUZ FS15NA MUZ FS15NAH MUZ FS18NA MUZ FS18NAH PART NAMES AND FUNCTIONS 2 Air outlet Drain outlet Piping Drain hose Air inlet back and side Air outlet Drain outlet Piping Drain hose Air inlet back and side OBH873 ...

Page 4: ...eating 1 4 68 4 54 4 24 4 06 3 46 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 15 20 Min circuit ampacity A 10 18 Fan motor F L A A 0 50 0 93 Compressor Model SNB092FQAMT SNB140FQUMT SNB172FQKMT R L A A 7 4 13 6 L R A A 9 2 17 0 Refrigeration oil fl oz Model 0 35 FV50S 0 35 FV50S 0 40 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 47 48 49 51 52 Heat...

Page 5: ...ed compressor speed 70 60 17 15 H0 Low Heating Steady State at minimum compressor speed 70 60 62 56 5 H1 Low Heating Steady State at minimum compressor speed 70 60 47 43 H2 Int Heating at intermediate compressor speed 5 70 60 35 33 5 At intermediate compressor speed Rated compressor speed minimum compressor speed 3 minimum compressor speed 3 4 2 OPERATION Mode Condition Intake air temperature F In...

Page 6: ...MUZ FS06 09 12NA MUZ FS06 09 12NAH REQUIRED SPACE Liquid refrigerant pipe joint Refrigerant pipe flared Ø 1 4 Gas refrigerant pipe joint Refrigerant pipe flared Ø 3 8 4 in 100 mm or more 14 in 350 mm or more 8 in 200 mm or more 2 4 in 100 mm or more OUTLINES AND DIMENSIONS 4 Unit inch MUZ FS06NA MUZ FS06NAH MUZ FS09NA MUZ FS09NAH MUZ FS12NA MUZ FS12NAH OBH873 ...

Page 7: ...5 32 5 16 6 7 8 19 11 16 33 1 16 3 3 16 HANDLE 3 29 32 6 1 2 4 3 3 5 7 11 16 19 32 GAS REFRIGERANT PIPE JOINT LIQUID REFRIGERANT PIPE JOINT SERVICE PANEL VALVE COVER SERVICE PORT 4 in OR MORE BASICALLY OPEN 20 in OR MORE WITHOUT ANY OBSTRUCTION IN FRONT AND BOTH SIDES OF THE UNIT 14 in OR MORE 20 in OR MORE OPEN TWO SIDES OF RIGHT OR REAR SIDE 4 in OR MORE FLARED ø12 7 1 2 FLARED ø6 35 1 4 REQUIRE...

Page 8: ...8 5 WIRING DIAGRAM MUZ FS06NA MUZ FS09NA MUZ FS12NA MUZ FS06NAH MUZ FS09NAH MUZ FS12NAH OBH873 ...

Page 9: ...9 MUZ FS15NA MUZ FS18NA MUZ FS15NAH MUZ FS18NAH OBH873 ...

Page 10: ... high pressure Service port low pressure Muffler MUZ FS06NA MUZ FS06NAH MUZ FS09NA MUZ FS09NAH MUZ FS12NA MUZ FS12NAH MUZ FS15NA MUZ FS15NAH MUZ FS18NA MUZ FS18NAH Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve Capillary tube O D 0 157 I D 0 094 3 15 16 ø4 0 ø2 4 100 Refrigerant flow in cooling Compress...

Page 11: ...erant charge according to the calculation Model Outdoor unit precharged Refrigerant piping length one way ft 25 30 40 50 60 65 MUZ FS06NA MUZ FS06NAH MUZ FS09NA MUZ FS09NAH MUZ FS12NA MUZ FS12NAH 2 lb 9 oz 0 1 08 3 24 5 40 7 56 8 64 Calculation X oz 1 08 5 oz ft Refrigerant piping length ft 25 NOTE Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculati...

