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Gas heating/electric a/c unit

Can a gas heat/elect a/c central unit t-stat be temporarily bypassed until it can be replaced, and controled maybe by a circuit breaker? To get temp relief from this heat? Thanks

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YES! just remove the cover and you'll see 4-wires r-red=power g-green=fan w-white=heat &y-yellow=cool: just take a jumper wire and connect r-to- g and y...!_

Posted on Sep 09, 2008

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Electric heater blows cool air unless i turn the thremostat up at least 5 degrees higher then it goes to high and blows warm air


If it's "dual fuel" like heat pump with gas heat, the heat on the heat-pump side won't "feel" warm in the extreme temperatures we've seen in much of the country lately.....2nd stage gas will feel MUCH warmer. If purely electric, 1st stage heat may be off due to a manually resettable high limit switch/ bad heat contactor (giant relay), or a misapplied or defective thermostat. NOTE: if somebody recently painted OR wallpapered, AND it's a mercury-bulb T-stat, It HAS to be level and the connections must be tight!

Jan 28, 2014 | Ruud Central System Air Conditioner

1 Answer

I have an early 80's mobile home with an "intertherm gas atmospheric furnace" pilot light is lit but can't get the furnace to "fire". Seems as though the limit control is stuck open. ...


If your pilot light is lit then I would first check your thermostat. Make sure it is on heat setting and fan is on auto, turn stat up to where it should be calling for heat. If you don't get burner to light remove front cover from thermostat and see if it has a mercury switch, if it does move temperature selector up and down and see if you can see a spark in mercury switch vial. If y ou cannot see a spark remove screws that attach t-stat to base.Remove carefully and disconnect wires that go to r and w terminals on stat base. Temporarily connect these two wires together. This should make burner light if you have power to thermostat. If burner does light disconnect wires and replace thermostat. Also if you have a volt meter check across these two wires and see if you have power there. Should be around 24 volts a.c. If your thermostat has a fan on setting try that. If fan runs you know you have power to furnace The gas valve needs 24 volts to operate and inside the electric control box in furnace there is a transformer to step down 110-120 supply voltage to 24 volts. If transformer is working you should be able to hear a low buzz or humming sound. You can also check across gas valve terminals when t-stat is set for heat, you should read about 24 volts. If you have 24 volts to gas valve and it is not opening then you need to replace gas valve. The main purpose of the limit switches is to turn blower on when temperature in heat exchanger reaches fan on temp,shut off blower after burner shuts off and heat in heat exchanger reaches fan off temperature, and limit if temperature exceedes set point without blower coming on. I hope this helps you. Thanks

Nov 25, 2010 | Air Conditioners

1 Answer

I installed a new Honeywell Programable thermostat, When I turned on the AC it turned on the Heater... I followed the wiring but some of it is not making sense... G=Green, Y=Yellow, R=Red, C=Blue,...


Hi, the problem is you have bought the wrong thermostat for the unit if it is not a heat-pump. A heat pump will have W-1, W-2 for heat strips, and Y-2 is for 2nd stage cooling. G is Green for Fan, R is Red for Power, Y is Yellow for cooling, and W would be for Heat. This is all you need if you have gas heat, Orange is for a reversing valve for a heat-pump, and the blue is also for the reversing valve on a Rheem heat-pump. The stat you need will have these terminals, if you are sure its not a heat pump, which I am sure you would know. The stat you need has these terminals. RC and RH. It will have a Red jumper wire connecting the 2 terminals. This is where the Red wire connects, to either one, as they connect together. Connect G to Green, Y to Yellow, and W to white. Since you only have one control transformer, that's why the stat has RH for Red Heating, and RC for Red cooling tied together. Just hook the red coming in to either one. You need only, R, G, Y, and W, to run this unit. Look at your old stat and check the terminals. A heat-pump, uses many more conductors to operate it. O or orange for the reversing valve, blue also depending on the unit. C for common, W1 for stage one heating, W2 for stage 2 heating, Y1 for stage one cooling and Y2 for stage 2 cooling. This stat is used for a commercial unit with multible stages of heat and cooling. If you have a common wire and no batteries on the old stat, go to the indoor unit, remove the panel, and see if you have a common wire hooked up, such as the brown, black, or maybe blue. If so, you will need to hook it up at the stat if it has a C terminal. If it has batteries, just take all of the extra wires and shove them in the wall. You won't need them. Just the R, G, Y, and W, and you will be back on line. Very easy.
Please rate me. Take it back and have them sell you the right stat. Please keep me posted and I will be here if you need my help. Thank you for using Fixya.
Shastalaker7
A/C, and Heating Contractor

Nov 23, 2010 | Goodman Air Conditioners

1 Answer

I bought the amcorair one of the inside units is not working right. IT IS SET ON 72 degrees and it does not cut on even at 66 degrees.


