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Hitachi RAM-36NP2A Service Manual Download Page 71

– 82 –

Remarks:
When this unit were mean to be connected to mul

Ɵ

 outdoor unit system, below diagnosis table shall be use.

If LD301 lit and at the same 

Ɵ

me LD302 blinks in a number of 

Ɵ

mes, this indicates thermistor faulty.

TIMER

LAMP

BLINKING

LD302

BLINKING

WIRELESS

REMOCON

CODE

WIRED

REMOCON

CODE

MEANING

DETAILS

MAIN CHECK POINT

4 

Ɵ

mes

1 

Ɵ

me

071

01

OVERHEAT THERMISTOR

4 

Ɵ

mes

2 

Ɵ

mes

072

01

DEFROST THERMISTOR

4 

Ɵ

mes

3 

Ɵ

mes

073

01

OUTDOOR TEMPERATURE THERMISTOR

4 

Ɵ

mes

4 

Ɵ

mes

074

01

NARROW PIPE THERMISTOR

(INDOOR NO.1)

4 

Ɵ

mes

5 

Ɵ

mes

075

01

WIDE PIPE THERMISTOR

(INDOOR NO.1)

4 

Ɵ

mes

6 

Ɵ

mes

076

01

NARROW PIPE THERMISTOR

(INDOOR NO.2)

4 

Ɵ

mes

7 

Ɵ

mes

077

01

WIDE PIPE THERMISTOR

(INDOOR NO.2)

4 

Ɵ

mes

8 

Ɵ

mes

078

01

NARROW PIPE THERMISTOR

(INDOOR NO.3)

4 

Ɵ

mes

9 

Ɵ

mes

079

01

WIDE PIPE THERMISTOR

(INDOOR NO.3)

4 

Ɵ

mes

10 

Ɵ

mes

080

01

NARROW PIPE THERMISTOR

(INDOOR NO.4)

4 

Ɵ

mes

11 

Ɵ

mes

081

01

WIDE PIPE THERMISTOR

(INDOOR NO.4)

4 

Ɵ

mes

12 

Ɵ

mes

082

01

NARROW PIPE THERMISTOR

(INDOOR NO.5)

4 

Ɵ

mes

13 

Ɵ

mes

083

01

WIDE PIPE THERMISTOR

(INDOOR NO.5)

If LD304 blinks, the number of blinks indicates a communica

Ɵ

on error with the corresponding indoor unit connec

Ɵ

on.

Detail as per below table.

TIMER

LAMP

BLINKING

LD304

BLINKING

WIRELESS

REMOCON

CODE

WIRED

REMOCON

CODE

MEANING

DETAILS

MAIN CHECK POINT

-

1 

Ɵ

me

COMMUNICATION ERROR BETWEEN OUTDOOR AND 

INDOOR UNIT NO.1

-

2 

Ɵ

mes

COMMUNICATION ERROR BETWEEN OUTDOOR AND 

INDOOR UNIT NO.2

-

3 

Ɵ

mes

COMMUNICATION ERROR BETWEEN OUTDOOR AND 

INDOOR UNIT NO.3

-

4 

Ɵ

mes

COMMUNICATION ERROR BETWEEN OUTDOOR AND 

INDOOR UNIT NO.4

Note : This communica

Ɵ

on error diagnosis table only applicable for 2 rooms un

Ɵ

l 4 rooms mul

Ɵ

 system model.  

            Other shall refer to diagnosis table on the electrical cover or inside outdoor service manual.

THERMISTOR IS OPENED OR SHORTED

1. THERMISTOR
2. CONNECTION OF THERMISTOR IS FAULTY
3. THERMISTOR CIRCUIT

OUTDOOR

OUTDOOR

009

01

EVEN WHEN INDOOR UNIT IS NOT 
CONNECTED, IT BLINKS SIMILARLY.
(NOT MALFUNCTION)

1. INDOOR TO OUTDOOR  C-D LINE CABLE 
NOT CONNECTED PROPERLY.
2. COMMUNICATION CIRCUIT DAMAGED.
3. DC35V POWER SUPPLY DAMAGED.
4. EFFECT OF EXTERNAL NOISE TO C-D LINE 
CABLE.

