Far2wired Posted March 31, 2022 Share Posted March 31, 2022 I have started setting up an emonTX to monitor ASHP usage (LG R32 7kWh). Seemed to be ok to start with but we also have a Solar iBoost which its usage is included (as I understand it the unit triggers the LG controller to use the immersion). Is there an alternative I should clamp to just get the ASHP usage minus iBoost? We have a mini consumer unit in the loft space as pictured below. Left to right - Heating - Connected to underfloor heating manifold. This reading tells me the pump is running for UFH. Immersion - I get a reading here when ASHP triggers its weekly cycle, but not when IBoost kicks in. Heat Pump - Get sensible ASHP usage figures but also includes when iBoost triggers the immersion, so inflates the usage. Main Switch / 20A Modular Contactor - No CT clamp I've confirmed the power to the iBoost control unit is from the Immersion MCB. Link to comment Share on other sites More sharing options...
Radian Posted March 31, 2022 Share Posted March 31, 2022 26 minutes ago, Far2wired said: Seemed to be ok to start with but we also have a Solar iBoost which its usage is included (as I understand it the unit triggers the LG controller to use the immersion). By immersion heater I assume you're talking about a DHW cylinder. Is the Solar iBoost really not powering this immersion? You say it doesn't, but it would seem odd if the Solar iBoost immersion control receiver unit had been wired to power the LG Electric Back up Heater. 1 Link to comment Share on other sites More sharing options...
Marvin Posted March 31, 2022 Share Posted March 31, 2022 10 minutes ago, Radian said: By immersion heater I assume you're talking about a DHW cylinder. Is the Solar iBoost really not powering this immersion? You say it doesn't, but it would seem odd if the Solar iBoost immersion control receiver unit had been wired to power the LG Electric Back up Heater. +1 Couldn't that cause the LG to overheat? Or is it going into a buffer tank immersion? Link to comment Share on other sites More sharing options...
ProDave Posted March 31, 2022 Share Posted March 31, 2022 I (and several others) concluded a while back that if you have treated mains water and an unvented HW tank, there is no need for a legionairs cycle, so turn that function off, and connect the PV diverter directly to the immersion heater on it's own circuit and not via the ASHP. That is what i have. Link to comment Share on other sites More sharing options...
ReedRichards Posted March 31, 2022 Share Posted March 31, 2022 (edited) I have an LG Therma V Heat Pump with an LG controller for the immersion heater for my hot water fixed to the side of the DHW cylinder. After my heat pump had been in operation for about 24 hours it went wrong and I discovered that the error state prevented me from using the immersion heater as a back-up to heat the hot water. That was unacceptable so I had it re-wired so there was a switch that could turn the immersion heater on and off wired in parallel with the LG control box. I have been using this for about 15 months no with no problems whatsoever. Just do as I did and wire the iBoost in parallel. Edited March 31, 2022 by ReedRichards Link to comment Share on other sites More sharing options...
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