Hitachi RAC-10G5 Service Manual Download Page 48 | Manualshive

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Hitachi RAC-10G5 Service Manual Download Page 48

– 52 –

8. Room Temperature Thermistor Circuit

●

Fig. 8-1 shows the room temperature

thermistor circuit.

9. Heat exchanger temperature thermistor circuit

●

The voltage at

A

depends on the room

temperature as shown in Fig. 8-2.

●

The circuit detects the indoor heat

exchanger temperature and controls
the following.

(1) L o w - t e m p e r a t u r e d e f r o s t i n g

during cooling and dehumidifying
operation.

The voltage at

A

depends on the heat

exchanger temperature as shown in
Fig. 9-2.

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Summary of Contents for RAC-10G5

Page 1: ... AND DIMENSIONAL DIAGRAM 29 MAIN PARTS COMPONENT 31 WIRING DIAGRAM 34 CIRCUIT DIAGRAM 37 PRINTED WIRING BOARD LOCATION DIAGRAM 39 BLOCK DIAGRAM 41 BASIC MODE 43 REFRIGERATING CYCLE DIAGRAM 46 DESCRIPTION OF MAIN CIRCUIT OPERATION 47 AUTO SWING FUNCTION 55 SERVICE CALL Q A 56 PARTS LIST AND DIAGRAM 60 RAS 10G5 RAC 10G5 RAS 14G5 RAC 14G5 COOLING INDOOR UNIT RAS 10G5 780 280 220 9 RAS 10G5 RAS 14G5 O...

Page 2: ...or use in repairs or inspection should 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 in...

Page 3: ...ing 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 1M 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 ...

Page 4: ...he 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 Staple ...

Page 5: ...reset and the unit will begin or stop operating under a new timer setting 4 If the room air conditioner is stopped by adjusting thermostat or missoperation and re start in a moment there is occasion that the cooling 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 f...

Page 6: ...TCH TRANSFORMER VARISTOR FUSE CAPACITY TIME DELAY FUSE THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL RAS 10G5 RAS 14G5 20 W NO NO NO NO NO 3 15A G4A YES YES YES YES SWITCHING POWER SUPPLY 450NR YES IC YES 30 W 2 5µF 450VAC YES 35µF 450 VAC 45µF 450 VAC YES EXTERNAL YES EXTERNAL NO NO NO NO NO NO NO 10 A 15 A NO NO 680g UNIT MAX PIPES REFRIGERANT CHARGING VOLUME Refrigerant R410A RAC 10G5 RAC 14G...

Page 7: ...nit should be kept max 5m The connecting pipe no matter big or small 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 Please use insulated drain hose for the indoor piping commercial product The indoor piping should be insulated with the enclosed insulation pipe If the ...

Page 8: ...nit should be kept max 5m The connecting pipe no matter big or small 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 Please use insulated drain hose for the indoor piping commercial product The indoor piping should be insulated with the enclosed insulation pipe If the ...

Page 9: ...on Refer page 9 HORIZONTAL DEFLECTOR VERTICAL DEFLECTOR AIR OUTLET REMOTE CONTROLLER Send out operation signal to the indoor unit So as to operate the whole unit Refer Instruction manual OUTDOOR UNIT WIDTH mm MODEL RAS 10G5 RAS 14G5 RAC 10G5 RAC 14G5 HEIGHT mm DEPTH mm MODEL NAME AND DIMENSIONS 780 700 280 468 220 258 DRAIN PIPE Condensed water drain to outside CONNECTING CORD AIR INLET BACK LEFT ...

Page 10: ...ODE OPERATION LAMP This lamp lights during operation TIMER LAMP This lamp lights when the timer is working TEMPORARY SWITCH Use this switch to start and stop when the remote controller does not work Use non conductor stick example toothpick By pressing the temporary switch the operation is done in previously set operation mode When the operation is done using the temporary switch after the power s...

Page 11: ...ons of the local Power Supply Companies are to be observed Minimum Maximum Indoor Dry bulb C 21 32 Wet bulb C 15 23 Outdoor Dry bulb C 21 43 Wet bulb C 15 26 Note Avoid to use the room air conditioner for cooling operation when the outside temperature is below 21 C 70 F The recommended maximum and minimum operating temperatures of the hot and cold sides should be as below ...

