Toshiba RAS-18N3ACV Series Service Manual Download Page 2

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CONTENTS

1. SAFETY PRECAUTIONS .......................................................................... 2

2. SPECIFICATIONS...................................................................................... 4

3. REFRIGERANT R410A .............................................................................

4. CONSTRUCTION VIEWS ........................................................................ 1

5. WIRING DIAGRAM .................................................................................. 1

6. SPECIFICATIONS OF ELECTRICAL PARTS .........................................

7. REFRIGERANT CYCLE DIAGRAM ........................................................

8. CONTROL BLOCK DIAGRAM ................................................................ 2

9. OPERATION DESCRIPTION ................................................................... 2

10. INSTALLATION PROCEDURE ................................................................

11. HOW TO DIAGNOSE THE TROUBLE ......................................................

12. HOW TO REPLACE THE MAIN PARTS ...................................................

13. EXPLODED VIEWS AND PARTS LIST .................................................

FILE NO. SVM-12053

Summary of Contents for RAS-18N3ACV Series

Page 1: ...R410A SERVICE MANUAL AIR CONDITIONER SPLIT TYPE FILE NO SVM 12053 Indoor Unit RAS 18N3KCV POWER SEL SWING FAN FIX QUIET HiPOWER ONE TOUCH COM FOR T SLEE P Sep 2012 Outdoor Unit RAS 18N3ACV ...

Page 2: ...4 5 WIRING DIAGRAM 16 6 SPECIFICATIONS OF ELECTRICAL PARTS 17 7 REFRIGERANT CYCLE DIAGRAM 18 8 CONTROL BLOCK DIAGRAM 20 9 OPERATION DESCRIPTION 22 10 INSTALLATION PROCEDURE 43 11 HOW TO DIAGNOSE THE TROUBLE 58 12 HOW TO REPLACE THE MAIN PARTS 77 13 EXPLODED VIEWS AND PARTS LIST 92 FILE NO SVM 12053 ...

Page 3: ...nd installation tools are different from those used for the conventional refrigerant units Accordingly special tools are required for the new refrigerant R410A units For connecting pipes use new and clean piping materials with high pressure fittings made for R410A only so that water and or dust does not enter Moreover do not use the existing piping because there are some problems with pressure fit...

Page 4: ...d electrician in accordance with the Installa tion Manual Make sure the air conditioner uses an exclusive circuit An insufficient circuit capacity or inappropriate installation may cause fire When wiring use the specified cables and connect the terminals securely to prevent external forces applied to the cable from affecting the terminals Be sure to provide grounding Do not connect ground wires to...

Page 5: ...in rotary type with DC inverter variable speed control Model DA131S1B 31FZ Fan motor output W 43 Air flow rate m3 min 34 2 Piping Type Flare connection connection Indoor unit Liquid side mm 6 35 Gas side mm 12 70 Outdoor unit Liquid side mm 6 35 Gas side mm 12 70 Maximum length m 20 Maximum chargeless length m 15 Maximum height difference m 10 Refrigerant Name of refrigerant R410A Weight kg 1 40 W...

Page 6: ...tio 2 3 Capacity Variation Ratio According to Temperature Capacity Ratio 100 5 0kW Cooling Cooling 0 00 1 00 2 00 3 00 4 00 5 00 6 00 7 00 8 00 9 00 10 00 11 00 12 00 0 10 20 30 40 50 60 70 80 90 100 110 120 Compressor Speed RPS Current A RAS 18N3KCV RAS 18N3ACV Condition Indoor DB27 C WB19 C Indoor Air Flow Volume High Pipe Length 7 5m FILE NO SVM 12053 ...

Page 7: ... in the refrigeration cycle may become abnormally high so that a rupture or personal injury may be caused 5 After completion of installation work check to make sure that there is no refrigeration gas leakage If the refrigerant gas leaks into the room coming into contact with fire in the fan driven heater space heater etc a poisonous gas may occur 6 When an air conditioning system charged with a la...

Page 8: ...ater or dust does not enter the pipe interior that no other oil than lubricating oils used in the installed air water heat pump is used and that refrigerant does not leak When using lubricating oils in the piping processing use such lubricating oils whose water content has been removed When stored be sure to seal the container with an airtight cap or any other cover 1 Flare processing procedures a...

Page 9: ...er diameter mm mm 1 4 6 35 0 8 3 8 9 52 0 8 1 2 12 70 0 8 5 8 15 88 1 0 A mm Flare tool for R22 clutch type 0 to 0 5 0 to 0 5 0 to 0 5 0 to 0 5 Conventional flare tool Clutch type Wing nut type 0 5 to 1 0 1 0 to 1 5 0 5 to 1 0 1 0 to 1 5 0 5 to 1 0 1 5 to 2 0 0 5 to 1 0 1 5 to 2 0 Nominal Outer diameter Thickness diameter mm mm 1 4 6 35 0 8 3 8 9 52 0 8 1 2 12 70 0 8 5 8 15 88 1 0 Dimension mm A B...

