Инструкция на Кондиционеры Hitachi серии MULTIZONE RAD...NH.../RAC...NH... бренда Hitachi

NO. 0420E

PM RAD-18NH7A RAD-25NH7A/RAC-25NH5 RAD-35NH7A/RAC-35NH5 RAD-50NH7A/RAC-50NH5 SERVICE MANUAL TECHNICAL INFORMATION REFER TO THE FOUNDATION MANUAL FOR SERVICE PERSONNEL ONLY CONTENTS SPECIFICATIONS 4 HOW TO USE 6 CONSTRUCTION AND DIMENSIONAL DIAGRAM 24 MAIN PARTS COMPONENT 27 WIRING DIAGRAM 29 CIRCUIT…

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. t nec n o c t dis lug s u p t, I m r cord utlet. s r i o e F pow wer the the po from 2. If it is necessary to replace any parts, they should be…

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. Object parts (1) Micro computer…

(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 part using a rag plate Fig. 4. Grounding a soldering iron Use a…

In quiet operation or stopping the running, slight flowing noise of refrigerant in the refrigerating cycle is heard occasionally, but this noise is not abnormal for the operation. 2. When it thunders near by, it is recommend to stop the operation and to disconnect the power cord plug from the power…

SPECIFICATIONS

[Indoor unit installation]

! CAUTION Always install the indoor unit at level. If the indoor unit is inclined, water may leak. Be sure to completely seal any gap with putty. ● The connecting pipe, no matter big or small, should all be insulated with insulation pipe and then wrapped with vinyl tape. (The insulator will…

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”…

PRECAUTIONS DURING OPERATION

● The product shall be operated under the manufacturer specification 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 room to avoid oxygen…

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. One unit The…

NAMES AND FUNCTIONS OF EACH PART

INDOOR UNIT Electrical box Air outlet Filter Wired Remote controller Air inlet MODEL NAME AND DIMENSIONS MODEL WIDTH (mm) HEIGHT (mm) DEPTH (mm) RAD-18NH7A/RAD-25NH7A/RAD-35NH7A/RAD-50NH7A – 9 –

NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT

■ This controls the operation function and timer setting of the room air conditioner. START/STOP Button Use this button to select the operating mode. Every time you press it, the mode will change from (AUTO) to (HEAT) to (DEHUMIDIFY) and to (COOL) cyclically. Hr. This determines the fan speed. Every…

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…

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 keep reliability of the device, please use this device above -15°C of the outdoor temperature. 1 2 Press the…

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. 1 Press the FUNCTION selector so that the display indicates (DEHUMIDIFY). The FAN SPEED is set at LOW or SILENT. Set the desired room temperature with the…

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. 1 Press the FUNCTION selector so that the display indicates (COOL). Set the desired FAN SPEED with the (the display indicates…

TIMER RESERVATION

■ ON Timer and OFF Timer are available. ■ Operation stop at setting time OFF Timer Reservation 1 OFF TIME setting ● ● Select the OFF TIME by pressing the (OFF) Button. Setting time will change according to the below sequence when you press the button. 0.5 hour interval 1 hour interval 0.5 1.0 1.5 ●…

HOW TO SET THE SLEEP TIMER

Mode Sleep timer Indication 4 1 hour 4 2 hours 4 3 hours 4 7 hours Sleep timer off 1 Hr. Sleep Timer: The device will continue working for the designated number of hours and then turn off. Press the SLEEP button, indoor unit will produce a beep. The timer information will be displayed on the remote…

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. NOTE ● ● ● ● If you set the sleep timer after the off or on-timer has been set, the sleep timer becomes effective instead of the off or on-timer set earlier. You can not set other…

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. An average room temperature setting is probably the best for you as well as being economical. Excessive cooling or heating is not recommended for health reasons. High…

THE IDEAL WAYS OF OPERATION

Suitable Room Temperature Install curtain or blinds ! Warning It is possible to reduce heat entering the room through windows. Freezing temperature is bad for health and a waste of electric power. Ventilation Effective Usage Of Timer At night, please use the “OFF or ON timer operation mode”…

