Having investigated this further I find that if the new pump is installed as was i.e. with flow upwards then:
flow through both motorised valves is in reverse
flow through indirect HW cylinder is: in bottom / out top
flow through boiler is : out bottom / in top
With the above 3 flows...
Whilst replacing a failed Grundfos pump with similar I noticed that if I fit the new pump in the same orientation as previously i.e. pumping upwards in a vertical pipe run, that both the 2 port Honeywell motorised valves (also in vertical pipe runs) will have flow in the opposite direction to...