Mitsubishi Electric SEZ-KD25VAQ User Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Model name
<Indoor unit>
Model name
<Indoor unit>
SEZ-KD25VAQ
SEZ-KD35VAQ
SEZ-KD50VAQ
SEZ-KD60VAQ
SEZ-KD71VAQ
Series SEZ
2012
INDOOR UNIT
WIRED REMOTE CONTROLLER
(option)
ON/OFF
TEMP.

Mitsubishi Electric SEZ-KD25VAQ Specifications

General

Cooling Capacity	2.5 kW
Heating Capacity	3.2 kW
Power Supply	220-240V, 50Hz
Refrigerant	R32
Outdoor Unit Dimensions (HxWxD)	550 x 800 x 285 mm
Outdoor Unit Weight	35 kg

Summary

Component Identification and Functions

Indoor Unit Components

Illustrates the physical parts and airflow pathways of the indoor unit.

Wired Remote Controller Operations

Details the function of each button on the wired remote controller.

Remote Controller Display Indicators

Explains the various indicators and displays on the wired remote controller.

Remote Controller Cautions

Provides important notes and warnings regarding the use of the wired remote controller.

Technical Specifications

Noise Criterion Curves (SEZ-KD25VAQ)

SEZ-KD25VAQ Noise Curves (5Pa)

Noise performance data for SEZ-KD25VAQ at 5Pa external static pressure.

SEZ-KD25VAQ Noise Curves (15Pa)

Noise performance data for SEZ-KD25VAQ at 15Pa external static pressure.

SEZ-KD25VAQ Noise Curves (35Pa)

Noise performance data for SEZ-KD25VAQ at 35Pa external static pressure.

SEZ-KD25VAQ Noise Curves (50Pa)

Noise performance data for SEZ-KD25VAQ at 50Pa external static pressure.

Noise Criterion Curves (SEZ-KD35VAQ)

SEZ-KD35VAQ Noise Curves (5Pa)

Noise performance data for SEZ-KD35VAQ at 5Pa external static pressure.

SEZ-KD35VAQ Noise Curves (15Pa)

Noise performance data for SEZ-KD35VAQ at 15Pa external static pressure.

SEZ-KD35VAQ Noise Curves (35Pa)

Noise performance data for SEZ-KD35VAQ at 35Pa external static pressure.

SEZ-KD35VAQ Noise Curves (50Pa)

Noise performance data for SEZ-KD35VAQ at 50Pa external static pressure.

Noise Criterion Curves (SEZ-KD50VAQ)

SEZ-KD50VAQ Noise Curves (5Pa)

Noise performance data for SEZ-KD50VAQ at 5Pa external static pressure.

SEZ-KD50VAQ Noise Curves (15Pa)

Noise performance data for SEZ-KD50VAQ at 15Pa external static pressure.

SEZ-KD50VAQ Noise Curves (35Pa)

Noise performance data for SEZ-KD50VAQ at 35Pa external static pressure.

SEZ-KD50VAQ Noise Curves (50Pa)

Noise performance data for SEZ-KD50VAQ at 50Pa external static pressure.

Noise Criterion Curves (SEZ-KD60VAQ)

SEZ-KD60VAQ Noise Curves (5Pa)

Noise performance data for SEZ-KD60VAQ at 5Pa external static pressure.

SEZ-KD60VAQ Noise Curves (15Pa)

Noise performance data for SEZ-KD60VAQ at 15Pa external static pressure.

SEZ-KD60VAQ Noise Curves (35Pa)

Noise performance data for SEZ-KD60VAQ at 35Pa external static pressure.

SEZ-KD60VAQ Noise Curves (50Pa)

Noise performance data for SEZ-KD60VAQ at 50Pa external static pressure.

Noise Criterion Curves (SEZ-KD71VAQ)

SEZ-KD71VAQ Noise Curves (5Pa)

Noise performance data for SEZ-KD71VAQ at 5Pa external static pressure.

SEZ-KD71VAQ Noise Curves (15Pa)

Noise performance data for SEZ-KD71VAQ at 15Pa external static pressure.

SEZ-KD71VAQ Noise Curves (35Pa)

Noise performance data for SEZ-KD71VAQ at 35Pa external static pressure.

SEZ-KD71VAQ Noise Curves (50Pa)

Noise performance data for SEZ-KD71VAQ at 50Pa external static pressure.

Indoor Fan Performance Curves

SEZ-KD25VAQ Fan Performance (5Pa)

Fan performance curves for SEZ-KD25VAQ at 5Pa external static pressure.

SEZ-KD25VAQ Fan Performance (15Pa)

Fan performance curves for SEZ-KD25VAQ at 15Pa external static pressure.

SEZ-KD25VAQ Fan Performance (35Pa)

Fan performance curves for SEZ-KD25VAQ at 35Pa external static pressure.

SEZ-KD25VAQ Fan Performance (50Pa)

Fan performance curves for SEZ-KD25VAQ at 50Pa external static pressure.

