Jump to content


  • Posts

  • Joined

  • Last visited

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

rhymecheat's Achievements


Member (3/5)



  1. Ah that’s a good shout! I’m gonna look into that! Thanks
  2. I see. Okay I’m gonna try that. It’ll probably take a while to find the right time to come on for a comfortable temperature by the time I come down. by the way, speaking of pumps: My UFH manifold has a Grundfos with 3 speeds plus a setting for constant pressure instead. Should it be set to constant pressure or constant speed?
  3. I see. But what if I also experience this when the flow to the rads is closed and only the downstairs UFH is on? Does that discard the rads pipes or should I still check that?
  4. Yes, there are rads upstairs. Last night I turner the rads thermostat off and the noise was still there so we can probably discard that. I’ve also had the pump running with the compressor off (I believe this is what you’re suggesting) and the noise is still there with the same intensity which indicates it’s probably the pump. It’s rather annoying because I can barely identify the hum during the day to the point that I don’t know if it only happens at night now…
  5. Hi all. I’ve got a split Altherma 3 H HT and the indoor unit is wall mounted in the loft. The loft is insulated but not boarder, apart from the base built specifically for this installation. I’ve attached a picture of the setup up there for clarity. I’ve noticed that if I leave the heating on overnight (at about 35/40C) I hear a constant humming on the top floor that is rather irritating during the night as there are no other competing noises. I’ve measured this noise to about 26dbA at ear level when lying in bed. The hum seems to come from the indoor units pump. It has a configurable pump speed which I’ve already set to the minimum (60%) but it’s still rather loud. Interestingly I would expect the hum to be stronger on the rooms directly below the unit but that’s not true. The room directly below the unit is actually quiet (as is the room that’s further away from the unit, but that one makes sense). It’s the other rooms that seem to have it worse. Again, attached a drawing of the layout for better understanding (green for ground level, black for first floor and red for loft) my questions: 1. Is this Normal and I should just turn the thing off when I want to sleep? 2. How can I reduce this noise further? 3. Why is it not the loudest directly below it? Thank you very much in advance
  6. Ah, however the manifold gauge shows the same temperature I set on the heatpump. And it’s showing a return of about 7C below that so I think it’s looking good in there. Behold… temperatures in there are as expected with a nice delta between leaving and return temperature. Now I’m thinking what I see in that inlet sensor is coming from the buffer tank instead. So today things took a bit of a turn. I turned everything to the max yesterday before bed and let it rip: pump at 55C, unrestricted speed, UFH manifold mixing valve at 55C too and opened all the flow gauges. Temperature downstairs in the morning was 19C which is a tremendous improvement. What surprises me the most though was the consumption: 2/3kwh every hour. The smart meter notes about 10min of pump off followed by about 12min of pump on at about 1kwh (which I’m guessing is topping up the buffer tank). The UFH manifold then showed a delta of less than 3 which indicated to me that I had the flow too fast so I adjusted the zones little by little throughout the day until I got a consistent 7C delta. Ultimately I think I’ll order those self balancing actuators for this. Usage seems stable and the downstairs has been at at constant 19.5C the whole day. good results but I’m still not sure what’s happened. I wonder if I had to do the work of heating the house first.
  7. The second one. Outdoor unit connects to the indoor one which connects to the buffer tank. Then a Grundfos pump (set at speed 3) pumps from that tank to the UFH/rads
  8. If the actuator controls the flow, what does the actual flow gauge do? I’m referring to those glass things with the indicator that you can adjust by rotating it
  9. Interesting… Can I replace thermostat activated actuators with those? What’s happens when the thermostat calls for heat? Are they just constantly on instead? Also, what does the actuator actually do? I thought it just opened/closed the flow of water and the glass gauge controlled the actual flow to that pipe
  10. I see! So let’s say I start increasing the flow. At what stage does it not need increasing anymore? Or should I just crank it up and leave it until the room is warm?
  11. I thought the lower the return the more heat was being kept in the room. You’re saying if I increase the flow for the living room zone it should be warmer? edit: yes. Atm the UFH has been on all night and probably will all day
  12. I’m not sure unfortunately. They’re from a local company. Owner lives a few doors down the road
  13. Yes of course. But I’ll have to do that later today as I really don’t wanna open the bifolds/loft in this cold. Meanwhile, do you think those low temps under the bifolds are normal?
  • Create New...