Hitachi RAM-55QH4 Service Manual Download Page 70

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Fig. 2-1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with
each other.

Indoor P.W.B.

Outdoor P.W.B.

Terminal board

D101

I/F 0V

C821

R821

C822

I/F 0V

IF transmit
output (SDO)

IF receive
input (SDI)

Micro
computer

12V

IC8

R283

Q201

HIC

R813

R812

C802

Q803

C804

R811

R810

SDO1

SDI1

L801

L811

C801

R802 Q801

R801

R803

D209

C805

NF COIL

C802

C216

R263

R262

R261

R260

D206

C214

Q206

R254

R255

R258

R257

R256

R259

C806

C804

Interface
relay

35V

(Communications from indoor micro computer to outdoor micro computer)

(Communications from outdoor micro computer to indoor micro computer)

Fig. 2-1 Indoor / Outdoor interface Circuit

Summary of Contents for RAM-55QH4

Page 1: ...ERATING CYCLE DIAGRAM 73 DESCRIPTION OF MAIN CIRCUIT OPERATION 77 TROUBLE SHOOTING 108 DISASSEMBLY AND REASSEMBLY 115 PARTS LIST AND DIAGRAM 118 RAM 55QH4 RAM 65QH4 After installation NOTE This manual describes only points that differ from RAF 25 50NH4 RAD 25 40QH4 and RAM 70 80QH4 TC No 0757EF RAK 25 35 50NH4 TC No 0761EF RAD 25 40NH4 RAI 25 40NH4 TC No 0763EF for items not described in this manu...

Page 2: ... be accurately calibrated in advance 7 In installing the unit having been repaired be careful to prevent the occurence of any accident such as electrical shock leak of current or bodily injury due to the drop of any part 8 To check the insulation of the unit measure the insulation resistance between the power cord plug and grounding terminal of the unit The insulation resistance should be 1M or mo...

Page 3: ...of parts Even rejected goods should be handled in the same way Fig 1 Conductive Container 2 When any part is handled uncovered in counting packing and the like the handling person must always use himself as a body earth Make yourself a body earth by passing one M ohm earth resistance through a ring or bracelet 3 Be careful not to touch the parts with your clothing when you hold a part even if a bo...

Page 4: ... the screwed part using a rag plate Soldering iron Grounding wire Fig 4 Grounding a soldering iron Use a high insulation mode 100V 10M or higher when ordinary iron is to be used 7 In checking circuits for maintenance inspection or some others be careful not to have the test probes of the measuring instrument shortcircuit a load circuit or the like Metal plate of aluminium stainless steel etc Stapl...

Page 5: ...casion that the cooling and heating operation does not start for 3 minutes it is not abnormal and this is the result of the operation of IC delay circuit This IC delay circuit ensures that there is no danger of blowing fuse or damaging parts even if operation is restarted accidentally 5 This room air conditioner should not be used at the cooling operation when the outside temperature is below 10 C...

Page 6: ... NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL 40 W NO NO NO YES YES 5 0A G4A NO NO YES NO 450NR YES YES IC NO 1650g WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNIT PIPES REFRIGERANT CHARGING VOLUME Refrigerant 410A RAM 55QH4 RAM 65QH4 JU1013D2 MAX 35m MAX 45m RAM 65QH4 In case the pipe length is more than 35m add refrigerant R410 at 20gram per every meter exceeds RAM 55...

Page 7: ...R FACTOR MAXIMUM LENGTH OF PIPING STANDARD RAM 55QH4 1ø 220 240V 50Hz 16 5 40 1 50 5 90 18 430 5 120 20 130 1 795 200 1 980 10 27 8 3 7 6 99 7 20 1 50 7 20 24 560 5 120 24 560 2 100 200 2 100 11 70 9 6 8 8 99 MAX 35m TWO UNIT TOTAL CE EMC LVD RAM 55QH4 MODEL W PACKING mm H D cu ft 1 008 698 394 9 79 53 GROSS WEIGHT kg 6 35D 9 52DX2 FLARENUTSIZE SMALL LARGE INDOOR SUCTION TEMPERATURE C COOLING OPER...

Page 8: ...WER FACTOR MAXIMUM LENGTH OF PIPING STANDARD RAM 65QH4 1ø 220 240V 50Hz 16 6 30 1 50 6 60 21 510 5 120 22 530 2 095 200 2 200 10 26 9 7 8 9 99 7 20 1 50 7 20 24 560 5 120 24 560 1 900 200 2 100 12 93 8 8 8 0 99 MAX 45m THREE UNIT TOTAL CE EMC LVD RAM 65QH4 MODEL W PACKING mm H D cu ft 1 008 698 394 9 79 55 GROSS WEIGHT kg 6 35D 9 52DX3 FLARENUTSIZE SMALL LARGE INDOOR SUCTION TEMPERATURE C COOLING ...

Page 9: ...0 3 90 4 00 1 00 4 50 5 00 1 00 5 60 2 50 2 50 1 50 5 60 2 17 3 03 1 50 5 70 2 10 3 30 1 50 5 90 2 70 2 70 1 50 5 90 1 80 3 60 1 50 5 90 2 50 2 90 1 50 5 90 780 200 980 1160 200 1280 1330 200 1480 1780 200 1960 1650 200 1820 1730 200 1900 1795 200 1980 1795 200 1980 1795 200 1980 1795 200 1980 3 6 3 3 5 3 4 9 6 1 5 6 8 2 7 5 7 6 6 9 7 9 7 3 8 2 7 6 8 2 7 6 8 2 7 6 8 2 7 6 3 90 1 10 4 70 4 80 1 10 ...

