Hitachi RAM-90QH5 Service Manual Download Page 46

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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)

Indoor 1

IF receive
input (SDI)

Micro
computer

12V

HIC

R813

R812

C802

Q803

C804

R811

R810

L801

L811

C805

NF COIL

C803

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 1

+5V

R255

R258

R813

C818

R259

R260

R261

R262

R81

R854

R804

R256

R347

R346

C213

C214

C216

R254

C812

C811

R257

R812

R263

Q802

Q202

D211

D206

IC6

Q206

C316

INH

IC15

Summary of Contents for RAM-90QH5

Page 1: ...M 25 BLOCK DIAGRAM 29 BASIC MODE 31 REFRIGERATING CYCLE DIAGRAM 51 DESCRIPTION OF MAIN CIRCUIT OPERATION 52 TROUBLE SHOOTING 88 PARTS LIST AND DIAGRAM 94 After installation W A COOLING CAPACITY DC INVERTER FIVE SYSTEM MULTI TYPE MODEL POWER SOURCE TOTAL INPUT TOTAL AMPERES SPECIFICATIONS RAM 90QH5 HEATING CAPACITY DIMENSIONS mm NET WEIGHT 1ø 220 240V 50 60Hz W H D kg kW B T U REFER TO THE SPECIFIC...

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: ...sion 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 1...

Page 6: ... SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL 138 W NO NO NO YES YES 5 0A G4A NO NO YES NO 450NR YES YES IC NO 2700g WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNIT PIPES REFRIGERANT CHARGING VOLUME Refrigerant 410A RAM 90QH5 JU1318D1 MAX 75m In case the pipe length is more than 30m add refrigerant R410 at 15gram per every mete...

Page 7: ...AXIMUM LENGTH OF PIPING STANDARD RAM 90QH5 1ø 220 240V 50 60Hz 30 9 00 3 20 9 90 30 720 10 920 33 780 2 360 600 3 040 13 02 10 8 9 9 99 11 00 3 40 12 10 37 540 11 610 41 290 2 460 610 2 910 15 26 11 3 10 4 99 MAX 75m FIVE UNIT TOTAL CE EMC LVD RAM 90QH5 MODEL W PACKING mm H D cu ft 1 073 867 510 16 61 78 GROSS WEIGHT kg 6 35DX5 9 52DX3 12 70X2 FLARENUTSIZE SMALL LARGE INDOOR SUCTION TEMPERATURE C ...

Page 8: ...heating capacity depends on how many and which indoor units are operating at that time 12 6 2740 3 28 3 32 3 28 3 54 3 32 3 24 3 24 3 27 3 25 2710 2740 2120 2560 2780 2780 2750 2770 11 5 12 4 11 4 12 6 11 5 9 7 8 9 11 8 10 8 12 8 11 7 12 8 11 7 12 6 11 6 12 7 11 7 Reference value 5 ROOM MULTI SPLIT INVERTER TYPE ROOM AIR CONDITIONER POSSIBLE COMBINATION TO OPERATE SAME TIME OPERATION ...

Page 9: ...2 74 2 74 REMARKS ONE UNIT INDICATED ARE ONLY FOR ONE UNIT OPERATION WHEN TWO OR MORE INDOOR UNITS ARE CONNECTED TWO UNITS INDICATED ARE ONLY FOR TWO UNITS OPERATION WHEN TWO OR MORE INDOOR UNITS ARE CONNECTED THREE UNITS INDICATED ARE ONLY FOR THREE UNITS OPERATION WHEN THREE OR MORE INDOOR UNITS ARE CONNECTED FOUR UNITS INDICATED ARE ONLY FOR FOUR UNITS OPERATION WHEN FOUR OR FIVE INDOOR UNITS A...

Page 10: ...TING RAK 18NH5 RAK 18NH6 1 8 1 00 2 50 1 10 3 20 8 12 9 11 RAK 25NH5 RAK 25NH6 2 5 1 00 2 80 1 10 4 70 11 17 14 18 RAF 25NH5 2 5 1 00 2 80 1 10 4 70 11 17 14 18 RAD 25NH5 RAD 25NH7 2 5 1 00 2 80 1 10 4 70 11 17 14 18 RAI 25NH5 2 5 1 00 2 80 1 10 4 70 11 17 14 18 RAK 35NH5 RAK 35NH6 3 5 1 00 3 90 1 10 5 80 16 24 17 22 RAF 35NH5 3 5 1 00 3 90 1 10 5 80 16 24 17 22 RAD 35NH5 RAD 35NH7 3 5 1 00 3 90 1...

