HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC

HVAC Guy only RE: RRPL issue - Need to figure out if

Customer Question
ForCustomeronly RE: RRPL issue -...
ForCustomeronly RE: RRPL issue - Need to figure out if compressor is loading to full capacity and fix the problem if it is not.
Submitted: 3 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 11 minutes by:
7/23/2017
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago
Brian HVAC Guy
Brian HVAC Guy, HVAC Technician
Category: HVAC
Satisfied Customers: 953
Experience: I have been an HVAC/R mechanic/technician for 30+ years.
Verified

Hello again! I remember our last conversation well. With the very high temperatures, is your unit struggling to keep up?

Ask Your Own HVAC Question
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

Regardless, what I'm going to need to determine that is the model number on the compressor part itself and a picture of the wiring to all compressor terminals. With those two things, I can tell you what's going on and possibly how to correct it.

Thanks,

Brian

Ask Your Own HVAC Question
Customer reply replied 3 months ago
Yeah, it is starting to struggle in the late afternoon a bit. I'll see if I can get that information tomorrow after church and lunch. Hopefully the house won't heat up too much while I'm pulling the fan off the top of the package unit to access the compressor. BTW, I would have reached out sooner but things are a bit tight right now.
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

No worries. I'm sure we'll get it sorted out. I'll be online tomorrow and I'll be on the alert for your next post. Have a good night and I'll talk to you tomorrow.

Brian

Ask Your Own HVAC Question
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

Ok David, your compressor is indeed a modulating two stage cooling model and the Copeland protector/staging module must be hooked up since it provides the 24 volt DC signal to load the compressor up to 100%. Your compressor is only operating 67% loaded with that module defeated. The module must be hooked back up and you must ensure that the Y1 and Y2 low voltage wires are jumped together if your thermostat and low voltage are wired up single stage cooling. If your thermostat and thermostat wires are wired up for two stage cooling then perhaps all that's needed is to restore power to the module by reconnecting the blue 24 volt ac common wire at the circuit board where it was disconnected. I would need pictures of your field thermostat cable connections to the factory low voltage wires at your unit to see if your system is wired for single or double stage and if the factory Y2 wire is hooked up or not.

Ask Your Own HVAC Question
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

Yeah, I still have all the pics you sent before but none of them show where the field run thermostat cable has its sheath stripped back and then showing where each individual wire is connected. Your picture of the thermostat inside tells me your thermostat is wired only for single stage operation since there is no connection at Y2 but outside, we need to know if the factory Y2 wire is hooked up in the same connection as the factory Y1 wire that will be wire nutted to the yellow field run thermostat wire.

Ask Your Own HVAC Question
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

And whoops, that's the brown 24 vac common wire from the module that's disconnected at the control board (not blue).

Ask Your Own HVAC Question
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

That's the one! Thanks! Let me study things for a bit and I'll be back with advice. I assume your goal is to get the unit loaded up to 100% cooling correct?

Ask Your Own HVAC Question
Customer reply replied 3 months ago
Loaded up and wired correctly. I'm a big fan of things done the right way to make things work the right way whenever possible.
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

Ok, having studied your pictures and the wiring diagram for your unit, they wired the low voltage so Y1 and Y2 would both be energized when the thermostat calls for cooling. This is evident in the low voltage field to factory connection of the field Yellow to the factory Yellow and Yellow/Blue wires. This effectively runs your unit as a single stage cooling machine at it's full 100% loaded output. However, whenever that OBD module had it's common wire disconnected, that reduced the loading of your compressor down to 67%. You need to reconnect that brown wire at the furnace control board to one of the 24 volt ac common terminals on the furnace control board. If there are no more available, you will have to remove one and connect it to the dual terminal of the disconnected brown wire that goes to the module then connect the brown back up to the board with the one you removed piggybacked on its terminal.

In other words, connect the disconnected brown wire we've been talking about and your compressor should load up to 100% unless there is an issue with the module itself. That could be why it's disconnected to begin with but you will only know that if you hook it back up and see!

