Question about Heating & Cooling

1 Answer

I have a new system. Electric heat, straight ac. Can't get 24 v to contractor. Two wire from ac is red to common in furnace and yellow to yellow on Tstat. Rest of wiring is red for Tstat to red in furnace. Green from Tstat to green in furnace and white from Tstat to white and brown at furnace.

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 880 Answers

24 volts comes from the transformer to contactor

Posted on May 18, 2014

Ad

6 Suggested Answers

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.
the service is completely free 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

Ad
22yooper
  • 828 Answers

SOURCE: heat strip install

What color wire is connected to the "Y" terminal on the thermostat.
If the unit you are connecting is a heat pump A/C unit the orange wire is for the heating mode. Normally the "Y" terminal on the thermostat. "R" terminal on the thermostat is the power to the thermostat, "W" terminal is for heating, "Y" is for cooling, and "G" terminal is for fan operation. At the condensing unit for cooling the brown and yellow wires would normally be for the cooling.

Posted on May 22, 2008

peyton32034
  • 410 Answers

SOURCE: thermostat wiring goodman model aruf032-ooa-1b

is this a heat pump or straight cool with heat strips?

Posted on Mar 16, 2009

hiltonjug
  • 612 Answers

SOURCE: I have a hunter programmable thermostat model

Make sure you do not have a jumper between the red and the white. Also make sure the wire is not hanging out from behind the screws. If the heat stayes on no matter what you do. The red wire has to be touching the white somewhere.
The red is your 24v supply to the thermostat
The white is what sends the 24v to the heat side of unit.
Just a thought. If the thermostat has a O/B pin or switch on the back. Make sure it's on O. It should only be ob B if it's a Trane, American Standard or Payne.

Posted on Oct 16, 2009

heatman101
  • 43501 Answers

SOURCE: Trying to wire RUUD gas furnace. connection block

No problem have done this many times. R from the t-stat goes to R on the indoor unit. G goes to G Y goes to Y and C goes to C if you have a C or the t-stat the you are using. If there is no C there dont worry about it. It only need to be hookup if the t-stat uses power from the unit to run. Many t-stats today use battery power and do not need the C wire hooked up. Now R and C from the outdoor unit. R goes to the Y on the indoor unit and C goes to C on the indoor unit. That means that you may have two wires under the Y terminal and sometimes under the C terminal on the indoor unit. If on the outdoor unit there is no designation of R and C dont worry, just hook one wire to each of the two wires there for your low voltage connection. It does not matter which one goes to which unless they are marked then it may matter.
This should get you up and running and see it really isn't that hard!! :-)

Posted on Nov 14, 2009

Testimonial: "Thank you very much! I have been searching the inernet for hours to find a manual or diagram. Got a response within 15 minutes of posting. "

shastalaker7
  • 1515 Answers

SOURCE: replaced fan motor for outdoor ac unit old fan has

Hi, the 2 - brown wires are for there own run capacitor they should have sold you. One of the browns will have a white stripe. The new cap has only 2- terminals and you put a brown on each side. The black and yellow wires are both hot which 1- will go to 120 volts on the load or out side of the contactor, and the same with yellow, 120 volts. This gives you 220 volts to run the motor. Look on the new motor and you will have a diagram or on a paper that comes in the box. The old motor used the dual cap to run the compressor to. The green is just a ground wire. Screw it to any metal part or screw. You should be able to put the black and yellow hot wires where the old black, red, or blue were as long as they are 120 volts which I am sure they are. Get a cheap tester when you go get the cap for the new motor, and check the old blk, red, and blue terminals to ground and you should have 120 volts on at least 2 of them. Put the new yellow to 1 and black to another, browns to the new cap and your off and running. Keep me posted. I do this everyday. Please be kind when rating me, thank you.
Shastalaker7
A/C, Heating Contractor

Posted on Jul 09, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Wires don't match the new thermostat posts. The wires from the furnace are Red,Blue black and white The posts in new thermostat are B O G Y not used R and Rc Can't figure which to put


The wire colors are for the following functions ......red - 24 volts white - heat yellow - AC green/blue - blower (fan) red is connected to the R with a jumper between R and Rc What type of furnace/heat do you have ???? Electric. oil, gas .Forced hot air, baseboard, steam, heat pump, or ?????? Different systems use different connections and need a specific thermostat for that application !!!

