Good morning Hugo, It is correct what he does because of the pressure he has, he lacks gas, in low he should be around 100 psi. I recommend you, because it has already happened to me, that you turn on the air and place the manifold down, let some gas escape through the center (to get the air out of the hose of the manifold) and then close the discharge key, when the pressure drops close to zero, close the low key and turn off the engine., disassemble the high and low pipes and check the tabs, surely some loses of the 4 you must have. If you don't find anything like it, make the 4 new tabs before reconnecting the pipes. Put a vacuum pump for 20 min, and then close the low of the manifold and turn off the pump so that it is tight. Wait half an hour, if the -30 psi needle does not return, you release the gas again until it is within the 200 psi you said. Turn it on and connect the bottle dr R $ 410 (it must be head or inverted, and with the dosing valve at the exit of the bottle. Load it very slowly until it reaches 100-110 PSI low, and monitoring with amperometric clamp the consumption of the compressor, which is within the range of the manufacturer. You will realize that when you reach that pressure it will defrost the pipes and cool normally if everything is fine. Luck