Page 12: ...ainable at authorized service parts centers W A R N I N G PRECAUTIONS DURING OPERATION Avoid an extended period of direct air flow for your health W A R N I N G Do not insert a finger a rod or other objects into the air outlet or inlet As the fan is rotating at a high speed it will cause injury Before cleaning be sure to stop the operation and turn the breaker OFF During thunder storm disconnect a...

Page 13: ...pability of the unit for example more people entering the room using heating equipments and etc the preset room temperature cannot be achieved This appliance is not intended for use by young children or infirm person unless they have been adequately supervised by a responsible person to ensure that they can use the appliance safely Young children should be supervised to ensure that they do not pla...

Page 14: ...e this button to deliver faster and more comfortable air conditioning STOP button Press this button to stop operation only SLEEP button Use this button to set the sleep timer FAN SPEED selector This determines the fan speed Each time you press this button the intensity of circulation will change from AUTO to HI to MED to LOW AUTO SWING button Controls the angle of the horizontal air deflector TEMP...

Page 15: ... button the display indicates the setting AUTO The FAN SPEED is HI at first and varies to MED or LOW automatically when the preset temperature has been reached HI Hi fan speed mode MED Medium fan speed mode LOW Low fan speed mode Set the desired room temperature with the TEMPERATURE button the display indicates the setting The range of 25 28 C is recommended as the room temperature for cooling If ...

Page 16: ...gardless of the temperature setting The function will stop the indoor unit will stop emitting air as soon as the room temperature becomes lower than the setting temperature You might feel a bit colder in dehumidifying operation As the settings are stored in memory in the remote controller you only have to press the DEHUMIDIFY button next time Set the desired room temperature with the TEMPERATURE b...

Page 17: ...ontrol button to set to the desired temperature As the settings are stored in memory in the remote controller you only have to press the CIRCULATION button next time 3 Press the STOP button to stop operation STOP 1 2 Circulation Function During circulation operation compressor does not run and there is no cooling operation with only indoor fan running When the setting temperature is higher than ro...

Page 18: ... in COOL mode Temperature and fan speed will change to previous setting Air blow sound will be slightly high due to forced operation 1 NOTE 1 OFF TIME setting OFF timer will be a priority over the SUPER COOLING operation time 2 ON TIME setting SUPER COOLING operation will be a priority over the ON timer operation time CANCELLATION of SUPER COOLING Operation Cancel Condition Operation mode after ca...

Page 19: ...n will be displayed on the remote controller The TIMER lamp lights with a beep from the indoor unit Cooling and dehumidifying Explanation of the sleep timer The device will control the FAN SPEED and room temperature automatically so as to be quiet and good for people s health You can set the sleep timer to turn off after 1 2 3 or 7 hours The FAN SPEED and room temperature will be controlled as sho...

Page 20: ... when you press the button OFF Timer Reservation Operation stop at setting time ON TIME setting Select the ON TIMER by pressing the ON Button Setting time will change according to the below sequence ON Timer Reservation Operation will start for setting temperature at setting time The starting time may different depend on the room temperature and set temperature ...

Page 21: ...n mode is switched ADJUSTING THE AIR DEFLECTORS 1 2 Adjustment of the conditioned air to the left and right Hold the vertical air deflector as shown in the figure and adjust the conditioned air to the left or right If the AUTO SWING button is pressed once the horizontal air deflector swings up and down If the button is pressed again the deflector stops in its current position Several seconds about...

Page 22: ...different kinds of batteries together 2 Take out the batteries when you do not use the remote controller for 2 or 3 months 3 Use high quality and high performance AAA batteries to avoid short operating life and electrolyte leakages CAUTION When using the remote control if there is no response from the air conditioner unit and or the remote control has fading and dim displays the batteries in the r...

Page 23: ... volume and the cooling efficiency To prevent from wasting electric energy please clean the filter every 2 weeks Caution Do not close the room for a long period of time Occasionally open the door and windows to allow the entrance of fresh air At night please use the OFF or ON timer operation mode together with your wake up time in the morning This will enable you to enjoy a comfortable room temper...

Page 24: ...e achieved When the indoor unit is not to be used for a long period of time please switch off the power from the mains If the power from mains remains ON the indoor unit still consumes about 8W in the operation control circuit even if it is in OFF mode Warning To protect the whole unit during lightning please stop operating the unit and remove the plug from the socket Interference From Electrical ...

Page 25: ... Cleaning and maintenance must be carried out when filter lamp lights Before cleaning stop operation and switch off the power supply CAUTION CAUTION Do not bend the air purifying filter as it may cause damage to the structure NOTE In case of removing the air purifying filters please follow the above procedures The cooling capacity is slightly weakened and the cooling speed becomes slower when the ...

