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Hitachi RAM-50CNHZ2 - User Manual

Hitachi RAM-50CNHZ2
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NO. 0148E
SERVICE MANUAL
PM
TECHNICAL INFORMATION
FOR SERVICE PERSONNEL ONLY
SPECIFICATIONS
CONTENTS
SPECIFICATIONS ------------------------------------------------------------------- 7
HOW TO USE ---------------------------------------------------------------------- 10
CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 35
MAIN PARTS COMPONENT -------------------------------------------------- 37
WIRING DIAGRAM ---------------------------------------------------------------- 39
CIRCUIT DIAGRAM--------------------------------------------------------------- 41
PRINTED WIRING BOARD LOCATION DIAGRAM --------------------- 43
BLOCK DIAGRAM ----------------------------------------------------------------- 49
BASIC MODE ----------------------------------------------------------------------- 51
REFRIGERATING CYCLE DIAGRAM --------------------------------------- 64
DESCRIPTION OF MAIN CIRCUIT OPERATION (INDOOR) -------- 65
DESCRIPTION OF MAIN CIRCUIT OPERATION (OUTDOOR) ---- 71
TROUBLE SHOOTING----------------------------------------------------------- 95
PARTS LIST AND DIAGRAM------------------------------------------------- 110
RAS-20CNHZ2
RAS-30CNHZ2
REFER TO THE FOUNDATION MANUAL
INDOOR UNIT
RAS-20CNHZ2 RAS-30CNHZ2
OUTDOOR UNIT
RAM-50CNHZ2
DC INVERTER DUAL SYSTEM MULTI (WALL TYPE)
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
ROOM AIR CONDITIONER
INDOOR UNIT + OUTDOOR UNIT
MAY 2002
H.A.P.M.
TYPE
MODEL
1ø, 220V – 230V, 50HzPOWER SOURCE
TOTAL INPUT
TOTAL AMPERES
COOLING CAPACITY
HEATING CAPACITY
DIMENSIONS
NET WEIGHT
(W)
(A)
(kW)
(B.T.U.)
W
H
D
(kg)
(mm)
745
248
175
5.5
850
650
298
43
RAS-20CNHZ2
RAM-50CNHZ2
RAS-30CNHZ2
RAM-50CNHZ2
798
265
168
6.5
REFER TO THE SPECIFICATIONS PAGE 8.
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Summary

Safety During Repair Work

Working Standards for Preventing Breakage of Semiconductors

Safety Precautions

Precautions During Installation

Guidelines for safe installation of the unit, including grounding and circuit breaker.

Precautions During Shifting or Maintenance

Safety measures for moving or maintaining the unit, emphasizing professional assistance.

Precautions During Operation

Safety rules to follow during the normal operation of the air conditioner.

Specifications

Specifications for Indoor Units Combinations

Installation

Height Difference

Specifies the maximum allowed height difference between indoor units.

Piping Length

Details the maximum allowable piping lengths for the air conditioner system.

Multi-Air Conditioner

Combination of Operations

Describes permissible combinations for operating multiple indoor units.

Adjusting the Number of Indoor Units

Guidance on adjusting the number of active indoor units for optimal performance.

Stopped Indoor Units

Information on phenomena observed in stopped indoor units during operation.

Names and Functions of Each Part

Model Name and Dimensions

Lists model names and their corresponding physical dimensions.

Operation Indicator

Temporary Switch

Details the function and use of the temporary operation switch.

Auto Restart Switch

Explains the auto restart function after power failure or interruption.

Indoor Unit Indicators

Operation Lamp

Describes the function and behavior of the operation indicator lamp.

Timer Lamp

Explains the function of the timer indicator lamp.

Signal Receiver

Details the signal receiver for remote control communication.

Filter Lamp

Indicates when the air filter needs cleaning or replacement.

Names and Functions of Remote Control Unit

Remote Controller

Overview of the remote controller's buttons and display.

Precautions for Use

Important guidelines for the proper and safe use of the remote controller.

Automatic Operation

Condition of Automatic Operation

Details the conditions under which automatic operation mode functions.

Heating Operation

Dehumidifying Operation

Dehumidifying Function

Explains the specific mechanism and behavior of the dehumidifying function.

Cooling Operation

Fan Operation

Fan Speed (Auto)

Describes the automatic fan speed control during cooling or heating.

