Mitsubishi Electric MXZ-3C30NA4-U1 User Manual

PARTS CATALOG (OBB702)
SERVICE MANUAL
OUTDOOR UNIT
Models
MXZ-2C20NA2 -
U1
,
U4
MXZ-2C20NAHZ
MXZ-2C20NA3
-
U1
MXZ-2C20NAHZ2 -
U1
MXZ-2C20NA4 -
U1
MXZ-2C20NAHZ3 -
U1
MXZ-3C24NA MXZ-2C20NAHZ4 -
U1
MXZ-3C24NA2 -
U1
MXZ-3C24NAHZ
MXZ-3C24NA3
-
U1
MXZ-3C24NAHZ2 -
U1
MXZ-3C24NA4 -
U1
MXZ-3C24NAHZ3 -
U1
MXZ-3C30NA MXZ-3C24NAHZ4 -
U1
MXZ-3C30NA2 -
U1
MXZ-3C30NAHZ
MXZ-3C30NA3
-
U1
MXZ-3C30NAHZ2 -
U1
MXZ-3C30NA4 -
U1
MXZ-3C30NAHZ3 -
U1
MXZ-4C36NA MXZ-3C30NAHZ4 -
U1
MXZ-4C36NA2 -
U1
MXZ-4C36NA3 -
U1
MXZ-4C36NA4 -
U1
MXZ-5C42NA
MXZ-5C42NA2
-
U1
MXZ-5C42NA3 -
U1
MXZ-5C42NA4 -
U1
No. OBH702
REVISED EDITION-N
Indoor unit service manual
MSZ-FE·NA Series (OBH542)
MSZ-FH·NA Series (OBH683)
MSZ-GE·NA Series (OBH548)
MSZ-GL·NA Series (OBH732)
MSZ-EF·NA Series (OBH736)
MSZ-FS·NA Series (OBH872)
MFZ-KA·NA Series (OBH568)
MFZ-KJ·NA Series (OBH752)
SLZ-KA·NA Series (OCH487)
SLZ-KF·NA.TH Series (OCH669)
PLA-A·BA Series (OCH420)
PLA-A·EA Series (OCH640)
SEZ-KD·NA Series
PEAD-A·AA Series
PCA-A·KA Series (OCH455)
MVZ-A·AA Series
SVZ-KP·NA Series (MD-1404-K019)
CONTENTS
• INDOOR / OUTDOOR UNIT
COMPATIBILITY TABLE ······················4
1. TECHNICAL CHANGES ······························8
2. SAFETY PRECAUTION ·······························9
3. PART NAMES AND FUNCTIONS ················13
4. SPECIFICATION ······································ 14
5. NOISE CRITERIA CURVES ························30
6. OUTLINES AND DIMENSIONS ··················· 33
7. WIRING DIAGRAM ··································· 39
8. REFRIGERANT SYSTEM DIAGRAM ··········· 62
9. DATA ······················································ 75
10. ACTUATOR CONTROL ··························· 106
11. SERVICE FUNCTIONS ···························· 107
12. TROUBLESHOOTING ······························110
13. DISASSEMBLY INSTRUCTIONS ··············· 141
HFC
utilized
R410A
Revision N:
• 4. SPECIFICATION and 8. REFRIGERANT
SYSTEM DIAGRAM have been corrected.
OBH702 REVISED EDITION-M is void.
MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA
MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2
MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3
MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4

Mitsubishi Electric MXZ-3C30NA4-U1 Specifications

General

Series	MXZ
Cooling Capacity	30, 000 BTU/h
Heating Capacity	33, 000 BTU/h
Refrigerant	R410A
Voltage	208/230V
Phase	1
Compressor Type	Inverter
Number of Zones	3
Operating Temperature (Heating)	-13°F to 75°F
Operating Temperature (Cooling)	14°F to 115°F

Summary

Safety Precautions

Always Observe for Safety

Cautions Related to R410A Refrigerant

Cautions for Refrigerant Piping Work

Wiring Diagram

Refrigerant System Diagram

Service Functions

Pre-Heat Control

Auto Line Correcting

Troubleshooting

Cautions on Troubleshooting

Essential safety precautions to observe before and during troubleshooting procedures.

Failure Mode Recall Function

Method for recalling and interpreting stored fault codes and failure modes from the unit.

Flow Chart of Detailed Outdoor Unit Failure Mode Recall Function

Visual guide to diagnosing outdoor unit failures by analyzing LED blinking patterns and beep signals.

Table of Outdoor Unit Failure Mode Recall Function

Detailed table mapping LED blink codes to abnormal points, conditions, and remedies.

Instruction of Troubleshooting

General flowchart for diagnosing common operational issues based on LED indicators.

Troubleshooting Check Table

Comprehensive table listing symptoms, LED indications, conditions, and remedies for troubleshooting.

Troubleshooting Flow

Specific troubleshooting flowchart for diagnosing "Outdoor unit does not operate" scenarios.

How to Check Miswiring and Serial Signal Error

How to Check Inverter/Compressor

Procedures for checking compressor voltage, winding resistance, and input voltage to the control board.

Check of Outdoor Thermistors

Steps to diagnose thermistor faults by measuring resistance and checking unit operation.

Check of Outdoor Fan Motor

Test Point Diagram and Voltage

Outdoor Control P.C. Board

Outdoor Power P.C. Board

Disassembly Instructions