Other Control; Outdoor Unit Rotation - Daikin RXYQ72 Serivce Manual

Other Control

5.

Other Control

5.1

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.
[Details of outdoor unit rotation]
In the case of multi-outdoor-unit system, each outdoor unit is given an operating priority for the
control.
Outdoor unit rotation makes it possible to change the operating priority of outdoor 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 outdoor unit rotation]
Example) The following diagram shows outdoor unit rotation in combination of 3 outdoor units.
Starting
control
Normal operation
Master Slave
Outdoor unit
Priority
rotation
* "Master unit" and "slave unit" in this section are the names for installation.
54
After oil return operation
or
After defrosting operation
At the beginning of the starting control
Oil return operation
or defrosting
operation
Priority
1 2
Normal operation
Master Slave
Priority Priority
2 1
They are determined in installation work, and not changed thereafter. (These names are different
from "master unit" and "slave unit" for control.)
The outdoor 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" do not change.
(Refer to the page 56.)
Normal operation
Master Slave
Outdoor unit
Priority
rotation
2
Oil return operation
or defrosting
Normal operation
operation
Outdoor unit
rotation
Priority
1
Master Slave
Priority Priority
1 2
SiUS39-601
Function