Page 10: ...0 6 60 2 67 3 33 1 50 6 60 2 10 2 10 2 10 1 50 6 60 1 85 1 85 2 60 1 50 6 60 780 200 980 1160 200 1280 1330 200 1480 1780 200 1960 1650 200 1820 1730 200 1900 1795 200 1980 1795 200 1980 1795 200 1980 1795 200 1980 1995 200 2200 1995 200 2200 1995 200 2200 2095 200 2200 2095 200 2200 3 6 3 3 5 3 4 9 6 1 5 6 8 2 7 5 7 6 6 9 7 9 7 3 8 2 7 6 8 2 7 6 8 2 7 6 8 2 7 6 9 2 8 4 9 2 8 4 9 2 8 4 9 6 8 8 9 6...

Page 11: ...TING COOLING HEATING RAK 25NH4 RAF 25NH4 RAD 25NH4 RAI 25NH4 RAK 35NH4 RAD 40NH4 RAI 40NH4 RAK 50NH4 RAF 50NH4 2 5 2 5 2 5 2 5 3 5 4 0 4 0 5 0 5 0 1 00 2 80 1 00 2 80 1 00 2 80 1 00 2 80 1 00 3 90 1 00 4 50 1 00 4 50 1 00 5 60 1 00 5 60 1 10 4 70 1 10 4 70 1 10 4 70 1 10 4 70 1 10 5 80 1 10 6 80 1 10 6 80 1 10 7 20 1 10 7 20 11 17 11 17 11 17 11 17 16 24 18 28 18 28 23 34 23 34 14 18 14 18 14 18 1...

Page 12: ...ATING COOLING HEATING RAK 25NH4 RAF 25NH4 RAD 25NH4 RAI 25NH4 RAK 35NH4 RAD 40NH4 RAI 40NH4 RAK 50NH4 RAF 50NH4 2 5 2 5 2 5 2 5 3 5 4 0 4 0 5 0 5 0 1 00 2 80 1 00 2 80 1 00 2 80 1 00 2 80 1 00 3 90 1 00 4 50 1 00 4 50 1 00 5 60 1 00 5 60 1 10 4 70 1 10 4 70 1 10 4 70 1 10 4 70 1 10 5 80 1 10 6 80 1 10 6 80 1 10 7 20 1 10 7 20 11 17 11 17 11 17 11 17 16 24 18 28 18 28 23 34 23 34 14 18 14 18 14 18 ...

Page 13: ...room size is determined based on the conditions below Climate is in the temperate zone like Tokyo Japan For usual residential use Smaller figure is for light construction which means light thermally sealed Larger figure is for heavy constructions which means well thermally sealed SUITABLE ROOM SIZE TO INSTALL m2 6 35 9 52D 6 35 9 52D TWO UNITS 2 5 2 5 2 5 3 5 2 5 4 0 3 5 3 5 2 5 5 0 3 5 4 0 12 15 ...

Page 14: ...o Japan For usual residential use Smaller figure is for light construction which means light thermally sealed Larger figure is for heavy constructions which means well thermally sealed SUITABLE ROOM SIZE TO INSTALL m2 No 3 6 35 9 52D 6 35 9 52D 6 35 9 52D TWO UNITS THREE UNITS 2 5 2 5 2 5 3 5 2 5 4 0 3 5 3 5 2 5 5 0 3 5 4 0 4 0 4 0 3 5 5 0 4 0 5 0 2 5 2 5 2 5 2 5 2 5 3 5 12 15 12 15 11 14 14 18 10...

Page 15: ...GTH 1 Total 35m maximum pipe length 2 Pipe length for one indoor unit maximum 25m HIGHT DIFFERENCE 1 Hight maximum 10m 2 Hight difference between each indoor unit 5m L1 L2 To the outdoor unit up to two indoor units can be connected until the total value of capacity from 5 0kW to 7 50kW Make sure to connect to two indoor units ...

Page 16: ...IPE LENGTH 1 Total 45m maximum pipe length 2 Pipe length for one indoor unit maximum 25m HIGHT DIFFERENCE 1 Hight maximum 10m 2 Hight difference between each indoor unit 5m L1 L2 L3 To the outdoor unit up to three indoor units can be connected until the total value of capacity from 5 0kW to 9 0kW Make sure to connect to two or three indoor units ...

Page 17: ...service valve Tightening torque 13 7 18 6 N m 140 190 kgf cm Hold the handle of the side cover Slide down and takeoff the corner hook then pull Reverse these stepswhen installing Please face this side suction side of the unit to the wall Please remove side plate when connecting the piping and connecting cord Slide lower The space indicated with a mark is required to guarantee the air conditioner s...

Page 18: ...place Small diameter side service valve Tightening torque 13 7 18 6 N m 140 190 kgf cm Hold the handle of the side cover Slide down and takeoff the corner hook then pull Reverse these stepswhen installing Please face this side suction side of the unit to the wall Please remove side plate when connecting the piping and connecting cord Slide lower The space indicated with a mark is required to guara...

Page 19: ...valve 4 Perform air purge and gas leak inspection 2 Apply refrigerant oil to flare nut sections of servicevalve and pipings 5 Wrap the provided insulating material around sidepiping using vinyl tape 3 Match center of piping to large diameter side service valve and tank assembly and tighten flarenut first by hand then securely tighten using torque wrench Install the outdoor unit on a stable flat su...

Page 20: ...Indoor unit 2 Terminal indications Grounding rod optional Earth line and grounding rod are not supplied Please use optional items below If earth line cannot be taken from the power supply connection use the optional grounding rod to do earthing Type of grounding rod SP EB 2 Length 900mm Connection of the power cord and connecting cord Securely screw in the power cord and connecting cord so that it...

