HVAC NATE Heat Pump (Questions with 100% correct solutions)

On an R-22 system, line diameters and lengths are typically specified for a vapor pressure drop that does not exceed what? correct answers 6-7PSI or 6F What is the primary purpose of using flux when soldering copper or brass parts? correct answers Prevent Oxidation The water that results from a defrost cycle of an air to air heat pump(runoff) must? correct answers Drain off and away from the outdoor coil. Why must the runoff be drained off and away from the outdoor coil? correct answers Excessive ice can build up on the bottom of the coil and can reduce capacity. What is the component that reduces sound transmission and prevents water leaks of a package heat pump installed on a roof? correct answers Curb Gasket Why do you need to add a control for a heat pump indoor coil that is installed on a fossil fuel furnace? correct answers So the heat pump and furnace do not operate at the same time in normal heating. What happens when you energize a hermetic refrigeration compressor and the system is in a deep vacuum? correct answers Motor windings could become damaged. What needs to happen in order to consider an evacuation to be complete? correct answers System should be evacuated to a vacuum of 500 Microns or below. A system is supplied from the factory with charge for a 15 foot line set. The data plate shows the required system charge to be 5 pounds 10 ounces. The line set uses a 3/8 inch liquid line and is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigerant to be added for each added foot of refrigerant line length. How much refrigerant is needed to completely charge the system? correct answers 6lbs