Page 12: ...83 0 96 MUZ FS18NA MUZ FS18NAH 71 21 1 11 3 0 54 1 22 19 7 10 6 0 54 1 34 18 5 9 9 0 54 1 44 67 20 0 13 4 0 67 1 16 18 6 12 4 0 67 1 27 17 2 11 5 0 67 1 38 63 18 7 15 1 0 80 1 10 17 4 14 0 0 80 1 22 16 2 13 0 0 80 1 31 Model Indoor air Outdoor intake air DB temperature F IWB F 105 115 TC SHC SHF TPC TC SHC SHF TPC MUZ FS06NA MUZ FS06NAH 71 6 0 5 0 0 83 0 35 5 5 4 6 0 83 0 36 67 5 6 5 4 0 96 0 33 5...

Page 13: ...NA MUZ FS12NAH 1 0 0 988 0 967 MUZ FS15NA MUZ FS15NAH MUZ FS18NA MUZ FS18NAH 1 0 0 985 0 963 0 933 3 HEATING CAPACITY CORRECTIONS Refrigerant piping length one way ft 25 std 40 65 100 MUZ FS06NA MUZ FS06NAH MUZ FS09NA MUZ FS09NAH MUZ FS12NA MUZ FS12NAH 1 0 0 997 0 993 MUZ FS15NA MUZ FS15NAH MUZ FS18NA MUZ FS18NAH 1 0 0 997 0 993 0 987 OBH873 ...

Page 14: ...2 0 46 7 7 0 59 9 7 0 70 11 3 0 79 12 7 0 83 13 0 0 84 14 6 0 88 MUZ FS12NAH 75 5 4 0 63 7 1 0 76 8 9 0 87 10 6 0 83 12 0 0 87 12 4 0 88 14 0 0 92 70 5 8 0 61 7 6 0 74 9 2 0 86 10 9 0 81 12 3 0 85 12 7 0 87 14 3 0 90 65 6 2 0 59 7 7 0 72 9 7 0 83 11 3 0 79 12 7 0 83 13 0 0 84 14 6 0 88 MUZ FS15NA 75 7 0 0 68 9 3 0 86 11 6 1 01 13 8 1 13 15 6 1 18 16 1 1 20 18 2 1 25 70 7 6 0 65 9 8 0 83 12 0 0 99 ...

Page 15: ...or air Wet bulb temperature difference F 71 67 63 65 75 85 95 105 115 0 7 0 8 0 9 1 0 1 1 1 2 Indoor intake air WB temperature F SHF at rating condition 0 7 437 CFM Airflow Outdoor intake air DB temperature F Total power consumption kW MUZ FS18NA MUZ FS18NAH 71 67 63 65 75 85 95 105 115 0 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 Indoor intake air WB temperature F SHF at rating condition 0 67 437 CFM Airflow ...

Page 16: ...emperature F 65 70 75 5 5 15 25 35 45 55 65 0 2 0 4 0 6 0 8 1 0 1 2 1 4 Indoor intake air DB temperature F 514 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW MUZ FS09NA MUZ FS12NA 65 70 75 5 5 15 25 35 45 55 65 0 3 0 4 0 5 0 6 0 7 0 8 Indoor intake air DB temperature F 437 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW 65 70 75 5 5 15 25 35 4...

Page 17: ...00 450 500 F F 65 70 75 80 85 90 95 100 105 110 115 80 100 120 140 160 180 200 PSIG Condensing pressure Suction pressure Outdoor ambient temperature Indoor DB temperature F PSIG Indoor DB temperature F Outdoor ambient temperature 86 80 75 70 86 80 75 70 65 70 75 80 85 90 95 100 105 110 115 200 250 300 350 400 450 500 F F 65 70 75 80 85 90 95 100 105 110 115 100 120 140 160 180 200 220 240 PSIG Con...

Page 18: ...ure 86 80 75 70 86 80 75 70 MUZ FS15NA MUZ FS15NAH 75 70 65 75 70 65 PSIG Condensing pressure Outdoor ambient temperature F F PSIG Suction pressure Outdoor ambient temperature 5 15 25 35 45 55 65 75 200 250 300 350 400 Indoor DB temperature F 5 15 25 35 45 55 65 75 50 70 90 110 130 150 170 190 210 Indoor DB tem perature F Heating Data are based on the condition of outdoor humidity 75 Air flow shou...

