Hitachi RAC-18WPE Service Manual Download Page 41 | Manualshive

Page: 41 / 60

Hitachi RAC-18WPE Service Manual Download Page 41

TROUBLE SHOOTING

MODEL RAC-18/25/35/42/50WP

E

Note that the 0 V line of the
outdoor electrical parts and
the primary power circuit of
the indoor electrical parts
have voltages to ground as
illustrated in the right-hand
figure.

When conducting a check
with an oscilloscope or
something similar, do not
ground the oscilloscope.
Note that the oscilloscope
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

Power supply

Po

w

er circuit

Control circuit

Control circuit

Indoor fan motor

Outdoor Electrical

Indoor Electrical

1

2

3

L

N

0V line

P

ow

er circuit

Compressor

motor

Voltage between each

part and ground

Potential at

points

Potential at

points

320V

Potential at points

1

Φ

230V 50Hz

375 F

Power supply

Po

w

er circuit

Control circuit

Control circuit

Indoor fan motor

Outdoor Electrical

Indoor Electrical

1

2

3

L

N

0V line

P

ow

er circuit

Compressor
motor

1

Φ

230V 50Hz

500 F

3

0V line

RAC-18/25/35WP

E

RAC-

42/

50WP

E

41

«
...
39
40
41
42
43
...
»

Summary of Contents for RAC-18WPE

Page 1: ...OTAL AMPERES A CAPACITY DIMENSIONS mm 1 120 300 1 700 32 5 NET WEIGHT TYPE DC INVERTER 1 PHASE 50Hz 220 230V 5 10 4 88 4 20 1 70 5 00 14 330 5 800 17 060 18 430 5 800 20 470 5 99 5 73 1 317 500 2 100 5 40 1 70 6 00 PE RAC 18W 750 65 548 288 27 5 419 250 1 010 32 5 1 PHASE 50Hz 220 230V 2 46 2 35 519 250 970 2 93 2 81 8 530 3 070 10 920 2 00 0 90 2 5 6 820 3 070 8 530 2 50 0 90 3 20 733 250 1500 3 ...

Page 2: ...UUHQFH RI DQ DFFLGHQW VXFK DV HOHFWULFDO VKRFN OHDN RI FXUUHQW RU ERGLO LQMXU GXH WR WKH GURS RI DQ SDUW R FKHFN WKH LQVXODWLRQ RI WKH XQLW PHDVXUH WKH LQVXODWLRQ UHVLVWDQFH EHWZHHQ WKH SRZHU FRUG SOXJ DQG JURXQGLQJ WHUPLQDO RI WKH XQLW 7KH LQVXODWLRQ UHVLVWDQFH VKRXOG EH 01 RU PRUH DV PHDVXUHG E D 9 PHJJHU 7KH LQLWLDO ORFDWLRQ RI LQVWDOODWLRQ VXFK DV ZLQGRZ IORRU RU WKH RWKHU VKRXOG EH FKHFNHG IR...

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: ...d 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 operation when the...

Page 6: ...ICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL NO NO NO YES INTERNAL YES NO NO YES YES YES IC NO WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNIT PIPES MAX 20m 1050g MIN 3m 47W DC120 380V 15A 2A 3A 3 15A 25A 2A 3A 3 15A YES REFRIGERANT CHARGING VOLUME Refrigerant R32 870g HF161F T R10471 ERZVA9V431 V RAC 18 25 35WPE RAC 42 50WPE GSD088SKQA6J...

Page 7: ...should all be insulated 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 above 100mm above 300mm above 50mm give clearance as wide as possible above 200mm above 50 mm when installed on the ceiling of b...

Page 8: ...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 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 9: ...More than 300 Service space More than 200 NOTE 1 For outdoor unit installation allow at least 2 sides of space around the unit ensure ventilation flue 2 The connecting pipe should all the insulated 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 18 25...

Page 10: ...ulated 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 42 50WPE OUTDOORUNIT 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 10 ...

Page 11: ...ET RAC 18 25 35 42 50WPE 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 18 25 35 42 50W 46Ω PHASE AT 2 RAC 18 25 35 42 50W 2780Ω 0 RAC 18 25 35W COIL EXPANSION VALVE REACTOR 15 mH 226 m MAX 20 C RAC 50W 5 3 mH 67 m MAX 20 C PE PE PE PE ...

Page 12: ...y 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 2 167 2M 1 354 M RAC 42 50WPE RAC 18 25 35WPE RAC 42 50WPE RAC 18 25 35WPE 220 350 V OUTPUT 1350W GTD130UKQA8JT6 GSD088SKQA6JK6 840W 12 ...

Page 13: ...WIRING DIAGRAM RAC 18 25 35WPE RAC 42 50WPE 13 ...

Page 14: ...MODEL RAC 18 25 35WPE 14 AX 16G814 ...

Page 15: ...MODEL RAC 42 50WPE 15 ...

Page 16: ...g 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 16 ...

Page 17: ...COOLING CYCLE OUTDOOR UNIT HEATING CYCLE OUTDOOR UNIT MODEL RAC 18 25 35WPE Silencer Silencer Indoor unit Indoor unit Silencer Silencer Silencer Silencer 17 ...

Page 18: ...COOLING CYCLE OUTDOOR UNIT HEATING CYCLE OUTDOOR UNIT MODEL RAC 50WP １２１４１２１４ 42 E Silencer Silencer Silencer Silencer Silencer Silencer Indoor unit Indoor unit 18 ...

