Control Specification SiUS121602E72 Function and Control3.13.1 Fully Closing with Power OnThe electronic expansion valve is initialized when the power is turned on. The opening position isset and the pressure is equalized.3.13.2 Pressure Equalizing ControlWhen the compressor is stopped, the pressure equalizing control is activated. The electronicexpansion valve opens and the pressure is equalized.3.13.3 Opening Limit ControlOutline The maximum and minimum opening of the electronic expansion valve are limited.Detail Maximum electronic expansion valve opening in the operating room: 450 pulse Minimum electronic expansion valve opening in the operating room: 64 pulseThe electronic expansion valve is fully closed in a room where cooling operation is stopped and isopened at a fixed degree during defrosting.3.13.4 Starting Operation Control/Changing Operation RoomThe electronic expansion valve opening is controlled when the operation starts, thus preventing thesuperheating or liquid compression.3.13.5 Control when the Frequency ChangesWhen the target discharge pipe temperature control is active, if the target frequency changes to aspecified value in a certain time period, the target discharge pipe temperature control is canceledand the target opening of the electronic expansion valve is changed.3.13.6 Oil Recovery FunctionOutline The electronic expansion valve opening in the cooling stopped room is set as to open for a certaintime at a specified interval so that the oil in the cooling stopped room may not be accumulated.Detail During cooling operation, every 1 hour continuous operation, the electronic expansion valves in theoperation stopped room is opened by 80 pulses for specified time.3.13.7 High Discharge Pipe Temperature ControlWhen the compressor is operating, if the discharge pipe temperature exceeds a certain value, theelectronic expansion valve opens and the refrigerant runs to the low pressure side.This procedure lowers the discharge pipe temperature.
