Grettings fellow cyber-cool-dudes!

So this is an odd stuff.. . or at least very weird to me…

We whent to see a client this a 4.5Hp Compressor runnin on 415V, R-22.
for Air condittioning, for A/C duct type machine.

The client says It hears a noise… (pretty nice uh?)

So clean it up the condessor, plug the manifold, start the unit… ohhh the odd…

The system reach almost 450Psi, at the first seconds of the start… o my o my…
but then decrease to a more normal rate… around 300Psi… and then… starts to hunting between 200 and 350Psi… in the video you can get an idea… the condensation temperature also decrease… but the weird part for me , it is this is a system without TXV, is a fixed orifice, so… The low pressure was in 45Psi… way to low for A/C… add a litte refrigerant and get it near 55Psi, still a litte low… but the hunting never stops…



So… Any one has a clue whats happening on the system?

Bad compressor?
Low charge?
Debirs on the orifice?
Bad luck Brian?

Thks!
-Alex.