On Sat, 20 Feb 2010 08:46:22 -0800 (PST), EvenStephen
The fan needs to move a certain amount of air per minute for the
furnace to be efficient and effective. If you drop below the design
limit by reducing the blower capacity the furnace may not operate
well, may not operate at all and/or be damaged. You probably should
seek the advice of a Rudd dealer.
On Sat, 20 Feb 2010 10:24:37 -0800 (PST), EvenStephen
That's the best thing to do. Someone else mentioned damage to the heat
exchanger. That's a very likely scenario if it can't transfer its
design BTU amount to the air flowing over it. It probably wouldn't be
immediate but it could warp and flex and subsequently crack. I've
inspected my fair share of furnaces with cracked heat exchangers
over the past 25 years and it's never good news to the owner.
The heat exchanger needs a certain amount of air moving over it to
keep it withing design temps, raise it above spec by reducing airflow
and life can be short with some new cheap aluminised exchangers, even
the best Lennox has or had them, mine does. Start by using a probe
thermometer, the one with a long metal probe, a meat thermometer and
get it just above the exchanger. I drilled a hole in the duct, but you
cant drill blindly usualy the AC coil is there. Then read the manual,
it could be to hot now as its something installers seem to be to lazy
to verify. So it should be checked anyway if you want the most life
out of it.
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