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Hitachi RAC-70WPA Service Manual

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SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
COOLING
CAPACITY
TOTAL INPUT
TOTAL AMPERES
HEATING
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
FEBRUARY 2013
HITACHI
RAK-70PPA
RAC-70WPA
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
INDOOR UNIT + OUTDOOR UNIT
Refrigeration & Air-Conditioning Division
PM
RAK-70PPA/RAC-70WPA
REFER TO THE FOUNDATION MANUAL
CAUTION ----------------------------------------------------------------- 4
SPECIFICATIONS ------------------------------------------------------ 5
INSTALLATION ---------------------------------------------------------- 6
HOW TO USE ---------------------------------------------------------- 7
MAIN PARTS COMPONENT --------------------------------------46
WIRING DIAGRAM ---------------------------------------------------48
CIRCUIT DIAGRAM --------------------------------------------------49
BLOCK DIAGRAM ----------------------------------------------------58
BASIC MODE ----------------------------------------------------------59
REFRIGERATING CYCLE DIAGRAM---------------------------77
SERVICE CALL Q & A ----------------------------------------------93
TROUBLE SHOOTING ----------------------------------------------97
PARTS LIST AND DIAGRAM ------------------------------------ 123
(WALL TYPE)
INDOOR UNIT
RAK-70PPA
1 Ø, 50/60 Hz, 220-240V
2,170 (200 - 2,820)
9.95 - 9.10
7.00 (1.50 - 8.00)
23,900 (5,120 - 27,315)
2,200 (200 - 2,970)
10.10 - 9.30
8.00 (1.50 - 9.20)
27,300 (5.119 - 31,396)
1150
333
245
15
NO. 0542E
CONTENTS
OUTDOOR UNIT
RAC-70WPA
850
800
298
55
After installation

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  • Page 1: Table Of Contents

    NO. 0542E RAK-70PPA/RAC-70WPA SERVICE MANUAL REFER TO THE FOUNDATION MANUAL TECHNICAL INFORMATION FOR SERVICE PERSONNEL ONLY CONTENTS CAUTION ----------------------------------------------------------------- 4 SPECIFICATIONS ------------------------------------------------------ 5 INSTALLATION ---------------------------------------------------------- 6 HITACHI HOW TO USE ---------------------------------------------------------- 7 CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------44 MAIN PARTS COMPONENT --------------------------------------46...
  • Page 2 SAFETY DURING REPAIR WORK 1. In order to disassemble and repair the unit in question, be sure to disconnect the power cord plug from the power outlet before starting the work. 2. If it is necessary to replace any parts, they should be replaced with respective genuine parts for the unit, and the replacement must be effected in correct manner according to the instructions in the Service Manual of the unit.
  • Page 3 WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS 1. Scope The standards provide for items to be generally observed in carrying and handling semiconductors in rela- tive manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned).
  • Page 4 (6) Use a three wire type soldering iron including a grounding wire. Metal plate (of aluminium, stainless steel, etc.) Working table Resistor of 1 M (1/2W) Staple Earth wire Bare copper wire (for body earth) Fig. 3. Grounding of the working table Soldering iron Grounding wire...

  • Page 5: Caution

    CAUTION In quiet or stop operation, slight fl owing noise of refrigerant in the refrigerating cycle is heard occasionally, but this noise is not abnormal for the operation. When it thunders near by, it is recommend to stop the operation and to disconnect the power cord plug from the power outlet for safety.

  • Page 6: Specifications

    SPECIFICATIONS MODEL RAC-70WPA RAK-70PPA FAN MOTOR 47 W 30 W FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR – COMPRESSOR JU1015D9 COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR YES (INTERNAL) OVERHEAT PROTECTOR 3.15A 3.15A FUSE (MICRO COMPUTER CIRCUIT) POWER RELAY POWER SWITCH TEMPORARY SWITCH...
  • Page 7 Figure showing the installation of Indoor and Outdoor unit The indoor piping should be insulated with the enclosed insulation pipe. (If the insulator is insuffi cient, please use commercial products). The difference in height ● between the indoor and outdoor unit should be kept max 20m.

