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 Outline of Control (Indoor Unit)
Function 121
6.6 Electronic Expansion Valve Control
• Electronic expansion Valve Control
In cooling, to maximize the capacity of indoor unit heat exchanger (evaporator), operate the
electronic expansion valve under PI control so that the evaporator outlet superheated degree
(SH) will become constant.
Furthermore, the default value of the optimal evaporator outlet superheated degree (condenser
outlet subcooled degree) is 5 deg. However, this default value varies with the operating
performance.
Cooling SH=TH
2
-TH
1
SH
: Evaporator outlet superheated degree
TH
1
: Temperature (°C) detected with the liquid thermistor
TH
2
: Temperature (°C) detected with the gas thermistor