Hi Michael, thanks for the prompt reply.
In fact, I am living in Italy and I thought that 222-A was just the UK country coding for the same model as the Italy country coding 222-S. On the web site photographs look very similar. However, from you clarification I now understand that for the 222-A the external unit probably directly heats (or cool) the water, without need for refrigerant connections to the internal unit, but just water ones. In my Vitocal 222-S the external unit has one fan.
One more point about the EU F - gas regulation is that "hermetically sealed " is also equivalent to a proof that the refrigerant circuit leaks less than 3g/year. Is there any test or certification from Viessmann that this is the case when refrigerant pipes are installed according to standard techniques ?
Moreover, the periodic checks intervals are extended to 2 years if the system implemets ways to detect refrigerant leaks. Would a refrigerant leak always result in Vitotronic displaying some type of fault codes (even indirect ones)?
