Mitsi electric vrf bc box noisey

[cspeed]

Hi all,

I have been working on a site that has had 4 mitsi electric vrf systems recently installed, Friday evening on my last walk around the building, I can hear a high pitched noise coming from the bc boxes from different systems.

You can hear the gas moving around, coming from the bc box, then there's a high pitched noise for a couple of minutes, which disappears then returns.

Can anybody have a guess at the cause, or has anybody else come across the same thing.

Cheers in advance, Craig

[Darrenp]

Faulty valve in box !!!

[stufus]

Defrost or SV1 bypass opening to control suction pressure in outdoor
Cheers
Stu