SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································3
2. PART NAMES AND FUNCTIONS······················8
3. SPECIFICATION···············································11
4. WIRING DIAGRAM ··········································13
5. REFRIGERANT SYSTEM DIAGRAM··············15
6. MICROPROCESSOR CONTROL ····················16
7. TROUBLESHOOTING······································16
8. PARTS LIST ·····················································27
Wireless type
Models
MSC-07RV -
(
WH
)
· MU-07RV -
MSC-09RV -
(
WH
)
· MU-09RV -
MSC-12RV -
(
WH
)
· MU-12RV -
MSC-07RV -
(
WH
)
· MU-07RV -
MSC-09RV -
(
WH
)
· MU-09RV -
MSC-12RV -
(
WH
)
· MU-12RV -
MSC-07RV -
(
WH
)
· MU-07RV -
MSC-09RV -
(
WH
)
· MU-09RV -
MSC-12RV -
(
WH
)
· MU-12RV -
MSC-07RV -
(
WH
)
· MUH-07RV -
MSC-09RV -
(
WH
)
· MUH-09RV -
MSC-12RV -
(
WH
)
· MUH-12RV -
MSC-07RV -
(
WH
)
· MUH-07RV -
MSC-09RV -
(
WH
)
· MUH-09RV -
MSC-12RV -
(
WH
)
· MUH-12RV -
MSC-07RV -
(
WH
)
· MUH-07RV -
MSC-09RV -
(
WH
)
· MUH-09RV -
MSC-12RV -
(
WH
)
· MUH-12RV -
MSC-07RV -
(
WH
)
MSC-09RV -
(
WH
)
MSC-12RV -
(
WH
)
Multi system type
MSC-07RV -
(
WH
)
· MUX-10RV -
MSC-09RV -
(
WH
)
· MUX-18RV -
MSC-12RV -
(
WH
)
· MUX-24RV -
Inverter controlled multi system type
· MXZ-18RV -
E2
E2E2
E2E2
E2E2
E5
E5
E5
E4E4
E4E4
E4E4
E3E3
E3E3
E3E3
E2E2
E2E2
E2E2
E4E4
E4E4
E4E4
E3E3
E3E3
E3E3
E2E2
E2E2
E2E2
No. OB252
REVISED EDITION-D
SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
MSC-07RV - MSC-07RV -
MSC-09RV - MSC-09RV -
MSC-12RV - MSC-12RV -
E5E4
E5E4
E5E4
Revision:
• MSC-07RV- , MSC-09RV- and MSC-12RV- have been
added.
• This service manual covers only change points.
Please refer to the service manual OB227 REVISED
EDITION-B for unchanged contents.
OB227 REVISED EDITION-B describes only for the indoor unit
and the connected outdoor unit of MU, MUH, MUX and MXZ
series.
• Please refer to the below service manual as for following models.
MXZ-32SV- : OB254
MXZ-18TV- : OB280
MUX-19TV- , MUX-20TV- and MUX-25TV- : OB284
PUMY-P125YMA and others : OC272 and others, and OC296
R-CONVERTER UNIT
• Please void OB252 REVISED EDITION-C.
E1E1E1
E1
E1
E5E5E5
Indication of model name
OB252D-1.qxp 03.4.22 11:00 AM Page 1