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
Protection Control SiUS181631EA
64 Functions and Control
4.4 Inverter Protection Control
Outline Inverter overcurrent protection control and inverter fin temperature control are performed to prevent
tripping due to a malfunction, temporary inverter overcurrent, or radiation fin temperature increase.
Inverter overcurrent protection control
Inverter fin temperature control
Not limited
Limited
Inverter current > 23.8 A
Inverter current > 23.8 A
Inverter current ≥ 24.9 A continues for 260 sec.
&
&
Inverter current
standby
Inverter current ≤ 23.8 A
continues for 3 min.
Without conditions
(R15610)
When occurring 4 times within 60 minutes,
the error code L8 is output.
Inverter current ≤ 23.8 A
Upper limit frequency = max Hz
10 sec.
Matching of frequency
Upper limit frequency: 1-step down
Upper limit frequency: 1-step up
Keeping the current step.
Not limited
Limited
Tfin ≥ 78˚C (172.4˚F)
Tfin ≥ 78˚C (172.4˚F)
Tfin ≥ 83˚C (181.4˚F)
Fin temperature standby
&
&
Tfin ≤ 75˚C (167˚F)
continues for 3 min.
Without conditions
(R19084)
When occurring 4 times within 60 minutes,
the error code L4 is output.
Tfin < 75˚C (167˚F)
Upper limit frequency = max Hz
10 sec.
Matching of frequency
Upper limit frequency: 1-step down
Keeping the current step.
Upper limit frequency: 1-step up