Operation Mode - Daikin VRV-WIII RWEYQ72PTJU Service Manual

SiUS30-1301
1.2

Operation Mode

System stopping function
Thermostat ON
Startup control
• Cooling startup control
• Heating startup control
• Pressure equalization
startup control
Normal operation
• Cooling operation
• Heating operation
• Cooling/Heating simultaneous operation
• Branch Selector unit & Indoor unit operation
• Slave unit stopping function
• Compressor control
• Electronic expansion valve control
• Heat exchanger mode control
Protection control
• High pressure protection control
• Low pressure protection control
• Discharge pipe protection control
• Inverter protection control
• Refrigerant drift prevention
Function and Control
NO
YES
• Restart standby
• Crankcase heater control
• Pump down residual operation
YES
Thermostat OFF
NO
Determination
Abnormal stop
condition
NO
YES
Cooling/Heating
mode change
NO
IN
Oil return
condition
NO
Water heat IN
exchanger oil return
condition
NO
Function General
• Condensing unit rotation
• Abnormal stop
• Pressure equalization control
Oil return operation
• Cooling oil return operation
• Heating oil return operation
• Water heat exchanger oil
return operation
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