HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

I just installed a new motor

Customer Question
for my central air system...
I just installed a new motor for my central air system. I installed a new one in my other system a few days ago, and copied my wiring exactly as I was instructed to do in the last one, but this time the fan is not turning on when I start the system. Can you please look at this photo and help me with the wiring?
Submitted: 2 years ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 6 minutes by:
6/12/2015
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,885
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified
hello,
can you list wire color and terminals or post a pic?
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Wire colors on the new fan are: white, black, brown, brown/white, green, purple, yellow.
All wires are connected as you can see in the link to the photo below, and the brown/white wire was capped off.
Here is a link to my photo:
http://postimg.org/image/pd5toaozl/
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Ok first...confirm this is the condenser fan motor in the top of the ac unit?
And the compressor runs but not the fan?
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Yes, the fan motor hangs from the top of the unit, and the condensor turns on when I press the button in the middle of all the power wires, but the fan doesnt turn on.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Ok,
I see the old capacitor is still in place.
This capacitor can be bad on the fan side...and also it may not match the microfarads of the new motor. On the side of the motor..or the box...will be a cap rating needed. It will appear as (example) 7.5uf.
1 - if the capacitor is bad on the fan side it will not work
2- the cap should be changed whenever changing a motor to the cap value.
Try this....if you pressin contactor....and manually spin the fan blade...does it stop right away or try to start ?
Ask Your Own HVAC Question
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
And I see a wire is missing from cap to contactor....what is model of the outdoor ac?
Ask Your Own HVAC Question
Customer reply replied 2 years ago
The capacitor is not bad. I tested it in the other central AC that is exactly the same as this one 2 days ago and it worked perfectly.
I just tried pressing the contactor and manually spinning the fan, it doesnt stop right away, just keeps spinning but doesn't feel like there is power going to it
Customer reply replied 2 years ago
It's a Rheen RAKA 024JAZ. I am not sure which wire is missing as I have it wired exactly as the other one next to it and that one is running fine.
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Ok,
but does the microfarad rating on the old cap match the NEW motor...I am pulling schem...and what model motor then I will have all in front of me.
The cap rating is important vs motor used...
Ask Your Own HVAC Question
Customer reply replied 2 years ago
I am not sure which rating the capacitor has, but the new motor matches the specs from my old motor, exactly, and it's the same motor that is working in the other AC with the same capacitor (I replaced both motors).
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Please be patient as the wiring is not the same as the original diagram shows.
The diagram shows 4 wires to the capacitor. One on Herm (compressor purple)
one on fan (brown) and 2 on C...an orange wire to the contactor opposite black
and a orange from fan motor...
on your unit next to it...are there only 3 wires to cap?...as I do not see how it can complete line 2 circuit without going to contactor
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Yes there are 3 wires going to the capacitor... My other AC has the exact same wiring and it's running as it should. Here is a link to a photo of my AC that is wired and working, exact same AC model, motor and capacitor, but there is a white wire where there is a red wire in my other AC. http://postimg.org/image/fvecd5zpv/
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
well,
last thing I need...is motor model..I know by looks it appears the same.
But it is not matching my drawing...
I am going to copy what I have an post...just a moment as I have to use a file share site
Ask Your Own HVAC Question
Customer reply replied 2 years ago
This is the new motor I am using in both my AC's, here is a link. The guys at the supply house said the motor will work with my model and my capacitors. I believe this is a wiring issue. http://www.amazon.com/gp/product/B007VJKPLC?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Looking at your motor now..
here is wiring I show
https://www.mediafire.com/?oyoxcaa3whdhu78
Ask Your Own HVAC Question
Customer reply replied 2 years ago
This doesn't make sense to me ? That is why I asked for expert help
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
I have schematics that do not agree...so the very easiest thing is to do the following.
This motor is made to use its own capacitor..thus the 2 browns.
Go to supplier, get capacitor for the motor..it will have just 2 sets of prongs not 3.
Put brown on one side and brn/wh on the other and leave black and white where they are.
That is it...it is harder to wire these with a dual cap suach as yours. While there you may want to get a contactor or 2 as in the pic your contact points are shot...
so very basic...new cap for $10....use the 2 browns to cap...black and white to contactor and your done.
reagardless of schematic...that is how the new motor is designed.
Ask Your Own HVAC Question
Customer reply replied 2 years ago
I would like to wire these without having to replace the capacitor. I tested voltage on the capacitor and I am getting 24. The same capacitor is working in my other unit but I am missing something and I want to get it to work without replacing the capacitor like with my other AC.
Right now I have the brown/white wire taped off because another expert said I don't need it with this capacitor?
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
Well we are at an impasse because for some reason you do not want to change the capacitor.
BUT - EVERY TIME you change a motor or compressor you are to replace the capacitor. It is NOT voltage we measure. It is microfarads. And if do not replace the capacitor it voids warranty.
So whether you stay with 3 set terminal on the cap...or put in a 2 terminal for the fan..it should be done. And you still not have confirmed that the microfarad rating matches the new motor.
Once again...on a cap voltage is NOT our concern. And even if the microfarads were matching...you still (always) replace the capacitor with the motor. Its a good way to lose another motor by leaving old capacitor in.
I am going to opt out and give someone a chance to evaluate your concern...but if I were on site....I would change to a matching new capacitor...and new contactors as yours is in very poor condition at the contact points and can cause these failures also.
Please remeber that not changing your capacitors when replcing motor or compressor can lead to catastrophic failure of the expensive parts...and a capacitor is cheap.
I wish you well on your repair and will open to the others.
Ask Your Own HVAC Question
Customer reply replied 2 years ago
It's not that I don't want to change it, it's that I live in a rural area, and it's not easy for me to go drive 50 miles to change a tiny part. I have explained to you that another expert told me that I do not need another capacitor, the problem is that you weren't able to answer my question which was to help me wire it with the current capacitor. Instead you send me diagrams which had nothing to do with my question.
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6,938
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified
Welcome to 2 hours help.

