Mitsubishi Electric MFZ-KJ VE Series User Manual

SERVICE MANUAL
Models
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
No. OBH667
REVISED EDITION-D
Indoor unit service manual
MFZ-KJ•VE Series (OBH666)
PARTS CATALOG (OBB667)
MUFZ-KJ25VE
-
E1
,
E2
,
ER1
,
ER2
,
ET1
,
ET2
MUFZ-KJ35VE
-
E1
,
E2
,
ER1
,
ER2
,
ET1
,
ET2
MUFZ-KJ50VE
-
E1
,
E2
,
ER1
,
ER2
,
ET1
,
ET2
MUFZ-KJ25VE
MUFZ-KJ35VE
Please void OBH667 REVISED EDITION-C.
OUTDOOR UNIT
Revision D:
• MUFZ-KJ25VE -
E2
,
ER2
,
ET2
, MUFZ-
KJ35VE -
E2
,
ER2
,
ET2
and MUFZ-
KJ50VE -
E2
,
ER2
,
ET2
have been added.
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 6
5. OUTLINES AND DIMENSIONS ························ 7
6. WIRING DIAGRAM ············································ 8
7. REFRIGERANT SYSTEM DIAGRAM ············· 12
8. PERFORMANCE CURVES ····························· 14
9. ACTUATOR CONTROL ··································· 25
10. SERVICE FUNCTIONS ···································· 26
11. TROUBLESHOOTING ····································· 27
12. DISASSEMBLY INSTRUCTIONS ···················· 50

Mitsubishi Electric MFZ-KJ VE Series Specifications

General

Brand	Mitsubishi Electric
Model	MFZ-KJ VE Series
Category	Air Conditioner
Language	English

Summary

Technical Changes

Part Names and Functions

Accessories

Lists included accessories for the models.

Specification

Noise Criteria Curves

Outlines and Dimensions

Wiring Diagram

Refrigerant System Diagram

Max. Refrigerant Piping Length and Max. Height Difference

Specifies maximum allowed piping length and height difference for the system.

Additional Refrigerant Charge (R410A: g)

Details the amount of refrigerant to add based on piping length.

Performance Curves

8-1. Capacity and Input Curves

Charts showing cooling/heating capacity and input vs. temperatures.

8-2. Capacity and Input Correction by Operational Frequency of Compressor

Correction factors for capacity and input based on compressor frequency.

8-3. How to Operate Fixed-Frequency Operation

Instructions for operating the unit in a fixed-frequency mode.

8-4. Outdoor Low Pressure and Outdoor Unit Current

Graphs showing outdoor low pressure and unit current under various conditions.

Actuator Control

9-1. Outdoor Fan Motor Control

Explains the ON/OFF control logic for the outdoor fan motor.

9-2. R.V. Coil Control

Describes the control sequence for the R.V. coil in different modes.

9-3. Relation Between Main Sensor and Actuator

Shows how sensors interact with actuators in the system.

Service Functions

10-1. Change in Defrost Setting

Procedure to change the defrost finish temperature setting.

10-2. Pre-Heat Control Setting

How to activate/deactivate the pre-heat control function.

Troubleshooting

11-1. Cautions on Troubleshooting

Important precautions and checks before starting troubleshooting.

11-2. Failure Mode Recall Function

How to recall and interpret failure codes from the unit's memory.

11-3. Troubleshooting Check Table

Table mapping symptoms and LED codes to causes and remedies.

11-4. Trouble Criterion of Main Parts

Specifies resistance values and test methods for key components.

11-5. Component and System Diagnostic Flows

Detailed diagnostic flows for component and system troubleshooting.

11-6. Test Point Diagram and Voltage

Diagrams and voltage specifications for testing electronic components.

Disassembly Instructions

12-1 MUFZ-KJ25VE MUFZ-KJ35VE Disassembly

Procedures for disassembling the MUFZ-KJ25VE and MUFZ-KJ35VE models.

12-2 MUFZ-KJ50VE Disassembly

Procedures for disassembling the MUFZ-KJ50VE model.