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New 2P 30A contactor, not labeled with "T" and "L" ends.

I am replacing an old 2 Pole, 30A 24V Honeywell contactor with a new Square D one. The new contactor is perfectly symmetrical, with coil terminals on both sides, and is not labeled with specific T and L ends. Am I right in assuming that either end of this contactor can be "T" and "L"? (I.e., which way I install the contactor doesn't matter, as long as all of the wires go to the same ends as before.)

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  • pmrowley Apr 21, 2009

    Sorry, this was posted in the wrong area. I'll close this and repost in the general HVAC area.

  • Ken Bledsoe May 11, 2010

    You are right.

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It will work either way....

Posted on Apr 21, 2009

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Yes you can use either end of the contactor , but put all the wires in the same place they were before doing it one at the time.

Posted on Apr 22, 2009

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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

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Hi,
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My Contactor went out on my UPKA-031JAZ I went and was told a Honeywell DP1030A5013 contactor would replace the one that went bad. So how do I wire the Honeywell to the old one since they don't look like...


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heatman101

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1 Answer

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2 Answers

I need assistance with swapping out a contactor.


I don’t believe changing the contactor to a double pole contactor will solve this problem. It appears by your description that bugs are being attracted to the contact points on the contactor. Changing to a double pole contactor will not eliminate that problem but only provide another contact point for the bugs to be attracted to. The most effective solution would be to replace the current contactor with a sealed design where the contact points are totally enclosed. Enclosed contactors are completely enclosed protecting it from bugs and dirt. These type of contactors are available in the single pole design so no further wiring modifications are needed. You can consult a professional A/C service company like mine for more information and assistance.

Hope this helps. Let me know if there's anything I can do for you!

Sam, The Service Expert
Visit Sam's Blog

1.888.HEATCOOL
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Apr 30, 2009 | Ruud Central System Air Conditioner

1 Answer

Carrier A/C units


Double check that the new contactor has the same electrical ratings on it. My guess is that the coil should be 24v while the relay should be able to carry the same amperage at 220v.

First shut off the breaker and disconnect switch for the furnace and outdoor condenser and call a licensed HVAC contractor:)

If you are determined to do it yourself, Then read the schematics first. Be aware, if you mis wire the system you may cause more damage than you have now. Not to mention your personal safety is at risk.

I am basing this on the most common style contactor found in my area.

The main relay side should be labeled. (eg. L1,L2-T1, T2). These should match exactly like the old one. L1 and L2 are the incoming power. T1 and T2 are the power leaving the contactor. All the 220v wires should correspond to one of these four terminals either by screwing them down or fitting the spade connectors together.

Usually the 24v wires will plug onto the coil (near the bottom, left and/or right sides of the contactor) silver spade connectors.

(STEP 1.) Leave all Wires Connected to your Old Contactor.
(STEP 2.) Remove the two mounting screws that hold the Old Contactor to the Air Conditioners casing.
(STEP 3.) Now Install the New Contactor to the old contactors existing location using the Same two Screws.
(STEP 4.) Now take Off one wire at a time from your old Contactor and Install each wire one at a time to the proper location on the new Contactor.

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