daikin compressors

[dubati]

hello
i have a few units i look after daikin wise and recently heard a few of the compressors whirring after they turn off satisfied on temp! it only lasts for a few seconds but is quite noisey any ideas??

my guess is they're being forced to run backwards as the pressure equalises??

any cures??

[Brian_UK]

Don't turn 'em off.

[VRVIII]

hello
i have a few units i look after daikin wise and recently heard a few of the compressors whirring after they turn off satisfied on temp! it only lasts for a few seconds but is quite noisey any ideas??

my guess is they're being forced to run backwards as the pressure equalises??

any cures??

Some detail would help

Unit model? chiller/split/sky air/VRV???
Compressor type? Swing/scroll/screw??

[Crash Pilot]

I would say scroll forced backwards.
Is quite common on scrolls. Pressure leaking back throught the discharge port.