Some manufacturers instruct as follows to set a diff pressure by-pass valve. Make good sense.
a) Close off the DPBV fully
b) Open up all zone valves. Fire boiler and pump(s).
c) With your hand on the by-pass loop, slowly begin opening the DPBV. As soon as flow begins through by-pass, you will feel the heat instantly.
d) Back off the know a quarter turn. You are now set.
Some manufacturers instruct as follows to set a diff pressure by-pass valve. Make good sense.
a) Close off the DPBV fully
b) Open up all zone valves. Fire boiler and pump(s).
c) With your hand on the by-pass loop, slowly begin opening the DPBV. As soon as flow begins through by-pass, you will feel the heat instantly.
d) Back off the know a quarter turn. You are now set.