Toshiba RAC-08EW-E, Service Manual

Page 1: ...SERVICE MANUAL ROOM AIR CONDITIONER PORTABLE TYPE FILE NO A00 9607 RAC 08EW E PRINTED IN JAPAN Mar 1996 S ...

Page 2: ...e 10 10 3 Dry Mode 11 10 4 Economy Operation 11 11 TROUBLESHOOTING CHART 12 11 1 What to be Prechecked First 12 11 2 How to Judge Faulty Parts by Symptoms 13 11 3 PC Board Layout 22 12 INSTALLATION INSTRUCTION 24 12 1 Installation Method 24 12 2 Routine Maintenance 24 12 3 Water Supply 24 12 4 Changing of Water 25 12 5 Relocation of Air Conditioner 25 13 CLEANING METHOD OF CONDENSER 26 13 1 Conden...

Page 3: ...400 410 1 2 3 82 3 80 3 85 780 800 840 93 92 91 PH94X1 4G1 750W Ripple tube type Forced air ventilation Finned tube type Aircooled ventilation Finned tube type Aircooled ventilation Float switch Over current relay 20W Induction motor R 22 Charged quantity 0 47 kg Polypropylene net filter 3 core One core for grounding 1 9 m 6 4 ft length with plug Exhaust hose Caster seat Exhaust hole Cap for exhau...

Page 4: ... resistance Ω at 20 C Single phase 50 Hz 230V AC 20W output Winding resistance Ω at 20 C 400V 20µF for compressor 500V 1µF for fan motor 250V 3A for fan motor 250V 15A for compressor Rated current 0 1A 100V DC Primary 220V 240V Secondary 12 3V 13 6V Differential 2 C Adjustable range 17 28 C Differential 2 C Copper wire minimum 1 0 mm2 6 3A Parts name Compressor Fan motor Running capacitors Relay F...

Page 5: ... 3 CN01 CONTROL PC BOARD WHI RED BLU BLU TRANSFORMER VARISTOR F01 FUSE 6 3A C35 1 2 3 4 5 6 1 2 3 4 5 6 CN03 COMPRESSOR RUNNING CAPACITOR RED BLK WHI RED BLK CR01 RY07 RELAY 4 2 3 1 FAN MOTOR WHI BLK ORN BLU GRY RED CR03 RY01 RY02 RY03 RUNNING CAPACITOR SINGLE 50Hz 220 230 240V BLU BRW GRN YEL GRY BRW WHI BLK RED BLU GRN YEL ORN GRAY BROWN WHITE BLACK RED BLUE GREEN YELLOW ORANGE Color Identificat...

Page 6: ... 6 6 COOLING CHARACTER CHART Fig 6 1 Humidity 2 7 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 C Ambient temperature Cooling Capacity kW 40 50 60 70 2 6 2 5 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7 ...

Page 7: ...h temperature Low temperature 7 REFRIGERATING CYCLE DIAGRAM RAC 08EW E Fig 7 1 RAC 08EW E Table 7 1 Note Measure the heat exchanger temperature at the center of U bend By means of thermistor thermometer Capillary tube I D 1 2 mm O D 2 04 mm Length 400 mm Evaporator T1 Suction tube I D 6 8 mm O D 8 0 mm Comp ressor Sub condenser air Delivery tube I D 4 8 mm O D 6 0 mm Main condenser Water T2 ...

Page 8: ...or Warning indicator Timer selector ON CONTINUE OFF Timer setting Air flow selection Fan selector High Low AUTO Operation ON OFF Temperature setting Economy selection ON OFF Room temperature sensor Ta sensor Power supply circuit Relay driver Miniature relay Relay driver Transformer Power relay Heat exchanger sensor Tc sensor AC input DC 12 volt DC 5 volt Compressor ON OFF signal Fan motor signal C...

Page 9: ...the OPERATION lamp will light up and the air conditioner will start operating Lamps OPERATION green ECONOMY green TIMER yellow WARNING red I O button Push this button to start the air conditioner push it again to stop it ECONOMY button Push this button to start the economy operation push it again to cancel the economy operation Upon expiry of the number of hours set using the TIMER knob the air co...

