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Mitsubishi Heavy Industries SRK20HC-S User Manual

Mitsubishi Heavy Industries SRK20HC-S
34 pages
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3
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WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
(Split system, air to air heat pump type)
SRK20HC-S, SRK28HC-S, SRK40HC-S
TECHNICAL MANUAL
Collection data
Manual No. ’03
.
SRK-T
.
031
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Mitsubishi Heavy Industries SRK20HC-S Specifications

General IconGeneral
TypeSplit System
Cooling Capacity2.0 kW
Heating Capacity2.5 kW
Power Supply220-240V, 50Hz
RefrigerantR410A
Noise Level (Outdoor)48 dB

Summary

General Information and Model Identification

Specific Features of Air Conditioners

Details key operational aspects like automatic flap control, auto mode, and self-diagnosis function.

How to Read the Model Name

Explains the nomenclature used for model identification, breaking down the product code.

Selection Data and Specifications

Technical Specifications of Air Conditioners

Lists detailed technical specifications for different models, including capacity, power, dimensions, and refrigerant.

Usage Limitations and Dimensions

Range of Usage and Limitations

Defines the operational limits and conditions for safe and effective use of the air conditioner.

Exterior Dimensions of Units

Provides detailed physical dimensions of both indoor and outdoor units for installation planning.

Piping System Diagram

Refrigerant Piping System Overview

Illustrates the refrigerant circuit and components for cooling and heating cycles.

Capacity Selection Chart

Capacity Correction Factors

Guides capacity correction based on temperature and piping length for proper unit selection.

Electrical Data and Wiring

Electrical Wiring Diagrams

Details the electrical connections and wiring diagrams for the indoor and outdoor units.

Operation Control by Microcomputer

Remote Control Functions

Explains the functions of buttons on the remote control and the corresponding indicator lights.

Operation Controls and Features

Backup Switch Operation

Describes the function and operation of the unit's backup switch for manual control.

Power-Cut Compensation Function

Details the function that resumes operation after a power interruption.

Flap and Timer Controls

Flap Control Modes

Explains how the flap position is controlled, including air scroll, memory, and swing functions.

Comfort Timer Setting

Describes the comfort timer and how it adjusts the next operation start time based on temperature.

Outline of Heating Operation

Major Functional Components in Heating

Details the behavior of key components like fans, flaps, and valves during heating.

Fan Speed Switching in Heating

Explains how fan speeds are adjusted for different airflow controls during heating.

Thermostat Operation in Heating

Describes how the compressor and outdoor fan operate based on temperature settings during heating.

Hot Keep Function

Explains the function that maintains a minimum temperature to prevent frost.

Heating Operation Modes

Hot Spurt Function

Details the 'Hot Spurt' function, which temporarily raises the set temperature for faster heating.

High Power Operation (HI POWER)

Explains the High Power mode operation for 15 minutes for rapid heating.

Defrost Operation Conditions

Outlines the conditions and process for automatic defrost operation to remove ice build-up.

Defrost and Economy Operations

Defrost Operation Component Behavior

Illustrates component behavior during defrosting, including compressor and fan actions.

Forced Defrost Procedure

Describes the procedure for manually initiating a defrost cycle for testing or specific conditions.

ECONO Operation Mode

Explains the ECONO mode, which adjusts set temperature and fan speed for energy saving.

Outline of Cooling Operation

Major Functional Components in Cooling

Details the behavior of key components during cooling operation.

Fan Speed Switching in Cooling

Explains how fan speeds are adjusted for different airflow controls during cooling.

Thermostat Operation in Cooling

Describes how the compressor and outdoor fan operate based on temperature settings during cooling.

High Power Operation (HI POWER) in Cooling

Explains the High Power mode operation for 15 minutes for rapid cooling.

ECONO Operation in Cooling

Explains the ECONO mode, which adjusts set temperature and fan speed for energy saving in cooling.

Outline of Dehumidifying Operation

Start Up Operation for Dehumidifying

Details the initial operational steps for dehumidifying mode, including fan and compressor actions.

DRY Operation Cycles

Explains the cyclical operation of the unit in DRY mode based on temperature differences.

ECONO Operation in Dehumidifying

Explains the ECONO mode for dehumidifying, adjusting set temperature and fan speed.

Automatic and Protective Controls

Automatic Operation Mode Determination

Explains how the unit automatically selects the operation mode (Heating, Dry, Cooling) based on room temperature.

Frost Prevention for Indoor Heat Exchanger

Describes the conditions and actions taken to prevent frost on the indoor heat exchanger.

