Hitachi RAF25NH4 User manual

SM0757
RAM70QH4
(MULTIZONE 70H)
RAM80QH4
(MULTIZONE 80H)
RAF25NH4
RAF50NH4
RAD25QH4
RAD40QH4
SERVICE MANUAL
TECHNICAL INFORMATION
INFORMATIONS TECHNIQUES
REFER TO THE FOUNDATION MANUAL
REPORTEZ-VOUS AU MANUEL DE BASE
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LES SPECIFICATIONS ET PIECES DETACHEES PEUVENT CHANGER POUR ETRE AMELIOREES.
FOR SERVICE PERSONNEL ONLY
RESERVE AU PERSONNEL
SPECIFICATIONS
CARACTERISTIQUES GENERALES
SPECIFICATIONS 8
CARACTERISTIQUES GENERALES
FEATURES 28
CARACTÉRISTIQUES
HOW TO USE 44
UTILISATION
INSTALLATION 72
INSTALLATION
CONSTRUCTION AND DIMENSIONAL DIAGRAM 76
DIMENSIONS DES UNITÉS
MAIN PARTS COMPONENT 84
PRINCIPAUX COMPOSANTS
WIRING DIAGRAM 86
SCHÉMAS ÉLECTRIQUES
WIRING DIAGRAM OF THE PRINTED WIRING BOARD 93
SCHÉMA ÉLECTRIQUE DU CIRCUIT IMPRIMÉ
BLOCK DIAGRAM 111
ORGANIGRAMME DE CONTROLE
BASIC MODE 115
MODE DE BASE
REFRIGERATING CYCLE DIAGRAM 164
SCHÉMA DU CYCLE DE RÉFRIGÉRATION
DESCRIPTION OF MAIN CIRCUIT OPERATION 183
DESCRIPTION DES PRINCIPAUX CIRCUITS ÉLECTRIQUES
SERVICE CALL Q&A 236
MODE OPERATOIRE DE DEPANNAGE
DISASSEMBLY AND REASSEMBLY 244
DEMONTAGE ET REMONTAGE
TROUBLE SHOOTING 256
DETECTION DES PANNES
PARTS LIST AND DIAGRAM 302
LISTE DES PIÉCES DE RECHANGE ET DIAGRAMME
CONTENTS
TABLE DES MATIERES
TYPE TYPE
MODEL MODÈLE
POWER SOURCE PHASE/TENSION/FREQUENCE
TOTAL INPUT PUISSANCE ABSORBEE TOTALE (W)
TOTAL AMPERES AMPERES TOTAUX (A)
CAPACITY CAPACITE (kW)
(B.T.U./h)
TOTAL INPUT PUISSANCE ABSORBEE TOTALE (W)
TOTAL AMPERES AMPERES TOTAUX (A)
CAPACITY CAPACITE (kW)
(B.T.U./h)
W, L
DIMENSIONS DIMENSIONS (mm) H, H
D, P
NET WEIGHT POIDS NET (kg)
DC INVERTER TRIPLE AND QUADRUPLE SYSTEM MULTI
SYSTEME DE TRIPLE ET QUADRUPLE ONDULEUR CC MULTI
INDOOR UNIT UNITÉ INTÉRIEURE OUTDOOR UNIT UNITÉ EXTÉRIEURE
750
600
215
15.0
750
235
400
14.0 77 79
1ø, 230V, 50Hz
RAF25NH4 RAF50NH4
REFER TO THE SPECIFICATIONS PAGE 10.
REPORTEZ-VOUS AUX SPECIFICATIONS DE LA PAGE 11.
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
APRIL 2003 Hitachi Home & Life Solutions, Inc.
RAD25QH4
RAD40QH4
û
CH
RAF25NH4
RAF50NH4
RAM70QH4
RAM80QH4
COOLING
RÉFRIGÉRATION
HEATING
CHAUFFAGE
RAD25QH4 RAD40QH4 RAM70QH4 RAM80QH4
*After installation Après installation
850 (+90)*
830
340 (+50)*

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.
3. fter completion of repairs, the initial state should be
restored.
4. Lead wires should be connected and laid as in the
initial state.
5. Modification of the unit by the user himself should
absolutely be prohibited.
6. Tools and measuring instruments for use in repairs or inspection should be accurately calibrated in
advance.
7. In installing the unit having been repaired, be careful to prevent the occurrence 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 insulation resistance should be 1M Ω or more as measured by a 500V DC megger.
9. The initial location of installation such as window, floor or the other should be checked for being safe
enough to support the repaired unit again.
If it is found not so strong and safe, the unit should be installed at the initial location after reinforced or
at a new location.
10. ny inflammable object must not be placed
about the location of installation.
11. Check the grounding to see whether it is
proper or not, and if it is found improper,
connect the grounding terminal to the earth.
Spray
gasoline
gasbombe
thinner
   
If the contacts of electrical
parts are defective, replace
the electrical parts without
trying to repair them
1
2
3
4
5
DANGER

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 
The standards provide for items to be generally observed in carrying and handling semiconductors in
relative manufactures during maintenance and handling thereof. (They apply the same to handling of
abnormal goods such as rejected goods being returned.)
  
