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Posted by Art Todesco on January 25, 2007, 9:25 am
mkirsch1@rochester.rr.com wrote:
> Following up on my register temperature issue yesterday.
>
> A couple of people have suggested to look at blower speed. Mine is set
> to, "Don't stand near the cold air ducts, you'll get sucked in!" That
> is, the fan seems to be running at high speed when the furnace is
> running.
>
> I can find no fan speed control, either on the unit itself or at the
> thermostat. The only fan controls are at the thermostat and those
> consist of two selections, AUTO and ON.
>
> I realize that the fan controls may be in different places for
> different units, and I apologize for not being able to provide an exact
> model number, but what would be the telltale signs of a fan speed
> control? What would one look like? As I said, there is nothing either
> on or in the unit that is so obvious as to say "Fan Speed Lo Hi Off."
> There's a gas valve behind the access panel. That's it.
>
Many (most?, all?) require rewiring the
blower in the control area,
if it is indeed a multi-speed blower
motor. There is usually a common
lead and leads for each of the available
speeds, usually 3 or 4. Sometimes,
if there is heat and AC, it can be wired
for different speeds for each.
Obviously not a job for the typical
homeowner.
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