Hitachi RAM-52QH5 Service Manual Download Page 65

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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-52QH5

Page 1: ...MAIN CIRCUIT OPERATION 75 TROUBLE SHOOTING 106 DISASSEMBLY AND REASSEMBLY 113 PARTS LIST AND DIAGRAM 116 RAM 52QH5 RAM 53QH5 After installation NOTE This manual describes only points that differ from RAF 25 35 50NH5 RAD 25 35NH5 RAD 25 35NH5 and RAM 80QH5 TC No 0771EF RAI 25 35NH5 PM No 0271E RAI 50NH5 and RAC 50NH5 PM No 0274E RAK 18 25 35NH5 PM No 0269E RAK 50NH5 and RAC 50NH5 PM No 0302E for it...

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 Staple...

Page 5: ... 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 14 F 6 Thi...

Page 6: ...STOR 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 52QH5 JU1013DA MAX 45m RAM 53QH5 In case the pipe length is more than 35m add refrigerant R410 at 20gram per every meter exceeds RAM 53QH5 RAM 52QH5 ...

Page 7: ...EER B T U hW TOTAL AMPERES A POWER FACTOR MAXIMUM LENGTH OF PIPING STANDARD RAM 52QH5 1ø 220 240V 50Hz 16 5 20 17 740 1 500 11 79 6 9 6 3 99 6 80 23 200 1 790 12 68 8 2 7 5 99 MAX 35m TWO UNIT TOTAL CE EMC LVD RAM 52QH5 MODEL W PACKING mm H D cu ft 1 008 698 394 9 79 55 GROSS WEIGHT kg 6 35D 9 52DX2 FLARENUTSIZE SMALL LARGE INDOOR SUCTION TEMPERATURE C COOLING OPERATION SCOPE OUTDOOR SUCTION TEMPE...

Page 8: ...OTAL AMPERES A POWER FACTOR MAXIMUM LENGTH OF PIPING STANDARD RAM 53QH5 1ø 220 240V 50Hz 16 5 20 17 740 1 525 11 63 7 0 6 4 99 6 80 23 200 1 687 13 75 7 7 7 1 99 MAX 45m THREE UNIT TOTAL CE EMC LVD RAM 53QH5 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 OPERATION SCOPE INDOOR SUCTION TEMPERATURE C COOLING OPERATION SCOPE OUTDOOR SUCTION T...

Page 9: ...ted OUTDOOR UNIT COOLING AMPERE A 220 240V CAPACITY RATING kW RANGE POWER CONSUMPTION W OUTDOOR UNIT HEATING Reference value 1 8 2 5 3 5 5 0 1 8 1 8 1 8 2 5 1 8 3 5 1 8 5 0 2 5 2 5 2 5 3 5 3 5 3 5 2 5 5 0 3 5 5 0 1 80 2 50 3 50 5 00 1 80 1 80 1 76 2 44 1 70 3 30 1 38 3 82 2 50 2 50 2 17 3 03 2 60 2 60 1 73 3 47 2 14 3 06 495 700 1030 1510 1015 1167 1472 1540 1472 1525 1500 1500 1500 2 3 2 1 3 2 2 ...

Page 10: ... Whichever indoor units are installed cooling and heating capacity depends on how many and which indoor units are operating at that time RATING CONDITON DRY BLUB WET BULB COOLING HEATING INDOOR OUTDOOR 27 19 C 20 C 35 24 C 7 6 C Reference value ONE UNIT INDICATED ARE ONLY FOR ONE UNIT OPERATION WHEN TWO INDOOR UNITS ARE CONNECTED ...

Page 11: ... 80 1 00 2 50 1 00 2 50 1 00 2 50 1 00 2 50 1 00 2 50 1 00 2 50 1 00 2 50 1 00 2 50 1 00 2 50 1 00 2 50 1 00 2 50 1 00 3 50 1 00 3 50 1 00 3 50 1 00 3 50 1 00 3 50 1 00 3 50 1 00 3 50 1 00 3 50 1 00 3 50 1 00 3 50 1 00 3 50 1 00 5 00 1 00 5 00 1 00 5 00 1 00 5 00 1 00 5 00 1 00 5 00 1 00 5 00 1 00 5 00 1 00 5 00 1 00 5 00 1 00 1 80 1 00 1 80 1 00 1 80 1 00 1 80 1 00 2 50 1 00 2 50 1 00 2 50 1 00 2...

