Balancing radiators using pipe clamps of FGA

[novicegas]

Hi, First time balancing a heating system using the pipe clamp thermometers. Im thinking you close all trvs then start nearest the boiler and you're looking for a 20 degree difference between flow and return. All sound good, or way off the mark?

 

[Dotty]

12 deg differential, and close all your lockshields down except the first one, leave that 1/2 a turn open.