Hitachi RAD-25NH7 - Service Manual

NO. 0366E
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
APRIL 2007 Refrigeration & Air-Conditioning Division
SERVICE MANUAL
PM
REFER TO THE FOUNDATION MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
DC INVERTER (DUCT TYPE)
TYPE
MODEL
POWER SOURCE
TO TAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS
750
235
400
19
RAD-18NH7
RAD-25NH7
RAD-35NH7
RAD-50NH7
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 4
HOW TO USE ------------------------------------------------------------------------ 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 24
MAIN PARTS COMPONENT --------------------------------------------------- 27
WIRING DIAGRAM ---------------------------------------------------------------- 29
CIRCUIT DIAGRAM --------------------------------------------------------------- 31
BLOCK DIAGRAM ----------------------------------------------------------------- 37
BASIC MODE ----------------------------------------------------------------------- 39
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 53
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 55
SERVICE CALL Q & A ---------------------------------------------------------- 87
TROUBLE SHOOTING ----------------------------------------------------------- 90
PARTS LIST AND DIAGRAM ------------------------------------------------- 110
RAD-18NH7
RAD-25NH7/RAC-25NH5
RAD-35NH7/RAC-35NH5
RAD-50NH7/RAC-50NH5
RAC-25NH5
RAC-35NH5
RAC-50NH5
COOLING
HEATING
OUTDOOR UNIT INDOOR UNIT
750
235
400
19
850
650
298
60
1 PHASE, 50 Hz, 220-240V
2,000 (155-2,060)
9.20-8.40
5.0 (0.9 ~ 5.6)
17,070 (3,070-19,120)
2,300 (155-2,530)
10.60-9.70
6.0 (0.9 ~ 7.5)
20,490 (3,070-25,610)
RAD-50NH7 RAC-50NH5
OUTDOOR UNIT INDOOR UNIT
RAD-35NH7 RAC-35NH5
OUTDOOR UNIT INDOOR UNIT
RAD-25NH7 RAC-25NH5
INDOOR UNIT
RAD-18NH7
1 PHASE, 50 Hz, 220-240V
1,240 (155-1,280)
5.70-5.24
3.50 (0.9 ~ 4.0)
11,950 (3,070-13,660)
1,700 (155-1,920)
7.84-7.19
4.80 (0.9 ~ 6.6)
16,390 (3,070-22,530)
1 PHASE, 50 Hz, 220-240V
695 (155-1,050)
3.20-2.92
2.50 (0.9 ~ 3.0)
8,540 (3,070-10,240)
970 (155-1,400)
4.50-4.10
3.50 (0.9 ~ 5.0)
11,950 (3,070-17,070)
1 PHASE, 50 Hz, 220-240V
560 (155-850)
2.56-2.35
1.80 (0.9 ~ 2.5)
6,150 (3,070-8,540)
690 (155-1,050)
3.20-2.92
2.50 (0.9 ~ 3.2)
8,540 (3,070-10,930)
750
570
280
38
750
235
400
19
750
570
280
38
750
235
400
19