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Contactor wiring diagram. Need to know how to wire a contactor to switch off electric boiler when electric shower is being used. Thanks

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Inter lock two contactor used auxiliary contact if 1 then the other is 0.

Posted on Oct 04, 2010

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New Contactor not pulling in on coleman ac unit


The contactor is powered by another device that is not able to handle the current. It is essentially a switch. You need a wiring diagram for the unit and have to use a meter to check voltages for the contactor. Make sure that it is wired right also. The voltage should be in the neighborhood of about 24 volts on the coil side.

May 12, 2015 | Coleman Heating & Cooling

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I need to run a contactor ( 40 amps 3 phase ) with the help of thermostat..i have connected L1,L2 n L3 and output coneccted in T 1 T2 T3 . now how to connect A1 and A2 .... i want that contactor should...


1) Copy following links for illustrations showing timer controlling contactor in 3-phase environment:
http://waterheatertimer.org/How-to-install-3-phase-timer.html
http://waterheatertimer.org/images/3-phase-timer-diagram-24Vac-865.jpg

2) Substitute thermostat instead of timer for switching control.

3) I don't know what thermostat you have, or if it's functioning or the rating.

4) Which contactor do you have?
Do you have a 3-phase contactor??
Or two-pole single phase contactor?

5) Match thermostat output voltage with contactor voltage:
Thermostat output is 24 volt? Then use 24Volt coil on contactor.
Thermostat output 120 or 277 > then use contactor with same coil rating.

6) More information is needed.
I don't understand description of your wiring.
Add a comment and compare with illustrations sent, so I can visualize ... or attach photo and/or give product numbers so maybe I can locate wiring diagrams.

Jan 31, 2013 | Connecticut Electric Electrical Supplies

1 Answer

Wiring diagram for sunquest pro 24 tanning bed


I do not have a diagram, but the contactors are really simple. You have 2 power switches on top of contactor and 2 wires going to the coil. There should be 4 larger wires on top, 2 in and 2 out.

If any of the crimp-on wire fasteners are blackened, then have a trained technician to replace the fastener. If bed comes on when pushing down on contactor with a plastic ink pen, then check the timer by turning on the timer and checking the voltage at the Main Relay Coil. If no voltage, then the timer is bad.

Jul 31, 2012 | Wolff Sunquest Pro 24RS 220 Volts

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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.
http://waterheatertimer.org/images/ON-delay-timer-diagram2-300.jpg

Sep 20, 2011 | Honeywell International Honeywell...

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I am a Home Inspector. How do I override the timer controls to produce heat at the ETS units so my clients can see that they work. I put the timer lever in the manual position however after 30 minutes no...


You posted under ET70415CR. This is a complicated timer with many wiring and programming capabilities.
Open following links for ET70000 series image and ET70414CR instructions:
http://waterheatertimer.org/images/ET70115C-copy.jpg
http://waterheatertimer.org/pdf/Intermatic-et70415cr.pdf

Among the features, this timer can be programmed for pulse or momentary action to control external latching contactors:
Page 36 of instruction says:
Note: Using the manual On/Off keys to switch this type of contactor On or Off may not provide the expected result and may cause damage to the contactor coil. For this application external Momentary Pushbutton may be added for both circuits or the circuits may be programmed for override pulses.
So instruction is saying that additional wiring is needed to override specific types of circuits.

The timer has 8 internal contactors, and each can be controlled separately by the timer to control 8 different electric circuits. This is called 8-channel timer since all eight timing contactors can be programmed separately.
Each contactor is wired separately to control any type of electrical appliance including 440V lights, and 24V alarm system, and 240V heat, etc.
For example contactor1 might be for lights, and contactor2 for controlling a latching contactor, and contactor3 for controlling a boiler, contactor4 etc...

To override the system, you have to identify which contactor controls the system in question.
Then there are 2 options:
1) Reprogram the timer on that channel
2) change the wiring temporarily: Each of the 8 contactors has 3 screw terminals: COM, NO, NC. If there are wires on all 3 NO NC COM terminals, you have to reprogram timer. If there is a wire on NC terminal -or- NO terminal, typically you would move that wire to the COM terminal to by-pass timing operations.

Jun 23, 2011 | Intermatic ET70415CR Energy Controls - ETS...

1 Answer

The unit will not start for the summer. It worked last summer.


Open the control box and see if you have around 220-240V at the bottom of the contactor. The contactor is the switch looking thing in the bottom. If the unit is calling for air it should have a button in the middle that is pulled in. If you are not getting the volts at the contactor then you need to find the electrical problem.
If you have the correct voltage then look and see if the contactor is connected. The middle button should be pulled in. If you have one where you are unable to see the button, or it is not pulled in, Check the low voltage wiring. This is done by checking to see if there are 24V-28V on the side terminals of the contatcor. These terminals are located on the sides of the contactor. (some contactors have both sides of the 24V on one side.) Either way you should read 24-28V when checking across the two terminals. If you do not then you have a problem with the control wiring. (cut with weed eater, chewed by mouse etc.) I know the 24V coil is good because the inside unit is running. If the contactor is pulled in and the outdoor unit still does not run check and see if there is power at the other end of the contactor. (The end the switch breaks off)
If the switch is pulled in (or you read 24- 28V on the side of the contactor, and there is 240 V coming in on the line. Chances are you need to replace the contactor. Disconnect the power and pull one wire at a time of of the old contactor and install it on the new. After all of the wires are on the new one, remove the old contactor and throw it away. Screw the new contactor with all of the wires back onto the unit. restore power. Often times in our part of the country, there will be ants stuck in the points of the contactor. Just cleaning the contactor will buy more time.
Hope this helps.

Jul 11, 2010 | Carrier 38CKC024 Air Conditioner

1 Answer

How do I wire two telemecanique LC1DO910 contactors to operate periodically turning each other on and off. I am going use them to power water pumps, guided by float switches. All I need is how to wire the...


Interlocking. pump1. line 1 to auxiliary normally close contact of contactor #2 to holding coil of #1 contactor, line2 to float switch then to holding coil of #1 contactor.

Interlocking. pump2. line 1 to auxiliary normally close contact of contactor #1 to holding coil of #2 contactor, line2 to float switch then to holding coil of #2 contactor.



Nov 15, 2009 | Electrical Supplies

1 Answer

On outside compressor for whole house AC: Critters ate wires. Have Blk & Red power in from breaker. 24vac switched from thermostat. 1 contactor with 24vac coil(original). 1 Capacitor w/ 3 terms...


There should be a wiring diagram on the back of the access panel. If you can't read it, check online for model wiring diagram. Don't guess, you may cause more expensive damage.

Jun 25, 2009 | Heating & Cooling

1 Answer

Cutler hammer a10ano series a-1 contactor


There should be 2 contactors for forward and reverse. you have to wire them so that the power coming in will switch 2 opposite phases to reverse.

Apr 10, 2009 | Plumbing

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