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--- en:start [2025/01/12 15:11] – [MitsuRunner Wiki] thingwizard
+++ en:start [2025/01/12 15:31] (current) – [What is MitsuRunner?] thingwizard
@@ Line 16: / Line 16: @@
   * Discussion on lampopumput.info (Finnish): https://lampopumput.info/foorumi/threads/msz-ln-sulatushuijaus.31223/
-====== What is MitsuRunner? ======
+===== What is MitsuRunner? =====
 MitsuRunner is a device that optimizes the heating cycles of Mitsubishi Electronics LN-series air source heat pumps. Defrosting is performed only when needed, rather than relying on Mitsubishi's clumsy, reactive "fuzzy logic," which may trigger defrosting every 40 minutes even if it’s unnecessary.
-[[fi:introduction|More about the benefits of MitsuRunner]]
+[[en:introduction|More about the benefits of MitsuRunner]]
+===== Operating Principle of MitsuRunner =====
+MitsuRunner tricks the air source heat pump's software by temporarily connecting a 33kΩ resistor in place of the pump’s defrost sensor (Defrost Thermistor R61). Normally, this sensor measures the outdoor unit coil temperature. The trick makes the software believe that the outdoor coil temperature is approximately +2 °C — at this temperature, the pump's logic never initiates a defrost cycle.
+MitsuRunner continuously evaluates the actual need for defrosting. It uses two temperature sensors to measure the temperature difference (delta) between the outdoor unit coil and the outside air. When the temperature difference becomes large enough, MitsuRunner disables the trick, and the pump performs a defrost cycle (if its defrost conditions are met). By operating this way — without unnecessary defrosts — the heat pump provides significantly better and longer-lasting heating performance.
+More on the topic:
+MitsuRunner GitHub: https://github.com/VeliML/MitsuRunner
+Original discussion on lampopumput.info: https://lampopumput.info/foorumi/threads/msz-ln-sulatushuijaus.31223/
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