Went to a house the other day to deal with a pressure complaint. Whilst I was there I noted that the filling loop had been connected and explained about the risk of backflow. I also explained that the filling loop was also non-compliant with regs (if going by the book, which I do)
I disconnected it for the householder and found that not only had the DCV failed (passing back) but the control valve was also passing.
This is one of the many reasons why I hate seeing DCV's fitted on the boiler side with a single tap on the mains. The DCV should be on the mains tap side and there should be a tap on the boiler side. DCV's aren't designed to be used as a valve for filling ans then holding the pressure indefinitely (although many do).
Think this one had failed becuase the customer was filling her boiler every 2 days and got some sh*te stuck in it. The man in the "Blue Van" told her to do this because the pressure kept dropping in her newly installed system. I told her to get BG back to locate the reason for the pressure drop and to renew the filling loop setup.
Just out of interest - how many of the heating guys on here install filling loops like this?
I disconnected it for the householder and found that not only had the DCV failed (passing back) but the control valve was also passing.
This is one of the many reasons why I hate seeing DCV's fitted on the boiler side with a single tap on the mains. The DCV should be on the mains tap side and there should be a tap on the boiler side. DCV's aren't designed to be used as a valve for filling ans then holding the pressure indefinitely (although many do).
Think this one had failed becuase the customer was filling her boiler every 2 days and got some sh*te stuck in it. The man in the "Blue Van" told her to do this because the pressure kept dropping in her newly installed system. I told her to get BG back to locate the reason for the pressure drop and to renew the filling loop setup.
Just out of interest - how many of the heating guys on here install filling loops like this?