I’ve just had the 5kW version installed with identical 50L volumiser, my installer (Heat Geek Elite) confirmed it was not just for defrost cycle but also ensuring there was enough volume in the circuit to prevent the ASHP cycling as much as it might without it (due to size of my system aside from the volumiser)
Vaillant is better priced, easier to get hold of, easier to quote for, better manufacturer support, no need for indoor unit so fits in a smaller space and vaillant seem to know Their product better than Viessmann BUT the Viessmann controls on the 150a are superior to the Vaillant.
Hello mate - nice install. What is the lagging internally with the " socks " for over the fittings. Only ever used Primary pro or Pump houses own products but this looks great
I’m having two 12kw cascaded , I don’t know enough to be sure whether a none zoned open loop system would work . Ufloor on ground floor radiators on other two which I’m hoping to size sufficiently to balance . I’d like to get it down to 35 flow but currently spec is 50 , which worries me for running cost . Re insulated everything.
We’ve done a similar split upstairs / downstairs cascade with a pair Viessmann vitocals. You will have better low modulation performance and ultimate control in this configuration in my opinion. Not sure you could open loop a true cascade as it would probably need a buffer I would have thought. There is nothing wrong with a buffer, not everyone is interested in chasing the last few percentage of performance. Its a central heating system not formula 1 car
@@lukeb6565 volumiser is piped like that. Prv on volumiser isn’t normal but it is a good a place as any to put it. No valve on exp vess. No need. We could have put an air vent in but doing the vessel like that was a neat solution. Plenty of air vents on the system otherwise. 😎
@@griffithsheating it makes sense, less expensive mixer station/pumps better savings. Is this your standard going forward then? Do you just run one stat for the whole house?
@@gerardfry4876 there is a wireless Vaillant senso comfort controlling it so you can either run it as a room stat or just off a curve with no room influence. Not sure how the customer will want to run it yet.
Going to sound stupid here but how does that comply with G3 requirements if it doesn’t have a two port on the DHW I take it’s interlinked with an overheat stat on the tank?
Not required (it's not shown on the vaillant schematics at least) I don't use 2 ports or over heat stat on gas either if I'm fitting a Viessmann boiler with an ntc sensor on 4 pipe. G3 police haven't arrested me yet... 🚓
@@markfernandes2467 yes. A buffer provides a hydraulic break between the heat pump (primary side) and the system (secondary side). So an additional pump is required for circulation in the secondary side. If the flows are poorly balanced between the primary and secondary side you get what’s called distortion where the heat pump may be delivering 45 degrees but the buffer is only supplying 40 degrees so the heat pump has to run at 50 due to achieve 45 degrees in the system. The upside of a buffer is that you can get away with murder on the system design and the heat pump won’t notice but your efficiency will suffer. There is a bit of dogma around buffers amongst the pseudo online big brains. They’ll decry buffers from the rooftops and smugly rip an install apart because it has a buffer. I have Viessmann systems running buffers with scops almost touching 5 after nearly 2 years. A volumiser is essentially just a big tube of water sitting inline just to increase water volume in the system to help with defrost volume or to increase compressor run times when it’s mild out.
Ufh flow rate is set by the manifold flow setters and the rads can be set with either a flow balancer or flow setting rad valves. Or you could use what’s called a stad valve
@@Allegedly2right bare in mind that your dt will only be at design (5, 7, 10 or whatever) when you are on a design day which is a day below zero degrees outside. Anything more than that the dt will narrow.
Let's just say we had a disagreement about the part L building regs 😄 They claimed all heating systems have to be designed to 45 degrees and I called 🐂💩 and 7 months later I'm still waiting for a BUS grant payment. I guess I'm not cool enough to join their club.
@@jacbisgood2221 designed to 55 due to rad space available but that's knowing the home owner is doing a load of additional insulation in the roof space and floor so will end up around 45/50 mark. It actually was finally signed off and grant paid today as it happens 😎
Open loop amazing, shame the industry is about 2 decades behind.
Cliff hanger at the end 😂. Good work.
That's a tidy install fair play. What kind of cop do you think it will get?
Over 4
Is the volumiser just for the defrost cycle?
I’ve just had the 5kW version installed with identical 50L volumiser, my installer (Heat Geek Elite) confirmed it was not just for defrost cycle but also ensuring there was enough volume in the circuit to prevent the ASHP cycling as much as it might without it (due to size of my system aside from the volumiser)
Nice install! How do you find these compared with the Vitocals?
Vaillant is better priced, easier to get hold of, easier to quote for, better manufacturer support, no need for indoor unit so fits in a smaller space and vaillant seem to know Their product better than Viessmann BUT the Viessmann controls on the 150a are superior to the Vaillant.
Hello mate - nice install. What is the lagging internally with the " socks " for over the fittings. Only ever used Primary pro or Pump houses own products but this looks great
It’s just Armaflex taped with class zero tape 👍🏻
Does the system not have enough volume for the defrost cycle? Would of that you could of got away without the volumizer
I was thinking more of minimum run times when it’s mild out. I have seen Arotherms ice up though even when volume seems to be ok.