Page 10: ... 2 7 shows reference values NOTE When applying oil to the flare surface be sure to use oil designated by the manufacturer If any other oil is used the lubricating oils may deteriorate and cause the compressor to burn out Table 3 2 7 Tightening torque of flare for R410A Reference values Nominal Outer diameter Thickness diameter mm mm 1 4 6 35 0 8 3 8 9 52 0 8 1 2 12 70 0 8 5 8 15 88 1 0 3 4 19 05 1...

Page 11: ...s the tools exclusive for R410A and their interchangeability Tools exclusive for R410A The following tools for R410A are required Tools whose specifications are changed for R410A and their interchangeability Note 1 When flaring is carried out for R410A using the conventional flare tools adjustment of projection margin is necessary For this adjustment a copper pipe gauge etc are necessary Note 2 Ch...

Page 12: ...d the connecting port of the electronic balance and charge liquid refrigerant Indoor unit Outdoor unit Opened Opened Refrigerant cylinder with siphon Check valve Open close valve for charging Electronic balance for refrigerant charging Opened Closed Service port 3 4 Recharging of Refrigerant When it is necessary to recharge refrigerant charge the specified amount of new refrigerant according to th...

Page 13: ... of silver and copper It is used to join iron copper or copper alloy and is relatively expensive though it excels in solderability 2 Phosphor bronze brazing filler Phosphor bronze brazing filler is generally used to join copper or copper alloy 3 Low temperature brazing filler Low temperature brazing filler is generally called solder and is an alloy of tin and lead Since it is weak in adhesive stre...

Page 14: ...a flux which does not contain chlorine 3 When adding water to the flux use water which does not contain chlorine e g distilled water or ion exchange water 4 Remove the flux after brazing 3 5 3 Brazing As brazing work requires sophisticated techniques experiences based upon a theoretical knowledge it must be performed by a person qualified In order to prevent the oxide film from occurring in the pi...

Page 15: ...Grille Inlet 132 150 200 222 200 278 525 Drain hose 0 5m Hanger Hanger Connecting pipe 0 39m Flare 6 35 Flare 12 70 Connecting pipe 0 49m 786 262 5 262 5 235 215 215 235 320 6 5 40 47 85 6 5 40 23 109 215 5 153 5 Hanger Installation plate outline Hanger Hanger Outline of indoor unit For stud bold 6 For stud bold 8 10 Center line 63 Remote controller holder 17 5 149 57 Wireless remote controller 17...

Page 16: ...COVER PV Liquid side Flare 6 35 Ø Flare 12 7 Gas side Service port 2 11 x 14 Long holes For 8 10 anchor bolt Installation dimension Air outlel 100 or more 100 or more 600 or more 600 or more Air intlel Ø Ø Ø Ø6 hole 86 Ø6 hole Ø11x14 hole R15 28 A 320 R5 5 36 108 125 50 137 92 5 4 600 320 90 600 90 275 290 550 Ø 436 Z R15 50 36 2 320 342 69 2 R5 5 x 17L Ushape For 8 10 anchor bolt ...

Page 17: ...BLK BLACK BLU BLUE RED RED GRY GRAY PNK PINK WHI WHITE BRW BROWN ORN ORANGE YEL YELLOW PUR PURPLE COLOR IDENTIFICATION F01 FUSE 25A AC250V From Main Line 4 5 6 8 7 3 2 9 10 4 6 5 8 7 2 3 1 9 10 11 9 2 3 7 8 6 5 4 10 2 1 4 3 1 2 2 4 5 3 1 2 4 5 3 1 2 4 5 3 1 2 4 5 3 1 2 2 1 1 2 2 1 1 1 3 5 1 3 5 2 3 1 2 3 1 4 6 1 3 2 5 8 7 3 1 3 1 1 2 3 WHI YEL YEL YEL YEL WHI BLU BLU BLU BLU BLU BLU BLU BLU Color ...

Page 18: ...Ω at 25 C 4 phase 16 pole DC12V No 1 2 3 4 5 6 7 Parts name Reactor Outdoor fan motor Suction temp sensor TS sensor Discharge temp sensor TD sensor Outside air temp sensor TO sensor Terminal block 5P Compressor Model name CH 69 Z T ICF 140 43 4R Inverter attached Inverter attached Inverter attached DA131S1B 31FZ CAM MD12TCTH 5 Rating L 19mH 10A DC140V 43W 10kΩ 25 C 62kΩ 20 C 10kΩ 25 C 20A AC250V 3...

Page 19: ...onal shape of heat insulator Allowable height difference 10m Allowable pipe length P Pressure measurement Gauge attaching port Vacuum pump connecting port Strainer Pulse Modulating valve at liquid side Compressor DA131S1B 31FZ Outdoor heat exchanger Propeller fan Refrigerant amount 1 40kg OUTDOOR UNIT Accumulater tank TC TA Min 2m Chargeless 15m Charge 20g m 16 to 20m charging of refrigerant 20g p...

