Quote:
Originally Posted by basjoos
Not sure how my new Mitsubishi mini-split decides when to initiate a defrost cycle, but its not on a fixed schedule.
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Mitsubishi uses an outdoor temperature thermistor and outdoor coil line temp thermistor(10kohm - type) Outdoor temp sensor should be at the top left corner of the outdoor unit's coil, facing your house.
Basically, the line temp sensor will say that it's not running efficiently enough (not enough temp change from coil inlet to outlet) and send it into defrost mode. The outdoor air temp sensor helps the system calculate outdoor fan and compressor speed for max efficiency at a given outdoor temp.
Thanks,
Victor