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Mitsubishi Electric MUZ-FH06NA User Manual

Mitsubishi Electric MUZ-FH06NA
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SERVICE MANUAL
Models
OUTDOOR UNIT
Indoor unit service manual
MSZ-FH•NA Series (OBH683)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH684
REVISED EDITION-C
PARTS CATALOG (OBB684)
MUZ-FH06NA
MUZ-FH09NA
MUZ-FH12NA
MUZ-FH06NAH
MUZ-FH09NAH
MUZ-FH12NAH
Please void OBH684 REVISED EDITION-B.
Revision C:
• MUZ-FH06NA, MUZ-FH09/12NA-
1
, MUZ-
FH18NA2, MUZ-FH06NAH, MUZ-
FH09/12NAH-
1
and MUZ-FH18NAH2
have been added.
MUZ-FH06NA
MUZ-FH09NA
MUZ-FH09NA
-
1
MUZ-FH12NA
MUZ-FH12NA
-
1
MUZ-FH15NA
MUZ-FH18NA
MUZ-FH18NA2
MUZ-FH06NAH
MUZ-FH09NAH
MUZ-FH09NAH
-
1
MUZ-FH12NAH
MUZ-FH12NAH
-
1
MUZ-FH15NAH
MUZ-FH18NAH
MUZ-FH18NAH2
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································8
6. REFRIGERANT SYSTEM DIAGRAM ··········· 14
7. DATA······················································ 16
8. ACTUATOR CONTROL ····························· 27
9. SERVICE FUNCTIONS ······························ 28
10. TROUBLESHOOTING ······························· 29
11. DISASSEMBLY INSTRUCTIONS ················· 51
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Mitsubishi Electric MUZ-FH06NA Specifications

General IconGeneral
CategoryAir Conditioner
SeriesFH Series
Cooling Capacity6, 000 BTU/h
RefrigerantR410A
Indoor Unit Dimensions (H x W x D)12.4 x 31.5 x 9.8 inches
Outdoor Unit Dimensions (H x W x D)21.3 x 26.8 x 11.2 inches
Voltage208 / 230 V
Operating Temperature (Cooling)14°F to 115°F
Operating Temperature (Heating)-13°F to 75°F
Sound Level19 dB (Indoor), 49 dB (Outdoor)
Power Supply1 Phase, 60 Hz

Summary

Technical Changes

Model Updates and Changes

Details model additions, name changes, and new service part numbers.

Part Names and Functions

Small Capacity Models Identification

Identifies parts and labels for MUZ-FH06/09/12NA/NAH models.

Large Capacity Models Identification

Identifies parts and labels for MUZ-FH15/18NA/NAH models.

Specifications

Outdoor Unit Performance Specifications

Detailed performance data including capacity, power, COP, sound level, and dimensions.

Outline and Dimensions

Dimensions and Clearances for MUZ-FH06/09/12NA/NAH

Provides installation dimensions and required space for smaller unit models.

Dimensions and Clearances for MUZ-FH15/18NA/NAH

Provides installation dimensions and required space for larger unit models.

Wiring Diagrams

Wiring Diagrams for MUZ-FH06/09/12NA/NAH Series

Schematics for outdoor units MUZ-FH06/09/12NA and MUZ-FH06/09/12NAH models.

Wiring Diagrams for MUZ-FH09/12NA/NAH Series

Schematics for outdoor units MUZ-FH09/12NA and MUZ-FH09/12NAH models.

Wiring Diagrams for MUZ-FH15/18NA Series

Schematics for outdoor units MUZ-FH15/18NA models.

Wiring Diagrams for MUZ-FH18NA2 Series

Schematics for outdoor unit MUZ-FH18NA2 models.

Wiring Diagrams for MUZ-FH15NAH/18NAH Series

Schematics for outdoor units MUZ-FH15NAH and MUZ-FH18NAH models.

Wiring Diagrams for MUZ-FH18NAH2 Series

Schematics for outdoor unit MUZ-FH18NAH2 models.

Refrigerant System Diagrams

Refrigerant Flow for MUZ-FH06/09/12NA/NAH

Diagrams illustrating refrigerant flow for MUZ-FH06/09/12NA/NAH models.

Refrigerant Flow for MUZ-FH15/18NA/NAH Series

Diagrams illustrating refrigerant flow for MUZ-FH15/18NA/NAH models.

Refrigerant Piping and Charge Data

Maximum Piping Length and Height Difference

Specifies maximum refrigerant pipe length and height difference limits.

Additional Refrigerant Charge Calculation

Details how to calculate additional refrigerant charge based on piping length.

Performance Data

Cooling Capacity Performance Data

Provides cooling capacity ratings under various indoor/outdoor conditions.

Cooling Capacity Correction Factors

Correction factors for cooling capacity based on refrigerant piping length.

Heating Capacity Performance Data

Provides heating capacity ratings under various indoor/outdoor conditions.

Cooling Performance Curves

Cooling Capacity and Power Consumption Curves

Graphs showing cooling capacity and power consumption vs. outdoor temperature.

Heating Performance Curves

Heating Capacity and Power Consumption Curves

Graphs illustrating heating capacity and power consumption under various conditions.

Condensing Pressure Charts (Cooling)

Condensing and Suction Pressure for MUZ-FH06/09NA/NAH

Charts showing condensing and suction pressures vs. ambient temperature.