  • Page 8: Installation

    SAFETY PRECAUTION ● Please read the “Safety Precaution” carefully before operating the unit to ensure correct usage of the unit. Pay special attention to signs of “ Warning” and “ Caution”. The “Warning” section contains matters which, if not ● observed strictly, may cause death or serious injury.
  • Page 9 PRECAUTIONS DURING OPERATION The product shall be operated under the manufacturer specifi cation and ● not for any other intended use. Do not attempt to operate the unit with wet hands, this could cause fatal ● accident. When operating the unit with burning equipments, regularly ventilate the ●...
  • Page 10 1 year depending on application requirements. OUTDOOR UNIT DRAIN PIPE Condensed water drain to outside. CONNECTING CORD AIR INLET (BACK, LEFT SIDE) AIR OUTLET MODEL NAME AND DIMENSIONS MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm) 1150 RAK-70PPA RAC-70WPA – 9 –...
  • Page 11 INDOOR UNIT INDICATORS TIMER LAMP This lamp lights when the timer is working. OPERATION LAMP This lamp lights during operation. The OPERATION LAMP fl ashes in the following cases during heating. (1) During preheating For about 2–3 minutes after starting up. (2) During defrosting Defrosting will be performed about once an hour when frost forms on the heat exchanger of the...
  • Page 12 Note The recommended temperature range for safety testing should be as below: ● Cooling Heating Minimum Maximum Minimum Maximum Dry bulb °C Indoor Wet bulb °C Dry bulb °C Outdoor Wet bulb °C CIRCUIT BREAKER When you do not use the room air conditioner, set the circuit breaker to “OFF”. –...
  • Page 13 THE IDEAL WAYS OF OPERATION Suitable Room Temperature Install curtain or blinds Warning It is possible to reduce heat Freezing temperature entering is bad for health and room through a waste of electric windows. power. Ventilation Effective Usage Of Timer At night, please use the “OFF or ON timer Caution operation mode”, together with your wake...
  • Page 14 FOR USER’S INFORMATION The Air Conditioner And The Heat Source In The Room Caution If the amount of heat in the room is above the cooling capability of the air conditioner (for example: more people entering the room, using heating equipments and etc.), the preset room temperature cannot be achieved.
  • Page 15 ATTACHING THE AIR PURIFYING FILTERS CAUTION Cleaning and maintenance must be carried out when fi lter lamp lights. Before cleaning, stop operation and switch off the power supply. Open the front panel ● Pull up the front panel by holding it at both sides with both hands.
  • Page 16 MAINTENANCE CAUTION Cleaning and maintenance must be carried out only by qualifi ed service personnel. Before cleaning, stop operation and switch off the power supply. PRE-FILTER Clean the Pre-fi lter, as it removes dust inside the room. In case the Pre-fi lter is full of dust, the air fl ow will decrease and the cooling capacity will be reduced.
  • Page 17 Washable Front Panel Remove the front panel and wash with clean water. ● Wash it with a soft sponge. After using neutral detergent, wash thoroughly with clean water. When front panel is not removed, wipe it with a soft ● dry cloth.
  • Page 18 CAUTION Cleaning and maintenance must be carried out only by qualifi ed service personnel. Before cleaning, stop operation and switch off the power supply. MAINTENANCE AT BEGINNING OF LONG OFF PERIOD ● Run the unit by setting the operation mode to (COOL), the temperature to 32°C and the fan speed to HI for about half a day on a fi...
  • Page 19 AFTER SALE SERVICE AND WARRANTY WHEN ASKING FOR SERVICE, CHECK THE FOLLOWING POINTS. CONDITION CHECK THE FOLLOWING POINTS If the remote controller is not Do the batteries need replacement? ● transmitting a signal. Is the polarity of the inserted batteries correct? ●...
