I have just bought a Uniweld RHP400 Nitrogen regulator for leak testing.
In the manual it states that turning the handle counter-clockwise until the handle is loose it will depressurise the regulator.
I can turn it till it falls off and still there is the same pressure in regulator and hose...how do you depressurise it ?
Anyone knows ?
Also I tried it on a Chevy Tahoe which leaks about 7 ounces of refrigerant per week, I have found the leak with dye(it was the pipes for the rear unit) but wanted to test the nitrogen equipment with a vehicle I know leaks to see how much it shows on the gauge.
Problem is I left it with 200psi pressure for 3 hours and it holds the same pressure...and yes, I closed the nitrogen bottle valve !
I expected to see some major pressure drop with that kind of leak.
Edited: Wed August 03, 2011 at 3:35 PM by pinch
the depressurize you turn handle counter clockwise until there is no tension on handle and then bleed hose. The gauge will then decrease its reading.
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