Mitsubishi Electric MXZ-2HJ40VA Service Manual Download Page 47

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2. Outdoor control P.C. board

LED 1

LED 2

CN801

Bus-bar

voltage

325 - 370
VDC Input

(

LEV Room

(

12 VDC

pulse wave

(

LEV Room

(

12 VDC

pulse wave

(

LEV Room

(

12 VDC

pulse wave

(

High pressure switch

Defrost thermistor (R

T61)

Discharge temperature thermistor (R

T62)

Outdoor heat exchanger temperature thermistor (R

T68)

(

(+)

(–)

(+)

(–)

(

CN661

Signal transmission (T

o power P

.C. board)

5 VDC pulse wave

LEV E

(

(+)

(–)

(

(+)

(–)

(

(+)

(–)

(

CN791

CN792

CN793

CN681

(

F801

FUSE

T3.15AL250V

(

Ambient temperature thermistor (R

T65)

CN665

Serial signal Room C
12 - 24 VDC

Serial signal Room B
12 - 24 VDC

Serial signal Room A
12 - 24 VDC

CN621

CN611

CN601

Input

SW2

CN795 12 VDC pulse wave

Temperature (°C)

Discharge temperature thermistor (RT62)

5HVLVWDQFHN

100

200

300

400

500

600

700

800

10 20 30 40 50 60 70 80 90 100 110 120

-20

-10

100

Defrost thermistor (RT61)
Ambient temperature thermistor (RT65)
Outdoor heat exchanger temperature thermistor (RT68)

Temperature (°C)

Resistance (k

)

MXZ-3HJ50VA

CN701

15V

(+)

(–)

(

Signal reception (From power P

.C. board)

5 VDC pulse wave

CN702

F930

FUSE

T3.15AL250V

CN931

To Fan motor

CN931

Bus-bar voltage

325 - 370 VDC

Input

15 VDC

Rotate instruction

Rotate signal

230 VAC

CN711
230 VAC

F711 FUSE

T3.15AL250V

CN712

R.V .coil

SW871

LED 3

(–)

OBH709A

Summary of Contents for MXZ-2HJ40VA

Page 1: ...SIONS 7 6 WIRING DIAGRAM 9 7 REFRIGERANT SYSTEM DIAGRAM 10 8 PERFORMANCE CURVES 13 9 ACTUATOR CONTROL 19 10 SERVICE FUNCTIONS 20 11 TROUBLESHOOTING 24 12 DISASSEMBLY INSTRUCTIONS 50 INDOOR UNITS COMBINATION SHEETS NOTE RoHS compliant products have G mark on the spec name plate PARTS CATALOG OBB709 MXZ 2HJ40VA Indoor unit service manual MSZ HJ VA Series OBH647C Please void OBH709 Revision A Additio...

Page 2: ...e inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live parts Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion 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 ou...

Page 3: ...IONS 2 ACCESSORIES MXZ 2HJ40VA Air inlet Air outlet Drain outlet Piping Drain hose Back and side Model MXZ 2HJ40VA MXZ 3HJ50VA Drain socket 1 1 Drain cap 2 Air outlet Drain outlet Air inlet Back and side MXZ 3HJ50VA OBH709A ...

Page 4: ...C O P Total 1 2 3 81 3 71 Compressor Model KNB092FFDHC Output W 1 100 Current 1 2 A 4 7 5 2 Refrigeration oil Model L 0 32 NEO22 Fan motor Model RC0J50 FA Current 1 2 A 0 19 0 23 Dimensions W x H x D mm 800 x 550 x 285 Weight kg 32 Special remarks Air flow Rated m3 h 1 752 1 914 Sound level Rated dB A 48 52 Fan speed Rated rpm 840 910 Refrigerant filling capacity R410A kg 0 95 1 Measured under rat...

Page 5: ... 2 4 42 4 58 Compressor Model SNB130FGBH1T Output W 1 300 Current 1 2 A 4 5 5 3 Refrigeration oil Model L 0 7 NEO22 Fan motor Model SIC 71FW F764 1 Current 1 2 A 0 20 0 23 Dimensions W x H x D mm 840 x 710 x 330 Weight kg 57 Special remarks Air flow Rated m3 h 2 252 2 379 Sound level Rated dB A 50 53 Fan speed Rated rpm 630 660 Refrigerant filling capacity R410A kg 2 7 1 Measured under rated opera...

