Hi, I have just got the monitoring system working on our Mitsubishi Ecodan air source heat pump, and am getting my head around all the lovely data. I was surprised to see that the circulation pump (which uses 150W) seems to run whenever the outside air temp falls below about 8 degC. This would be …

Hi I have this setup using a combination of Node Red and a industrial PLC - a Siemens S7-1200. I use Node red to push all the data such as Flow/Return/Outside temps along with heating mode I.e heating/hot water or antifreeze protection to the PLC via modbus TCPIP and then use the PLC to do PWM co…

I’ve had some of these issues during my 1st winter with an Ecodan. The issue of glycol & freezestat is covered above, but note that it also affects the output calculated and I don’t believe this can be compensated for in the FTC5 or DIP switches. I believe with 30% propylene glycol the actual ener…

[image] planetmarshall: Why wouldn’t you just turn it off? The lowest flow temperature you can set on the ecodan is 25 deg, which can still use a lot of power. Because then the controller can’t react to freezing conditions or any other situation. If the power is totally cut, you’d also miss f…

[image] mjr: Because then the controller can’t react to freezing conditions or any other situation. If the power is totally cut, you’d also miss firmware updates and more. Better to leave it on with a low room temperature target IMO. Ah, by “turning it off” I was referring to the MEL Cloud op…

[image] planetmarshall: you can still turn it back on via MEL Cloud Yep, I do that all the time. @mjr is right, this does rely on something actively noticing that it’s become cold. I use this smidgen of code to do that: MyForest/heatpump-act/blob/main/act/action_turn_on_power.py#L10…

@MyForest I’ve rather lost the plot of your question and this is just a quick reply while at work. As mentioned in [image] Improve efficiency: Turn the heat pump off Heatpump It turns out the opposite seems to be true for me! Probably because some of the radiator pipework …

[image] mjr: I’ve rather lost the plot of your question and this is just a quick reply while at work No problem. I was wondering what temperature you used to indicate “off” and you answered 17 °C. That makes sense. Unfortunately in my case it was below -4 °C outside so I would want the syst…

Hi, I have 14 Kwh, PUHZ-SHW140, EHSC-VM6D and thanks to @mjr script I am monitoring it using emoncms. I also noticed that the pump1 and pump2 run if the outside temperature is < 5. I don’t have glycol in my radiators but there is no freezing danger in my house. I wonder if it’s safe for me to turn f…

It’ll be circulated around the outdoor unit as well. I believe it’s necessary for the continuation of the guarantee that the antifreeze protection is enabled plus without glycol, you have the theoretical risk of damage to the HP.

Sorry for my ignorance, there is water circulating between indoor and outdoor? I thought is refrigerant

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Improving heat pump efficiency : circulation pump on Mitsubishi Ecodan

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