Function General SiUS30-604
56 Function
1.2 Operation Mode
System stopping function
(2.1)
Thermostat ON
Thermostat OFF
Malfunction stop
condition
• Malfunction
stop (2.2)
• Pressure equalization control
(4.3)
Oil return operation
• Cooling oil return operation (7.1)
• Heating oil return operation (7.1)
• Water heat exchanger oil
return operation (7.2)
NO
YES
Normal operation
Protection control
YES
IN
IN
YES
Startup control
• Cooling startup control (4.1)
• Heating startup control (4.2)
• Pressure equalization
startup control (4.3)
• Cooling operation (1.3)
• Heating operation (1.3)
• Cooling/Heating simultaneous
operation (1.3)
• BS unit & Indoor unit operation (1.4)
• Slave unit stopping function (2.1)
• Compressor control (5.1)
• Electronic expansion valve control
(5.2)
• Heat exchanger mode control (5.3)
• High pressure protection control (6.1)
• Low pressure protection control (6.2)
• Discharge pipe protection control
(6.3)
• Inverter protection control (6.4)
• Refrigerant drift prevention (7.4)
• Restart standby (3.1)
• Clankcase heater control (3.2)
• Pump-down residual operation (7.3)
NO
NO
NO
NO
NO
Determination
Cooling/Heating
mode change
Oil return
condition
Water heat
exchanger oil return
condition
• Outside unit rotation (8.1)
∗ Figures in the parentheses indicate the description Nos. of functional operation shown in the following
pages.
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