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. Not Operating For A…

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. ● Avoid using detergent when cleaning the…

REGULAR INSPECTION

PLEASE CHECK THE FOLLOWING POINTS BY QUALIFIED SERVICE PERSONAL EITHER EVERY HALF YEARLY OR YEARLY. CONTACT YOUR SALES AGENT OR SERVICE SHOP. 1 Is the earth line disconnected or broken? 2 Is the mounting frame seriously affected by rust and is the outdoor unit tilted or unstable? 3 Is the plug of…

Please note

On switching on the equipment, particularly when the room light is dimmed, a slight brightness fluctuation may occur. This is of no consequence. The conditions of the local Power Supply Companies are to be observed. Note ● Avoid to use the room air conditioner for cooling operation when the outside…

CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR INDOOR

BACK SUCTION

13 DISCHARGE BOTTOM SUCTION Cautions: 1. Use insulated pipes for both large and small diameters. – 25 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR OUTDOOR

MODEL RAC-25NH5, RAC-35NH5 MODEL RAC-50NH5 Air outlet More than More than 100 More than Fixing hole More than Holes for anchor bolt (2-ø12) 201 340 Air suction grille 169.5 Handle Handle 198 Service space Notch for anchor bolt (2-ø12 Notchs) – 26 –

MAIN PARTS COMPONENT

THERMOSTAT Thermostat Specifications MODEL RAD-18NH7A, RAD-25NH7A, RAD-35NH7A, RAD-50NH7A THERMOSTAT MODEL IC OPERATION MODE TEMPERATURE °C (°F) COOL HEAT INDICATION 16 ON 14.9 (59.3) 20.4 (68.8) OFF 14.3 (58.3) 21.0 (69.1) INDICATION 24 ON 22.9 (73.7) 28.4 (83.1) OFF 22.3 (72.7) 29.0 (84.1)…

COMPRESSOR MOTOR

Compressor Motor Specifications MODEL RAC-25NH5. RAC-35NH5 RAC-50NH5 JU1012D JU1013D COMPRESSOR MODEL PHASE SINGLE RATED VOLTAGE AC 220 ~ 240 V RATED FREQUENCY 50 Hz POLE NUMBER 4 (U) WHITE M CONNECTION M (V) RESISTANCE VALUE ( ) YELLOW 20°C (68°F) 2M = 1.05 75°C (167°F) 2M = 1.28 M (W) RED WHITE…

WIRING DIAGRAM

CIRCUIT DIAGRAM

Wired Remote Control – 31 –

таблицы и схемы — в просмотре

SPM2 L N Outdoor unit Terminal board Trip signal synthesis circuit Wired remote control receiver circuit Buzzer circuit Room temperature thermistor Static pressure select switch Drain pump test switch Temporary switch Indoor microcomputer (AX-7X20) Heat exchanger thermistor Indicating lamp Operation…

wireless remote controller. 16 47. – 39 – 27

Table 1 Mode data file

RAD-18NH7A RAD-25NH7A LABEL NAME RAD-35NH7A RAD-50NH7A VALUE WMAX 4400 min–1 4400 min–1 5500 min–1 5100 min–1 WMAX2 4500 min–1 4500 min–1 5600 min–1 5100 min–1 WSTD 3500 min–1 3500 min–1 4950 min–1 5100 min–1 WBEMAX 3000 min–1 2800 min–1 2800 min–1 3500 min–1 CMAX 2700 min–1 2700 min–1 4400 min–1…

Table 2 ∆TCMAX

NOTE (9) Temperature difference Calculated compressor rpm 1.66 2 2265 min–1 2435 min–1 2.33 2600 min–1 2.66 3 2765 min–1 2935 min–1 3.33 3.66 3100 min–1 3265 min–1 4 3435 min–1 4.33 4.66 3600 min–1 3765 min–1 5 5.33 3935 min–1 4100 min–1 5.66 6 4265 min–1 4435 min–1 6.33 4600 min–1 6.66 7 4765 min–1…

