The IDS18 and IDS20 do the same, although Y1 and Y2 can be used for 2 speeds. Yes this is different from all the other inverters I support but look at the SEER, SEER2, EER, HSPF they rival or exceed all of the other products. The variable blower is comfortable but when you have a room or two in your home with poor airflow and you slow your blower down? Then it is less of a benefit.
Why the IDS15 use a single speed motor with a variable speed inverter? Dumb yes?
The IDS18 and IDS20 do the same, although Y1 and Y2 can be used for 2 speeds. Yes this is different from all the other inverters I support but look at the SEER, SEER2, EER, HSPF they rival or exceed all of the other products. The variable blower is comfortable but when you have a room or two in your home with poor airflow and you slow your blower down? Then it is less of a benefit.