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Posted by Bubba on November 15, 2007, 7:36 am
>kool wrote:
>
>> > Change the size of the pulley wheel on your motor (make it a
>> > little larger) and get a new belt if necessary. This will
>> > increase the air
>>
>> Ya, overamp your motor and burn it out...good suggestion.
>
>Oh pulleeeze.
>
>Your average 1/4 or 1/3 hp blower motor with a 1.15 sf rating can
>easily handle a pulley change from 3" to 4" or 4" to 5".
>
>Something you bone-heads forget is that the furnace blower motor is
>helped by the fact that it's always being cooled by the return air, so
>it's thermally well protected.
>
>Jorge wrote:
>
>> Does anyone have an opinion about the best option.
>
>Jorge, increasing the pulley size by 1" is a perfectly good and
>perfectly reliable solution. A year ago I did the same thing on my
>furnace to increase airflow to the second story of my house.
>
>If you're really concerned about reducing the life of your motor, then
>oil the motor and the blower bearings when you change the pulley (I
>bet they haven't been oiled for years). The motors they put in the
>old furnaces like you and I have are not very efficient (no small
>electric motor is) but they're durable.
>
>> Can anyone comment on the urgency of the situation... how soon
>> do I need to fix this problem?
>> If the high limit switch burns out, then I am probably in
>> serious trouble. How likely is that to happen?
>
>No furnace should be hitting it's high limit. It's not a situation
>you want to happen. Normally it happens because your fan belt breaks,
>or your motor dies. And no, the high-limit switch doesn't "burn out"
>because of repeated use. It's usually part of the furnace thermostat
>that starts your blower anyways and stops your motor when the furnace
>has cooled down at the end of a heating cycle.
>
>You'd only be in serious trouble if hi-limit switch failed AND your
>fan stopped turning at the same time.
>
>And in spite of what other fools here have said, it's perfectly safe
>to turn down your burners a little to compensate for insufficient
>airflow. There is nothing magical or critical about the burners that
>require a precisely controlled and specified NG input pressure. They
>can operate over a wide range of reduced NG pressure and flow rates.
>
>Turning your burners down is safer than having your furnace run and
>always be hitting the high limit. That is a fact.
>
>Do you have a humidifier attached to the furnace? Humidifiers are
>ducted to take air from the supply duct, force it through a rotating
>drum or stationary sponge, and let it re-enter the furnace through the
>cold air return. You might have too much air flowing through the
>humidifier circuit. See if there's a gate or baffle in the humidifer
>circuit and close it down and see if that helps.
>
>Something else you can do if you're really in a bind is to open a hole
>(or maybe you already have a vent) directly on the return air plenum.
>If you have insufficient cold-air return then opening a hole will
>allow the fan to "suck" more air through the furnace, thereby making
>it less likely it will hit the hi-limit.
>
>Taking the cover off your humidifier (if you have one) would suffice.
"ding, ding, ding" We have a winner.
The newest Stormy has just spoken.
"notAhvacGuy"....you are absolutely clueless and NO, there is no way I
would tell you what you said is wrong. You arent worth the effort.
Bubba
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