Dec 13, 2014 | Heating & Cooling

1 Answer

Which thermostat to use 4-wire Goodman gas furnace


blue is common. never let that wire touch any other color or you will short the transformer. Use a thermostat for single stage gas heat. R=Red W=White Y=Yellow which should go to the outdoor ac contactor and C=Blue which should also go to the outdoor ac contactor. If in doubt call a qualified Heating contractor to help you install. It can get quite expensive letting the smoke out of your parts.

Aug 21, 2014 | Heating & Cooling

1 Answer

I hooked up a coleman electric furnace to a janitrol condenser heat pump . The t-stat wires on electric furnace are red white green and yellow. I added a blue for common off of transformer for digital...


Hi, first of all you need to get a hand full of 5 amp auto type fuses and install one on the hot leg of the 24 volt secondary side of the transformer. Just use 2 female crimp on connectors and put the fuse in the middle of the hot wire. Saves $$$$ on replacing transformers when you have a dead short on the low or high voltage side of any transformer, just a trick of the trade, food for thought. Fuses are much cheaper. On your electric unit, you may not need the common on this to operate the digital stat if it has batteries. This may be your dead short. On the Janitrol condenser, the red is your 24v as you no. They are using blue in place of yellow for cooling. Red is hot, W is heat, G for fan, and blue is cooling on this Janitrol. Keep in mind you are connecting to a heat-pump also, so make sure the wiring is correct. Are you installing this for secondary Heat?? More then likely, the blue common you have added is the dead short as the janitrol uses the blue for a cooling relay in place of yellow. Anyway, use the 5 amp fuse, trick of the trade to save on the transformers. Please keep me posted, as I know know you have this under control.
Shastalaker7
A/C, Heating, & Refrigeration Contractor. Good Luck!

Feb 09, 2011 | Coleman Heating & Cooling

1 Answer

Wiring diagram for Thermoking V700MAX


Red or R is the "Hot leg" of the Transformers 24volt supply,
Common or C is the "Neutral leg" of the Transformers 24 volt supply;
and the side of power to which ALL the 24 volt control circuits
terminate to complete the circuit, example; Heat=W, Cool=Y, Fan=G.
Upon a call for heat a switch closes betwen the Red and White Thermostat terminals.
The stat sends the 24 volts to White or W for the heat circuit on W on the
furnaces LVTB low voltage terminal board.
Yellow or Y goes from Thermostat to furnace Y on LVTB, which is simply
a connecting point on its way to the AC units 24v contactor coil located outdoors.
It actually isnt even attached to the furnace many times as it serves no purpose there and simply
continues to the AC unit with the copper lineset that the AC unit feeds.
The remaing 24 volt Thermostat wire goes back to common on transformer to complete the Yellow
24 volt control circuit.
Green or G exits the Thermostat and connects to G on LVTB for the fan relays 24volt coil
and returns to Common to complete the Green 24 volt control circuit.
O is for a Heat pump reversing valves 24 volt solenoid, and return to Common as all 24v circuits must to terminate or complete the circuit.
Some parasitic type Termostats need the 24v power to run, some are battery, some are both.

Nov 01, 2010 | Heating & Cooling

1 Answer

With the Dometic 3106995.032 thermostat fan switch set to "auto" the fan in the overhead A/C unit comes on (when system is set to "Furnace") as the temperature control is raised but the furnace doen't kick...


Hi, the wiring terminations are near consistent with a 24 volt ac furnace and I will tell you how a 24 volt stat is terminated. RC= 24 volts jumped to RH for red wire only. This would be for a central system with air and heat. W=white for heat, G= Green for Fan, and Y = yellow for cooling. I do believe it is wired correctly for your application. Please verify your units model and serial number and give me a clue as to what is taking place, and did you change the thermostat or make a part change?
Sincerely,
Shastalaker7
A/C, & Heating Contractor.