Page 11: ...8 1 8 1 8 2 5 1 8 1 8 1 8 3 5 8 12 8 12 8 12 16 24 1 8 1 8 1 8 3 5 1 8 1 8 1 8 5 0 7 11 7 11 7 11 20 30 1 8 1 8 1 8 5 0 1 8 1 8 1 8 6 0 6 10 6 10 6 10 22 33 1 8 1 8 1 8 6 0 1 8 1 8 2 5 2 5 8 12 8 12 11 17 11 17 1 8 1 8 2 5 2 5 1 8 1 8 2 5 3 5 8 12 8 12 11 16 15 23 1 8 1 8 2 5 3 5 1 8 1 8 2 5 5 0 7 10 7 10 9 14 19 28 1 8 1 8 2 5 5 0 1 8 1 8 2 5 6 0 6 9 6 9 8 13 20 31 1 8 1 8 2 5 6 0 1 8 1 8 3 5 3 5...

Page 12: ...3 5 5 0 1 8 1 8 1 8 3 5 6 0 5 8 5 8 5 8 10 15 16 25 1 8 1 8 1 8 3 5 6 0 1 8 1 8 1 8 5 0 5 0 5 7 5 7 5 7 13 20 13 20 1 8 1 8 1 8 5 0 5 0 1 8 1 8 2 5 2 5 2 5 7 10 7 10 9 14 9 14 9 14 1 8 1 8 2 5 2 5 2 5 1 8 1 8 2 5 2 5 3 5 6 9 6 9 8 13 8 13 12 18 1 8 1 8 2 5 2 5 3 5 1 8 1 8 2 5 2 5 5 0 5 8 5 8 8 11 8 11 15 23 1 8 1 8 2 5 2 5 5 0 1 8 1 8 2 5 2 5 6 0 5 8 5 8 7 11 7 11 17 26 1 8 1 8 2 5 2 5 6 0 1 8 1 8...

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Page 16: ...sing the vacuum suction pump Refer to Power Supply Terminal Connections in regards to the LN terminal CAUTION Ingress of air during the operating cycle may cause increase in pressure and other breakdowns Switch off the outdoor unit s power supply Shut the manifold valve handle Hi handle Lo need to be open and operate the vacuum pump for approximately 60 minutes Upon a full shut of manifold valve h...

Page 17: ...ht difference between each indoor unit 5m To the outdoor unit up to five indoor units can be connected until the total value of capacity to 15 5kW Make sure to connect two or more indoor units L2 L1 L3 Indoor unit 3 L4 Indoor unit 4 L5 Indoor unit 5 Indoor unit 2 Indoor unit 1 Outdoor unit Indoor unit 2 Indoor unit 3 Indoor unit 4 Indoor unit 5 Indoor unit 1 5m ...

Page 18: ...l flare adaptor for piping is necessary One unit of 1 8kW 2 5kW 3 5kW 5 0kW 6 0kW or 7 1kW 1 8 3 5kW unit Optional flare adaptor for piping is necessary One unit of 1 8kW 2 5kW 3 5kW 5 0kW 6 0kW or 7 1kW 1 8 3 5kW unit Optional flare adaptor for piping is necessary Face this side suction side of the unit to the wall Remove side cover when connecting the piping and connecting cord Pull downward 13 ...

Page 19: ... 18 BASE DRAIN PIPE A DRAIN PIPE BUSH 100 mm ABOVE 10 11 ...

Page 20: ...for ground earth screw Screw for ground earth screw Terminal board Terminal board Terminal board Terminal board Terminal board Terminal board Terminal board Terminal board Terminal board Terminal board Terminal board Terminal board Terminal board Terminal board Terminal board Power cord C D D1 C1 C D D2 C2 C D C3 D3 C D C4 D4 A B B4 A4 C D C5 D5 A B A5 B5 L N Screw for ground earth screw Screw for...

Page 21: ... 20 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAM 90QH5 Service space ...

Page 22: ...MODEL RAM 90QH5 WIRING DIAGRAM 21 POWER SOURCE AC220 240V 50 60Hz TERMINAL BOARD INDOOR 5 INDOOR 5 INDOOR 4 INDOOR 2 BLU RED GRY WHT BLK INDOOR 4 INDOOR 3 Io P P W B CAPA P W B IPM BOARD TAB 01 TAB 02 ...

