Samsung Gen 6 PWM pump Connections

Hardware Heatpump
1

Hi does anyone have pictures or notes on how to connect PWM pump to Gen 6 Samsung controller as have looked on various forums and they all seem to have made a few mess ups
I assumed they have power supply and then a voltage reference sugnal but on the samsung connecrion drawings i have direct from samsung tech they only show 230 volt 0.5 amp connections on B1 /B6
Regards

John

John

2

Have found the signal output terminals on the schematic on the back of the mim control box lid
Are there any settings to change in the controller to use the pwm pump?

3

midsummer wholesale’s diagram is a good one thats what I used.

4051/4052/4053 but it defaults to on and DT5 so start with that

4

Thanks for that Ian

Thats perfect, i would like to try it as i have a spare PWM PUMP so easy to give it a bash.
And mine was fitted with a fix speed pump

Although it seems to be fairly efficient but every little helps

Regards

John

5

if you take a look at my system 45 on HPM this is a large system with a PWM pump, you can see it uses pump modulation to maintain DT. (turn on the "show flow rate option)

glyn’s system 4 also has a PWM pump, smaller system, better flow temps and COP.

6

Thanks will do as mi e is also a 16kw

Regards

John

7

Hi Glyn

Where did you get the control cable from for the grundfos circulator
I have found a place but they want 16 quid for delivery

8

Hi, did you check that your Samsung’s inverter % reading does show values below 100% when at lower outputs? Mine doesn’t and I believe that it is something to do with which firmware the ASHP has. So even if I fitted a PWM pump it wouldn’t help.

9

Have you set the inverter pump settings to 'use 100% or 75% depending on if your pump is too big or not if you set it to the 75% you should see on the info that it’s output is 75%

John

10

Hi Mike also it will only lower its speed if the returning water temperature is to high ie the delta t is below 5.
When the delta t gets too far below 5 it will lower the flow to allow more heat to dissipate out of the emitters so then it will return cooler

This will only happen on my system when it’s running for a long time ad my system is quite big so takes a long time to get up to temp

11

Hi John, I haven’t altered FSV 4051 from its default setting of 100%. My understanding is that with the right firmware, when the delta t falls to say 3C, then under the indoor zone status information view, you should see inverter pump values below 100%. If that is the case, a PWM pump would get the correct signal to reduce the flow rate. However, if the inverter pump value is always 100% whatever the delta t, then fitting a PWM pump would not help as it would never get the correct signal. I read somewhere that thiis was a firmware issue. Some owners see varying inverter pump % values and some like me don’t.

I thought you ought to check before you fitted a PWM pump in case you had the same firmware as me.

12

Hi Mike

If you look at the flow rate when it’s at 100% and then change the setting to use 75% you should see a change in the flow rate

John

13

Hi John,
I’m afraid that I don’t quite follow you here. To control delta t, I would expect the inverter pump value to show 100% to start with and then gradually drop as delta t falls. If I had a PWM installed, then the signal to the pump would also change as delta t fell. However, if it always shows a value of 100%, then the signal won’t vary either.
Even if setting FSV 4051 to Inverter use + Output 70% changes the flow rate, it won’t do so in a variable way to control delta t will it? The ASHP won’t be on again until October, so difficult to check at present in any case.

14

Hi Mike

That was just to prove the pwm cable has control of the pump

You will only see a change in speed if delta t is to low

John

15

Thanks John,
I think we are at cross purposes here. I don’t have a PWM cable or a suitable pump either. Even with a delta t of 2.5C my inverter pump value stays at 100%, whereas other owners with a different firmware see lower inverter pump values with such a low delta t, indicating that they would be able to control delta t should they decide to fit a PWM pump. For me and others with the same firmware, it would be an expensive waste of time - my post was to alert you to this possibility should you have had the same firmware as me.

16

I have asked tech at Samsung to verify if this is the case

I will let you know the reply once I have it

The usual guy I speak to is on holiday so have emailed their centre

John

17

Hi Mike

How old is your ashp and what version is your firmware

Mine went in December 2020

Regards

John

18

Thanks John, I’m impressed that you have access to Samsung tech support. That’s very helpful.

19

Mike

They are usually very helpful

john

~WRD0001.jpg

20

My model is a Samsung 12 kW AE120RXYDEG ASHP and was installed in Feb 2022. I don’t know about the firmware version. It may be nothing to do with firmware of course - this was something I read about in one of the forums that seemed to explain that some owners didn’t see any change in inverter pump % value.