Page 20: ...S 1 Measure surface temperature of heat exchanger pipe around center of heat exchaner path U bent Thermistor themometer 2 Connecting piping condition 7 5 m Heat exchanger pipe temp Tempeature condition C Indoor fan mode Outdoor fan mode 66 9 to 12 High High 27 19 35 Standard pressure P MPa 0 9 to 1 1 ...

Page 21: ...an Function Heat Exchanger Sensor Tc Room Temperature Sensor Ta Infrared Rays Signal Receiver and Indication Initializing Circuit Power Supply Circuit Converter D C circuit Noise Filter Clock Frequency Oscillator Circuit MCU Power Supply From Outdoor Unit Serial Signal Transmitter Receiver Serial Signal Communication Operation Command and Information Indoor Unit Control Unit Louver Motor Drive Con...

Page 22: ...nsor Indoor unit send receive circuit Noise Filter MCC5009 PCB PWM synthesis function Input current release control IGBT over current detect control Outdoor fan control High power factor correction control Inverter output frequency control A D converter function PMV control Discharge temp control Signal communication to indoor unit PMV Pulse Motor Valve MCU Micro Controller Unit Outdoor Fan motor ...

Page 23: ... of error 2 Role of outdoor unit controller Receiving the operation command signal Serial signal from the indoor unit controller the outdoor unit performs its role Compressor operation control Operation control of outdoor fan motor P M V control Operations followed to judgment of serial signal from indoor side Detection of inverter input current and current release operation Over current detection...

Page 24: ...on 30 9 Discharge temperature control 30 10 Pulse Modulating valve P M V control 31 11 Self Cleaning function 32 12 Remote A or B selection 34 9 3 Auto Restart Function 9 3 1 How to Set the Auto Restart Function 37 9 3 2 How to Cancel the Auto Restart Function 38 9 3 3 Power Failure During Timer Operation 38 9 4 Remote Control 9 4 1 Remote Controller and its function 39 9 4 2 Operation of remote c...

Page 25: ...contents of remote controller ON OFF Air conditioner Operation select COOL AUTO DRY Temperature setup Air direction Swing Air volume select AUTO LOW LOW MED MED HIGH ON timer setup OFF timer setup Hi POWER Indoor unit control Command signal generating function of indoor unit operation Calculation function temperature calculation Activation compensation function of indoor fan Timer function Indoor ...

Page 26: ...g or Fan only is selected according to difference between the preset temperature and the room temperature at which the automatic operation has started as shown in follow figure The Fan only operation continues unit the room temperature reaches a level at which another mode is selected 1 When reselecting the operation mode the fan speed is controlled by the previous operation mode 4 DRY operation D...

Page 27: ...1 2 When setting the fan speed to AUTO on the remote controller revolution of the fan motor is controlled to the fan speed level shown in Fig 2 and Table 1 according to the setup tempera ture room temperature and heat exchanger temperature Fig 1 Fig 2 Table 1 Indoor fan air flow rate 2 5 Ta C 2 0 1 5 1 0 0 5 Tsc a b c d e M WB 3 4 5 L W6 Air volume AUTO L L M M H W6 L M 2 W9 M H 2 WC Indication Fa...

Page 28: ...ked or not is detected and the operation of air conditioner stops and an alarm is displayed if the fan is locked 4 According to each operation mode by the conditions of outdoor temperature To and compressor revolution the speed of the outdoor fan shown in the table is selected In cooling operation Compressor speed rps To 38 To 28 To To 15 To 5 To 0 5 To 0 5 To 38 During ECO To 28 QUIET and To 15 T...

Page 29: ...c power of the compressor drive circuit does not exceed the specified value 5 Current release control Set temp Ts Room temp Ta Correction of Hz signal Outdoor temp To Setup of current release point Capacity control continues Detection of electromotive force of compressor motor winding Detection of motor speed and rotor position Inverter output change Commutation timing change Change of compressor ...

Page 30: ...mpressor speed is kept FILE NO SVM 12053 Initial setting of storage position Louver Directs downward 37 4 7 Louver control This function controls the air direction of the indoor unit The position is automatically controlled initial setting of The set louver position is stored in memory by the microcomputer The angle of the louver is indicated as the louver closes fully is 0 1 Louver storage positi...

Page 31: ... or more Pi sound is heard and the temporary COOL operation starts 4 If the filter lamp goes on press RESET button to go off the filter lamp and then press RESET button again 5 To stop the temporary operation press the button again FILE NO SVM 12053 9 Discharge temperature control Td value 117 C 112 C 108 C 105 C 98 C Control operation Judges as an error and stops the compressor Reduce the compres...

Page 32: ... control 3 If the discharge temperature was exces sively up adjust the open degree of valve so that it is in the range of set tempera ture Discharge temp control 4 To turn off the compressor while the air conditioner stops by control of the thermostat or by remote controller adjust the open degree of valve to the setup value before stop of the compressor SH Super Heat amount Ts Temperature of suct...

Page 33: ...r to the reception of the stop code 3 After the Self Cleaning operation has been performed for the specified period the unit stops operating Unit now performing cooling or dry operation Press STOP button Only timer indicator lights and Self Cleaning operation starts Time set now elapses Operation stops function During Self Cleaning operations The louver opens slightly The indoor fan operates conti...