Hi, from what you are saying, it sounds as though you have a control/thermostat problem. You say it doesn't work right, so I am assuming it does work, but just does not come on when the stat calls for heat. Make sure you have 24 volts to the stat. Turn the fan to the on position to see if it comes on. If so, you have power. If the heat is not coming on at 66 degrees, and you have it set to call for heat below 72, you do have a problem with this stat. The room sensor is mounted in the circuitry of the subbase, or second section of the thermostat. There is nothing you can do to repair this stat, your only option is to replace it. If you have both heating and air, you will need a stat for that. If you have gas heat get a regular central heat and cooling stat, 24 volts. If you have a heat-pump, you will need a heat pump stat. The best thing to do, is shut off the power to the indoor unit. Remove the first section of the stat, it should just unsnap. You may need to pull some to get it off. Then you will see the subbase with the wire terminals. If you have gas heat, it will be marked something like this. RH to RC with a red wire connecting the two. You will have a smaller red wire coming in from the indoor unit which can go to either one. You will see Y yellow for cool, W white for heat, G green for fan. If its a heat pump stat, you will have many more terminals such as o/b, may have E and C, w-1, w-2. Draw you a diagram of the wiring and the terminals they go to. Now, remove the subbase. It will be held to the wall with a couple of screws. Take it with you, and go to Home Depot, Lowe's Hardware, O.S.H. to get a stat. Try and find the same one, but it will not matter as long as you have the same terminals. Many stats will work on many units. Install it in the reverse order. This drawing is very important for you. This will indeed solve your problem, and is very simple to change out. If you have any questions when doing this, please contact me, as I will check in on you. It may take time for me to respond if I am on another call. Please don't forget to rate me on this, I know you will be kind! :))
Sincerely,
Shastalaker7
A/C, & Heating Contractor PS, Don't loose the manual for your new stat!! Put it in a safe place, this is very, very important.

Nov 21, 2010 | AmcorAire UCHW-H12AF2 Split System Air...

1 Answer

Replacing a Coleman with a Duotherm, can the same thermostat and controls be used?


Hi, yes you can use the same thermostat if you are replacing the unit that has the same sequence of operation. What I mean is, if the old unit is a gas fired furnace and outdoor condenser split system for the a/c you can use the same controls, or if its a package unit. Now, if you are installing a heat-pump unit in place of a gas fired central unit, you will need to pull more stat wire and buy a heat-pump thermostat to make it run.
Shastalaker7
A/C, Heating Contractor

Oct 12, 2010 | Coleman Mach III Air Conditioner

1 Answer

M/n 38brb060300 carrier


Hi, to tell if your unit is a heat-pump or not, if the indoor unit is not gas fired, it is a split system heat pump. If it uses gas or propane gas, its a split system gas/elect unit. Look at your thermostat also. It should have aux heat, emergency heat on it also. Maybe not both, but you will know if you have a heat pump. Please don't forget to rate me. Please be kind, as I know you will. Just remember, no gas, its a heat pump, gas fired furnace indoors, its not a heat pump.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor.

Jul 15, 2010 | Carrier 38CKC060 Air Conditioner

1 Answer

It's cold out, and my Central Air kicks on every time my furnace kicks in. I get heat, but don't think my outside unit (fan) should be kicking in each time my furnace kicks on. Suggestions


Hi, If you have what is called a heat pump, the outdoor unit is supposed to run. It has a reversing valve which reverses the flow of refrigerant and the indoor unit becomes the condenser and the outdoor becomes the evaporator coil. Now, if you don't have a heat pump and the furnace is gas fired, then the control wiring or thermostat is calling for both to come on. Control wiring has to be touching together somewhere and bringing on both. Look over the exposed stat wire outside if you have a dog that may have chewed the wires, I have seen this happen. If all wiring looks good, then the stat is faulty and must be replaced. Make sure you don't have a heat pump first, as the fan, compressor, and all will run on heat and cooling. I hope this will solve you're problem, please let me know, I would like to hear back. Sincerely,
Shastalaker7

Nov 20, 2009 | Air Conditioners

2 Answers

Bryant-Carrier Furnace Fan Stays On


I suspect a bad fan relay or bad fan control. Maybe the longer the control or relay is in the on position the more chance of it sticking on.

Oct 17, 2009 | Bryant 462AJC021BA Air Conditioner

1 Answer

No heat coming from central air unit when heat is turned on.


check t stat make sure its set up for you system some stats have to be set up for a heatpump or iits gas or electric heat

Feb 25, 2009 | Air Conditioners

1 Answer

Thermostat is not turning on the central air unit.


Check electrical breakers turn them off then back on. To reset them.
How long has it not worked?
Does the fan come on if you put the fan in the ON position on the t-stat.?
Is this a heat pump? If so does any lights show up on the t-stat if you put the t-stat in emergency heat?
Give me more information.
Help me out so I can help you.

May 19, 2008 | Air Conditioners

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