Page 23: ...RESSOR MODEL PHASE SINGLE RATED VOLTAGE AC 220 240 V RATED FREQUENCY 50 60 Hz POLE NUMBER 4 CONNECTION 20 C 68 F 75 C 167 F RESISTANCE VALUE 0 410 0 397 0 390 RAM 90QH5 JU1318D1 WHITE U W V RED YELLOW 0 499 0 483 0 474 RED S YELLOW R WHITE C U V V W W U U V V W W U ...

Page 24: ...ION MODEL 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 90QH5 DC 280V 138W RESISTANCE VALUE 20 C 68 F 75 C 167 F M RED BLK WHT YEL BLU Control circuit built in 280V 15V 0V 0 6V 0 15V ...

Page 25: ...EG2 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 K9 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 ...

Page 26: ...CIRCUIT DIAGRAM MODEL RAM 90QH5 27 ...

Page 27: ...face 4 Clock circuit Multiplexer Expansion valve thermistor 3 Expansion valve thermistor 1 Expansion valve thermistor 2 Expansion valve thermistor 4 Expansion valve 1 Expansion valve 2 Expansion valve 3 Expansion valve drive circuit Expansion valve 4 Expansion valve 5 Reversing valve drive circuit Reversing valve EEPROM Fan motor drive circuit M compressor fan motor Indoor unit 1 Indoor unit 2 Ind...

Page 28: ... 31 ...

Page 29: ...DFCTPS_d 100 125 DFCTPN_d 240 126 DFSPPS_d 44 127 DFPSMX_d 480 12B PCLOSH_d 86 238 STAROTP_C 25 0 C 239 SDRCT1_C1 2500 min 1 23A TSKTM1_C1 60 sec 2B SDRCT1_C2 2500 min 1 23C TSKTM1_C2 60 sec 23D STAROTP_W 4 8 C 23E SDRCT1_W1 2500 min 1 23F TSKTM1_W1 60 sec 240 SDRCT1_W2 2500 min 1 241 TSKTM1_W2 60 sec 242 SDSTEP 500 min 1 243 TSKSPT 30 sec 24E CMAX1 5300 min 1 24F CMAX2 5400 min 1 251 CMAX3 5500 m...

Page 30: ... the above 1 the compressor does not go through the steady speed period but it starts fuzzy control 3 The thermo OFF temperature during cool dash is cooling set temperature including cooling shift 3 C After thermo OFF cool dash is finished and fuzzy control starts 4 The compressor minimum ON time and minimum OFF time is 3 minutes 5 The time limit for which the maximum compressor speed CMAX1 or CMA...

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Page 35: ...itialized 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 The valve for unit 3 is fully closed 520 pulses and then that for unit 4 is fully opened 480 pulses The valve for unit 4 is fully closed 520 pulses and then that for u...

Page 36: ... 45 90 23 ...

Page 37: ...sec 15 sec Defrosting inhibit period Balancing period TDF414 Reverse cycle period max DFMXTM Balancing period TDF415 Start sequence TSKTM1_W SDRCT1_W T_DFCTPS PSTARTH2 PSTARTH2 DFCTPS DFCTPS PCLOSH PCLOSH DFPSMX DFPSMX DFCTPS Hold DFCTPS Hold Hold 0 Palse 0 Palse Hold DFSPPS Pulse TDFSPT sec DFSPPS Pulse TDFSPT sec Defrosting sequence TSKTM2 DEFMAX SDRCT2 DFSTEP min 1 TDFSPT sec 30 sec 480 0 Unit ...

Page 38: ...equest Balancing request Balancing request Balancing period 3 min Target speed 1 room operation 2 rooms operation Auto fresh inhibit period 15min Balancing period TDF414 Target speed Reversing cycle period max DFMXTM Defrosting sequence DEFMAX SDRCT2 DFCTPS TSKTM2 Hold 480 Unit 1 Unit 2 Expansion valve Unit 3 Unit 4 Unit 5 0 480 0 480 480 0 480 0 Hold Hold Hold 0 Pulse 0 Pulse 0 Pulse Hold Hold DF...

Page 39: ...ling is inhibited when operation of any unit is detected MODEL RAM 90QH5 Power Service switch Request to Indoor Power relay Reversing valve Unit 1 Forced cooling request Forced cooling request Forced cooling request Forced cooling request Balancing request Balancing request Balancing request Balancing request Forced cooling request Balancing request Unit 2 Unit 3 Unit 5 Unit 4 Power Outdoor fan Co...