Oct 19, 2010 | Heating & Cooling

1 Answer

To which (two ) terminals on the furnace PC board


Hi, at the PC board, you will connect the red to the R terminal, and yellow if that's the color they used to the Y terminal which may have a wire from the stat on it already. This will close the contacts on the contactor on a call from the thermostat for cooling. Please be kind when rating me as I know you will. Thank you.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor
PS, if you run the wires and connect to R and C for common, the outdoor condenser will run all of the time on its own. It will have 24 volts straight to it constantly.

Jul 28, 2010 | Goodman GMS90703BXA Heater

1 Answer

I installed a Honeywell TH5220d 1029 thermostat on a American Standard AC/Heat pump and the install and setup went fine. It cooles for about and hour and quit. I found the 5 amp fuse at the furnace...


Red wire to R on thermostat red on furnace and red on heat pump Same with white except w1 on thermostat. Blue to common on thermostat common of furnace (probably brown but will be marked) and blue to common on heat pump. yellow to Y on thermostat and straight to heat pump. Orange to O on thermostat and straight to heat pump. If wired correctly with no shorts fuse problem should be solved. commonly people leave enough wire exposed inside the t-stat for wires to short together. This will blow the fuse. Hope this helps. I understand the frustration.

Jun 27, 2010 | Heating & Cooling

1 Answer

Tempstar furnace when the thermostat is fan on the fan from the air compressor turns on not the air circulation fan in the bottom of the furnace


Y or yellow and G or green are connected in the "auto" setting, as G is fan and Y is cool, the Y and G wires are somehow, energizing the Y wire that goes to the AC unit to run cool, take thermostat off exposing the thermostats sub base Y and G will be there along with R, red, 24volt ("hot leg" of 24 v power) W white= heat, and C common, 24 volt ("neutral leg" or "common" leg of 24 power) common is where all the various 24 volt circuits (cool, heat, fan,) terminate or return to complete the circuit, just as a AA battery nas a positive and negative side of power, so does the furnace and all electrical circuits, its common as all circuits terminate there , its the opposite side of power fro whish all circuits begin, red is the :hot leg" and enters on RED red to WHITE=HEAT

RED to YELLOW=COOL
RED to GREEN= FAN

auto =Y & G connected
on= R & G connected

if you jump red to green, which is fan on, no connection should exist to yellow in on ! only auto!

May 27, 2010 | Heating & Cooling

1 Answer

I need help with my central heat and air unit, it has a heat pump. the model number is GQ3RA-036K. I am changing the theromstat out and the wires are connected to it. there are eight wire colors that are...


Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} Thermostat wire color codes explained.
Please note. Not all installers use the proper color codes when they install or replace equipment. It may be necessary go go to the furnace or outdoor unit to verify what wires are for what purpose. Also be sure there are no splices in the wire that could change the wire colors between components.
  • R (red) or Rh (Red heat) 24 volts from equipment.
  • Rc (Red cooling) 24 volts from transformer in cooling equipment.
Note: If only furnace has a transformer and cooling equipment does not jumper Rc and Rh.
  • W (White) sends 24 volts to furnace control to start the heating cycle.
  • W2 (no standardized wire color, usually whatever wire color is available) controls second stage heat.
Note: W2 is most often used for heat pumps to control what is called emegency heat or Auxillary heat, and most often will use the white wire.
  • Y (yellow) often (blue) is used, controls cooling unit (outdoor condensing unit) also is used for heat pump heat.
  • Y2 (no standardized wire color, usually whatever wire color is available) controls second stage cooling.
  • G (Green) controls the fan "on" operation of the furnace/air handler. Also often is used to start the blower for many electric furnaces.
  • C (common) most often brown but can also be black or other color available to installer.
  • O (orange) Energizes heat pump reversing valve for cooling (Trane and most other brands).
  • B (Blue) Energizes heat pump reversing valve for heating (Rheem, Ruud and Weatherking).

May 07, 2009 | Heating & Cooling

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

Related Topics:

46 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

paulcarew

Level 3 Expert

2517 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...