Page 26: ... bristle brush Allow filters to dry in shade 3 Re insert the air purifying filter to the filter frame Set the pre filter with FRONT mark facing front and slot them into the original state After attaching the pre filters push the front panel at three arrow portions as shown in figure and close it CAUTION Do not wash with hot water at more than 40 C The filter may shrink When washing it shake off mo...

Page 27: ...e to hold the front panel with both hands to detach and attach it CAUTION Do not splash or direct water to the body of the unit when cleaning it as this may cause short circuit Never use hot water above 40 C benzine gasoline acid thinner or a brush because they will damage the plastic surface and the coating Removing the Front Panel When the front panel is fully opened with both hands push the rig...

Page 28: ...nals in your plug proceed as follows The wire which is coloured green and yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol or coloured green or green and yellow The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black The wire which is coloured brown must be connected to the te...

Page 29: ...ht rubbing noise from the fan casing which is cooled and then gradually warmed as operation stops The odor will possibly be emitted from the room air conditioner because the various odor emitted by smoke foodstuffs cosmetics and so on sticks to it So the air filter and the evaporator regularly must be cleaned to reduce the odor Please contact your sales agent immediately if the air conditioner sti...

Page 30: ...e indoor unit and also 50mm or more space is required above the unit 2 Insulated pipes should be used for both the narrow and wide dia pipes 3 Height different of the piping between the indoor unit and the outdoor unit should be kept max 5m 4 Power supply cord length is about 2m 5 Connecting cable 1 5mm dia x 3 AB Line is used for the connection ...

Page 31: ... 30 MODEL RAC 10G5 RAC 14G5 ...

Page 32: ...N 24 INDICATION 32 MODEL RAS 10G5 14G5 THERMOSTAT MODEL IC OPERATION COOL ON 17 3 63 1 OFF 16 7 62 1 ON 25 3 77 5 OFF 24 7 76 5 ON 33 3 91 9 OFF 32 7 90 9 MODEL RAS 10G5 14G5 RAC 10G5 14G5 PHASE RATED VOLTAGE SINGLE RATED FREQUENCY DC35V 220 240V TEMPERATURE C F OUTPUT POLE NUMBER 6 20 W 30W 50 Hz RESISTANCE VALUE 20 C 75 C RM 350 0 RA 195 0 RM 425 6 RA 237 1 ...

Page 33: ...QUENCY 50 Hz LOCKED ROTOR CURRENT 18 A POLE NUMBER 2 COMPRESSOR MOTOR Compressor Motor Specifications CONNECTION 20 C 68 F 75 C 167 F RESISTANCE VALUE RM 3 75 RA 3 34 EXTERNAL OVERLOAD RELAY INTERNAL PROTECTOR YES NO RM 4 56 RA 4 06 RAC 10G5 RAC 10G5 MODEL COMPRESSOR LINE CORD ARRANGEMENT ...

Page 34: ...ENCY 50 Hz LOCKED ROTOR CURRENT 27 A POLE NUMBER 2 COMPRESSOR MOTOR Compressor Motor Specifications CONNECTION 20 C 68 F 75 C 167 F RESISTANCE VALUE RM 3 08 RS 2 81 EXTERNAL OVERLOAD RELAY INTERNAL PROTECTOR YES NO RM 3 75 RS 3 42 RAC 14G5 RAC 14G5 MODEL COMPRESSOR LINE CORD ARRANGEMENT ...

Page 35: ... 34 WIRING DIAGRAM MODEL RAS 10G5A1 ...

Page 36: ... 35 WIRING DIAGRAM MODEL RAS 14G5AC 63CHA1 ...

Page 37: ... 37 CIRCUIT DIAGRAM Remote Control ...

Page 38: ...PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAS 10G5 14G5 RAC 10G5 14G5 39 ...

Page 39: ... 41 BLOCK DIAGRAM MODEL RAS 10G5 14G5 RAC 10G5 14G5 ...

Page 40: ...ey is switched on during OFF timer operation the OFF timer will be canceled No The set temperature after sleep shift in sensor dehumidi cation operation is limited by 16 C Yes Yes Yes automatic Yes Yes Yes Yes Yes Cooling Item Operation switching Temporary switch Service switch Nice temperature reservation Sleep circuit Auto swing direction Filter sign Wireless mode Item Thermostat ON temperature ...