Page 21: ...ween the convex sections Earth wire Earth Circuit breaker L N C1 D1 C2 D2 C3 D3 Indoor unit 1 Indoor unit 2 Indoor unit 3 Terminal indications Grounding rod optional Earth line and grounding rod are not supplied Please use optional items below If earth line cannot be taken from the power supply connection use the optional grounding rod to do earthing Type of grounding rod SP EB 2 Length 900mm Conn...

Page 22: ... Notch for anchor bolt 2 ø12 Notchs More than More than More than 100 More than 700 100 100 Service space ATTENTION During service before opening the side cover please switch off power supply Note 1 Insulated pipes should be used for both small and large diameter pipes 2 Piping length should be within 25m for one room and within 35m in total 3 Height difference of piping between indoor unit and ou...

Page 23: ...lt 2 ø12 Fixing hole 507 198 57 12 37 Notch for anchor bolt 2 ø12 Notchs More than More than More than 100 More than 700 100 100 Service space ATTENTION During service before opening the side cover please switch off power supply Note 1 Insulated pipes should be used for both small and large diameter pipes 2 Piping length should be within 25m for one room and within 45m in total 3 Height difference...

Page 24: ...L POWER SOURCE OUTPUT BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GREEN RED RED BLK BLACK PNK PINK VIO VIOLET RAM 55QH4 RAM 65QH4 DC 140 330V 40W RESISTANCE VALUE 20 C 68 F 75 C 167 F M RED BLK WHT YEL BLU Control circuit built in 140 330V 15V 0V 0 6V 0 15V ...

Page 25: ...TAGE RATED FREQUENCY POLE NUMBER COMPRESSOR Compressor Motor Specifications CONNECTION 25 C 68 F 75 C 167 F RESISTANCE VALUE 2M 1 063 2M 1 268 RAM 55QH4 RAM 65QH4 JU1013D2 SINGLE DC 280 330V 50Hz 4 U V W M M M WHITE YELLOW RED WHITE RED YELLOW ...

Page 26: ... ROOM TEMPERATURE 27 C INDOOR UNITS OPERATE 5 5 10 1060 1520 1740 1795 1920 5 42 5 55 5 40 5 00 4 3 2 1 0 3000 2000 1000 INPUT W AMBIENT TEMP C COOLING CAPACITY kW 0 20 25 30 35 40 45 CAPACITY DIAGRAM RELATED TO THE AMBIENT TEMPERATURE MODEL RAM 55QH4 ...

Page 27: ...OST WHEN TWO HEATING CAPACITY ROOM TEMPERATURE 20 C INDOOR UNITS OPERATE 0 0 0 7 0 C 5 5 C 8 5 C 500 1000 2000 1500 2500 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 INPUT W AMBIENT TEMP C HEATING CAPACITY kW 15 10 5 0 5 10 15 CAPACITY DIAGRAM RELATED TO THE AMBIENT TEMPERATURE MODEL RAM 55QH4 ...

Page 28: ...Y ROOM TEMPERATURE 27 C INDOOR UNITS OPERATE 5 4 3 2 1 0 3000 2000 1000 INPUT W AMBIENT TEMP C COOLING CAPACITY kW 0 20 25 30 35 40 45 5 95 1240 1765 2030 2095 2240 6 32 6 50 6 30 5 85 CAPACITY DIAGRAM RELATED TO THE AMBIENT TEMPERATURE MODEL RAM 65QH4 ...

Page 29: ...ST WHEN THREE HEATING CAPACITY ROOM TEMPERATURE 20 C INDOOR UNITS OPERATE 0 0 0 7 0 C 5 5 C 8 5 C 500 1000 2000 1500 2500 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 INPUT W AMBIENT TEMP C HEATING CAPACITY kW 15 10 5 0 5 10 15 CAPACITY DIAGRAM RELATED TO THE AMBIENT TEMPERATURE MODEL RAM 65QH4 ...

Page 30: ...LATED TO THE PIPING LENGTH MODEL RAM 55QH4 1 0 0 9 0 8 0 7 0 6 0 5 10 20 30 25 35 15 PIPING LENGTH m CHANGE RATIO OF CAPACITY HEATING 1 0 0 9 0 8 0 7 0 6 0 5 10 20 30 25 35 15 PIPING LENGTH m CHANGE RATIO OF CAPACITY COOLING ...

Page 31: ... 30 CAPACITY DIAGRAM RELATED TO THE PIPING LENGTH MODEL RAM 65QH4 ...

Page 32: ...00 2000 4000 8000 S o u n d L e v e l d B w a v e l e n g t h M a i n band O c t a v e H z p r e s s u r e APPROXIMATE THRESHOLD FOR NOISE CONTINUROUS HEARING NC 40 NC 20 NC 30 NC 50 NC 60 NC 70 SOUND PRESSURE LEVEL MODEL RAM 55QH4 RAM 65QH4 Heating ...

Page 33: ...00 2000 4000 8000 S o u n d L e v e l d B w a v e l e n g t h M a i n band O c t a v e H z p r e s s u r e APPROXIMATE THRESHOLD FOR NOISE CONTINUROUS HEARING NC 40 NC 20 NC 30 NC 50 NC 60 NC 70 SOUND PRESSURE LEVEL MODEL RAM 55QH4 RAM 65QH4 Cooling ...

Page 34: ...SOR SYSTEM POWER MODULE REACTOR DIODE STACK D15VBA60 POWER RELAY ICP RELAY NF COIL 1 COIL VARISTOR 1 VARISTOR 3 POWER P W B MAIN P W B C002 C001 C025 C024 C023 C022 L007 C003 R004 C006 R002 VARISTOR 2 R005 DIODE STACK C021 C020 REVERSING VALVE FAN MOTOR BLU BLUE GRY GRAY BLK BLACK YEL YELLOW ORN ORANGE PNK PINK BRN BROWN GRN GREEN VIO VIOLET WHT WHITE RED RED LEGEND CAUTION The marked parts are ve...

