dpmiller

DHW is called based on cylinder temp, so just put the setpoint to below ambient?

I wonder what effect the heat and cool links have on DHW control?

I've used Inkbird DIN-rail controllers a few times and they're good kit.

Yep, ours is running in cooling mode currently

didn't we have a discussion on this in the past week?

you told a supplier how much money you had to spend? Ouch.

are you absolutely sure the fault is in the cable rather than the light? the windy-on plastic things are called "wire nuts" and we're not in the US so you'd be better off thinking about Wagos...

timezone can work two ways- full on/off, or programmable setpoints. Enable it only for setpoint, then add whatever timezones you need in C105-108. I *think* that these setpoints are then fed into the WC, but I'm not sure if they act as a minimum or maximum...

there's a bit of blurb in the v6.6 manual- and IIRC something slightly more detailed bit chenglish in the original Sprsun manual. But broadly, Day mode allows use of the full performance envelope, Night caps it for low noise, and low is weather comp. However, even the non WC modes throttle compressor speed based on ambient temp so... what might be useful for you is U02- startup differential and shutdown differential. They control how much below setpoint the unit starts, and how it slows down as it approaches setpoint.

Do you really need to weather-compensate the DHW temp? I use the timer function on our iVT9 for what you're proposing, basically doing a set-back of DHW temp overnight and then boosting it just before the end of the E7 timeslot, ready for showers

check tinternet for piccies of the bare valve so you know where to aim for

are you sure the contactors aren't the "other" way round, or their stats set so that the "wrong" one is doing the heavy lifting?

I think the Graf is like the Solido, with a pumped discharge using an airlift? @flanagaj I believe there's now a version of Solido with Nitrate reduction using a dosing system- have you seen it?

it answers the question tho

which uses more tonnes of stone?