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SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
RAD-18RPA
RAD-25RPA
RAD-35RPA
RAD-50RPA
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
DECEMBER 2012
OPTIONAL
WIRED REMOTE
CONTROLLER
(SPX-RCDA)
WIRELESS REMOTE
CONTROLLER
(SPX-RCKA)
RAC-25NPA
RAC-35NPA
RAC-50NPA
INDOOR UNIT
RAD-18RPA
1 PHASE, 50Hz, 220-240V
560 (155-850)
(W)
(A)
2.56~2.35
(kW)
1.80 (0.9 ~ 2.5)
(B.T.U./h)
6,150 (3,070-8,540)
(W)
690 (155-1,050)
(A)
3.20-2.92
(kW)
2.50 (0.9 ~ 3.2)
(B.T.U./h)
8,540 (3,070-10,930)
750
W
235
H
D
400
(kg)
16
INDOOR UNIT + OUTDOOR UNIT
Refrigeration & Air-Conditioning Division
PM
RAD-18RPA
RAD-25RPA / RAC-25NPA
RAD-35RPA / RAC-35NPA
RAD-50RPA / RAC-50NPA
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------ 5
HOW TO USE ---------------------------------------------------------- 7
CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------52
MAIN PARTS COMPONENT --------------------------------------55
WIRING DIAGRAM ---------------------------------------------------57
CIRCUIT DIAGRAM --------------------------------------------------59
BLOCK DIAGRAM ----------------------------------------------------67
BASIC MODE ----------------------------------------------------------69
REFRIGERATING CYCLE DIAGRAM---------------------------87
DESCRIPTION OF MAIN CIRCUIT OPERATION -----------89
SERVICE CALL Q & A -------------------------------------------- 121
PARTS LIST AND DIAGRAM ------------------------------------ 150
DC INVERTER (WALL TYPE)
INDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
RAD-25RPA
RAC-25NPA
RAD-35RPA
1 PHASE, 50Hz, 220-240V
1 PHASE, 50Hz, 220-240V
695 (155-1,050)
1,240 (155-1,280)
3.19~2.93
5.69~5.22
2.50 (0.9 ~ 3.0)
3.50 (0.9 ~ 4.0)
8,540 (3,070-10,240)
11,950 (3,070-13,660)
970 (155-1,400)
1,700 (115-1,920)
4.45-4.08
7.81-7.15
3.50 (0.9 ~ 5.5)
4.80 (0.9 ~ 6.6)
11,950 (3,070-17,070)
16,390 (3,070-22,530)
750
750
750
235
570
235
400
280
400
16
38
16
NO. 0531E
CONTENTS
OUTDOOR UNIT
INDOOR UNIT
OUTDOOR UNIT
RAC-35NPA
RAD-50RPA
RAC-50NPA
1 PHASE, 50Hz, 220-240V
2,000 (155-2,060)
9.10~8.37
5.0 (0.9 ~ 5.6)
17,070 (3,070-19,120)
2,300 (155-2,530)
9.87-9.05
6.0 (0.9 ~ 7.5)
20,490 (3,070-25,610)
750
750
850
570
235
650
280
400
298
38
16
45
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Related Manuals for Hitachi RAD-25RPA
Summary of Contents for Hitachi RAD-25RPA
- Page 1 NO. 0531E RAD-18RPA RAD-25RPA / RAC-25NPA SERVICE MANUAL RAD-35RPA / RAC-35NPA RAD-50RPA / RAC-50NPA TECHNICAL INFORMATION FOR SERVICE PERSONNEL ONLY REFER TO THE FOUNDATION MANUAL CONTENTS SPECIFICATIONS ------------------------------------------------------ 5 HOW TO USE ---------------------------------------------------------- 7 CONSTRUCTION AND DIMENSIONAL DIAGRAM ---------52 MAIN PARTS COMPONENT --------------------------------------55...
- 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 relative manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned). 2.
- 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 Screw stop at the screwed...
- Page 5 CAUTION In quiet operation or stopping the running, 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.
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- Page 8 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. The “Caution” section contains matters which may result in serious consequences if not observed properly.
- 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 MULTI-AIR CONDITIONER With this multi-air conditioner, several indoor units can be connected to one outdoor unit to be driven. You can operate the required number of indoor units. Combination of Operations: When operation mode is selected: ● You cannot operate the indoor units in the following combinations.
- Page 11 NAMES AND FUNCTIONS OF EACH PART INDOOR UNIT MODEL NAME AND DIMENSIONS MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm) RAD-18RPA/RAD-25RPA/RAD-35RPA/RAD-50RPA – 10 –...