Page 6: ...CRITERIA CURVES 4 MXZ 2HJ40VA 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz Cooling High FUNCTION FAN SPEED Heating High 50 SPL dB A 53 LINE MXZ 3HJ50VA OUTDOOR UNIT MICROPHONE 1m Test conditions Cooling Dry bul...

Page 7: ...7 OUTLINES AND DIMENSIONS 5 MXZ 2HJ40VA Unit mm OBH709A ...

Page 8: ... obstruction 100 or more 350 or more 200 or more 500 or more 2 Service space 100 or more 500 or more 350 or more 350 or more 100 or more Service space Liquid pipe Ø6 35 flared 1 4 C unit connection B unit connection A unit connection Gas pipe Ø9 52 flared 3 8 Liquid pipe Ø6 35 flared 1 4 Gas pipe Ø9 52 flared 3 8 Liquid pipe Ø6 35 flared 1 4 Gas pipe Ø9 52 flared 3 8 MXZ 3HJ50VA Unit mm OBH709A ...

Page 9: ...9 WIRING DIAGRAM 6 MXZ 2HJ40VA E1 ER1 ET1 MXZ 3HJ50VA E1 ER1 ET1 OBH709A ...

Page 10: ...r unit A Indoor unit B Capillary tube Capillary tube Stop valve with strainer 100 Refrigerant flow in cooling Refrigerant flow in heating Discharge temperature thermistor RT62 Stop valve with service port Stop valve with service port Strainer 100 Sub muffler Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 FAN OUT HEX OUT It is irreleva...

Page 11: ...nit union diameter For Indoor unit A Liquid 6 35 1 4 Gas 9 52 3 8 Indoor unit B Liquid 6 35 1 4 Gas 9 52 3 8 Indoor unit C Liquid 6 35 1 4 Gas 9 52 3 8 a b c Outdoor unit Indoor units 15 m 10 m 15 m Max Height difference Piping length each indoor unit a b c 25 m Total piping length a b c 50 m Bending point for each unit 25 Total bending point 50 It is irrelevant which unit is higher Refrigerant pi...

Page 12: ...indoor unit installation manual about the method for stopping the operation If too much refrigerant has been added to the air conditioner system the pressure may not drop to 0 05 MPa Gauge approximately 0 5 kgf cm or the protection function may operate due to the pressure increase in the high pressure refrigerant circuit If this occurs use a refrigerant collecting device to collect all of the refr...

Page 13: ...dry bulb temperature and the indoor outlet air wet and dry bulb temperature for your reference at service How to measure the indoor air wet and dry bulb temperature difference 1 Attach at least 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet The thermometers must be attached to the...

Page 14: ...15 8 14 1 12 3 10 5 35 class Indoor air Dry bulb temperature difference C Indoor air Wet bulb temperature difference C Outdoor intake air Dry bulb temperature C 46 45 46 45 Outdoor intake air Dry bulb temperature C Indoor intake air Wet bulb temperature C Indoor intake air Wet bulb temperature C 50 class 7 4 6 8 6 2 5 6 5 1 4 5 6 7 6 1 5 6 5 1 4 6 4 1 10 5 9 6 8 7 7 9 7 1 6 3 35 class 25 class MXZ...

Page 15: ...requency Hz 0 50 100 150 0 5 1 0 1 5 HEAT Capacity HEAT Total input Frequency Hz 0 50 100 150 0 5 1 0 1 5 Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 HEAT Capacity HEAT Total input Frequency Hz 0 50 100 150 0 5 1 0 1 5 Frequency Hz 0 50 100 150 0 5 1 0 1 5 25 class unit MXZ 2HJ40VA 35 class unit 8 2 CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY single operation OBH709A ...

Page 16: ...z COOL Total input 0 50 100 150 0 5 1 0 1 5 Frequency Hz 0 50 100 150 0 5 1 0 1 5 HEAT Capacity HEAT Total input Frequency Hz 0 50 100 150 0 5 1 0 1 5 Frequency Hz 0 50 100 150 0 5 1 0 1 5 HEAT Capacity HEAT Total input Frequency Hz 0 50 100 150 0 5 1 0 1 5 Frequency Hz 0 50 100 150 0 5 1 0 1 5 HEAT Capacity HEAT Total input Frequency Hz 0 50 100 150 0 5 1 0 1 5 2 0 Frequency Hz 0 50 100 150 0 5 1...

