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Re: 10 Gauge Wire connected to a 40amp breaker... Originally Posted by dnasser What does the AC unit label say? Originally Posted by cfoley1 That is correct, there are things like RLA (running load amps) and SLA (starting load amps) on certain appliances such as AC units. Typically the unbit will have a data plate on it that will tell you Max fuse/breaker size. "We Respect Our Clients Right To Privacy" Jim Keilson Certified Master Inspector State of Maryland License# 31141 Maryland Home Inspectors In Gaithersburg, Rockville, Germantown, Bethesda, Potomac, Also All of Northern Virginia and Washington, D.C. A 5 horse power 240 volt single phase motor is wired with #10 wire but protected by a 70 amp breaker Reference 430.22 and 430.52 of the NEC When dealing with AC or heat pumps look at the name plate for MCA and MAX fuse or HARC breaker for the conductor and overcurrent sizes. These units have internal running overload that protects the motor and conductors.

The fuses and breakers are installed for ground fault and short circuit purposes only Originally Posted by jwhittI never knew that. I always assumed, incorrectly, that the panel breaker was there to protect the compressor motor. Can I Install Ductless AC By Myself? My Thermostat Works And The Outside Unit Is Working, But The Inside Unit Won't Blow Air Into The House. What Can I Do A Couple Of The Bedrooms Are Hotter In The Summer Than The Rest Of The House And Colder In The Winter, What Can I Do? I Replaced A Compressor On An Old 1.5 Ton Rheem, The Compressor Won't Come On And Has Power To It How Do I Remove AC Clutch And Pulley From Compressor?How to Use C-manifold Gauges on Home Air Conditioning Air conditioners remove the moisture from the air inside your home in order to cool the residence. If you are having problems with your air conditioner, you can use a C-manifold gauge to check the refrigerant pressure in the system. These gauges give you a reading in pounds per square inch (PSI).

Although you can check the refrigerant pressure yourself, a licensed HVAC technician should ultimately handle the repairs to your AC unit. Turn on the AC unit at the thermostat and allow it to run for about 20 minutes then turn it off. Connect the blue gauge on the C-manifold to the low side service port on the AC unit. The low side is the larger pipe coming out of the unit. Connect the red gauge to the high side service port on the AC unit. The high side is the smaller pipe on the unit. Open the gauges to get the PSI readings on your unit. Write down the pressure readings from the blue and red gauges. If the low side pressure is between 28 and 30 PSI, there should be cool air coming from the vents in the inside of your home. If the air is not cool, consult a licensed HVAC technician to diagnose the problem. Check the high side pressure. This pressure should be around two times the temperature of the air inside the home. For example, if the temperature inside your home is 70 degrees, then the PSI should be around 140.

Consult a licensed HVAC technician if the pressure is higher or lower. Harbor Freight: Gauge Manual (PDF) Read the pressures on both the high- and low-pressure gauges. This reading is the air conditioning ... How to Read the Gauges... How to Use C-manifold Gauges on Home Air Conditioning. Air conditioners remove the moisture from the air inside your home in order... How to Read an R134A Air Conditioning Gauge; The automotive air conditioning manifold gauges are essential for diagnosing problems with... Home Maintenance & Repair; There are telltale signs that your air conditioner system is overcharged with refrigerant. There are a number of different ports on the HVAC gauge set, also known as a manifold, ... How to Hook Up... Capacitors are used in the home for a variety of reasons. There are numerous capacitors present in any electronic device. How to Find the Low-Pressure Side of an AC Unit on a Car. How to Find the Low High Side on... How to Use C-manifold Gauges on Home Air Conditioning;