HI,
I am having major issues with an old Daikin R 22 vrv.
The initial problem was that although excellent in heating mode on all 8 indoor fan coils the system failed to cool at all. (air off coil approx 24 degree.) The condenser is running like its working fine and outlet pipe temps are good. I tried my valve puller on the 4 way valve and a couple of times the system went into cooling and did a gret job only to die off again after a day or 2. i therefor changed said 4 way valve and head but the vrv is suffering with exactly the same problem now. There is frost forming on the pipe between the accumulator and inverter compressor. Any ideas people?