Page 17: ... humidity Ambient temperature Ambient humidity 50 60 70 50 60 70 42Hz 42Hz 15 14 13 12 11 10 9 8 7 15 20 25 30 35 0 7 0 8 0 9 1 0 1 1 1 2 1 3 1 4 1 5 15 20 25 30 35 0 1 2 3 4 5 Outdoor low pressure MPa Gauge Outdoor unit current A Ambient temperature Ambient humidity Ambient temperature Ambient humidity 50 60 70 50 60 70 42Hz 42Hz 15 14 13 12 11 10 9 8 7 15 20 25 30 35 0 7 0 8 0 9 1 0 1 1 1 2 1 3 ...

Page 18: ...bient temperature 48Hz Outdoor unit current A 0 5 10 15 20 25 0 1 2 3 4 5 Ambient temperature 48Hz Outdoor unit current A 35 class unit 25 class unit 35 class unit MXZ 3HJ50VA 50 class unit 0 5 10 15 20 25 3 4 5 6 7 8 Ambient temperature 47Hz Outdoor unit current A 0 5 10 15 20 25 3 4 5 6 7 8 Ambient temperature 47Hz Outdoor unit current A 0 5 10 15 20 25 3 4 5 6 7 8 Ambient temperature 47Hz Outdo...

Page 19: ...r Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protection Defrost thermistor Heating Defrosting Fin temperature thermistor Protection Ambient temperature thermistor Control Protection Outdoor heat exchanger temperature thermistor Cooling Control Protection Capacity code Control MXZ 2HJ40VA MXZ 3HJ50VA OBH709A ...

Page 20: ... setting is required to activate this function Please explain this function to your customers and ask them whether they want to use it How to lock the operation mode 1 Turn OFF the breaker and make sure that the LED goes off 2 Set SW1 or SW2 as shown in the figure below 3 Turn ON the breaker 10 2 LOCKING THE OPERATION MODE OF THE AIR CONDITIONER COOL DRY HEAT MXZ 2HJ40VA SW1 on the outdoor display...

Page 21: ...ING This outdoor unit has an automatic line correcting function which automatically detects and corrects improper wiring or piping MXZ 2HJ40VA Improper wiring or piping can be automatically detected when one indoor unit is operated in COOL mode for 30 minutes When improper wiring or piping is detected wiring lines are corrected A to B B to A with the software NOTE This function may not work due to...

Page 22: ...tion during detection LED1 Red LED2 Yellow LED3 Green Lighted Lighted Once LED indication after detection LED1 Red LED2 Yellow LED3 Green Indication Lighted Not lighted Lighted Completed Problem corrected Normal Once Once Once Not completed Detection failed Other indications Refer to SAFETY PRECAUTIONS WHEN LED FLASHES located behind the service panel Make sure that the valves are open and the pip...

Page 23: ...heat control 1 Turn OFF the breaker and make sure that the LED goes off 2 Set the 4 of SW2 as shown figure below to OFF to activate pre heat control function 3 Turn ON the breaker MXZ 2HJ40VA How to activate pre heat control 1 Turn OFF the breaker and make sure that the LED goes off 2 Set the 4 of SW2 as shown figure below to ON to activate pre heat control function 3 Turn ON the breaker NOTE Pre ...

Page 24: ...unit first with the remote controller and after confirming the horizontal vane is closed turn OFF the breaker and or disconnect the power plug 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the P C board 3 When removing the electrical parts be careful of the residual voltage of smoothing capacitor 4 When removing the P C board hold the edge of ...

Page 25: ...e TEMPERATURE buttons to adjust the set temperature to 25 C 1 1 Regardless of normal or abnormal condition 2 short beeps are emitted as the signal is received The outdoor unit is abnormal Check the blinking pattern and make sure that the abnormal point with the outdoor unit failure mode table 11 2 3 Make sure to check at least two consecutive blinking cycles 2 Repair the failure parts The outdoor ...

