I cannot explain why either, but I work for a Lennox dealer and they will NOT put in anything but OEM in the Pulse because it does not last.
I have been back on some that other companies have installed aftermarket motors in a sort time prior. The HO thinks the tech did not do something correct and that is why the new motor died so soon.
We just say it is wired correctly, as long as it is, and order the OEM motor and cap. Usually never have an issue unless it is a bad motor out of the box.
The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
from an excerpt by Paul Jacob in Sun City, AZ
Ahh, the good old Lennox 27F01 motor, or whatever the number is these days.
Don't repeat the frustration of thousands of technicians before you, just buy the OEM motor.
The motor in Lennox 4/5 ton drive furnaces is a 3/4 hp, 1075 rpm motor.
I'd bet you several $100 bills that any of your normal supply house 3/4 hp 1075 rpm motors, or rescue type motors, will overheat and fail in place of the motor Lennox uses.
I've even had a real motor supply/repair shop try to match one up for me and fail.
I've seen mention that either AO Smith or Fasco makes a motor that will replace the OEM motor, but I've never found one for sale in a supply house.
The OEM motor has a thicker winding stack, higher amperage rating, and weighs significantly more than any of the commonly available 3/4 hp blower motors.
A motor shop even had me try a 1hp motor, didn't work out.
Look at the blower wheel in Lennox 4/5 ton drive furnaces from the 80's and 90's, not just the Pulse, but the 80MGF, G24, etc., it is bigger than you typically find in other furnaces.
If you look at the blower performance charts for those units, you will see that they have a significantly more powerful blower than most.
I've no doubt that there are aftermarket motors that will work, it's just a question of if anyone actually stocks them, which I've never had any luck with, even when dealing directly with a motor shop.
If more government is the answer, then it's a really stupid question.
The OEM motor has a thicker winding stack, higher amperage rating, and weighs significantly more than any of the commonly available 3/4 hp blower motors.
A motor shop even had me try a 1hp motor, didn't work out.
Look at the blower wheel in Lennox 4/5 ton drive furnaces from the 80's and 90's, not just the Pulse, but the 80MGF, G24, etc., it is bigger than you typically find in other furnaces.
If you look at the blower performance charts for those units, you will see that they have a significantly more powerful blower than most.
I've no doubt that there are aftermarket motors that will work, it's just a question of if anyone actually stocks them, which I've never had any luck with, even when dealing directly with a motor shop.
Thanks for telling us what you found, I like always like to know the why
Nothing is magic, it works or doesn't work for a reason.
The OEM motor has a thicker winding stack, higher amperage rating, and weighs significantly more than any of the commonly available 3/4 hp blower motors.
A motor shop even had me try a 1hp motor, didn't work out.
Look at the blower wheel in Lennox 4/5 ton drive furnaces from the 80's and 90's, not just the Pulse, but the 80MGF, G24, etc., it is bigger than you typically find in other furnaces.
If you look at the blower performance charts for those units, you will see that they have a significantly more powerful blower than most.
I've no doubt that there are aftermarket motors that will work, it's just a question of if anyone actually stocks them, which I've never had any luck with, even when dealing directly with a motor shop.
Interesting. I have replaced a lot of Lennox motors with non OEM with no problems, but don't remember how many of them were 3/4 HP. I would guess that only about 1% of the pulse furnaces I've worked on are the 100k with the 4/5 ton blower.
The Pulse's heat exchanger runs about twice as hot as any other furnace. Thus, a larger and beefier blower wheel to move more air to meet the temp rise. Most off the shelf after-market blower motors can not handle the blower wheels in those Pulses, as earlier stated.
This house is a mess bad electrically the furnace breaker has a bunch of lighting on it.Plus a few outlets the thing is only a 15amp.This furnace will use most of that by it self and all of it on start up.not to mention it`s a lot of knob and tube still
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Originally Posted by mark beiser
