David-1712

They were left in a drawer along with all the other info for everything in the house. We moved into this house a few months ago. What other flow rate would they be in?

The flow meters at the top - screwing then in or out to get the flow rates. The table has return valve settings on it. Bit confusing when I thought it was just flow settings you can adjust. this photo wasnt taken today. I turned on all the loops and tried to adjust them as per the table starting with the furthest away loop.

Hi, was wondering if anyone can give me a bit of help understanding the flow rates required to run my UFH. I have the below info left with by the previous owner of the house ( we moved in a few months ago and just trying to get my head round everything ) detailing the loops and the return valve settings. I thought I was the flow meters that you adjust not the return valves? I tried to set the flow meters to match the table but I cannot get those settings. Not sure if it’s a pump issue or if these settings are way off? what should the flow meters be set at? I know that’s a little hard to say as heat output & hear loss calcs would need to be done I presume?

Hello, just looking for some advice on my MVHR. We moved into the house a few months ago and the previous owner had this installed when the house was first built in 2013. Didn’t no much, if anything about them but he gave an overview of how it worked. I’ve a few questions though regarding how it should be setup in terms of flow rates, it has been set at 45% normal air flow from the day we moved in. The heat recover part - it seams to be cold air coming into the supply rooms from each ceiling vent. I thought it would of be at least a little warm? there’s an extract in the kitchen, pretty much right above the cooker but don’t feel it does much at all in terms of removing any odours or steam. Same with the bathroom extracts, when the showers on, room still fills up with a lot of condensation. As shower does seem to trigger the humidity sensor and boosts it to 54% How does the summer bypass work on this system? attached some photos of what is installed and also a diagram of the layout the owner left. On the layout drawing there is sum of L/s for trickle and also for boost. Is that what I should be setting up my normal and boost air flow to be? Convert the Litres/sec to cubic meters and hour than work out the percentage of the max flow rate the unit can provide? any other tips to get the most out of the system? With moving in and getting settled, some plumbing jobs to take care first, I’ve only just started to look into the MVHR system now.

Hi Andy, I’ve only just signed up to this site myself - around 1hr ago as had some questions. I’m from Aberdeenshire myself. Always good to see a local. All the best with the new build 👍

Yes, it fires up and sounds as if it’s working hard to keep the temp in the tank. The flow pipe is always very hot to touch so presume it’s going flat out. I was just worried it was potentially undersized for the heating output required - like it was struggling to keep up.

Thanks for the reply. I was worried the system was potentially undersized. Reading johnMo’s comments, perhaps it’s just the current thermostat setting that’s the issue.

Thanks for the reply. I’ll screw up the thermostat on the tank to keep it up at the 75° and run the heating again and see how that goes. Really appreciate the help.

Hello, looking for a bit of advice. I’ve recently moved into a new home and the heating system is completely different to my old house (combi boiler) This house has a thermal storage tank that’s heating by a 18kw Heat only boiler and also has the multi-fuel stove connected to it to provide an additional heat source for the cylinder. Cylinder is kept at 63/64°. I’ve no problem with DHW however if I turn my underfloor heating on (15 loops, ranging in length from 110m to 54m + 3 towel rails for in the bathrooms) my Thermal store cools down to around 30° and seems to stay there, even after an hour of running the heating. I understand that when the heating has been off and the UFH is cold, I’m asking for a big volume of water in all the loops to be heated, however the UFH mixing valve is set to 45°, the water in the tank is showing 30° so my slow to heat UFH system is now even slower due to the temp of the water getting to the manifolds. As mentioned, I have an 18kw Greenstar Ri boiler and a Mcdonalds ThermFlow tank 210L - schematic below of tank and loops for the UFH. 17mm Myson pipe. Is the boiler big enough (output wise) to supply the tank hot water quick enough so I don’t drop below 45° This meaning my UFH manifolds have the correct temp water going to them to start with? Is the tank big enough in capacity to cope with the sudden request to dump the stored hot water into the floor? Combination of both? Am I asking to much of the system and just be prepared to bring each room up to temp slowly? Appreciate your help with this