Cooling Sleep Operation

Final set temperature (Cooling/dehumidifying set temperature (+) sleep shift) (Cooling/dehumidifying set temperature = Remote control set temperature (+) SHIFTC) 0.5hr 2.5hr 1.5hr 3.5hr 6hr 7hr 3hr Set to 7 hours Sleep key Operation lamp Timer lamp Hi Med Indoor fan See basic operation Lo (sleep)…

–0.66˚C –1.33˚C + Delay Notes: (1) If the room temperature is (cooling preset temperature) - (1.33°C) or less after 30 seconds from starting the operation, the operation is done assuming as the preset temperature = (room temperature at the time) - (2°C). (2) The indoor fan is operated in the “Lo”…

Table 3 ∆TWMAX

Basic Heating Operation 2 2.33 2135 min–1 2300 min–1 2.66 2465 min–1 3 3.33 2635 min–1 2800 min–1 3.66 4 2965 min–1 3135 min–1 4.33 4.66 3300 min–1 3465 min–1 5 3635 min–1 5.33 5.66 3800 min–1 3965 min–1 6 6.33 4135 min–1 4300 min–1 6.66 7 4465 min–1 4635 min–1 7.33 4800 min–1 7.66 8 4965 min–1 5135…

TDF

TDF TDF TDF TDF 1 min TDF WMIN Setting Defrosting Inhibit Period Time DFTIM3 DFTIM2 Notes: (1) The sleep operation starts when the sleep key is pressed. (2) When the sleep key is set, the maximum compressor speed is limited to WSTD+2000/2, and the indoor fan is set to “sleep Lo”. (3) 30 minutes…

REFRIGERATING CYCLE DIAGRAM

MODEL RAD-18NH7A RAD-25NH7A/RAC-25NH5 RAD-35NH7A/RAC-35NH5 COOLING, DEHUMIDIFYING, DEFROSTING OUTDOOR UNIT COMPRESSOR SERVICE VALVE (3/8) INDOOR UNIT SINGLE-ENDED UNION (3/8) SUCTION TANK REVERSING VALVE ELECTRIC EXPANSION VALVE SERVICE VALVE (1/4) SINGLE-ENDED UNION (1/4) STRAINER STRAINER CHARGING…

REFRIGERATING CYCLE DIAGRAM

MODEL RAD-50NH7A RAC-50NH5 COOLING, DEHUMIDIFYING, DEFROSTING OUTDOOR UNIT COMPRESSOR SERVICE VALVE (1/2) INDOOR UNIT SINGLE-ENDED UNION (1/2) 12.7 SUCTION TANK REVERSING VALVE ELECTRIC EXPANSION VALVE SERVICE VALVE (1/4) STRAINER SINGLE-ENDED UNION (1/4) STRAINER HEATING SERVICE VALVE (1/2)…

1. Receiver Circuit

5V R419 Wireless input R611 Light receiving unit 13 C611 C405 0V Microcomputer 0V 0V Fig. 1-1 ● The light receiver unit receives the infrared signal from the wireless remote control (option part). The receiver amplifies and shapes the signal and outputs it. 2. Buzzer Circuit 12V R722 BZ BZ…

3. Room Temperature Thermistor Circuit

● Fig. 3-1 shows the room temperature thermistor circuit. ● The voltage at A depends on the room temperature as shown in Fig. 4-2. 5 5V 4 Microcomputer R305 Voltage at A (V) Room temperature thermistor 62 Room temp. input C302 R301 A 0V 0V 3 2 3-1 Fig. 3-2 4. Heat exchanger temperature thermistor…

5. Initial Setting Circuit (IC401)

● When power is supplied, the microcomputer reads the data in IC401 (E2PROM) 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…

7. Drain pump drive circuit

When cool or dehumidifying operation, pin 58 of the micro computer goes “Hi”, Q333 and Q932 turn on and the drain pump drive. 21V Drain pump motor 3 D932 Micro computer L932 Q933 L933 R931 1 Drain pump 58 BLK CN3 Q932 R932 RED C932 0V 0V 0V Fig. 7-1 8. Drain pump trial run switch 5V R533 R534 52…