Nope, the open loop system becomes the volume you need for Defrost, been installing like this for decades already.
@@kenbone4535 Specially with UFH you have lot of energy mass around in case you need any excess energy for defrost.
Looks like a 3 port volumiser?
I’m having two 12kw cascaded , I don’t know enough to be sure whether a none zoned open loop system would work . Ufloor on ground floor radiators on other two which I’m hoping to size sufficiently to balance . I’d like to get it down to 35 flow but currently spec is 50 , which worries me for running cost . Re insulated everything.
We’ve done a similar split upstairs / downstairs cascade with a pair Viessmann vitocals. You will have better low modulation performance and ultimate control in this configuration in my opinion. Not sure you could open loop a true cascade as it would probably need a buffer I would have thought. There is nothing wrong with a buffer, not everyone is interested in chasing the last few percentage of performance. Its a central heating system not formula 1 car
Shouldn’t volumizer have return come in from top and leave bottom?
Is a PRV normal on a volumiser?
Is there no Tesla valve for maintenance on exspansion vessel on buffer?
Do you not need a bypass?
Wouldn’t you rather air air vent top of volumiser
@@lukeb6565 volumiser is piped like that. Prv on volumiser isn’t normal but it is a good a place as any to put it. No valve on exp vess. No need. We could have put an air vent in but doing the vessel like that was a neat solution. Plenty of air vents on the system otherwise. 😎
What brand is the red and blue mlcp
@@handle1196 tweetop 👍🏻
Are you bending the UFH down to lower temp or just running 45oc with rads?
No blending. Just letting the heat pump do its thing unrestricted.
@@griffithsheating it makes sense, less expensive mixer station/pumps better savings. Is this your standard going forward then? Do you just run one stat for the whole house?
@@gerardfry4876 there is a wireless Vaillant senso comfort controlling it so you can either run it as a room stat or just off a curve with no room influence. Not sure how the customer will want to run it yet.
And if the pump on the HP can’t supply the index circuit with enough flow, would you fit a buffer then?
@@gerardfry4876 yes if my calculations are wrong I’d have to convert the volumiser to a buffer and add another pump.
Going to sound stupid here but how does that comply with G3 requirements if it doesn’t have a two port on the DHW I take it’s interlinked with an overheat stat on the tank?
Not required (it's not shown on the vaillant schematics at least) I don't use 2 ports or over heat stat on gas either if I'm fitting a Viessmann boiler with an ntc sensor on 4 pipe. G3 police haven't arrested me yet... 🚓
@@griffithsheatingBuilding Control would not give you a completion certificate with no 2 Port on the UVC here in Jockoland mate!!!
Great video pal 👊🏻
Which controller devices are used here?
Sensocomfort
Why fit the buffer?
@@markfernandes2467 it’s not a buffer
@@griffithsheating Is there a difference then? What does a vollumiser do then and why did you use one of those?
@@markfernandes2467 yes. A buffer provides a hydraulic break between the heat pump (primary side) and the system (secondary side). So an additional pump is required for circulation in the secondary side. If the flows are poorly balanced between the primary and secondary side you get what’s called distortion where the heat pump may be delivering 45 degrees but the buffer is only supplying 40 degrees so the heat pump has to run at 50 due to achieve 45 degrees in the system. The upside of a buffer is that you can get away with murder on the system design and the heat pump won’t notice but your efficiency will suffer.
There is a bit of dogma around buffers amongst the pseudo online big brains. They’ll decry buffers from the rooftops and smugly rip an install apart because it has a buffer. I have Viessmann systems running buffers with scops almost touching 5 after nearly 2 years.
A volumiser is essentially just a big tube of water sitting inline just to increase water volume in the system to help with defrost volume or to increase compressor run times when it’s mild out.
How do you set the flow rate no one wants to tell you how to do it.
Ufh flow rate is set by the manifold flow setters and the rads can be set with either a flow balancer or flow setting rad valves. Or you could use what’s called a stad valve
@@griffithsheating Cheers it is a Grant Aerona with a low loss header only 9 rads the T1-T2 is only about 2-3 nightmare.
@@Allegedly2right bare in mind that your dt will only be at design (5, 7, 10 or whatever) when you are on a design day which is a day below zero degrees outside. Anything more than that the dt will narrow.
I’m getting to much flow through from heat pump to my diverter on my arotherm and it makes a chudder when switching. Any suggestions to help?
Lovely. Open loop 🔥🔥🔥
😎👍🏻
Good job
We need to talk about K̶e̶v̶i̶n̶ Viessmann
Let's just say we had a disagreement about the part L building regs 😄 They claimed all heating systems have to be designed to 45 degrees and I called 🐂💩 and 7 months later I'm still waiting for a BUS grant payment. I guess I'm not cool enough to join their club.
@@griffithsheating what did you design to? Sounds out of order to me
@@jacbisgood2221 designed to 55 due to rad space available but that's knowing the home owner is doing a load of additional insulation in the roof space and floor so will end up around 45/50 mark. It actually was finally signed off and grant paid today as it happens 😎