Page 35: ...MODULE REACTOR DIODE STACK D15VBA60 POWER RELAY ICP RELAY NF COIL 1 COIL VARISTOR 1 VARISTOR 3 POWER P W B MAIN P W B C002 C001 C025 C024 C023 C022 L007 C003 R004 C006 R002 VARISTOR 2 R005 DIODE STACK C021 C020 REVERSING VALVE FAN MOTOR BLU BLUE GRY GRAY BLK BLACK YEL YELLOW ORN ORANGE PNK PINK BRN BROWN GRN GREEN VIO VIOLET WHT WHITE RED RED LEGEND CAUTION The marked parts are very important ones...

Page 36: ...EG1 SEG0 SEG43 SEG42 SEG41 SEG40 P40 P41 P42 P43 P00 P01 P02 P03 P10 P11 P12 P13 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 BEEP P20 P30 P31 NCVL C1 VL C2 VL C3 XC IN XC OUT VDD X OUT X IN RESET CARR P23 P22 P21 VSS IC 1 M3455OM6A 504FP LCD 1 C8 50v 1u K 1 D3 RB425D 1 2 K2K3 K4 K5 P10 P11 P12 K6 K7 K8 K8 K10 K11K12 K18 K17 K15 K16 K13 K14 D0 D1 D2 D3 R1 100k SW1 R2 P 100k R3 100k R4 100k R5 Q1 2SC3443 or 2SC29...

Page 37: ...CIRCUIT DIAGRAM MODEL RAM 55QH4 39 L C023 C022 C002 C001 C025 C024 N ...

Page 38: ...CIRCUIT DIAGRAM MODEL RAM 65QH4 41 L C023 C022 C002 C001 C025 C024 N ...

Page 39: ...face 1 Indoor Outdoor Interface 2 Switching power supply 2 Switching power supply 1 Reset circuit Clock circuit Multiplexer Expansion valve thermistor 1 Expansion valve thermistor 2 Expansion valve 1 Expansion valve 2 Expansion valve drive circuit Reversing valve drive circuit Reversing valve EEPROM Fan motor drive circuit M compressor fan motor Indoor unit 1 Indoor unit 2 C1 D1 C2 D2 Power source...

Page 40: ...r Interface 3 Switching power supply 2 Switching power supply 1 Reset circuit Clock circuit Multiplexer Expansion valve thermistor 3 Expansion valve thermistor 1 Expansion valve thermistor 2 Expansion valve 1 Expansion valve 2 Expansion valve 3 Expansion valve drive circuit Reversing valve drive circuit Reversing valve EEPROM Fan motor drive circuit M compressor fan motor Indoor unit 1 Indoor unit...

Page 41: ... 45 ...

Page 42: ...le 1 Fan speed by mode Table 2 Room temperature shift value FWS_M Lo Hi Hi Hi Hi FWKAF_M Overload FCSOY_M Sleep FWHH_M Ultra Hi FCS_M Lo FCL_M Med FDOY_M Sleep FCHH_M Ultra Hi FDS1_M Lo 1 FDS2_M Lo 2 FWL_M Med FWAH_M Set fan speed AUTO FWH_M Set fan speed HI FCAH_M Set fan speed AUTO FCH_M Set fan speed HI SHIFTW_M Fan speed AUTO Hi Med SFTSZW_M Fan speed Lo Sleep SHIFTC_M Cooling operation SHIFTD...

Page 43: ... 1250 min 1 187 FCOPN_M 1020 min 1 1090 min 1 188 FWCLD_M 1060 min 1 1250 min 1 189 FCCLD_M 1020 min 1 1090 min 1 18A FWUDSS_M 400 min 1 400 min 1 18B FWUDSOY_M 640 min 1 660 min 1 18C FWUDS_M 640 min 1 740 min 1 18D FWUDKAF_M 710 min 1 860 min 1 18E FWUDL_M 710 min 1 860 min 1 18F FWUDAH_M 750 min 1 950 min 1 190 FWUDH_M 780 min 1 970 min 1 191 FWUDHH_M 870 min 1 990 min 1 192 FCUDSOY_M 600 min 1...

Page 44: ...shift value FWS_M Lo Hi Hi Hi Hi FWKAF_M Overload FCSOY_M Sleep FWHH_M Ultra Hi FCS_M Lo FCL_M Med FDOY_M Sleep FCHH_M Ultra Hi FDS1_M Lo 1 FDS2_M Lo 2 FWL_M Med FWAH_M Set fan speed AUTO FWH_M Set fan speed HI FCAH_M Set fan speed AUTO FCH_M Set fan speed HI SHIFTW_M Fan speed AUTO Hi Med SFTSZW_M Fan speed Lo Sleep SHIFTC_M Cooling operation SHIFTD_M Dehumidifying operation V 17 0 V 18 9 120 WMA...

Page 45: ...ft value FWS_M Lo Hi Hi Hi Hi FWKAF_M Overload FCSOY_M Sleep FWHH_M Ultra Hi FCS_M Lo FCL_M Med FDOY_M Sleep FCHH_M Ultra Hi FDS1_M Lo 1 FDS2_M Lo 2 FWL_M Med FWAH_M Set fan speed AUTO FWH_M Set fan speed HI FCAH_M Set fan speed AUTO FCH_M Set fan speed HI SHIFTW_M Fan speed AUTO Hi Med SFTSZW_M Fan speed Lo Sleep SHIFTC_M Cooling operation SHIFTD_M Dehumidifying operation V 20 5 V 20 5 120 WMAX_M...