Page 34: ...embly 2 To cancel Self Cleaning operation 3 To set Self Cleaning operation Turn the power supply ON Press the RESET button located on the front panel of the indoor unit for more than 3 seconds After 3 seconds the unit beeps three times The Self Cleaning is cancelled Turn the power supply ON Press the RESET button located on the front panel of the indoor unit for more than 3 seconds After 3 seconds...

Page 35: ...At the factory the remote controller selection is set to A on all the indoor units There is no A setting display Setting the remote controller To separate using of remote control for each indoor unit in case of 2 air conditioner are installed nearly Remote Control B Setup 1 Press RESET button on the indoor unit to turn 2 Point the remote control at the indoor unit 3 Push and hold CHK button on the...

Page 36: ...mode or plasma air sending the signal to the unit l Use the tip of the pencil to push the on display them press SET button m Press button to turn the unit ON n When short timer is activated all immediately besides all indicatiors on 3 seconds 35 FILE NO SVM 12053 SWING FAN FIX QUIE T HiPOWER ONE TOUCH COMFORT SLEEP POWER SEL 3 3 1 14 COMFORT The principles of comfort sleep mode are Quietness for m...

Page 37: ...on 4 Fan is controlled as followings Mode is indicated on the display of the remote controller and the unit operates as follows 1 Automatic operation The indoor unit operates in according to the current operation 2 Cooling operation remote controller does not change The indoor unit s fan speed level increase 1 tap The preset temperature drops 1ºC The value of the preset temperature on the 3 The Hi...

Page 38: ...ing accidentally shut down When the unit is stand by Not operating When the unit is in operation Operation Push RESET button for more than three seconds Less than 10 seconds Motions The unit is in operation The green indicator is on The unit stops operating The green indicator is turned off After approx three seconds The unit beeps three times The green indicator flashes for 5 seconds If the unit ...

Page 39: ... time push RESET button once more or use the remote controller to turn it off When the system is operating Operation Push RESET button for more than three seconds Less than 10 seconds Motions The unit is in operation The green indicator is on The unit stops operating The green indicator is turned off After approx three seconds The unit beeps three times If the unit is required to operate at this t...

Page 40: ...emperature Cooling Min 17 C Max 30 C Fan Only No temperature indication 3 Press FAN Select AUTO LOW LOW MED MED or HIGH FILE NO SVM 12053 SWING FAN FIX QUIET Hi POWER ONE TOUCH COMFORT SLEEP 4 6 5 16 14 11 9 10 21 18 19 20 17 8 15 13 7 12 2 3 1 POWER SEL 1 1 1 1 Infrared signal emitter Start Stop button Mode select button MODE 18 Temperature button TEMP 3 4 Fan speed button FAN Swing louver button...

Page 41: ...reset temperature is 24 C and fan operation is automatic speed 8 TIMER OPERATION Setting the ON Timer Setting the OFF Timer Press ON Set the desired ON timer Press OFF Set the desired OFF timer Press SET Set the timer Press SET Set the timer Press CLR Cancel the timer Press CLR Press ON Set the ON timer Press SET Press OFF Set the OFF timer Press SET button during the or mark flashing 1 1 2 3 2 3 ...

Page 42: ... sec for 5 secpmds Do not operate ON timer and OFF timer 2 Press and hold the RESET button on the indoor unit for 3 seconds to cancel the Setting operation 3 beep sound but OPERATION lamp does not blink 11 QUIET OPERATION To operate at super low fan speed for quiet operation except in DRY mode Press QUIET Start and stop the operation Note Under certain conditions QUIET operation may not provide ad...

Page 43: ... The mark is shown when holding down the button for more than 3 seconds while the mark is flashing Press another button to turn off the mark 8 POWER SEL Indicates the selected POWER SEL level 1 7 9 12 4 6 8 3 11 10 2 13 5 4 FAN speed indicator Indicates the selected fan speed AUTO or five fan speed levels LOW LOW MED MED HIGH can be shown Indicates AUTO when the operating mode is either AUTO or Dr...

Page 44: ...right Left Bottom right Rear left Bottom left Insulate the refrigerant pipes separately with insulation not together 8 mm thick heat resisting polyethylene foam 8 Flat head wood screw 3 Batteries 2 Wireless remote control 4 Remote control holder 6 Filter 5 Filter 8 Flat head wood screw 9 Flat head wood screw 10 Battery cover A B C D Vinyl tape Apply after carrying out a drainage test Saddle Extens...

Page 45: ...tlet Drain outlet 600 mm 90 mm 125 mm 108 mm 28 mm 86 mm 102 mm 320 mm 2 5 m m Æ 10 2 Installation 10 2 1 Optional installation parts Fixing bolt arrangement of outdoor unit Part Code A B C Q ty One each 1 One each Parts name Refrigerant piping Liquid side 6 35 mm Gas side 12 70 mm Pipe insulating material polyethylene foam 8 mm thick Putty PVC tapes FILE NO SVM 12053 44 ...