Ask Your Own HVAC Question
Customer reply replied 3 months ago
How hard would it be to wire it so that it runs both stages like it is designed to do? As for the brown wire, I'll go dig it out. When we were working last time I took all of the unused wires off before you alerted me that something might be wrong with the comfort alert.
Customer reply replied 3 months ago
OK I've got the brown wire reconnected to the alert box on one end.
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

Pretty simple actually. As long as the cable between the thermostat and unit has all its wires completely intact, you just need to use one of the spares like, say, blue and hook it up to the factory yellow with blue stripe at the unit (after removing it from the Yellow/Yellow connection there) then connect the blue at the thermostat up to Y2 on the thermostat. I'm not sure if your particular thermostat needs to be told in its software setup that Y2 is active but you would need to look into that. That's it! Then when you powered the module back up with its disconnected brown common wire at the unit control board, all would be setup to run your system as two stage, all the way from the thermostat through the unit and to the compressor.

I'm pretty sure all the wires that need to be connected to the comfort alert module are still connected but you can send me a picture of it and I'll double check if you like.

Ask Your Own HVAC Question
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

Everything is hooked up at the module that's necessary. Use blue to connect to Y2 at the thermostat and hook the same blue wire to the yellow-blue wire you remove from the existing Yellow/Yellow/Yellow-Blue connection at the unit. Read your thermostat instructions to see if you need to change the thermostat setup options to enable Y2 or two stage cooling. As long as the module is ok, that should be all you need to do.

Ask Your Own HVAC Question
Customer reply replied 3 months ago
Okay. I'll pull book and look into that. Where do I connect my brown-wire friend?
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

As explained earlier: You need to reconnect that brown wire at the furnace control board to one of the 24 volt ac common terminals on the furnace control board. If there are no more available, you will have to remove one and connect it to the dual terminal of the disconnected brown wire that goes to the module then connect the brown back up to the board with the one you removed piggybacked on its terminal.

I guess what I didn't say is the brown wire needs to go on one of the C or 24V COM connectors on the unit control board. And if there isn't an open one, follow the directions above. There are so many wires there I can't see to show you exactly where to put it. Though, by looking at the same board on the internet, the three leftmost spade terminals in that gouping of spade terminals along the bottom are all C terminals (24 volt ac common). Any one of those terminals will work. Gang two of the wires with the double connector on the disconnected one if there's not an open spade terminal of those three.

Ask Your Own HVAC Question
Customer reply replied 3 months ago
Sorry about that! OK, now it is hooked up and the green power light is on for the comfort alert. Is there a way to verified that my compressor is now operating at 100%?
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

If you still have your buddies amp clamp meter, you can check to see if the compressor amperage goes up. There should be a several amp difference between low and high stage cooling. The wire you need to clamp around is the black wire in the group of black, red and purple, that go to the compressor. It should connect at the compressor contactor. Alternately, if you have a thermometer, you can check the output of the closest supply air register to the unit and there should be a several degree difference between low and high stage cooling (give a few minutes to stabilize before reading the temperature after stepping up to high stage cooling).

Ask Your Own HVAC Question
Customer reply replied 3 months ago
It was already cooling a couple of degrees better during the first cycle. I'll test it again later. From what I can tell from the manual, there may not be any settings to change. With that said, page 4 does have two possibilities under items 8 and 20. My guess is that item 8 would be closer than item 20 (fast cooling).http://www.bayareaservice.com/wp-content/uploads/2015/08/RHC-TST213UNMS-Installation-and-Operating-Instructions.pdfI really disappointed in folks that installed this unit and had been servicing it. I was a little leery of the on-line route but you've helped me a ton. I'm going to send some folks your way in the future!
HVAC Technician: Brian HVAC Guy, HVAC Technician replied 3 months ago

Sorry David, I didn't get alerted to your last post. I just happened to look back at our conversation and saw your new post.

Well, it sounds like you can tell a difference already. That's good news! I'm glad I noticed the issue last time, I'm sure it'll cool much better for you now! On the thermostat, as long as option 2 is still set to MS2 as its default, you should be good to go. You can play around with the options 8 and 20 to get the system to cool more to your liking as you see fit.

Yeah that's seems unfortunate both the installers and servicers dropped the ball. With the spare wires in your thermostat cable, I don't see why they didn't set it up for two stage control to begin with. Maybe the original thermostat wasn't a two stage model? I don't know. At least at one point the unit worked to 100% even if just as a single stage system.

It's really odd that someone would disconnect that module, especially when it controls 2nd stage cooling and doesn't even lock anything out if there's an issue. I don't see what their point could have been in disconnecting it.

Yeah, most of us hvac techs here are good guys and just do this to make some extra money. Like everywhere else, I suppose there's good and bad though. Point your folks to my profile and I'll be happy to help them!