Condensing and Suction Pressure for MUZ-FH12/15/18NA/NAH Series

Charts showing condensing and suction pressures vs. ambient temperature.

Pressure Charts (Heating)

Pressure Charts for MUZ-FH06/09/12NA/NAH

Condensing and suction pressure charts for MUZ-FH06/09/12NA/NAH models.

Pressure Charts for MUZ-FH15/18NA/NAH Series

Condensing and suction pressure charts for MUZ-FH15/18NA/NAH models.

Standard Operation Data

Detailed Operation Parameters

Comprehensive table of operational data including capacity, power, and refrigerant details.

Inverter Frequency Correction Factors

Cooling Capacity and Input Correction Curves

Graphs showing capacity and input correction factors for cooling by inverter frequency.

Heating Capacity and Input Correction Curves

Graphs showing capacity and input correction factors for heating by inverter frequency.

Fixed-Frequency Operation Procedure

Actuator Control

Outdoor Fan Motor Control Logic

Details fan motor operation interlocking with the compressor.

Reversing Valve (R.V.) Coil Control

Describes R.V. coil operation in different modes (Heating, Cooling, Dry).

Sensor and Actuator Relationship Matrix

Table showing how sensors relate to compressor, LEV, fan motor, and R.V. coil.

Service Functions

Adjusting Defrost Finish Temperature

Procedure to change the defrost finish temperature setting.

Pre-Heat Control Activation

Instructions for activating pre-heat control to prevent start-up issues.

Troubleshooting Guide

Troubleshooting Precautions and Checks

Important safety and preliminary checks before starting troubleshooting.

Troubleshooting Procedure Steps

General steps for identifying and diagnosing abnormalities.

Failure Mode Recall Function

Indoor/Outdoor Unit Failure Recall Flowchart

Flowchart for recalling failure modes of indoor and outdoor units.

Detailed Outdoor Unit Failure Recall Flowchart

Detailed flowchart for recalling outdoor unit failure modes.

Outdoor Unit Failure Mode Table

Failure Mode and Remedy Mapping

Table correlating failure modes, LED signals, conditions, and remedies.

Additional Outdoor Unit Failure Modes

Extended table of failure modes, conditions, and remedies for outdoor units.

Troubleshooting Check Table

Symptom-Based Troubleshooting Actions

Table mapping symptoms, LED patterns, conditions to specific remedies.

Further Troubleshooting Checks

Additional troubleshooting checks and conditions for specific failure symptoms.

Main Part Trouble Criteria

Component Resistance and Voltage Checks

Criteria for checking resistance and voltage of key components.

Troubleshooting Flowcharts

Inverter and Compressor Check Procedure

Step-by-step guide to check the inverter and compressor.

Open Phase Check

Procedure to check for open phase conditions in the inverter.

Compressor Winding and Operation Checks

Procedures to check compressor winding, operation time, and start failure.

Outdoor Thermistor Diagnosis

Diagnostic steps for checking outdoor thermistors and related components.

Reversing Valve (R.V.) Coil Check

Procedure to check the R.V. coil for proper operation and resistance.

Outdoor Fan Motor Check

Steps to diagnose issues with the outdoor fan motor.

Power Supply Check

Procedure to verify power supply voltage and LED indicators.

Expansion Valve (LEV) Check

Diagnostic steps for checking the expansion valve's operation and resistance.

Inverter P.C. Board Check

Procedure to check the inverter P.C. board, including fuses and LED indications.

Miswiring and Serial Signal Error Check

Guide to identify and resolve miswiring and serial signal errors.

Specific Component and Circuit Checks

Defrost Heater Check

Procedure to check the defrost heater and related components.

Outdoor Refrigerant Circuit Check

Steps to diagnose issues related to the outdoor refrigerant circuit.

Electromagnetic Noise Issues

Troubleshooting Electromagnetic Interference

Steps to diagnose and resolve electromagnetic noise interference with TVs and radios.

Test Point Diagrams and Voltages

Inverter P.C. Board Test Points

Diagrams showing test points and voltage readings on the inverter P.C. board.

Inverter P.C. Board Test Points (MUZ-FH09/12NA/NAH)

Diagrams showing test points for MUZ-FH09/12NA/NAH inverter P.C. boards.

Inverter P.C. Board Test Points (MUZ-FH15/18NA/NAH Series)

Diagrams showing test points for MUZ-FH15/18NA/NAH inverter P.C. boards.

Disassembly Instructions

Disassembly for MUZ-FH06/09/12NA/NAH Series

Step-by-step instructions for disassembling MUZ-FH06/09/12NA/NAH units.

Removing Inverter, P.C. Board, and R.V. Coil

Instructions for removing key electronic components and the R.V. coil.

Removing Thermistors and Sensors

Procedure for removing various temperature sensors from the unit.

Removing Fan Motor and Compressor

Steps for removing the outdoor fan motor, compressor, and 4-way valve.

Disassembly for MUZ-FH15/18NA/NAH Series

Step-by-step instructions for disassembling MUZ-FH15/18NA/NAH units.

Removing Inverter, P.C. Board, and R.V. Coil (MUZ-FH15/18 Series)

Instructions for removing components for MUZ-FH15/18 series units.

Removing Thermistors, Fan Motor, and Compressor (MUZ-FH15/18 Series)

Steps for removing sensors, fan motor, and compressor for MUZ-FH15/18 units.

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