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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. 🙈🤣

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Craig1980

(@craig1980)

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Topic starter 26/11/2022 2:07 pm

@derek-m sure. It's a Joule tank, Samsung gen6 wired remote and here's an image of the sticker on the outside unit.

Anything else you need?

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Craig1980

(@craig1980)

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Topic starter 26/11/2022 2:41 pm

@derek-m also, Freedom didn't fit my system. Consumer energy solutions did.

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Derek M

(@derek-m)

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26/11/2022 3:02 pm

@craig1980

Below is an extract from the MIM-E03CN manual, which is the recommended controller for use with your heat pump.

Wiring works

Connection guide of additional pump

Case 1) INV. pump

Connect the PWM control external type pump to PWM terminal block and power cable to the external contact terminal

I would suggest that you ask your installer why he did not fit the type of water pump that should be used with your heat pump.

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Craig1980

(@craig1980)

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Topic starter 26/11/2022 3:13 pm

Okay, that's another question for them. Thanks

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Derek M

(@derek-m)

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26/11/2022 3:24 pm

@craig1980

Do you only have the one water pump?

Is your system still short cycling at the same frequency?

One possible problem could be incorrect settings within the controller. If possible go into the installer menu and make a note of any parameter settings that you can find, and then post the results.

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Craig1980

(@craig1980)

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Topic starter 26/11/2022 3:31 pm

@derek-m I have two pumps I believe. You can see both pumps in this pic.

I am still getting short cycling, yes.

What settings do you mean, sorry?

It's entirely possible the settings are incorrect, I've had to wing it to get as far as I have.

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Craig1980

(@craig1980)

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Topic starter 26/11/2022 3:31 pm

Both pumps are the same btw

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Derek M

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26/11/2022 4:13 pm

@craig1980

What is the temperature setting of the two thermostats, and what is their make and model?

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Craig1980

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Topic starter 26/11/2022 4:16 pm

https://www.mrcentralheating.co.uk/neomitis-wireless-rf-7-day-programmable-digital-room-thermostat-white?gclid=Cj0KCQiAj4ecBhD3ARIsAM4Q_jFgjdz2X5_2SP7-EqQRHiqnP7_pnTe5G3LJB7QW34Z2sFOSvZbEh0EaAjp1EALw_wcB

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Derek M

(@derek-m)

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26/11/2022 4:20 pm

@craig1980

Turn both thermostats up to 25C and see if this has any effect on the cycling.

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Craig1980

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Topic starter 26/11/2022 4:25 pm

@derek-m okay, I'm not at home at the moment. I'll do it later and report back. I've made various adjustment to water law which is Samsung for WC. The temp in the house is nice and the COP is acceptable too. Just the cycling. Thanks again

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HughF

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26/11/2022 5:50 pm

The Joule Samsung instructions are available on line, they don’t use a PWM pump. They have a separate interface PCB that comes after the MIM. I’ll see if I can find a link.

I would be inclined to get the installer to wire/plumb it up as per the Midsummer wholesale instructions that give details on how to fit a PWM pump and use the Samsung controller as the room stat.

Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.

My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.

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