Page 19: ... Indoor DB temperature F 5 15 25 35 45 55 65 75 50 75 100 125 150 175 200 Indoor DB tem perature F MUZ FS18NA MUZ FS18NAH 75 70 65 75 70 65 PSIG Condensing pressure Outdoor ambient temperature F F PSIG Suction pressure Outdoor ambient temperature 5 15 25 35 45 55 65 75 300 350 400 450 500 550 600 Indoor DB temperature F 5 15 25 35 45 55 65 75 50 75 100 125 150 175 200 Indoor DB tem perature F OBH8...

Page 20: ...2 43 2 18 2 55 2 31 3 75 3 39 3 63 3 28 3 86 3 49 4 32 3 91 5 63 5 09 6 54 5 91 Fan motor current A 0 36 0 33 0 39 0 35 0 36 0 33 0 39 0 35 0 41 0 37 0 40 0 36 0 85 0 77 0 95 0 86 0 85 0 77 0 95 0 86 Refrigerant circuit Condensing pressure PSIG 336 295 360 295 377 333 345 363 361 410 Suction pressure PSIG 175 110 152 110 137 104 139 109 123 107 Discharge temperature F 133 139 146 139 163 150 143 1...

Page 21: ...perational frequency of compressor Correction of Cooling total input The operational frequency of compressor Correction of Heating total input The operational frequency of compressor Correction of Heating capacity The operational frequency of compressor Hz Hz Hz Hz MUZ FS15NA MUZ FS15NAH Capacity correction factors Input correction factors Input correction factors Capacity correction factors Corre...

Page 22: ...un operation EMERGENCY OPERATION press EMERGENCY OPERATION switch or any button on remote controller MUZ FS18NA MUZ FS18NAH Capacity correction factors Input correction factors Input correction factors Capacity correction factors Correction of Cooling capacity The operational frequency of compressor Correction of Cooling total input The operational frequency of compressor Correction of Heating tot...

Page 23: ...ssor LEV Outdoor fan motor R V coil Indoor fan motor Defrost heater Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protec tion Defrost thermistor Heating Defrosting Fin temperature thermistor Protection Ambient temperature thermistor Cooling Low ambient tempera ture operation Heating Defrosting Heater Outdoor heat ...

Page 24: ...perature 32 F 0 C or less may cause the following troubles To prevent those troubles activate the pre heat control 1 If moisture gets into the refrigerant cycle and freezes it may interfer the start up of the compressor 2 If liquid refrigerant collects in the compressor a failure in the compressor may occur The pre heat control turns ON when the compressor temperature is 68 F 20 C or below When th...

Page 25: ...ng the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 5 When connecting or disconnecting the connectors hold the connector housing DO NOT pull the lead wires 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is blinking on and off to indicate an abnormality To make sure check how many times the OPERATION ...

Page 26: ...rmality Before blinking does the left lamp of the OPERATION INDI CATOR lamp stay ON for 3 seconds When it stays ON for 3 seconds without beep The outdoor unit is abnormal The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the indoor unit failure mode table Refer to indoor unit service manual Make sure to check at least 2 consecutive blinking cycl...

Page 27: ... blinking pattern and identify the abnormal point by referring to the outdoor unit failure mode table 10 2 3 Make sure to check at least 2 consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Repair the failure parts The...

Page 28: ...s abnormality Compressor start up failure protection 12 time blink 2 5 seconds OFF Waveform of compressor current is distorted Reconnect compressor connector Refer to 10 5 How to check inverter compressor 5 time blink 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor ...

Page 29: ...ndoor thermistor is detected Check the 4 way valve Replace the inverter P C board Refer to TEST POINT DIAGRAM AND VOLTAGE on the service manual of indoor and outdoor unit for the characteristics of the thermistors Do not start the operation again without repair to prevent hazards 16 time blink 2 5 seconds OFF 1 Outdoor refrigerant system abnormality 1 time blink 2 5 seconds OFF A closed valve and ...

Page 30: ... tem perature overheat protection Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later Check refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV 10 4 time blink 2 5 seconds OFF Fin temperature P C board tem perature thermistor overheat protection T...

