We have a Carrier Infinity and it has the DC fan motor which runs at different
speeds for A/C and for just circulation. I have not experienced any noise from
it.
73
Dale, k9vuj
On 27, Oct 2010, at 11:41, Mel Crichton wrote:
> Looking to replace old furnace with new 95% efficient unit. (Air conditioning
> won't be changed out as it works fine and no RFI)
>
> I plan to stay away fom variable speed drive on the primary fan to avoid
> traditional RFI from VSD untits, but most all units have ECM (electronic
> control module) on the smaller combustion air blower. Some even have DC
> motors.
>
> Any experience (good or bad) with these high efficiency furnace units? (RFI
> in or out?) Looking at Carrier and brands made by Carrier (Kenmore, Bryant)
>
> Mel KJ9C
>
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