Summary of Contents for RAM-36NP2A

Page 1: ...4 HOW TO USE 6 CONSTRUCTION AND DIMENSIONAL DIAGRAM 41 MAIN PARTS COMPONENT 42 WIRING DIAGRAM 43 CIRCUIT DIAGRAM 45 BLOCK DIAGRAM 49 BASIC MODE 51 REFRIGERATING CYCLE DIAGRAM 69 AUTO SWING FUNCTION 71 DESCRIPTION OF MAIN CIRCUIT OPERATION 72 SERVICE CALL Q A 76 TROUBLE SHOOTING 79 PARTS LIST AND DIAGRAM 91 RAI 25RPA RAI 35RPA RAI 50RPA COOLING HEATING INDOOR UNIT 1 PHASE 50 Hz 220 240V RAI 50RPA N...

Page 2: ...se 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 insula...

Page 3: ... 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 ear...

Page 4: ...e 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 2...

Page 5: ...ion 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 outside temperature is below 10 C 50...

Page 6: ...or MICROPROCESSOR POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL RAI 25RPA RAI 35RPA RAI 50RPA WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNIT PIPES REFRIGERANT CHARGING VOLUME Refrigerant 410A 4 25W NO NO NO NO NO NO NO NO YES NO NO NO NO YES IC YES ...

Page 7: ...D LEVEL INDOOR AIR FLOW VOLUME Hi SOUND LEVEL INDOOR AIR FLOW VOLUME Hi W H D INSTALLED W H D cu ft COOLING HEATING CEILING CASSETTE RAI 25RPA RAI 35RPA RAI 50RPA 1ø 220 240V 50Hz 35 39 43 8 5 m3 min 10 8 m3 min 12 0 m3 min 36 40 43 8 5 m3 min 10 8 m3 min 12 0 m3 min YES YES YES 4 4 4 NOT PROVIDED POWER CORD SHOULD BE PREPARED AND CONNECTED TO OUTDOOR UNIT WHEN INSTALLED YES WIRELESS YES WIRELESS ...

Page 8: ... operate the unit under abnormal situation Please contact your agent for maintenance Improper self maintenance may cause electric shock and fire Please contact your agent if you need to remove and reinstall the unit Electric shock or fire may occur if you remove and reinstall the unit yourself improperly If the supply cord is damaged it must be replaced by the special cord obtainable at authorized...

Page 9: ... room humidity is always above 80 and with the air deflector facing down or moving automatically for a long period of time water will condense on the air deflector and drips down occasionally This will wet your furniture Therefore do not operate under such condition for a long time If the amount of heat in the room is above the cooling or heating capability of the unit for example more people ente...

Page 10: ...f refrigerant flow may be heard from a stopped indoor unit or a stopped indoor unit may become warm This is because the indoor unit returns refrigerant to the outdoor unit to be ready for operation Adjusting the Number of Indoor Units Decrease the number of indoor units to be operated especially when it is very hot or cold or when you want to reach the present temperature quickly When operation mo...

Page 11: ...device is operated for a total of about 200 hours the FILTER lamp lights to indicate that it is time to clean the filter The lamp goes out when the AUTO SWING button is pressed while the device is on STANDBY MODE 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 don...

Page 12: ...ng should be as below Cooling Heating Minimum Maximum Minimum Maximum Indoor Dry bulb C 21 32 20 27 Wet bulb C 15 23 12 19 Outdoor Dry bulb C 21 43 2 21 Wet bulb C 15 26 1 15 CIRCUIT BREAKER When you do not use the room air conditioner set the circuit breaker to OFF ...

Page 13: ...with your wake up time in the morning This will enable you to enjoy a comfortable room temperature Please use the timer effectively Dusty air filter will reduce the air volume and the cooling efficiency To prevent from wasting electric energy please clean the filter every 2 weeks Please pay attention to the room temperature and air flow direction when operating the unit for baby children and old f...

Page 14: ...e 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 12W 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 Products Caution To avoid noise interferen...

