Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!
I've just watched the outside temp on the display for the whole 8 min run. It starts at 6.6 degrees then by around 4 mins it's dropped to 6.3 degrees then in the last minute or so it climbs back to 6.6 where it cuts out for 20 seconds but starts again when still on 6.6.Â
I'm looking for something changing, during the 20 second period, from the heat pump switching off, to it restarting.
Correct me if I am wrong, that your heat pump runs for 8 minutes or so, switches off for 20 seconds, then runs for a further 8 minutes or so, etc. etc.
A further thing that I find quite surprising is how low are the temperatures of your radiators, your home must be very well insulated.
The next test to try would be to change the controller mode from WC to a fixed LWT of say 35C, and see what effect this has on how your heat pump operates, and what changes occur to the radiator temperatures and room temperatures.
Yes, that's correct. 8 mins on, 20 seconds off then 8 on ad infinitum. There is no change in the outside temp during the 20 seconds.Â
I'm not sure if it's that great on insulation. Cavity wall beads, loft insulation, large double glazed windows but heating sits at 18-18.5 all day. Heat pump is on 24-7.Â
Posted by: @craig1980Yes, that's correct. 8 mins on, 20 seconds off then 8 on ad infinitum. There is no change in the outside temp during the 20 seconds.Â
I'm not sure if it's that great on insulation. Cavity wall beads, loft insulation, large double glazed windows but heating sits at 18-18.5 all day. Heat pump is on 24-7.Â
The temperatures measured on your radiators would indicate that there is very little heat energy being transferred into your home.
Â
Try pulling up the 'Indoor Zone Status Information' as shown on page 18 in the manual shown below.
Thanks,
Now try monitoring the 'Master Indoor Zone Information', particularly as the 20 second off period ends and the heat pump restarts.
- 27 Forums
- 2,758 Topics
- 64.9 K Posts
- 2,756 Online
- 7,162 Members
Join Us!
Installer Finder
Degrees of Separation
Latest Posts
-
RE: Where heat loss surveys seem to go against practical reality
I am amazed that there is not something out there to me...
By JamesPa , 1 hour ago
-
RE: Next steps on my ASHP journey: Radiators and Pipework
@bobflux The hydraulic simulator is very interesting...
By Rob of York , 7 hours ago
-
RE: 7kW EV Charger Options Advice
Thanks. Yes, we have patchy 4G. The only option we had ...
By Rusty , 12 hours ago
-
-
RE: Being screwed over by Volkswagen Audi Group
Thanks, @batpred. That integration is the one I have in...
By Majordennisbloodnok , 1 day ago
-
RE: How Accurate Is My DIY Heat Loss Calculation?
@batpred I suspect it will be more this year. I had 9 ...
By AndrewJ , 1 day ago
-
RE: Surface mount or bury primaries for heat pump installation?
@jamespa It's rusting 🙂
By tomasmcguinness , 1 day ago
-
RE: Glass lined Cylinder for private water supply
Thank you, once again, for your replies. Yes...
By ian33a , 1 day ago
-
It’s been out a few days and Amazon has already attache...
By Mars , 1 day ago
-
RE: Missing flow temperature in Heat Geek proposal
Yes, and this is another point I agree. We did find a f...
By Batpred , 2 days ago
-
RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S
A very good point. In effect, the DHW pipework is an em...
By cathodeRay , 2 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@tim441 Here are those same three month periods for 202...
By Toodles , 4 days ago
-
RE: Adding additional Solar Panels to a DC coupled battery system
@transparent thank you for your reply above. As alway...
By Old_Scientist , 5 days ago
-
RE: Adventures in heat loss calculations
@rob-of-york — thanks for posting this, all very useful...
By cathodeRay , 6 days ago










