Quote Originally Posted by chemi-cool View Post
Noise from cup tube expansion are normal, they are far from a machine gun noise
Sound-bite: sssshhhh....ssshhh... ka-ping... ping... ping... ka-ping... sssshhhh.... ka-ping...

What refrigerant are you using?
R-134a

Is it a small 10 to 30 grams drier filter?
See copper drier in pic below, at entrance to capillary. A larger filter-drier exists upstream.

How can you tell the amount of refrigerant? Is there a sight glass?
There is a sight glass. At the moment, a fair amount of bubbles seem to come through - mainly clouds of small size, during operation - the clouds come & go.

It sounds to me that you don't have enough refrigerant or condenser is too small.
I'll run SH trials today to check refrigerant mass (roughly). I do think that the condenser will be under-size, based on the system design. I'll check the performance theoretically, then report back on this.