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Coleman evcon moblehome ac question

I need to replace the contactor on my unit. The new one is identical to the old one EXCEPT the T1 and L1 are where the T2 and L2 are on the old one and vice versa. QUESTION Do I move the wire to that side or wire to the T2 and L2 or not use this contactor. Thanks eddiebuck

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I would replace them to the exact terminals that they used to be on. Technically speaking L1 and L2 stand for Line one and Line two. This would be the incoming power from the breaker or disconnect switch. T1 and T2 are the power leaving the contactor relay.

Posted on Jun 17, 2008

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I have a Coleman mach 3 ac unit. ive replaced everything except the compressor. the fan will come on but when i put it on ac it blows the fuse in the thermostat.


Fuse in the tstat?? First inspect the low voltage wire outside for imperfections, such as bare wires. Unhook the low voltage wires to condenser outside and cap with existing wire nuts. Then replace fuse and turn system on with cooling. If fuse still good then you have a short in the contactor coil in the condenser. Need new contactor. If fuse only blows when a call for cooling it's in the wire for low voltage or the contactor itself.

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First question first, NO! this is a simple problem and a common one to fix, just change out the outside contactor coil, the contactor has a thin layer of silver on them to prevent them from arching and sticking together, over time this thin layer burns through and stick the contactor and wont let go, till you replace the contactor coil,(20.00) 24-volt 40 voltage amp coil! YOU CAN DO THIS after you kill the power to the unit.!Thank-you-very-much!

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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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On single phase your incoming power lines go to L-1 & L-2, the lines to the compressor go to T-1 & T-2. With A/C current it does not matter which one goes to which side as long as the line goes to the L side and the compressor power lines go to the T side. As long as the coil voltage is correct any contactor will replace the original.

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