Indoor Fan Motor Protection

Explains the protection mechanism for the indoor fan motor, including error indications.

Dew Condensation Prevention Control

Details the control to prevent dew condensation in the indoor unit during cooling.

Three-Minute Forced Operation

Explains the mandatory 3-minute operation period before thermal operation becomes effective.

Protective Control Functions

High-Pressure Control

Explains how high pressure is managed by controlling the outdoor fan and compressor.

Current Cut Protection

Describes the protection mechanism that cuts off current to the compressor during overcurrent conditions.

Compressor Overheat Protection

Details the protection that stops the compressor if discharge pipe temperature exceeds a limit.

Serial Signal Transmission Error Protection

Explains the protection against errors in communication between indoor and outdoor units.

Thermistor Disconnection Errors

Describes error conditions and indications related to thermistor disconnections or failures.

Application Data: Safety Precautions

General Safety Precautions

Provides critical safety warnings and precautions for installation and operation.

Warning for Installation Hazards

Lists serious safety hazards and necessary precautions during installation and handling.

Caution for Installation Risks

Highlights important safety considerations and potential risks requiring careful attention.

Installation Location and Limitations

Selection of Location for Installation

Provides guidelines for selecting optimal locations for indoor and outdoor unit installation.

Piping Length and Height Difference Limitations

Specifies the maximum allowed piping length and vertical height difference between units.

Indoor Unit Installation

Installation of Mounting Board

Details the process and requirements for mounting the indoor unit's installation board.

Drilling and Fixture Sleeve Installation

Explains how to drill holes and install fixture sleeves for piping passage.

Indoor Unit Preparation

Preparation of Indoor Unit Components

Covers preparation steps for the indoor unit, including connecting wires and forming pipes.

Outdoor Unit and Refrigerant Piping Installation

Outdoor Unit Installation Guidelines

Provides instructions for properly installing the outdoor unit on a stable base.

Indoor and Outdoor Connecting Wiring

Details how to connect the wiring between the indoor and outdoor units correctly.

Refrigerant Piping Preparation

Explains how to prepare refrigerant piping, including keeping openings clean and removing nuts.

Refrigerant Piping Connection and Air Purge

Connection of Refrigerant Piping

Details the procedure for connecting refrigerant piping, including torque specifications.

Air Purge Procedure

Explains the process of removing air and moisture from the refrigerant system using a vacuum pump.

Insulation of Connecting Portions

Covers the insulation of refrigerant pipe connections to prevent condensation.

Test Run and Remote Controller Precautions

Performing the Test Run

Outlines the steps for conducting a trial run to ensure proper operation and check for leaks.

Standard Operation Data

Lists standard operating data such as pressure, temperature difference, and running current for different models.

Wireless Remote Controller Usage Distances

Specifies the effective operating distances and angles for the wireless remote controller.

Maintenance Data: Troubleshooting

Troubleshooting Prior to PCB Exchange

Provides a flowchart and initial checks for troubleshooting common operational issues before PCB exchange.

Troubleshooting: Self Diagnosis and Inspections

Indoor Unit Self Diagnosis Display

Explains the self-diagnosis codes indicated by the RUN and TIMER lamps and outdoor unit LEDs.

Inspection Procedures for Troubles

Details inspection steps for thermistor errors, including resistance checks and PCB replacement.

Troubleshooting Specific Faults

Current Cut Troubleshooting

Outlines troubleshooting steps for current cut issues, including service valve and short circuit checks.

Outdoor Unit Abnormalities

Provides troubleshooting for outdoor unit abnormalities like overload operation or wiring issues.

Compressor Overheat Troubleshooting

Details checks for compressor overheat, such as thermistor resistance and refrigerant levels.

Indoor Fan Motor Error Troubleshooting

Explains troubleshooting for indoor fan motor errors, checking connections, voltage, and motor itself.

Troubleshooting Signal and Thermistor Errors

Serial Signal Transmission Error

Guides troubleshooting for serial signal transmission errors between indoor and outdoor units.

Thermistor Shortcircuit and Wire Breakage Phenomena

Describes phenomena observed after short circuits or wire breakages on indoor and outdoor unit thermistors.

Troubleshooting Electrical and Remote Controls

Indoor Electrical Equipment Inspection

Details inspection procedures for indoor electrical components like fuses and terminal blocks.

Remote Controller Function Check

Provides steps to check if the remote controller is functioning correctly.

Servicing Procedures

Evacuation Procedure

Explains the process of evacuating the refrigerant system to remove impurities.

Refrigerant Charging Procedure

Details the procedure for charging the correct amount of refrigerant into the system.

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