[bradbeemerjr]

I recently installed a new condensing fan moter into a resedental Rheem model 13pja36a01 its a direct replacement from the manufacturer but it is a higher rpm it keeps going out in therm overload and i can't seem to tell why

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[timebuilder]

If you are in HVAC technician you have posted this in the wrong forum and you need to have the moderators move it to Tech to Tech residential.

Click on the black triangle in the lower left hand corner of your post and a window will open where you can make that request.

If you are not an HVAC technician.......then this is a non DIY site.

 

[bradbeemerjr]

i am new and thought that you had to make several posts before that could happen. Also i do not see a black triangle


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[pecmsg]

I recently installed a new condensing fan moter into a resedental Rheem model 13pja36a01 its a direct replacement from the manufacturer but it is a higher rpm it keeps going out in therm overload and i can't seem to tell why

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How can it be a direct replacement with a higher RPM?

 

[bradbeemerjr]

the factory rep said that this is the motor they are replacing these with it. They call it an upgrade kit according to the paper work i got with the motor.

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[martyinlincoln]

Call that factory rep back and ask him. Upgrade KIT would mean more than just a motor to me.

 

[bradbeemerjr]

Call that factory rep back and ask him. Upgrade KIT would mean more than just a motor to me.

i did they told me they don't give technical advice.

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[bradbeemerjr]

ok update i just moved the fan blades closer to the motor than the oem motor was and the amps habe dropped down from 2 to 1.5 its rated at 1.3 but it still goes oit in thermal cut off

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[Poodle Head Mikey]

How much higher RPM is it?

PHM
------

I recently installed a new condensing fan moter into a resedental Rheem model 13pja36a01 its a direct replacement from the manufacturer but it is a higher rpm it keeps going out in therm overload and i can't seem to tell why

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[bradbeemerjr]

How much higher RPM is it?

PHM
------

it is 225 more rpm an 850 to 1075.

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[Poodle Head Mikey]

The replacement motor is moving more air / doing more work. Work is measured in amps - with the result that you see. You either need to move less air or use more HP to move the same amount as now.

PHM
--------

it is 225 more rpm an 850 to 1075.

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[Poodle Head Mikey]

And do you know WHY this happened? WHY the amps dropped?

PHM
-------

ok update i just moved the fan blades closer to the motor than the oem motor was and the amps habe dropped down from 2 to 1.5 its rated at 1.3 but it still goes oit in thermal cut off

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[bradbeemerjr]

noe i do its moving too much air out of the box when in the old fans position making the motor work harder i need a different fan blade. perhaps a different pitch?

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[Poodle Head Mikey]

The fan usually works best either centered in the venturi cone of the surrounding or at least in the factory position. When you moved it out of that sweet-spot the air being moved was less. So the motor was doing less work and required fewer amps to do it.

What you have done cannot work. The manufacturer lied to you. What you want is the original designed air flow volume.

If you increase the HP the greater air flow will improve the system performance but make more noise doing it. <g>

How did the customer react to all this trouble with a new motor?

PHM
---------

noe i do its moving too much air out of the box when in the old fans position making the motor work harder i need a different fan blade. perhaps a different pitch?

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[pecmsg]

theres a # on the bottom of the upgrade kit paper work. Can you post it or take a picture?

 

[bradbeemerjr]

ok so i have found an exact replacement from another wholesaler thanks for all the help

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[Mr Bill]

it is 225 more rpm an 850 to 1075.

As Taryl Fixes All would say "and there's your dinner.....:grin2:

 

[samgevas]

"Upgraded" the 850rpm motor to a 1075 on the same fan blade.

Seems legit...


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[vstech]

DIY DIY DIY...

 

[vstech]

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