Modulating heat pumps / spread / too many starts

Well, I can’t explain it and I also can’t say whether the heat pump controls work like that. But generally, it is said that you should keep the spread low and the flow rate high. Because then you can work with lower target flow temperatures. Lower target flow automatically means less compressor power is needed. If the compressor naturally only reaches a certain minimum, which is actually already too high for the target flow, then the question is how your specific heat pump detects this. The Vaillant have an energy integral that builds up or breaks down over time based on the difference between target flow and actual flow. But that doesn’t mean that everyone does it like that (from what I’ve read, that’s more of a Vaillant thing). For you, the best would actually be if you could set a desired room temperature and at the same time a minimum runtime or a lockout time after a heating phase. Then flow and flow rate would somehow be controlled so that the desired room temperature is achieved; through a minimum runtime (e.g. 2 hours) it would be ensured that a run is “worth it,” and if the desired room temperature then rises a bit too high, that’s just how it is. A lockout time (e.g. 3 hours) would in turn ensure that the pump doesn’t start up again right away when the desired room temperature is briefly undershot, and at the same time limit the maximum cycles (in the example 6/day). How you implement that in your system, no idea… sorry

So I can't explain it and I can't say whether the heat pump controls work like that. But generally, it is said that you should keep the spread low and the flow rate high. Because then you can work with lower target supply temperatures. Lower target supply automatically means lower compressor power required. If of course it only reaches a certain minimum, which is actually already too high for the target supply, then the question is how your specific heat pump detects that. The Vaillant have an energy integral that builds up or breaks down over time from the difference between target supply and actual supply. But that does not mean that everyone does it that way (from my readings it's more of a Vaillant thing). For you, the best thing would actually be if you could set a desired room temperature and at the same time a minimum runtime or a lockout time after the heating phase. Then supply and flow would be regulated so that the desired RT is achieved, a minimum runtime (e.g. 2h) would ensure that a run is "worth it" and if the desired RT then goes a bit too high, well, that's just how it is. A lockout time (e.g. 3h) would in turn ensure that the pump does not start again immediately when the desired RT is undershot and at the same time limit the maximum cycles (in the example 6/d). How you implement that in your system, no idea.... Sorry

(1) Thanks for the info. So Vaillant controls the spread, but not directly, rather the integral over time. (2) Unfortunately, with the Ecoforest you cannot specify a minimum runtime. There is a lockout time of 15 minutes between two starts, but it cannot be changed.