Hi,

I'm building my own heat pump system. I've selected the compressor, the condenser, the evaporator, the TXV, reversing valve, the refrigerant and fans.

The heating capacity is 220W, its a small system for a scale model of a Eco house.

What's bothering me is, do I need anything else?

Do I need an accumulator, filter drier, check valve and metering deveice?

Do I need a check valve and metering device on the vapor line and the liquid line?

Any feed back would be great!

Cheers, Rob.