Control Specification (09/12 Class) SiUS04-904
48 Function and Control
Detail I Judgment by power consumption
When an output frequency is exceeds 55 Hz and the input current is less than specified value, the
adjustment is made for refrigerant shortage.
II Judgment by discharge pipe temperature
When discharge pipe temperature is 36°F (20°C) higher than target value and the electronic
expansion value opening is 450 pulses (max.), the adjustment is made for refrigerant shortage.
III Judgment by the difference of temperature
When the difference of the temperature is smaller than , it is regarded as refrigerant shortage.
3.13 Forced Operation Mode
Outline Forced operating mode includes only forced cooling.
Detail Forced Cooling
3.14 Additional Functions
3.14.1 Powerful Operation Mode
Compressor operating frequency is increased to PI Maximum. (Maximum. Hz of operating room)
and outdoor unit airflow rate is increased.
3.14.2 Voltage Detection Function
Power supply voltage is detected each time equipment operation starts.
Cooling
room temperature – indoor heat exchanger temperature
7.2°F (4°C)
outdoor heat exchanger temperature – outdoor temperature 7.2°F (4°C)
Heating
indoor heat exchanger temperature – room temperature 7.2°F (4°C)
outdoor temperature – outdoor heat exchanger temperature 7.2°F (4°C)
Item Forced Cooling
Forced operation
allowing conditions
1) The outdoor unit is not abnormal
and not in the 3-minute standby mode.
2) The operating mode of the outdoor
unit is the stop mode.
3) The forced operation is ON.
The forced operation is allowed when
the above “and” conditions are met.
Starting/adjustment If the forced operation switch is
pressed when the above conditions
are met.
1) Command
frequency
68 Hz
2) Electronic
expansion valve
opening
It depends on the capacity of the
indoor unit.
3) Outdoor unit
adjustment
Compressor is in operation
4) Indoor unit
adjustment
The command of forced operation is
transmitted to the indoor unit.
End 1) When the forced operation switch is
pressed again.
2) The operation is to end
automatically after 15 min.
Others The protect functions are prior to all
others in the forced operation.
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