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To what terminals do the two wires coming from the a/c unit connect to on the furnance?i have r w g y c on the furnance board. its a carrier tech 2000 a/c and a rheem criterion 2 furnance

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The 2 wires that come from the outside unit will connect to the Y(Cooling) and the C(Common) terminals on the board. It doesn't matter which wire goes to either one, they both work either way. Have a good one!

Posted on Sep 01, 2010

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Code 24 on carrier weathermaker 8000ts


Turn power off to unit. Open air handler and take a picture of the low voltage (tstat) wires and where they are landed. Remove all thermostat wires from control board. Then replace the 5 amp fuse that is likely on the board. Fuse likely looks like one for a car (blade style). Put a jumper (small piece of wire) from the R terminal to the G terminal and turn power back on to unit. This should bring on the indoor blower. Let me know how that goes!!

May 12, 2017 | Heating & Cooling

1 Answer

Aprilaire550


Did you just install this unit, or has it been working for a while and just stopped?
1. If you just installed it, the solenoid wires (yellow) must be hooked up to switch in when you have a call for heat.
a) use a current sense relay OR
b) connect 120V & neutral to "HUM" terminal and neutral on heater control board.
2. If it has worked before, maybe the saddle valve is plugged. Turn the "T" handle all the way clockwise, then all the way out CCW. You can hear the water start flowing. Loosen compression fitting at solenoid valve to make sure water is getting there.
3) Also, you must supply 24V to the circuit to open the solenoid valve. Check your wiring. It depends on the model what way to wire it and I cannot go into that here.
4) Testing: Turn off humidistat control. Turn on heat, wait for blower to come on. Turn humidistat control to test posn. Solenoid valve should click. This will put water into top of Aprilaire tray, after few minutes it will dribble out bottom clear vynl tube to the
drain.

Jan 29, 2008 | Aprilaire 550 Humidifier

1 Answer

I have a HoneywelI Enviracare Elite whole house humidifier. I have no power to the thermostat. The wire goes into the furnace and is attached to a control board. The furnace is working. Humidifer is n


Most of the humidifiers are run by 24 volts AC. disconnect the power wire to stat on circuit board and check there with meter and connect to low voltage ground for 24 volts, I'm assuming the two wires that power the humidistat are red and white.typically red is used for power. most likely you have power if the red for the stat is connected to the W on the board and the heat works, but the humidifier only works while heat is on.the next thing in line is the humidistat , it's a switch so if there is only two wires going to it take them off the stat and connect together, if furnace is on heat and running and stat wires are connected it will send power to water solenoid, if its not working yet the problem lies in the water solenoid if you have 24 volts at the two wires at solenoid.check while disconnected, do not connect those two wires together or a 3 amp fuse will blow on the furnace board. if you have 24 volts there then the valve may be bad or the valve may be stuck or clogged, loosen water supply line to make sure water is getting to valve. I spent many years working in the HVAC industry.

Dec 31, 2011 | Honeywell Humidifiers

1 Answer

How do u wire athermostat to the furnance and ac unit on model e3eb-015h nordyne


You need to get low voltage wire known as 5 wire. run wires thru wall to stat and furnace Red wire goes to R terminal white to W terminal Green to G terminal Yellow to Y terminal on both the stat and furnace circuit board. Now you need a wire called 2 wire low voltage wire run that from furnace circuit board to outside A/C. At furnace hook red wire to Y terminal and white to C terminal doesnt matter which ones you hook up at outside unit. Do it just like i told you this will work properly.
If this helps please rate me.

May 20, 2011 | Heating & Cooling

1 Answer

Carrier 38CKC048 unit outside does not turned off when the furnance fan is turned off by the thermostat, I believe its the contact switch that is sticking what part do I need to replace, and can I do it or...


do you own a multi meter? do you know how to use one? if not call some one.
does the unit keep running outside if you turn off the furnace power switch. if it keeps running it the contactor in the condensing unit. if it shuts off it is your t-stat.

May 28, 2010 | Carrier 38CKC048 Air Conditioner

1 Answer

I have a RUUD Furnance with a piolet light. There


If you have a pilot, then this is an older furnace. Most of them use a 2 wire thermostat. Allot of the new digital, programmable thermostats require a 3rd wire - a common to the thermostat. Allot of old furnaces do not have a common terminal on the furnace board. It can be done, but takes a good technician. The way around this is to use a digital, programmable thermostat that will operate on straight battery. It will be stated on the thermostat package, saying it will operate with a common wire from the furnace or with only the use of the batteries.
Then make sure that you hook up the 2 wires to the "R" terminal and one wire to the "W" terminal, it doesn't matter which thermostat wire goes to which terminal.
Note: If you have a air conditioner installed, it will be a different story.
Sincerely,
Good Luck,
Paul Gibson

Mar 31, 2010 | Heating & Cooling

1 Answer

Thermostat will not turn on AC unit or the fan in the unit. Heating-Co0ling Thermostat CHT 18-60 3aaT76A21A55 30 VAC 1.5 Amps Goodman Mfg. Corp.


Here is what I would try to see if the thermostat is bad. Take the facing off the thermostat. Once this is done you will see where the wiring is connected should be a red green yellow and white Turn off power to unit make a diagram as to where the wiring was connected red to r green to g and so on Remove these wires red green and yellow and twist them together Go to the power source and re energize the unit once this is done all components should come on if not the thermostat isn't your problem Red is your low voltage power supply (24 volts) Green is your fan motor in furnance, yellow is your outside cooling unit. 1 other thing you might check. In the furnance if the doors are not properly installed on the face of the furnance it may not allow the unit to come on. There is a safety switch on the furnance where the filter is that if the door is not put on properly the whole system loses power and will not work. Hope this helps. Good Luck

Dave

Sep 15, 2009 | Heating & Cooling

1 Answer

Outside unit won't run


If the inside unit is running properly, there will be a yellow wire (or blue) from the thermostat down in the furnace that needs to be hooked up to the Y terminal also there is a red and white wire in the same place in the furnace coming from the outside unit, one goes to the Y terminal also and the other would go to the C terminal in the furnace. Otherwise you may have a bigger problem.

May 29, 2009 | Carrier 38BRC036 Air Conditioner

1 Answer

Defrost circuit board


he prob. jumped the reversing valve wire (usualy marked "O" or "B" on the stat and terminal board
(defrost board)

Dec 29, 2008 | Heating & Cooling

1 Answer

Incorrect Wiring for Thermostat


Do it right. Have the wiring changed so it works as it is supposed to. The remote control would make controlling the heat a manual operation. I don't think you want this.

May 01, 2008 | Carrier 52CQ315 Air Conditioner

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