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Mitsubishi PUHY-EP250 User Manual

Mitsubishi PUHY-EP250
298 pages
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Table of Contents

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Mitsubishi PUHY-EP250 Specifications

General IconGeneral
Cooling Capacity28.0 kW
Heating Capacity31.5 kW
RefrigerantR410A
SeriesCity Multi
TypeHeat Pump
Power Supply380-415V, 50Hz, 3-Phase
Operating Temperature Range (Cooling)-5°C to 46°C DB
Operating Temperature Range (Heating)-20°C to 15.5°C WB

Summary

Safety Precautions

General Precautions

Essential safety measures for handling and operating the air conditioner.

Transportation and Installation

Precautions for safe transportation and installation of the unit.

Installation

Guidelines for the correct and safe installation of the unit.

Piping Work

Safety measures for refrigerant piping procedures.

Wiring Work

Safety guidelines for electrical wiring and connections.

Relocation and Repairs

Safety instructions for unit relocation and repair procedures.

Additional Precautions

Further precautions for installation, inspection, and operation.

Chapter 1 Piping Work

1-1 Preparation for Piping Work

Steps to take before starting piping installation.

1-3 Working with Refrigerant Piping

Procedures for brazing, leak testing, and charging refrigerant.

Chapter 2 Restrictions

2-1 System Configurations

Compatible combinations of indoor and outdoor units.

2-2 Types and Maximum Allowable Length of Cables

Specifications for control wiring types and maximum lengths.

2-3 Switch Settings

Configuring system settings using dipswitches.

2-4 M-NET Address Settings

Procedures for setting M-NET addresses for system components.

2-5 Demand Control Overview

How demand control functions operate and are configured.

2-6 System Connection Example

Illustrative examples of system connection configurations.

2-7 Example System with an MA Remote Controller

Wiring and configuration examples for systems using MA remote controllers.

2-8 Example System with an ME Remote Controller

Wiring and configuration examples for systems using ME remote controllers.

2-9 Example System with an MA and an ME Remote Controller

Examples for systems using both MA and ME remote controllers.

2-10 Restrictions on Refrigerant Pipes

Guidelines for refrigerant pipe length and diameter restrictions.

Chapter 3 Major Components, Their Functions and Refrigerant Circuits

3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit

Visual identification of outdoor unit parts and refrigerant circuit.

3-2 Outdoor Unit Refrigerant Circuit Diagrams

Schematic diagrams of outdoor unit refrigerant circuits.

3-3 Functions of the Major Components of Outdoor Unit

Detailed explanation of the functions of major outdoor unit components.

3-4 Functions of the Major Components of Indoor Unit

Detailed explanation of the functions of major indoor unit components.

Chapter 4 Electrical Components and Wiring Diagrams

4-1 Outdoor Unit Circuit Board Arrangement

Layout and arrangement of circuit boards within the outdoor unit.

4-2 Outdoor Unit Circuit Board Components

Identification of components on the outdoor unit circuit boards.

4-3 Outdoor Unit Electrical Wiring Diagrams

Electrical wiring diagrams for outdoor units.

4-4 Transmission Booster Electrical Wiring Diagrams

Wiring diagrams specific to the transmission booster.

Chapter 5 Control

5-1 Dipswitch Functions and Factory Settings

Configuration settings via dipswitches and default factory settings.

5-2 Outdoor Unit Control

Detailed control mechanisms for outdoor units, including protection and operation modes.

5-3 Operation Flowcharts

Visual flowcharts illustrating operational sequences and logic.

Chapter 6 Test Run

6-1 Read before Test Run

Essential checks and precautions before performing a test run.

6-2 MA and ME Remote Controller Functions and Specifications

Comparison of features and specifications for MA and ME remote controllers.

6-3 Making the Group and Interlock Settings from an ME Remote Controller

Steps to configure group and interlock settings using ME remote controller.

6-4 Selecting Remote Controller Functions from an ME Remote Controller

Guide to selecting various functions available on the ME remote controller.

6-5 Making Interlock Settings from an MA Remote Controller

Procedures for setting up interlocks with LOSSNAY units using MA remote controller.

6-6 Changing the Room Temperature Detection Position

How to select the sensor used for room temperature detection.

6-7 Test Run Method

Detailed methods for performing test runs with remote controllers.

6-8 Operation Characteristics and Refrigerant Charge

Understanding system performance related to refrigerant charge.

6-9 Evaluating and Adjusting Refrigerant Charge

Procedures for assessing and adjusting refrigerant levels.

6-10 The Following Symptoms Are Normal

Identification of normal operating symptoms that may appear unusual.

6-11 Standard Operation Data (Reference Data)

Reference data for system operating parameters.

Chapter 7 Troubleshooting Using Error Codes

7-1 Error Code and Preliminary Error Code Lists

Lists of all error codes and their preliminary identification.

7-2 Error Code Definitions and Solutions: Codes [0 - 999]

Explanations and solutions for error codes 0-999.

7-3 Error Code Definitions and Solutions: Codes [1000 - 1999]

Explanations and solutions for error codes 1000-1999.

7-4 Error Code Definitions and Solutions: Codes [2000 - 2999]

Explanations and solutions for error codes 2000-2999.

7-5 Error Code Definitions and Solutions: Codes [3000 - 3999]

Explanations and solutions for error codes 3000-3999.

7-6 Error Code Definitions and Solutions: Codes [4000 - 4999]

Explanations and solutions for error codes 4000-4999.

7-7 Error Code Definitions and Solutions: Codes [5000 - 5999]

Explanations and solutions for error codes 5000-5999.

7-8 Error Code Definitions and Solutions: Codes [6000 - 6999]

Explanations and solutions for error codes 6000-6999.

7-9 Error Code Definitions and Solutions: Codes [7000 - 7999]

Explanations and solutions for error codes 7000-7999.

Chapter 8 Troubleshooting Based on Observed Symptoms

8-1 MA Remote Controller Problems

Specific troubleshooting steps for MA remote controller issues.

8-2 ME remote Controller Problems

Specific troubleshooting steps for ME remote controller issues.

8-3 Refrigerant Control Problems

Diagnosing and resolving issues with refrigerant flow and control.

8-4 Checking Transmission Waveform and for Electrical Noise Interference

Analyzing transmission signals and identifying electrical noise.

8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems

Understanding pressure sensor circuits and troubleshooting related faults.

8-6 Troubleshooting Solenoid Valve Problems

Diagnosing and resolving issues with solenoid valves.

8-7 Troubleshooting Outdoor Unit Fan Problems

Troubleshooting issues related to the outdoor unit's fan motor and operation.

8-8 Troubleshooting LEV Problems

Diagnosing and resolving problems with Linear Expansion Valves (LEVs).

8-9 Troubleshooting Inverter Problems

Troubleshooting issues specific to the inverter circuit and components.

8-10 Control Circuit

Overview and troubleshooting of the unit's control circuit.

8-11 Measures for Refrigerant Leakage

Procedures for detecting and addressing refrigerant leaks.

8-12 Compressor Replacement Instructions

Step-by-step guide for replacing the compressor unit.

8-13 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit

Using LED indicators on the outdoor unit to diagnose problems.

Chapter 9 LED Status Indicators on the Outdoor Unit Circuit Board

9-1 LED Status Indicators

General overview of LED status indicators and how to read them.

9-2 LED Status Indicators Table

A table mapping LED patterns to specific statuses and errors.

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