Page 46: ...2000 min 1 145 SDRCT1_C2 3000 min 1 146 TSKTM_C2 60 sec 147 STAROTP_W 4 8 C 148 SDRCT1_W1 2000 min 1 149 TSKTM1_W1 90 sec 14A SDRCT1_W2 3000 min 1 14B TSKTM1_W2 90 sec 14C SDSTEP 1000 min 1 14D TSKSPT 8 sec 14E KYO_RPM 3000 min 1 1BB TDF414 90 sec 1BC DFMXTM 12 min 1 1BD SDRCT2 2000 min 1 1BE TSKTM2 60 sec 1BF DFSTEP 1000 min 1 1C0 TDFSPT 90 sec 1C1 DEFMAX 6000 min 1 1C2 TDF415 90 sec 1C3 DFSTMB 5...

Page 47: ... 53 Outdoortemperature STAROTP_C TSKTM1_C1 Outdoortemperature STAROTP_C TSKTM1_C2 ...

Page 48: ... 55 ...

Page 49: ... 57 ...

Page 50: ... 59 ...

Page 51: ... 61 ...

Page 52: ...l N correction distribution control MODEL RAM 55QH4 Expansion valves The expansion valves are initialized when power is supplied The valve for unit 1 is fully closed 520 pulses and then that for unit 2 is fully opened 480 pulses The valve for unit 2 is fully closed 520 pulses When the valve for unit 1 2 is fully closed 0 pulse start up is possible The start openings are held during the steady spee...

Page 53: ... N correction distribution control TD control N correction distribution control MODEL RAM 65QH4 Expansion valves The expansion valves are initialized when power is supplied The valve for unit 1 is fully closed 520 pulses and then that for unit 2 is fully opened 480 pulses The valve for unit 2 is fully closed 520 pulses and then that for unit 3 is fully opened 480 pulses When the valve for unit 1 2...

Page 54: ...ated DFCTPS 30 seconds before balancing period is finished Synchronized with step up of rotation speed of compressor opened by DFSPPS pulses and reaches MAX opening degree DEFSMX when rotation speed of compressor reaches DEFMAX Compressor Balancing period for TDF414 seconds Starting of reversing cycle period by SDRCT2 min 1 for Released by condition 1 or 2 during reversing cycle period TDF415 Shif...

Page 55: ...efrosting sequence DFSTEPmin 1 TDFSPT sec Defrosting request Defrosting request T_4BEN_DEF DFPSMX DFCTPS DFSPPS Pulse DFCTPS DFCTPS PSTARTH PSTARTH DFSPPS Pulse Hold 500ms Hold 480 0 Outdoor temperature STAROTP_W TSKTMI_W1 Outdoor temperature STAROTP_W TSKTMI_W2 Unit 1 Unit 1 Unit 2 Unit 1 Unit 2 Unit 1 Unit 2 Compressor rotation speed Outdoor fan Heating output Cooling output Defrosting signal Re...

Page 56: ...ec Defrosting request Defrosting request Defrosting request T_4BEN_DEF DFPSMX DFPSMX DFCTPS DFCTPS DFSPPS Pulse DFCTPS DFCTPS DFCTPS PSTARTH PSTARTH PSTARTH DFSPPS Pulse DFSPPS Pulse Hold 500ms Hold 500ms Hold Hold 480 0 480 0 Outdoor temperature STAROTP_W TSKTMI_W1 Outdoor temperature STAROTP_W TSKTMI_W2 Unit 1 Unit 1 Unit 2 Unit 3 Unit 1 Unit 2 Unit 3 Unit 1 Unit 2 Unit 3 Compressor rotation spe...

Page 57: ...door unit defrost request Transmitted only to unit to which auto fresh is applied indoor unit stopped last Compressor Accelerated by DFSTEP min 1 TDFSPT seconds and reaches defrost MAX speed DEFMAX Electric expansion valve 3 Failure occurred 12 minutes of defrost MAX time has elapsed 1 3 2 Shifted to auto fresh in defrost mode when operation is stopped Note 4 All indoor units must be stopped to fu...

Page 58: ...ansmitted only to unit to which auto fresh is applied indoor unit stopped last Compressor Accelerated by DFSTEP min 1 TDFSPT seconds and reaches defrost MAX speed DEFMAX Electric expansion valve 3 Failure occurred 12 minutes of defrost MAX time has elapsed 1 3 2 Shifted to auto fresh in defrost mode when operation is stopped Note 4 All indoor units must be stopped to fulfill condition for auto fre...

Page 59: ...0min 1 Always operation status of indoor units are monitored and forced cooling is inhibited when operation of any unit is detected Power Heating output Service switch Cooling output Outdoor fan Turns on for Cooling Operation Power Compressor rotation speed In rush Prevention Compressor Power relay Electric expansion valve Main microcomputer Reversing valve Unit 1 Unit 2 Unit 1 Unit 2 Hold Hold Ap...

Page 60: ...ted when operation of any unit is detected Power Heating output Service switch Cooling output Outdoor fan Turns on for Cooling Operation Power Compressor rotation speed In rush Prevention Compressor Power relay Electric expansion valve Main microcomputer Reversing valve Unit 1 Unit 2 Unit 3 Unit 1 Unit 2 Unit 3 Hold Hold Hold Approx 100ms 100ms 1sec 1sec 1sec 520 480 0 520 480 0 520 480 0 TSKTM1_C...

