NATE heat pump exam Questions with 100% Correct Answers | Updated | Download to score A+

1. R-22 vapor line diameters and lengths are typically specified for a vapor pressure drop that does not exceed ANS 6-7 psi or 6 degress F 2. The primary purpose of using flux when soldering copper or brass parts is to prevent ANS Oxidation 3. The water that results from a defrost cycle of an air to air heat pump (runoff) must drain off and away from the outdoor coil to prevent ANS Excessive ice build up 4. The component used to reduce sound transmission and prevent water leaks of a packaged heat pump installed on a roof is the ANS Curb gasket 5. When under a deep vacuum, a hermetic refrigeration compressor's motor windings could be if energized ANS Damaged 6. In order for an evacuation to be considered complete, a heat pump refriger- ant circuit should be evacuated to a vacuum pressure of ANS 500 microns or below 7. 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 so the total refrigerant charge for the system would be ANS 6 lbs(25-15=10 10x0.6=6oz 6oz+5lbs 10oz= 5lbs 16oz the equilvalent of 6lbs)