Page 31: ...r thermistors 20 Outdoor unit operates 7 time blink 2 5 seconds OFF Low discharge tem perature protection Temperature of discharge temperature thermistor has been 122 F 50 C or less for 20 minutes Refer to 10 5 Check of LEV Check refrigerant circuit and refrig erant amount 21 8 time blink 2 5 seconds OFF MUZ FS06 09 12 PAM protection PAM Pulse Ampli tude Modulation The overcurrent flows into PFC P...

Page 32: ... P C board for the chart of thermistor Compressor Measure the resistance between terminals using a tester Temperature 14 104 F 10 40 C Normal Ω MUZ FS06 09 MUZ FS12 MUZ FS15 18 U V U W V W 1 60 2 17 1 66 2 26 0 87 1 18 Outdoor fan motor Measure the resistance between lead wires using a tester Temperature 14 104 F 10 40 C Color of lead wire Normal Ω MUZ FS06 09 12 MUZ FS15 18 RED BLK BLK WHT WHT RE...

Page 33: ...heck of open phase C Check of compressor With the connector between the compressor and the power module IC700 disconnected activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals Output voltage is 50 130 V The voltage may differ according to the tester Operation method Start cooling or heating operation by pressing EMERGENCY OPERATION switch...

Page 34: ...0 minutes Do not recover refrigerant gas while heating Heating part Connect the compressor and activate the inverter Then measure the time until the inverter stops due to overcurrent Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERATION Refer to 7 6 Measurement Measure the time from the start of compressor to the stop of co...

Page 35: ...of thermistor normal Refer to 10 6 1 Reconnect the connector of thermistor Turn ON the power supply and press EMERGENCY OPERATION switch Does the unit operate for 10 minutes or more without showing thermistor abnormality OK Cause is poor contact Yes Yes Disconnect the connector of thermistor in the inverter P C board see below table and measure the resistance of thermistor MUZ FS15 18 Thermistor S...

Page 36: ...power module IC700 Turn ON the power supply and press EMERGENCY OPERATION switch once COOL mode First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 In case CN602 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V coil Check if CN602 is connected Is there 208 2...

Page 37: ...measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Does the voltage between each terminal become 5 and 0 VDC repeatedly Does the outdoor fan motor rotate smoothly Replace the outdoor fan motor Replace the inverter P C board Yes Yes No Fixed to either 5 or 0 VDC No No Yes Disconnect the connectors CN931 and CN932 from the inverter P C board Check the connection between the...

Page 38: ...ht up or blink Refer to 10 6 1 No Replace the inverter P C board Is there bus bar voltage 260 370 VDC between DB61 and DB61 MUZ FS06 09 12 294 370 VDC between IC700 P and N MUZ FS15 18 on the inverter P C board Refer to 10 6 1 No Check the electric parts in main circuit Yes Yes No Disconnect the connector between the compressor and the power module IC700 Turn ON power supply and press EMERGENCY OP...

Page 39: ...voltage by an analog tester Properly fix the LEV coil to the expansion valve Replace the inverter P C board Replace the LEV coil Replace the expansion valve Is LEV coil properly fixed to the expansion valve Does the resistance of LEV coil have the characteristics Refer to 10 4 Do you hear the expansion valve click click Do you feel the expansion valve vibrate when touching it Turn ON the power sup...

Page 40: ...door fan motor If the connection is poor make it correct Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in verter P C board Does the LED blink 10 times Replace the inverter P C board Check the corresponding parts following LED indication Refer to 10 3 Yes No Yes 10 time blink No L Check of inverter P C board OBH873 ...

Page 41: ...6 second OFF and 0 8 second ON quick blinking 3 Yes No Lighted or not lighted Replace the inverter P C board 2 2 Be careful of the residual voltage of smoothing capacitor Is there amplitude of 10 to 20 VDC between the indoor terminal block S2 and S3 Confirmation of serial signal Yes Check the wiring If there are any error of the indoor outdoor connecting wire such as the damage of the wire interme...

