SiBE121135_A Control Specification
Function and Control 124
4.12.1 Fully Closing with Power on
The outdoor electronic expansion valve is initialized when the power is turned on. The opening
position is set and the pressure equalization is developed.
4.12.2 Pressure Equalizing Control
When the compressor is stopped, the pressure equalizing control is activated. The outdoor
electronic expansion valve opens, and develops the pressure equalization.
4.12.3 Opening Limit Control
Outline A maximum and minimum opening of the outdoor electronic expansion valve are limited.
Detail îš„ A maximum outdoor electronic expansion valve opening in the operating room: 450 pulses
îš„ A minimum outdoor electronic expansion valve opening in the operating room: 75 pulses
The outdoor electronic expansion valve is fully closed in the room where cooling is stopped and
is opened at a fixed degree during defrosting.
4.12.4 Starting Operation Control / Changing Operation Room
The outdoor electronic expansion valve opening is controlled when the operation starts, and
prevents superheating or liquid compression.
4.12.5 Control when the Frequency Changes
When the target discharge pipe temperature control is active, if the target frequency is changed
to a specified value in a certain time period, the target discharge pipe temperature control is
canceled and the target opening of the outdoor electronic expansion valve is changed.
4.12.6 Oil Recovery Function
Outline The outdoor electronic expansion valve opening in the cooling stopped room is set as to open
for a certain time 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 outdoor electronic expansion
valves in the operation stopped room is opened by 80 pulses for specified time.
4.12.7 High Discharge Pipe Temperature Control
When the compressor is operating, if the discharge pipe temperature exceeds a certain value,
the outdoor electronic expansion valve opens and the refrigerant runs to the low pressure side.
This procedure lowers the discharge pipe temperature.
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