Page 41: ...ing MT 00 60 min OT 00 60 min HT 60 60 min Obtain OT moved up time depending on the temperature difference from the table below 7 NICE TEMPERA TURE reservation Cooling Setting temp Room temp Time min 00 00 02 00 00 02 25 05 00 15 05 25 08 00 30 08 25 11 00 45 11 25 60 The preset temperature value shown above does not include any shift value 2 Compensation 1 The Attained state is monitored and a No...

Page 42: ... 46 REFRIGERANT CYCLE DIAGRAM MODEL RAS 10G5 RAC 10G5 RAS 14G5 RAC 14G5 ...

Page 43: ... 47 DESCRIPTION OF MAIN CIRCUIT OPERATION 1 ON OFF The ON OFF and Timer reserve button and Sleeping function independently Their operations are shown in Fig 1 1 Fig 1 1 Timer operation ...

Page 44: ... DC 5V lines are increased When the voltage of DC 35V lines reaches about 27V ZD201 is turned ON the potential of Q201 s base rises and Q201 is turned ON Since Q201 s collector is set to LO at this time Q202 is turned ON and the reset input of the micro computer is set to Hi The DC 5V line voltage has already become stable at this time and the micro computer starts operation When the power is turn...

Page 45: ... 3 1 Buzzer Circuit Fig 3 2 Buzzer Operation When the buzzer sounds an approx 3 9kHz square signal is output from buzzer output pin 21 of the micro computer After the amplitude of this signal has been set to 12Vp p by a transistor it is applied to the buzzer The piezoelectric element in the buzzer oscillates to generate the buzzer s sound ...

Page 46: ...sconnect switch To protect the compressor wait at least 3 minutes before turning on again The fan speed is MED Does not operate is 12V is not generated in the control circuit When the service switch is used for operation each change switch is overridden Setting the service switch to Cooling turns on the Power relay 5 Receive circuit Infrared signals from the wireless remote controller are received...

Page 47: ... 48 51 of the micro computer Fig 7 2 Micro computer Output Signals As the micro computer s outputs change as shown in Fig 7 2 the core of the auto sweep motor is excited to turn the rotor Table 7 1 shows the rotation angle of horizontal air deflectors Rotation angle per step 0 0879 7 47 Time per step ms 10 850 Horizontal air deflectors motor Deflectors Table 7 1 Auto sweep Motor Rotation ...

Page 48: ...e thermistor circuit The voltage at A depends on the room temperature as shown in Fig 8 2 The circuit detects the indoor heat exchanger temperature and controls the following 1 Low temperature defrosting during cooling and dehumidifying operation The voltage at A depends on the heat exchanger temperature as shown in Fig 9 2 ...

Page 49: ...power supply and controls the fan motor speed Q901 is switched on and off according to the signal at fan PWM output pin 57 to control the voltage which is smoothed by D902 L901 and C901 to drive the fan motor The output voltage is divided by R919 and R920 and is input to divided voltage output pin 8 the micro computer controls the fan PWM output so the output voltage is set to the specified value ...

Page 50: ... 54 ...

Page 51: ...SING AIR DEFLECTOR 1 DOWNWARD 2 UPWARD INITIALIZE 1 DOWNWARD INITIALIZE 1 DOWNWARD 2 UPWARD STOP AT THE MOMENT START SWINGING 1 DOWNWARD 2 UPWARD 3 DOWNWARD STOP AT THE MOMENT START SWINGING 1 DOWNWARD 2 UPWARD 3 DOWNWARD STOP AT THE MOMENT ONE SWING CLOSING AIR DEFLECTOR 1 DOWNWARD 2 UPWARD INITIALIZE AT NEXT OPERATION INITIALIZE AT NEXT OPERATION STOP DURING ONE SWING STOP DURING SWINGING STOP D...

Page 52: ... the actual room temperature is compared with the room temperature setting when starting the operation and the operation is as follows 1 When actual room tempe rature room temperature setting The operation is according to the room temperature setting on the remote controller 2 When actual room tem perature room tempera ture setting Regardless of the room temperature setting the temperature is auto...

Page 53: ...time after changing the time setting A7 In case of ON timer the operation does not start at a preprogrammed time but a little earlier Q8 Nice temperature reservation The Nice temperature reservation functions The operation starts earlier so the room temperature will be as set at a programmed time The operation starts at most 60 minutes before a preprogrammed time A8 The time to start an operation ...