Please don't forget to rate before leaving, bonuses always appreciated! Thanks for using Just Answer!

Best of luck and best regards David!

-Brian

Ask Your Own HVAC Question
Ask Brian HVAC Guy Your Own Question
Brian HVAC Guy
Brian HVAC Guy
Brian HVAC Guy, HVAC Technician
Category: HVAC
Satisfied Customers: 953
953 Satisfied Customers
Experience: I have been an HVAC/R mechanic/technician for 30+ years.

Brian HVAC Guy 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

6,730 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
Trying to get my furnace running. Only the blower keeps
Trying to get my furnace running. Only the blower keeps running with no heat. Had the igniter checked and it is ok … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I would like to install a new thermostat with my new hvac
Hi I would like to install a new thermostat with my new hvac and I need some documentation please … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
How can I tell I my York furnace control board is the cause
How can I tell I my York furnace control board is the cause of the furnace not completing the heat cycle. It shuts down and give me the pressure sensor/switch code but two tech's have been out and ver… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a e73 code on my new control. I'm just getting it
Hi I have a e73 code on my new control JA: I'll do all I can to help. How long have you been dealing with this? Customer: I'm just getting it installed JA: Do you plan on doing the work yourself? Cust… read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
My thermostat is a Honeywell T 8624 Chromoterm IV. Recently
My thermostat is a Honeywell T 8624 Chromoterm IV. Recently I noticed at night the heating cycle comes on momentarly and shutts off.the thermostat shows both setting and room temperature is 65 C. Duri… read more
Richard
Richard
District Technical Manager
Vocational, Technical or Trade Scho
1,416 satisfied customers
Ruud Silhouette blower fan runs without end. Burners will
Ruud Silhouette blower fan runs without end. Burners will fire, fan stays on forever. … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
This is the same guy with the Goodman furnace control board
Hi, this is the same guy with the Goodman furnace control board / transformer. My plumber said what caused the board to fail was a short in the blower motor from water from AC unit backing up into blo… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
My york diamond furnance/ac is leaking water in the
my york diamond furnance/ac is leaking water in the basement … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I need assistance changing my thermostat to my Trane UY-R9V
I need assistance changing my thermostat to my Trane UY-R9V furnace. … read more
Brian HVAC Guy
Brian HVAC Guy
HVAC Technician
953 satisfied customers
I have a Goodman GMNTE120-5 It has a furnace/control board
I have a Goodman GMNTE120-5 It has a furnace/control board with this part number B1809925two of the wires have come off two connectors, and the wires are the same color - trying to determine if it mat… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I recently replaced my furnace control board. The furnace is
I recently replaced my furnace control board. The furnace is a Lennox G40-OUH and the control board was a White Rodgers 50-A65-121-07. The only replacement was a White Rodgers 50A65-843 Universal Boar… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I am looking for instructions on how the wiring for an
Hello. I am looking for instructions on how the wiring for an outside condenser unit and condenser pump come together at the furance. … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have an amana furnace control board with an led flashing 3
I have an amana furnace control board with an led flashing 3 times … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I need help with my -Rodgers furnace control board 50e47-060
I need help with my White-Rodgers furnace control board 50e47-060 on a Trane furnace. It has a blinking red light. On the unit it says " steady red light- replace control, blinking red light-referred … read more
type2technician
type2technician
253 satisfied customers
I have a nordyne KG7TC-080D, with a furnace control board
I have a nordyne KG7TC-080D, with a furnace control board #624790/920916. this is a 2-stage upflow unit. Furnace ignites but goes out wihin seconds. flame sensor replaced, still the same issue. Has in… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I think that I may have a bad furnace control board. Trouble
Hello I think that I may have a bad furnace control board. Trouble shooting so far. Two different thermostats with the same behavior. Direct connection of the R&W&G wires make the furnace run continuo… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
My furnace control board light is not coming on. Yes, the
My furnace control board light is not coming on. JA: Did you check the furnace's filters? Customer: Yes, the furnace filter is new. JA: Do you plan on doing the work yourself? Customer: Yes. JA: Anyth… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I have no lights on my furnace control board. Nordyne G7 unit.
I have no lights on my furnace control board. Nordyne G7 unit. The previous control board was burnt up. I installed a new control board. Still no lights. However, there is 120 volts of power getting t… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 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