Grant Aerona3 13kW Noisy pipes after balancing
Hi @grantmethestrength, looks like your pump setting is on speed 3 in your Grant ASHP, grab the installation manual, read up on circulator pump dip switch settings and drop it to speed 2, circa 3000rpm. You may have to open up some rad lockshields and recheck, but getting a pump speed appropriate to the required flow with a reasonably open circuit is preferable to the pump running flat out against closed valves. The Grant ASHPs are defaulted to speed 3 when supplied, and few installers bother to change that, because throttling the flow on the Grant supplied flow setter/indicator is the lazy, quicker and easier option.
Thanks guys, I will open up the valves again and check the dipper switches when I get home tomorrow. Quick follow up question, if the flow has been limited at the ahem new to me flow valve 😜 if I change the pump speed to 2 do I just open the flow valve up to get say 28l/min or just open it as wide as it can go (well until it gets noisy again lol)? Is there a sweet spot?
Kind Regards
Si
——————————————————————————
Grant Aerona3 13kW
13 x 435w + 13x 480w Solar Panels
Sigenergy 10kW Inverter
16kW Sigenstor battery
@grantmethestrength The new to you flow valve is summat I know not of at this stage but, my gut feeling is that if it is in the water circuit, is partially closed and you have noise then, it is well worth noting its’ position then openi9ng it up fully to see what happens. If at this point, everything runs happily still but the noise hasn’t disappeared, then try the heat pump’s pump by reducing the speed a little. little by little improvements will come your way! Regards, Toodles.
Toodles, he heats his home with cold draughts and cooks his food with magnets.
Posted by: @grantmethestrengthif I change the pump speed to 2 do I just open the flow valve up to get say 28l/min or just open it as wide as it can go (well until it gets noisy again lol)? Is there a sweet spot?
Pretty much, noise is caused by high fluid velocity and turbulence created by restrictions, which is caused by things like nearly closed balance valves, TRVs, etc. Noise is also wasted energy, as is a pump on max speed against partly closed valves which could be on a lower speed setting. Open all the valves up, including the flow setter/indicator, set the primary circulator to an appropriate speed to get the required system velocity, and go from there 🙂
- 26 Forums
- 2,129 Topics
- 46.7 K Posts
- 41 Online
- 5,651 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: Who's your electricity provider and what's your tariff?
My cynical side says this is nothing to do with selling...
By JamesPa , 1 minute ago
-
Without meaning to sound dismissive, @toodles, I think ...
By Majordennisbloodnok , 5 minutes ago
-
RE: Forum updates, announcements & issues
Just to keep everyone in the loop, as the site continue...
By Mars , 21 minutes ago
-
RE: Fast DHW setting on Midea (Clivet) heat pump
@simon-w, is this something you could potentially assis...
By Mars , 11 hours ago
-
RE: Share Your Experiences with Heat Pump Manufacturer Support
Fwiw I called my installer out for the first time a few...
By JamesPa , 16 hours ago
-
RE: New Vaillant aroTherm Plus in black - When will it come to the UK?
@sandy, I'll send Vaillant an email tomorrow and see if...
By Mars , 22 hours ago
-
RE: Long term efficiency degradation
@jamespa yes as I thought thanks. We have a reaso...
By Scalextrix , 1 day ago
-
RE: Who has a V2G EV installation
I agree, but a word of caution. V2X is also sometimes u...
By Majordennisbloodnok , 2 days ago
-
RE: Sunamp Thermino Heat Battery
@jamespa A few days after the installation had been com...
By Toodles , 2 days ago
-
RE: Is your heat pump insured?
My home insurance renewal is due soon meaning I am doin...
By cathodeRay , 4 days ago
-
RE: Planning Permission May 2025
Fair enough. I have read the legislation and MCS020a ...
By JamesPa , 4 days ago
-
RE: How do I choose a single room MVHR to prevent losing heat in my bathroom ?
An update on the Heatsava. It is the most difficult thi...
By heat-pump-newbie , 4 days ago
-
RE: Octopus Cosy & Octopus EV + bidirectional smart tariff, together. What, eh?
I've certainly seen that on their Ts & Cs page but ...
By Majordennisbloodnok , 5 days ago
-
RE: ASHP heat output monitoring
@carlo - not much better, is it. It looks more like a u...
By cathodeRay , 5 days ago
-
RE: Renewables & Heat Pumps in the News
this document extensively describes (in a non-blame, ne...
By Judith , 5 days ago
-
RE: Ecodan - Legionella Operation Time and Target Temperature
Once the white plastic cap is removed, my immersion loo...
By Old_Scientist , 6 days ago
-
RE: Replacing Refrigerant on Mitsubishi Heat Pump
@dgclimatecontrol I don't know, but they were not happy...
By DavidAlgarve , 6 days ago
-
RE: Why do we need pressurised systems?
A good question @toodles. My old open thermal store and...
By AllyFish , 6 days ago
-
RE: 300 Liter Tank - Do I have to heat it all?
Cross references for @martingale Background discussi...
By Transparent , 7 days ago
-
@ecobaker May I ask a question of you please. I too hav...
By Papahuhu , 7 days ago