Specifications
Table Of Contents
- Cover
- Table of Contents
- Part 1 General Information
- Part 2 Specifications
- Part 3 Refrigerant Circuit
- Part 4 Function
- Part 5 Test Operation
- Part 6 Troubleshooting
- Part 7 Appendix
- 1. Piping Diagrams
- 2. Wiring Diagrams for Reference
- 3. List of Electrical and Functional Parts
- 4. Option List
- 5. Piping Installation Point
- 6. Example of connection (R-410A Type)
- 7. Thermistor Resistance / Temperature Characteristics
- 8. Pressure Sensor
- 9. Method of Checking the Inverter’s Power Transistors and Diode Modules
- Part 8 Precautions for New Refrigerant (R-410A)
- Index
- Drawings & Flow Charts
Si34-704 Special Control
Function 101
3.3 Pump-down Residual Operation
3.3.1 Pump-down Residual Operation in Cooling Operation
If the liquid refrigerant stays in the Evaporator at the startup of a compressor, this liquid refrigerant enters the
compressor, thus resulting in diluted oil in the compressor and then degraded lubrication performance.
Consequently, in order to recover the refrigerant in the Evaporator while the compressor stops, the pump-down residual
operation is conducted.
* Actuators are based on RXQ14~18P.
Actuator Master unit operation Slave unit operation
Compressor 124 Hz + OFF + OFF OFF
Outdoor unit fan Fan control OFF
Four way valve OFF OFF
Main motorized valve (EV1) 480 pls 0 pls
Subcooling motorized valve (EV2) 0 pls 0 pls
Hot gas bypass valve (SVP) OFF OFF
Accumulator oil return valve (SVO) ON ON
Ending conditions
• 5 min.
• Master Unit Pe<0.49 MPa
• Master Unit Td>110°C
• Master Unit Pc>2.94 MPa
or