One of my HVAC Units Quit Working
Repairing an HVAC Unit that Quit Working: Replacing HVAC Electrical Parts and System Components, Causes of a Melted Electrical Wire on a HVAC Unit.
Electrical Repairs for an HVAC Unit
Electrical Question: One of my HVAC units quit working.
- I checked inside the outside unit and found the relay and found it melted, and the white wire going to the relay also had the insulation melted.
- Then I checked the max amperage rating listed on the unit, it showed 25 amps.
- The breaker at the disconnect is 60 amps. Why would they do this?
- I just now ordered a replacement internal breaker and installed a 30 amp breaker at the disconnect. Is that Okay?
- Also, please let me know if I should match the disconnect breaker on the other unit with what is labeled on that unit.
This electrical wiring question came from Jim, in Somerville, Alabama.
Additional Comments: Incredibly awesome, wish I had found it many years ago. Thanks!
Thanks for your electrical wiring question Jim.
Repairing an HVAC Unit that Quit Working
Application: Replacing Electrical Parts for a HVAC Heating Ventilation and Air Conditioning.
Skill Level: Beginner to Intermediate – Best performed by a trained HVAC Service Technician.
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
Estimated Time: Depends on personal level experience and ability to work with tools.
Precaution: Identify the HVAC circuit at the electrical panel, turn it OFF and Tag it with a Note before working with the wiring and electrical components. Record the wiring connections before removing any wiring connections.
Repairs for a HVAC Unit
- Replacing HVAC Electrical Parts and System Components
The replacement components, relay and circuit breaker should have the same specifications as the original equipment as originally specified by the furnace manufacturer.
- Causes of a Melted Electrical Wire on a HVAC Unit
A loose or incorrect wire connection can cause a wire arc and over heat to the point of melting the insulation on the wire. An incorrect wire gauge size and type of insulation can also case a wire to overheat which can damage the insulation.
- HVAC Condenser Motor and Refrigerant Compressor
All the HVAC system components should be tested for normal operation within the specifications found on the HVAC unit specifications and individual electric component labels. Faulty system components can cause abnormal operation which can cause overheated conditions and circuit overloading of the electrical circuit
- HVAC Unit Specifications
Not all HVAC units are alike, so it is essential that the electrical specifications are identified from either the equipment label or the manufacturers installation or owners manual. If it is found that the HVAC system components have been altered outside of the original specifications then restoring the system to it’s original state is recommended.
More about Electrical Motor Control Relays
HVAC Control Relays
The use of relays that are sometimes needed to control special device loads such as Air Conditioners and other high demand equipment from starting at the same time.
Residential Electrical Circuit Breakers
Home Electrical Circuit Breakers
A guide to home electrical circuit breakers and how they work to protect your electrical wiring. When properly installed, your home electrical wiring is protected by a circuit protection device.
Guide to Residential Electrical Wire
Electrical Wire for the Home
Complete listing of electrical wire types and parts used for home projects with electrical code information serves as selection guidelines.
The following may also be helpful for you:
Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
The Safest Way to Test Electrical Devices and Identify Electric Wires!The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.
The Quickest Way to Check for Faulty Electrical Wiring!The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.
Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..
The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.
|More articles about Air Conditioner, Electrical Wiring and Home Electrical Wiring:|
|« Previous||Next »|
|How To Fix Light Fixtures||How to Wire Electrical Circuits for a Kitchen|