Page 26: ...n door gas pipe temperature exceeds 70ºC during heating Check the refrigerant circuit and the refrigerant amount Check the stop valve 7 time flash Fin temperature 3 times Not lighted The fin temperature exceeds 90ºC during operation Check the around outdoor unit Check the outdoor unit air passage P C board temperature 4 times Not lighted The P C board temperature exceeds 80ºC during operation Refe...

Page 27: ...S YDOYH Refer to 11 6 Check of outdoor thermistors Refer to 11 6 Check of outdoor thermistors Overcurrent protection cut out operates 3 consecutive times within 1 minute after the compressor gets started or converter protection or bus bar voltage protection cut out operates 3 consecutive times within 3 minutes after start up Thermistor shorts or opens during compressor running 28 A current flows i...

Page 28: ...is performed continuously three times it does not mean the abnormality in outdoor power system LEV and drain pump Lighted 6 times Lighted 7 times 5 times Not lighted 5 times Not lighted 5 times 6 times Not lighted Not lighted The indoor unit detects an abnormality in the LEV and drain pump Lighted Lighted Abnormal point Failure mode protection Condition Remedy Indoor outdoor unit failure mode reca...

Page 29: ... thermistor P C board temperature thermistor Lighted 4 times Ambient temperature thermistor A short or open circuit is detected in the thermistor during operation A short or open circuit is detected in the thermistor during operation 5 times Lighted Overcurrent 3 times Not lighted Discharge temperature protection Fin temperature protection P C board temperature protection High pressure protection ...

Page 30: ...2 Yellow Abnormal point Condition Remedy Indication Condition No Symptom Outdoor unit operates normally 23 24 Outdoor unit operates Outdoor display P C board Parts side Lighted 8 times Lighted Converter protection A failure is detected in the operation of the converter during operation 22 Check the voltage of power supply Replace the inverter P C board LED1 LED2 ON OFF 2 5 second OFF 2 5 second OF...

Page 31: ...13 times Not lighted 2XWGRRU IDQ PRWRU 5HIHU WR KHFN RI RXWGRRU IDQ PRWRU Lighted 8 times XUUHQW VHQVRU protection 5HSODFH WKH SRZHU 3 ERDUG Lighted 11 times RPPXQLFDWLRQ SURWHFWLRQ EHWZHHQ 3 ERDUGV KHFN WKH FRQQHFWLQJ ZLUH EHWZHHQ WKH RXWGRRU FRQWURO 3 ERDUG DQG WKH SRZHU 3 ERDUG Lighted 12 times Zero cross detecting circuit protection KHFN WKH FRQQHFWLQJ ZLUH EHWZHHQ WKH RXWGRRU FRQWURO 3 ERDUG ...

Page 32: ...e Lighted Once Lighted The outdoor heat exchanger temperature exceeds 58 C during operation 9 times Lighted Inverter check mode Lighted Lighted Normal The unit is operated with emergency operation switch The primary current exceeds 15 A The current of the compressor exceeds 12 A The indoor gas pipe temperature exceeds 45 C during heating The indoor gas pipe temperature falls 3 C or below during co...

Page 33: ...istance between terminals with a tester Winding temperature 10 C 40 C Normal Each phase MXZ 2HJ40VA MXZ 3HJ50VA 1 49 1 84 0 86 1 06 Outdoor fan motor MXZ 2HJ40VA Measure the resistance between lead wires with a tester Part temperature 10 C 40 C Normal Each phase MXZ 2HJ40VA 12 16 Outdoor fan motor MXZ 3HJ50VA MXZ 3HJ50VA Refer to 11 6 R V coil Measure the resistance with a tester Part temperature ...

Page 34: ...verter P C board Check the power supply and correct them Replace the outdoor display P C board Replace the inverter P C board Is there voltage of 230 VAC between LD66A and LD70 on the inverter P C board Replace the reactor Is there voltage of 325 VDC between DB61 and DB61 on the inverter P C board Replace the inverter P C board Is there voltage of 5 VDC between CN936 and CN936 on the outdoor displ...

Page 35: ... filter P C board 230 VAC Is the input voltage to the outdoor electronic control P C board 325 VDC Check the power supply and correct them Replace the outdoor control P C board Replace the noise filter P C board Is the input voltage to the power P C board 230 VAC Replace the reactor Turn ON the breaker No Yes Yes No Yes No Yes No Replace the outdoor power P C board OBH709A ...

