...the zone valves are shut so the hot water in the heat exchanger is not circulating as it ought to.
Once heating demand is satisfied the 2-port spring return motorized valves (MVs) close, hence no circulation.
The wiring diagram in the boiler manual doesn't make any allowance for this, so at best it's inaccurate and at worst just plain wrong.
Reading the data sheet on the V4043 MV it states: "continuous operation of the valve motor at the fully energised position is not recommended."
In this situation what is the best way to open a zone valve on a Honeywell S Plan installation to allow the pump over-run feature to actually circulate the residual hot water?
Once heating demand is satisfied the 2-port spring return motorized valves (MVs) close, hence no circulation.
The wiring diagram in the boiler manual doesn't make any allowance for this, so at best it's inaccurate and at worst just plain wrong.
Reading the data sheet on the V4043 MV it states: "continuous operation of the valve motor at the fully energised position is not recommended."
In this situation what is the best way to open a zone valve on a Honeywell S Plan installation to allow the pump over-run feature to actually circulate the residual hot water?