Molly Ayala
Restringing an electric furnace element is a simple task that can be done by a beginner technician. It involves replacing the heating wire with a new one of the correct size and type, as well as possibly installing new limit switches and fuses. The process includes measuring the length of the old heater coil, writing it down, and then stretching out the new replacement coil to the correct length. It is important to verify the correct wattage, voltage, and type of ends before ordering a restring kit. Some kits come with a fuse, but if your element has a limit switch, a fuse may not be necessary.
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What You'll Learn
Verify wattage, voltage, coil diameter, and connection type
When restringing an electric furnace element, it is important to verify the wattage, voltage, coil diameter, and connection type.
To determine the correct wattage, add up the kilowatts (KW) of the coils. The total should be near or above the total kilowatts of your furnace. For example, if you have a 10KW furnace with two coils, you will need two 5KW coils. Remember, 1000 watts equals 1 KW.
The voltage of the restring kit should also be compatible with your furnace. For instance, a 15KW heat strip may require a voltage of 208-240V.
Regarding the coil diameter, it is important to ensure that the new coil is stretched to the length of the old coil. In most cases, it is better to err on the side of being slightly longer than shorter. When stretching the new coil, hold onto the bolts at each end and be careful not to overstretch or damage the resistant wire.
Finally, verify the connection type of your furnace element. The type of ends, such as bolt or spade, should be compatible with the restring kit.
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Clean filters and furnace for proper airflow
To ensure proper airflow over the heating elements of your electric furnace, it is important to maintain clean filters and a clean furnace. Dirty filters block airflow and make the furnace work harder, which can lead to reduced energy efficiency and even mechanical failure.
Locate the Filter: Find the filter air box on your furnace by standing in front of it and looking for the ducts. The filter is usually located on the return side of the furnace, where air is pulled in for heating or cooling.
Remove the Old Filter: Carefully pull out the old filter from its slot. Dispose of it properly or, if you have washable and reusable filters, clean them according to the manufacturer's instructions.
Inspect the Furnace: Before installing a new filter, take the opportunity to inspect the furnace for any dirt, dust, or debris that may have accumulated. Use a brush or vacuum to gently clean the area, ensuring no debris falls into sensitive components.
Install the New Filter: Purchase a new filter with the correct specifications for your furnace. Refer to your furnace manual to ensure you select a filter with the recommended MERV (Minimum Efficiency Reporting Value) rating. A higher MERV rating indicates greater filtration efficiency but may require more frequent cleaning or replacement. Slide the new filter into the slot, ensuring the arrow on the filter frame points in the direction of airflow, toward the furnace.
Mark the Installation Date: It is a good practice to label the new filter with the date of installation. This helps you keep track of how long it has been since the last change and determines when it's time for a replacement.
By routinely cleaning or replacing your furnace filters, you improve indoor air quality, enhance energy efficiency, and prolong the life of your furnace.
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Disconnect electrical connections and circuits
Disconnecting the electrical connections and circuits is a crucial step in restringing an electric furnace element. Here is a detailed guide to help you through the process:
Before beginning any work on your electric furnace, it is imperative to ensure your safety. Start by turning off the electrical power to the unit. Your furnace may have more than one circuit, so be sure to check for other breakers or fuses. This step is essential to prevent any accidents or injuries.
Once the power is turned off, the next step is to verify that all electrical connections to the unit are indeed cut. To do this, use a meter to test the connections. This step is crucial to ensure that there is no residual power running through the system, which could pose a safety hazard.
After confirming that the power is off, you can proceed to disconnect the electrical connections. Be systematic in your approach, and if possible, refer to a diagram or manual specific to your furnace model to identify the correct connections to sever. Keep in mind that different furnace models may have slight variations in their electrical systems.
If your furnace utilizes multiple circuits, ensure that you disconnect the electrical connections for each circuit. This step is important because you don't want any particular circuit to remain active while you're restringing the element, as it could compromise your safety or damage the furnace.
