Service Manual
Table Of Contents
- Cover
- Table of contents
- Part 1 List of Functions
- Part 2 Specifications
- Part 3 Printed Circuit Board Connector Wiring Diagram
- Part 4 Refrigerant Circuit
- Part 5 Functions and Control
- Part 6 Test Operation and Field Settings
- Part 7 Remote Controller
- Part 8 Troubleshooting
- 1. Troubleshooting with LED
- 2. Service Diagnosis
- 3. Error Codes and Description
- 4. Troubleshooting for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series
- 5. Troubleshooting for FFQ Series
- 6. Troubleshooting for Branch Provider (BP) Unit
- 7. Troubleshooting for Outdoor Unit
- 8. Thermistor Resistance/Temperature Characteristics
- 9. Pressure Sensor
- 10. Method of Replacing Inverter’s Power Transistors Modules
- Part 9 Appendix
Operation Mode SiUS181631EA
52 Functions and Control
1. Operation Mode
Startup control
Oil return operation
Yes
Yes
No
No
Malfunction/Standby
Normal operation
Indoor unit thermostat ON
No
Yes
Defrosting operation
Indoor unit thermostat ON
Note:
Malfunction/Standby
(R12924)
Indoor unit stop or
thermostat OFF
Operation in
stop mode
Pressure
equalization
prior to startup
Cooling or heating
operation
Oil return IN
conditions are met.
Defrost IN
conditions are met.
Operation
mode c
hange
Malfunction/
Standby
Indoor unit stop or
thermostat OFF
Indoor unit stop or
thermostat OFF
Restart standby
(Compressor stop)
Malfunction/
Standby
Pump-down
residual
operation
If the indoor unit stops or the thermostat turns OFF while
in oil return operation or defrosting operation, pump-down
residual operation is performed on completion of the oil
return operation or defrosting operation.
• Compressor PI control
• Electronic expansion
valve PI control
• Protection control
• Cooling startup
control
• Heating startup
control