10. High static-pressure switch (Full duct type and semi duct type)

Main P.W.B. Fig.sw13-1 Static pressure Normal High Drain pump test drive sw Fig. 10-1 ● For full duct type and semi duct type, set the high to HIGH STATIC-PRESSURE. ● If not set to HIGH, there will be reduction of cooling and heating capacities. 11. Wired remote control receiver circuit ● In wired…

1. Power Circuit

REACTOR C004 C001 VARISTOR1 SURGEABSORBER POWER RELAY DIODE STACK 1 R007 R008 ICP RELAY L2 TB7 TB6 TB8 (D25VB60) b C005 C003 VARISTOR3 C002 a N COIL NF COIL1 C006 25A FUSE L R001 TERMINAL BOARD SPM2 L1 Vd TB10 TB11 TB12 U V W TB2 CT1 0V C009 N1 0V JW6 L002 P1 3A FUSE L001 R010 R002 C014 C012 C015…

This smoothes (averages) the voltage rectified by the diode stacks. <Notes> Smoothing capacitor C501 is not available for model RAC-25NH5 and RAC-35NH5. Smoothing Capacitors SPM2 Fig. 1-2 ● a OV b OV Vd DC voltage (approx. 260-360V during operation) Be careful to avoid an electric shock as a high…

2. Indoor/Outdoor Interface Circuit

● The interface circuit superimposes an interface signal on the DC 35V line supplied from the outdoor unit to perform communications between indoor and outdoor units. This circuit consists of a transmiting circuit which superimposes an interface signal transmit from the microcomputer on the DC 35V…

0.7V

Outdoor HIC Pin 30 0V Pin 29 5V 0V Indoor microcomputer Pin 50 5V 0V Pin 49 5V 0V 35V DC 35V line 100ms. Leader 33ms. 1 frame Fig. 2-2 Voltages Waveforms of indoor / Outdoor Microcomputers (Outdoor to Indoor Communications) Outdoor HIC Pin 30 0V Pin 29 5V 0V Indoor microcomputer Pin 50 5V 0V Pin 49…

7 0 Character No. 0 (33.3ms.) Bit No = 0 Leader (100ms.) 36 (V) 35 (V) 34 (V) [Example] When the outdoor message is all 0s and indoor message is all 1s: (3) Communications waveforms When reset (approx. 10ms.) (2) Indoor microcomputer to outdoor microcomputer (HIC) When reset (approx. 10ms.) (1)…

Capacity code (3 MSB)

Capacity code (2) Capacity code (1) Capacity code (0 LSB) Indoor in-operation bit Operation mode (2 MSB) Operation mode (1) Operation mode (0 LSB) – 66 – 0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 1/0 Fan (0 LSB) Contents Contents Bit No. Character No. (1) Outdoor message […

N

L Terminal board Noise filter coil R008 R007 – 67 – – – C503 C502 C501 C006 R001 – R24 + U– U Fig. 3-1 Power module circuit (U+ is ON, V– is ON) Inrush current protection relay Power relay + Coil + FUSE (25A) + 0.35mH V – V W– W System Power module 2 + + W V U A V coil U coil Fig. 3-1 shows the…

System Power Module 2

260V-360V + U+ V + DC compressor motor U coil A W+ U V W B _ R24 U— V — V coil W— W coil DC current (Id) detection resistor Fig. 3-4 Power module circuit (U+ is ON, V– is ON) ● Since current flows at point B only when U+ transistor is ON, the current waveform at point B becomes intermittent waveform…

(2) During ON

● The drain current at IC901 increases linearly. During this period, the gate voltage and current become constant because of the saturation characteristics of the transformer. (3) Shifting from ON to OFF ● This circuit applies a negative feedback signal from the 12V output. When the voltage across…

5. Reversing valve control circuit

I/F 35V 5V Reversing valve CN2 3 HIC FUSE RESISTOR 4 1 D702 PQ701 3 2 R703 Q701 Q705 R701 R219 16 DC voltmeter or tester R702 V 24 MICROCOMPUTER 1 0V I/F 0V Fig. 5 – 1 ● Reversing valve control circuit can switch reversing valve ON/OFF according to instruction from indoor microcomputer depending on…

