Hitachi RAD-25NH4 User Manual

NO. 0214E
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
JUNE 2004 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)
RAD-25NH4 RAC-25NH4
DC INVERTER (CEILING CASSETTE TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS
750
235
400
19
RAD-25NH4
RAD-40NH4
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 ------------------------------------------------------------------ 39
BASIC MODE ------------------------------------------------------------------------ 41
REFRIGERATING CYCLE DIAGRAM ---------------------------------------- 55
AUTO SWING FUNCTION ------------------------------------------------------- 57
DESCRIPTION OF MAIN CIRCUIT OPERATION ------------------------ 58
SERVICE CALL Q & A ----------------------------------------------------------- 89
TROUBLE SHOOTING ------------------------------------------------------------ 92
PARTS LIST AND DIAGRAM ------------------------------------------------- 112
RAD-25NH4/RAC-25NH4
RAD-40NH4/RAC-50NH4
RAC-25NH4
RAC-50NH4
COOLING
HEATING
INDOOR UNIT
OUTDOOR UNIT INDOOR UNIT
OUTDOOR UNIT
1 PHASE, 50 Hz, 220-240V
720 (220~980)
3.31-3.03
2.50 (1.00 ~ 3.00)
8,540
1,000 (210 ~ 1,280)
4.59-4.21
3.80 (1.10 ~ 4.80)
12,980
750
570
280
38
750
235
400
19
850
650
298
60
1 PHASE, 50 Hz, 220-240V
1,400 (220~1,560)
6.43-5.89
4.00 (1.00 ~ 4.50)
13,660
1,770 (210 ~ 1,920)
8.13-7.45
5.20 (1.10 ~ 5.80)
17,750
RAD-40NH4 RAC-50NH4

Hitachi RAD-25NH4 Specifications

General

Brand	Hitachi
Model	RAD-25NH4
Category	Air Conditioner
Language	English

Summary

SAFETY DURING REPAIR WORK

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

Items to be observed in handling

Details essential practices for handling sensitive electronic parts, including grounding and containers.

CAUTION

SPECIFICATIONS

MAINTENANCE

1. AIR FILTER

Steps for cleaning the air filter to ensure efficient operation and air quality.

MAIN PARTS COMPONENT

WIRING DIAGRAM

CIRCUIT DIAGRAM

BLOCK DIAGRAM

REFRIGERATING CYCLE DIAGRAM

DESCRIPTION OF MAIN CIRCUIT OPERATION

Power Circuit

Power Module Circuit

SERVICE CALL Q & A

COOLING MODE

DEHUMIDIFYING MODE

HEATING MODE

TROUBLE SHOOTING

PRECAUTIONS FOR CHECKING

Important safety precautions to take before and during troubleshooting procedures.

CHECKING THE INDOOR/OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING CYCLE

TROUBLESHOOTING WHEN TIMER LAMP BLINKS.

SELF-DIAGNOSIS LIGHTING MODE

Explains self-diagnosis codes indicated by blinking patterns for fault identification.

PARTS LIST AND DIAGRAM INDOOR UNIT

OUTDOOR UNIT MODEL : RAC-25NH4, RAC-50NH4