Page 61: ...r than the speed when the reduction started If NDOWN_OFF OH temperature NDOWN_ON and the OH temperature does not rise from that 20 seconds before the reduction of compressor speed will not occur Restriction Release Condition in common for all When two units are operated for heating Operation with one unit in heating or cooling mode and with two units in cooling mode is the same as in the above dia...

Page 62: ... the reduction started If NDOWN_OFF OH temperature NDOWN_ON and the OH temperature does not rise from that 20 seconds before the reduction of compressor speed will not occur Restriction Release Condition in common for all When three units are operated for heating Operation with one unit in heating or cooling mode and with two units in cooling mode is the same as in the above diagram WMAX2 and MINR...

Page 63: ...r Strainer Strainer Service valve 1 4 Service valve 3 8 Service valve 3 8 Single ended union 3 8 Single ended union 3 8 Single ended union 1 4 Indoor heat exchanger Air Flow Air Flow Indoor heat exchanger Single ended union 1 4 Charge port 1 2 Charge port 1 2 Service valve 1 4 Electric expansion 1 valve Electric expansion 2 valve Strainer Strainer Strainer Silencer Scroll Compressor REFRIGERATING ...

Page 64: ...2 Reversing valve Strainer Strainer Strainer Service valve 1 4 Service valve 3 8 Service valve 3 8 Single ended union 3 8 Single ended union 3 8 Single ended union 1 4 Indoor heat exchanger Air Flow Air Flow Indoor heat exchanger Single ended union 1 4 Charge port 1 2 Charge port 1 2 Service valve 1 4 Electric expansion 1 valve Electric expansion 2 valve Strainer Strainer Strainer Silencer Scroll ...

Page 65: ...ce valve 3 8 Service valve 3 8 Single ended union 3 8 Single ended union 3 8 Single ended union 3 8 Single ended union 1 4 Indoor heat exchanger Air Flow Air Flow Air Flow Indoor heat exchanger Indoor heat exchanger Single ended union 1 4 Charge port 1 2 Charge port 1 2 Charge port 1 2 Service valve 1 4 Service valve 1 4 Electric expansion 1 valve Electric expansion 2 valve Electric expansion 3 va...

Page 66: ... 4 Service valve 3 8 Service valve 3 8 Service valve 3 8 Single ended union 3 8 Single ended union 3 8 Single ended union 3 8 Single ended union 1 4 Indoor heat exchanger Air Flow Air Flow Air Flow Indoor heat exchanger Indoor heat exchanger Single ended union 1 4 Charge port 1 2 Charge port 1 2 Charge port 1 2 Service valve 1 4 Service valve 1 4 Electric expansion 1 valve Electric expansion 2 val...

Page 67: ...ISTOR 3 VARISTOR 2 SWITCHING POWER SUPPLY 1 SWITCHING POWER SUPPLY 2 C71 POWER P W B 1 2 TERMINAL BOARD BLK WHT GRN1 GRN2 GRN3 TB11 TB11 TB11 0V 0V N SPM2 C002 C001 C025 C024 DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAM 55QH4 RAM 65QH4 1 Power Circuit Fig 1 1 These rectify the 220 240V AC from terminals L and N to a DC power supply This circuit full wave rectifies 220 240 AC applied between ter...

Page 68: ... 78 P R P S OEEEEE LD304 LD303 LD302 LD301 SMOOTHING CAPACITOR SPM SYSTEM POWER MODULE DIODE STACK REACTOR SELF DIAGNOSIS LAMPS CONTROL P W B SERVICE SWITCH 2P TERMINAL BOARD SWITCHING POWER P W B ...

Page 69: ... 79 5A ...

Page 70: ...ve input SDI Micro computer 5V 5V 5V 12V 5V 5V IC8 R283 Q201 5V 5V 5V HIC 5V R813 R812 C802 Q803 C804 R811 R810 SDO1 SDI1 73 68 0V L801 L811 C801 R802 Q801 5V R801 R803 D209 0V 0V 0V 0V 0V 0V 0V C805 NF COIL C802 C216 R263 R262 R261 R260 D206 C214 Q206 R254 R255 R258 R257 R256 R259 C806 C804 Interface relay 35V Communications from indoor micro computer to outdoor micro computer Communications from...

Page 71: ...5V 0V 5V 35V 35V 35V DC line Base of outdoor P W B Q801 Q802 Outdoor micro computer 69 11 Pin 68 Pin Pin SDI Pin 35V DC line 100ms Leader 33ms 1 frame 5 7 5ms Transmit receive switching time 33ms 1 frame Fig 2 2 Voltages Waveforms of indoor Outdoor Micro computers Outdoor to Indoor Communications Fig 2 3 Voltages Waveforms of indoor Outdoor Micro computers Indoor to Outdoor Communications ...

Page 72: ...rs on the positive side are called the upper arm and the three transistors on the negative side the lower arm A U U V W V W W V U U coil V coil W coil DC compressor motor System Power Module FUSE 25A Terminal board N L R004 C006 Noise filter coil R002 R24 Coil lnrush current protection relay Power relay 0 35mH ACT MODULE INVERTER Fig 3 1 System power module circuit U is ON V is ON ...

Page 73: ...stor Lower arm transistor Time T U V W T U transistor chopped U transistor ON ON Voltage point Upper arm transistor Current at Chopping period 320 360V A B Fig 3 2 Switching order of power module Fig 3 3 Voltage waveform at each point ...

Page 74: ... coil DC compressor motor V coil W coil B Fig 3 4 System Power module circuit U is OFF V is ON P R P S OEEEEE LD304 LD303 LD302 LD301 SMOOTHING CAPACITOR SPM SYSTEM POWER MODULE DIODE STACK REACTOR SELF DIAGNOSIS LAMPS CONTROL P W B SERVICE SWITCH 2P TERMINAL BOARD SWITCHING POWER P W B Fig 3 5 ...