Page 46: ...emote control x 1 Battery x 2 Part name Q ty Remote control holder x 1 Filter x 1 Part No 4 5 6 Part No Others Name Owner s manual Installation manual Part name Q ty 11 Filter x 1 Battery cover x 1 7 8 9 10 Mounting screw 4 x 25 s x 6 Flat head wood screw 3 1 x 16 s x 2 Flat head wood screw 3 1 x 25 s x 1 Screw 4 x 10 s x 2 ...

Page 47: ...ter Gas leakage detector Applicable to R22 model Changes As pressure is high it is impossible to measure by means of conventional gauge In order to prevent any other refrigerant from being charged each port diameter has been changed In order to increase pressure resisting strength hose materials and port size have been changed to 1 2 UNF 20 threads per inch When purchasing a charge hose be sure to...

Page 48: ...of the remote controller should be determined as shown below Fig 10 3 1 10 3 2 Drilling a Hole and Mounting Installation Plate Cutting a hole When install the refrigerant pipes from the rear Fig 10 3 2 1 After determining the pipe hole position on the installation plate ð drill the pipe hole Ø65 mm at a slight downward slant to the outdoor side NOTE When drilling into a wall that contains a metal ...

Page 49: ... air inlet grille Open the air inlet grille upward and pull it toward you 2 Remove the terminal cover and cord clamp 3 Insert the connecting cable according to the local rule into the pipe hole on the wall 4 Take out the connecting cable through the cable slot on the rear panel so that it protrudes about 15 cm from the front 5 Insert the connecting cable fully into the terminal block and secure it...

Page 50: ...ller by sliding down and take it out 2 If batteries are exist please take them out The combination of using wire controller and batteries may cause of batteries explosion 3 Make hole for insert control wire by use screwdriver break the polyester sheet as shown on figure 7 4 Insert control wire from rear side of remote controller as shown on figure 8 5 Fix control wire which arrange as shown on fig...

Page 51: ...anging drain hose For leftward connection bottom leftward connection and rear leftward connection s piping it is necessary to change the drain hose and drain cap How to remove the drain cap Clip the drain cap by needle nose pliers and pull out Fig 10 3 13 C Die cutting front panel slit Changing drain hose Piping preparation Rear right Rear left Bottom left Left Bottom right Right 1 Die cutting fro...

Page 52: ...in 43 mm above the wall surface If the connecting pipes is laid exceding 43 mm above the wall surface the indoor unit may unstably be set on the wall When bending the connecting pipe make sure to use a spring bender so as not to crush the pipe Refer to the table below for the bending radius of each connection pipe Fig 10 3 19 NOTE If the pipe is bent incorrectly the indoor unit may unstably be set...

Page 53: ...ooked on the installation plate For detaching the indoor unit from the installation plate pull the indoor unit toward you while pushing the bottom up at the specified parts Fig 10 3 21 Push Push Fig 10 3 20 50 mm or more Do not rise the drain hose Do not form the drain hose into the waved shape Do not put the drain hose end into water Do not put the drain hose end in the drainage ditch Shield pipe...

Page 54: ... always exposed to strong wind like on the coast or on a high story of a building secure the normal fan operation using a duct or a wind shield 3 Especially in windy areas insall the unit to prevent the admission of wind 4 Installation in the following places may result in trouble Do not install the unit in such places A place full of machine oil A saline place such as the coast A place full of su...

Page 55: ...does not flow backward into pipes of the air conditioner when the pump stops If oil inside of the vacuum pump enters the air 1 Connect the charge hose from the manifold valve to the service port of the packed valve at gas side 2 Connect the charge hose to the port of the vacuum pump 3 Open fully the low pressure side handle of the gauge manifold valve 4 Operate the vacuum pump to start evacuating ...

Page 56: ...ervice Port Cap H17 H19 H22 H30 H14 H17 14 18 N m 1 4 to 1 8 kgf m 33 42 N m 3 3 to 4 2 kgf m 8 12 N m 0 8 to 1 2 kgf m 14 18 N m 1 4 to 1 8 kgf m A H Hexagon wrench is required Service Port Cap Valve Rod Cap CAUTION 10 4 4 Wiring connection 1 Remove the valve cover the electric parts cover and the cord clamp from the oudoor unit 2 Connect the connecting cable to the terminal as identified by the ...

Page 57: ... test Check places for outdoor unit Electric parts cover Check places for indoor unit Flarenut connection 10 5 2 Remote Control A B Selection When two indoor units are installed in the same room or adjacent two rooms if operating a unit two units may receive the remote control signal simultaneously and operate In this case the operation can be preserved by setting either one remote control to B se...

Page 58: ...can restart automatically in the same operating mode as before the power failure The product was shipped with Auto Restart function in the off position Turn it on as required How to set the auto restart 1 Press and hold the RESET button on the indoor unit 3 seconds to set the operation 3 beep sound and OPERATION lamp blink 5 time sec for 5 seconds 2 Press and hold the RESET button on the indoor un...

