Hitachi RAK-25NH4 User Manual

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
MAY 2003 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)
RAK-25NH4 RAC-25NH4
DC INVERTER (WALL TYPE)
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
CAPACITY
TOTAL INPUT
TOTAL AMPERES
CAPACITY
DIMENSIONS
(mm)
NET WEIGHT
SPECIFICATIONS
860
285
183
9.0
RAK-25NH4
RAK-35NH4
RAK-50NH4
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 5
HOW TO USE ------------------------------------------------------------------------ 6
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 29
MAIN PARTS COMPONENT--------------------------------------------------- 31
WIRING DIAGRAM ---------------------------------------------------------------- 33
CIRCUIT DIAGRAM --------------------------------------------------------------- 35
PRINTED WIRING BOARD LOCATION DIAGRAM --------------------- 41
BLOCK DIAGRAM ----------------------------------------------------------------- 43
BASIC MODE ----------------------------------------------------------------------- 45
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 59
AUTO SWING FUNCTION------------------------------------------------------ 61
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 62
SERVICE CALL Q & A ---------------------------------------------------------- 93
TROUBLE SHOOTING ----------------------------------------------------------- 96
PARTS LIST AND DIAGRAM ------------------------------------------------- 116
RAK-25NH4/RAC-25NH4
RAK-35NH4/RAC-35NH4
RAK-50NH4/RAC-50NH4
RAC-25NH4
RAC-35NH4
RAC-50NH4
COOLING
HEATING
INDOOR UNIT
OUTDOOR UNIT INDOOR UNIT
OUTDOOR UNIT
1 PHASE, 50 Hz, 220-230V
695 (155~1,050)
3.20-3.05
2.50 (0.90 ~ 3.00)
8,540
900 (115 ~ 1,400)
4.15-4.00
3.50 (0.90 ~ 5.00)
11,950
750
570
280
38
860
285
183
9.0
750
570
280
38
1 PHASE, 50 Hz, 220-230V
1,080 (155~1,280)
4.94-4.72
3.50 (0.90 ~ 4.00)
11,950
1,320 (115 ~ 1,920)
6.04-5.77
4.80 (0.90 ~ 6.60)
16,390
After installation
OUTDOOR UNIT INDOOR UNIT
860
285
183
9.0
850
650
298
60
1 PHASE, 50 Hz, 220-230V
1,780 (155~2,200)
8.17-7.82
5.00 (0.90 ~ 5.20)
17,070
1,970 (115 ~ 2,100)
9.04-8.65
6.50 (0.90 ~ 8.10)
22,200
RAK-35NH4 RAC-35NH4
RAK-50NH4 RAC-50NH4
NO. 0174E(R)

Hitachi RAK-25NH4 Specifications

General

Type	Split System
Cooling Capacity	2.5 kW
Heating Capacity	2.8 kW
Refrigerant	R410A
Power Supply	220-240V, 50Hz
Noise Level (Outdoor)	50 dB

Summary

SAFETY DURING REPAIR WORK

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

SPECIFICATIONS

SAFETY PRECAUTION

NAMES AND FUNCTIONS OF EACH PART

INDOOR UNIT

Details the physical components and their roles within the indoor air conditioning unit.

MODEL NAME AND DIMENSIONS

Specifies the model names and their corresponding physical dimensions for the indoor units.

NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT

REMOTE CONTROLLER

Explains the features and usage of the wireless remote control for managing the air conditioner's functions.

HEATING OPERATION

DEHUMIDIFYING OPERATION

COOLING OPERATION

HOW TO SET THE TIMER

MAINTENANCE

AIR FILTER

Detailed instructions for cleaning and maintaining the air filter to ensure efficient performance.

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MAIN PARTS COMPONENT

FAN MOTOR

Details the specifications and connection diagram for the fan motor.

WIRING DIAGRAM

CIRCUIT DIAGRAM

Remote Control

Shows the detailed circuit diagram for the remote control's internal electronics and operation.

BLOCK DIAGRAM

BASIC MODE

REFRIGERATING CYCLE DIAGRAM

AUTO SWING FUNCTION

DESCRIPTION OF MAIN CIRCUIT OPERATION

1. Reset Circuit

Explains the function of the reset circuit in initializing the microcomputer upon power changes.

1. Power Circuit

2. Indoor/Outdoor Interface Circuit

3. Power Module Circuit

8. HIC and Peripheral Circuits

(2) Overload control circuit (OVL control circuit)

Explains the overload control mechanism to protect the compressor and system from excessive load.

11. Outdoor DC Fan Motor control circuit.

SERVICE CALL Q & A

TROUBLE SHOOTING

CHECKING THE INDOOR/OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING CYCLE

SELF-DIAGNOSIS LIGHTING MODE

CHECKING INDOOR UNIT ELECTRICAL PARTS

CHECKING THE OUTDOOR UNIT ELECTRICAL PARTS

HOW TO CHECK SYSTEM POWER MODULE

PARTS LIST AND DIAGRAM

INDOOR UNIT

Diagram and parts list detailing the components of the indoor unit.

OUTDOOR UNIT