Mitsubishi Heavy Industries SRK20MA-S User Manual

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Mitsubishi Heavy Industries Air Conditioners
Technical Manual
Manual Number: 2011 No. W2-01
Variable Frequency Wall Mounted Type
Room Air Conditioners
(Split system, heat pump type)
SRK20MA-S/SRC20MA-S
SRK25MA-S/SRC25MA-S
SRK35MA-S/SRC35MA-S
SRK50MA-S/SRC50MA-S
(R410A Refrigerant Used)
MITSUBISHI HEAVY INDUSTRIES, LTD.

Mitsubishi Heavy Industries SRK20MA-S Specifications

General

Cooling Capacity	2.0 kW
Heating Capacity	2.5 kW
Power Supply	220-240 V, 50 Hz
Refrigerant	R410A
Type	Split System
Energy Efficiency Ratio (EER)	3.20
Outdoor Unit Dimensions (W x H x D)	540 x 645 x 275 mm

Summary

Model Selection

Model Specifications (SRK20MA-S/SRC20MA-S)

Technical specifications for SRK20MA-S (Indoor) and SRC20MA-S (Outdoor) units.

Model Specifications (SRK25MA-S/SRC25MA-S)

Technical specifications for SRK25MA-S (Indoor) and SRC25MA-S (Outdoor) units.

Model Specifications (SRK35MA-S/SRC35MA-S)

Technical specifications for SRK35MA-S (Indoor) and SRC35MA-S (Outdoor) units.

Model Specifications (SRK50MA-S/SRC50MA-S)

Technical specifications for SRK50MA-S (Indoor) and SRC50MA-S (Outdoor) units.

Cooling Cycle System Diagram

Electrical Wiring Diagrams

Circuit Diagram: 20, 25, 35MA-S

Electrical schematic for 20, 25, and 35MA-S models.

Circuit Diagram: 50MA-S

Electrical schematic for the 50MA-S model.

Parts and Functions

Remote Control Operation

Installation

Safety Precautions for Installation

Crucial safety warnings and precautions for installation work.

Installation Location Selection

Outdoor Unit Installation Procedures

Pipe Connection and Air Purging

Steps for connecting pipes and purging the refrigerant circuit.

Tools for R410A Installation

Maintenance and Troubleshooting

Electrical Parts Failure Diagnosis

Troubleshooting Flowcharts

Diagnostic flowcharts for unit operation and malfunction.

Self-Diagnosis and Error Codes

Explanation of self-diagnosis indications and error code list.

Service Mode Operation

Sensor and Component Checks

Unit Component Error Troubleshooting

Remote Controller Diagnosis

EEV and Fan Motor Checks

Servicing Procedures

Evacuation and Refrigerant Charging

Essential procedures for system evacuation and refrigerant charging.

R410A Refrigerant Information and Safety

Details on R410A properties, safety, and handling.

Mounting Refrigerant Pipes

Refrigerant Recovery Procedures

General procedure for recovering refrigerant from the system.