  • Page 20 PREPARATION BEFORE OPERATION ■ To install the batteries 1. Slide the cover to take it off. 2. Install two dry batteries AAA.LR03 (alkaline). The direction of the batteries should match the marks in the case. 3. Replace the cover at its original position. ■...
  • Page 21 PREPARATION BEFORE OPERATION ■ To set calendar and clock 1. Press (RESET) button when fi rst time setting. "Year" blinks. 2. Press (TIME) button to set the current year. 3. Press (CLOCK) button. "Day" and "Month" blink. 4. Press (TIME) button to set the current day and month.
  • Page 22 NAMES AND FUNCTIONS OF REMOTE CONTROLLER REMOTE CONTROLLER This controls the operation of the indoor unit. The range of control is about 7 meters. If indoor lighting is ● controlled electronically, the range of control may be shorter. This unit can be fi xed on a wall using the fi xture provided. Before fi xing it, make sure the indoor unit can be controlled from the remote controller.
  • Page 23 NAMES AND FUNCTIONS OF REMOTE CONTROLLER MODE selector Button POWERFUL Button Use this button to select the Use this button to set the operating mode. Every time you POWERFUL mode. ( p. 28) press this button, the mode will (AUTO) ➞ change from (HEAT) ➞...
  • Page 24 VARIOUS FUNCTIONS ■ Auto Restart Control If there is a power failure, operation will be automatically restarted when the power is resumed with previous operation ● mode and airfl ow direction. (As the operation is not stopped by remote controller.) If you intend not to continue the operation when the power is resumed, switch off the power supply.
  • Page 25 HEATING OPERATION Use the device for heating when the outdoor temperature is under 21°C. ● When it is too warm (over 21°C), the heating function may not work in order to protect the device. In order to maintain reliability of the device, please use this device when outdoor temperature is above ●...
  • Page 26 DEHUMIDIFYING OPERATION Use the device for dehumidifying when the room temperature is over 16°C. When it is under 15°C, the dehumidifying function will not work. Press the MODE selector button so that the display indicates (DEHUMIDIFY). The fan speed is set at LOW. Press (FAN SPEED) button to select SILENT or LOW fan speed.
  • Page 27 COOLING OPERATION Use the device for cooling when the outdoor temperature is -10~ 43°C. If indoors humidity is very high (80%), some dew may form on the air outlet grille of the indoor unit. Press the MODE selector button so that the display indicates (COOL).
  • Page 28 FAN OPERATION User can use the device simply as an air circulator. Press the MODE selector so that the display indicates (FAN). Set the desired FAN SPEED with the (FAN SPEED) button (the display indicates the setting). (HIGH) (MED) (LOW) (SILENT) START Press the...
  • Page 29 POWERFUL OPERATION By pressing (POWERFUL) button during AUTO, HEATING, DEHUMIDIFYING, COOLING or FAN ● operation, the air conditioner performs at the maximum power. During POWERFUL operation, cooler or warmer air will be blown out from indoor unit for COOLING or ●...
  • Page 30 SILENT OPERATION By pressing (SILENT) button during AUTO, HEATING, DEHUMIDIFYING, COOLING or FAN ● operation, the fan speed will change to ultra slow. ■ To start SILENT operation Press (SILENT) button during operation. ● “ ” is displayed on the LCD. Fan speed will be ultra slow. ■...
  • Page 31 ECO OPERATION ECO operation is an energy saving function by changing set temperature automatically and by limiting the maximum power consumption value. By pressing the (ECO) button during AUTO, HEATING, ● DEHUMIDIFYING or COOLING operation, the air conditioner performs the "ECO" operation. ■...
  • Page 32 LEAVE HOME(LH) OPERATION Prevent the room temperature from falling too much by setting temperature 10°C automatically when no one is at home. This operation is able to operate by "Continuous operation" or "Day timer operation". Please use "Day timer operation" to set the number of days up to 99 days.
