Service manual

SiUS28-902_a
Table of Contents iv
4. Troubleshooting by Indication on
the Centralized Remote Controller......................................................143
4.1 “UE” Malfunction of Transmission between
Centralized Remote Controller and Indoor Unit ...................................143
4.2 “M1” P.C.B. Defect ................................................................................ 145
4.3 “M8” Malfunction of Transmission between
Optional Controllers for Centralized Control ........................................146
4.4 “MA” Improper Combination of Optional Controllers for
Centralized Control .............................................................................. 147
4.5 “MC” Address Duplication, Improper Setting .........................................149
5. Troubleshooting by Indication on the Unified ON/OFF Controller.......150
5.1 Operation Lamp Blinks......................................................................... 150
5.2 Display “Under Host Computer Integrate Control” Blinks
(Repeats Single Blink) ......................................................................... 152
5.3 Display “Under Host Computer Integrate Control” Blinks
(Repeats Double Blink) ........................................................................ 155
Part 8 Appendix ........................................................................ 159
1. Piping Diagrams..................................................................................160
1.1 Outdoor Unit......................................................................................... 160
1.2 Indoor Unit ...........................................................................................161
2. Wiring Diagrams for Reference...........................................................162
2.1 Outdoor Unit......................................................................................... 162
2.2 Indoor Unit ...........................................................................................163
3. Thermistor Resistance / Temperature Characteristics........................166
4. Pressure Sensor .................................................................................168
Part 9 Precautions for New Refrigerant (R-410A) ................... 169
1. Precautions for New Refrigerant (R-410A) .........................................170
1.1 Outline.................................................................................................. 170
1.2 Service Tools .......................................................................................172