Finally, once all the electrical connections have been disconnected, take a moment to inspect your work. Double-check that all wires or connections are properly severed and that there are no loose ends that could potentially come into contact and cause a short circuit. At this point, you can be confident that the electrical connections and circuits have been safely disconnected, and you can proceed to the next steps of restringing your electric furnace element.
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Use a restring kit with a fuse
Restringing an electric furnace element involves replacing the heating wire with a new one. Before restringing, ensure you have all the necessary parts, including a restring kit for each coil, and new limit switches. It is also important to verify the correct wattage, voltage, and type of ends (bolt or spade) before ordering.
Some restring kits come with a fuse, which protects against electrical overloads. If your element has a limit switch, a fuse may not be necessary. However, it is recommended to install new limit switches and/or fuses during the restringing process.
- Turn off the electrical power to the unit. Check for multiple circuits and other breakers or fuses, and ensure all power has been cut.
- Measure the length of the old heater coil accurately and write it down. This is important because the new coil needs to be stretched to the correct length.
- Start in the middle of the new coil and work both sides towards the end.
- For 3/8" coils, feed the coil through the ceramic insulators. For 3/4" heating coils, hook the coil onto the ceramic insulator.
- Be careful not to get too close to the frame and the limit switches when bending the coil.
- Carefully insert two turns in the insulator.
- Replace the limit switches as these are often the reason for unexpected shut-downs.
- Install the fuse that came with your restring kit, if provided. If your kit did not include a fuse, and your element does not have a limit switch, install a new fuse.
- Inspect the fuse for any visible signs of damage, such as broken wires or a blackened appearance.
- Replace the fuse if necessary, using one of the same type and amperage.
Remember to wear rubber gloves when handling the new coils to avoid transferring oil or dirt onto them.
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Install new limit switches
Before installing a new limit switch, it is important to understand its function. A limit switch is an integral component of a home's heating system, serving as a critical safety and control device. It monitors the temperature inside the furnace and shuts off power to the burner when it reaches a certain level, preventing the system from overheating or overworking itself.
Now, to install a new limit switch, follow these steps:
Step 1: Turn off the furnace
Ensure your furnace is turned off and disconnected from the power source to prevent any electrical accidents. This is a crucial safety precaution.
Step 2: Access the limit switch
Open the furnace panel to locate the limit switch. Refer to your furnace manual or online resources for the specific location. The switch is typically located near the furnace unit and resembles a long metal tube connected to the unit's side.
Step 3: Remove the old limit switch
Disconnect the wires from the old limit switch, taking note of the configuration for reattachment. This step requires careful attention to detail, as incorrect wiring can lead to operational issues. Take pictures or make sketches to help you remember the exact configuration.
Step 4: Install the new limit switch
Attach the new limit switch using the screws provided. Carefully reattach the wires in the same configuration as the previous switch. Ensure that all wires are correctly connected and in good condition.
Step 5: Test the new limit switch
Once the new switch is installed, restore power to the furnace and test the system to ensure the new limit switch is operating correctly. This may involve observing the furnace cycles or using a multimeter to test functionality. Refer to your furnace manual or online resources for troubleshooting guidance if any issues arise.
Step 6: Regular maintenance
Regular furnace maintenance is essential to keep the limit switch working properly and ensure your safety. This includes cleaning the switch contacts with a soft cloth or brush to remove any dirt or corrosion that may have built up over time.
It is important to note that if you are uncomfortable performing these steps or if they involve handling flammable gas or high-voltage electricity, it is recommended to seek professional assistance from an HVAC technician. They have the expertise to handle the replacement safely and efficiently.
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Frequently asked questions
Restringing an electric furnace element involves replacing the heating wire with a new one. It may also be necessary to install new limit switches and/or fuses.
Restring kits for electric furnaces can be purchased from various online retailers, such as Mobile Home Repair, Coleman HVAC Parts, and AmericanHVACParts. Some manufacturers, like Carrier, may also offer restring kits directly.
Before beginning the restringing process, it is important to turn off the electrical power to the unit and verify that all power has been cut. It is also recommended to wear rubber gloves to avoid getting oil and dirt on the new coils. Additionally, ensure that you have all the necessary parts, including a restring kit for each coil and new limit switches.
