Is it KISS or constant – weather compensation vs. set flow temperature?
Away at present. Hence the delay. Will get back asap.
Cliff
Okay. I have setup the system using just weather compensation. There is something called 'thermal blockade' on my smart controller which turns off the stat rather than turn it to maximum.
I'm going to video the heat curve but at the moment it starts at 18(20c) and runs to 45(-30). -5c = 33c. The OAT is 10c and the system is stable at 19.5c. I tried a lower curve but the pump cycled as expected, 25c is the lowest it will go.
What's struck me is how cool the rads are. They don't feel they could warm anything! But they do of course. Now we are at the end of March the system's not going to be tested at lower temperatures which to me is the breaker.
To be continued
Cliff
Posted by: @cliffhangerWhat's struck me is how cool the rads are. They don't feel they could warm anything! But they do of course. Now we are at the end of March the system's not going to be tested at lower temperatures which to me is the breaker.
Indeed. Its weird at first but you get used to it and actually it is more comfortable because the temperature gradients are less.
There is a school of thought pursued by some installers that having cool radiators leads to call outs (which is probably true). Thus some installers force a minimum FT of 37, which is roughly the point at which radiators feel warm. This of course increases the cost to the householder.
4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.
We ran our radiations at anywhere between 30-35C over winter. At 30C I struggle to tell they are on. If I place my face over the top of the radiator, I can just about feel warm air convecting on my face. At 32C I can feel they are warm to the touch, and at 35C they are (relatively) positively hot!
I still walk around touching the radiators to see if they are on - I just need to trust the room thermostat, which doesn't lie.
Samsung 12kW gen6 ASHP with 50L volumiser and all new large radiators. 7.2kWp solar (south facing), Tesla PW3 (13.5kW)
Solar generation completely offsets ASHP usage annually. We no longer burn ~1600L of kerosene annually.
I had to laugh at this as I do exactly the same thing, I read on here someone explain it well, the body is running at 36c so anything less will feel cold. As I explain to friends it is actually magic that heats my house!
Kind Regards
Si
——————————————————————————
Grant Aerona3 13kW
13 x 435w + 13x 480w Solar Panels
Sigenergy 10kW Inverter
16kW Sigenstor battery
Hi
Just as an aside. My system is heating only.
What is the best way of turning a weather compensation setup off in the summer? I thought of turning the stat back on to its lowest temp, in this case 10c. Won't go any lower.
Or setting the heating curve to its lowest?
Cliff
@cliffhanger Mine has a 'space heating off' setting! Otherwise turn down thermostat if you have one and it's set up to call for heat
4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.
- 26 Forums
- 2,199 Topics
- 48.4 K Posts
- 77 Online
- 5,854 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: Bosch CS5800i 5kW - Experience So Far
We do like the exhaust air heat pump as a centralised M...
By Steelbadger , 29 minutes ago
-
It’s been an eventful few weeks, and I want to thank Ri...
By Mars , 1 hour ago
-
RE: Solar Thermal DHW and ASHP
@kenbone how is your battery holding up Ken? Still goin...
By Mars , 1 hour ago
-
RE: Air source heat pump roll call – what heat pump brand and model do you have?
Old Samsung R410a unit 9kw, modbused controlled, let Ha...
By KenBone , 2 hours ago
-
RE: Testing new controls/monitoring for Midea Clone ASHP
I had a very similar fault, it sounded like someone too...
By Grantmethestrength , 2 hours ago
-
RE: Replacement Inverter for old FIT system
@bontwoody I have a single string 3kW solar AC inverter...
By Old_Scientist , 5 hours ago
-
Octopus removed our gas meter for free a couple of year...
By robl , 6 hours ago
-
RE: How to Understand Wiring Up a Heat Pump
@renewables345 I completely agree with @transparent a...
By JamesPa , 9 hours ago
-
-
-
RE: Why Air Release Valves and Deaerators are Non-Negotiable
I think that's a key point. An air-release valve shou...
By Transparent , 12 hours ago
-
RE: Say hello and introduce yourself
Hello everyone. My partner and I recently had a Bosch C...
By Steelbadger , 13 hours ago
-
RE: Heat Pump Installers: Competence, Illusion and the Hard Truth Homeowners Must Face
@pirate-rich there’s a lot to do and plan, and the wish...
By Mars , 1 day ago
-
RE: Help me keep the faith with my air source heat pump installation
@adamk Its a bit complex: My 28mm primaries run for a...
By JamesPa , 1 day ago
-
Can you separate out the scop data between hot water an...
By Andrew J H , 1 day ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
Further, these bar charts may throw a few more lumens o...
By Toodles , 1 day ago
-
RE: Heat pump and wifi kit connection.
Wi-Fi kit covers any Samsung device that has a modem in...
By Alfapat , 2 days ago
-
RE: Sizing - Save me from my headache
If you get an R290 pump you should be able to heat the ...
By JamesPa , 2 days ago