Page 15: ...nstall the filter Set it with UP SIDE mark facing front Slot the filter to suction grille and close as original state Press the mark PUSH at the left and right sides of the suction grille to fix it securely CAUTION Do not wash with hot water at more than 40 C The filter may shrink When washing it shake off moisture completely and dry it in the shade do not expose it directly to the sun The filter ...

Page 16: ... soft dry cloth When it is excessively dirty wipe with soft cloth soaked in lukewarm water or neutral detergent Then wipe thoroughly with a soft dry cloth 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 3...

Page 17: ... 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 still fails to operate normally after the above inspections Inform your agent of the model of your unit production number d...

Page 18: ... if the remote controller display begins to fade and degradation of reception performance occurs within a year replace both batteries with new size AAA LR03 alkaline The attached batteries are provided for the initial use of the system The usable period of the batteries may be short depending on the manufactured date of the air conditioner Notes on the remote controller Never expose the remote con...

Page 19: ...s RESET button 2 Direct remote controller towards indoor unit and press INFO button 3 The calendar and clock from indoor unit will be transmitted Calendar and clock will not be transmitted from indoor unit when the following occurs When there is a power failure When breaker is OFF by user unit is not in STANDBY MODE NOTE Note on setting the calendar and clock If the calendar and clock are not set ...

Page 20: ...n pressing any button the LCD will turn on The LCD will not turn off during TIMER setting Signal Transmitting Receiving Window Point this window towards the indoor unit when controlling it Sensor A temperature sensor inside the remote controller senses ambient temperature around the remote controller Display This indicates the room temperature selected current time timer status function and airflo...

Page 21: ... p 25 INFORMATION Button p 39 ONE TOUCH CLEAN Button p 29 ON OFF TIMER setting Buttons p 30 MODE selector Button Use this button to select the operating mode Every time you press this button the mode will change from AUTO HEAT DEHUMIDIFY COOL and FAN cyclically SILENT Button Use this button to set the SILENT mode p 26 AUTO SWING Vertical Button Controls the angle of the horizontal air deflector p ...

Page 22: ...vailable when Timer or Sleep Timer mode is set As the settings are stored in the memory of the remote controller you only have to press the START STOP button next time Press the MODE selector button so that the display indicates the AUTO mode of operation When AUTO has been selected the device will automatically determine the mode of operation HEAT or COOL depending on the current room temperature...

Page 23: ...peration As the settings are stored in the memory of the remote controller you only have to press the START STOP button next time During AUTO fan the fan speed automatically changes as below When the difference between room temperature and setting temperature is large fan starts to run at HI speed After room temperature reaches the preset temperature fan speed will be changed to lower speed to obt...

Page 24: ...itions Set the desired room temperature with the ROOM TEMPERATURE setting buttons the display indicates the setting The range of 20 26 C is recommended as the room temperature for dehumidifying Press the START STOP button Dehumidifying operation starts with a beep Press the button again to stop operation As the settings are stored in the memory of the remote controller you only have to press the S...

Page 25: ...mperature fan speed will be changed to lower speed to obtain optimum room temperature condition for natural healthy cooling START STOP 1 2 3 Set the desired FAN SPEED with the FAN SPEED button the display indicates the setting AUTO HIGH MED SILENT LOW Set the desired room temperature with the TEMPERATURE buttons the display indicates the setting The temperature setting and the actual room temperat...

Page 26: ...ith a beep Press the button again to stop operation To start Vertical Auto Swing To cancel Vertical Auto Swing Press AUTO SWING VERTICAL button The deflector s will start to swing up and down is displayed on the LCD Press AUTO SWING VERTICAL button again The deflector s will stop in the current position disappeared from the LCD NOTE During cooling and dehumidifying operation do not keep the deflec...

Page 27: ...es with the previous settings used before POWERFUL operation Press the START STOP button Or Press POWERFUL button again POWERFUL operation stops disappears from the LCD 1 NOTE When SLEEP mode ECO mode SILENT mode or LEAVE HOME mode is selected POWERFUL operation is cancelled During POWERFUL operation capacity of the air conditioner will not increase if the air conditioner is already running at max...