Page 40: ...oor fan Compressor rotation speed 0 Pulse 0 Pulse 0 Pulse 20 sec 20 sec 480 Unit 1 Unit 2 Expansion valve Unit 3 Unit 4 0 480 0 480 0 480 0 0 Pulse Unit 5 480 0 NDWN_ON NDWN_OFF 20 sec 20 sec 30 sec Decreases by 100 min 1 30 sec Increases by 50 min 1 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec When one unit is operated for cooling ...

Page 41: ...eating Outdoor fan Compressor rotation speed 20 sec 20 sec 480 Unit 1 Unit 2 Expansion valve Unit 3 Unit 4 0 0 480 0 480 0 480 NDWN_ON NDWN_OFF 20 sec 20 sec 30 sec Decreases by 100 min 1 30 sec Increases by 50 min 1 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec Unit 5 480 0 When one unit is operated for heating ...

Page 42: ... 51 REFRIGERATING CYCLE DIAGRAM MODEL RAM 90QH5 ...

Page 43: ...ctify the 220 240V AC from terminals L and N to a DC power supply Reference In case of IPM malfunction or defective connection Immediately after the compressor starts it may stop due to abnormally low speed IP error etc In case of active module faulty or defective connection Although the compressor continues to operate normally the power factor will decrease the operation current will increase and...

Page 44: ...1 4 Be careful to avoid an electric shock as a high voltage is generated Also take care not to cause a short circuit through incorrect connection of test equipment terminals The circuit board could be damaged 5 Smoothing capacitor C020 270µF DC 450V This smoothes averages the voltage rectified by the diode stacks A DC voltage is generated in the same way as in Fig 1 3 Voltage between C020 side and...

Page 45: ... and outputs it to the microcomputer Communications are performed by mutually transmiting and receiving the 4 frame outdoor request signal one frame of which consists of a leader of approx 100 ms start bit 8 bit data and stop bit and the command signal with the same format transmit from the indoor unit From outdoor microcomputer to indoor microcomputer The request signal output from microcomputer ...

Page 46: ...Q803 C804 R811 R810 0V L801 L811 C805 NF COIL C803 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 1 10 11 5V 5V 5V 5V 5V 5V 5V 5V 5V R255 R258 R813 C818 R259 R260 R261 R262 R811 R854 R804 R256 R347 R346 C213 C214 C216 R254 C812 C811 R257 R812 R2...

Page 47: ...3 C804 R811 R810 0V L802 L812 C815 NF COIL C813 C814 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 2 10 11 I F 0V 5V 5V 5V 5V 5V 5V 5V 5V 5V R265 R268 R823 C828 R269 R270 R271 R272 R821 R844 R805 R266 R347 R346 C217 C218 C219 R264 C822 C821 R267 R82...

Page 48: ...Q803 C804 R811 R810 0V L803 L813 C825 NF COIL C823 C824 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 3 10 11 5V 5V 5V 5V 5V 5V 5V 5V 5V R275 R278 R833 C838 R279 R280 R281 R282 R831 R834 R806 R276 R347 R346 C220 C221 C222 R274 C832 C831 R277 R832 R2...

Page 49: ...V 17 37 38 1 1 12 14 15 11 13 10 9 6 7 5 2 4 3 8 78 M I C O N Indoor P W B Outdoor P W B Terminal board Terminal board C D C2 D2 D101 I F 0V C821 R821 C822 0V 0V 0V 0V 5V 5V 5V 0V 0V 0V 5V 0V 0V 0V 0V I F 0V 0V IF transmit output SDO Indoor 4 IF receive input SDI Micro computer 5V 12V 5V 5V HIC 5V R813 R812 C802 Q803 C804 R811 R810 0V L804 L814 C835 NF COIL C833 C834 Interface relay 35V Communicat...

Page 50: ... 5 IF receive input SDI Micro computer 5V 5V 5V 12V 5V 5V Q201 5V 5V 5V HIC 5V R813 R812 C802 Q803 C804 R811 R810 SDO1 SDI1 16 77 0V L801 L811 C801 R802 Q801 5V R801 R803 D210 0V 0V 0V 0V 0V 0V 0V C805 NF COIL C802 C236 R253 R252 R251 R250 D215 C234 Q215 R244 R245 R248 R247 R246 R249 C803 C804 Interface relay 35V Communications from indoor micro computer to outdoor micro computer Communications fr...

Page 51: ... 60 3 System power Module Circuit ...

