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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

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Topic starter 29/11/2022 9:00 pm

But at the beginning of the 8 min cycle they are both within 0.5 degree of each other at 22

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Craig1980

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Topic starter 29/11/2022 9:22 pm

Outside unit heat pump fans run for around 5 mins then it's quiet until 8 mins and 20 seconds then it starts again.

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Derek M

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29/11/2022 10:13 pm

@craig1980

I will have a look at the data and get back to you tomorrow.

In the meantime, with the system running, measure the temperature in the central section of each radiator at both the top and the bottom, along with the relevant room temperature.

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Mike H

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30/11/2022 12:21 pm

Posted by: @transparent

↑

Let's label a few bits:

-- Attachment is not available --

Am I right in thinking that Craig's system (from Joule) does not have a buffer tank? I'm still trying to get my head round the mandatory buffer tank for Samsung ASHP question.

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Craig1980

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Topic starter 30/11/2022 12:57 pm

@mike-h I have two small tanks above the uvc but I'm assuming they aren't buffer tanks? I have a cold water header tank in the loft and the system outside. That's all I have so unless one of those two tanks are a buffer then I don't have one.

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Derek M

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30/11/2022 5:19 pm

@craig1980

Did you measure and record the radiator temperatures?

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Craig1980

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Topic starter 30/11/2022 5:20 pm

@derek-m nearly done. Doing it now.

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HughF

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30/11/2022 5:34 pm

Posted by: @mike-h

↑

Am I right in thinking that Craig's system (from Joule) does not have a buffer tank? I'm still trying to get my head round the mandatory buffer tank for Samsung ASHP question.

It doesn't have a buffer, no...

Which set of instructions say that the samsung needs a buffer?

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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HughF

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30/11/2022 5:35 pm

Posted by: @craig1980

↑

@mike-h I have two small tanks above the uvc but I'm assuming they aren't buffer tanks? I have a cold water header tank in the loft and the system outside. That's all I have so unless one of those two tanks are a buffer then I don't have one.

-- Attachment is not available --

The white one is the expansion vessel for the domestic hot water (from the unvented cylinder) and the grey one is the expansion vessel for the heating/ashp circuit.

As you have an unvented cylinder, there is no need for any tanks in the loft, and also no need for that shower booster pump. I'm not sure why you still have those in your installation.

This post was modified 3 years ago by HughF

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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Derek M

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30/11/2022 5:45 pm

@craig1980

Below is a link for the controller instructions. Select the home screen and monitor the outdoor temperature whilst your system goes through its cycling process.

DOWNLOADCENTER.SAMSUNG.COM "https://downloadcenter.samsung.com/content/UM/202007/20200729135932592/DB68-08470A-03_IB_EHS_Wired_Remote-Control_Kit_EU_Wing_EN_200121.pdf"

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Craig1980

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