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Hitachi RAC-25WXEN, Service Manual, Page: 27 / 52

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Hitachi RAC-25WXEN Service Manual Download Page 27

6. Electric  expansion  valve  circuit

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Summary of Contents for RAC-25WXEN

Page 1: ...0V 1 PHASE 50Hz 220 230V 481 250 1 000 2 73 2 61 3 20 0 90 4 20 10 920 3 070 14 330 3 74 3 57 3 67 3 51 13 650 3 070 16 380 2 92 2 79 2 50 0 90 3 10 8 530 3 070 10 580 6 36 6 09 3 50 0 90 4 00 5 00 1 90 5 20 11 940 3 070 13 650 17 060 6 480 17 740 6 44 6 16 1 415 500 2 700 4 00 0 90 4 80 5 80 2 20 7 00 XEN XEN XEN 792 65 600 299 27 5 38 2 800 63 736 350 35 5 51 7 800 250 1 600 RAC 25WXEN RAC 35WXE...

Page 2: ... DANGER 2 ...

Page 3: ... rejected goods should be handled in the same way 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 body earth is being taken 4 Be sure to pla...

Page 4: ...rcuits for maintenance inspection or some others be careful not to have the test probes of the measuring instrument short circuit a load circuit or the like Bare copper wire for body earth Metal plate of Al stainless steel etc Working table Resistor 1MΩ 1 2W Earth wire Staple Fig 3 Grounding of the working table soldering iron Grounding wire Screw stop at the screwed part using a rag plate 4 ...

Page 5: ...r missoperation and re start in a moment there is occasion 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 ...

Page 6: ...SPECIFICATIONS 3 RAC 25 35WXEN SHEATHED HEATER 200W AC 230V RAC 50WXEN 6 ...

Page 7: ...hen wrapped with vinyl tape The insulator will deteriorate if it is not wrapped with tape The connection of insulated drain hose Inner diameter 16mm Please use insulated drain hose for the indoor piping commercial product above 100mm above 00mm above 50mm give clearance as wide as possible above 200mm above 50 mm when installed on the ceiling of balcony above 200mm Maximum pipe length 20m Minimum ...

Page 8: ... with insulation pipe and then wrapped with vinyl tape The insulator will deteriorate if it is not wrapped with tape The connection of insulated drain hose Inner diameter 16mm Please use insulated drain hose for the indoor piping commercial product Maximum pipe length 30m Minimum pipe length 3m Figure showing the installation of lndoor and Outdoor unit MODEL RAC 50WXEN above 200mm above 200mm give...

Page 9: ...ated with insulation pipe 3 Piping length is within 20m 4 Height d fferent of the piping between the indoor unit and outdoor unit s ould be within 10m i h CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC 25 35WXEN OUTDOOR UNIT More than 200 More than More than 300 600 345 299 202 163 5 589 92 59 792 877 55 57 190 147 12 11 Drain hole Drain hole Drain hole 27 9 ...

Page 10: ...lation pipe 3 Piping length is within 20m 4 Height d fferent of the piping between the indoor unit and outdoor unit s ould be within 10m h i CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC 50WXEN OUTDOOR UNIT More than 200 880 5 800 74 6 5 736 408 5 350 111 5 35 5 23 30 706 175 103 5 543 5 133 12 50 395 361 10 202 5 More than 50 More than 100 More than 700 More than 200 10 ...

Page 11: ...IOLET RAC 25 35 50WXEN THERMOSTAT Room temperature Thermistor CONNECTION MODEL E C R U O S R E W O P T U P T U O V 0 8 3 0 2 1 C D W 7 4 WHT V BLK W M M M RED U PARTS NAME RESISTANCE VALUE Ω APPLICABLE MODELS COIL REVERSING VALVE RAC 25 35 50WXEN 46Ω PHASE AT 20 RAC 25 35 50WXEN 2780Ω 0 COIL EXPANSION VALVE REACTOR 5 3 mH 67 mΩ MAX 20 C RAC 25 35 50WXEN SHEATHED HEATER 266Ω RAC 25 35 50WXEN 20 C 1...