(1) Micro computer
(2) Integrated circuits (I.C.)
( ) Field effective transistor (F.E.T.)
(4) P.C. boards or the like to which the parts mentioned in (1) and (2) of this paragraph are equipped.
! "    #$ %& '&$(%&)
(1) Use a conductive container for carrying and storing of parts. (Even rejected goods should be handled in
the same way.)
(2) When any part is handled uncovered (in counting, packing and the like), the handling person must
always use himself as a body earth. (Make yourself a body earth by passing one M ohm earth
resistance through a ring or bracelet.)
( ) Be careful not to touch the parts with your clothing when you hold a part even if a body earth is
being taken.
(4) Be sure to place a part on a metal plate with grounding.
(5) Be careful not to fail to turn off power when you repair the printed circuit board. At the same time,
try to repair the printed circuit board on a grounded metal plate.
HITACHII
C401TH1 ,188 UV
%)  &$*%# &%&
A conductive polyvinyl bag
IC
IC
Conductive sponge
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Body earth (Elimik conductive band)
Clip for connection with
a grounding wire
1M Ω

Ð4Ð
(6) Use a three wire type soldering iron including a grounding wire.
    
Use a high insulation mode (100V, 10M Ω or higher) when ordinary iron is to be used.
( ) 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.
Bare copper wire (for body earth) Metal plate (of Al. stainless steel, etc.)
Working table
Resistor 1M Ω (1/2W)
Earth wirte
Staple
     
soldering iron
Grounding wire
Screw stop at the screwed
part using a rag plate

Ð6Ð
1. In quiet operation or stopping the running, its heard slight flowing noise of
refrigerant in the refrigerating cycle 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 outlet for safety.
3. The room air conditioner dose not start automaticaly after reco ery of the electric
power failure for pre enting fuse blowing. Re-press START / STOP button after 3
minutes from when unit stopped.
4. If the room air conditioner is stopped by adjusting thermostat, or missoperation, and
re-start in a moment, there is occasion that the cooling 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 e en if operation is restarted accidentally.
5. This room air conditioner should not be used at the cooling operation when the
outside temperature is below 10ûC (50ûF).
6. This room air conditioner (the re erse cycle) should not be used when the outside
temperature is below Ð15ûC (5ûF).
If the re erse cycle is used under this condition, the outside heat exchanger is
frosted and efficiency falls.
7. When the outside heat exchanger is frosted, the front is melted by operating the
hot gas system, it is not trouble that at this time fan stops and the apour may
rise from the outside heat exchanger.
CAUTION