Page 36: ...ctronic control P C board 1 4 2 The LED indicates the status of serial communication Check the communication status Replace the inverter P C board or the outdoor control P C board 3 4 If the trouble sometimes occurs possible causes are as follows 3RRU FRQQHFWLRQ RI WKH LQGRRU outdoor connecting wire Check for intermediate connection of the indoor outdoor connecting wire loose connection to the ter...

Page 37: ...ltage of 50 VAC 250 VAC 1 2 Turn OFF the breaker and measure the compressor winding resistance between the compressor terminals Is there resistance between each terminal normal Refer to 11 5 Reconnect the lead wire of compressor 3 minutes after turning ON the breaker start EMERGENCY OPERATION Clarify the causes by counting time until the inverter stops 0 to 10 seconds compressor layer short 10 to ...

Page 38: ...e lead wire leading to the compressor 3 minutes after turning ON the breaker start EMERGENCY OPERATION Thermistor Defrost Discharge temperature Fin temperature Ambient temperature Outdoor heat exchanger temperature Symbol RT61 RT62 RT64 RT65 RT68 Connector Pin No CN641 pin1 and pin2 CN641 pin3 and pin4 CN642 pin1 and pin2 CN643 pin1 and pin2 CN644 pin1 and pin3 Inverter P C board Outdoor control P...

Page 39: ...4 LEV A CN725 LEV B MXZ 3HJ50VA CN791 LEV A CN792 LEV B CN793 LEV C CN795 LEV E Normal Is the resistance of the LEV coil normal Refer to 11 5 Replace the inverter P C board or the outdoor control P C board Replace LEV coil In cooling the heat exchanger of non operating indoor unit has frosted In heating non operating indoor unit gets warm MXZ 2HJ40VA MXZ 3HJ50VA CN724 CN725 Inverter P C board Outd...

Page 40: ... motor manually and measure the voltage of CN931 Between and Between and Between and Is the resistance of outdoor fan motor normal Refer to 11 5 Does the outdoor fan motor rotate smoothly Does the voltage between each terminal become 5 VDC and 0 VDC repeatedly Replace the outdoor fan motor Replace the inverter P C board or the outdoor control P C board No Yes Yes No Yes No MXZ 2HJ40VA CN931 CN932 ...

Page 41: ...e resistance connect the negative end of the tester to pin 4 To measure the voltage connect the negative end of the tester to pin 4 Voltage between pin 4 and 6 should be measured within 1 minute after the operation starts pin 1 pin 4 pin 5 pin 4 pin 6 pin 4 pin 7 pin 4 Voltage 15 VDC 325 VDC 1 5 VDC CN931 pin 1 pin 4 pin 5 pin 4 pin 6 pin 4 Is the voltage of connector CN931 normal Refer to right t...

Page 42: ...e the 4 way valve Replace the R V coil Is there normal resistance to R V coil Refer to 11 5 1 Disconnect the lead wire leading to the compressor 2 3 minutes after turning ON the breaker start EMERGENCY OPERATION in COOL mode Is there voltage of 230 VAC between pin 1 and pin 2 at connector CN721 Replace the inverter P C board Replace the 4 way valve 7KH KHDWLQJ RSHUDWLRQ GRHV QRW RSHUDWH 7KH FRROLQ...

Page 43: ...V coil Is there voltage 230 VAC between the pin1 and pin3 at connector CN711 Replace the noise filter P C board Is there normal resistance to R V coil Refer to 11 5 1 Disconnect the lead wire leading to the compressor 2 3 minutes after turning ON the breaker start EMERGENCY OPERATION in COOL mode Is there voltage of 230 VAC between pin1 and pin2 at connector CN712 Replace the 4 way valve Replace t...

Page 44: ...etween each terminal Reconnect CN681 Turn ON the breaker to the indoor and the outdoor units 3 minutes later start EMERGENCY OPERATION Is HPS protection displayed immediately after compressor starts Replace HPS Replace the outdoor control P C board Normal When the operation frequency does not go up from lowest frequency MXZ 3HJ50VA CN681 Outdoor control P C board OBH709A ...

Page 45: ... P C board Turn OFF the breaker before removing P C board Confirm LED1 indication lamp on the outdoor control P C board Turn ON the breaker Start operation Blink 6 times Replace the outdoor control P C board Lighting Replace the outdoor control P C board Blink 9 times Replace the power P C board Confirm LED1 indication lamp on the outdoor control P C board Turn ON the breaker Start operation Norma...

