Other Control; Outside Unit Rotation - Daikin VRV - WII Service Manual

Other Control

8. Other Control

8.1

Outside Unit Rotation

In the case of multi-outside-unit system, this outside unit rotation is used to prevent the compressor
from burning out due to unbalanced oil level between outside units.
[Details of outside unit rotation]
In the case of multi-outside-unit system, each outside unit is given an operating priority for the
control.
Outside unit rotation makes it possible to change the operating priority of outside units.
Thus, the system becomes free of compressors that stop over an extended period of time at the
time of partial loading, preventing unbalanced oil level.
[Timing of outside unit rotation]
•
•
Example) The following diagram shows outside unit rotation in combination of 3 outside units.
Starting
control
Normal operation
Master Slave 1 Slave 2
Outside unit
Priority
rotation
* "Master unit", "slave unit 1" and "slave unit 2" in this section are the names for installation.
82
After oil return operation
At the beginning of the starting control
Oil return operation
Priority Priority
1 2 3
Normal operation
Master Slave 1 Slave 2
Priority Priority Priority
3 1
They are determined in installation work, and not changed thereafter. (These names are different
from "master unit" and "slave unit" for control.)
The outside unit connected the control wires (F1 and F2) for the indoor unit should be designated
as master unit
Consequently, The LED display on the main PCB for "master unit", "slave unit 1" and "slave unit
2" do not change. (Refer to the page 95.)
Normal operation
Outside unit
Priority
rotation
Oil return operation
Outside unit
rotation
2
Master Slave 1 Slave 2
Priority Priority
3 1 2
Normal operation
Master Slave 1 Slave 2
Priority Priority
2 3
SiUS30-604
Priority
1
Function