Function General; Operation Modes - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C

1. Function General

1.1

Operation Modes

2. Stopping Operation
2.1 When System is in Stop Mode
2.2 Stop due to Malfunction
3. Standby
3.1 Restart Standby
3.2 Crankcase Heater Control
Thermostat ON
4. Rotation Control
4.1 Rotation of Outdoor Units
4.2 Operating Priority and Rotation
of Compressors
5. Startup Control
5.1 Startup Control in Cooling Operation
5.2 Startup Control in Heating Operation
5.3 Startup Control of Function Unit
(only for heating operation at low
outdoor temperature)
Completion of
Startup Control
6. Normal Operation
6.1 List of Functions in Normal
Operation
6.2 Compressor Control
6.3 Electronic Expansion Valve PI Control
6.4 Outdoor Unit Fan Control
6.5 Control for Cooling Operation at
Low Outdoor Air Temperature
6.6 Control for Heating Operation at
Low Outdoor Air Temperature
6.7 Refrigerant Flow Rate Control
7. Protection Control
7.1 High Pressure Protection Control
7.2 Low Pressure Protection Control
7.3 Discharge Pipe Protection Control
7.4 Inverter Protection Control
7.5 STD Compressor Overload Protection
7.6 Cooling Fan Control for
Radiation Fin Temperature of
Function Unit
7.7 Heater Control for Function Unit
Switch Box
*1. If the thermostat turns OFF while "oil return operation" or "defrosting operation" is in progress, "pump down residual
operation" will be initiated after the completion of the oil return operation or the defrosting operation.
*2. Numbers put ahead of control names are corresponding to the section numbers of Detailed Control Functions provided
on pages after the next, respectively. For detail, refer to information in the "Detailed Control Functions" section.
Function
Establishment of conditions
for oil return operation
Establishment of conditions
for defrosting operation
8. Special Control
8.1 Pump down Residual
Operation
Thermostat OFF
8.2 Oil Return Operation
(See *2)
8.3 Defrost Operation
(See *2)
8.4 Emergency Operation

Function General

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