Page 52: ... 0V 5V 35V 35V 35V DC line Base of outdoor P W B Q801 Q802 Q803 Q804 Q805 Outdoor micro computer 17 16 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 53: ...itching transistor IC1 to convert DC330V to high frequency of approximately 20kHz to 200kHz Transistor IC1 operates as follows 1 Shifting from OFF to ON DC about 330V is applied from smoothing capacitors C020 and in the control power circuit With this power current flows to pin 7 of IC1 and IC1 starts to turn ON Since voltage in the direction of arrow generates at point c at the same time current ...

Page 54: ...ctor current from flowing to IC1 This SW power circuit uses a frequency as low as 20 kHz especially at a low load when both the indoor and outdoor units stop This reduces power loss in standby status Reference If the power circuit for P W B seems to be faulty 1 Make sure that 5V 12V 15V and 16V on the control P W B power voltage are the specified values 2 When only the 5V output is low REG 1 regul...

Page 55: ...rrent Id detection resistor A U coil DC compressor motor V coil W coil B Fig 4 2 System Power module circuit U is OFF V is ON Fig 4 5 Reference If active module or IPM is defective self diagnosis lamps on the power P W B may indicate as shown below ...

Page 56: ... 65 5 Reversing valve control circuit 3 1 16 1 V D841 OV IC9 Micro computer CN4 Reversing valve DC voltmeter or multimeter 35V 5V PQ841 R841 Q841 R832 R843 28 Fig 5 1 ...

Page 57: ...tive 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 converter 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 converter A D converter micro computer Fig 6 1 Overload...

Page 58: ... 67 7 Reset circuit 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 7 1 Fig 7 2 ...

Page 59: ... thermistor OH overheat thermistor 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 8 1 for model RAM 90QH5 and their roles and temperature measuring points are shown as Table 8 1 Fig 8 1 Temperature Detection Circuit ...

Page 60: ... 69 Electric expansion valve thermistor NARROW PIPE 5 5 5 5 8 8 8 ...

Page 61: ...op Be ware that only an open circuit for OH thermistor has to be checked in 5 minutes after the compressor starts If the unit operates abnormally after replacing the thermistor replace the control P W B because it malfunctions LED lighting mode Lights Lights Lights Lights Lights Lights Lights Lights Lights OH thermistor DEF thermistor Outdoor temperature thermistor Electric expansion value thermis...

Page 62: ...n is performed for 10 or 20 seconds During initialization measure all voltages at pins 4 to 1 of CN25 CN29 using mutimeter If there is any pin with voltage that has not changed from around 0 9V or 12V expansion valve or microcomputer is defective Fig 9 2 shows logic waveform when expansion valve is operating 9 Electric expansion valve Table 9 1 Pin Drive status Lear wire 1 ON OFF OFF OFF ON ON OFF...

Page 63: ...nal 750µs 12cycle output from Micon pin 32 29 1cycle of clock signal off 500µs on 250µs 2 Driving serial signal 1 output from Micon pin 34 31 same phase as clock signal 1 Serial signal is the method of current conducting only 1 or 2 phase out of 4 phase of windings of the electric expansion valve Due to the above 1 2 operation the internal shifting resistor value be updated After 250µs of the outp...

Page 64: ... 5 OUT4 Indoor 1 4 OUT3 Indoor 1 3 OUT2 Indoor 1 2 IC11 OUT1 Indoor 1 1 IC12 Serial Signal IC11 Serial Signal Latch Signal IC11 12 Clock Signal Serial Micon pin 33 OUT8 Indoor 4 8 OUT7 Indoor 4 7 OUT6 Indoor 4 6 OUT5 Indoor 4 5 OUT4 Indoor 3 4 OUT3 Indoor 3 3 OUT2 Indoor 3 2 IC12 OUT1 Indoor 3 1 OUT8 Indoor 2 8 OUT7 Indoor 2 7 OUT6 Indoor 2 6 ...

Page 65: ...me Chart Clock Micon pin 29 Latch Micon pin 30 0V 0V 0V Serial Micon pin 31 0V 0V 0V 0V IC13 OUT1 Indoor 5 1 IC13 Serial Signal Latch Signal IC13 Clock Signal 0V OUT2 Indoor 5 2 0V OUT3 Indoor 5 3 0V OUT4 Indoor 5 4 ...

Page 66: ...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 67: ...ection method 3 If is normal for LD301 to blink once after the power source has been inserted If the unit stops when it is in operation and LD301 blinks once it is possible that the power source has been temporarily interrupted by lightning or for some other reason Replace the control PCB if this occurs frequently Check to see that the LED is either on or blinking Carry out inspections by examinin...

