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--- en:introduction [2025/01/09 13:37] – [Background] mechanically thingwizard
+++ en:introduction [2025/01/12 15:32] (current) – [Background] Article adjustment thingwizard
@@ Line 11: / Line 11: @@
 The design of these Mitsubishi MZN-LN25/35 etc. heatpumps is poor both in software and mechanically. **The software in the unit does not suit the Finnish climate - and most probably not any climate where the pump needs to be used for heating and the temperature goes below -5 degrees.** The pump heats mainly with short cycles (under 60 minutes) and tries to melt ice from outdoor unit's heat exhanger even when there is no ice. This is a waste of energy and makes heating inefficient.
-This is due to poor "fuzzy logic" algorithm which:
+This is due to the poor "fuzzy logic" algorithm which:
   * Instead of using temperature sensors it tries to predict de-frost need from previous cycles.
   * The mechanical side of the probems are related to the defrost temperature sensor. It is used to detect when the ice has melted from the outdoor heat exhanger. The defrost temperature sensor is installed poorly so it touches non-waterproof insulation material which gets wet from melting water/condensation and then freezes. **The frozen defrost sensor does not measure correct value needed for the "fuzzy logic".** Thus it starts to affect the device's "fuzzy logic" which starts to think that heating has been too long as outdoor heat exhanger is too icy and thus starts to decrease duration of heating... and this leads to a situation where the pump does not heat much but tries to melt the outdoor unit's heat exhanger often. Basically wasting energy by melting really often means it heats the outside air by taking heat from inside.