Page 28: ...Press SILENT button again or FAN SPEED button Fan speed will return to previous fan speed before SILENT operation starts SILENT operation stops disappears from the LCD 1 NOTE When POWERFUL operation is selected SILENT operation is cancelled Fan speed will return to previous fan speed before SILENT operation After auto restart SILENT operation is cancelled Fan speed will return to previous fan spee...

Page 29: ...changing the set temperature higher or lower automatically and reducing operation power consumption This function may vary based on the connected outdoor unit Press START STOP button Or Press ECO button again disappears from the LCD NOTE ECO function will not be effective when power consumption is low By pressing POWERFUL button ECO operation is cancelled After auto restart ECO operation is cancel...

Page 30: ...T STOP button Or Press LEAVE HOME button again Return to previous operation mode Or Change to other operation mode by pressing MODE button NOTE After reaching the set number of operation days for Leave Home or by pressing the Leave Home button again the unit will operate in previous mode During Leave Home operation fan speed and horizontal air deflector position cannot be changed By pressing Leave...

Page 31: ... START STOP button Or Press CLEAN button again 1 NOTE When CLEAN operation finish unit will switch OFF automatically If Weekly Timer or Once Timer is set there is a need to cancel those timer before operating CLEAN function For multi connections when pressing CLEAN button operation is limited to FAN operation For multi connections when one room operates CLEAN operation first other rooms can operat...

Page 32: ...uence of switching operations 1 Press OFF TIMER button so that and blink on the display 2 Set the turn off time with TIME button After setting direct the remote controller towards the indoor and press SEND button 3 Press ON TIMER button so that and set turn off time light up The and blink 4 Set the turn on time with TIME button 5 After setting direct the remote controller towards the indoor and pr...

Page 33: ...from indoor unit and the TIMER lamp on the indoor unit lights up Pressing SLEEP button repeatedly the number of hours will change as below During ECO SLEEP TIMER operation air conditioner will continue to operate for the designated number of hours and then turn off When the ECO SLEEP TIMER has been set the display on the remote controller indicates the turn off time Press START STOP button Room ai...

Page 34: ...our after setting ECO SLEEP TIMER set temperature will be slightly shifted Amount of temperature shifted depends on type of air conditioner These automatic operation changes contribute to energy saving without losing comfort The level of energy consumption depends on outside temperature room temperature set temperature or air conditioner type Cooling operation diagram representation for illustrati...

Page 35: ...hanged day Mon program no 1 ON OFF setting time and setting temperature blink on the display 3 Select the desired day of the week Press DAY button The day changes from Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat Sun Full days Mon Tue Wed Thu Fri weekday Sat Sun weekend Mon Tue Select Full days for daily reservation Select weekday for Monday to Friday reservation Select weekend for Saturday...

Page 36: ...en completed The reservation contents will appear on the remote controller display If TIMER lamp on the indoor unit does not light up press SEND button while directing the remote controller towards the indoor unit for about 3 seconds CAUTION Do not press CANCEL button during reservation setting because this will result in all reservation contents to be lost The reservation contents will not stored...

Page 37: ...ds the indoor unit and press CANCEL button Beep sound will be emitted from indoor unit and TIMER lamp will be OFF Reservation indication on remote display will also disappear This indicates that non active WEEKLY TIMER has been confirmed To activate back the setting of WEEKLY TIMER repeat the steps for How to select Mode A or Mode B of WEEKLY TIMER setting NOTE When setting ONCE TIMER operation of...

Page 38: ...on one more time to paste only blinks on the display 7 To continue copying to other days press or or or Then start from step 3 8 After copy and paste completed press SEND button while directing the remote controller towards the indoor unit for about 3 seconds Timer lamp on the indoor unit will blink rapidly After beep sound emitted from indoor unit TIMER lamp will light up Please ensure that the T...

Page 39: ... Press to select program number Selected program number will blink 5 Press DELETE button Reservation of selected program number is deleted 6 After deleting press SEND button while directing the remote controller towards the indoor unit for about 3 seconds Timer lamp on the indoor unit will blink rapidly After beep sound emitted from indoor unit TIMER lamp will light up Please ensure that the TIMER...

