Recent content by bruce_miranda

Without eBUS monitoring you can't, unfortunately

@fezster are you sure you are calculating d0 correctly. The reason I ask is d0 sets the max boiler heat output but if you can (And I can) measure the actual heat output, you will quite often see a heat output value lower than what you have set in d0 as the boiler modulates down. it could be that.

My boiler was sized correctly for a traditional system. Since installation we have done several things to actually reduce the heat loss. Also I use Evohome and never heat the whole house. That doesn't play nice with a big boiler.

I am still struggling to balance the system to achieve a 20C heat loss per radiator. And at pump speed 2 the boiler goes into S.53. Everything is fine if lots of zone are requesting heat. But the moment there are only 1 or 2 zone that need the heat my boiler is too big even at 18KWs.

How does one calculate the flow rate through the boiler with my pump? I don't have a flow rate gauge on the pipe work.

I building a rig with two temperature sensors at the moment, so I can go around measuring the flow and returns to each radiator. It's slightly made worse by the fact that some TRVs are on the flow but the others on the return. I know they were all dual position TRVs, so that should be fine.

In which case genuine question, how would I separate the system and run it with two pumps?

That is not something I can do myself. I will need a pro to put in a low loss header etc. In a few years when I need a new boiler I might not even need any of this. So trying to get past another winter without feeling too frustrated at myself for not paying more attention to the original install...

Oh no, I was hoping no one would mention balancing! My original installer didn't do anything wrt balancing and since my entire system has TRV based zoning it has always been a struggle to get that balancing done right myself. Anyway, will give that another go. Previous experience of using the...

The pump is on fixed speed 3. When you say move the ABV to lower setting did you mean a lower opening pressure or lower down the number line. It's at 0.3 at the moment, so go to 0.2 or 0.4? The system water has always been clear, and while that is no indication of anything there has never been...

THE UPML AUTO version appears to have 3 Constant speeds and 3 Proportionate speeds, similar to my Alpha2, Hence it caught my attention. Besides it being available as a 130mm model. It is a 25-95 pump. I was not intending to buy the PWM signal driven version. But I wondered why I haven't seen...

Nope, I get an instant notification for an S.53 and I haven't seen one for a long time. I have spent many months of my life with that S.53 code, in the early days of the boiler install, so know it all too well. Ever since the boiler was derated to 30Kw, the S.53 hasn't been seen. And now it's...

See the temperatures of the Flow and Return during start up. Saturday was when max Flow was set to 70C and many zones calling for heat. Today was when flow was set to it's normal max of 60C and generally only 1 or 2 rooms are calling for heat, first thing in the morning.

I don't think my DU144 ABV has been touched. It has been sitting at the factory 0.3 all the while. First of all, would that be the right setting. First thing in the morning it's only 1 single room that is calling for heat. So the flow temperature rises to the max 60C within about 3-5 mins...

That is a long an sorry story where I listened to advice. Also my house is never being heated all at once, so any total heat loss calculations will result in a larger than required boiler, except in my case no calculations were done at all ! The current pump isn't able to shift the heated water...