CS-MZ20UD3EA — Panasonic Air Conditioner Service Manual (repair manual). Page 2

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  Specifications, designs and contents in this Service Manual are subject to change without notice. 
 
 
TABLE OF CONTENTS
PAGE    
PAGE
1.
 
Safety Precautions ............................................. 3
 
2.
 
Precaution for Using R32 Refrigerant .............. 6
 
3.
 
Specifications ................................................... 10
 
4.
 
Features ............................................................. 16
 
5.
 
Location of Controls and Components .......... 17
 
5.1
 
Indoor Unit .................................................. 17
 
5.2
 
Remote Control .......................................... 17
 
6.
 
Dimensions ....................................................... 18
 
6.1
 
Indoor Unit .................................................. 18
 
7.
 
Refrigeration Cycle Diagram ........................... 19
 
8.
 
Block Diagram .................................................. 20
 
9.
 
Wiring Connection Diagram ............................ 21
 
9.1
 
Indoor Unit .................................................. 21
 
10.
 
Electronic Circuit Diagram .............................. 22
 
10.1
 
Indoor Unit .................................................. 22
 
11.
 
Printed Circuit Board ....................................... 23
 
11.1
 
Indoor Unit .................................................. 23
 
12.
 
Installation Instruction ..................................... 24
 
12.1
 
Indoor Unit .................................................. 25
 
13.
 
Installation and Servicing Air Conditioner 
using R32 .......................................................... 35
 
13.1
 
About R32 Refrigerant ................................ 35
 
13.2
 
Characteristics of R32 Refrigerant ............. 35
 
13.3
 
Refrigerant piping installation • Tools used  
in services ................................................... 37
 
13.4
 
New installation, Relocation,  
Repairing of Refrigerant Cycle System  
The Procedures .......................................... 41
 
13.5
 
Piping installation of R32 ............................ 42
 
13.6
 
Installation, Relocation, and Service .......... 43
 
13.7
 
Repairing of refrigerant cycle /  
Brazing point ............................................... 47
 
13.8
 
<Reference> Analysis method for no error 
code, no cooling / no warming .................... 53
 
14.
 
Operation and Control ..................................... 55
 
14.1
 
Basic Function ............................................ 55
 
14.2
 
Quiet Operation (Cooling Mode/Cooling  
area of Soft Dry Mode) ............................... 58
 
14.3
 
Powerful Mode Operation ........................... 59
 
14.4
 
Timer Control .............................................. 59
 
14.5
 
Auto Restart Control ................................... 59
 
14.6
 
Indication Panel .......................................... 59
 
14.7
 
HA Terminal (HAJEM-A) ............................ 60
 
15.
 
Operation Control  
(For Multi Split Connection) ............................ 62
 
15.1
 
Cooling operation ....................................... 62
 
15.2
 
Soft Dry Operation ...................................... 62
 
15.3
 
Heating Operation ...................................... 62
 
15.4
 
Automatic Operation ................................... 63
 
15.5
 
Indoor Fan Motor Operation ....................... 63
 
15.6
 
Powerful Mode Operation ...........................63
 
15.7
 
Auto Restart Control ...................................63
 
15.8
 
Indication Panel ..........................................63
 
16.
 
Troubleshooting Guide ....................................64
 
16.1
 
Refrigeration Cycle System ........................64
 
16.2
 
Breakdown Self Diagnosis Function ...........66
 
16.3
 
Error Codes Table ......................................67
 
16.4
 
Self-diagnosis Method ................................69
 
17.
 
Disassembly and Assembly Instructions ......97
 
17.1
 
Indoor Electronic Controller, Blower Fan, 
Fan Motor & Drain Motor Removal 
Procedure. ..................................................97
 
18.
 
Fan Performance ........................................... 100
 
18.1
 
CS-MZ20UD3EA ..................................... 100
 
19.
 
Exploded View and Replacement Parts  
List .................................................................. 101
 
19.1
 
Indoor Unit ...............................................  101
 
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