Page 59: ...ic shock may be caused in case of touching parts on the P C board by hand The inverter will be incorporated starting with this unit The control circuitry has an uninsulated construction Fig 11 1 IGBT 6 FET 6 MCU Compressor Fan motor Shared potential Driver Driver Amplifier Amplifier No 1 2 3 4 5 6 7 8 Troubleshooting Procedure First Confirmation Primary Judgment Judgment by Flashing LED of Indoor ...

Page 60: ...ponents Do NOT lay the circuit board assembly flat Precautions when inspecting the control section of the outdoor unit NOTE A large capacity electrolytic capacitor is used in the outdoor unit controller inverter Therefore if the power supply is turned off charge charging voltage DC280 to 380V remains and discharging takes a lot of time After turning off the power source if touching the charging se...

Page 61: ...en if the room temperature is within range of compressor ON Increasing of compressor motor speed stops approx 30 seconds after operation started and then compressor motor speed increases again approx 30 seconds after In AUTO mode the operation mode is changed Description The OPERATION lamp of the indoor unit flashes when power source is turned on If button is operated once flashing stops Flashes a...

Page 62: ...played when air conditioner operates 2 When item B and C and item B and a part of item E occur concurrently priority is given to the block of item B 3 The check codes can be confirmed on the remote controller for servicing OPERATION Green Flashing display 1 Hz OPERATION Green TIMER Yellow FILTER Orange Flashing display 5 Hz OPERATION Green FILTER Orange Flashing display 5 Hz OPERATION Green TIMER ...

Page 63: ... there is no fault with a code the indoor unit will beep once Beep and the display of the remote controller will change as follows The TIMER indicator of the indoor unit flashes continuously 5 times per 1 sec Check the unit with all 52 check codes to as shown in Table 11 4 1 Press ON or OFF button to change the check code backward If there is a fault the indoor unit will beep for 10 seconds Beep B...

Page 64: ...m errors The lamp on the indoor unit blinks when error is defected The lamp on the indoor unit blinks when error is defected The lamp on the indoor unit blinks when error is defected And it returns to the normal condition when recovering from errors The lamp on the indoor unit blinks when error is defected The lamp on the indoor unit blinks when error is detected 1 Check the indoor thermo sensor T...

Page 65: ...l transmitted properly Item by symptoms Operation Check Item Considerable principle cause Measures Parts R01 C01 C02 R64 C27 DB01 Remote controller is defective Refer to 5 Troubleshooting for remote controller Parts of a power supply circuit defective Unit operates normally Replace main P C board Is fuse F01 of indoor control board blown NO NO NO NO YES YES YES YES YES T01 are defective Microcontr...

Page 66: ...cross flow fan by hand at the operation stop condition is the rotation signai DC 12V 0V detected between 2 Purple lead and 3 Blue lead of the motor connector CN33 1 pulse 1 revolution Dose AC120V or higher voltage apply to between red and black lead of the motor Is it possible to change airflow level to HIGH Stop the operation Does fan motor continue to operate Does indoor fan operate Fan motor op...

Page 67: ...e cover of the fan motor lead wires 3 Check DC voltage with CN31 connector while the fan motor is rotating NOTE Do not disconnect the connector while the fan motor is rotating Use a thin test rod Indoor fan starts rotating when power supply is turned on Check output DC voltage of fan motor on P C board Measure voltage between 3 GND BLACK and 5 V line YELLOW of motor connector CN31 while indoor fan...

Page 68: ...affected by remote controller when a signal is transmitted at distance of 5 cm from radio Is transmission mark indicated P C board is defective Replace batteries Replace remote controller Normal operation Remote controller is defective NO YES NO YES NO YES NO YES NO YES NO YES NO YES Does indoor unit start to operate by automatic restart function Push the button Does indoor unit beep and operate R...

Page 69: ...tdoor unit stops in a little while after operation started Check procedure Select phenomena described below 1 If the unit stops once it does not operate until the power will be turned on again 2 The outdoor unit stops 10 minutes to 1 hour after operation started and an alarm is displayed Discharge temp error check code 03 1E Sensor temp error check code 02 1C Red White Terminal block S5277G Tester...

Page 70: ...und hitting to stopper heard from valve when the air conditioner starts the operation after turning off power of the air conditioner once Are temp sensors of indoor outdoor units correctly set to the holder NOTE The temperature sensors which are used to control pulse motor valve include indoor heat exchanger sensor TC outdoor heat exchanger temp sensor TE outdoor suction temp sensor TS and outdoor...

Page 71: ...ressor Check whether 25A fuse on the control board assembly is blown or not F01 Turn on the power breaker and operate the air condi tioner in COOL mode by time shortening Measure terminal voltage of the electrolytic capacity 500µF 400V 3 760µF 400V 3 After operation turn off the power breaker after 2 minutes 20 seconds passed and discharge the electrolytic capacitor by soldering iron Check voltage...

Page 72: ...or control circuit CPU and peripheral circuits buzzer and Driving circuit of louver b Indication unit of infrared ray receiving infrared ray receiving circuit LED To check defect of the P C board follow the procedure described below NG OK B A Replace control board assembly Replace control board Replace compressor Check compressor winding resistance Diagnosis Process flowchart Item Check Operation ...

