HI there,

I have looked to previous threads but without finding direct references to this topic.

I am recently facing to more and more heat pumps.

What puzzles me is that, with respect of the past, these heat pumps utilize coils with tubes having reduced diameter with respect of traditional ones.
But at the same time, with respect of the past, I am dealing more and more are heat pumps with a lot of frost problems with respect of the past, ex coil partially frozen, clogging, bad distribution.
In shorts, they are not working suitably.
Heat pump producers justify this coil changing as a solution to save refrigerant, but what I am noticing is that because of tube diameter reduction there are more feedings, smaller diameter capillary tubes exc.
I think that this affects coil distribution and, at the end, the whole equipment operation.

Has anybody of you faced to similar experience ?
Do you think that this bad operation can be correlated to the coil tube diameter reduction or to other issues ?
I am becoming more and more convinced about this.

What do you think ?

Many thanks