6. Rotor magnetic pole position detection circuit

[Low speed rotation mode]

8. HIC and Peripheral Circuits

5V

Trip signal synthesis circuit Reset Voltage Reset circuit DC 260V -360V Over-load external setting circuit DC Current level Current amplified circuit Outdoor microcomputer Chopper signal Chopper signal Drive signal Drive Circuit Compressor motor Power module IP signal Peak current cut off circuit…

(2) Overload control circuit (OVL control circuit)

● ● ● Overload control is to decrease the speed of the compressor and reduce the load when the load on the air conditioner increases to an overload state, in order to protect the compressor, electronic components and power breaker. Overloads are judged by comparing the DC current level and set…

Detection Resistor

R24 Direct Current DC Current N1 P2 R500 DC 260-380V SPM2 10 1 CN14 CN13 1 5 + MAIN P.W.B. C205 0V 38 39 HIC 37 7 IC4 60 Id R248 R247 C217 L – + C224 5 + R249 6 R245 0V D204 0V 5V 5V Is CT1 0V + 61 Is 58 0V C218 R221 C105 R006 C009 0V R222 D104 R005 0V IC1 Microcomputer D205 N 0V C222 R253 59 Vd 0V…

R500, R253, detect the DC voltage at the power circuit. The microcomputer receives a DC voltage (260380V) via HIC 37 and applies correction to the overload set value so the DC current is low (high) when the DC voltage is high (low). (Since the load level is indicated by the DC voltage multiplied by…

9. Temperature Detection Circuit

HIC +5V O.H. thermistor Normal 2.7V or less Over heat 2.7V or more Reset 2.3V or less 7 CN8 62 O.H. Microcomputer +5V 0V DEF. thermistor Normal 2.4V or more Over heat 2.4V or less Reset 2.9V or more 6 CN9 Outdoor temperature thermistor 63 DEF. +5V 0V Refer to the table 10-1 5 CN10 64 Outdoor…

10. Reset Circuit

Main P.W.B HIC 12V 5V 0V JW10 0V 0V 0V C225 R285 C226 3 R292 C107 + – + 0V R289 1 R252 48 RESET C204 R284 C215 R286 Microcomputer IC5 (1/2) R288 0V Fig. 10-1 ● ● ● 12V line 12 Power is ON Voltage (V) ● The reset circuit initializes the microcomputer program when Power is “ON” or “OFF”. Low voltage…

11. Outdoor DC Fan Motor control circuit

+ + + Smoothing Capacitor System power module U Power supply for DC fan motor from smoothing capacitor in system power module V W RC Filter CN12 Main P.W.B 2A-FUSE Motor coil ONE CHIP DRIVER IC 1 2 C101 3 R115 FM-15V FM-15V 0V 4 R103 R104 + C106 ZD101 C103 R105 R107 Vcc 5 Q101 R101 FG Pulse 7 R102…

< Reference >

● When operation stop with LD301 blinks 12 times, it may be caused by faulty DC fan motor. ● In this case, please check CN6 and CN12 connection first. It makes Fan Motor Lock also if those connectors are in misconnection. ● DC Fan Motor has broken when 2A Fuse was burned. Please replace both DC Fan…

12. Power Factor Control Circuit

Power factor is controlled to almost 100%. (Effective use of power) With IC in ACT module, control is performed so that input current waveform will be similar to waveform of input voltage I (input current) input voltage V (input voltage) Effective voltage area input current Effective voltage area…

Model RAD-18NH7A, RAD-25NH7A, RAD-35NH7A, RAD-50NH7A COOLING MODE Q1 The compressor has stopped suddenly during cooling operation. A1 Check if the indoor heat exchanger is frosted. Wait for 3-4 minutes until it is defrosted. If the air conditioner operates in cooling mode when it is cold, the…

AUTO FRESH DEFROSTING

Q7 A7 After the ON/OFF button is pressed to stop heating, the outdoor unit is still working with the OPERATION lamp lighting. Auto Fresh Defrosting is carried out : the system checks the outdoor heat exchanger and defrosts it as necessary before stopping operation. AUTO OPERATION Q8 Fan speed does…