Page 68: ...outdoor 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 30A 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 Replace ...

Page 69: ...hat 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 IPM board may be broken Replace the IPM board The IPM board may be broken Replace the IPM board Cable abnormally Cable abnorma...

Page 70: ...or fan is rotating No No LD 301 Blinks six times Overheating stop 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 NO CHANGE still same Replace MAIN P W B NO CHANGE still same Check the compressor Replace POWER P W B Replace the electric expansion valve There is ...

Page 71: ...om the DB2 Connect the power source again and forcibly turn on the cooling clicking noise Then check the DC voltage between the gray and red wire with in three minutes of power relay being turned on AC 187V 276V No DB2 may be broken Replace the DB2 Replace the Power P W B Less then 187V or more than 276V Less than 10V Connect the power source then wait for few minutes and forcibly turn on the cool...

Page 72: ... 85 ...

Page 73: ...f you do 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 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 diameter service valve using the reducing union and copper pipe as shown on the right Charge re...

Page 74: ...fter 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 ø220 240V 50 60Hz N L ACT Module IPM Smoothing Capacitor Compressor motor Main P W B C DC 35V 0V Control P W B D...

Page 75: ... of about 360V is charged at both ends of smoothing capacitor 330µF x 6 High voltage DC 360V is also charged at terminal sections of ACT module and power module During continuity check of each circuit of electrical parts in outdoor unit is performed to prevent secondary trouble disconnect red gray wire connected to ACT module from diode stack Also be sure to perform discharging of smoothing capaci...

Page 76: ... 90 Lighting mode self diagnosis lamp Location of self diagnosis lamp 1 RAM 90QH5 ...

Page 77: ... 91 Lighting mode self diagnosis lamp 2 RAM 90QH5 ...

Page 78: ... 92 TROUBLESHOOTING OF THE INTELLIGENT POWER MODULE IPM Terminal Intelligent Power Module IPM Do not disassemble the IPM when troubleshooting is performed PS21869 P ...

Page 79: ...t in battery is set in reverse direction and terminals are reversed CAUTION If inner circuit of power module IPM is disconnected open the indicator of tester will not swing and this may assumed as normal In this case if indicator swings when and terminals are connected in reverse of diagram below it is normal Furthermore compare how indicator swings at U V and W phases If indicator swings the same...

Page 80: ... 94 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL RAM 90QH5 3 4 5 6 7 10 9 8 28 11 12 13 14 17 18 21 22 23 24 25 38 39 29 30 32 34 35 36 37 26 27 41 43 45 46 2 48 1 16 31 42 20 19 49 15 47 33 44 ...

Page 81: ...E 14 PMRAC 70YHA 906 1 NET 15 PMRAC 25NH4 910 1 OLR COVER 16 PMRAM 90QH5 909 1 P W B MAIN 17 PMRAM 90QH5 910 1 PROPELLER FAN 18 KPNT1 001 3 PUSH NUT 19 PMRAM 90QH5 911 1 PWB POWER 20 PMRAM 90QH5 912 1 REACTOR 21 PMRAC 50YHA1 905 1 REVERSING VALVE 22 PMRAM 90QH5 913 1 PLATE 23 PMRAM 90QH5 914 1 SIDE PLATE R 24 PMRAM 90QH5 915 1 STRAINER CO PIPE AS 1 25 PMRAM 90QH5 916 1 STRAINER ST PIPE AS 26 PMRAM...

Page 82: ...90QH5 927 1 VALVE 3S 39 PMRAM 90QH5 928 1 VALVE 5S 41 PMRAM 90QH5 929 5 EXPANSION VALVE 42 PMRAM 90QH5 930 1 PWB CAPA 43 PMRAM 65QH4 907 1 SUPPORT DEF THERMISTOR 44 PMRAC 25NH4 909 1 SUPPORT OH THERMISTOR 45 PMRAM 90QH5 932 1 BACKPLATE 46 PMATRIX590MXN 901 1 FRONTPLATE 47 PMRAC 40CNH2 902 1 DIODE STACK 48 PMRAC 18CVP2 901 1 2P TERMINAL 49 PMRAM 90QH5 931 1 IPM BOARD PART N0 RAM 90QH5 NO Q TY UNIT ...

Page 83: ...HITACHI PM NO 0371E Printed in Malaysia RAM 90QH5 ...

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