Search with Wattson

Notifications

Clear all

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!

12kW Samsung gen 6 short cycling

Craig1980 · 2022-11-23T23:30:08Z

Good evening. Welcome to my life staring at my ASHP and scratching my head. I've had a Samsung gen 6 12kw ASHP fitted with all new pipework and rads on an eco4 grant so you can guess that I was just handed the room stats for each of the two zones and told to adjust with the stat.The system was set at 55 and no WC. No legionella either (although I've turned this off and will run manually as and when). The house is a medium 5 bed, cavity bead insulation, loft insulation and double glazing. It's a 60s house but modernised and well insulated for its age. It is in West Wales so fairly mild climate. I like to run the house at 18 degrees max so I've set the WC pretty low at 20 and -3, 20 and 31. I'm getting a good COP at around 3.7 although that has dropped to 3.4 today. Using around 16kw including water heating for up to an hour. Temp today is 8-9 degrees and the pump runs for around 7-8 mins, turns off for 18 seconds then runs again for 7-8 mins. It starts at 100w and peaks at 800w. House is sitting at around 19 degrees. Water law is set up on Floor, should it not be set on Fcu and rad? What diffeference would that make? External thermostat #1 and #2 and remote controller room temp are all set on "room temp on/off or WL interlink on/off (water pump 3)". Is that correct? My question is how can I stop the short cycling and how can I improve efficiency? Sorry for all the questions but I've driven myself mad staring at that screen. 🙈🤣

Page 15 / 32 Prev Next

Air Source Heat Pumps (ASHPs)

Last Post by iantelescope 3 years ago

374 Posts

17 Users

63 Reactions

170.4 K Views

RSS

Derek M

(@derek-m)

Illustrious Member Member

Joined: 6 years ago

Posts: 4425

30/11/2022 5:03 pm

Posted by: @craig1980

↑

@derek-m outdoor temp remains the same through cycling process at 6.7 degrees

Is that the temperature indicated on the controller?

ReplyQuote

Craig1980

(@craig1980)

Estimable Member Member

Joined: 4 years ago

Posts: 146

Topic starter 30/11/2022 5:04 pm

@derek-m yes. It's 6.4 now though.

ReplyQuote

Craig1980

(@craig1980)

Estimable Member Member

Joined: 4 years ago

Posts: 146

Topic starter 30/11/2022 5:25 pm

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.

ReplyQuote

Derek M

(@derek-m)

Illustrious Member Member

Joined: 6 years ago

Posts: 4425

30/11/2022 5:31 pm

@craig1980

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.

ReplyQuote

Craig1980

(@craig1980)

Estimable Member Member

Joined: 4 years ago

Posts: 146

Topic starter 30/11/2022 5:37 pm

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.

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.

ReplyQuote

Derek M

(@derek-m)

Illustrious Member Member

Joined: 6 years ago

Posts: 4425

30/11/2022 5:43 pm

Posted by: @craig1980

↑

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.

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.

The temperatures measured on your radiators would indicate that there is very little heat energy being transferred into your home.

ReplyQuote

Derek M

(@derek-m)

Illustrious Member Member

Joined: 6 years ago

Posts: 4425

30/11/2022 5:50 pm

@craig1980

Try pulling up the 'Indoor Zone Status Information' as shown on page 18 in the manual shown below.

Samsung DB68-08470A-03_IB_EHS_Wired_Remote-Control_Kit_EU_Book_EN_200331.pdf

ReplyQuote

Craig1980

(@craig1980)

Estimable Member Member

Joined: 4 years ago

Posts: 146

Topic starter 30/11/2022 6:22 pm

I'll be back home shortly so will do that.

ReplyQuote

Craig1980

(@craig1980)

Estimable Member Member

Joined: 4 years ago

Posts: 146

Topic starter 30/11/2022 9:12 pm

@derek-m here you go. When running.

ReplyQuote

Craig1980

(@craig1980)

Estimable Member Member

Joined: 4 years ago

Posts: 146

Topic starter 30/11/2022 9:13 pm

When stopped for 20 seconds

ReplyQuote

Derek M

(@derek-m)

Illustrious Member Member

Joined: 6 years ago

Posts: 4425

30/11/2022 9:29 pm

@craig1980

Thanks,

Now try monitoring the 'Master Indoor Zone Information', particularly as the 20 second off period ends and the heat pump restarts.

ReplyQuote

Craig1980

(@craig1980)

Estimable Member Member

Joined: 4 years ago

Posts: 146

Topic starter 30/11/2022 9:47 pm

@derek-m here you go. When running.

ReplyQuote

Page 15 / 32 Prev Next

Forum Jump:

Previous Topic

Next Topic

Currently viewing this topic 5 guests.

27 Forums
2,811 Topics
66.5 K Posts
2,412 Online
7,217 Members

Forum Icons: Forum contains no unread posts Forum contains unread posts

Topic Icons: Not Replied Replied Active Hot Sticky Unapproved Solved Private Closed

RE: How much of your renewable and home setup would still work if the internet went down?

Agree but remember to retain your isp router as they wi...

By JamesPa , 1 minute ago
RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps

@susannasaunders Reluctantly I think i agree with @r...

By JamesPa , 7 minutes ago
RE: Why don't people choose heat pumps?

It's swings and roundabouts - during off-peak periods t...

By Temperature_Gradient , 1 hour ago
RE: Adding data centre electricity costs to domestic energy bills?

never ceases to amaze me.. Keeping steel works going ...

By Batpred , 8 hours ago
RE: Electricity price predictions

great session Reminds me why some politicians can be ha...

By Batpred , 9 hours ago
RE: Boiler Upgrade Scheme funding reduced by circa £750 million in 2026 budget

Absolutely agree. The massive Hager CU my vaillant requ...

By Batpred , 9 hours ago
RE: Octopussy cosy 6 experience

People who have a Cosy appear generally to be happy wit...

By JamesPa , 12 hours ago
RE: Hydrogen Ready

I thought the cr*p came first and the biofuel came afte...

By Majordennisbloodnok , 16 hours ago
RE: Aerotherm and weather compensation

@jamespa I replied yesterday with detailed readings whi...

By DavidB , 2 days ago
RE: Marvel Heating liquidation

@editor This is an important point. each winter, you...

By davidnolan22 , 3 days ago
RE: Solar Power Output – Let’s Compare Generation Figures

Very nice. we’ve been super soggy here, but rather m...

By Papahuhu , 4 days ago
RE: DIY powerflushing tutorial

Interesting! I toyed with the idea too. But I installed...

By bobflux , 4 days ago
RE: 15kw pump for 225m2 1990's house - over kill?

@seaviews Agree with the others on sequence: loft first...

By mk1234 , 4 days ago
RE: Vaillant ecoTEC Plus - Flow Temp and Set Up

Heating been on for 4 weeks now, continuous. It's 6C o...

By trebor12345 , 5 days ago

Renewable Heating Hub Heat Pump Forums

12kW Samsung gen 6 short cycling

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Members Online