Posted by Harold Kestenholz - Hydronic Network on November 16, 2001 at 17:07:43:
In Reply to: How to refill the system - keep main water on ? posted by Allan Weinman on November 16, 2001 at 12:04:33:
Keeping the water feed to the pressure reducing valve open will not fill the expansion tank. However, it is better to do as the manufacturer says and close the feed valve. Check the boiler pressure once per month to become aware if a leak develops. The valve is there to make it easy to service and fill the system; it is not a safety valve to replenish the boiler system if it breaks and sends water into the house. If you worry about not being safe if the water level drops, install a low water cutoff; that is a safety device.