Up to 48 hours trouble shooting and coaching on repairs $38 additional if you approve it at that time.
.
You can order the capacitor on line and have it mailed to you, those sell for $7 or so.
There is generally a sticker on the side of the new motor, any motor with a brown and brown/white wire connected to it requires a capacitor... the advice you got that says none is required is incorrect.
Take a look at Billy, recent response, he runs the service department of a large HVAC contractor for decades now. He is one of our highest rated, and most prolific consultants here.
The name plate on the motor should tell what micro farad rated capacitor is required.
If you can attach a picture of the wiring diagram sticker on the side of the motor I can show you how to wire it.... I also need a close up, well focused, well lit picture of the wiring diagram glued to inside of the blower service panel, taken straight on so that I can read the text on it when blown up. I mark those up with wiring instructions.
Use the 'attach files' link at the bottom left of your reply box to attach the picture.
We can go from there.
.
Ask Your Own HVAC Question
Customer reply replied 2 years ago
I was absolutely not questioning Billy 's qualifiations and I appreciate the help, but the issue I have explained several times to him is that I have a second unit, the same model, motor and capacitor and another tech was able to help explain to me how to wire that motor to the existing capacitor. All I trying to do is to do the same exact thing with my out of service AC as I did with the other one several days ago. I did not need a new capacitor, the existing one worked and I was able to have it wired to the new motor with no issues.
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Hello again,
That picture of the contactor needs to show Line and Line 2 coming in with a green ground, and terminal 1 and terminal 2 going out to BOTH the compressor and fan motor.. there are no terminal 1 and terminal 2 wires connected at all that run to the fan motor.... unless they are on a separate terminal block not show in the photo,
and... that capacitor shown (I can't tell for sure if its a capacitor but it is wired like a *dual* capacitor that runs both the compressor and the fan motor. not a single capacitor as the two brown wires would normally go to.
--------------
if the blower motor capacitor had only two cup terminals on it, run each of the two browns to separate cups on the capacitor.
Then check the motor amperage to be sure it does not draw more than the rated amperage, if it draws more than the rated amps when connected for high speed, the capacitor is the wrong micro farad rating, and will run the motor, but will cause it over heat and burn out, sooner or later, depending on how far out of range the old capacitor is.
Can you copy the wiring on the in-service unit? Is it the same brand and model number motor?
If not I need the photo's I mentioned earlier.
We can go from there.
.
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Hi Phil, Yes, it is a dual capacitor, that is what the other tech told me. Attached is a photo of the AC that is in service, it's wired exactly as the other tech told me to a few days ago, I tried copying the wiring with this other AC and it's not turning the fan on so I believe something is amiss but maybe you can see something in the photo that I am missing?
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Hello again,
http://screencast.com/t/MHkZQQj05cm
.
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Phil, I am not sure what the photo was trying to show me, but I am going to go get a new capacitor this morning. The fan reads: 5 MFD 370VAC so I am assuming that is the capacitor I need? The old capacitor that you said might be bad says: 30.0 3.0 370 VAC
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Hello again,
Please do not buy anything just yet, things can get progressively messier that way and burn off the time we have to get the situation resolved without going into over time.
I *need the photo of the wiring diagram to continue effectively... taken close up, well lit, well focused, and from straight on.
.
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Hi Phil,
I bought the new capacitor that matched the required specs according to the fan motor. The new capacitor is doing the same as the previous one.
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Hello again, there is most likely a wiring error, or a defect somewhere else in the system that I will not be able to coach you on without a photo of the wiring diagram.
I will opt out and we can see if any other of our experts here want to tackle this sans diagram, and with probable wiring errors etc.
Good luck with it.
.
Ask Your Own HVAC Question
Customer reply replied 2 years ago
Can a moderator please just close this question? I am asking the previous tech who helped me inside another thread. I can't believe these 2 techs sent me to buy a new capacitor without even diagnosing the issue first.
Ask Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6,938
6,938 Satisfied Customers
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial

Phil is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Phil

Phil

Mechanical Engineer

6,938 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

HVAC Technician

3,133 satisfied customers

35 years experience, HVAC

Matthew

Matthew

HVAC Technician

2,014 satisfied customers

14 years experience in the HVAC field of service, installation, Manual J & D calculations

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

953 satisfied customers

I have been an HVAC/R mechanic/technician for 30+ years.

