I have read a few posts on here stating that to check R410A systems techs run the nitrogen up to 350 psig. Some say 200 psig and I haven't really seen anything yet about R22 (I usually go with the max test pressure on the template, if I can). My problem is my regulator will only give me about 165 psig max. I brought it up to the service manager today and he said he might could get the owner to buy new ones capable of the higher ranges but he wanted something in writing that there was a benefit to the higher pressure testing. I have no idea for where to find such a document, and our service manager doesnt know anything about HVAC, so me trying to explain that testing at closer to the operating pressures did not work. Any body have a clue where I could find something to print and show?