- 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”. HOW TO USE THE AIR CONDITIONER EFFECTIVELY 1.
- Page 13 THE IDEAL WAYS OF OPERATION Suitable Room Temperature Install curtain or blinds Warning It is possible to reduce heat Freezing temperature entering the is bad for health and a room through waste of electric power. windows. Ventilation Effective Usage Of Timer At night, please use the “OFF or ON timer Caution operation mode”, together with your wake up...
- 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 MAINTENANCE WARNING ● Before cleaning, stop unit operation with the remote controller and turn off the circuit breaker. CAUTION ● Do not expose the unit to water as it may cause an electric shock. ● For cleaning inside the air conditioner, consult your sales agent. ●...
- Page 16 REGULAR INSPECTION PLEASE CHECK THE FOLLOWING POINTS BY QUALIFIED SERVICE PERSONAL EITHER EVERY HALF YEARLY OR YEARLY. CONTACT YOUR SALES AGENT OR SERVICE SHOP. Is the earth line disconnected or broken? Is the mounting frame seriously affected by rust and is the outdoor unit tilted or unstable? Is the plug of power line fi...
- Page 17 Please note: On switching on the equipment, particularly when the room light is dimmed, a slight brightness fl uctuation may occur. This is of no consequence. The conditions of the local Power Supply Companies are to be observed. MEMO ..........................................................................
- Page 18 PRECAUTIONS FOR USE In case of power failure happen, Wired Remote Controller may not show current operating mode when power ● comes back. However unit will continue to operate at previous setting mode. Some features of Wireless Remote Controller are not available when use Wired Remote Controller as mentioned ●...
- Page 19 NAMES AND FUNCTIONS OF REMOTE CONTROLLER ■ This controls the operation function and timer setting of the room air conditioner. OPERATION LAMP Transmission Sign The transmission sign blinks START/STOP Button when a signal has been send. Press this button to start operation. Press it again to stop operation.
- Page 20 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. (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 21 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 –15°C Press the MODE SELECTOR button so that the display indicates (HEAT).
- Page 22 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). Press (FAN SPEED) button to select SILENT or LOW fan speed.
- Page 23 COOLING OPERATION Use the device for cooling when the outdoor temperature is –10 ~ 43°C. If indoor 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 24 LEAVE HOME(LH) AND CLEAN (ONE TOUCH CLEAN) OPERATIONS Leave Home (LH) and CLEAN(One Touch Clean) operations activation buttons are not available on this device. ● The operations shall be activated by wireless remote controller. Please refer to wireless 'Remote Controller Manual' to activate the operations. ●...
- Page 25 TIMER RESERVATION ■ ON Timer and OFF Timer are available. ■ Operation stop at setting timer OFF Timer Reservation OFF TIMER setting ● Select the OFF TIMER by pressing the (OFF) Button. ● Setting timer will change according to the below sequence when you press the button.
- Page 26 HOW TO SET THE SLEEP TIMER Mode Indication 1 hour 2 hours 3 hours 7 hours Sleep timer Sleep timer off Sleep Timer: The device will continue working for the designated number of hours and then turn off. Press the SLEEP button. The timer information will be displayed on the remote controller.
- Page 27 INSTALLATION OF WIRED REMOTE CONTROLLER Connection to the electrical box; ● Remove the cover of electric box ● Connect the connector of wired remote controller to CN1102 of electrical board ● Assemble back the cover of electrical box Wiring installation for wired remote controller (2 methods); ●...
- Page 28 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 29 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 30 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 31 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. 36) press this button, the mode will (AUTO) ➞ change from (HEAT) ➞...
- Page 32 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 33 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 34 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 35 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 36 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 37 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 38 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 39 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 40 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 41 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 42 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 43 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 44 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 45 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 46 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 47 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 48 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 49 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 50 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 51 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 52 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.
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- Page 59 CIRCUIT DIAGRAM Wired Remote Controller – 59 –...
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- Page 62 CIRCUIT DIAGRAM MODEL RAC-25NPA, RAC-35NPA, RAC-50NPA – 65 –...
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- Page 66 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 116 Remarks: When this unit were mean to be connected to mul outdoor unit system, below diagnosis table shall be use. If LD301 lit and at the same me LD302 blinks in a number of mes, this indicates thermistor faulty. TIMER WIRELESS WIRED LD302...
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- Page 146 HITACHI RAD-18RPA RAD-25RPA / RAC-25NPA PM NO. 0531E RAD-35RPA / RAC-35NPA RAD-50RPA / RAC-50NPA Printed in Malaysia...