Rick Ridley

Rick Ridley

UK Heating Engineer

871 satisfied customers

Retired But have had 30 years on the tools, Ex CORGI

Tom

Tom

HVAC Technician

770 satisfied customers

16+yrs HVAC/R service. Residential Commerical Industrial

< Previous | Next >

Related HVAC Questions
I replaced my defective Condenser fan. The 3 wiring hookup
I replaced my defective Condenser fan. The 3 wiring hookup on the defective is black to power, purple to defrost board and brown to dual capacitor. The replacement fan a MARS 10728 has four wires. Uns… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Can a condensate pump be used on a 100 gallon a o water
can a condensate pump be used on a 100 gallon a o smith water heater with a pvc horizontal vent system it is a 1/2" outlet at the bottom of heater … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
My heat pump condenser coil are freezing up during this
my heat pump condenser coil are freezing up during this latest cold spell, can I thall them by using my aux mode … read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,885 satisfied customers
My rhino e75CN/e110cn high efficiency condensing gas boiler
my rhino e75CN/e110cn high efficiency condensing gas boiler will not heat the house above 64 degrees. have set the thermostats to 78 and still will not het the house above 64. the LED display on the u… read more
Phil
Phil
Mechanical Engineer
6,938 satisfied customers
I have aTrane XE 1200 AC and as of yesterday the condenser
I have aTrane XE 1200 AC and as of yesterday the condenser fan and compressor won't shut off. … read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,885 satisfied customers
All my windows have condensation. Can I turn off the water
All my windows have condensation. Can I turn off the water to my G3203-75-2 to lower the humidity? … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Does it make sense that the outside condenser unit for the
Does it make sense that the outside condenser unit for the second story of our split HVAC system is 3.5 ton but the evaporator unit in the attic is 4 ton?… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
My high efficiency condensing furnace (Carrier) emits a
My high efficiency condensing furnace (Carrier) emits a terrible eye-stinging odor when heating. The furnace runs quiet and otherwise appears to be trouble free, however I see (and smell) a fresh (wet… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
Can I have a condensing furnace in a garage that's only
Can I have a condensing furnace in a garage that's only heated a couple days out of the week? I can install it inside the conditioned space but do I have to keep the garage heated all the time or can … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
Gianni tankless water heater error 25-condensed trap full. 1
Gianni tankless water heater error 25-condensed trap full … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I HAVE A 5 TON CONDENSE UNIT MODEL #M0H40D72C SERIAL
I HAVE A 5 TON CONDENSE UNIT MODEL #M0H40D72C SERIAL #702H02997 THAT THE COMPRESSOR WAS RECENTLY REPLACED BUT i STILL HAVE A ISSUE WITH IT IT CRANKS BUT IT STOPS AFTER 45 SECONDS NEED HELPWITH THIS IS… read more
R G
R G
44 satisfied customers
Water is leaking from my condensation humidier (i think).
HI. water is leaking from my condensation humidier (i think). When I touch under the box it is wet. What can I do myself … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I have a heat pump condense unit and it has made this loud
I have a heat pump condense unit and it has made this loud tat tat tat tat tat tat noise (when in heat mode) when it turns on or off. It goes from the condenser unit all the way to hearing in the blow… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I have a replacement condenser from Goodman, the original
i have a replacement condenser from Goodman, the original was a variable speed and they have since discontinued it and as a warranty replacement they sent me a different condenser and the wiring is to… read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
Condenser not running checked all breakers and thermostat
condenser not running checked all breakers and thermostat settings … read more
travis webb
travis webb
tech.
2,408 satisfied customers
Condensate pump for a-c in split system ran continuously and
Condensate pump for a-c in split system ran continuously and now Lennox furnace Model GS18Q314E-100-5 will not come on. … read more
Phil
Phil
Mechanical Engineer
6,938 satisfied customers
Moved into our new home and they added an AC condenser. In
Moved into our new home and they added an AC condenser. In the mechanical room there is a bundle of three wires that are not hooked up to the main board of the furnace. The bundle goes to the AC conde… read more
BillyHvac
BillyHvac
Journeyman HVAC Tech
22,885 satisfied customers
I'm gathering information on wall hung non-condensing
Hi. I'm gathering information on wall hung non-condensing boilers. I am the president of my Brooklyn co-op. We have 8 units in our building and each unit has it's own wall hung (Baxi) non condensing b… read more
Phil
Phil
Mechanical Engineer
6,938 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x