  • Page 33 CLEAN (ONE TOUCH CLEAN) OPERATION Drying indoor heat exchanger after cooling operation to prevent mildew. ■ To start CLEAN operation Press (CLEAN) button when unit is OFF. ● Total time taken for One Touch Clean operation is 60 minutes. During this operation, HEATING or FAN operation shall operate.
  • Page 34 ONCE TIMER (ON/OFF TIMER) OPERATION OFF TIMER The device can be set to turn off at a preset time. 1. Press (OFF-TIMER) button. blink on the display. 2. Set the "turn-off time" with (TIME) button. 3. After setting, direct the remote controller towards the indoor and press (SEND) button.
  • Page 35 ECO SLEEP TIMER OPERATION The timer can be set up to a duration of 7 hours. By pressing (SLEEP) button during AUTO, HEATING, DEHUMIDIFYING, COOLING or FAN operation, the unit shifts the room temperature and reduces the fan speed. It results in energy saving. Set the current time fi...
  • Page 36 ECO SLEEP TIMER OPERATION ■ To set ECO SLEEP TIMER and ON TIMER The air conditioner will be turned off by ECO SLEEP TIMER and turned on by ON TIMER. 1. Set the ON TIMER. 2. Press (SLEEP) button and set ECO SLEEP TIMER. Example: In this case, air conditioner will turn off in 2 hours (at 1:38) and it will be turned on at 6:00 the next morning.
  • Page 37 WEEKLY TIMER OPERATION It is possible to select Mode A or Mode B. For each mode, up to 6 programs can be set per day. In total, a ● maximum of 42 programs can be set for a week for each mode. If calendar and clock are not set, the reservation setting for WEEKLY TIMER cannot be set.
  • Page 38 WEEKLY TIMER OPERATION 5. Press (ON-OFF TIMER) button to select ON TIMER or OFF TIMER reservation. 6. Press (TIME) button to set time reservation. 7. Press (TEMP ) button to set temperature reservation. 8. Press (OK) button. The reservations are set. Day, program number, ON reservation, setting temperature will light up.
  • Page 39 WEEKLY TIMER OPERATION Step 2: Select Mode A or Mode B and activate or deactivate WEEKLY TIMER. ■ How to select Mode A or Mode B of WEEKLY TIMER setting. 1. Press (WEEKLY) button. blink on the display. (Normally Mode A will blink fi rst). 2.
  • Page 40 WEEKLY TIMER OPERATION Step 3: Copy and cancel the reservation schedule. ■ How to copy and paste. Editing the reservation schedule is easy by copying data from one day to another day. 1. Press (WEEKLY) button to select Mode A or Mode B. 2.
  • Page 41 WEEKLY TIMER OPERATION Step 3: Copy and cancel the reservation schedule. ■ How to delete WEEKLY TIMER data. [Delete one program number reservation] 1. Press (WEEKLY) button to select Mode A or Mode B. 2. Press (WEEKLY) button for 3 seconds to start editing the reserva- tion schedule.
  • Page 42 WEEKLY TIMER OPERATION Step 3: Copy and cancel the reservation schedule. [Delete one day reservation] 1. Press (WEEKLY) button to select Mode A or Mode B. 2. Press (WEEKLY) button for 3 seconds to start editing the reservation schedule. 3. Press (DAY) button to select a day of the week to edit.
  • Page 43 INFO FUNCTION By pressing (INFO) button, temperature around remote controller and monthly power consumption will be ● displayed on the remote controller. After changing the batteries, direct the remote controller towards the indoor unit and press (INFO) button. ● Current calendar and clock will be transmitted from indoor unit. In order to receive information from indoor unit, the distance between remote controller and receiver of indoor units is ●...
  • Page 44 OPERATION MODE LOCK The remote controller can be set to fi x the HEATING mode (including FAN), COOLING mode (including FAN) and DEHUMIDIFYING mode (including FAN) operations. ■ Method to lock HEATING mode (including FAN) operation. Press (ECO) and (POWERFUL) buttons simultaneously for about 5 seconds when the remote controller is OFF.

