Hi there, have a question about my ashp (Altherma 3 H HT).
when the compressor is operating the flow rate oscillates between 29L/m and 31L/m. This oscillation is very quick (I’d say half a second in 31, and down for another half sec in 29 then back up again). I only noticed this as you can hear the pump on the indoor unit sounding almost like it’s getting throttled and it’s quite an annoying sound.
I’ve checked the settings and the pump speed is set to “no limit”. If I set it to say “80%” then I get a flow of about 28L/min constant when compressor is on.
here’s my questions:
* is this limit okay to set? Or am I compromising efficiency?
* why could the “no limit” be behaving like this? As in, where would I look for what’s potentially throttling the pump.
btw, it feeds UFH and the delta is set at 7