Page 73: ... 1 Between CN51 and No 1 of CN01 DC 15 60V Check whether or not all indicators OPERATION TIMER FILTER are lit for 3 seconds and they return to normal 3 seconds later 1 Check whether or not the com pressor operates 2 Check whether or not the OP ERATION indicator flashes 1 Check it is impossible to detect the voltage AC120V or higher voltage between red and black 2 The motor does not operate or the ...

Page 74: ...0 0 0 10 20 30 40 50 Resistance value k Temperature C TD Discharge temp sensor TA Room temp sensor TC Heat exchanger temp sensor TO Outdoor temp sensor TS Suction temp sensor TA TC TO TS TD 1 Sensor characteristic table 73 FILE NO SVM 12053 12V GND 5V 12V ...

Page 75: ...re the resistance value of winding by using the tester Under 20 C Measure the resistance value of winding by using the tester Under 20 C 4 Part name Outdoor temperature sensor TO discharge temperature sensor TD suction temperature sensor TS Checking procedure Disconnect the connector and measure resistance value with the tester Normal temperature Temperature Sensor TD kΩ TO TS kΩ 10 C 20 C 25 C 30...

Page 76: ...electrolytic liquid does not blow off 6 Check that the normal charging characteristics are shown in continuity test by the tester Case that product is good Pointer swings once and returns slowly When performing test once again under another polarity the pointer should return C12 C13 C14 500µF 400V or 760µF 400V 1 Turn OFF the power supply breaker 2 Completely discharge the four electrolytic capaci...

Page 77: ...f the outdoor fan motor 4 Motor drive circuit failure of the outdoor P C board 3 How to simply judge whether outdoor fan motor is good or bad NOTE However GND circuit error inside of the motor may be accepted in some cases when the above check is performed When the fan motor does not become normal even if P C board is replaced replace the outdoor fan motor If the resistance value between 1 Red lea...

Page 78: ...shed they may ignite any oil mixed with the refrigerant gas 2 Do not use welding equipment in an airtight room Carbon monoxide poisoning may result if the room is not properly ventilated 3 Do not bring welding equipment near flammable objects Flames from the equipment may cause the flammable objects to catch fire If keeping the power on is absolutely unavoidable while doing a job such as inspectin...

Page 79: ...pcs 6 Take off four hooks of panel from rear side How to assemble the front panel 1 Press three center positions and two lower center positions of the air outlet and then hang the hanging hooks 4 pcs at the top side of the front panel to the rear plate 2 Tighten four screws Incomplete hanging or incomplete pressing may cause a dewdrops or generation of a fluttering sound 2 Screws Three hooks 4 Scr...

Page 80: ...ads once at the bottom 4 Disengage the display unit by simply pushing at the top of the display unit 5 Remove the fixing screw that secures the conduit mount electric parts box assembly LED assembly and remove the assembly Electric art box cover s screw TC sensor Earth Screw Fan motor connector Louver motor connector Fixing screw LED assembly Fixing screw Loof the qrunding wire p FILE NO SVM 12053...

Page 81: ...ther shafts while sliding the horizontal louver leftward Evaporator Heat exchanger 1 Follow to the procedure in the item 2 Remove the pipe holder from the rear side of the main unit Figure 1 3 Remove two fixing screws at the left side of the end plate of the heat exchanger Remarks Screw Screw FILE NO SVM 12053 Figure 1 Figure 2 Figure 3 Pipe hoolder ...

Page 82: ...ring is out from the housing push it into the specified position and then incorporate it in the main body Bearing Bearing base Two screws Bearing Bearing base FILE NO SVM 12053 One screw One screw 4 Remove three fixing screw at the right side of the heat exchanger and separate the heat exchanger from the back body Bearing Evaporator Heat exchanger Figure 5 Figure 4 5 Figure 4 n o ...

Page 83: ...ew of the cross flow fan 3 Remove two fixing screws of the motor cover and them remove the motor cover 4 Remove two more fixing screws of the motor band and remove the motor band Remarks 5 Pull the fan motor outward Set screw Two screws on motor band Two screws on motor cover FILE NO SVM 12053 p ...

Page 84: ...e main unit Holding the set screw install the cross flow fan so that flat area on shaft of the fan motor comes to the mounting hole of the set screw q FILE NO SVM 12053 Perform positioning of the fan motor as follows When assembling the fan motor the fan motor must be installed in such a way that the fan motor leads will be taken out is positioned at the bottom front After assembling the two hooki...

Page 85: ...e the indoor unit 2 Attach the upper cabinet ST1TØ4 10L 5 pcs 3 Perform cabling of connecting cable and attach the cord clamp Fix the cord clamp by tightening the screws ST2T 4 x 14L 3 pcs fitting 2 concave parts of the cord clamp to each connecting cables 4 Attach the valve cover ST1T 4 x 10L 2 pcs Insert the upper part into the square hole of the side cabinet set hook claws of the valve cover to...

