Calculate tonnage of heating and cooling equipment needed based on square footage of homes, such as 1 ton for every 1,000 square feet. Find the overall tonnage by factoring several criteria such as number of windows, people in the house, thermal properties of appliances and overall heat gain of the dwelling.
Know the general rule of thumb for newer homes in the United States, which is 1 ton of equipment for every 1,000 square feet of living space. Realize that energy-efficient homes may only need 1 ton for every 2,000 square feet.
Calculate variables that add heat to a home. A human body averages 230 BTUs per hour. The total amount of appliances account for 1,600 BTUs in an hour, and lighting adds another 1,600 BTUH. Houses with more efficient appliances, fewer windows and better lighting do not have as much inside heat. Denote that heating and cooling zones mean different needs based on local climates. Square footage needs for HVAC equipment differs from warmer climates to cooler climates in the United States.
Get assistance from computer programs that help by automating the process. Find programs that follow the "Manual J" method adopted by the Air Conditioning Contractors of America. When calculations are done correctly, the computer program determines a smaller air conditioner is needed than what is normally calculated using a rule of thumb.
A 12-kilowatt generator should be able to power many essential appliances, such as a refrigerator, lights, a water heater and a gas furnace. Determining the amount of power required from a generator during a brief power outage depends on the appliances that are powered.Full Answer >
Learning how to read wiring diagrams is possible through books, magazines or websites dealing with basic electronics or physics. It is also possible to learn how to read them from a class on electronics or an experienced electrician.Full Answer >
A relay switch runs by sending electricity through an electromagnet in order to close or open a secondary circuit. The metal arm of the secondary circuit has a spring that is overpowered by the magnetic attraction created when power flows through the electromagnet. This attraction is what affects the circuit.Full Answer >
To change a circuit breaker, switch off the main circuit breaker, and unscrew the load terminal wire. Remove the old breaker, and reverse the sequence used to remove it to install the new one. Use a voltage tester, a screw driver, and a new circuit breaker to complete this task.Full Answer >