What Ohm Reading Should I Get on a 24 Volt Coil on a Contactor

Electricity is i of a few different power sources that can be used to fuel an air conditioner or furnace. Electrical parts of an AC unit unremarkably include the heating pump, which regulates temperature, and a blower fan, which helps distribute hot or common cold air. Often times, when something like a blower stops working, it's the result of a smaller electrical component failure—such as a contactor.

What Does an AC Contactor Practise?

Ac contactors regulate the flow of electricity throughout your unit. They work in conjunction with the compressor and condenser unit in your AC to form the electrical ability unit of measurement. When you turn your unit on, the contactor receives a low voltage signal that creates a magnetic field. Like a span, this field closes the circuit within your unit of measurement, allowing higher voltage connections to have place. This is what powers the air conditioner's fan and pinch motors.

There are two types of contactors. A unmarried pole that contains a single magnetic scroll, allowing for one circuit connectedness, and a double pole that has 2 coils to make two excursion connections.

Signs of a Failing Contactor

Signs of a failing contactor can present themselves as either mechanical failures or concrete signs of damage. These are the most common.

Continuous running

The AC runs continuously, even when the unit is close off.

Clicking

Clicking is likely the upshot of an electric upshot, although information technology could mean a problem with the thermostat, compressor, or capacitor.

Unexpected physical deterioration

Noticeable to the eye and likewise known as pitting, this might occur every bit a result of farthermost temperature damage. Tin as well be the result of pests, debris, or other environmental factors.

Expected deterioration

Also noticeable to the eye, this would exist categorized every bit physical signs of wire deterioration every bit a event of time and usage.

Other Failure Signs

Of course, not all AC bug are a issue of a failing contactor. If y'all detect any of these other signs, it'southward all-time not to turn your unit on earlier y'all've made the necessary repairs.

Squealing

This may be the result of a cleaved or worn down fan belt and could prevent your Air conditioning from circulating common cold air.

Rattling

If the audio isn't nowadays when the unit is on, a loose fan or obstacle to the fan might be the cause.

Grinding

A grinding audio could be the outcome of worn motor bearings that need to be replaced.

Using a Multimeter to Examination an AC Contactor

In that location are ordinarily two contactors to each switch, marked as a line and terminal. The line (L) contains the voltage feed while the terminal (T) is connected to the electrical device beingness controlled. To test a contactor with a multimeter or voltmeter, use the following steps every bit a guide.

Pace 1. Remove wires from the line.

Remove electrical power to the L side of the contactor, then apply a screwdriver to pull the wires from the line-side screws. Marker wires to proceed runway (L1, L2, L3…).

Step 2. Remove wires from the last.

Repeat the same process on the concluding side of the contactor. Don't leave any wires behind, or you could go a false reading.

Step 3. Turn on the command switch.

Put the control switch of the contactor in the "on" position and look until you hear an audible click, followed by a humming sound from the contactor.

Step 4. Connect the multimeter.

Adhere the cherry lead to the ohm connector and the black pb to the mutual. Turn on the multimeter. Touch the two leads together; the meter should read 0 ohms.

Pace 5. Test each line.

Examination each gear up of L1-to-T1 contacts by placing the red lead to your L1 and the black lead to your T1. If any prepare fails to read 0 ohms, in that location is likely an issue with the contactor.

Step six. Check for a faulty coil connection.

Try cycling the control switch for the gyre and check for an audible click. If y'all don't hear one, it'southward fourth dimension to cheque the voltage of the ringlet.

Step seven. Check voltage.

First, cheque the specifications of the circuit to find the appropriate voltage information. Switch the meter to volts and move the cerise lead over to the volts connector on the meter, then apply power to the coil. Affect each pb of the meter to each connector on the gyre to cheque for the supplied voltage.

Step 8. Cheque ohms.

Remove the wires to the coil with a screwdriver and switch the meter to ohms. Touch each lead to the coil connectors and look for a reading betwixt 10 to 100 ohms. If you do not get this reading, you lot take a bad curl.

If your contactor or scroll is malfunctioning, yous tin purchase a new i separately to repair your AC unit. If your tests conclude that yous don't take an effect with your contactor, consider some of the other failure signs listed above.

Product Compliance and Suitability

The product statements contained in this guide are intended for general informational purposes only. Such product statements do not institute a production recommendation or representation as to the appropriateness, accuracy, abyss, correctness or currentness of the information provided. Data provided in this guide does non replace the use past you of any manufacturer instructions, technical product transmission, or other professional resources or adviser available to you lot. Always read, understand and follow all manufacturer instructions.

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Source: https://www.zoro.com/resourcehub/how-to-test-an-ac-contactor-with-a-multimeter/

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