Page 86: ...t is fitted into the side cabinet left at the front left side so pull up the top of the front cabinet to remove it 2 Attachment 1 Insert the claw on the front left side into the side cabinet left 2 Hook the bottom part of the front right side onto the concave section of the bottom plate Insert the claw of the side cabinet right into the square hole in the front cabinet 3 Return the screws that wer...

Page 87: ... This capacitor is one with mass capacity Therefore it is dangerous that a large spark generates if short circuiting between Requirement As each connector has a lock mecha nism avoid to remove the connector by holding the lead wire but by holding the connector Discharging position Discharging period 10 seconds or more Plug of soldering iron The connector is one with lock so remove it while pushing...

Page 88: ...must be released before they are disconnected 2 Remove the control board assembly from the P C board base Remove the heat sink and control board assembly while keeping them screwed together NOTE Disengage the four claws of the P C board base hold the heat sink and lift to remove it 3 Remove the two fixing screws used to secure the heat sink and control board assembly 4 Mount the new control board ...

Page 89: ...d heat exchanger Remarks Detail A Detail B Detail C 1 Perform work of item 1 of and 2 Remove the flange nut fixing the fan motor and the propeller Flange nut is loosened by turning clock wise To tighten the flange nut turn counterclockwise 3 Remove the propeller fan 4 Disconnect the connector for fan motor from the inverter 5 Remove the fixing screws 4 pcs holding by hands so that the fan motor do...

Page 90: ...the terminal 6 Remove pipe connected to the compressor with a burner Remarks Reactor 1 Perform work of item 1 of and 2 Remove screws fixing the reactors ST1TØ4 10L 2 pcs FILE NO SVM 12053 7 Remove the fixing screw of the bottom plate and heat exchanger ST1TØ4 10L 1 pc 8 Remove the fixing screw of the bottom plate and valve fixing plate ST1TØ4 10L 1 pc 9 Pull upward the refrigeration cycle 10 Remov...

Page 91: ...t out of shape 1 Detachment 1 Perform work of item 1 of 2 2 Remove the front cabinet and put it down so that fan guard side directs downward Perform work on a corrugated cardboard cloth etc to prevent flaw to the product 3 Remove the hooking claws by pushing minus screwdriver according to the arrow mark in the right figure and remove the fan guard 2 Attachment 1 Insert claws of the fan guard in th...

Page 92: ...ly and trouble will result if the sensors have not been installed in their proper positions TS sensor Suction pipe temperature sensor Attachment Install the senser onto the straight pipe part of the suction pipe Be careful for the lead direction of the sensor TD sensor Discharge pipe temperature sensor Attachment With its leads pointed upward install the sensor onto the vertical straight pipe part...

Page 93: ...BAND 204 43T80331 FILTER AIR RIGHT DOWN ASSY 205 43T09040 LOUVER HORIZONTAL 215 43T44030 EVAPORATOR ASSY 206 43T70313 HOSE DRAIN 216 43T19333 HOLDER SENSOR 207 43T79313 CAP DRAIN 217 43T49010 PIPE SHIELD 208 43T21360 MOTOR FAN 218 43T82008 PLATE INSTALLATION 209 43T20016 FAN ASSY CROSS FLOW 219 43T49043 HOLDER PIPE 210 43T39021 BASE BEARING 220 43T62031 COVER TERMINAL 211 43T22312 BEARING ASSY MOL...

Page 94: ...Part No No No No 401 43T50324 SENSOR HEAT EXCHANGER 405 43T6V316 PC BOARD ASSY WRS LED 402 43T60331 TERMINAL 3P 407 43T69833 PC BOARD ASSY 403 43T69320 TEMPERATURE SENSOR 412 43T21434 STEPPING MOTOR 404 43T62003 CORD CLAMP 413 43T60386 MOTOR CORD Description Description ...

Page 95: ...MOTOR 6 43T19348 PACKED VALVE COVER 23 43T47001 NUT FLANGE 8 43T41446 COMPRESSOR 24 43T97001 NUT 9 43T43444 CONDENSER ASSEMBLY 25 43T49335 RUBBER CUSHION 10 43T46354 VALVE PACKED 6 35 DIA 28 43T63319 HOLDER SENSOR 11 43T46355 VALVE PACKED 12 7 DIA H4 30 43T39333 MOTOR BASE CONNECTION PLATE 12 43T47331 BONNET 6 35 DIA 32 43T63317 HOLDER SENSOR 13 43T47333 BONNET 12 70 DIA 33 43T63323 HOLDER SENSOR ...

Page 96: ...3 Location Part Location Part No No No No 701 43T62320 HEATSINK 705 43T60377 TEMPERATURE SENSOR 702 43T69944 PC BOARD 706 43T50304 SENSOR HEAT EXCHANGER 703 43T60392 TERMINAL 5P 707 43T62313 BASE PLATE PC 704 43T60326 FUSE Description Description ...

Page 97: ...TOSHIBA CARRIER THAILAND CO LTD ...

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Toshiba RAS-18N3ACV Series, Service Manual

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