Page 40: ...indoor unit will blink rapidly After beep sound emitted from indoor unit TIMER lamp will light up Please ensure that the TIMER lamp lights up Reservation will not change if SEND button is not pressed 1 1 2 NOTE If all reservations in the remote controller were deleted and pressed SEND button no signal will be transmitted to indoor unit TIMER lamp will remain off and no changes will be done to the ...

Page 41: ...O button Wait for 2 seconds for signal transmission While temperature around remote controller is displayed press INFO button repeatedly The display will show as below this month power consumption amount for heating last month power consumption amount for heating this month power consumption amount for cooling last month power consumption amount for cooling temperature around remote controller thi...

Page 42: ...will remain This indicates that COOLING and DEHUMIDIFYING mode operation is locked When pressing MODE button or will be displayed Method to unlock COOLING and DEHUMIDIFYING modes including FAN operations Press ECO and SILENT buttons simultaneously for about 5 seconds when the remote controller is OFF All operation mode symbols will appear on the display for about 10 seconds After that operation mo...

Page 43: ...ipes should be used for both the narrow and wide dia pipes 2 Piping length is within 20m 3 Height difference of the piping between the indoor unit and the outdoor unit should be within 10m 4 An F cable 1 6mm or 2 0mm dia X 3 control side is used for the connection cable LUHOHVV UHPRWH FRQWUROOHU ...

Page 44: ...25W Control circuit built in BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GREEN RED RED BLK BLACK PNK PINK VIO VIOLET IC COOL HEAT RAI 25RPA RAI 35RPA RAI 50RPA RAI 50RPA RAI 35RPA RAI 25RPA ON OFF ON OFF ON OFF 15 0 59 0 14 7 58 5 23 0 73 4 22 7 72 9 31 0 87 8 30 7 87 3 13 0 55 4 12 7 54 9 21 0 69 8 20 7 69 3 29 0 84 2 28 7 83 7 20 0 68 0 20 3 68 5 28 0 82 4 28 3 82 9 36 0 96 8...

Page 45: ... 43 MODEL RAI 25RPA RAI 35RPA RAI 50RPA WIRING DIAGRAM INDOOR UNIT ...

Page 46: ...Remote Control CIRCUIT DIAGRAM 45 ...

Page 47: ...CIRCUIT DIAGRAM MODEL RAI 25RPA RAI 35RPA RAI 50RPA 47 ...

Page 48: ... 49 ...

Page 49: ... 51 ...

Page 50: ...min 1 3500 min 1 CJKMAX 1800 min 1 2500 min 1 2700 min 1 CBEMAX 1600 min 1 2200 min 1 2000 min 1 WMIN 1500 min 1 1200 min 1 1800 min 1 CMIN 1500 min 1 1500 min 1 1800 min 1 STARTMC 60 Seconds 60 Seconds 60 Seconds DWNRATEW 80 80 80 DWNRATEC 80 80 80 SHIFTW 4 00 C 4 00 C 4 00 C SHIFTC 1 00 C 1 00 C 2 99 C CLMXTP 30 00 C 30 00 C 30 00 C YNEOF 21 00 C 21 00 C 21 00 C TEION 2 00 C 2 00 C 2 00 C TEIOF ...

Page 51: ... v change operation mode 3 During Cool Dashed operation thermo off temperature is set temperature with shift value 3 C After thermo off operation continue in Fuzzy control mode 4 Compressor minimum ON time and OFF time is 3 minutes 5 During normal cooling mode compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP No time constrain if indoor temperature...

Page 52: ... 57 ...

Page 53: ...C 2 The indoor fan is operated in the Lo mode During thermo OFF indoor fan will be OFF for 5 minutes and ON for 1 minute 3 When the operation is started by the themostat turning ON the start of the indoor fan is delayed 32 seconds after the start of compressor operation 4 The compressor is operated forcedly for 3 minutes after operation is started 5 The minimum ON time and OFF time of the compress...

Page 54: ... 61 ...