SPECIFICATIONS
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Ð10Ð
SPECIFICATION OF ROOM AIR CONDITIONER
RAF-25NH4 RAF-50NH4 RAD-25QH4 RAD-40QH4 RAM-70QH4 RAM-80QH4
STANDARD
CE(EMC&LVD)
INDOOR UNIT RAF-25NH4 RAF-50NH4 RAD-25QH4 RAD-40QH4
OUTDOOR UNIT 1.0HP 2.0HP 1.0HP 1.5HP
CAPACIT (kW) 2.5(1.0 〜 2.8) 5.0(1.0 〜 5.6) 2.5(1.0 〜 2.8) 4.0(1.0 〜 4.5)
COOLING (BTU/h) 8525(3410 〜 9550)
17050(3410 〜 19100) 8525(3410 〜 9550) 13640(3410 〜 15345)
TOTA LINPUT(W) 780(360 〜 980) 1910(360 〜 2100) 780(360 〜 980) 1340(360 〜 1480)
(ONE UNIT) COP 3.21 2.62 3.21 2.99
TOTA LAMPERES(A) 3.4 8.4 3.4 5.9
POWER FACTOR(%) 99 99 99 99
SOUND LEVEL(INDOOR) 35 44 40 43
AIR FLOW VOLUME(Hi) 7.4 m
3
/min 10.3 m
3
/min 8.7 m
3
/min 9.0 m
3
/min
COOLING CAPACIT (kW)
(3 & 4 UNITS)
(BTU/h)
RAF-25NH4 × 3 TOTA LINPUT(W)
… RAM-70QH4 COP
TOTA LAMPERES(A)
RAF-25NH4 × 4 POWER FACTOR(%)
… RAM-80QH4 SOUND LEVEL(OUTDOOR)
CAPACIT (kW) 3.9(1.1 〜 4.7) 6.7(1.1 〜 7.6) 3.9(1.1 〜 4.7) 6.0(1.1 〜 6.8)
HEATING (BTU/h) 13300(3750 〜 14660)
22847(3750 〜 25920) 13300(3750 〜 14660) 20460(3750 〜 23190)
TOTA LINPUT(W) 1100(320 〜 1280) 2070(320 〜 2170) 1100(320 〜 1280) 1770(320 〜 1920)
(ONE UNIT) COP 3.55 3.24 3.55 3.39
TOTA LAMPERES(A) 4.8 9.1 4.8 7.8
POWER FACTOR(%) 99 99 99 99
SOUND LEVEL(INDOOR) 35 44 41 43
AIR FLOW VOLUME(Hi) 8.5 m
3
/min 12.3 m
3
/min 9.0 m
3
/min 9.5 m
3
/min
HEATING CAPACIT (kW)
(3 & 4 UNITS)
(BTU/h)
RAF-25NH4 × 3 TOTA LINPUT(W)
… RAM-70QH4 COP
TOTA LAMPERES(A)
RAF-25NH4 × 4 POWER FACTOR(%)
… RAM-80QH4 SOUND LEVEL(OUTDOOR)
ES ES ES ES
3333
ES(WIRELESS) ES(WIRELESS) ES(WIRELESS) ES(WIRE LESS)
RAF-25NH4,50NH4 RAD-25QH4,40QH4 RAM-70QH4 RAM-80QH4
W 29-17/32(750) 29-17/32(750)
DIMENSIONS H 35-5/8(600) 9-1/4(235)
inches(mm) D 8-15/32(215) 15-3/4(400)
(INSTALLED) - -
15 14 77 79
W 31-3/8(797) 31-23/32(806)
PACKING H 25-13/16(656) 12-1/16(306)
inches(mm) D 10-15/16(278) 23-3/8(594)
cu.ft 5.13 5.17
17 16 81 83
6.35/9.52 6.35/12.7
6.35/9.52
33-1/2(850)
32-11/16(830)
15-17(390)
CONSOLE FREE DUCT
10.9
99 99
COOLING/HEATING
NOT PROVIDED(POWER CORD SHOULD BE PREPARED AND
FLARE NUT SIZE(SMALL/LARGE)
NET WEIGHT (kg)
T PE
MODEL
CLASS
REMOTE CONTROL SWITCH
MAXIMUM LENGTH OF PIPING
PHESE/VOLTAG E/FREQUENC
AUTOMATIC AIR DEFLECTORS
FAN SPEED
1 φ 230V 50Hz
RAM-70QH4 RAM-80QH4
7.0(3.0 〜 7.9)
23870(10230 〜 26260)
2180(650 〜 3180)
8.0(3.0 〜 9.2)
27280(10230 〜 30690)
GROSS WEIGHT(kg)
LINE CORD
MAX60m(THREE UNITS TOTAL) MAX70m(FOUR UNITS TOTAL)
MODEL
-
13.31
CONNECTED TO OUTDOOR UNIT WHEN INSTALLED)
39-1/4(997)
34-21/32(880)
6.35/9.52
3.21
9.6
48
99 99
49
16-15/16(430)
51 51
11.0(3.0 〜 12.4)
37530(10230 〜 42310)
2480(620 〜3520)
û
CH
9.6(3.0 〜 10.6)
32760(10230 〜 36170)
2630(620 〜 3630)
3.87 4.18
3.02
11.6
2650(650 〜 3200)
11.6

Ð12Ð
COOL / HEAT CAPACITY SPEC. FOR INDOOR UNITS
COMBINATIONS
TO BE ABLE TO OPERATE SIMULTANEOUSLY
TRIPLE SYSTEM MULTI R.A.C.
MULTIZONE 70H
Whichever in oor units are installe , cooling an heating capacity
epen s on how many an which in oor units are operating at that time.
MODEL:ＲＡＭ―７０ＱＨ４