Page 42: ...d let the defrost thermistor continue to read 30 F 1 C or below NOTE In case both thermistors are more than the above temperature cool them with cold water etc MUZ FS06NAH MUZ FS09NAH MUZ FS12NAH MUZ FS15NAH MUZ FS18NAH O Check of outdoor refrigerant circuit Has the operation stopped during pump down Was the operation started with the stop valve closed and was it opened during operation No Yes The...

Page 43: ...ondition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outdoor unit of the a...

Page 44: ...400 500 600 700 800 32 50 68 86 104 122 140 158 176 194 212 230 248 Fuse F701 T3 15AL250V 208 230 V AC Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 DB61 260 370 V DC Front side of unit 208 230 V AC Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Smoothing capacitor C61 Fuse F...

Page 45: ...emperature thermistor RT62 CN671 Output to drive outdoor fan motor CN932 Outdoor heat exchanger temperature thermistor RT68 CN671 Fuse F901 T3 15AL250V Fuse F880 T3 15AL250V Expansion valve coil LEV CN724 Signal of outdoor fan motor CN931 208 230 V AC 294 370 V DC IC700 P IC700 N LED Back side of unit Front side of unit Fuse F61 25 A 250V Output to drive compressor LDU LDV LDW Fuse F62 15 A 250 V ...

Page 46: ...s figures Indicates the invisible parts in the photos figures 46 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Terminal with locking mechanism Detaching points The terminal w...

Page 47: ... of the terminal block support and the back panel 6 Remove the inverter assembly 7 Remove the screw of the ground wire and screw of the ter minal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and remove the inverter P C board from the P C board support Photo 6 3 Removing R V coil 1 Remove the cabinet and panels Refer to section...

Page 48: ...emperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor 3 Pull out the discharge temperature thermistor from its holder 4 Pull out the defrost thermistor from its holder Photo 9 5 Pull out the outdoor heat exchanger temperature thermistor from its holder Photo 9 6 Pull out the ambient temperature thermistor from its holder Photo 8 Photo 9 Pho...

Page 49: ...ly Refer to section 2 3 Remove the screws fixing the reactor 4 Remove the reactor 5 Remove the soundproof felt 6 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 7 Detach the brazed part of the suction and the discharge pipe connected with compressor 8 Remove the nuts fixing the compressor 9 Remove the compressor 10 Detach the brazed pa...

Page 50: ...the top panel 6 Remove the valve cover 7 Disconnect the power supply and indoor outdoor connect ing wire 8 Remove the screws of the cabinet 9 Remove the cabinet 10 Remove the screws of the back panel 11 Remove the back panel Photo 2 Photo 1 50 Screws of the cabinet Screws of the top panel Screws of the cabinet Screws of the top panel Screws of the service panel Screw of the valve cover Screws of t...

Page 51: ...or support 6 Remove the fixing screws of the terminal block support and the back panel 7 Remove the inverter assembly 8 Remove the screws of the ground wires 9 Remove the screw of the heat sink support and the heat sink support from the P C board support 10 Remove the screws of the terminal block support and the screws of the ground wires Photo 7 11 Remove the terminal block support Photo 5 Photo ...

Page 52: ...sion valve coil to the connector on the inverter P C board Pull the lead wires of the expansion valve coil toward you and put them on the left hook on the P C board support as shown in Photo 9 Photo 7 Photo 8 Photo 9 52 Screws of the terminal block support Screws of the ground wires and the terminal block support Lead wires of the expansion valve coil Hook of the lead wires of the reactor Hook of ...

Page 53: ...mistor from its hold er Photo 12 4 Pull out the defrost thermistor from its holder 5 Pull out the outdoor heat exchanger temperature thermistor from its holder Photo 10 6 Pull out the ambient temperature thermistor from its holder Photo 10 4 Removing outdoor fan motor 1 Remove the top panel cabinet and service panel Refer to section 1 2 Disconnect the following connectors Inverter P C board CN931 ...

Page 54: ...h the brazed part of the suction and the discharge pipe connected with compressor 6 Remove the compressor nuts 7 Remove the compressor 8 Detach the brazed parts of 4 way valve and pipe Photo 13 Photo 12 Photo 13 54 Copyright 2020 MITSUBISHI ELECTRIC CORPORATION Published Nov 2020 No OBH873 Made in Japan HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Specifications are ...

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