  • Page 45: Construction And Dimensional Diagram

    CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK-70PPA About When piping is drawn horizontally, exchange Viewed from back the drain hose for the (bottom direction pipe drain cap. lead-out) Note: 1. Service space (free space needed for servicing) is 200mm on the right, 100mm on the left and 50mm on top. 2.
  • Page 46 MODEL RAC-70WPA – 45 –...

  • Page 47: Main Parts Component

    RAK-70PPA POWER SOURCE DC: 100 ~ 391V OUTPUT CONNECTION (Control circuit built in) OUTDOOR FAN MOTOR Fan Motor Specifi cations MODEL RAC-70WPA ITEM POWER SOURCE DC: 120 ~ 380V OUTPUT (W) MAX COIL 20°C U-V 35 ± 2.5 V-W 35 ± 2.5 W-U 35 ±...
  • Page 48 COMPRESSOR MOTOR Compressor Motor Specifi cations MODEL RAC-70WPA COMPRESSOR MODEL JU1015D9 PHASE SINGLE RATED VOLTAGE AC 220 ~ 240 V RATED FREQUENCY 50/60 Hz POLE NUMBER CONNECTION 20°C 2M = 1.2984 (68°F) RESISTANCE VALUE 75°C 2M = 1.7671 (167°F) CAUTION When the Air Conditioner has been operated for a long time with the capillary tubes clogged or crushed or with too little refrigerant, check the color of the refrigerant oil inside the compressor.
  • Page 49 – 48 –...

  • Page 50: Circuit Diagram

    CIRCUIT DIAGRAM Remote Control – 49 –...
  • Page 51 CIRCUIT DIAGRAM MODEL RAK-70PPA – 51 –...
  • Page 52 CIRCUIT DIAGRAM MODEL RAC-70WPA – 53 –...

  • Page 53: Printed Wiring Board Location Diagram

    PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAK-70PPA MAIN P.W.B. Marking on P.W.B COMPONENT SIDE SOLDERING SIDE RECEIVING P.W.B. Marking on P.W.B – 55 –...
  • Page 54 MODEL RAC-70WPA P.W.B. MAIN – 56 –...
  • Page 55 P.W.B. IPM-BOARD P.W.B. CAPA-BOARD – 57 –...
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  • Page 58 Table 1 Mode data fi le RAK-70PPA LABEL NAME VALUE WMAX 5700 min –1 WMAX2 5700 min –1 WSTD 5400 min –1 WBEMAX 3800 min –1 CMAX 5200 min –1 CSTD 4900 min –1 CKYMAX 4000 min –1 CJKMAX 4000 min –1 CBEMAX 2300 min...
  • Page 59 Table 2 Δ TCMAX Temperature Calculated difference compressor rpm 1.66 2265 min –1 2435 min –1 2.33 2600 min –1 2.66 2765 min –1 2935 min –1 3.33 3100 min –1 3.66 3265 min –1 3435 min –1 4.33 3600 min –1 4.66 3765 min...
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  • Page 63 Table 3 Δ TWMAX Temperature Calculated difference compressor rpm 1.66 1965 min –1 2135 min –1 2.33 2300 min –1 2.66 2465 min –1 2635 min –1 3.33 2800 min –1 3.66 2965 min –1 3135 min –1 4.33 3300 min –1 4.66 3465 min...
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  • Page 66: Refrigerating Cycle Diagram

    REFRIGERATING CYCLE DIAGRAM MODEL RAK-70PPA/RAC-70WPA – 77 –...
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  • Page 68: Description Of Main Circuit Operation