Page 12: ...apillary tubes clogged or crushed or with too little refrigerant check the color of the refrigerating machine oil inside the compressor If the color has been changed conspicuously replace the compressor U V W M M WHITE YELLOW RED 75 220 350 V 2M 1 354 2M 1 354 M RAC 50WXEN RAC 25 35WXEN RAC 25 35 50WXEN 220 350 V OUTPUT 1400W GTD141UKQA8JT6 GSD102UKQA6JT6A 790W 12 ...

Page 13: ...WIRING DIAGRAM MODEL RAC 25 35 50WXEN 13 ...

Page 14: ...MODEL RAC 25 35 50WXEN 14 ...

Page 15: ...on valve Reversing valve Outdoor Fan motor Is Ip Id Ip Id AX 16G814 series Outdoor DC fan motor drive circuit Compressor motor Compressor drive circuit OUTDOOR UNIT Power source Outdoor microcomputer Indoor Outdoor interface circuit Power circuit Control power circuit Reset circuit Overheat thermistor Defrost thermistor Outdoor temperature thermistor Oscillator clock circuit L N Indoor unit 15 ...

Page 16: ...ch otherwise will cause damage to the Main PCB 16 1 0 1 HI HI LO LO SWITCH POSITION OPEN THE TEMPERATURE NOTE 2 See page 17 for a detailed description of the 1 Factory default setting is at LO sheathed heater SHEATHED HEATER TO SELECT SWITCH LO OR HI CAUTION SHEATHED HEATER MODEL RAC 25 35 50WXEN 16 ...

Page 17: ...ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON 25 26 27 28 29 30 19 20 21 2...

Page 18: ...COOLING CYCLE OUTDOOR UNIT HEATING CYCLE OUTDOOR UNIT MODEL RAC 25 35WXEN Indoor unit Silencer Silencer Silencer Indoor unit Silencer Silencer Silencer 18 ...

Page 19: ...COOLING CYCLE OUTDOOR UNIT HEATING CYCLE OUTDOOR UNIT MODEL RAC 50WXEN Indoor unit Silencer Silencer Indoor unit Silencer Silencer Silencer Silencer 19 ...

Page 20: ...trical parts Procedure for Disassembly and Reassembly Fig 2 3 Remove the electrical box lock screw 4 Remove the terminal cover lock screw 5 Remove each connector and earth cable from x o b l a c i r t c e l e e h t e v o m e r n e h T e r i w d a e l e h t 3 Remove the front cover lock screw 4 Lower the right side of the front cover and pull it forward Then remove the cover from the hook 5 Pull th...

Page 21: ...L N 300 330 L N 6 5 37 21 2 0 1 5 8 7 23 5 7 21 21 ...

Page 22: ...300 330 C021 C023 500 450V 16V R249 33 ACT IP CUT 30 22 ...

Page 23: ...trol IC ICI switching transformer 1 B 12V Power supply for electrical expansion valve 2 16V Power supply for IPM driver circuit of compressor and fan motor IGBT action 3 12V Power supply for 4 way valve relay power relay inrush current relay motor current amplification 4 5V Power supply for microcomputer peripheral circuits 23 ...

Page 24: ...12V DC5V 001 C002 C003 C004 C005 C011 C013 C014 NF1 1 2 5 8 L105 JUMPER D110 EARTH L104 JUMPER D110 EARTH L103 JUMPER D110 EARTH R418 B 12V B 12V O P Expansion valve Main parts 1 2 2 3 0 5V 1 5V 1 0V 15 5 2 5V 1 0V 13 1 0 4 C 24 ...

Page 25: ...starts operation the current is applied twice at the interval of 1 sec as shown in Fig 4 1 During forced cooling operation just after the forced cooling switch turns on the current is applied twice at the interval of 1 sec as shown in Fig 4 1 When the operation stops the position of the valve before the stop is held Before checking the application of current to the reversing valve 4 way Valve disc...

Page 26: ...5 5 1 74 74 70 70 74 75 5 1 HIC P W B 40 41 42 74 70 75 26 ...

Page 27: ...6 Electric expansion valve circuit 5 13 14 15 16 4 3 2 1 68 67 66 65 RED 14 12 10 7 6 1 8 6 1 6 2 22 23 24 2 27 ...

Page 28: ...2A Fuse DC300 330V 7 1 7 28 ...

Page 29: ...2A DC300 330V 30 60 29 ...

