Posted by Harold Kestenholz - Hydronic Network on January 08, 2000 at 18:01:02:
In Reply to: EUREKA! posted by max on January 08, 2000 at 17:49:03:
Keeping the pressure below 30 psig will prevent water releasing from the pressure relief valve. You should not need more than 15 psig to pressurize the system to the top. Try it and vent the air from the system at that pressure. If air and then water won't come out of the top radiator increase the pressure in 2-pound steps until air and water does come out of the top. Twenty-five pounds is the reseating pressure of the relief valve, so you sould always have the pressure below 25 psig.