Page 54: ...ntacts 3 Power switch 2 Before checking the varistor detach a terminal NO Operates by setting the service switch to forced cooling Return the service switch to Normal Set the remote controller to an operation status and press the ON OFF button Is the level LO approx 0 5V between driver IC501 pin 10 power relay and 0V NO Is voltage normal between blue wire and red wire of Indoor DC Fan Motor NO YES...

Page 55: ...rce cooling switch at indoor electrical IC 401 Data read wrongly In case that data read from IC401 is wrong IC401 data is not in order Heat exchanger thermistor error Heat exchanger thermistor open or short circuit detected 1 Thermistor 2 Indoor control circuit board Room thermistor error Room thermistor error open or short circuit detected 1 Thermistor 2 Indoor control circuit board 1 2 3 4 5 0 5...

Page 56: ... 60 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAS 10G5 14G5 ...

Page 57: ...10 PMRAS S10CY 005 1 DRAIN PAN ASSY 11 PMRAS 25YH4 929 1 AUTO SWEEP MOTOR 12 PMRAS S10CYT R05 1 SE COVER 13 PMRAS 10G5 R01 1 FRONT COVER ASSY 14 PMRAS 10G5 R02 1 FRONT PANEL 15 PMRAK 25N6 R04 1 AIR FILTER R 16 PMRAK 25N6 R05 1 AIR FILTER L 17 PMRAS 10CE9G 003 1 REMOTE CONTROL ASSEMBLY 18 PMRAS 10C9G 014 1 REMOTE CONTROL SUPPORT 19 PMRAS 10C8M 003 1 THERMISTOR SUPPORT 20 PMRAS 260GHA 001 1 THERMIST...

Page 58: ...0 PMRAS S10CY 005 1 DRAIN PAN ASSY 11 PMRAS 25YH4 929 1 AUTO SWEEP MOTOR 12 PMRAS S10CYT R05 1 SE COVER 13 PMRAS 10G5 R01 1 FRONT COVER ASSY 14 PMRAS 10G5 R02 1 FRONT PANEL 15 PMRAK 25N6 R05 1 AIR FILTER R 16 PMRAK 25N6 R04 1 AIR FILTER L 17 PMRAS 10CE9G 003 1 REMOTE CONTROL ASSEMBLY 18 PMRAS 10C9G 014 1 REMOTE CONTROL SUPPORT 19 PMRAS 10C8M 003 1 THERMISTOR SUPPORT 20 PMRAS 260GHA 001 1 THERMISTO...

Page 59: ... 63 PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL RAC 10G5 14G5 ...

Page 60: ...903 1 FAN MOTOR 8 PMRAC X10CZ S05 1 PROPELLER FAN 9 PMRAC S10CAK S03 1 SIDE PLATE R 10 PMRAC X10CZ S03 1 CONDENSER 11 PMRAC X10CZ S07 1 STRAINER PIPE 12 PMRAC S10CAK S01 1 COMPRESSOR 13 KPNTI 001 6 COMPRESSOR NUT 14 PMRAC 10G5 S01 1 CABINET 15 PMRAC X10CZ S04 1 D GRILL 16 PMRAC E10CZ S07 1 TOP COVER 17 PMRAC X10CZ S14 1 SIDE PLATE L 18 PMRAC S10CAK S05 3 COMPRESSOR RUBBER 19 PMRAC E10CZ S10 1 TERM...

Page 61: ... 903 1 FAN MOTOR 8 PMRAC X10CZ S05 1 PROPELLER FAN 9 PMRAC S10CAK S03 1 SIDE PLATE R 10 PMRAC X10CZ S03 1 CONDENSER 11 PMRAC X10CZ S07 1 STRAINER PIPE 12 PMRAC S13CAK S01 1 COMPRESSOR 13 KPNTI 001 6 COMPRESSOR NUT 14 PMRAC 14G5 S01 1 CABINET 15 PMRAC X10CZ S04 1 D GRILL 16 PMRAC E10CZ S07 1 TOP COVER 17 PMRAC X10CZ S14 1 SIDE PLATE L 18 PMRAC S13CAK S03 3 COMPRESSOR RUBBER 19 PMRAC E10CZ S10 1 TER...

Page 62: ...HITACHI PM NO 0487E Printed in Malaysia RAS 10G5 RAC 10G5 RAS 14G5 RAC 14G5 ...

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