Volumiser placement in Vaillant Arotherm + system?
Hi guys,
I had a Vaillant Arotherm + 7KW installed last week and an trying to get some snagging issues resolved with the installer. I posted on a Vaillant Facebook group and got loads of feedback and yes the lagging is getting sorted! One thing people couldn't agree on was whether the volumiser on the right was in the correct place, or necessary at all and I wondered it anyone on here had any opinions?
The installer said it may have been left on from a Daikin schematic, because that pump was poor at defrosting, but this one is better and that they would be happy to remove it when they come to do other snagging jobs on Friday. I thought I would seek advice on here before I made a decision. The volumiser is the white tank on the right and I believe the grey tank is a 20/25L buffer.
Very happy to have had my pump installed as we have moved from a coal burning multifuel stove, but I am keen to get it as efficient as possible before the installers move on to the next job!
Heat pump is only doing DHW at the moment - 200L tank set at 45C achieving a rough COP of 3.5. Volumiser gets warm to touch.
Best,
Rob
It is difficult to identify from a photo what task each vessel is performing, but the ones in question look more like expansion vessels rather than volumiser or buffer tank.
Can you provide a close-up photo of the nameplate on each device?
Hi Derek,
Thanks for taking a look.
This is the one on the right hand side.
There is no label on the white vessel on the left but it looks to me as if it is probably this:
(Ignore the second photo)
The grey one in the middle doesn't have a label but I think I remember seeing a box with 25L buffer vessel written on it somewhere.
Don't know if that helps at all?
Best,
Rob
The vessel with the nameplate would appear to be the following, which may be being used to add volume to your system. Is it connected within the pipework from your heat pump.
The white and grey vessels appear to be expansions vessels for the primary and secondary water systems. Their purpose is to allow expansion and contraction of the water within the systems due to change in temperature. They should both have a nameplate which may be round the back or on top.
After having a closer look at your original photo, I think that your system is piped up as follows:-
The pipe coming through the floor furthest on the right would appear to be the flow pipe from your heat pump. This feeds up to the tee where it branches via the horizontal pipe to the electrically operated 3 port valve.
The vertical pipe coming out of the top of the 3 port valve connects to the heating coil within the hot water cylinder. The return pipe from the heating coil connects to a tee near the base of the hot water cylinder.
Pipework from this tee is connected to the bottom connection on the volumiser tank. The top connection on this tank is connected to the return pipe to your heat pump via the filter unit. The outlet from the volumiser tank is also connected to the grey expansion vessel.
The bottom port of the 3 port valve is connected to the flow pipe to the heat emitters and disappears into the floor. The return pipe from the heat emitters connects to the tee feeding back to the heat pump via the volumiser tank.
The mains water supply is via the left most pipe coming through the floor. This feeds into the Pressure Reducing Valve (PRV), after which there is pipework connected to the white expansion vessel and also to the bottom of the hot water cylinder. The pipework feeding out of the hot water cylinder is mounted on the top.
To decide whether to remove the volumiser tank or not, you would need to calculate the volume of water within your heating system, and confirm that this volume is greater than the minimum volume specified in the heat pump manual. Leaving the volumiser in place should not be too detrimental even if it is decided that it is no longer required.
Thanks for the run through Derek. So it seems as though it's in the correct position? I think I'll leave it in place and add a bit of insulation around it.
Had a look a the min system volume for defrost cycle for the Arotherm 7kw and it's 55L. I believe our heating system is over 130L so it does seem as if the volumiser is over kill.
@wobby1 thanks for this - yes his advice was reassuring and system is working very well. I was a bit worried after loads of people had pointed out issues with the install on a Facebook group so I thought I would double check on here. Piping has all been lagged now too.
Posted by: @rob-k@wobby1 thanks for this - yes his advice was reassuring and system is working very well. I was a bit worried after loads of people had pointed out issues with the install on a Facebook group so I thought I would double check on here. Piping has all been lagged now too.
I do believe that the 'knowledge' level on facebook can be a dangerous thing. 😋
The bypass is not installed correctly, as it should incorporate the volumizer, which it doesn't.
Technical Manager & Professional Installer: Ultimate Renewables
-
My house is too big and the Vaillant 7kW heat pump can't heat it when temperatures drop below 4C
5 months ago
-
High air source heat pump running costs – Vaillant AroTherm Plus
5 months ago
-
Vaillant arotherm plus heat pump frost protection
6 months ago
-
Air source heat pump problems - NIBE F 2040 ASHP
6 months ago
-
Vaillant aroTHERM plus not level or flat - what base is best under an external unit?
8 months ago
Currently viewing this topic 2 guests.
- 26 Forums
- 2,114 Topics
- 46.4 K Posts
- 35 Online
- 3,410 Members
Latest Posts
-
RE: Who's your electricity provider and what's your tariff?
Watching Gary Does Solar’s latest YouTube video on the ...
By ChandyKris , 10 hours ago
-
Benefits of an extra horizontal loop for GSHP
Hello everyone, We're in the process of installin...
By thewiseoldbird , 14 hours ago
-
RE: Say hello and introduce yourself
Hi @seatonian - Yes, I know Seaton, and I have the Nat...
By Transparent , 22 hours ago
-
RE: Buffers, hot water and cooling
The principal reason that heat pumps have minimum flow ...
By JamesPa , 23 hours ago
-
@seatonian got your email. Will connect you with a reco...
By Mars , 1 day ago
-
RE: Wood burner with ASHP - direct air?
I love the new fully Viking look... best personal avata...
By Mars , 2 days ago
-
RE: No-code, plug-and-play monitoring for your heat pump
I think I have found “The One!” Waveshare ESP32-S3-POE-...
By Grantmethestrength , 3 days ago
-
@downfield and @toddles, this isn’t in the settings cur...
By Mars , 3 days ago
-
RE: Homely launched for Grant Aerona ASHP control
I haven't bought the Aerona Smart Controller (£700!) bu...
By Prunus , 4 days ago
-
RE: Antifreeze top up for my heat pump - is this a rip off?
For the record, Grant supply ethylene glycol for their ...
By Prunus , 4 days ago
-
RE: Compressor attempts start but fails - Nibe Fighter 2005 8kW
@skyefarmer amazing. Well done!
By Mars , 4 days ago
-
RE: Air source heat pump roll call – what heat pump brand and model do you have?
Ebac 5kw - Monobloc R32. Developed and made in UK - Mit...
By marcinwloch69@gmail.com , 6 days ago
-
RE: Is a Valliant Inline 6kW heater a BUS buster?
Just another thought - it might be worth thinking about...
By JamesPa , 6 days ago
-
RE: BUS Grant: removal of all other fossil fuel heat sources
@rikiarn - just have a think as to how much it will cos...
By Transparent , 7 days ago
-
Don't do much digging around.That's best left to the pr...
By Transparent , 7 days ago
-
Hi all, I was wondering if anyone had an idea of how th...
By Wh0am3ye , 7 days ago
-
RE: EBAC re-entering the ASHP market in 2023
@toodles confirm i have Ebac 5kw ASAP + homely and it w...
By marcinwloch69@gmail.com , 7 days ago
-
RE: Compute heat loss from energy used
@jamespa Ebac must be similar to Mitsubishi as they buy...
By marcinwloch69@gmail.com , 7 days ago
-
@pie_eater I have been thinking of adding cooling to my...
By TechnoGeek , 1 week ago
-
RE: Victorian Semi Retrofit / Extension ASHP and UFH Advice
Agree, but you may have a hard time convincing them, as...
By JamesPa , 1 week ago