Page 10: ...or detects and controls the adequate temperature 5 When the FAN SPEED selector switch is set to AUTO the volume of air is controlled to be felt agreeable 10 2 Economy Mode This control mode establishes some zones corre sponding to different combinations of on and off in tervals of the compressor and selects a suitable zone depending on the lapse of time from the start of op eration and the tempera...

Page 11: ... When monitoring OFF 3 An interval operation will be started from OFF time But when starting operation it will be kept in ON position for 6 minutes Fig 10 2 10 4 2 Dry Operation 1 ON OFF interval operation both of the compres sor and fan will be performed At the OFF time both of the compressor and fan will be set to OFF 2 Wind capacity is of L 3 An interval operation will be performed in Ta Ts con...

Page 12: ...s a program operation incorporated in a microcomputer If a claim is made about the operation check it corresponds to the contents in Table 11 1 If it does it is an indis pensable operation for the control and maintenance of the air conditioner but not a failure of the units Operations which are not deemed trouble Table 11 1 Description The operation lamp flashes indicating that power is turned on ...

Page 13: ...ally inoperable Some parts are inoperable Operable but abnormal 1 Unit is inoperable 2 Breaker or fuse blows out 3 Only fan does not work 5 Compressor does not operate 6 Unit repeats ON OFF frequently Short cycles 7 Cooling is not obtained or insufficient 8 Drying is not obtained or insufficient 9 Water leaks 10 Abnormal noise 4 Compressor does not operate Fan is also inoperable a No power turns o...

Page 14: ... control panel flash Control panel ass y is faulty Turn power ON YES YES NO NO Operations Remedies Check items Major possible causes Item by symptom Operations Remedies Check items Major possible causes Item by symptom Turn power switch OFF wait 5 seconds and turn switch ON again Does operation lamp on control panel flash When the control panel I O button is turned ON does power go on Control PCB ...

Page 15: ... Do fan relays RY01 RY02 and RY03 change over Points to which multimeter probes are applied Connector CN03 COM RED H RY01 BLK M RY02 ORN L RY03 BLU When each relay is ON Condition Normal voltage value AC220 230 240V NO Check Fan motor winding resistance Points to which multimeter probes are applied BLACK BLUE BLACK BLUE RED WHITE ORANGE ORANGE 49 47 32 32 Condition Nolmal resistance value W Replac...

Page 16: ...s to which multimeter probes are applied Polarity Q02 E RY07 ON Polarity Condition Normal voltage value DC11V DC Voltage between CN02 and GND 10 C 20 C 30 C Does operation lamp come on normally Turn power ON Does operation lamp on remote controller flash Compressor is faulty Replace compressor Power relay RY07 is faulty Replace power relay RY07 5 1 4V 1 4V 1 4V Room temperature sensor is faulty Re...

Page 17: ...pressor is faulty Measure the current If 3 or 4 times the rated current continues for several seconds it means the compressor is faulty Measure the continuity of the compressor If disconnected the compressor is faulty Check the power relay PCB assembly Is the voltage across terminals 1 and 2 220 230 240VAC Terminal RY07 YES YES YES NO NO NO Operations Remedies Check items Major possible causes Ite...

Page 18: ...ty Condenser water Condenser air Normal Normal Setting of the thermostat is faulty Correct it Does the fan motor repeat ON OFF operation In case the gas temp and the running current are high Control PCB ass y is faulty Normal operation Does the compressor repeat ON OFF opertion Over current High Measure the running current Measure the gas temperature 90 C 105 C discharge ...

Page 19: ...ned Not blocked Cooling 14 to 18 F Drying 23 to 27 F Clean the filter Set it to HIGH Is the filter blocked Is the fan speed at HIGH Isn t the cooling load excessive Explain the running conditions again using the instruction manual Insufficient refrigerant gas Gas leak No In case of insufficient gas replenishment is according to the gas replenish procedure YES NO YES NO NO YES P l e a s e c l o s e...

Page 20: ...om with high humidity frequently or in case there is no door between the rooms the situ ation becomes the same B Water Leaks Causes 1 There is a moisture generating source in the room Note that even if a ventilation fan is not in operation if it is open to the outside the con dition is same as the one in operation 2 Air volume is remarkably reduced Air filter is blocked resulting in the reduction ...