How to Set the Timer

Off-Timer

Instructions for setting the timer to turn the unit off at a specific time.

On-Timer

Instructions for setting the timer to turn the unit on at a specific time.

On;Off-Timer

Instructions for setting timers for both turning on and off the unit.

How to Cancel Reservation

Procedure to cancel any pre-set timer reservations.

How to Set the Sleep Timer

How to Cancel Reservation

Procedure to cancel the sleep timer reservation.

Explanation of the Sleep Timer

Adjusting the Air Deflector

The Ideal Ways of Operation

Suitable Room Temperature

Recommendations for setting the ideal room temperature for comfort and efficiency.

Install Curtain or Blinds

Advice on using curtains or blinds to manage room temperature.

Ventilation

Importance of proper ventilation and fresh air circulation.

Effective Usage Of Timer

Tips for maximizing comfort by effectively using the timer functions.

Do Not Forget To Clean The Air Filter

Emphasizes regular cleaning of the air filter for optimal performance.

Please Adjust Suitable Temperature For Baby And Children

Guidance on temperature settings for vulnerable individuals.

For User’s Information

The Air Conditioner And The Heat Source In The Room

Discusses the impact of room heat sources on air conditioner performance.

After Power Failure

Explains the unit's behavior and required actions after a power failure.

Not Operating For A Long Time

Instructions for proper shutdown when the unit is not in use for extended periods.

When Lightning Occurs

Safety precautions to take during thunderstorms.

Attaching the Air Cleansing and Deodorizing Filters

Maintenance

1. Air Filter

Procedure for cleaning and maintaining the air filter.

2. Washable Front Panel

3. Maintenance at Beginning of Long Off Period

Regular Inspection

After Sale Service and Warranty

When Asking for Service, Check the Following Points

Checklist of common issues to verify before requesting service.

Construction and Dimensional Diagram

Main Parts Component

Thermostat

Specifications and details related to the thermostat component.

Fan Motor

Specifications and details for the fan motor component.

Compressor Motor

Wiring Diagram

Indoor Unit

Wiring diagram specific to the indoor unit.

Wiring Diagram

Outdoor Unit

Wiring diagram specific to the outdoor unit.

Circuit Diagram

Remote Control

Circuit diagram illustrating the remote control system.

Printed Wiring Board Location Diagram

Block Diagram

Indoor

Block diagram illustrating the indoor unit's functional components.

Outdoor

Block diagram illustrating the outdoor unit's functional components.

Basic Mode

New Cool Rhythm

Cooling Sleep Operation

Dehumidifying

Cooling Defrost

Basic Heating Operation

Heating Sleep Operation

Defrost

Defrost start condition

Conditions required for the defrost cycle to initiate.

Defrost release condition

Conditions that lead to the termination of the defrost cycle.

Outputs during defrost

Details the outputs and actions taken during the defrost cycle.

Time chart when executing defrost (both unit 1 and unit 2 operated)

Time chart when executing defrost (Only unit 1 operated, unit 2 stopped)

Auto-Fresh Defrost

Start conditions for auto-fresh

Conditions required for the auto-fresh defrost function to activate.

Release condition of auto-fresh

Conditions that lead to the release or termination of auto-fresh defrost.

Outputs during auto-fresh

Details the outputs and actions performed during auto-fresh defrost.

Forced Cooling

Refrigerating Cycle Diagram

Cooling, Dehumidifying, Defrosting

Diagram illustrating the refrigerant cycle for cooling, dehumidifying, and defrost.

Heating

Diagram illustrating the refrigerant cycle during heating operation.

Description of Main Circuit Operation (Indoor)

1. Reset Circuit

Explanation of the reset circuit's function and operation.

2. Receive Circuit

3. Buzzer Circuit

4. Auto Sweep Motor Circuit

5. Room Temperature Thermistor Circuit

6. Heat Exchanger Temperature Thermistor Circuit

7. Auto Restart; Temporary Switch

8. DC Fan Motor Drive Circuit

Description of Main Circuit Operation (Outdoor)

1. Power Circuit

Explanation of the outdoor unit's power circuit and its components.

2. Indoor;Outdoor Interface Circuit

3. System Power Module Circuit

4. Power Circuit for P.W.B.

5. Reversing Valve Control Circuit

6. Rotor Magnetic Pole Position Detection Circuit

7. Peripheral Circuits of Microcomputer

7-1. Peak Current Cut Off Circuit

Details the peak current cut-off circuit and its operational waveforms.