CAPACITY POWER AMPERE(A) CAPACITY POWER AMPERE(A)
RATING（kW）

CONSUMPTION ２３０Ｖ
RATING（kW）

CONSUMPTION ２３０Ｖ

（RANGE）

（Ｗ）

（RANGE）

（Ｗ）

2.5 2.50 780 3.4 3.90 1100 4.8
(1.00〜2.80) (360〜980) (1.10〜4.70) (320〜1,280)
ONE 3.5 3.50 1160 5.1 4.80 1380 6.1
UNIT (1.00〜3.90) (360〜1,280) (1.10〜5.80) (320〜1,750)
4.0 4.00 1340 5.9 6.00 1770 7.8
(1.00〜4.50) (360〜1,480) (1.10〜6.80) (320〜1,920)
5.0 5.00 1910 8.4 6.70 2070 9.1
(1.00〜5.60) (360〜2,100) (1.10〜7.60) (320〜2,170)
2.5+2.5 2.50+2.50 1560 6.9 3.90+3.90 2290 10.1
◇

(1.50〜5.60) (640〜1,720) (1.50〜8.60) (600〜2,520)
TWO 2.5+3.5 2.50+3.50 1990 8.7 3.90+4.80 2690 11.8
UNITS (1.50〜6.60) (640〜2,190) (1.50〜9.60) (600〜2,960)
2.5+4.0 2.50+4.00 2220 9.7 3.50+5.50 3200 14.1
(1.50〜7.00) (640〜2,440) (1.50〜9.90) (600〜3,520)
2.5+5.0 2.50+4.50 2580 11.3 3.00+6.00 3200 14.1
(1.50〜7.60) (640〜2,840) (1.50〜9.90) (600〜3,520)
3.5+3.5 3.50+3.50 2580 11.3 4.70+4.70 3200 14.1
(1.50〜7.60) (640〜2,840) (1.50〜10.30) (600〜3,520)
3.5+4.0 3.30+3.70 2580 11.3 4.50+4.90 3200 14.1
(1.50〜7.60) (640〜2,840) (1.50〜10.30) (600〜3,520)
3.5+5.0 2.90+4.10 2580 11.3 3.90+5.50 3200 14.1
(1.50〜7.60) (640〜2,840) (1.50〜10.30) (600〜3,520)
4.0+4.0 3.50+3.50 2580 11.3 4.70+4.70 3200 14.1
(1.50〜7.60) (640〜2,840) (1.50〜10.30) (600〜3,520)
4.0+5.0 3.10+3.90 2580 11.3 4.20+5.20 3200 14.1
(1.50〜7.60) (640〜2,840) (1.50〜10.30) (600〜3,520)
2.5+2.5 2.50+2.50 1660 7.3 2.90+2.90 1580 6.9
◆

(1.50〜5.50) (640〜1830) (1.50〜6.40) (600〜1,740)
TWO 2.5+3.5 2.30+3.30 1860 8.2 2.60+3.60 1930 8.5
UNITS (1.50〜6.20) (640〜2,050) (1.50〜6.80) (600〜2,120)
2.5+4.0 2.20+3.40 1860 8.2 2.40+3.80 1930 8.5
(1.50〜6.20) (640〜2,050) (1.50〜6.80) (600〜2,120)
3.5+3.5 2.80+2.80 1860 8.2 3.10+3.10 1930 8.5
(1.50〜6.20) (640〜2,050) (1.50〜6.80) (600〜2,120)
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
ＣＯＭＢＩＮＡＴＩＯＮＳ

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

Ð14Ð
RATING CONDITION (DRY BULB / WET BULB)
COOLING
HEATING
INDOOR
27/19 ℃
20 / −℃
OUTDOOR
35 / −℃
7/ 6℃
CAPACITY POWER AMPERE(A) CAPACITY POWER AMPERE(A)
RATING（kW）