Page 21: ...if something is fluttering in the wind Air blows in and out at the air discharge port Check if there is an obstacle which hinders the air flow to any extent Check whether the air filter is dirty or not Check whether the evaporator is dirty with dust or oil or not No Clean ...

Page 22: ... 22 11 3 PC Board Layout Top view ...

Page 23: ... 23 Bottom view ...

Page 24: ...e is set with its tip down the water condensed within the hose might leak out of the room It is therefore recom mended to set the hose with its tip kept higher than the air outlet of the air conditioner prop erly 2 Put a seat under each caster 3 Electrical wiring Table 12 2 12 1 Installation Method 1 Insert the connection port round into the air con ditioner surely to its root 1 The exhaust hose m...

Page 25: ...r change the water once every week Fig 12 3 2 The water in tank becomes 50 or so in cooling operation It is abnormal at all 12 5 Relocation of Air Conditioner 1 When you move the air conditioner be sure to drain out the water in tank first and do not lay down the air conditioner Drain hose ...

Page 26: ... 1 3 Open the front door and remove the tank 4 Remove the inner cover screwed down at five spots Fig 13 2 5 Remove two screws fastening the condenser cover one in the front part and another in the rear Fig 13 3 6 Remove the condenser cover by pulling it ob liquely upward then the condenser will be ex posed 7 When assembling follow the reverse procedures Fig 13 4 Inner cover Tank Condenser cover Co...

Page 27: ...69760 Cord Band 251 43068437 Control Panel 253 43009439 H Louver 255 43097200 Tamper Proof Screw 256 43082263 Screw Driver Tamper Proof Screw Location Part Description No No Location Part Description No No 201 43000679 Front Panel 202 43008399 Door Control Panel 203 43003190 Cabinet Back 204 43000680 Cabinet 205 43080332 Air Filter 206 43019800 Handle 207 43000678 Door Front 208 43007917 Magnet Ca...

Page 28: ...d Assembly 407 43031090 Diode Block 408 43034070 Relay Miniature JE X 409 43033197 Capacitor Electrolytic Location Part Description No No Location Part Description No No 410 43055359 Toshiba Nonlinear Resistor 411 43035573 Surge Absorber 412 43031043 TR 2SD880Y 413 43034036 Relay Power 414 43060899 Fuse 415 43055462 Capacitor EEP Series 416 43055284 Toshiba Nonlinear Resistor 417 43055508 Capacito...

Page 29: ...EP Series P06 CN03 RY01 R08 R09 CN02 CN04 WHI C50 P05 6 3A 250V CR01 D06 R73 Q02 C31 C30 R62 R74 R76 R76 R05 J02 C01 D05 RY03 RY02 F01 CN08 CR02 C35 P12 RED J01 P10 R26 SG01 CR03 CN07 C Q01 C06 C05 Q04 Q05 Q06 R10 C08 TC R69 R70 R71 R22 R21 R20 R61 R63 IC01 C22 R60 R59 R58 R57 R92 R93 R94 R95 C32 C29 R72 R02 R01 C03 D02 C04 R64 D01 C02 C26 C28 C23 R65 R80 R81 R82 R83 R84 R85 R66 R67 R68 C36 C35 Q0...

Page 30: ...69761 Wire Saddle 250 43021870 Motor AC 230V 50Hz Fan STF 230 20 4C 254 43039306 Plate Blower Location Part Description No No Location Part Description No No 213 43022394 Casing Up 214 43022395 Casing Low 215 43022396 Case Fan Up 216 43022397 Case Fan Low 217 43020249 Fan Multi Blade 218 43072327 Drain Pan 219 43022392 Case Fan Exhaust 220 43022393 Cover Fan Exhaust 221 43020250 Fan Multi Blade 22...

Page 31: ...Holder Sensor TA 249 43063188 Holder Sensor TC Location Part Description No No Location Part Description No No 231 43041589 Compressor PH94X1 4G1 232 43044543 Evaporator 233 43043523 Condenser 234 43043524 Condenser Air 239 231 249 233 234 232 248 ...

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Page 33: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 01 JAPAN ...