HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

I am very confused. I have a Rheem RMB-030JBZ. Late last…

Customer Question
I am very confused....
I am very confused. I have a Rheem RMB-030JBZ. Late last summer the fan wouldn't start and I had a small independant contractor come out and look at it. He decided it was the capacitor. He didn't have the exact cap but had a universal cap. I said it was fine to use the universal and he did. I didn't notice any issues the rest of the season. It has be a very mild spring here in Colorado, but a few days ago we noticed the fan wasn't running again and it was buzzing. It seems that it was overheating. I called him out the next morning and of course the thing was running great but the motor was scalding to the touch. He couldn't source the parts locally and is extremely busy and I am extremely impatient.
I looked up the part numbers for the motor and sourced it at our local Grainger. Here's the rub the motor is a 5uf. But when I look up the part number for the capacitor based upon model it is a 3uf. The universal he installed is a 5uf.
My question is if I match the cap to the motor am I good?
Submitted: 2 years ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 8 minutes by:
6/26/2015
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,385
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified
Hello, match the run capacitor to the new motor run capacitor requirement, that will be on the new motors name plate. So far it sounds like the new motor requires a 3uf, if that is that case buy a 2uf run capacitor for it. You should have a clamp around type amp meter, to put on the common lead to the motor to check its run amps. if it runs at or slightly below the motors rated FLA, full load amps, then its the right capacitor. Home depot and lows have them at $50 or so, Harbor freight has them $25.----------We are on the honor system here. Please remember to rate my service before you leave today. It is how I earn a living, and does not increase your charges. If you need anything else, just let me know. You can continue asking follow-up questions within your agreed on limit at no additional charge.
Ask Your Own HVAC Question
Customer reply replied 2 years ago
The motor that I bought require a 5uf this what came up as a cross at grainger from the Rheem number, what is odd is that the capacitor number crosses to a 3uf. Regardless of all of that, my question is if I match the cap to the new motor will I be okay?
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Hello again, if you match the run capacitor to the motor is should be fine, I am at a total loss to explain why a 5uf capacitor cross matches to a 3 uf capacitor... there is a mistake somewhere.---------------We are on the honor system here. Please remember to rate my service before you leave today. It is how I earn a living, and does not increase your charges. If you need anything else, just let me know. You can continue asking follow-up questions within your agreed on limit at no additional cost.
Ask Your Own HVAC Question
Was this answer helpful?
Ask Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 9,385
9,385 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

9,385 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
This house is missing the circuit breaker for the disconnect
This house is missing the circuit breaker for the disconnect for the outside ac unit. What do I need to get to repair this?… read more
Phil
Phil
Mechanical Engineer
9,385 satisfied customers
I have a 4 wire thermostat and upgrading to a thermostat
I have a 4 wire thermostat and upgrading to a thermostat that requires a common wire. There is an additional wire but I don't think it's connected to the hvac system. I live in an apartment and the fu… read more
Daniel Plourde
Daniel Plourde
plumbing, hvac technichian
Vocational, Technical or Trade School
452 satisfied customers
My cental air is not working in my home. the unit outside is
my cental air is not working in my home. the unit outside is running , but no air is coming out of my vents … read more
Phil
Phil
Mechanical Engineer
9,385 satisfied customers
Have a csm code on my hayward prologic system what does that
have a csm code on my hayward prologic system what does that mean … read more
David Bowden
David Bowden
Owner
848 satisfied customers
I have a Lennox HS19-411u-79 air conditioner. It has started
I have a Lennox HS19-411u-79 air conditioner. It has started to drain water out of the overflow pipe along with the regular pipe that leads outside ( this part of the unit is enclosed) will drop for h… read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
High School
953 satisfied customers
Tried to turn on furnace after being off for a few days. air
tried to turn on furnace after being off for a few days. air conditioning was running and we had a cold spell. Blower kicks on, element heats up (78ohms tested) and flame ignites but shuts off after a… read more
Phil
Phil
Mechanical Engineer
9,385 satisfied customers
I have a HoneywellHPA-24X. I CHANGED THE FILTERS and now I
I have a HoneywellHPA-24X. I CHANGED THE FILTERS and now I cannot get it on again. … read more
Phil
Phil
Mechanical Engineer
9,385 satisfied customers
Building a new two floors, 2600 sq.ft. house with 2 AC units
Building a new two floors, 2600 sq.ft. house with 2 AC units (3 and 3.5 tons), one for each floor.The AC contractor installed only two returns, one for each of the two units, on the hallway at first a… read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,796 satisfied customers
I live in my house 19 yrs. In the front yard I have an area
I live in my house 19 yrs. In the front yard I have an area that dips down. It is not near the house but toward the font of the yard.. However, with the two hurricanes we had and now all this rain I h… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I replaced my thermostat with a programmable one of the same
I replaced my thermostat with a programmable one of the same brand, with same labeling on pins. I didn't have to move any wires. I turned off breaker for air handler and compressor before replaced. Ai… read more
Phil
Phil
Mechanical Engineer
9,385 satisfied customers
I recently viewed a potential home to purchase.
I recently viewed a potential home to purchase. “Coincidently”, the 900 sq ft basement was flooded by what the seller reports that as due to the float in his humidifier getting stuck and overflowing. … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I live on a ranch with a basement. The furnace and blower
I live on a ranch with a basement. The furnace and blower are in the basement, if I run the fan, is that air pulled from the basement?… read more
Phil
Phil
Mechanical Engineer
9,385 satisfied customers
My lower level stays cold almost feels like a cave while my
My lower level stays cold almost feels like a cave while my main and upper level are normal. Is there something I can do so that my lower level is not so cold? Would it be alright to close the vent? … read more
Phil
Phil
Mechanical Engineer
9,385 satisfied customers
I have an Amana condensing unit #RCB36B2A the start
Hi I have an Amana condensing unit #RCB36B2A the start capacitor failed its 19 yrs old and I cant read the numbers to replace it can you give me the start capacitor info to replace it? … read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
High School
953 satisfied customers
I live in Florida and a good HVAC is essential. We were
I live in Florida and a good HVAC is essential. We were quoted for a 3 ton 14 Seer new system. Our current one is made by Rheem but is from 1994 and we badly need a new one. The vast majority of our q… read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,796 satisfied customers
The heater sparks but doe s not light ,I have lite it with a
The heater sparks but doe s not light ,I have lite it with a match a few times … read more
canuck the pro
canuck the pro
253 satisfied customers
I have just installed a new copeland compressor ( model
I have just installed a new copeland compressor ( model zr48k53-pfv-7me)and it won' start. Looks like it is wired right. … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I just bought a house and I turned the air on and it is
I just bought a house and I turned the air on and it is coming out but doesn't seem to be circulating I went outside and the outside unit isn't even on or running … read more
David Bowden
David Bowden
Owner
848 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