Page 30: ...s enhanced When the outdoor temperature is higher than a certain temperature 7 3 C the protector will work arel The power supply of base heater will be cut off When the base heater exceeds 119 C the temp fuse will act and cut off the power supply 8 Base Heater Circuit CN4 FU5 3A Fuse AC230V RL5 Heater relay VH3P Base Heater Temp Fuse protector 30 ...

Page 31: ...ng the product will run for 30 seconds with a slight wind When set to strong wind the product will begin with a slight wind operation producing a weak wind for 30 seconds and then switch to strong wind A2 A3 When heating is conducted despite the high outdoor temperature the product may stop to protect its equipment The auto fresh defrost should be working When stopped the product will check its ou...

Page 32: ...ivate a preliminary operation for 1 minute At that time heating will cause the operation lamp to blink This is not a sign of a breakdown A5 The room structure air stream or other factor may cause a gap between the room temperature setting and actual room temperature If there is any difference between the setting and the room temperature adjust the temperature setting to match the living space to a...

Page 33: ...with the ON timer If the end time of the sleep timer is past the time set with the ON timer you cannot make that setting A4 Is the time not past the reserved time The set time disappears when the current time reaches the reserved time A3 The current time disappears 10 seconds later The timer set display is given priority A2 Have you set the product to the current time The timer cannot be set unles...

Page 34: ...idification and the air conditioner is in a pause The product will begin again to run within about 3 minutes The product will run with the wind speed set to a quiet state A5 The temperature setting field on the remote control unit displays ć or ć The remote control unit will give no display in response to a push of the vertical vane button The remote control unit displays nothing The product will ...

Page 35: ...pe will be subjected to voltages as illustrated in the figure above Warning Warning Do not under any circumstances get your hand or metal part into contact with the cabinet Danger Do not install a grounding Inspection instructions Voltage between each part and ground Potential at points Potential at points 320V Potential at points Power supply Power circuit Control circuit Control circuit Indoor f...

Page 36: ...ty check for each circuit part of the outdoor unit be sure to discharge the smoothing capacitors Discharge Procedure 1 Turn off the power 2 After power is turned off wait for 10 minutes or more Then remove electrical parts cover and apply soldering iron of 30 to 75 W for 15 seconds or more to IPM 24 and IPM terminals on the main P W B as shown in the figure below in order to discharge voltage in s...

Page 37: ...ll destroy it Be on guard When reconnecting it insert it securely all the way home All the receptacles for connecting tab terminals are with a locking mechanism Forcibly pulling any such receptacle without unlocking it will destroy it Be on guard When reconnecting it insert it securely all the way home Pinch the locking mechanism with your fingers and pull it out unlocked Other instructions 1 Deta...

Page 38: ...r several days you can read the failure modes and check them thereby detecting the less frequent failure phenomena Failure modes can be checked by both the blinking of the lamp of the indoor unit and the display of the remote control liquid crystal display The failure mode detected on the outdoor unit side is displayed by ǂblinking the LD301 Detecting a failure will stop the outdoor unit ǂand keep...

Page 39: ...SELF DIAGNOSIS LIGHTING MODE MODEL RAC 25 35 50WXEN 39 ...

Page 40: ...e power circuit normal Just in case put the power on one The LD301 will not go on and the power circuit is normal Replace the outdoor electrical parts in the case of an abnormality in the microcomputer or LED Check the indoor electrical parts It may have a power relay abnormality communication error or something similar Replace the outdoor electrical parts in the case of an abnormality in the powe...

Page 41: ...e outdoor electrical parts in the case of an abnormality in the communication circuit Correct the abnormal location Abnormality in equipment other than the electrical parts The LD301 blinks once Reset stopped If the indoor unit is either of the following states it will blink once Ionmist in progress 2 hours before the ON timer Turn the power back on run the product either by remote control or by u...

Page 42: ...n abnormality in the thermistor detection circuit Check the OH thermistor for wire breaks and short circuits Replace the OH thermistor Check if the OH thermistor is not loose or poorly inserted Connect the OH thermistor Normal Normal Normal Normal Normal Review the freezing cycle Refrigerant leakage or other reason is conceivable If reviewing the freezing cycle does not correct the problem replace...

