Hello all,
I'm investigating some random DHW overshoots that I get with Evohome.
Basic setup: Evohome (obviously!), no CH valve, DHW valve controlled by BDR, boiler fired by BDR, DHW kit.
See below:
dhw-overshoot.jpg
As you can see, overnight the cylinder is cooling, then the set point kicks in in the morning. At this point, the cylinder doesn't heat, but I assume this is because it's not quite hit the 5C hysteresis I've set. Eventually (around 7am in this graph), it does, the valve opens, etc. Then... WTF happens at 8am??? And then the same in the evening. Cooling cylinder until around 8pm when the valve opens, then at about 9pm something odd happens.
This doesn't happen every day. It can work just fine for 7-10 days, then randomly do it. In this case, it's done it twice in quick succession.
Any ideas?
I'm investigating some random DHW overshoots that I get with Evohome.
Basic setup: Evohome (obviously!), no CH valve, DHW valve controlled by BDR, boiler fired by BDR, DHW kit.
See below:
dhw-overshoot.jpg
As you can see, overnight the cylinder is cooling, then the set point kicks in in the morning. At this point, the cylinder doesn't heat, but I assume this is because it's not quite hit the 5C hysteresis I've set. Eventually (around 7am in this graph), it does, the valve opens, etc. Then... WTF happens at 8am??? And then the same in the evening. Cooling cylinder until around 8pm when the valve opens, then at about 9pm something odd happens.
This doesn't happen every day. It can work just fine for 7-10 days, then randomly do it. In this case, it's done it twice in quick succession.
Any ideas?
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