Page 12: ... 15 12 15 11 14 14 18 1 8 1 8 1 8 1 8 2 5 2 5 1 8 2 5 3 5 5 0 2 5 3 5 2 5 3 5 4 0 5 0 means indoor units cooling capacity class 1 Marking needs flare adapter 9 52 12 7D Part No TA261D 4 001 2 Suitable 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 ...

Page 13: ...15 11 14 14 18 1 8 1 8 1 8 1 8 2 5 2 5 1 8 2 5 3 5 5 0 2 5 3 5 3 5 3 5 13 16 13 16 3 5 3 5 2 5 5 0 10 12 18 20 2 5 5 0 2 5 3 5 4 0 5 0 means indoor units cooling capacity class 1 Marking needs flare adapter 9 52 12 7D Part No TA261D 4 001 2 Suitable 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 fo...

Page 14: ...E LENGTH 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 7 5kW Make sure to connect to two indoor units ...

Page 15: ...ON PIPE 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 7 5kW Make sure to connect to two or three indoor units ...

Page 16: ... 15 MODEL RAM 52QH5 ...

Page 17: ... 16 MODEL RAM 53QH5 ...

Page 18: ...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 19: ...Indoor unit 1 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 c...

Page 20: ...e them fit between 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 Len...

Page 21: ... 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 22: ...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 23: ...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 52QH5 RAM 53QH5 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 24: ...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 52QH5 RAM 53QH5 JU1013DA SINGLE DC 280 330V 50Hz 4 U V W M M M WHITE YELLOW RED WHITE RED YELLOW ...

Page 25: ... 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 52QH5 ...

Page 26: ...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 52QH5 ...

Page 27: ...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 53QH5 ...

Page 28: ...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 53QH5 ...

Page 29: ...LATED TO THE PIPING LENGTH MODEL RAM 52QH5 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 30: ... 29 CAPACITY DIAGRAM RELATED TO THE PIPING LENGTH MODEL RAM 53QH5 ...

Page 31: ...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 52QH5 RAM 53QH5 Heating ...

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 52QH5 RAM 53QH5 Cooling ...

Page 33: ...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 34: ...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 35: ...SEG1 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 2SC2...

Page 36: ...CIRCUIT DIAGRAM MODEL RAM 52QH5 39 L C023 C022 C002 C001 C025 C024 N ...

Page 37: ...CIRCUIT DIAGRAM MODEL RAM 53QH5 41 L C023 C022 C002 C001 C025 C024 N ...

Page 38: ...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 39: ...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 40: ... 45 ...

Page 41: ...125 TSKTM1_W1 60 sec 126 SDRCT1_W2 3000 min 1 127 TSKTM1_W2 60 sec 128 SDSTEP 1000 min 1 129 TSKSPT 8 sec 12A KYO_RPM 3000 min 1 198 TDF414 90 sec 199 DFMXTM 12 min 1 19A SDRCT2 2000 min 1 19B TSKTM2 60 sec 19C DFSTEP 600 min 1 19D TDFSPT 60 sec 19E DEFMAX 6000 min 1 19F TDF415 120 sec 1A0 DFSTMB 55 min 1A1 DFSTMB2 60 min 1A2 DEFONH 1 9 C 1A3 DEFON 5 1 C 1A4 DEFONL 23 9 C 1A5 DEF_a1 112 128 1A6 DE...

Page 42: ... 49 Outdoortemperature STAROTP_C TSKTM1_C1 Outdoortemperature STAROTP_C TSKTM1_C2 ...

Page 43: ... 51 ...

Page 44: ... 53 ...

Page 45: ... 55 ...

Page 46: ... 57 ...

Page 47: ...l N correction distribution control MODEL RAM 52QH5 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 48: ... N correction distribution control TD control N correction distribution control MODEL RAM 53QH5 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 49: ...g operated 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 TDF41...

Page 50: ...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 51: ...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 52: ...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 53: ...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 54: ...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 55: ...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 56: ...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 57: ... 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 58: ... 69 REFRIGERATING CYCLE DIAGRAM RAM 52QH5 ...