OTHERS

Q15 Q16 Q17 Q18 Q19 The indoor fan varies among high air flow, low air flow and breeze in the auto fan speed mode. (Heating operation) Loud noise from the outdoor unit is heard when operation is started. Noise from the outdoor unit occasionally changes. There is a difference between the set…

TROUBLE SHOOTING

Model RAC-25NH5, RAC-35NH5, RAC-50NH5 PRECAUTIONS FOR CHECKING System power module 2 Power source 220V-240V N + ACT Module ~ DANGER ~ 1. Remember that the 0V line is biased to 155-170V in reference to the ground level. 2. Also note that it takes about 10 minutes until the voltage fall after the…

DISCHARGE PROCEDURE AND POWER SHUT OFF METHOD FOR POWER CIRCUIT

Caution Voltage of about 300-330V is charged between both ends of smoothing capacitors During continuity check for each part of circuit in indoor unit electrical parts, disconnect red/gray lead wire connected from diode stack to system power module (SPM2) to prevent secondary trouble. (Be sure to…

TROUBLESHOOTING WHEN TIMER LAMP BLINKS

Model RAD-18NH7A, RAD-25NH7A, RAD-35NH7A, RAD-50NH7A Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink. SELF-DIAGNOSIS LIGHTING MODE Model: RAD-18NH7A, RAD-25NH7A, RAD-35NH7A, RAD-50NH7A <Remark> If using wired remote controller, electrical cover…

SELF-DIAGNOSIS LIGHTING MODE

CHECKING THE INDOOR/OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING CYCLE

Model RAC-25NH5 RAC-35NH5 RAC-50NH5 Unit does not operate. Yes Open electrical cover of indoor unit. Timer lamp See Troubleshooting when the timer lamp blinks . Refer page 92. Does the timer lamp on the indoor unit blink? No Remove the terminal cover and check the voltage between terminal (C) and…

CHECKING INDOOR UNIT ELECTRICAL PARTS

1. Power does not come on (no operation) No No Is AC 220-240V AC being generated between terminals L and N on the outdoor unit terminal board? Is DC 35V being generated between terminals C and D on the terminal board? Check AC outlet and breaker, and repair any defective part. Yes Is DC 35V being…

2. Outdoor unit does not operate (but receives remote infrared signal)

3. Only indoor fan does not operate (other is normal)

Is approx 20 V DC generated between pins 2 (blue) and 4 (red) of CN 10 when operated at high fan speed during cooling? Is 5 V DC generated between pins 2 (blue) and 1 (yellow) of CN10? Replace indoor fan motor. No No Are pulses of approx. 33 Vp-p generated at the collectors of Q901 in the fan…

5. All systems stop from several seconds to several minutes after operation is started

(all indicators are also off) Set to the "Hi" fan mode. The operation lamp lights once and goes out in 5-10 seconds. Yes Disconnect, CN10 and set to the fan mode again. The operation lamp lights once and goes out in 5-10 seconds. Yes Check to see if shorting, etc. has occurred in the P.W.B. pattern.…

How did the self-diagnosis lamp (LD301) light? Operate the outdoor unit according to the instruction “How to operate the outdoor unit independently”. Yes Is 5V being generated between Pin 4 (0V) and pin 3 (5V) at CN 18 (test pin)? Yes See the description on power circuit for details. Is the power…

LD301 blinks 9 time. Communication error. Yes Contact terminal Coil terminal Interface relay Is DC 35V being output at terminals C and D? (Normally, DC 33-38.5V is output.) Check the interface curcuit. No Is a voltage (at least 10V) being generated between the contact terminals of interface relay?…

Thermistor abnormal. LD301 blinks 7 time. Acceleration defect. LD301 blinks 8 time. Yes Is the thermistor circuit normal? Yes Is the continuity of thermistor normal? No ❈ The problem may be “forgetting to connect after servicing”. Is the thermistor connector disconnected? Is the drive circuit…

