Fujitsu split air conditioner unit Low side valve

[Bagel]

I have a new Fujitsu split unit. It was low on the refrigerant. When I'm trying to remove the gauge I'm getting a strong refrigerant pressure. The low side valve is in shut position. It turned all the way off. Now I can't remove the gauge. Do you think I have defective low side valve.

[install monkey]

low side valve should be open! once installed an comissioned

[Bagel]

I really appreciate if you could give me some guideline. I assume I have defective nipple. But I don't know how to replace it. I have lots of pressure there. The refrigerant is 410A. As soon as I loosen the gauge hose adapter the refrigerant starts coming out under high pressure. If I still remove the hose adapter I'm running out of refrigerant.
Thanks,

[Brian_UK]

There will always be pressure at the Schrader valve.

Use a quick connector in future.

What qualifications do you have to work on refrigerants?

[Bagel]

Thanks for the reply. I'm EPA Universal Certified. We repair commercial refrigeration appliances and commercial bakery equipment.

[martinw58]

with the valve closed the Schrader is open to the system close the valve on the expansion (liquid) line and pump the unit down to remove your gauge