Page 59: ... 70 REFRIGERATING CYCLE DIAGRAM RAM 52QH5 ...

Page 60: ... 71 REFRIGERATING CYCLE DIAGRAM RAM 53QH5 ...

Page 61: ... 72 REFRIGERATING CYCLE DIAGRAM RAM 53QH5 ...

Page 62: ...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 52QH5 RAM 53QH5 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 63: ... 74 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 64: ... 75 5A ...

Page 65: ...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 66: ...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 67: ... 78 3 System power Module Circuit ...

Page 68: ...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 69: ... 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 70: ...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 71: ... 82 ...

Page 72: ... 83 5 Reversing valve control circuit Fig 5 1 ...

Page 73: ...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 74: ...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 6V01 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 6V01 ...

Page 75: ... 86 8 Overload control circuit OVL control circuit Fig 8 1 Overload Control System Configuration Fig 8 2 ...

Page 76: ...R291 R290 Q209 Q205 C223 C224 To trip signal composing circuit Microcomputer AX 6V01 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 77: ...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 55QH5 Fig 10 2 for model RAM 65QH5 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 78: ...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 79: ...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 80: ... 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 81: ...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 82: ...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 83: ...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 84: ...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 85: ...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 86: ... 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 87: ... 101 ...

Page 88: ... 102 ...

Page 89: ...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 90: ...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 91: ...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 92: ...D301 Lighting mode self diagnosis lamp Location of self diagnosis lamp 1 RAM 52QH5 RAM 53QH5 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 93: ... 107 Lighting mode self diagnosis lamp 2 RAM 52QH5 RAM 53QH5 SERVICE SWITCH MAIN P W B Remark Starmark is only use for RAM 53QH5 ...

Page 94: ... 108 TROUBLESHOOTING OF THE SYSTEM POWER MODULE ...

Page 95: ... 109 ...

Page 96: ... 110 ...

Page 97: ...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 52QH5 RAM 53QH5 ...

Page 98: ... 112 three three inlet 3 Cut off the three pipes at the side and bottom of Reversing valve ...

Page 99: ... 113 ELECTRIC EXPANSION VALVE PIPE THERMISTOR POSITION CHARTS MODEL RAM 53QH5 MODEL RAM 52QH5 ...

Page 100: ... 114 PARTS LIST AND DIAGRAM MODEL RAM 52QH5 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 22 26 39 35 36 45 46 10 42 4 2 31 40 41 ...

Page 101: ...H2 S19 1 FAN MOTOR 40W 22 PMRAM 52QH5 S02 1 CABINET 23 PMRAC 24CP5 904 1 NET 24 PMRAC 40CNH2 922 1 TOP COVER 25 PMRAM 55QH4 S03 1 SIDE PLATE R 26 PMRAC 40CNH2 926 1 SIDE PLATE L 27 PMRAM 52QH5 S03 1 D GRILL AS 29 PMRAM 65QH4 S03 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 PMRAC 07CV1 ...

Page 102: ... 116 PARTS LIST AND DIAGRAM MODEL RAM 53QH5 5 25 23 18 14 6 16 12 34 29 29 13 17 36 35 39 37 38 20 21 45 46 34 24 43 7 8 9 3 32 33 11 43 10 42 29 30 31 40 41 4 2 26 19 27 22 ...

Page 103: ...40CNH2 S19 1 FAN MOTOR 22 PMRAM 52QH5 S02 1 CABINET 23 PMRAC 24CP5 904 1 NET 24 PMRAC 40CNH2 922 1 TOP COVER 25 PMRAM 65QH4 S11 1 SIDE PLATE R 26 PMRAC 40CNH2 926 1 SIDE PLATE L 27 PMRAM 52QH5 903 1 D GRILL AS 29 PMRAM 65QH4 S03 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 PMRAM 65QH4 919 1 STRAINER ST PIPE AS 3 33 PMRAM 65QH...

Page 104: ...HITACHI PM NO 0428E Printed in Malaysia RAM 52QH5 RAM 53QH5 ...

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Hitachi RAM-52QH5, Service Manual, Page: 65 / 104

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