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Mitsubishi Electric MUZ-FH09NA, Руководство по обслуживанию

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21

8

ACTUATOR CONTROL

MUZ-FH09NA  MUZ-FH09NAH  MUZ-FH12NA  MUZ-FH12NAH  MUZ-FH15NA  MUZ-FH15NAH

8-2. R.V. COIL CONTROL

Heating . . . . . . . . . . . . . . . . .  ON
 Cooling . . . . . . . . . . . . . . . . .  OFF
Dry  . . . . . . . . . . . . . . . . . . . .  OFF

NOTE

: The 4-way valve reverses for 5 seconds right before start-up of the compressor.

ON

OFF

ON

OFF

Outdoor fan

motor

Compressor

5 seconds

15 seconds

8-1. OUTDOOR FAN MOTOR CONTROL

The fan motor turns ON/OFF, interlocking with the compressor.
[ON]  The fan motor turns ON 5 seconds before the compressor starts up.
[OFF]  The fan motor turns OFF 15 seconds after the compressor has stopped running.

8-3. RELATION BETWEEN MAIN SENSOR AND ACTUATOR

Sensor

Purpose

Actuator

Compressor

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 exchanger tem-
perature thermistor

Cooling: Low ambient tempera-
ture operation

○

○

○

Cooling: High pressure protec-
tion

○

○

○

*. 

MUZ-FH•NAH

 only.

ON

OFF

Compressor

Outdoor fan

motor

R.V.coil

ON

OFF

ON

OFF

<COOL>

5 seconds

<HEAT>

5 seconds

OBH584A

Содержание MUZ-FH09NA

Страница 1: ...Y INSTRUCTIONS 44 Models MUZ FH09NA MUZ FH12NA MUZ FH15NA SPLIT TYPE AIR CONDITIONERS OUTDOOR UNIT Indoor unit service manual MSZ FH NA Series OBH683 NOTE RoHS compliant products have G mark on the spec name plate HFC utilized R410A No OBH684 REVISED EDITION A PARTS CATALOG OBB684 MUZ FH09NAH MUZ FH12NAH MUZ FH15NAH MUZ FH09NA MUZ FH12NA MUZ FH09NAH MUZ FH12NAH Please void OBH684 Revision A 3 SPEC...

Страница 2: ...or fire when the unit is being used serviced 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 Revision A 3 SPECIFICATION has been modified The values of COP have been modified 10 TROUBLESHO...

Страница 3: ...H12NA MUZ FH09NAH MUZ FH12NAH MUZ FH15NA MUZ FH15NAH Piping Air outlet Drain outlet Air inlet back and side Drain hose PART NAMES AND FUNCTIONS 2 Air outlet Drain outlet Piping Drain hose Air inlet back and side OBH584A ...

Страница 4: ...acity A 11 16 Fan motor F L A 0 50 0 93 Compressor Model SNB092FQAMT SNB140FQUMT SNB172FQKMT R L A 8 2 12 0 L R A 10 3 15 0 Refrigeration oil L Model 0 35 FV50S 0 35 FV50S 0 40 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 48 49 51 Heating dB A 49 51 55 Defrost method Reverse cycle Dimensions W in 31 1 2 33 1 16 D in 11 1 4 13 H in 21 5 8 34 5 8 Weight Ib 81 83 124 Ex...

Страница 5: ...Speed 70 60 17 15 H0 1 Heating Steady State at minimum compressor Speed 70 60 62 56 5 H1 1 Heating Steady State at minimum compressor Speed 70 60 47 43 H2 V Heating at Intermediate compressor Speed 5 70 60 35 33 5 At Intermediate compressor Speed Cooling rated compressor speed minimum compressor speed 3 minimum compressor speed 3 4 2 OPERATION Mode Condition Intake air temperature F Indoor Outdoor...

Страница 6: ...unit are clear holes 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 FH09NA MUZ FH09NAH MUZ FH12NA MUZ FH12NAH OBH584A ...