Page 19: ...over to remove it Fig 1 OUTDOOR UNIT MODEL RAC 18 25 35WPE 1 Electrical parts E Procedure for Disassembly and Reassembly Fig Fig 2 4 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 electrical box lock screw 4 Remove the terminal cover loc...

Page 20: ...L N 300 330 Main parts L N C021 C022 37 5 420V 1 5 DESCRIPTION OF MAIN CIRCUIT OPERATION RAC 18 25 35WPE 20 ...

Page 21: ...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 Fig 2 1 21 ...

Page 22: ...2V 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 R120 B 12V R120 B 0V 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 22 ...

Page 23: ...essor 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 Valv...

Page 24: ...5 5 1 10 11 12 74 74 70 70 74 75 5 1 HIC P W B 74 70 75 24 ...

Page 25: ...6 Electric expansion valve circuit 48 47 46 45 13 14 15 16 4 3 2 1 68 67 66 65 RED 14 12 10 7 6 1 8 6 1 6 2 25 ...

Page 26: ...2A Fuse DC300 330V 7 7 1 26 ...

Page 27: ...2A DC300 330V 60 100 27 ...

Page 28: ...L N 300 330 L N 42 50WPE 28 ...

Page 29: ...300 330 C021 C023 500 450V 16V R249 33 ACT IP CUT 30 29 ...

Page 30: ...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 30 ...

Page 31: ...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 31 ...

Page 32: ...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 33: ...5 5 1 74 74 70 70 74 75 5 1 HIC P W B 40 41 42 74 70 75 33 ...

Page 34: ...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 34 ...

Page 35: ...2A Fuse DC300 330V 7 1 7 35 ...

Page 36: ...2A DC300 330V 30 60 36 ...

Page 37: ...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 38: ...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 39: ...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 40: ...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 41: ...der any circumstances get your hand or metal part into contact with the cabinet Danger Do not install a grounding Inspection instructions Power supply Power circuit Control circuit Control circuit Indoor fan motor Outdoor Electrical Indoor Electrical 1 2 3 L N 0V line Power circuit Compressor motor Voltage between each part and ground Potential at points Potential at points 320V Potential at point...

Page 42: ...t of the outdoor unit be sure to discharge the smoothing capacitors Discharge Procedure LEAD WIRE RAC 18 25 35WPE MAIN P W B 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 volt...

Page 43: ...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 44: ...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 45: ...SELF DIAGNOSIS LIGHTING MODE MODEL RAC 18 25 35WPE 45 ...

Page 46: ...SELF DIAGNOSIS LIGHTING MODE MODEL RAC 42 50WPE 46 ...

Page 47: ...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 48: ...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 using the forcible cooling switch and check the blinking freq...

Page 49: ...al 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 using the forcible ...

Page 50: ...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 51: ...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 52: ...e outdoor fan motor or outdoor electrical parts After restarting the product will run continuously It stops Check the 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...

Page 53: ...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 54: ...r the self 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 e...

Page 55: ... 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 p...

Page 56: ...47 40 6 7 12 20 8 25 28 27 23 22 21 19 18 43 42 24 26 10 4 46 45 29 38 39 30 44 33 49 37 34 35 31 41 36 32 OUTDOOR UNIT MODEL PARTS LIST AND DIAGRAM RAC 18WPE RAC 25WPE RAC 35WPE 16 3 2 14 15 13 17 11 9 5 56 ...

Page 57: ... SOUND PROOF COVER ASS Y 39 1 SOUND PROOF COVER ASS Y 40 1 BUSH ASSEMBLY 41 1 ELECTRIC PARTS COVER 42 1 TOP COVER 43 1 SERVICE VALVE COVER 44 1 SIDE COVER R 45 1 COVER OUT DOOR THERMISTOR 46 1 THERMISTOR OUTDOOR TEMPERATURE 47 1 DRAIN PIPE 48 1 BUSH 49 2 FUSE 3 15A HWRAC 25YHA5 A21 JCH WH PARTS NO NO Q TY UNIT PARTS NAME HWRAC 18WPD A06 HWRAC 18WPD A07 HWRAC 35WPC A09 HWRAC 18WPD A08 HWRAC 18WPD A...

Page 58: ...38 39 37 17 15 18 13 14 12 11 10 34 46 33 19 20 21 24 23 22 28 30 32 25 43 41 42 31 44 40 3 8 5 6 7 16 4 27 36 45 29 26 35 9 50 49 OUTDOOR UNIT MODEL PARTS LIST AND DIAGRAM RAC 42WPE RAC 50WPE 47 48 58 ...

Page 59: ... SUPPORT2 P W B 43 1 HEAT SINK 44 HWRAC 42WPE A01 HWRAC 50WPE 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 SOUND PROOF HWRAC 50WED A16 HWRAC 50WED A17 HWRAC 25WXD A11 HWRAC 50WEB A13 HWRAC 25WXD A04 Q TY UNIT HWRAC 50NX2 A38 HWRAC 50WEC A17 HWRAC 50WED A14 HWRAC 50WEB A07 RAC 1F50KVY014 HWRAC 50WEB A11 HWRAC 50WEC A15 HWRAC 50WEC ...

Page 60: ...RAC 18WPE RAC 25WPE RAC 35WPE RAC 42WPE RAC 50WPE JCH WH NO 0120E 60 ...

Reviews:

No comments