Page 55: ...minutes if indoor temperature is higher than 18 C No time limit constrain if indoor temperature is lower than 18 C and outdoor temperature is lower than 2 C 6 During Hotkeep or Defrost mode indoor operation lamp will blink at interval of 3 seconds ON and 0 5 second OFF 7 When heating mode starts it will enter into Hotkeep mode if indoor heat exchanger temperature is lower than YNEOF 0 33 C 8 When ...

Page 56: ... 65 ...

Page 57: ... 67 ...

Page 58: ... 69 REFRIGERATING CYCLE DIAGRAM RAI 25RPA RAI 35RPA RAI 50RPA Single ended union HIGH PRESSURE Service Valve RAI 25RPA 3 8 3 8 RAI 35RPA 3 8 3 8 RAI 50RPA 1 2 1 2 ...

Page 59: ... 70 REFRIGERATING CYCLE DIAGRAM RAI 25RPA RAI 35RPA RAI 50RPA Single ended union HIGH PRESSURE Service Valve RAI 25RPA 3 8 3 8 RAI 35RPA 3 8 3 8 RAI 50RPA 1 2 1 2 ...

Page 60: ... CLOSING 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 ST...

Page 61: ...cuit Fig 2 2 Buzzer Operation When the buzzer sounds an approx 3 9kHz square signal is output from buzzer output pin of the microcomputer 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 DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAI 25RPA RAI 35RPA RAI 50RPA Fig ...

Page 62: ... 73 ...

Page 63: ...m temperature as shown in Fig 4 2 The circuit detects the indoor heat exchanger temperature and controls the following 1 Preheating 2 Low temperature defrosting during cooling and dehumidifying operation 3 Detection of the reversing valve non operation or heat exchanger temperature thermistor open The voltage at depends on the heat exchanger temperature as shown in Fig 5 2 A A ...

Page 64: ...computer reads the data in IC401 E2 PROM and sets the preheating activation value and the rating and maximum speed of the compressor etc to their initial values Data of self diagnosis mode is stored in IC401 data will not be erased even when power is turned off Fig 6 1 ...

Page 65: ... for 3 4 minutes until it is defrosted If the air conditioner operates in cooling mode when it is cold the evaporator may get frosted Normal sound when refrigerant flows in pipe Compressor may not operate when room temperature is 10 C or less It also stops when the humidity is preset humidity or less It occurs during defrosting Wait for 5 10 minutes until the condenser is defrosted At the beginnin...

Page 66: ...ry before stopping operation At this point fan speed is automatic This is because Nice temperature reservation function is operating This function starts operation earlier so the preset temperature is reached at the preset time Operation may start maximum 60 minutes before the preset time It does not work It works only during cooling and heating This is because Nice temperature reservation functio...

Page 67: ...ling capability so noise becomes slightly louder This does not indicate a fault Noise from the outdoor unit occasionally changes The compressor rotation speed changes according to the difference between the thermostat set temperature and room temperature This does not indicate a fault There is a difference between the set temperature and room temperature There may be a difference between the set t...

Page 68: ...mistor is opened circuit or short circuit DC fan motor overcurrent detection Overcurrent in indoor DC fan motor has been detected IC401 data reading fault There was error in the data read from IC401 1 Four way valve faulty 2 Disconnection in heat exchange thermistor only during heating Service SW in outdoor electrical parts turned ON 1 Indoor interface circuit 2 Outdoor interface circuit Please ch...

Page 69: ... 80 ...

Page 70: ... 81 ...

Page 71: ...ISTOR INDOOR NO 5 4 Ɵmes 13 Ɵmes 083 01 WIDE PIPE THERMISTOR INDOOR NO 5 If LD304 blinks the number of blinks indicates a communicaƟon error with the corresponding indoor unit connecƟon Detail as per below table TIMER LAMP BLINKING LD304 BLINKING WIRELESS REMOCON CODE WIRED REMOCON CODE MEANING DETAILS MAIN CHECK POINT 1 Ɵme COMMUNICATION ERROR BETWEEN OUTDOOR AND INDOOR UNIT NO 1 2 Ɵmes COMMUNICA...

Page 72: ... 83 1 Power does not come on no operation CHECKING INDOOR UNIT ELECTRICAL PARTS ...