Страница 7: ...9 32 6 1 2 7 11 16 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pipe flared Ø 1 4 Gas refrigerant pipe joint Refrigerant pipe flared Ø 1 2 1 20 in 500 mm or more when front and sides of the unit are clear 14in 350 mm or more 4 in 100 mm or more REQUIRED SPACE Clear 1 4 in 100 mm or more 20 in 500 mm or more 2 2 When any 2 sides of left right and rear of the unit are clear OBH584A ...

Страница 8: ...8 5 WIRING DIAGRAM MUZ FH09NA MUZ FH12NA MUZ FH09NAH MUZ FH12NAH OBH584A ...

Страница 9: ...9 MUZ FH15NA OBH584A ...

Страница 10: ...10 MUZ FH15NAH OBH584A ...

Страница 11: ... ø4 0 ø2 4 240 Outdoor heat exchanger temperature thermistor RT68 Capillary tube O D 0 118 I D 0 079 8 9 32 ø3 0 ø2 0 210 Service port Service port Muffler MUZ FH15NA MUZ FH15NAH 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 c...

Страница 12: ...H 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 calculation Model Outdoor unit precharged Refrigerant piping length one way ft 25 30 40 50 60 65 MUZ FH12NA MUZ FH12NAH 2 lb 9 oz 0 1 62 4 86 8 10 11 34 12 96 Calculation X oz 1 62 5 oz ft Refrigerant pi...

Страница 13: ... 6 0 73 13 0 10 8 0 80 12 0 10 0 0 87 11 2 9 3 0 92 10 3 8 5 0 97 63 13 1 12 6 0 70 12 1 11 7 0 77 11 3 10 9 0 83 10 3 9 9 0 89 9 4 9 0 0 92 MUZ FH15NA MUZ FH15NAH 71 18 4 10 4 1 07 17 2 9 7 1 17 16 1 9 1 1 26 15 0 8 5 1 33 13 8 7 8 1 38 67 17 4 12 2 1 01 16 2 11 3 1 11 15 0 10 5 1 20 14 0 9 8 1 27 12 8 9 0 1 33 63 16 4 13 6 0 96 15 2 12 6 1 06 14 1 11 8 1 15 12 8 10 7 1 22 11 7 9 8 1 27 NOTE 1 IW...

Страница 14: ... 10 7 0 91 12 4 0 88 14 0 0 93 14 4 0 94 16 2 0 99 MUZ FH15NA 75 7 9 0 77 10 4 0 97 13 1 1 14 15 6 1 27 17 6 1 33 18 1 1 35 20 5 1 40 70 8 6 0 73 11 1 0 94 13 5 1 11 15 9 1 24 18 0 1 30 18 5 1 33 21 0 1 38 65 9 0 0 70 11 3 0 90 14 1 1 07 16 5 1 20 18 5 1 27 19 1 1 29 21 4 1 35 MUZ FH15NAH 75 7 9 0 90 10 4 1 10 13 1 1 27 15 6 1 27 17 6 1 33 18 1 1 35 20 5 1 40 70 8 6 0 86 11 1 1 07 13 5 1 24 15 9 1...

Страница 15: ...erature F SHF at rating condition 0 83 398 CFM Airflow Outdoor intake air DB temperature F Total power consumption kW MUZ FH09NA MUZ FH09NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH Cooling capacity at Rated frequency 0 9 1 0 1 1 1 2 1 3 1 4 1 5 14 23 32 41 50 59 68 77 86 95 104 113 Outdoor intake air DB temperature F Capacity correction factors 76 75 68 64 72 Indoor intake air Wet bulb tempe...

Страница 16: ... at Rated frequency Capacity correction factor 59 68 79 Indoor intake air Dry bulb temperature F 65 70 75 5 5 15 25 35 45 55 65 0 50 0 75 1 00 1 25 1 50 Indoor intake air DB temperature F 454 CFM Airflow Outdoor intake air WB temperature F Total power consumption kW MUZ FH09NA MUZ FH12NA 65 70 75 5 5 15 25 35 45 55 65 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 Indoor intake air DB temperature F 437 CFM Airfl...

