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Wire a 220v heater to a transformer, contactor, and thermostat

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One side of transformer secondary to one side of contactor coil. the other side of transformer secondary thru t stat to other side of contactor coil. line voltage 220v to l1, l2 of contactor . other side of contactor to load (220v heater. ) Make sure heater has some sort of overload /overheat safety either breaking line voltage or control voltage 24v.

Posted on Nov 27, 2013

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Posted on Jan 02, 2017

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SOURCE: electric space heater contactor won't stay latched

Jumpered the bimetal thermostat and everything worked smoothly. Tried to clean contacts in thermostat with no luck, so ordered a replacement. At least it was cheaper than the contactor.

Posted on Dec 12, 2008

  • 22 Answers

SOURCE: Bought 44155c hunter thermostat air won't turn on.

If unit worked before you tryed changing t-stat then its possible the t-stat wires are shorting each other out.take t-stat back off cut back wires a good 6 to 10 inches or if you dont have that much wire to play with just cut back as far as you can and make sure there is no bare wire touching each other ,then just to test unit to make sure its working ok twist yell.,red,green together this should bring both units on and should blow cold.if this works up to this point on the new stat read directions closely there might be a jumper wire in the stat that needs connected usually from y1 to w1 you would install a jumper wire .see if this helps if not write back i have 1 other solution.i hope this helps

Posted on Sep 15, 2009

  • 221 Answers

SOURCE: I have a Dayton 3UG73D heater that I need to hook

Here is your manual: http://www.air-n-water.com/manuals/G73.pdf

Posted on Jan 24, 2010

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Compressor want come on


Here is what to do . Pull out or turn off Electrical disconnect behind unit . Carefully remove panel covering controls in unit . Note most units have a flat panel with a few screws, but some GE units have a welded metal box on top of unit which needs to be removed. After exposing controls. replace or turn on disconnect. Then take a plastic handled screwdriver and push in on center of contactor (boxlike part with a lot of wires hooked ) If the compressor now comes on release contactor , and check for 24 Volts AC at base of contactor where thermostat (small wires that run on outside of black refrigerant line ) with thermostat on and calling for cool you should measure 24 to 28 volts . If voltage is present replace contactor after disconnecting from power. If no voltage go inside , remove cover from thermostat, and check for 24 volts between red ( R) and yellow (Y ) terminals on thermostat , If voltage is present , replace thermostat , no voltage check voltage in heater / air handler if you have voltage at air handler , replace thermostat wire from heater to thermostat / if no voltage check for blown fuse in heater , this should be either an inline fuse or an automotive type fuse plugged into circuit board (with power to heater disconnected check broken wire or black mark in fuse when held up to light. If fuse good turn on power to heater and check for 230v to one side of transformer, if you get voltage to Primary (incoming side ) of transformer, check output side of transformer for 24 - 28 volts. If transformer shows input but no output replace transformer after turning power off. If you heard a buzzing or grinding noise , when pushing in contactor , but compressor didn't start look at run capacitor (this is round or oval shaped object with wires going to contactor and compressor ) Looking at area where wires plug this should be a flat surface , if it looks domed shaped or bulging out , it is blown and needs replaced , use same mfd rating and 440 Volts to be on safe side. / If there was no noise from compressor when contactor was pushed in , put your hand on top of compressor (black object in center of unit ) If hot , allow to cool for at least three hours with power to unit turned off and retest . If compressor comes on after cooling , check for bad fan motor in outside unit (it may make a squealing or wining noise and stop runing for a while , also check for / clean outdoor coils
Hope this helps .
Thanks,
Alex


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1 Answer

All of the sudden tonight it was getting hot went to adjust thermostat and it was blank. No air and no fan. Bought new thermostat (above). checked circuit breakers. thermostat shows it is on but wont kick...


At the thermostat you have several colored wires. Touch the green and red wire together and see if the indoor fan comes on. If you know what wire goes to the coil on your AC contactor touch the red wire to that wire. If it starts the outdoor fan and your compressor the thermostat is not wired correctly. All you are doing by my suggestion is bypassing the thermostat to eliminate it as the possible problem.