8. Overload Control Circuit (OVL Control)

9. Reset Circuit

10. Temperature Detection Circuit

11. Drive Circuit

12. Electric Expansion Valve

Outdoor DC Fan Motor Control Circuit

Trouble Shooting

Checking the Outdoor Unit Electrical Parts

Troubleshooting guide for outdoor unit electrical components.

Trouble Shooting

Precautions for Checking

General precautions and safety measures before checking components.

Discharge Procedure and How to Cut Off Power to Power Circuit

Lighting Mode Self-Diagnosis Lamp

1 Location of Self-Diagnosis Lamp

Identifies the physical location of the self-diagnosis indicator lamp.

2 Lighting Mode Self-Diagnosis Lamp

Troubleshooting of the System Power Module

How to Check Power Module

Checking the Refrigerating Cycle

1. Troubleshooting Procedure (No Operation, No Heating, No Cooling)

Step-by-step troubleshooting for basic operational failures.

Parts List and Diagram

Summary

Safety During Repair Work

Working Standards for Preventing Breakage of Semiconductors

Safety Precautions

Precautions During Installation

Guidelines for safe installation of the unit, including grounding and circuit breaker.

Precautions During Shifting or Maintenance

Safety measures for moving or maintaining the unit, emphasizing professional assistance.

Precautions During Operation

Safety rules to follow during the normal operation of the air conditioner.

Specifications

Specifications for Indoor Units Combinations

Installation

Height Difference

Specifies the maximum allowed height difference between indoor units.

Piping Length

Details the maximum allowable piping lengths for the air conditioner system.

Multi-Air Conditioner

Combination of Operations

Describes permissible combinations for operating multiple indoor units.

Adjusting the Number of Indoor Units

Guidance on adjusting the number of active indoor units for optimal performance.

Stopped Indoor Units

Information on phenomena observed in stopped indoor units during operation.

Names and Functions of Each Part

Model Name and Dimensions

Lists model names and their corresponding physical dimensions.

Operation Indicator

Temporary Switch

Details the function and use of the temporary operation switch.

Auto Restart Switch

Explains the auto restart function after power failure or interruption.

Indoor Unit Indicators

Operation Lamp

Describes the function and behavior of the operation indicator lamp.

Timer Lamp

Explains the function of the timer indicator lamp.

Signal Receiver

Details the signal receiver for remote control communication.

Filter Lamp

Indicates when the air filter needs cleaning or replacement.

Names and Functions of Remote Control Unit

Remote Controller

Overview of the remote controller's buttons and display.

Precautions for Use

Important guidelines for the proper and safe use of the remote controller.

Automatic Operation

Condition of Automatic Operation

Details the conditions under which automatic operation mode functions.

Heating Operation

Dehumidifying Operation

Dehumidifying Function

Explains the specific mechanism and behavior of the dehumidifying function.

Cooling Operation

Fan Operation

Fan Speed (Auto)

Describes the automatic fan speed control during cooling or heating.

How to Set the Timer

Off-Timer

Instructions for setting the timer to turn the unit off at a specific time.

On-Timer

Instructions for setting the timer to turn the unit on at a specific time.

On;Off-Timer

Instructions for setting timers for both turning on and off the unit.

How to Cancel Reservation

Procedure to cancel any pre-set timer reservations.

How to Set the Sleep Timer

How to Cancel Reservation

Procedure to cancel the sleep timer reservation.

Explanation of the Sleep Timer

Adjusting the Air Deflector

The Ideal Ways of Operation

Suitable Room Temperature

Recommendations for setting the ideal room temperature for comfort and efficiency.

Install Curtain or Blinds

Advice on using curtains or blinds to manage room temperature.

Ventilation

Importance of proper ventilation and fresh air circulation.

Effective Usage Of Timer

Tips for maximizing comfort by effectively using the timer functions.

Do Not Forget To Clean The Air Filter

Emphasizes regular cleaning of the air filter for optimal performance.

Please Adjust Suitable Temperature For Baby And Children

Guidance on temperature settings for vulnerable individuals.

For User’s Information

The Air Conditioner And The Heat Source In The Room

Discusses the impact of room heat sources on air conditioner performance.

After Power Failure

Explains the unit's behavior and required actions after a power failure.