Page 46: ...8 CN644 Smoothing capacitor C61 C62 C63 R V coil CN721 FUSE F701 T3 15AL250V 230 VAC X64 LD66B 230 VAC LD61 LD62 230 VAC CN601 Serial signal A CN601 Serial signal B CN601 CN602 Output to drive outdoor fan motor CN932 LEV A coil CN724 LEV B coil CN725 Temperature C Discharge temperature thermistor RT62 5HVLVWDQFH N 0 100 200 300 400 500 600 700 800 0 10 20 30 40 50 60 70 80 90 100110120 20 10 0 10 ...

Page 47: ...B 12 24 VDC Serial signal Room A 12 24 VDC CN621 CN611 CN601 Input SW2 CN795 12 VDC pulse wave Temperature C Discharge temperature thermistor RT62 5HVLVWDQFH N 0 100 200 300 400 500 600 700 800 0 10 20 30 40 50 60 70 80 90 100110120 20 10 0 10 20 30 40 100 90 80 70 60 50 40 30 20 10 0 Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Tem...

Page 48: ...ic control P C board 5 VDC pulse wave 2 5 Zero cross signal 3 4 Not used 6 5 15V 7 5 15V 325 370 VDC Output Red White 1 3 0 10 20 30 40 50 60 70 80 200 180 160 140 120 100 80 60 40 20 0 Resistance kΩ Temperature C Fin temperature thermistor RT64 Signal reception From electronic control P C board 5 VDC pulse wave CN9 Fin temperature thermistor RT64 MXZ 2HJ40VA 4 Outdoor display P C board SW1 GND 5V...

Page 49: ... 5 Noise filter P C board 230 VAC Output F64 FUSE T2AL250V CN901 To power P C board CN904 To power P C board CN903 To power P C board CN62 To outdoor control P C board F65 FUSE T6 3AL250V CN61 230 VAC Output OBH709A ...

Page 50: ...ing 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 The terminal which has the locking mechanism can be detached as shown below There are two types Refer to 1 and 2 of the terminal with locking mechanism The terminal without locking mechanism can be detached...

Page 51: ... the top panel and the cabi net Refer to 1 2 Disconnect the power supply and indoor outdoor con necting wire and remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Remove the R V coil 4 Removing the discharge temperature thermistor defrost thermistor and outdoor heat exchanger temperature thermistor 1 Remove the service panel the top panel and the cabi net Refer to 1 2 Di...

Page 52: ...on necting wire and remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm2 0 MPa 5 Detach the brazed part of the suction and the dis charge pipe connected with compressor 6 Remove the nuts of compressor legs 7 Remove the compressor 8 Detach the brazed part of pipes...

Page 53: ...or con necting wire 3 Remove the screws of the cabinet and remove the cabinet 4 Remove the screws of the back panel and remove the back panel Photo 3 53 Photo 2 Photo 1 Screws of the cabinet Screws of the top panel Screw of the cabinet Screws of the cabinet Screws of service panel Screw of the top panel Screws of the cabinet Screws of the cabinet Screws of the sub panel Photo 3 Screw of the rear g...

Page 54: ...on the noise filter P C board 9 Remove the noise filter P C board 3 Removing the reactor 1 Remove the service panel Refer to 1 2 Remove the top panel cabinet back panel and the electrical parts Refer to 1 and 2 3 Disconnect the reactor lead wire from the terminal of the reactor 4 Remove the screws of the reactor and remove the reactor 4 Removing the fan motor 1 Remove the service panel the top pan...

Page 55: ...roof felt Photo 7 10 Detach the brazed parts of the compressor suction and discharge pipes 11 Remove the compressor nuts and remove the com pressor 12 Detach the brazed parts of 4 way valve and pipe 6 Removing the expansion valve 1 Remove the service panel Refer to 1 2 Remove the top panel the cabinet and the back panel Refer to 1 Gas recovery is not required if the unit is pumped down 3 Remove th...

Page 56: ...ibuted in Sep 2015 No OBH709 REVISED EDITION A Distributed in Jan 2015 No OBH709 Made in Japan New publication effective Sep 2015 Specifications are subject to change without notice HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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