    DESCRIPTION OF MAIN CIRCUIT OPERATION RAK-70PPA 1. Reset Circuit – 79 –...
  • Page 69 2. Buzzer Circuit When the buzzer is to be activated, buzzer output pin of the micro computer alternates between ON and OFF repeatedly at 4kHz and Q301 is turned ON/OFF accordingly. A 4kHz voltage/frequency is applied to the buzzer and the diaphragm of the buzzer vibrates to output 4kHz sound. 3.
  • Page 70 5. Auto Sweep Motor Circuit Fig. 5-1 Auto Sweep Motor Circuit (Horizontal air defl ectors only) Fig. 5-1 shows the Auto sweep motor drive circuit; the signals shown in Fig. 5-2 are output from pins ● – of the micro computer. Fig.
  • Page 71 6. Room Temperature Thermistor Circuit Fig. 6-1 shows the room temperature The voltage at A depends on the room ● ● thermistor circuit. temperature as shown in Fig. 6-2. 7. Heat exchanger temperature thermistor circuit The circuit detects the indoor heat ●...
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  • Page 78 <Reference> When the thermistor is open, open condition or disconnect, microcomputer pin 65~67 are approx. 0V; When thermistor is shorted, they are approx. 5V and LD301 will blink as below table:- Table 4-2 LD 301 Blinking Thermistor Thermistor OH Thermistor Outdoor Thermistor Defrost Thermistor Condition...
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  • Page 82: Service Call Q

    SERVICE CALL Q & A – 93 –...
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  • Page 86: Trouble Shooting

    TROUBLE SHOOTING – 97 –...
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  • Page 91 TROUBLESHOOTING WHEN TIMER LAMP BLINKS. MODEL RAK-70PPA Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink. SELF-DIAGNOSIS LIGHTING MODE Blinking of Timer lamp Reason for indication Possible cause Refrigerant cycle defective (1) Reversing valve defective (2) Heat exchanger thermistor When the indoor heat exchanger disconnected...
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  • Page 94 CHECKING INDOOR UNIT ELECTRICAL PARTS 1. Power does not come on (no operation) – 105 –...
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  • Page 96 3. Only indoor fan does not operate (other is normal) 4. Air defl ector does not move (others are normal) 5. All systems stop from several seconds to several minutes after operation is started (all indicators are also off) – 107 –...
  • Page 97 6. Check the main P.W.B (power circuit) – 108 –...
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  • Page 106 1. Switch OFF main power supply. 2. Short circuit between JW001 and JW002. 3. Switch ON main power supply – LD301 will blink 1 time. 4. (Within 3 minutes) Press Test/Service Switch for 1 second or more. 5. Self-diagnosis result will be shown – LD303 will ON (LIT) and LD301 will be blinking. Then refer to diagnosis table 2.
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  • Page 110 CHECKING THE REMOTE CONTROLLER – 121 –...
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  • Page 112 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL : RAK-70PPA – 123 –...
  • Page 113 MODEL RAK-70PPA PART NO. T ’ PARTS NAME PMRAS-30CHP6 CABINET ASSY PMRAS-72CHA3 MOUNTING PLATE PMRAS-80YHA FAN MOTOR PMRAS-80YHA TANGENTIAL FAN PMRAS-72CHA3 P-BEARING ASSY PMRAS-72CHA3 FAN MOTOR SUPPORT PMRAS-70YH7 CYCLE ASSY PMRAS-72CHA3 BEARING COVER PMRAS-24CE9G PIPE SUPPORT (U-COVER) PMRAS-80YHA DRAIN PAN ASSY PMRAS-72CHA3 AUTO SWEEP MOTOR PMRAS-70YH7...

  • Page 114: Parts List And Diagram

    PARTS LIST AND DIAGRAM OUTDOOR UNIT MODEL : RAC-70WPA – 125 –...
  • Page 115 MODEL RAC-70WPA PART N0. Q’TY / UNIT PARTS NAME PMRAC-60YH7 COMPRESSOR KPNT1 PUSH NUT RAC-2226HV COMPRESSOR RUBBER PMRAC-70YHA CONDENSER PMRAC-X24CAT REVERSING VALVE PMRAC-70WPA ELECTRICAL EXPANSION COIL PMRAC-70YHA3 VALVE (5S) PMRAC-50NH4 VALVE (2S) PMRAM-72Q8 THERMISTOR (OH) PMRAC-25NH4 OVERHEAT THERMISTOR SUPPORT PMRAC-X13CX...
  • Page 116 RAK-70PPA / RAC-70WPA PM NO. 0542E Printed in Malaysia...

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