Page 75: ...r control circuits and DC35V indoor unit 1 Switching power supply 2 is generating the DC12V for expansion valve and DC35V for indoor unit 2 and 3 Switching power supply performs voltage conversion effectively by switching transistor IC1 to convert DC330V to high frequency of approximately 20kHz to 200kHz Transistor IC1 operates as follows Fig 4 1 Power circuit for P W B ...

Page 76: ... 86 ...

Page 77: ... 87 5 Reversing valve control circuit 3 1 16 1 V D831 OV IC8 Micro computer CN10 Reversing valve DC voltmeter or multimeter 35V 5V PQ831 R831 Q831 R832 R833 24 Fig 5 1 ...

Page 78: ...outdoor unit 5V 12V C607 IC3 C606 R601 R603 R604 C604 C603 C602 C601 R605 R606 R607 R611 R608 R609 R610 R501 R505 R504 R503 R502 R602 0V 0V 0V 0V C605 0V 4 5 6 7 3 11 12 8 9 1 2 13 14 10 V W U DC brushless motor for compressor lnverter Fig 6 1 Rotor magnetic pole position detection circuit ...

Page 79: ...ration R24 R245 Detection resistor DC current SPM terminal 0V 0V 12V 0V 5V 5V D205 R222 R221 C283 R247 R338 R110 R108 C105 C103 CT1 C282 Is D104 R249 0V 0V 0V 0V 0V 0V IC4 0V 0V SPM terminal R248 C281 Reset IP cutter Id AX 6S00 Outdoor Microcomputer 0V C224 5V Q209 Q205 C223 R293 R292 R294 ZD201 R295 R290 R291 Is 6 8 4 5 7 48 9 60 61 Fig 7 1 Peripheral circuit of microcomputer AX 6S00 ...

Page 80: ... terminal Primary CT 0V 0V Voltage amp circuit Judgement OVL with respect to externally set value Judgement OVL according to the rotation speed A D convarter OVL start current data Selects data according to the rotation speed and DC voltage RC filter circuit Internal judgement DC voltage DC current Rotation speed Motor control process A D convarter A D convarter AX 6S00 micro computer Fig 8 1 Over...

Page 81: ...R291 R290 Q209 Q205 C223 C224 To trip signal composing circuit Microcomputer AX 6S00 R295 48 12V line 12V line 5V line 5V line Reset voltage Reset voltage 12 6 0 12 6 0 Voltage when power is turned OFF Voltage when power is turned ON Time Time Fig 9 1 Fig 9 2 ...

Page 82: ...and electric expansion valve thermistor so that they detect the temperatures of the unit and control the system The circuit of the thermistors is shown as Fig 10 1 for model RAM 55QH4 Fig 10 2 for model RAM 65QH4 and their roles and temperature measuring points are shown as Table 10 1 Fig 10 1 Temperature Detection Circuit Fig 10 2 Temperature Detection Circuit ...

Page 83: ...mperatures are used to decide how much the expansion valve is opened Outdoor temperature is used to decide the various operations of the air conditioner CN5 DEF thermistor Heat exchanger CN6 Outdoor temperature thermistor Outside temperature CN7 Electric expansion valve thermistor NARROW PIPE 1 Indoor unit 1 NARROW PIPE Electric expansion valve thermistor NARROW PIPE 2 Indoor unit 2 NARROW PIPE El...

Page 84: ...the unit operates abnormally after replacing the thermistor replace the control P W B because it malfunctions The OH thermistors are detecting the compressor head temperatures If the temperature rises over 118 C the compressor in the cycle will be stopped to protect itself and LD301 will blink 6 times OH STOP When the compressor temperature fells under 105 C the compressor will restart During OH S...

Page 85: ... voltage that has not changed from around 0 9V or 12V expansion valve or microcomputer is defective Fig 11 2 shows logic waveform when expansion valve is operating 11 Electric expansion valve Pin Drive status Lear wire 1 ON OFF OFF OFF Pin No 12V 0 9V 200ms 75ms 50ms 42 38 41 37 40 36 39 35 ON ON OFF OFF ON OFF OFF ON OFF ON OFF OFF OFF ON ON OFF OFF OFF ON OFF OFF OFF ON ON OFF OFF OFF ON 2 3 4 5...

Page 86: ...ll be similar to waveform of input voltage I input current V input voltage input voltage input current Effective voltage area Effective voltage area Invalid power area Even if voltage is applied current does not flow Assuming the same current capacity 20A power can be used about 10 effective comparing with curent use power factor of 90 and maximum capacity is thereby improved ...

Page 87: ...d the microcomputer power source is unconnected Inspection method 1 Abnormally stop is shown by the number of times the LED blinks Inspection method 2 Thermistor abnormally is shown by the number of times the LED blinks Inspection method 3 In the case that an internal unit is Communications error is shown by the number of times the LED blinks not connected the number of connected internal units is...

Page 88: ...cting external electrical parts and check the cause of the problem Connect a commercial use 220 240V power source to the L N terminal Replace the broken part and the 25A fuse The control power source is broken Replace the control P W B Is varistor 2 broken There is the possibility that an irregular voltage has been flowing to the L N terminal Check to see that the power source is not abnormality R...

Page 89: ...efore stopping There is the chance that the cycle load has become heavy and the compressor has come loose Check the compressor In this case the LED may blink twice before stopping Yes Yes Yes abnormally Takes several minutes to restart Restarts quickly every time Restarts quickly every time No abnormally The SPM2 may be broken Replace the SPM2 The SPM2 may be broken Replace the SPM2 Cable abnormal...