The outdoor AC contactor coil wire is usually yellow or blue, but you must make sure not to short the red wire to the other side of your transformer as that will cause you to have to buy a new transformer. Your unit wire diagram should show the wire to the AC contactor coil. You need to determine which wire feeds the AC coil which closes the contactor to the compressor and outdoor fan motor.

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1 Answer

My Fahrenheat baseboard strip heater is a 1996 model, 120 volts. It only works for one thermostat cycle. The thermostat points open slowly and arc as they open. The points will not reseat to supply any...


Why not get a 24 volt definite purpose contactor and connect it to power?
Use a transformer to open and close the contactor and then you can use a low voltage 2 wire el cheapo wall thermostat to turn on the heater?

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How do you wire the Honeywell RTH8500D thermostat so as to operate it battery-free from the main power, yet have battery back up? Info online and in manual does not appear to address this, yet on package...


You would need to have a the hot wire from the transformer which would be the red one and connected to R/Rh/Rc. You would also need a common wire from the transformer connected to the C terminal on the contactor. It is usually a blue or brown wire. You would need to look at the transformer in the airhandler to see what color the common is. The secondary wires on the transformer are usually yellow and blue so you will need to look where these connect to the thermostat wires to see which is the common. Also your existing thermostat wire may not have enough wires in it to do this. Let me know if you have any questions.

Jul 13, 2010 | Heating & Cooling

1 Answer

How to wire a mechanical room thermostat. There does not appear to be a neutral terminal.


Some thermostats don't have a terminal for a common wire. They just receive 24vac from the transformer and when there is a call for cooling or heat closes contacts that send power to whatever relay or contactor that needs to be operated.

May 02, 2010 | Heating & Cooling

2 Answers

Mr. Heater Natural Gas Garage Heater - 45,000 BTU. Power 120 volt and 24 volt good. Thermostat calling for heat, but nothing happening??


Check for a fuse either in-line or on the circuit board. There should be 24 volts going to the thermostat. If not, you have either a bad transformer or a bad thermostat wire. Jump out the terminals that the thermostat wires are connected to. This should force the unit to fire. If not, bad circuit board.

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1 Answer

Installed dayton nat gas hanging furnace in garage and have 2 wires dont know where they go one came from the back side of the transformer it was twisted with the other wire


Hopefully there is a wiring diagram glued to one of the panels to verify but on the transformer you will have 2, 110 volt wires. One is the power coming in (usually black wire) and the other is a common (white wire) and will be connected to other common leads. On the low voltage side of the transformer one wire will go to the thermostat then from the thermostat to the gas valve. The other side will connect to the gas valve. When the thermostat calls for heat it completes the circuit from transformer to gas valve back to transformer.

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1 Answer

Compressor will not start, GSC14-14 SEER


Control wires come from the thermostat to power the contactor coil. At the thermostat the red wire must power (switch) the yellow wire to make the contactor pull in to run the outside unit, Check power with a ac volt meter between the red wire and the yellow wire, with the heat/cool switch turned to off. If you do not have 24 volts ac, your wire may have an open from the thermostat to the outside unit, your transformer may be bad and not supplying power, or your contactor coil may be open

Jun 23, 2009 | Goodman CKL30AR30 Air Conditioner

1 Answer

My ac unit does not have power to the thermostat. There is 200 volts going into the transformer and 24 volts going out. There is 24 volts on the back side of a terminal with thermostat wire running to the...


Please exercise due caution in checking voltages in live circuits!

24 volts sourced by the transformer, through the thermostat, then through the contactor (turns on power to compressor/fan) and returns to the transformer, If the thermostat is closed (calling for cool) you will see no voltage across it, but instead the contactor should be energized. Please note, 200 volts seems odd, you should have between 215 and 235. It sounds more like the contactor relay coil may be open. Is the contactor/transformer one piece?

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1 Answer

Goodman 2.5 ton heat pump


Loss of 24 volt power either from thermostat or transformer. Check for voltage across low voltage side of contactor (the small wires).

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