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Old 01-28-2012, 07:26 PM   #1
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Heat pump fan motor replacement


I have a Rheem heat pump model # RPFB042JAS. There are 3 wires to connect to the fan motor, Orange brown & black coming from the unit. The fan Motor (Protech model # 51-23053-21) has 5 wires Orange, black, brown, red and purple.
This fan motor was previously replaced. I know the purple wired is not used.
I would like to know how to properly connect them!

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Old 01-28-2012, 07:41 PM   #2
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Heat pump fan motor replacement


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Originally Posted by Mark Tat View Post
I have a Rheem heat pump model # RPFB042JAS. There are 3 wires to connect to the fan motor, Orange brown & black coming from the unit. The fan Motor (Protech model # 51-23053-21) has 5 wires Orange, black, brown, red and purple.
This fan motor was previously replaced. I know the purple wired is not used.
I would like to know how to properly connect them!
Orange to Orange
Black to black
brown to brown

Tape off the red and purple

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Old 01-28-2012, 08:45 PM   #3
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Heat pump fan motor replacement


Thanks for your help. It looks to me like the red was also used? Is that possible? What happened was I was cleaning and de icing the unit when the top section (including the fan and motor slide off and the wire nuts popped off and the wires got disconnected.

Thank you so much for helping!
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Old 01-28-2012, 09:03 PM   #4
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Heat pump fan motor replacement


On the side of the motor there should be a wiring guide. From what I can tell the red is not used. Wire it in like I stated before

Did you get a new capacitor too?
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Old 01-28-2012, 10:51 PM   #5
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Heat pump fan motor replacement


No I do not believe that they changed the capacitor. Everything was working until I decided to clean it out and remove the ice build up. I should have just left it alone but here in Montreal Canada we have had a lot of freezing rain and snow and thought removing all that ice would make the unit more efficient!
There is a wiring diagram on the motor and you are correct it does look like the red is not used however the wires are bare and were definately connected somewhere. Oddly the black from the unit looks like it was clean cut and may not have been used., but more likely just got sheared off when the top slid and fell??? ( though I did not find that wire nut in that case.

I am afraid if I hook it up wrong and start it up I could blow the motor or short out something??
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Old 01-28-2012, 11:08 PM   #6
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Heat pump fan motor replacement


Yes you could short it out.

I can't find a wiring diagram of your condenser. If you are not comfortable to wire it in then I would advise you to call a pro.

I'm thinking that it is still

Orange to orange
Black to black
Brown to Brown

Tape off red and purple.

Other than that the only other option is

Orange to orange
Black to black
tape off red

and run the brown and purple to the capacitor

Brown to "C" terminal
Purple to "HERM" terminal

Otherwise brother call a pro
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Old 01-28-2012, 11:12 PM   #7
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Heat pump fan motor replacement


Thanks again so much for your time. I will look outside tomorrow for more clues! When I do get it working I'll let you know!
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Old 01-29-2012, 11:18 AM   #8
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Heat pump fan motor replacement


Hi Sorry to bother you again.

Is this hook up possible

Orange to orange
brown to brown
black on pump to red on fan motor
black on fan motor capped off
purple on fan motor capped off

or

Orange to orange
brown to brown
black on pump to red AND black on fan motor
purple on fan motor capped off

the wiring diagram shows Black (Hi)
and Red (Lo), what does this mean??
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Old 01-29-2012, 11:30 AM   #9
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Heat pump fan motor replacement


The red is low fan speed and the black is high fan speed.

I gave you the two options in refference to the wiring diagram off the motor.

If it were me I would

Orange to orange
Black to black
tape off red

and run the brown and purple to the capacitor

Brown to "C" terminal
Purple to "HERM" terminal

ANd either tape off or remove the other brown.

However at this point I would say for you to call a pro
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Old 01-29-2012, 11:32 AM   #10
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Heat pump fan motor replacement


That motor is designed to work on more then one size heat pump. Yours may have been running on low.
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Old 01-29-2012, 02:51 PM   #11
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Heat pump fan motor replacement


Once again thanks to both of you for your help. I got it working.

Wired as follows

Orange to orange
brown to brown
black on pump to red on fan motor
black on fan motor capped off
purple on fan motor capped off

I chose to use the red of the fan motor (Lo) as this is how it was done before, however I certainly think the black to black would also work and likely possibly be more efficient as the fan would turn faster. This is what Plumber 101 said from the beginning.

thanks again and anyone else reading this don't hesitate to take plumber 101's advise!
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Old 01-29-2012, 05:40 PM   #12
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Heat pump fan motor replacement


The black and ed motor wires go to the same winding. they just tap into it at different points. this controls its HP. using the black would run it on its higher HP. And if the fan blade doesn't provide enough load from moving air, the motor burns up in a short time.

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