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Samsung 12kw efficient running. The little tweaks.

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Air Source Heat Pumps (ASHPs)

Last Post by Dunlorn 1 year ago

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Craig1980

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Topic starter 05/12/2022 10:06 am

@derek-m okay, I'll do that later today. Thanks

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Craig1980

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Topic starter 05/12/2022 6:05 pm

@derek-m I have set the pump to speed 2 of 3 so medium speed. I now have a flow rate of 24 l/pm. From what I understand this is the minimum it should run at (2-2.5 X the KW rating of the heat pump which is 12).

There is now a difference of 3-4 degrees. I knocked it down a degree on the offset but I think I'll put it up again as it's just a little cooler than we'd like but I want to monitor it for a day or two.

I also intend to switch the heating off on a timer for a few hours in the early morning to see if that saves or costs us more.

Just an update really. Thanks

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Craig1980

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Topic starter 05/12/2022 10:22 pm

@derek-m I've found a setting under heat #40**

#405* has an option #4052 that sets the inverter pump to run to adjust delta t.

Is this a setting for the pumps I don't have? It's adjustable in degrees and listed as "target delta t".

Pic of the manual attached.

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Derek M

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05/12/2022 10:46 pm

Posted by: @craig1980

↑

@derek-m I've found a setting under heat #40**

#405* has an option #4052 that sets the inverter pump to run to adjust delta t.

Is this a setting for the pumps I don't have? It's adjustable in degrees and listed as "target delta t".

Pic of the manual attached.

Below is my interpretation of the various settings.

#4051 0 = water pump off 1 = water pump on - speed range 0 to 100% 2 = water pump on - speed range 0 to 70%.

#4052 is the desired setting of the DT, which can be adjusted between 2C and 8C.

#4053 is probably how quickly the system responds to achieve the desired DT.

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Mike H

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06/12/2022 11:50 am

Posted by: @craig1980

↑

@derek-m I have set the pump to speed 2 of 3 so medium speed. I now have a flow rate of 24 l/pm. From what I understand this is the minimum it should run at (2-2.5 X the KW rating of the heat pump which is 12).

There is now a difference of 3-4 degrees. I knocked it down a degree on the offset but I think I'll put it up again as it's just a little cooler than we'd like but I want to monitor it for a day or two.

I also intend to switch the heating off on a timer for a few hours in the early morning to see if that saves or costs us more.

Just an update really. Thanks

You have 2 pumps in series don't you? How do they interact when you change the setting on one pump or did you change both equally? I would have thought the flow rate was determined by the slowest pump or are they cleverer than that?

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Craig1980

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Topic starter 06/12/2022 3:22 pm

@mike-h I have one on the in and one on the out. I adjusted both. I haven't tried just one.

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Craig1980

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Topic starter 06/12/2022 3:24 pm

@derek-m so would these actually make any difference to the difference in flow in and out temps if I adjusted them? I'm getting between 3 & 4 degrees difference now I've slowed down the flow and raised the offset on the temps on home screen back to zero.

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Derek M

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06/12/2022 7:37 pm

Posted by: @craig1980

↑

@derek-m so would these actually make any difference to the difference in flow in and out temps if I adjusted them? I'm getting between 3 & 4 degrees difference now I've slowed down the flow and raised the offset on the temps on home screen back to zero.

What are you thinking of adjusting? Please clarify.

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Craig1980

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Topic starter 06/12/2022 7:40 pm

@derek-m the 405 # settings. Probably 4052 to get my flow and return temps to have a larger difference or have I misunderstood the job of these settings?

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Derek M

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06/12/2022 8:02 pm

Posted by: @craig1980

↑

@derek-m the 405 # settings. Probably 4052 to get my flow and return temps to have a larger difference or have I misunderstood the job of these settings?

The setting of #4052 is the desired value, which would normally be achieved by varying the speed of the water pump within its operational limits. Your system cannot control the speed of your water pump, so changing these settings should have no effect.

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Craig1980

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Topic starter 06/12/2022 8:07 pm

Okay, thanks. I'm not sure I can go much slower on the pumps. 24l/pm now with both pumps on middle speed. Not sure how I can make the temps further apart now. Currently between 2-4 degrees difference on flow and return.

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HughF

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07/12/2022 7:22 am

If you want to see what the flow/return looks like on a 5kW Samsung gen6 with a pwm primary pump, for comparison:

Http://emoncms.org/samsung5kw

This post was modified 1 year 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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