Mitsubishi Electric MUZ-WR24NA-U1 User Manual

Models
MUZ-WR09NA
-
U1
,
U2
MUZ-WR12NA
-
U1
,
U2
MUZ-WR18NA
-
U1
,
U2
MUZ-WR24NA
-
U1
HFC
utilized
R410A
MUZ-WR24NA
PARTS CATALOG (OBB819)
SERVICE MANUAL
No. OBH819
REVISED EDITION-B
Indoor unit service manual
MSZ-WR•NA Series (OBH818)
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················7
5. WIRING DIAGRAM ·····································9
6. REFRIGERANT SYSTEM DIAGRAM ··········· 12
7. DATA······················································ 15
8. ACTUATOR CONTROL ····························· 25
9. SERVICE FUNCTIONS ······························ 26
10. TROUBLESHOOTING ······························· 27
11. DISASSEMBLY INSTRUCTIONS ················· 52
OUTDOOR UNIT
OBH819 REVISED EDITION-A is void.
Revision B:
• MUZ-WR09/12/18NA-
U2
have been added.
• 10-4. The resistant value of the defrost
heater has been corrected.

Mitsubishi Electric MUZ-WR24NA-U1 Specifications

General

Cooling Capacity	24, 000 BTU/h
Energy Efficiency Ratio (EER)	11.5
Seasonal Energy Efficiency Ratio (SEER)	20.5
Refrigerant	R410A
Operating Temperature (Cooling)	14°F to 115°F
Type	Split System
Power Supply	208/230V, 60Hz
Outdoor Unit Dimensions (W x H x D)	33-7/16 x 13 inches

Summary

1 TECHNICAL CHANGES

3 SPECIFICATION

5 WIRING DIAGRAM

6 REFRIGERANT SYSTEM DIAGRAM

7 DATA

7-1. PERFORMANCE DATA

7-4. STANDARD OPERATION DATA

9 SERVICE FUNCTIONS

10 TROUBLESHOOTING

10-1. CAUTIONS ON TROUBLESHOOTING

Outlines essential precautions and checks before performing troubleshooting.

10-2. FAILURE MODE RECALL FUNCTION

Explains how to retrieve stored error codes and failure modes.

10-3. TROUBLESHOOTING CHECK TABLE

Provides a table linking LED indications to abnormal points, conditions, and remedies.

10-4. TROUBLE CRITERION OF MAIN PARTS

Lists resistance criteria for testing main electrical components.

10-5. TROUBLESHOOTING FLOW

Offers detailed flowcharts for diagnosing specific issues like compressor or fan problems.

10-6. TEST POINT DIAGRAM AND VOLTAGE

Shows test points and voltage measurements on the inverter P.C. board.

11 DISASSEMBLY INSTRUCTIONS

11-1. MUZ-WR09NA MUZ-WR12NA MUZ-WR18NA

11-2. MUZ-WR24NA