View Full Version : Daikin VRV IV problems with IDU noise on heating

Lauri Aav
03-11-2016, 04:40 PM

I have problem involving Daikin VRV Indoor units on heating mode:
1) When IDU is switched off, the expansion valve still lets refrigerant go through the heat exchanger , making a lot of sizling noise.
2) Also, because the site has small rooms, IDU unit still heats up the room without even working.

I know that the expansion valve opening is necessary for oil return , but the problem is big and i need some solution to it. Theres no room for duct units. IDU have expansion valves in them.
The site is an old hotel with small rooms , and guest are complaining. Im not the installer, but sent solve the problem

Thanks for help!