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Which terminals on a FC80D11 CONTACTOR Energise the coil to activate the contactor

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Posted on May 14, 2009


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I have 24 volts but the unit will not come on unless i jump it ouy

Please explain "jump it out". Are you jumping the 220V across the terminals on the unit, or are you jumpering the 24V to the coil of the contactor?

If you have 24V at the contactor, but it does not engage, more than likely you have a bad coil on the contactor. If you have a simple multi-meter, you can do the following to make sure it is the coil:

-Turn power off to the unit. Never work on something live unless you are qualified and know what you are doing.

-Take the 24V wires off their terminals.

-Turn your multimeter to the resistence (ohms) setting.

-Place the leads across the terminals on the contactor that the 24V power was applied to. Look for a reading between 10 ohms and 70ohms. If you do not get a reading (infinity resistence), then the coil has burnt out. If you do get a reading, you may have a sticky coil.

-Odds are that the coil is bad. You maybe able to source just the coil for the contactor, but more than likely you will end up purchasing the entire contactor. I believe you can get them through Home Depot, and I know you can get them through Grainger.

Jun 24, 2012 | Goodman CKL36AR36 Air Conditioner

1 Answer

Ruud compressor relay not working a/c

Hello,im assumimg you are referring to the contactor coil on the oudoor unit. First you must verify if the coil is receiving 24 volts from the thermostat at the coil terminals, if not there is a problem with the low voltage circuit, possibly a a open thermostat wire or a fuse blown on the indoor control board. If ther is 24 volts at the contactor coil and it does not engages then the contactor coil must be replaced

May 24, 2012 | Ruud UAMB Air Conditioner

1 Answer

I need to put a 24 volt coil relay in my furanace for an EAC and I'm not sure how to hook it up. I'm guessing the low voltage wires from the thermostat (w & b wire) will go to coil side and...

Electricians don't guess, they test.
Usually 'relays' used for HVAC are called contactors, for some reason.

1) 24Volt wires connect to coil. Make sure contactor coil is rated 24Volts or 24vac
Coil terminals are typically located on side of contactor.
Usually you can see small copper wires from coil that are soldered to these terminals.
Test across terminals with multimeter set to read ohms, and you will get ohm reading of coil.

2) The 120V or 240V wires connect to terminals located on ends -or- on top of contactor.
If there are three terminals, then check these terminals with multimeter.
Push down contactor to simulate the contactor turning on and off.
Hold contactor down and test terminals again.
And compare test results with same test from old contactor being replaced.

3) Open following link to see typical 24V coil contactor with DPST with 2 NO contacts
The contactor shown in diagram is similar to your contactor, except the contactor shown has 4 terminals for 120V or 240V. This is why testing contactor and comparing with old contactor is necessary.

Sep 20, 2011 | Honeywell International Honeywell...

1 Answer

My ac is blowing out air but it is not cold and the fan outside is not running

Hello, first thing to check is if you are getting voltage at your outside disconnect, you should get 240 volts, if not check for a tripped breaker or a blown fuse. next check power at the contactor coil you should have 240 on the line side of the contactor. If that checks out good check for 24 volts at the side terminals of the contator coil, if you have 24 volts at the coil does not energize than you have a bad contactor coil. If there is no 24 volts at the contactor coil side terminals than either there is a problem with the thermostat or low voltage wiring. and finally if that all checks out good than your capacitor must be replaced.

Apr 25, 2011 | Heating & Cooling

2 Answers

My outside unit want come on


Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool...

AirConditioner Trouble - Review the Possibilities


Apr 23, 2011 | Goodman CKL24AR24 Air Conditioner

3 Answers

99 explorer fan only works on high

You need a blower motor resistor pack, follow the wire from the motor it will go into a connector with a few wires at the resistor pack. it's held in by 2 screws- easy to change.

Jan 22, 2011 | 1999 Ford Explorer

1 Answer

On terminals 6 & 7 do you need to apply a power source? is terminal 2 the hot from breaker and #3 the neutral terminal?

Following page has Dayton timer wiring:

Terminals 6 and 7 are wired with 120Volt power as shown.
The push button gives momentary impulse of electricity to timer.
Timer activates when impulse of electricity ends.
Timer activation turns Load ON and begins countdown.
When countdown expires, timer turns Load OFF.

Terminal 2 is 125V Hot from breaker.
Terminal 3 is Neutral.

Terminal 1 goes to Load.
Load cannot exceed 1 amp.
So Dayton timer can only control single 100 watt light bulb, or it can control 120Volt coil on contactor.
Contactor turns on Load with any voltage: 120, 240, 277, etc or 3 phase contactor.

Suggest busman in-line 1 amp fuse between terminal 1 and Load to protect timer.

Jan 05, 2011 | Dayton Audio Dayton 6a857 Solid State...

1 Answer

Model 6a858 what does each pin do 6and 7 are a n/o contact ,1,2 and 3are what configuration. Running 2 load augers for agrain bin ,want to run 2nd one 5sec longer

Load can't exceed 1 amp, so you'll need a contactor with 120 Volt coil to control load augers.

To run 2 load augers, you need a second Dayton time delay. And another contactor.

Local heat-air conditioning supply carries contactors.
Grainger contactor with 120V coil and 25 amp capacity across terminals
Fasco H230A with 120V coil and 30 amp across terminals

Oct 04, 2010 | Amperite Dayton Solid State Timer On Delay...

1 Answer

A/C unit air handler comes on inside but outside compressor does not come on. The contacts are not working. If I hold down the contacts the compressor comes on and unit works.

Check and find out if you have 24 volts across the terminals for the coil of the contactor. If you have 24 volts across the terminals and the contactor does not pull in change the contactor with one of the same ratting. If you do not have 24 volts across the terminals for the contactor coil your problem in in the 24 volt circuit. Possible that the thermostat is not sending power to the contactor through the "Y" terminal.

Jul 20, 2008 | Ruud Heating & Cooling

1 Answer

Power failure


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Mar 29, 2008 | APC Silcon UPS System

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