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16 KW Samsung EHS TDM

Andris · 2022-01-22T14:20:58Z

My System is a 16 kw Samsung EHS TDM. The house is a timber frame construction, built in 2015. Approx. 230m2 with a conservatory. The difference is between the Monoblock, that most of you have that my outdoor unit has no heat exchanger inside. The hot refrigerant comes in the house in to a hydrobox indoor unit. This has the heat exchanger. Just before the hydrobox there is a y pipe connection for the refrigerant to make its way in to a motorised control box. This is connected to 3 air to air aircon unit. Two in my attic one in my conservatory (one would have been enough). The hydro box is connected to my 250 litter horizontal tank (for space issues, but stay away as much as possible from horizontal tanks!) Low loss header, UHF downstairs, radiators upstairs. Coming from a colder country I think everything got oversized a little bit, like the UHF as it was done with 20 mm pipes like it is standard in Hungary. The distribution of the water are done with 2 Wilo pumps, no valves, 2 thermostats, one upstairs one downstairs controlling the pumps and the heat pump. My weather comp. (water law) is set to 40c@-10 25c @15 then on the controlee I changed it to -4. I have tried what people suggested running it at 24/7,4 so I set the wheatear comp lower then 25 Celsius but this system never cycles off so what I see is the inverter makes the machine run as low as possible about 900 to a 1000 watt consumption of electricity, but with all UHF and radiator on the ASHP just produces more heat then the lower flow temp would need, so attchualy the flow temp just rising by the end of the day it goes to at least 27c (even thought it should be like 24c) if the underfloor shuts off then it rises, (even @5 degrees outside) to about 36c as there is a lot less water circulating in the system. Now I know now running it at 24/7 would mean at least 24 kw usage/day. I changed the thermostat setting so it is set to 21c downstairs, 20 upstairs. Starts at 7 am set to run till 10pm but by about 7 pm thermostat shuts it off as it reached the 21c. Downstairs heats up first then upstairs by no later then 8pm. In the morning downstairs the temp is still about 19.8c when it kicks in at 7 am. Upstairs a little bit cooler around 18.5c. I do my own maintenance. I have never had any problem with the heating system, very happy with it. We used a German make Rehau system for the plumbing. By the way we bought everything in Hungary as it was still part of the EU. After getting back the VAT as it was a self build, the entire system cost was around £5000. As I understand we could not get RHI as my brother was not registered installer here plus the system is able to cool too.) Sorry if something doesn't make sense feel free to ask.

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Air Source Heat Pumps (ASHPs)

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Andris

(@andris)

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Topic starter 24/01/2022 8:05 am

No change, I feel as the machine has like the lowest setting it can go. Like the car idles but as the house is well insulated it can't go very low. When it first comes on for 2 hours. I can see it being around 23.5-24c but as the concrete starts warming up and the return is warmer and warmer it will rise to about 28c by the evening. To be honest, I guess I should not complain. It is great it uses about 15kw/day for heating the whole house. At this weather, I think it was 6c outside all day.

16kw Samsung TDM ASHP. 8.4kw PV, power optimizers 20×420watt panels 6kw SolarEdge inverter.

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Kev M

(@kev-m)

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24/01/2022 11:07 am

@andris

my ASHP starts cycling on and off under these circumstances. This is what happens when the outside temp goes fro 6 to 8 degrees. The flow gets too high and the ASHP shuts down for a while.

As you say 15kWh to heat the whole house for a day at 6C is very good. I would use about 25kWh at the same.

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Andris

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Topic starter 24/01/2022 11:31 am

@kev-m Thanks, Kev! I feel better now. 😄 I'll try to raise the weather compensation to have a higher flow temp. Try the aproche off heat up when it is higher ambient temp outside and "freewheel" at night.

16kw Samsung TDM ASHP. 8.4kw PV, power optimizers 20×420watt panels 6kw SolarEdge inverter.

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Derek M

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24/01/2022 12:01 pm

Posted by: @andris

No change, I feel as the machine has like the lowest setting it can go. Like the car idles but as the house is well insulated it can't go very low. When it first comes on for 2 hours. I can see it being around 23.5-24c but as the concrete starts warming up and the return is warmer and warmer it will rise to about 28c by the evening. To be honest, I guess I should not complain. It is great it uses about 15kw/day for heating the whole house. At this weather, I think it was 6c outside all day.

Hi,

The objective of the control system is to maintain the indoor air temperature rather than just minimise the water flow temperature. Where is your controller located and is it set to water flow temperature control, room temperature control or weather compensation control?

Are the 3 A2A units operating and producing any heat output?

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Andris

(@andris)

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Topic starter 25/01/2022 12:02 am

We have 2 thermostats one upstairs one downstairs they controle the heatpump. But the weather compensation is on at the same time. Aprently when we connected a thermostat it turned on weather compensation automatically.

I set downstairs at 21c upstairs at 20c it comes on at 8 am. It will stay on till it reaches the set temp. Then off from that point till 8 am.( the temperature doesn't seem to fall lower than 20c.)

Yes I do use the A2A units to heat.

I set the A2A units to come on in the conservatory and only one 1 in the attic ( it is too well insulated, and 1 is enough even though it is 50m² . It was an absolute overkill now, I know). When the heating is on a small amount of refrigerant always goes up into the A2A units, which is normal on TDM. I realised that if I just turns the A2A unit in fan mode setting 1 the lowest it will heat enough to heat the conservatory with the underfloor and the attic. U can always feel it when it makes hot water; the air is really hot when it comes out from the unit.

What I learned is that when it goes to deforst it does air-conditioning in the room for 3 min🥶. But it is only on 3min. On the other hand if it was turned on heating mode it would automatically turn of the fan at defrost to avoid this.

I hope it all make sense.

Sent from my Galaxy

16kw Samsung TDM ASHP. 8.4kw PV, power optimizers 20×420watt panels 6kw SolarEdge inverter.

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