Mitsubishi Electric MUZ-HM15NA-U1 User Manual

Models
MUZ-HM09NA
-
U1
,
U8
MUZ-HM18NA
-
U1
MUZ-HM09NA2
-
U1
,
U8
MUZ-HM18NA2
-
U1
MUZ-HM12NA
-
U1
,
U8
MUZ-HM24NA
-
U1
MUZ-HM12NA2
-
U1
,
U8
MUZ-HM24NA2
-
U1
MUZ-HM15NA
-
U1
MUZ-HM15NA2
-
U1
HFC
utilized
R410A
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
MUZ-HM24NA
PARTS CATALOG (OBB747)
INDOOR UNIT
SERVICE MANUAL
OUTDOOR UNIT
No. OBH747
REVISED EDITION-C
OBH747 REVISED EDITION-B is void.
Revision C:
• MUZ-HM09/12NA
-
U1
, MUZ-HM09/12NA2
-
U1
have been added.
Indoor unit service manual
MSZ-HM•NA Series (OBH746)
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. OUTLINES AND DIMENSIONS ······················ 10
5. WIRING DIAGRAM ·········································· 12
6. REFRIGERANT SYSTEM DIAGRAM ············· 15
7. DATA ································································ 19
8. ACTUATOR CONTROL ··································· 32
9. SERVICE FUNCTIONS ··································· 33
10. TROUBLESHOOTING ····································· 34
11. DISASSEMBLY INSTRUCTIONS ···················· 59

Mitsubishi Electric MUZ-HM15NA-U1 Specifications

General

Brand	Mitsubishi Electric
Model	MUZ-HM15NA-U1
Category	Air Conditioner
Language	English

Summary

1 TECHNICAL CHANGES

3 SPECIFICATION

7 DATA

7-1. PERFORMANCE DATA

Presents detailed cooling capacity and correction factors under various conditions.

7-2. PERFORMANCE CURVE

Graphical representation of cooling capacity and power consumption based on operating conditions.

7-3. CONDENSING PRESSURE

7-4. STANDARD OPERATION DATA

Provides standard operational data including capacity, input, and refrigerant circuit parameters.

7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY

9 SERVICE FUNCTIONS

10 TROUBLESHOOTING

10-1. CAUTIONS ON TROUBLESHOOTING

Highlights safety and procedural guidelines to follow before and during troubleshooting.

10-2. FAILURE MODE RECALL FUNCTION

10-3. TROUBLESHOOTING CHECK TABLE

Lists symptoms, LED indications, conditions, and remedies for troubleshooting.

10-4. TROUBLE CRITERION OF MAIN PARTS

Specifies resistance values and checks for key components like thermistors and compressor.

10-5. TROUBLESHOOTING FLOW

Provides step-by-step diagnostic flows for common troubleshooting scenarios.

A How to check inverter/compressor

Guides on how to diagnose issues related to the inverter and compressor.

B Check of open phase

D Check of compressor winding

G Check of outdoor thermistors

① Check of outdoor fan motor

Check of power supply

K Check of LEV (Expansion valve)

Check of inverter P.C. board

Outlines checks for the inverter P.C. board, including fuse, connections, and LED indication.

M How to check miswiring and serial signal error

Guides on diagnosing miswiring and serial signal errors between indoor and outdoor units.

10-6. TEST POINT DIAGRAM AND VOLTAGE

11 DISASSEMBLY INSTRUCTIONS