Not Operating For A Long Time

Instructions for proper shutdown when the unit is not in use for extended periods.

When Lightning Occurs

Safety precautions to take during thunderstorms.

Attaching the Air Cleansing and Deodorizing Filters

Maintenance

1. Air Filter

Procedure for cleaning and maintaining the air filter.

2. Washable Front Panel

3. Maintenance at Beginning of Long Off Period

Regular Inspection

After Sale Service and Warranty

When Asking for Service, Check the Following Points

Checklist of common issues to verify before requesting service.

Construction and Dimensional Diagram

Main Parts Component

Thermostat

Specifications and details related to the thermostat component.

Fan Motor

Specifications and details for the fan motor component.

Compressor Motor

Wiring Diagram

Indoor Unit

Wiring diagram specific to the indoor unit.

Wiring Diagram

Outdoor Unit

Wiring diagram specific to the outdoor unit.

Circuit Diagram

Remote Control

Circuit diagram illustrating the remote control system.

Printed Wiring Board Location Diagram

Block Diagram

Indoor

Block diagram illustrating the indoor unit's functional components.

Outdoor

Block diagram illustrating the outdoor unit's functional components.

Basic Mode

New Cool Rhythm

Cooling Sleep Operation

Dehumidifying

Cooling Defrost

Basic Heating Operation

Heating Sleep Operation

Defrost

Defrost start condition

Conditions required for the defrost cycle to initiate.

Defrost release condition

Conditions that lead to the termination of the defrost cycle.

Outputs during defrost

Details the outputs and actions taken during the defrost cycle.

Time chart when executing defrost (both unit 1 and unit 2 operated)

Time chart when executing defrost (Only unit 1 operated, unit 2 stopped)

Auto-Fresh Defrost

Start conditions for auto-fresh

Conditions required for the auto-fresh defrost function to activate.

Release condition of auto-fresh

Conditions that lead to the release or termination of auto-fresh defrost.

Outputs during auto-fresh

Details the outputs and actions performed during auto-fresh defrost.

Forced Cooling

Refrigerating Cycle Diagram

Cooling, Dehumidifying, Defrosting

Diagram illustrating the refrigerant cycle for cooling, dehumidifying, and defrost.

Heating

Diagram illustrating the refrigerant cycle during heating operation.

Description of Main Circuit Operation (Indoor)

1. Reset Circuit

Explanation of the reset circuit's function and operation.

2. Receive Circuit

3. Buzzer Circuit

4. Auto Sweep Motor Circuit

5. Room Temperature Thermistor Circuit

6. Heat Exchanger Temperature Thermistor Circuit

7. Auto Restart; Temporary Switch

8. DC Fan Motor Drive Circuit

Description of Main Circuit Operation (Outdoor)

1. Power Circuit

Explanation of the outdoor unit's power circuit and its components.

2. Indoor;Outdoor Interface Circuit

3. System Power Module Circuit

4. Power Circuit for P.W.B.

5. Reversing Valve Control Circuit

6. Rotor Magnetic Pole Position Detection Circuit

7. Peripheral Circuits of Microcomputer

7-1. Peak Current Cut Off Circuit

Details the peak current cut-off circuit and its operational waveforms.

8. Overload Control Circuit (OVL Control)

9. Reset Circuit

10. Temperature Detection Circuit

11. Drive Circuit

12. Electric Expansion Valve

Outdoor DC Fan Motor Control Circuit

Trouble Shooting

Checking the Outdoor Unit Electrical Parts

Troubleshooting guide for outdoor unit electrical components.

Trouble Shooting

Precautions for Checking

General precautions and safety measures before checking components.

Discharge Procedure and How to Cut Off Power to Power Circuit

Lighting Mode Self-Diagnosis Lamp

1 Location of Self-Diagnosis Lamp

Identifies the physical location of the self-diagnosis indicator lamp.

2 Lighting Mode Self-Diagnosis Lamp

Troubleshooting of the System Power Module

How to Check Power Module

Checking the Refrigerating Cycle

1. Troubleshooting Procedure (No Operation, No Heating, No Cooling)

Step-by-step troubleshooting for basic operational failures.

Parts List and Diagram

Hitachi RAM-50CNHZ2 Specifications

General IconGeneral
BrandHitachi
ModelRAM-50CNHZ2
CategoryAir Conditioner
LanguageEnglish

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