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Last seen: Jun 8, 2026
JamesPa Could I ask for your interpretation of the defrost algorithm for the heat pump? I am seeing a defrost at around an outside starting tempera...
I did manage to find the spec on the HP and that it can only modulate down to 2.1Kw. And very few other HP on the market get much lower. I have bou...
James Thank you for your help. I will work over the next week to try and produce the data requested. This is still new to me so still a step learn...
James I understand your point about turning the heating off and on or up and down and the resulting effect. Today the one room thermostat controll...
Re the chart that I posted. Could someone comment as to why the subsequent defrost cycles do not perform as per the the first at 3.30pm?
Just to add. As the system is not that common I have been unable to find anyone local who knows anything about the system or what I can do to fix it....
Re the chart. I should of added more info. The first part of the chart shows the performance during the day with one defrost occurring at 3:40pm....
The house only requires 14watts/m2. So at -2C I only require 2.7kwh. The HP is a 7kw machine. (forgive me if have some of the annotations incorrect)...
The Thermal Off is where the temperature into the heat exchanger is too high and it shuts down because the water is too warm. Others would call this ...
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