Detailed Control Functions; Stop Operation; Standby; Rotation Control - Daikin RQYQ140-180PY1 Service Manual

Detailed Control Functions

2. Detailed Control Functions

2.1

Stop Operation

2.1.1 Stop due to Malfunction
In order to protect compressors, if any of the abnormal state occurs, the system will make "stop with thermostat OFF"
and the malfunction will be determined according to the number of retry times.
(Refer to "Malfunction code list" (P.107~) of the troubleshooting for the items to determine the malfunction.)
∗
Operation to determine the malfunction: "Stop the system" and "malfunction code" is displayed on the remote
controller.
2.1.2 When System is in Stop Mode
Stop both the master and slave units.
The four way valves both for heat exchanger switch and piping switch retain the condition before they were stopped.
2.2

Standby

2.2.1 Restart Standby
Used to forcedly stop the compressor for a period of 3 minutes, in order to prevent the frequent ON/OFF of the
compressor and equalize the pressure within the refrigerant system.
In addition, the outdoor fan carry out the residual operation for a while to suppress the acceleration of the pressure
equalizing and melting of the refrigerant to the evaporator.
2.2.2 Crankcase Heater Control
In order to prevent the refrigerant from melting in the compressor oil in the stopped mode, this mode is used to control
the crankcase heater.
Crankcase heater
2.3

Rotation Control

2.3.1 Outdoor Unit Rotation
In the case of multi-outdoor-unit system, this outdoor unit rotation is used to prevent the compressor from burning out
due to unbalanced oil level between outdoor units.
[Timing of outdoor unit rotation]
· At the beginning of startup control
<System with two outdoor units>
Previous time
This time
Next time
<System with three outdoor units>
Previous time
This time
Next time
One time after the next
<System with four outdoor units>
Previous time
This time
Next time
One time after the next
One time after the
next plus one
37
temperature < 70 ˚C
OFF
temperature > 75 ˚C
Outdoor Unit 1 Outdoor Unit 2
Priority 1
Priority 2
Priority 1
Outdoor Unit 1 Outdoor Unit 2
Priority 1
Priority 3
Priority 2
Priority 1
Outdoor Unit 1 Outdoor Unit 2
Priority 1
Priority 4
Priority 3
Priority 2
Priority 1
Discharge pipe
Discharge pipe
Priority 2
Priority 1
Priority 2
Outdoor Unit 3
Priority 2
Priority 1
Priority 3
Priority 2
Outdoor Unit 3
Priority 2
Priority 1
Priority 4
Priority 3
Priority 2
Crankcase heater
ON
Priority 3
Priority 2
Priority 1
Priority 3
Outdoor Unit 3
Priority 3 Priority 4
Priority 2 Priority 3
Priority 1 Priority 2
Priority 4 Priority 1
Priority 3 Priority 4
SiBE341001
Function