Страница 17: ...70 MUZ FH09NA MUZ FH09NAH 65 70 75 80 85 90 95 100 105 200 250 300 350 400 450 500 F F 60 65 70 75 80 85 90 95 100 105 90 110 130 150 170 190 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 MUZ FH15NA MUZ FH15NAH 65 70 75 80 85 90 95 100 105 200 250 300 350 400 450 500 F F...

Страница 18: ...t 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 75 250 290 330 370 410 450 49Hz Indoor DB temperature F 5 15 25 35 45 55 65 75 50 75 100 125 150 175 200 Indoor DB tem perature F 49Hz MUZ FH15NA MUZ FH15NAH 75 70 65 75 70 65 PSIG Condensing pressure Outdoor ambient temperature F F PSIG Suction pressur...

Страница 19: ... 46 4 03 4 87 4 40 Fan motor current A 0 36 0 33 0 34 0 31 0 41 0 37 0 40 0 36 1 21 1 09 1 24 1 12 Refrigerant circuit Condensing pressure PSIG 352 323 374 340 361 391 Suction pressure PSIG 153 110 135 106 131 108 Discharge temperature F 148 145 156 148 152 170 Condensing temperature F 107 101 112 105 109 115 Suction temperature F 64 41 56 36 52 45 Comp shell bottom temperature F 129 125 137 128 1...

Страница 20: ...he operational 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 0 25 50 75 100 0 0 0 5 1 0 1 5 2 0 0 25 50 75 100 0 0 0 5 1 0 1 5 2 0 0 25 50 75 100 0 0 0 5 1 0 1 5 2 0 0 25 50 75 100 0 0 0 5 1 ...

Страница 21: ...stopped running 8 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Purpose Actuator Compressor 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 t...

Страница 22: ... the pre heat control turns ON the compressor is energized About 50 W MUZ FH15 Prolonged low load operation in which the thermostat is OFF for a long time at low outside temperature 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 li...

Страница 23: ...tor 4 When removing 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 housing of the connector DO NOT pull the lead wires 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality To make sure check how m...

Страница 24: ...abnormality Before blinking does the left lamp of the OPERATION INDI CATOR lamp stay ON for 3 seconds 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 two consecutive blinking cycles...

Страница 25: ...linking pattern and identify the abnormal point by referring to the outdoor unit failure mode table 10 2 3 Make sure to check at least two 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...

Страница 26: ...ity Compressor start up failure protection 12 time flash 2 5 seconds OFF Waveform of compressor current is distorted Reconnect compressor connector Refer to 10 5 How to check inverter compressor 5 time flash 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 reads 212 ...

Страница 27: ...Each phase current of compressor cannot be detected normally 14 time flash or more 2 5 seconds OFF Stop valve Closed valve 14 time flash 2 5 seconds OFF Closed valve is detected by compressor current Check stop valve 4 way valve Pipe temperature 16 time flash 2 5 seconds OFF The 4 way valve does not work properly The indoor coil thermistor detects an abnormal temperature Check the 4 way valve Repl...

Страница 28: ...T module IC700 FH15 Reconnect connector of compressor Refer to 10 5 How to check inverter compressor Check stop valve 10 3 time flash 2 5 seconds OFF Discharge 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 cir...

Страница 29: ...rmistors 21 Outdoor unit operates 7 time flash 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 22 8 time flash 2 5 seconds OFF MUZ FH09 12 PAM protection PAM Pulse Ampli tude Modulation The overcurrent flows into PFC Power fac...

Страница 30: ...chart of thermistor Compressor Measure the resistance between terminals using a tester Temperature 14 104 F 10 40 C Normal Ω MUZ FH09 MUZ FH12 MUZ FH15 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 FH09 12 MUZ FH15 RED BLK BLK WHT WHT RED 29 40 12 16 R V coil 21S4 Mea...

