Manual Fan Control With Ducted Minisplit
I have a Fujitsu Halcyon ARU12RLFCD installed in the upstairs of our “Pretty Good House”. I have no complaints, it gets the job done and has plenty of capacity. I noticed something odd the other day and wondering if it is a bug or just part of the design.
I am unable to alter the fan speed while it is in Heat mode. When in Cool or Fan mode, I can change the fan speed with no problems, and if I crank the heat way up, the fan will ramp up/down its speed automatically, as expected. But if I wanted to select the fan speed while in Heat mode, nothing happens. I have tried leaving it on High for days and nothing happens.
I have two Fujitsu Halcyon ductless heat pumps downstairs, and they do allow you to set the fan speed while on heat. That makes me wonder if there is either something wrong or if it is just a feature of a ducted unit.
ETA: I must have something else going on. I put an energy monitor on the unit, and getting some strange readings. It is using 40 watts while off, which is consistent with the mini splits downstairs. But, when I turn it on, the energy drops to 12 watts. Surely that can’t be correct, but I’ve double-checked the monitor and everything seems to be working correctly.
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