Page 43: ...imit cut When cooling Is the heat exchanger of the outdoor unit clogged up Is there shelter around When heating Is the heat exchanger or filter of the indoor unit clogged up Is the freezing cycle abnormal Remove the cause of the problem Correct the abnormal location Since the compressor load was heavy the product was stopped Yes No No No Yes Yes Clear up the causation Does the service valve open N...

Page 44: ...e outdoor fan motor For details see the page on the outdoor fan motor or the instruction plate on the lid of the electrical parts Is the outdoor fan motor abnormal Fan motor abnormal Replace the outdoor fan motor Fan motor normal Replace the outdoor electrical parts in the case of an abnormality in the drive circuit of the outdoor fan Check the fan motor for loose connectors Insert the connector Y...

Page 45: ...e Replace it and seal refrigerant If the compressor checker for an inverter type air conditioner is available re check using it JUDGING BETWEEN GAS LEAKAGE AND COMPRESSOR DEFECTIVE Blinking off Time until the lamp lights Approx 10 seconds Approx 10 seconds Approx 10 seconds Within Approx 30 seconds Compressor Compressor Gas leakage Possible malfunctioning part LD301 Self diagnosis lamp Lighting mo...

Page 46: ...check diagnosis starts In this case turn the power off and start the procedure from 1 again For the initialization of the expansion valve it may take 1 min until the operation starts after the power turns on confirm that the LD301 changes to blinking 9 times communication error 2 Confirm that the LD301 blinks once from the terminal side of the outdoor unit Afterwards when about 30 sec elapses 3 Wh...

Page 47: ...he test switch is over turn off the breaker and set the connectors back HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY 1 Connect the large dia pipe side and small dia pipe side service valve using a pipe Parts to be prepared 1 Reducing union 6 35 mm 3 8 9 52 mm 2 Copper pipe 1 4 and 3 8 Connect the small diameter service valve and the large diameter service valve using the reducing union and copper...

Page 48: ... 15 18 13 14 11 10 34 46 33 19 20 21 24 23 22 28 30 32 25 43 41 42 39 31 44 40 8 5 6 7 16 4 27 36 45 29 26 35 9 49 OUTDOOR UNIT MODEL RAC 25WXEN RAC 35WXEN PARTS LIST AND DIAGRAM 47 48 3 12 38 50 37 51 48 ...

Page 49: ... 2 SUPPORT2 P W B 43 1 HEAT SINK 44 HWRAC 25WXEN A01 HWRAC 35WXEN A01 1 P W B MAIN 45 2 CORD REACTOR 46 1 TERMINAL BOARD 5P 47 1 FUSE 25A 48 2 FUSE 3 15A 49 1 SUPPORT1 P W B 50 1 ONDO FUSE 51 1 B THERMO HWRAC 25WXDN A11 HWRAC 25WXDN A12 RAC 1F50KVY 014 HWRAC 50WEB A11 HWRAC 50WED A16 HWRAC 50WED A17 HWRAC 25WXD A11 HWRAC 50WEB A13 HWRAC 18WSPA A09 HWRAC 25WXDN A06 HWRAC 25WXDN A07 HWRAC 25WXDN A08...

Page 50: ...4 16 19 17 8 7 49 15 10 14 12 54 13 3 35 11 48 5 20 21 22 25 24 23 29 28 51 26 44 27 36 42 43 32 37 39 46 47 41 38 39 53 34 55 52 45 30 50 OUTDOOR UNIT MODEL PARTS LIST AND DIAGRAM RAC 50WXEN 31 33 40 57 56 50 ...

Page 51: ...B A18 TER PLATE HWRAC 50WXB A19 TOP COVER HWRAC 50WXD A15 TERMINAL COVERAS HWRAC 50WXDN A05 SIDE COVER R HWRAC 50WXDN A06 COVER OUT DOOR THERMISTOR HWRAC 50WXB A27 PC SUP HWRAC 50WXB A12 DISCHARGE GRILL HWRAC 50WED A17 FUSE 25A HWRAC 50WXB A14 THERMI C HWRAC 50WXB A09 NET LEFT HWRAC 50WXB A10 LEFT PLATE HWRAC 50WXDN A04 FRONT COVER HWRAC 50WED A10 FAN MOTOR HWRAC 50WXB A07 PROPELLER FAN HWRAC 50NX...

Page 52: ...RAC 25WXEN RAC 35WXEN RAC 50WXEN JCH WH NO 0123E 52 ...

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