Unvented Cylinder Tee Off

[townfanjon]

In.the earlier thread u see i mentioned that the new heatrae sadia valves dont have a exp vess port

The MI’s will tell you

 

[chris watkins]

In.the earlier thread u see i mentioned that the new heatrae sadia valves dont have a exp vess port

So the tee for any expansion vessel connection must go in between the cold feed connection to the cylinder and the expansion safety valve fitting as that contains the check valve, required by the Water Regs.
The balanced cold would need to tee off in between the expansion safety valve fitting and the pressure reducing valve, all as per manufacturers instructions.
or the expansion vessel tee could go on the hot outlet but they don't last long if rubber is heated and if you run any length of pipe to stop this you run the risk of problems with stagnation.

 

[ColinM]

Ok.... so by default, the combi valves must incorporate a take off port for the balanced cold?

 

[Scott_D]

Ok.. so by default, the combi valves must incorporate a take off port for the balanced cold?

Not if the check valve is separate

 

[ColinM]

Ok I understand, thankyou. Your explanation has made the penny drop. Thanks again