Страница 31: ...eck of open phase C Check of compressor With the connector between the compressor and the power module IC700 MUZ FH09 12 IGBT module IC700 MUZ FH15 disconnected activate the inverter and check if the inverter is normal by measuring the voltage balance between the termi nals Output voltage is 50 130 V The voltage may differ according to the tester Operation method Start cooling or heating operation...

Страница 32: ...h a drier for about 20 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 over current 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 compre...

Страница 33: ...f 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 FH15 Thermistor Symbo...

Страница 34: ...he 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 20...

Страница 35: ...easure 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 ...

Страница 36: ...rd light up or flash Refer to 10 6 1 No Replace the inverter P C board Is there DC voltage 260 370 VDC between DB61 and DB61 MUZ FH09 12 294 370 VDC between JP715 and JP30 MUZ FH15 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 MUZ FH09 12 IGBT module IC700 MUZ FH15 Turn ON ...

Страница 37: ...e 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 on touching it Turn ON the power sup...

Страница 38: ...oor 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 flash 10 times Replace the inverter P C board Check the corresponding parts following LED indication Refer to 10 3 Yes No Yes 10 time flash No L Check of inverter P C board OBH584A ...

Страница 39: ...er P C board repeat 3 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 dama...

Страница 40: ...below and 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 FH09NAH MUZ FH12NAH MUZ FH15NAH Has the operation stopped during pump down Was the operation started with the stop valve closed and was it opened during operation No Yes O Check of outdoor refrigerant circuit The operation has s...

Страница 41: ...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...

Страница 42: ...r CN931 208 230 VAC Outdoor heat exchanger temperature thermistor RT68 CN644 Jumper wire for pre heat control setting JK Heater connector CN722 MUZ FH09 12NAH Fuse F801 T3 15AL250V Back side of unit LEV connector CN724 Output to drive outdoor fan motor CN932 LED 4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature F Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor h...

Страница 43: ... Fuse F601 T3 15AL250V Signal of out door fan motor CN931 R V coil CN602 208 230 VAC 294 370 VDC JP715 JP30 LED Heater connector CN601 208 230 VAC MUZ FH15NAH 4 14 32 50 68 86 104 0 10 20 30 40 50 60 70 80 90 100 Temperature F Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Temperature F Discharge temperature thermistor RT62 32 50 68 8...

Страница 44: ...de 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 which has the locking mechanism can be detached as shown below There ar...

Страница 45: ...e 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 1 2 Disconnec...

Страница 46: ...re 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 6 5 Pull out the outdoor heat exchanger temperature thermistor from its holder Photo 6 6 Pull out the ambient temperature thermistor from its holder Photo 8 Photo 9 Photo 10 46...

Страница 47: ...to 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 part of pipes conne...

Страница 48: ...ve the conduit plate 9 Remove the top panel 10 Remove the valve cover 11 Disconnect the power supply and indoor outdoor connect ing wire 12 Remove the screws of the cabinet 13 Remove the cabinet 14 Remove the screws of the back panel 15 Remove the back panel Photo 2 Photo 1 Photo 3 Photo 4 48 Screws of the cabinet Screws of the top panel Screws of the cabinet Screws of the top panel Screw of the b...

Страница 49: ...MUZ FH15NAH 3 Remove the compressor connector 4 Remove the screws fixing the relay panel 5 Remove the relay panel 6 Remove the ground wires and the lead wires of the inverter P C board 7 Remove the screws of the P B support 8 Remove the inverter P C board from the P B support Photo 5 Photo 6 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connector Inverte...

Страница 50: ...binet and service panel Refer to 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller 4 Remove the screws fixing the fan motor 5 Remove the fan motor 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Remove the sou...

Страница 51: ...51 OBH584A ...

Страница 52: ...ributed in Apr 2014 No OBH684 REVISED EDITION A Distributed in Feb 2014 No OBH684 Made in Japan HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN New publication effective Apr 2014 Specifications are subject to change without notice ...

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