Page 90: ...s fourteen times ACT error Yes No LD301 Blinks thirteen times E2 PROM error The protection circuit may cause the fan to stop when the wind is extremely strong in the place where the outdoor unit is installed or when the outdoor unit is covered Refil the coolant Check the compressor NO CHANGE still same Replace MAIN P W B NO CHANGE still same Check the compressor Replace POWER P W B Replace the ele...

Page 91: ...s check the voltage between the SPM P1 terminal and the N terminal Turn off the power source and ten minutes later remove the SPM CN13 cords Then check the DC voltage between the 1 pin of the SPM CN13 and the N terminal within three minutes of the power relay being turned on Block off the power source and return the yellow striped and blu striped wires to their former position Then remove the gray...

Page 92: ... 105 ...

Page 93: ... 106 ...

Page 94: ...o this with the compressor connector in a removed state LD301 will blink four times and the unit will not work HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY Be sure to return the service switch to normal after checking with service operation is completed 1 Connect the large dia pipe side and small dia pipe side service valves using a pipe Connect the small diameter service value and the large diam...

Page 95: ...ote that it takes about 10 minutes until the voltage fall after the power switch is turned off Across a b 0V line Across a ground Across b 0V line ground approx 360V approx 155 170V approx 155 170V When using an oscilloscope never ground it Don t forget that high voltages as noted above may apply to the oscilloscope DANGER DANGER Power source 1 ø 220 240V 50Hz ...

Page 96: ...f each circuit of electrical parts in outdoor unit is performed to prevent secondary trouble disconnect red gray wire connected to system power module SPM from diode stack Also be sure to perform discharging of smoothing capacitor Do not use soldering iron with transformer Doing so will blow thermal fuse inside transformer As shown left apply soldering iron to metal parts receptacles in sleeve cor...

Page 97: ...2 LD301 Lighting mode self diagnosis lamp Location of self diagnosis lamp 1 RAM 55 65QH4 SMOOTHING CAPACITOR SPM SYSTEM POWER MODULE DIODE STACK REACTOR SELF DIAGNOSIS LAMPS CONTROL P W B SERVICE SWITCH 2P TERMINAL BOARD SWITCHING POWER P W B ...

Page 98: ... 111 Lighting mode self diagnosis lamp 2 RAM 55 65QH4 SERVICE SWITCH MAIN P W B Remark Starmark is only use for RAM 65QH4 ...

Page 99: ... 112 TROUBLESHOOTING OF THE SYSTEM POWER MODULE ...

Page 100: ... 113 ...

Page 101: ... 114 ...

Page 102: ... R P S OEEEEE LD304 LD303 LD302 LD301 SMOOTHING CAPACITOR SPM SYSTEM POWER MODULE DIODE STACK REACTOR SELF DIAGNOSIS LAMPS CONTROL P W B SERVICE SWITCH 2P TERMINAL BOARD SWITCHING POWER P W B MODEL RAM 65QH4 ...

Page 103: ... 116 three three inlet 3 Cut off the three pipes at the side and bottom of Reversing valve ...

Page 104: ... 117 ELECTRIC EXPANSION VALVE PIPE THERMISTOR POSITION CHARTS MODEL RAM 55QH4 MODEL RAM 65QH4 ...

Page 105: ... 118 PARTS LIST AND DIAGRAM MODEL RAM 55QH4 5 25 23 18 14 6 16 12 29 29 13 24 43 7 8 3 32 33 11 43 17 34 37 38 20 21 27 19 1 22 26 39 35 36 44 45 46 10 42 4 2 31 40 41 ...

Page 106: ... 1 FAN MOTOR 22 PMRAC 40CNH2 904 1 CABINET 23 PMRAC 24CP5 904 1 NET 24 PMRAC 40CNH2 922 1 TOP COVER 25 PMRAM 55QH4 903 1 SIDE PLATE R 26 PMRAC 40CNH2 926 1 SIDE PLATE L 27 PMRAC 51CHA1 907 1 D GRILL AS INCL MOUTH RING 29 PMRAM 65QH4 903 2 ELECTRICAL EXPANSION VALVE 31 PMRAM 65QH4 918 1 STRAINER ST PIPE AS 2 32 PMRAM 65QH4 919 1 STRAINER ST PIPE AS 3 33 PMRAM 65QH4 920 1 STRAINER CO PIPE AS 34 PMRA...

Page 107: ... 120 PARTS LIST AND DIAGRAM MODEL RAM 65QH4 5 25 23 18 14 6 16 12 34 29 29 13 17 36 35 39 37 38 20 21 44 45 46 34 24 43 7 8 9 3 32 33 11 43 10 42 29 30 31 40 41 4 2 26 22 19 27 1 ...

Page 108: ...8 1 SUPPORT FAN MOTOR 21 PMRAC 40CNH2 919 1 FAN MOTOR 22 PMRAC 40CNH2 904 1 CABINET 23 PMRAC 24CP5 904 1 NET 24 PMRAC 40CNH2 922 1 TOP COVER 25 PMRAM 65QH4 911 1 SIDE PLATE R 26 PMRAC 40CNH2 926 1 SIDE PLATE L 27 PMRAC 51CHA1 907 1 D GRILL AS INCL MOUTH RING 29 PMRAM 65QH4 903 3 ELECTRICAL EXPANSION VALVE 30 PMRAM 65QH4 917 1 STRAINER ST PIPE AS 1 31 PMRAM 65QH4 918 1 STRAINER ST PIPE AS 2 32 PMRA...

Page 109: ...HITACHI PM NO 0217E Printed in Malaysia RAM 55QH4 RAM 65QH4 ...

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