SM0001
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
DECEMBER
2003
Hitachi Household Appliance (Wuhu) Co., Ltd.
SERVICE MANUAL
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)
RAS25YH4 RAC25YH4
DC INVERTER (WALL TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS
780
280
205
9.5
RAS25YH4
RAS35YH4
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 4
HOW TO USE ----------------------------------------------------------------------- 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 25
MAIN PARTS COMPONENT --------------------------------------------------- 27
WIRING DIAGRAM ---------------------------------------------------------------- 29
CIRCUIT DIAGRAM --------------------------------------------------------------- 31
PRINTED WIRING BOARD LOCATION DIAGRAM --------------------- 37
BLOCK DIAGRAM ----------------------------------------------------------------- 41
BASIC MODE ----------------------------------------------------------------------- 43
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 55
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 56
SERVICE CALL Q & A ---------------------------------------------------------- 84
TROUBLE SHOOTING ----------------------------------------------------------- 87
PROCEDURE FOR DISASSEMBLY AND REASSEMBLY ---------- 113
PARTS LIST AND DIAGRAM ------------------------------------------------ 115
RAS25YH4 / RAC25YH4
RAS35YH4 / RAC35YH4
RAC25YH4
RAC35YH4
COOLING
HEATING
INDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
OUTDOOR UNIT
1 PHASE, 50Hz, 230V
560 (155 ~ 1,080)
2.86
2.50 (0.90 ~ 3.10)
8,530 (3,070 ~ 10,575)
770 (115 ~ 1,120)
3.72
3.40 (0.90 ~ 4.40)
11,601 (3,070 ~ 15,695)
750
548
288
35
780
280
205
9.5
750
548
288
35
1 PHASE, 50Hz, 230V
950 (155 ~ 1,300)
4.35
3.50 (0.90 ~ 4.00)
11,942 (3,070 ~ 13,650)
980 (115 ~ 1,300)
4.49
4.20 (0.90 ~ 5.00)
14,331 (3,070 ~ 17,745)
After installation
RAS35YH4 RAC35YH4