Page 73: ...N10 Is there 1 Ω or less between L901 and L902 Replace indoor fan motor Check disconnection etc of lead wires Replace Q901 Replace L901 Replace Q903 Replace micro computer Perform final operation check Replace micro computer Replace Q903 Replace Q901 Replace micro computer Replace micro computer Replace the air deflector motor Replace IC111 Perform final operation check Perform final operation che...

Page 74: ... 85 ...

Page 75: ... 86 ...

Page 76: ... 87 HOW TO CHANGE THE SHIFT VALUE for SETTING TEMPERATURE USING WIRED REMOTE CONTROLLER ...

Page 77: ... 88 ...

Page 78: ... 89 ...

Page 79: ... 90 ...

Page 80: ... 91 CHECKING THE REMOTE CONTROLLER ...

Page 81: ... 92 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAI 25RPA RAI 35RPA RAI 50RPA ...

Page 82: ... R04 1 TURBO FAN 6 PMRAI 32CNH2 R05 1 DRAIN PAN ASSEMBLY 7 PMRAI 25RPA R02 1 REMOTE CONTROL ASSEMBLY 8 PMRAK 50PPA R07 1 REMOTE CONTROL SUPPORT 9 PMRAI 32CNH2 010 1 DRAIN CAP 10 PMRAI 25NH4 R04 1 DRAIN PUMP ASSEMBLY 11 PMRAI 25RPA R03 1 CYCLE ASSEMBLY 12 PMRAI 25NH4 007 4 SUSP CLAMP 13 PMRAC 07CV1 R06 1 TERMINAL BOARD 2P 14 PMRAI 25RPA R01 1 P W B MAIN PART N0 RAI 25RPA NO Q TY UNIT PARTS NAME ...

Page 83: ... R04 1 TURBO FAN 6 PMRAI 32CNH2 R05 1 DRAIN PAN ASSEMBLY 7 PMRAI 25RPA R02 1 REMOTE CONTROL ASSEMBLY 8 PMRAK 50PPA R07 1 REMOTE CONTROL SUPPORT 9 PMRAI 32CNH2 010 1 DRAIN CAP 10 PMRAI 25NH4 R04 1 DRAIN PUMP ASSEMBLY 11 PMRAI 25RPA R03 1 CYCLE ASSEMBLY 12 PMRAI 25NH4 007 4 SUSP CLAMP 13 PMRAC 07CV1 R06 1 TERMINAL BOARD 2P 14 PMRAI 35RPA R01 1 P W B MAIN PART N0 RAI 35RPA NO Q TY UNIT PARTS NAME ...

Page 84: ... R04 1 TURBO FAN 6 PMRAI 32CNH2 R05 1 DRAIN PAN ASSEMBLY 7 PMRAI 25RPA R02 1 REMOTE CONTROL ASSEMBLY 8 PMRAK 50PPA R07 1 REMOTE CONTROL SUPPORT 9 PMRAI 32CNH2 010 1 DRAIN CAP 10 PMRAI 25NH4 R04 1 DRAIN PUMP ASSEMBLY 11 PMRAI 50RPA R02 1 CYCLE ASSEMBLY 12 PMRAI 25NH4 007 4 SUSP CLAMP 13 PMRAC 07VC1 R06 1 TERMINAL BOARD 2P 14 PMRAI 50RPA R01 1 P W B MAIN PART N0 RAI 50RPA NO Q TY UNIT PARTS NAME ...

Page 85: ... 96 MODEL RAI ECPP PANEL ...

Page 86: ...HORIZONTAL AIR DEFLECTOR 1 2 PMRAI ECPM 002 2 HORIZONTAL AIR DEFLECTOR 2 3 PMRAI ECPM 003 4 STEPPING MOTOR 4 PMRAI ECPL 004 1 FILTER 5 PMRAI ECPM 004 1 SUCTION GRILL 6 PMRAI ECPP R01 1 P W B DISPLAY PART N0 RAI ECPP NO Q TY UNIT PARTS NAME ...

Page 87: ...HITACHI PM NO 0530E Printed in Malaysia RAI 25RPA RAI 35RPA RAI 50RPA ...

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