CONSUMPTION ２３０Ｖ
RATING（kW）

CONSUMPTION ２３０Ｖ

（RANGE）

（Ｗ）

（RANGE）

（Ｗ）

2.5+2.5+2.5 2.33+2.33+2.33 2180 9.6 3.20+3.20+3.20 2480 10.9
(3.00〜7.90) (650〜3,180) (3.00〜10.60) (620〜3,520)
THREE 2.5+2.5+3.5 2.05+2.05+2.90 2180 9.6 2.80+2.80+4.00 2480 10.9
UNITS (3.00〜7.90) (650〜3,180) (3.00〜10.60) (620〜3,520)
2.5+2.5+4.0 1.95+1.95+3.10 2180 9.6 2.60+2.60+4.40 2480 10.9
(3.00〜7.90) (650〜3,180) (3.00〜10.60) (620〜3,520)
2.5+2.5+5.0 1.75+1.75+3.50 2180 9.6 2.35+2.35+4.90 2480 10.9
(3.00〜7.90) (650〜3,180) (3.00〜10.60) (620〜3,520)
2.5+3.5+3.5 1.80+2.60+2.60 2180 9.6 2.53+3.53+3.53 2480 10.9
(3.00〜7.90) (650〜3,180) (3.00〜10.60) (620〜3,520)
2.5+3.5+4.0 1.75+2.45+2.80 2180 9.6 2.40+3.40+3.80 2480 10.9
(3.00〜7.90) (650〜3,180) (3.00〜10.60) (620〜3,520)
2.5+3.5+5.0 1.60+2.20+3.20 2180 9.6 2.10+3.10+4.40 2480 10.9
(3.00〜7.90) (650〜3,180) (3.00〜10.60) (620〜3,520)
2.5+4.0+4.0 1.70+2.65+2.65 2180 9.6 2.20+3.70+3.70 2480 10.9
(3.00〜7.90) (650〜3,180) (3.00〜10.60) (620〜3,520)
3.5+3.5+3.5 2.33+2.33+2.33 2180 9.6 3.20+3.20+3.20 2480 10.9
(3.00〜7.90) (650〜3,180) (3.00〜10.60) (620〜3,520)
3.5+3.5+4.0 2.20+2.20+2.60 2180 9.6 3.10+3.10+3.40 2480 10.9
(3.00〜7.90) (650〜3,180) (3.00〜10.60) (620〜3,520)
◇ Twounits Eachunitisconnectedtoeachcompressor.
◆ Twounits Twounitareconnectedtoonecompressor.
ＣＯＯＬＩＮＧ

ＨＥＡＴＩＮＧ

ＰＯＳＳＩＢＬＥ

ＣＯＭＢＩＮＡＴＩＯＮＳ

ＴＯ ＯＰＥＲＡＴＥ


Ð16Ð
COOLING HEATING COOLING HEATING
1.00〜2.80 1.10〜4.70 11〜17 15〜18
1.00〜2.80 1.10〜4.70 11〜17 15〜18
1.00〜4.50 1.10〜6.80 18〜28 22〜27
1.00〜5.60 1.10〜7.60 23〜34 24〜30
NO.1 NO.2 NO.3
6.35/9.52D 6.35/9.52D 6.35/9.52D
2.5+2.5 2.5 --- 2.5
2.5+3.5 2.5 --- 3.5
TWO 2.5+4.0 2.5 --- 4.0
UNITS 2.5+5.0 2.5 --- ☆5.0
3.5+3.5 3.5 --- 3.5
3.5+4.0 3.5 --- 4.0
3.5+5.0 3.5 --- ☆5.0
4.0+4.0 --- 4.0 4.0
4.0+5.0 --- 4.0 ☆5.0
2.5+2.5 2.5 2.5 ---
2.5+3.5 2.5 3.5 ---
2.5+4.0 2.5 4.0 ---
3.5+3.5 3.5 3.5 ---
2.5,3.5,4.0,5.0meansindoorunitscoolingcapacityclass.
SUITABLEROOMSIZE( m2 )
ATONEUNITOPERATION
(kW)
2.5
NOMINAL
COOLINGCAPACITY
CAPACITY(kW)
ATONEUNITOPERATION
INDOOR
UNIT
MODEL
RAD-25QH4
(ｍ

2)
CONNECTINGPOSITIONON
OUTDOORUNIT
(VALVEDIAMETER)(mm)
RAF-25NH4
RAD-40QH4
RAF-50NH4
2.5
5.0
4.0
(11〜14)+(16〜20)
(11〜14)+(18〜22)
POSSIBLE SUITABLE
COMBINATIONS ROOMSIZE
TOINSTALL TOINSTALL
(12〜15)+(12〜15)
(12〜15)+(14〜18)
(14〜18)+(14〜18)
(14〜18)+(14〜18)
(13〜17)+(16〜20)
(13〜16)+(18〜22)
(16〜20)+(16〜20)
(16〜20)+(18〜22)
(12〜15)+(12〜15)
(12〜15)+(14〜18)
(11〜14)+(16〜20)
Twoorthreeindoorunitscanbeinstalledwithoneoutdoorunit,
whilehtreeisdesirable.
Andtotalnominalcooloingcapacityshouldnotbemorethan11.0kW.
   
  
    