Abnormal low speed. LD301 blinks 3 time. LD301 blinks 4 time. Failure of switching. Is the drive circuit normal? Yes Is the system power module normal? Replace the main P.W.B. Yes Are R503, R541, R542, R549 and peripheral circuits of system power module normal? LD301 blinks 5 time. Overload lower…

POWER CIRCUIT

Phenomenon 1 <Rotation speed does not increase> No Recheck cord, etc. of the system power module. If they are disconnected, connect them securely. Is the DC voltage at least 350V? Yes Is the OVL lamp lit? If the lamp is lit, it does not indicate fault, but the unit is overload status. If abnormality…

CHECKING THE REFRIGERATING CYCLE

(JUDGING BETWEEN GAS LEAKAGE AND COMPRESSOR DEFECTIVE) 1. Troubleshooting procedure (No operation, No heating, No cooling) Lighting mode Connect U,V,W phase leads to the power module again and operate the air conditioner. Blinks Blinks Blinks Blinks Blinks Blinks 2 times 3 times 4 times 5 times 6…

HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT

MODEL RAC-25NH5, RAC-35NH5, RAC-50NH5 1. Turn off the power supply to outdoor unit and then turn on again. 2. Remove the electrical box cover. LD303 (red) will light and the unit will operate in the forced cooling mode at this time. Never operate the unit for more than 5 minutes. Service switch…

SYSTEM POWER MODULE DIAGNOSIS

Circuit diagram of the device (excepting the reflux diode) Collector BASE Emitter + Circuit diagram of the module PGU PGV PGW U V W NGU NGV NGW – P1 N1 P2 U Terminals symbol mark of the module See next page for measuring value using tester L2 L1 + – – 106 – W V

HOW TO CHECK SYSTEM POWER MODULE

Checking system power module using tester Set tester to resistance range (X 100) If indicator does not swing in the following conductivity check, the system power module is normal. (In case of digital tester, since built-in battery is set in reverse direction, + and – terminals are reversed.)…

PARTS LIST AND DIAGRAM

PART N0

RAD-25NH7A

RAD-35NH7A

RAD-50NH7A

OUTDOOR UNIT

RAC-25NH5

PART N0. RAC-25NH5 Q’TY / UNIT PARTS NAME 2 PMRAC-25NH4 S08 1 COMPRESSOR 3 KPNT1 001 6 PUSH NUT 4 RAC-2226H 805 3 COMPRESSOR RUBBER 5 PMRAC-25NH4 S01 1 CONDENSER 6 PMRAC-50YHA1 905 1 REVERSING VALVE 7 PMRAC-25NH4 S03 1 ELECTRICAL EXPANSION COIL 8 PMRAC-25NH4 S04 1 VALVE (2S) 9 PMRAC-25NH4 S05 1…

RAC-35NH5

PART N0. RAC-35NH5 Q’TY / UNIT PARTS NAME 2 PMRAC-25NH4 S08 1 COMPRESSOR 3 KPNT1 001 6 PUSH NUT 4 RAC-2226H 805 3 COMPRESSOR RUBBER 5 PMRAC-25NH4 S01 1 CONDENSER 6 PMRAC-50YHA1 905 1 REVERSING VALVE 7 PMRAC-25NH4 S03 1 ELECTRICAL EXPANSION COIL 8 PMRAC-25NH4 S04 1 VALVE (2S) 9 PMRAC-25NH4 S05 1…

RAC-50NH5

PART N0. RAC-50NH5 Q’TY / UNIT PARTS NAME 2 PMRAC-50NH4 S07 1 COMPRESSOR 3 KPNT1 001 4 PUSH NUT 4 RAC-2226HV 805 3 COMPRESSOR RUBBER 5 PMRAC-50NH4 S02 1 CONDENSER 6 PMRAC-50YHA1 905 1 REVERSING VALVE 7 PMRAC-25NH4 S03 1 ELECTRICAL EXPANSION COIL 8 PMRAC-50NH4 S03 1 VALVE (2S) 9 PMRAC-50NH4 S04 1…

HITACHI

Инструкция на Кондиционеры Hitachi серии MULTIZONE RAD...NH.../RAC...NH...

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