Control Specification
SiUS12-928_A
55
Function and Control
3.12.1 Fully Closing with Power on
The electronic expansion valve is initialized when the power is turned on. The opening position is
set and the pressure equalization is developed.
3.12.2 Pressure Equalization Control
When the compressor is stopped, pressure equalization control is activated. The electronic
expansion valve opens, and develops pressure equalization.
3.12.3 Opening Limit
Outline
A maximum and minimum opening of the electronic expansion valve is limited.
Detail
A maximum electronic expansion valve opening in the operating room: 450 pulses
A minimum electronic expansion valve opening in the operating room: 75 pulses
The electronic expansion valve is fully closed in the room where cooling is stopped and is opened
at a fixed amount during defrosting.
3.12.4 Starting Operation Control / Changing Operation Room
Keep the electronic expansion valve from opening when the system is starting or the operating room is
changed, and to prevent the system to be from being super heated or liquid back to the compressor.
3.12.5 High Discharge Pipe Temperature
When the compressor is operating, if the discharge pipe temperature exceeds a certain value, the
electronic expansion valve opens and the refrigerant flows to the low pressure side.
This procedure lowers the discharge pipe temperature.
3.12.6 Oil Recovery Function
Outline
The electronic expansion valve opening in the cooling-stopped room must be set to open for a certain
time and at specified intervals so that the oil does not accumulate in the room where cooling has
stopped.
Detail
During cooling operation, every 1 hour of continuous operation, the electronic expansion valves in
the operation stopped room is opened by 80 pulses for specified time.
3.12.7 Gas Pipe Isothermal Control During Cooling
When units are operating in multiple rooms, the gas pipe temperature is detected and the electronic
expansion valve opening is adjusted so that the gas pipe temperature in each room becomes
equal.
When the gas pipe temperature > the average gas pipe temperature,
→
open the electronic expansion valve in that room
When the gas pipe temperature < the average gas pipe temperature,
→
close the electronic expansion valve in that room
The temperatures are monitored every 40 seconds.
Summary of Contents for SUPER MULTI NX G Series
Page 1: ...SiUS12 928_A Applied Models Inverter Multi Heat Pump G Series J Series...
Page 7: ...SiUS12 928_A Table of Contents vi...
Page 10: ...SiUS12 928_A 1 List of Functions Part 1 List of Functions 1 Functions 3...
Page 11: ...SiUS12 928_A List of Functions 2...
Page 17: ...SiUS12 928_A Specifications 8...
Page 23: ...SiUS12 928_A Specifications Specifications 14...
Page 25: ...SiUS12 928_A Printed Circuit Board Connector Wiring Diagram 16...
Page 37: ...SiUS12 928_A Function and Control 28...
Page 69: ...SiUS12 928_A Control Specification Function and Control 60...
Page 71: ...SiUS12 928_A Operation Manual 62...
Page 73: ...SiUS12 928_A Duct Free System Operation Manual 64 2 Duct Free System 2 1 Remote Controller...
Page 84: ...Duct Free System SiUS12 928_A 75 Operation Manual...
Page 85: ...SiUS12 928_A Duct Free System Operation Manual 76 2 8 TIMER Operation...
Page 86: ...Duct Free System SiUS12 928_A 77 Operation Manual...
Page 87: ...SiUS12 928_A Duct Free System Operation Manual 78 2 9 Note for Multi System...
Page 88: ...Duct Free System SiUS12 928_A 79 Operation Manual...
Page 97: ...SiUS12 928_A Slim Duct Built In System Operation Manual 88...
Page 99: ...SiUS12 928_A Service Diagnosis 90...
Page 169: ...SiUS12 928_A Removal Procedure 160...
Page 225: ...SiUS12 928_A Trial Operation and Field Settings 216...
Page 235: ...SiUS12 928_A Appendix 226...