Question about Heating & Cooling

2 Answers

Wiring diagram for furnace

The transformer on a old whirlpool furnace went out after outside control wire shorted. looks like it is not the first time an additional transformer was hanging next to the original with a birds nest of wires. I replaced it with a universal unit that closely resembles the original. It is attached to a 4" box cover with the fan relay. the unit comes on but when it reaches temp. it shuts off but won't come back on. I need to know the proper fan wiring to correct the problem.
Thanks
Tom

Posted by on

  • 3 more comments 
  • tompiatt Jul 21, 2009

    the unit has no numbers on it and the wiring diagram is covered with paint.

    4 wires from heat exchanger

    4 wires from te blower

    3 wires from the relay

  • tompiatt Jul 21, 2009

    the unit has no numbers on it and the wiring diagram is covered with paint.
    4 wires from heat exchanger
    4 wires from the blower
    3 wires from the relay

    See less

  • tompiatt Jul 21, 2009

    The unit is an 1980's unit with no control board.

    it has

    fan/limit on the heat exchanger 4 wires (2 n.o.) (2 n.c.)

    fan 3 wires (hi) (lo) (common)

    relay 3 wires

    power 2 wires w/gnd

  • tompiatt Jul 21, 2009

    thanks for the link that is what I was looking for.

    the connection is the high limit on thefire box that I was unsure of.

    and the reason that it would not turn back on after I raised the temp and then lowered it to check that it turns back on is there is a 5 min lockout on the electronic thermostats.

  • tompiatt Jul 21, 2009

    the link to the site that sells the part I replaced explained the connection I was looking for.
    Thanks
    Tom

×

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 2,200 Answers

Hi

This PDF shows the common wiring for the original Whirlpool gas furnace using the Honewell System and is a very comprehensive walkthrough including complete installation and troubleshooting for wiring. http://www.whirlpoolcomfort.com/Upload/WFAU%20AND%20WFLU.pdf

As you say you replaced the unit with a very similar universal unit this will be of help in troubleshooting where the issue lies.


Hope this helps. Please remember to rate my answer. Many Thanks.

Posted on Jul 21, 2009

  • Radio Code Pro
    Radio Code Pro Jul 21, 2009

    Hi



    Without a model number or being on site to identify the circuits it is impossible to give anything other than generic directions for the fan wiring.



    There is a link here which I have found useful in the past in relation to common wiring for furnaces and it gives general color coding for each wires function but as I say other than that you will have a job to get any information. Again this link concentrates mostly on control boards which does not apply to your furnace. There may be some additional info there though from other manufacturers which may be of some use http://www.arnoldservice.com/control_boa...



    Have you thought of calling Whirlpool support? Its free on 800.253.1301. I know this is an old model and they may not be able to help but they might agree to email you an old furnace manual from their archive if you 'talk nice to them'.



    Given that you have no model information and this is a very old furnace I would suggest the only other option is to call in an electrician to trace and then match up the corresponding the circuits.



×

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 15,935 Answers

Please post the full model Number of the furnace.

Thanks!!

Posted on Jul 21, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Intertherm wiring diagram for model number MGHA-056ABFC-05


you have a 24 volt shorts check your thermostat wires to see if they are frayed or if they are touching anything. Check your outside wires also go to the thermostat.

Jul 12, 2014 | Intertherm Heating & Cooling

1 Answer

Well mc clain furnace


Probably a short in the control wiring. Does it last long enough to take current readings through the various components? If not, replace with a transformer equipped with an internal reset-able breaker. Identify the components it powers by following the lines and pull one 1 wire off each one. Reconnect them 1 at a time on till the problem happens. That will be the bad one.

Nov 08, 2013 | Heating & Cooling

1 Answer

My rv furnace want start up i changed ac units new don't have the relay box build in it how do i rewire the furnace ?


Shooting from the hip here, but look at both the new and old wiring diagrams. Chances are that the new unit has terminal leads that would connect to the old units' relay/control box and you simply need to install the old box on the new A/C by connecting to the correct terminals. beyond that, you can build your own relay setup if you understand wiring diagrams. If you don't know wiring, I'd recomend taking to an RV shop, as you can damage either the A/C or the furnace or both if wired incorrectly... Hope this helped!

Mar 26, 2013 | Heating & Cooling

1 Answer

Neither my AC or furnace will run I just replaced the thermostat but they still do not work. I there any other place the two are connected as they both quit at the same time.


Hi,
Either the transformer of the control board fuse in the furnace went...usually this is because of a short on the low voltage wiring...but could be a bad component... both can be very tough to track down... low primary voltage can also burn out either one of them...

heatman101

Sep 27, 2011 | Coleman Mach III Air Conditioner

1 Answer

Have a aprilair 550 for some time. Installed a new Lennox G61MP furnace and the technitions failed to reconnect the wiring that powers the humidifier. Need wiring schematic. Does humidifier transformer get...


Hello, yes the transformer will get a 120 volts from the Furnaces control board, there should be a terminal labeled HUM on the control board. You need to bring 2 wires one from HUM and one from a nuetral tap on the board to the line side of the transformer, this way every time the blower motor on the Furnace turns on the humidifier will aswell.

Aug 23, 2011 | Aprilaire 550 Humidifier

1 Answer

I have a 240v primary to 24 volt transformer that is burning up. i have narrowed it down to a problem on the 24 volt side but dont have a wiring diagram. this only happens in cooling mode. is there a...


If it is happening only when the cooling is being turned on, it will more than likely be between the indoor unit and the outdoor unit. There is small thermostat wiring that is wired between your indoor blower or furnace and the wire runs to the outdoor unit. A lot of times this small wiring gets chewed or freyed or a nail may be driven through it. This will cause a small short in the system that will burn up your transformer.

The only other problem could be the actual contactor this wiring goes to in the outdoor unit. Sometimes, the contactor coil may be shorted and can also cause the transformer to short out. The contactor is the small automatic switch in the outdoor unit, about 3" long and has all the wiring going to it including the high voltage wiring from the house.

Aug 17, 2011 | Carrier Heating & Cooling

1 Answer

I have a 20 year old furnace the transformer went took it off a year ago forgot the wiring , need a wiring diagram


The transformer is for the low voltage side of your furnace, you should be able to take the door off of the furnace and follow the wiring schematic on the inside of the door to wire it back correctly.

Sep 30, 2009 | Heating & Cooling

2 Answers

Blown Transformer heat pump


blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there
24v----------------
24v----------x----------
24v--------{3ampfuse}----------

now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
hope this will help you

Jul 26, 2009 | Ruud UBHC Air Conditioner

2 Answers

Problems with low voltage control wiring turning on cond. unit


Only 2 wires going outside.
Yellow from the thermostat and the common wire from the lv side of the transformer.

Apr 28, 2009 | Heating & Cooling

1 Answer

Whirlpool MH6151XHT-1 - No Power - Stumped


First change all the fuse and check whether it works or not, if it does not work than as per your finding the secondary transformer could be the issue, the secondary transformer tap down the voltage fro 230-240/110 to required control board voltage. the best thing if the unit is opened then the right problem can be found but as per your description either fuses are faulty or the secondary transformer.

Dec 12, 2007 | Whirlpool MH1150XMQ Microwave Oven

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

643 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

2557 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...