Those Samsung ASHP owners with access to the new FSVs like #1061 etc. (e.g. version 01 PCBs) may not appreciate that the default setting for FSV#6031 is "Yes” (or “on”), and that the description/explanation in the manual is not very precise (surprise…).
Following some unexpected/unfamiliar circuit operation after replacing my PCB with a v01, I saw - in 3 test runs out of 3 - that the controller was stopping the compressor if the required inverter frequency fell below 30Hz (previously, my HP - an 8kW HTQ - had operated happily down to 20Hz).
The Good Book states that this is an energy saving measure - and maybe it is (I haven’t run the economics yet) - but I worry that the additional stop/starts that occur as a result may be imposing extra stress on the compressor circuit (incl. inverter/motor/seals and other moving parts like EEVs/SOVs). I also had some strange DHW heating problems - like terminating tank heating before setpoint was reached - until I reset #6031 to “No” yesterday. Now everything (CH and DHW) is running as it was with the old PCB.
It may be worth annotating your manual with the above observations, and my thanks to UK Helpdesk for drawing my attention to this “new” FSV .
This is interesting. I can confirm that #6031 was indeed available in simple settings and was set to 1 (assume on) I set it to 0 anyway just another thing out of the way whilst we investigate further.
This is the explanation I could find for it. Seems related only to Thermo on of so maybe it has an impact on what we are seeing. If its off it can’t interfere!
FSV #6031 on a Samsung EHS Mono heat pump refers to a Field Setting Value (service setting) related to the Heating Optional Thermo On/Off Function. This function is designed to increase efficiency by managing when the heat pump activates, particularly in response to heating demand.
Key details regarding FSV #6031 and related Samsung EHS settings:
Purpose: It is intended to optimize the heat pump’s operation to improve overall system efficiency.
Context: It is part of the advanced installer settings (Field Setting Values) available on the wired remote controller (e.g., MWR-WW10N).
Related Settings: In community discussions regarding Samsung heat pump optimization, users often explore these settings to manage DHW (Domestic Hot Water) cycles and compressor modulation to prevent excessive power usage.
It’s quite some time since the OP, but for those who find this later - from what I’ve measured, below ±30Hz, the COP drops down as a rock (samsung r290). It’s not unusual to get below 2. Pushing for longest uninterrupted runs is not always the best strategy. You should try for long run (not run at unnecessary high frequency, but not push it too low either). That’s why I have used HA integration to basically do something similar to what the new FSV does, stop when below a limit for more than 5 minutes. When heat demand is low, which is exactly when compressor frequency would drop, the system can survive with a little bit of hysteresis and not start that often. It also depends on your installation as in my case even with stopping, I always get less than 1 start per hour on average. You have to observe your system and decide the best approach for you.
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