Hitachi RAM-55QH5 User Manual

RAM-55QH5
RAM-65QH5
NO. 0312E
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
OUTDOOR UNIT
DECEMBER 2005 Refrigeration & Air-Conditioning Division
SERVICE MANUAL
PM
REFER TO THE FOUNDATION MANUAL
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 5
INSTALLATION --------------------------------------------------------------------- 14
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 21
MAIN PARTS COMPONENT --------------------------------------------------- 23
CAPACITY DIAGRAM ------------------------------------------------------------ 25
WIRING DIAGRAM ---------------------------------------------------------------- 33
CIRCUIT DIAGRAM --------------------------------------------------------------- 37
BLOCK DIAGRAM ----------------------------------------------------------------- 43
BASIC MODE ----------------------------------------------------------------------- 45
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 71
DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 75
TROUBLE SHOOTING ---------------------------------------------------------- 106
DISASSEMBLY AND REASSEMBLY --------------------------------------- 113
PARTS LIST AND DIAGRAM ------------------------------------------------- 116
RAM-55QH5
RAM-65QH5
After installation
NOTE:
This manual describes only points that differ from RAF-25, 35,
50NH5, RAD-25, 35NH5, RAD-25, 35NH5 and RAM-80QH5 (TC
No. 0771EF), RAI-25, 35NH5 (PM No. 0271E), RAI-50NH5 and
RAC-50NH5 (PM No. 0274E), RAK-18, 25, 35NH5 (PM No.
0269E), RAK-50NH5 and RAC-50NH5 (PM No. 0302E) for items
not described in this manual.
850
650
298
50
(W)
(A)
COOLING CAPACITY
DC INVERTER DUAL SYSTEM MULTI
TYPE
MODEL
POWER SOURCE
TOTAL INPUT
TOTAL AMPERES
SPECIFICATIONS
OUTDOOR UNIT
RAM-55QH5
RAM-65QH5
HEATING CAPACITY
DIMENSIONS (mm)
NET WEIGHT
1ø, 220 - 240V, 50Hz
W
H
D
(kg)
(kW)
(B.T.U.)
REFER TO THE SPECIFICATIONS PAGE

Hitachi RAM-55QH5 Specifications

General

Brand	Hitachi
Model	RAM-55QH5
Category	Air Conditioner
Language	English

Summary

SAFETY DURING REPAIR WORK

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

Scope

Defines the scope of semiconductor handling standards.

Object parts

Lists critical semiconductor components covered.

Items to be observed in handling

Details essential handling practices for semiconductors.

SPECIFICATIONS

INSTALLATION

PIPE LENGTH

Specifies maximum allowable pipe lengths for installation.

HIGHT DIFFERENCE

Details acceptable height differences for installation.

Connection of the connecting cords and power cord

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MAIN PARTS COMPONENT

FAN MOTOR

Details specifications and connections for the fan motor.

COMPRESSOR

Provides specifications for the compressor unit.

CAPACITY DIAGRAM

SOUND PRESSURE LEVEL

WIRING DIAGRAM

CIRCUIT DIAGRAM

BLOCK DIAGRAM

BASIC MODE

DEFROST

FORCED COOLING

PROCESSING AT OVERHEAT THERMISTOR (OH) HIGH TEMPERATURE

REFRIGERATING CYCLE DIAGRAM

DESCRIPTION OF MAIN CIRCUIT OPERATION

Power Circuit

Details the AC to DC power conversion process.

System Power Module Circuit

Explains the function of the system power module.

Power Supply Circuit

Describes the operation of the power supply circuits.

Reversing valve control circuit

Explains how the reversing valve is controlled.

INSPECTING OUTDOOR ELECTRICAL PARTS

Inspection method 1

Step-by-step checks for electrical issues.

Inspection method 2

Diagnostic steps based on LED blinking patterns.

Inspection method 3

Thermistor failure diagnosis using LED indicators.

Inspection method 4

Communication error diagnosis for indoor units.

HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT

HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY

Guides independent operation of the outdoor unit.

PRECAUTIONS FOR CHECKING

Discharge Procedure

Safe steps to discharge power circuits.

TROUBLE SHOOTING

DISASSEMBLY AND REASSEMBLY

Electric parts

Steps for removing and handling electrical components.

Front cover

Procedure for removing the front cover.

Refrigerating Cycle Components

Steps for disassembling cycle parts.

ELECTRIC EXPANSION VALVE & PIPE THERMISTOR POSITION CHARTS

PARTS LIST AND DIAGRAM