Table of Contents
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SERVICE MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
RAS-50FH7
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
COOLING
CAPACITY
TOTAL INPUT
TOTAL AMPERES
HEATING
CAPACITY
(mm)
NET WEIGHT
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
JANUARY 2010
HITACHI
RAC-50YH7
(W)
(A)
(kW)
(B.T.U./h)
(W)
(A)
(kW)
(B.T.U./h)
W
H
D
(kg)
INDOOR UNIT + OUTDOOR UNIT
Refrigeration & Air-Conditioning Division
PM
RAS-50FH7/RAC-50YH7
REFER TO THE FOUNDATION MANUAL
SPECIFICATIONS ------------------------------------------------------------------- 5
HOW TO USE ------------------------------------------------------------------------ 7
Construction And Dimensional Diagram --------------------- 29
Main Parts Component --------------------------------------------------- 31
Wiring Diagram ---------------------------------------------------------------- 33
Circuit Diagram --------------------------------------------------------------- 35
Printed Wiring Board Location Diagram --------------------- 41
Block Diagram ----------------------------------------------------------------- 44
Basic Mode ----------------------------------------------------------------------- 45
Refrigerating Cycle Diagram --------------------------------------- 59
Auto Swing Function ------------------------------------------------------ 60
Description Of Main Circuit Operation ----------------------- 61
SERVICE CALL Q & A ---------------------------------------------------------- 74
Trouble Shooting ----------------------------------------------------------- 78
Parts List And Diagram -------------------------------------------------- 98
DC INVERTER (WALL TYPE)
INDOOR UNIT
RAS-50FH7
1 PHASE, 50/60 Hz, 220-240V
1,560 (155 ~ 2,200)
7.15 ~ 6.56
5.00 (0.9 ~ 5.2)
17,070 (3,072 ~ 17,754)
1,660 (155 ~ 2,200)
7.60 ~ 7.00
6.00 (0.9 ~ 8.1)
20,480 (3,072 ~ 27,649)
780
280
220
9.5
NO. 0466E
CONTENTS
OUTDOOR UNIT
RAC-50YH7
850
650
298
45
After installation
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Table of Contents
Troubleshooting
Related Manuals for Hitachi RAC-50YH7
Summarization of Contents
SERVICE MANUAL
SPECIFICATIONS
Technical data and parameters for the air conditioning unit.
ELECTRICAL SPECIFICATIONS
Detailed electrical characteristics and ratings of the unit.
SAFETY PRECAUTIONS
REPAIR SAFETY GUIDELINES
Critical safety measures for performing maintenance and repairs.
SEMICONDUCTOR HANDLING PRECAUTIONS
Standards for safe handling and preventing damage to semiconductors.
GENERAL OPERATIONAL SAFETY
Precautions for safe and efficient use of the air conditioner.
UNIT COMPONENTS AND OPERATION
COMPONENT IDENTIFICATION
Names and locations of indoor and outdoor unit parts.
REMOTE CONTROL OPERATION
Instructions for using the remote controller and its functions.
OPERATING MODES
Explanation of different operational modes like Auto, Cool, Heat, Dry.
MAINTENANCE AND SERVICE
AIR FILTER MAINTENANCE
Guidance on cleaning and replacing air filters for optimal performance.
ROUTINE MAINTENANCE AND INSPECTION
Scheduled checks and cleaning for unit longevity and efficiency.
SERVICE AND WARRANTY INFORMATION
Details on after-sale support, warranty, and contacting service.
TECHNICAL INFORMATION
UNIT DIMENSIONAL LAYOUT
Diagrams showing physical dimensions and installation clearances.
KEY COMPONENT SPECIFICATIONS
Detailed technical data for major internal components.
WIRING, CIRCUIT, AND BLOCK DIAGRAMS
Schematics illustrating electrical connections and system flow.
OPERATIONAL ANALYSIS
BASIC OPERATING MODES
Detailed explanation of how the unit functions in different modes.
REFRIGERATION CYCLE SCHEMATICS
Diagrams illustrating the refrigerant flow during operation.
CIRCUIT DESCRIPTIONS
MAIN CIRCUIT OPERATION DETAILS
Description of the main circuit's functions and components.
POWER CIRCUIT OPERATION
Explanation of the unit's power supply and conversion circuits.
TROUBLESHOOTING
Q&A TROUBLESHOOTING
Common issues and their solutions presented in a question/answer format.
ELECTRICAL SYSTEM DIAGNOSTICS
Flowcharts for troubleshooting electrical component failures.
SELF-CHECK DIAGNOSTIC PROCEDURE
Steps to perform self-diagnosis for unit fault detection.
REFRIGERATING CYCLE DIAGNOSIS
Troubleshooting steps related to gas leaks and compressor issues.
PARTS LISTS
INDOOR UNIT PARTS LIST
List of part numbers and names for the indoor unit assembly.
OUTDOOR UNIT PARTS LIST
List of part numbers and names for the outdoor unit assembly.
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