Haier DW-25L300 Service Manual

Haier DW-25L300 Service Manual

Deep freezer-upright

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Service Manual
FILE No: HMRSM-02-002
Deep Freezer-upright
DW-25L92•DW-40L92•DW-40L188•DW-25L300•DW-40L262
DW-40L92
DW-40L188
DW-40L262
Haier Medical & Laboratory Products Co., Ltd.

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Table of Contents
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Summarization of Contents

Model Designation System
Decoding Model Names
Explains the meaning of each character in the model naming convention.
Safety Precautions
General Safety Guidelines
Covers electrical safety, handling hazardous materials, and preventing accidents.
Product Dimensions
Dimensions for DW-25L92 / DW-40L92
Provides dimensional drawings for specific upright deep freezer models.
Dimensions for DW-40L188
Provides dimensional drawings for the DW-40L188 upright deep freezer.
Dimensions for DW-25L300 / DW-40L262
Provides dimensional drawings for DW-25L300 and DW-40L262 models.
Product Specifications
Specifications for DW-25L92 and DW-40L92
Details technical specifications for DW-25L92 and DW-40L92 deep freezer models.
Specifications for DW-25L300 and DW-40L262
Details technical specifications for DW-25L300 and DW-40L262 deep freezer models.
Components and Function Modules
Temperature Control System
Explains microcomputer control, temperature display, and alarming functions.
Safety System Features
Covers error alarming, alarming methods, and start-up delay protection.
Refrigerating System Details
Highlights compressor type, refrigerant, insulation, and evaporator design.
Humanity Design Features
Details user-friendly features like drawer design, digital display, and door handle.
Product Graphical Representation
Component Identification and Remarks
Identifies key product components and provides specific installation remarks.
Disassembly Procedures
Handle Installation
Step-by-step guide for installing the door handle.
Control Board Disassembly
Instructions on how to remove the control board, including wire connections.
Installation Procedures
Control Board Installation Steps
Details the process for installing the control board, reversing disassembly steps.
Screen Control System
Computer Board Overview and Parameters
Visual overview of the computer board and its basic operational parameters.
Temperature Display and Control
Explains temperature display, range, quick-freeze function, and limitations.
Alarm and Error Handling
Details overheat alarms, freezing sensor errors, and their respective handling.
Breakdown Memory Function
Describes how the system remembers its state after a power interruption.
Temperature Adjustment and Alignment
Adjusting Set Temperature
Step-by-step guide for increasing or decreasing the set temperature.
Aligning Temperature Display
Procedure to align displayed temperature with the actual temperature.
Setting High and Low Temperature Limits
Details how to set the highest (HS) and lowest (LS) temperature limits.
Temperature Range Restrictions
Explains the constraints when setting HS and LS values and their impact.
Control System Principles
Compressor On/Off Principle
Explains how the system controls the compressor based on temperature readings.
Fan On/Off Principle
Describes the synchronous operation of the fan with the compressor.
System Schematic Diagram
Refrigeration Cycle Overview
Diagram illustrating the flow of refrigerant through the system components.
System Circuit Diagram
Electrical Connections and Components
Diagram showing the electrical connections between the computer board, sensors, and compressor.
Troubleshooting Common Errors
Compressor and Fan Troubleshooting
Analysis and maintenance for compressor startup and fan rotation issues.
High Temperature and Noise Issues
Addresses causes of high cabinet temperature and excessive noise.
Screen Display and Probe Issues
Troubleshooting for screen display errors (e.g., F1) and temperature probe problems.
Frequently Asked Questions (FAQ)
Inner Temperature Issues
Answers regarding inner temperature being too high or too low.
External Heat and Temperature Differences
Addresses questions about the refrigerator sides being hot and temperature display discrepancies.
Alarms and Frosting
Answers about short-time alarms, serious frosting, and sensor errors.
Temperature Setting Range
Clarifies the adjustable temperature range for the machine.
Cooling Unit Parts List
Compressor and Power Specifications
Lists compressor models, power ratings, and start capacitance for various models.
Refrigerant and Fan Motor Details
Provides information on refrigerants used and specifications for the fan motor.
Display Panel Information
Details the part number and manufacturer for the display panel.
Product Nameplate Information
Nameplate for DW-25L92
Details the specifications and identification information on the DW-25L92 nameplate.
Nameplate for DW-40L92
Details the specifications and identification information on the DW-40L92 nameplate.
Nameplate for DW-40L262
Details the specifications and identification information on the DW-40L262 nameplate.
Nameplate for DW-25L300
Details the specifications and identification information on the DW-25L300 nameplate.
Refrigerant Perfusion Details
Refrigerant Type and Quantity by Model
Table showing refrigerant type and weight for different freezer models.
Troubleshooting Guide
Compressor and Fan Troubleshooting
Analysis and maintenance for compressor startup and fan rotation issues.
High Temperature and Noise Issues
Addresses causes of high cabinet temperature and excessive noise.
Screen Display and Probe Issues
Troubleshooting for screen display errors (e.g., F1) and temperature probe problems.
Diagnosing Poor Cooling
High Temperature Alarm Diagnosis
Flowchart for diagnosing issues when a high temperature alarm is active.
Compressor and Fan Checks
Steps to check compressor and fan operation for cooling problems.
Refrigerant Leak Check
Final check for refrigerant leaks as a cause of poor cooling.
Spare Parts Identification
Exploded View of DW-25/40L262/300
Visual guide showing the assembly of DW-25/40L262/300 models.
DW-25/40L262/300 Spare Part List
Detailed list of spare parts with codes, names, and quantities.
Spare Parts List (Continued)
Compressor and Wire Spare Parts
Lists various compressor types, wires, and connection components.
Cabinet and Door Components
Details parts related to the cabinet, hinges, doors, and seals.
Spare Parts for DW-25/40L92
Exploded View of DW-25/40L92
Visual guide showing the assembly of DW-25/40L92 models.
DW-25L92 Spare Part List
Detailed list of spare parts for the DW-25L92 model.
Spare Parts for DW-40L188
DW-40L188 Spare Part List
Detailed list of spare parts for the DW-40L188 model.

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