Indoor Fan Performance Curves (SEZ-KD35VAQ)

SEZ-KD35VAQ Fan Performance (5Pa)

Fan performance curves for SEZ-KD35VAQ at 5Pa external static pressure.

SEZ-KD35VAQ Fan Performance (15Pa)

Fan performance curves for SEZ-KD35VAQ at 15Pa external static pressure.

SEZ-KD35VAQ Fan Performance (35Pa)

Fan performance curves for SEZ-KD35VAQ at 35Pa external static pressure.

SEZ-KD35VAQ Fan Performance (50Pa)

Fan performance curves for SEZ-KD35VAQ at 50Pa external static pressure.

Indoor Fan Performance Curves (SEZ-KD50VAQ)

SEZ-KD50VAQ Fan Performance (5Pa)

Fan performance curves for SEZ-KD50VAQ at 5Pa external static pressure.

SEZ-KD50VAQ Fan Performance (15Pa)

Fan performance curves for SEZ-KD50VAQ at 15Pa external static pressure.

SEZ-KD50VAQ Fan Performance (35Pa)

Fan performance curves for SEZ-KD50VAQ at 35Pa external static pressure.

SEZ-KD50VAQ Fan Performance (50Pa)

Fan performance curves for SEZ-KD50VAQ at 50Pa external static pressure.

Indoor Fan Performance Curves (SEZ-KD60VAQ)

SEZ-KD60VAQ Fan Performance (5Pa)

Fan performance curves for SEZ-KD60VAQ at 5Pa external static pressure.

SEZ-KD60VAQ Fan Performance (15Pa)

Fan performance curves for SEZ-KD60VAQ at 15Pa external static pressure.

SEZ-KD60VAQ Fan Performance (35Pa)

Fan performance curves for SEZ-KD60VAQ at 35Pa external static pressure.

SEZ-KD60VAQ Fan Performance (50Pa)

Fan performance curves for SEZ-KD60VAQ at 50Pa external static pressure.

Indoor Fan Performance Curves (SEZ-KD71VAQ)

SEZ-KD71VAQ Fan Performance (5Pa)

Fan performance curves for SEZ-KD71VAQ at 5Pa external static pressure.

SEZ-KD71VAQ Fan Performance (15Pa)

Fan performance curves for SEZ-KD71VAQ at 15Pa external static pressure.

SEZ-KD71VAQ Fan Performance (35Pa)

Fan performance curves for SEZ-KD71VAQ at 35Pa external static pressure.

SEZ-KD71VAQ Fan Performance (50Pa)

Fan performance curves for SEZ-KD71VAQ at 50Pa external static pressure.

Unit Dimensions and Layout

Indoor Unit Dimensional Layout

Illustrates the overall dimensions and connection points of the indoor unit.

Installation and Maintenance Access

Access Space Configuration Options

Presents various configurations for creating maintenance access spaces around the unit.

Electrical Wiring Diagram

Control Box Wiring Diagram

Detailed schematic of the internal wiring and components of the control box.

Refrigerant Flow Diagram

Refrigerant Flow Schematic

Diagram showing refrigerant path in cooling and heating modes.

Troubleshooting Guide

Troubleshooting Cautions and Self-Check

Safety precautions, general checks, and using the self-check function for diagnostics.

Wired Remote Controller Issues

Diagnosing problems with the wired remote controller and understanding its LED indicators.

Wireless Remote Controller Test Run

Procedure for conducting a test run with the wireless remote controller.

Unit Error Code Diagnosis (Indoor/Outdoor)

Lists error codes and symptoms detected by indoor and outdoor units for troubleshooting.

Self-Diagnosis Action Table

Detailed table linking error codes to abnormal points, causes, and countermeasures.

Troubleshooting Specific Phenomena

LED2 Off/Blinking on Indoor Controller

Troubleshooting steps when LED2 on the indoor controller board is off or blinking.

Controller Board Test Points

Indoor Controller Board Test Points

Diagram showing specific test points and their voltage references on the board.

Key Part Troubleshooting Criteria

Component Trouble Criteria

Criteria for checking thermistors and motor component functionality.

DC Fan Motor Service and Troubleshooting

DC Fan Motor Self-Check Procedure

Step-by-step guide to diagnose issues with the DC fan motor.

Component Disassembly Procedures

Control Box Disassembly

Steps to remove and access the control box components.

Intake Air Thermistor Removal

Procedure for removing the intake air thermistor.

Drainpan and Filter Removal

Steps to remove the drainpan and air filter.

Condenser/Evaporator Thermistor Removal

Procedure for removing the condenser/evaporator thermistor.

Fan and Fan Motor Disassembly

Steps for removing the fan casing, motor cable, fan motor, and Sirocco fan.

Bearing Removal (KD50-60-71VAQ)

Procedure for removing the bearing assembly on specific models.

Heat Exchanger Removal

Steps for removing the heat exchanger unit.