Hvac Epa Certification Exam Questions And Answers Pdf

"major repair" to EPA {Ans: maintenance, service or repair involving removal of any or all of following: - compressor - condenser - evaporator - heat exchanger coil}piercing type access fitting (process tube) {Ans: sealed systems: - leak tested and solderless on aluminum & copper - not permanent service fixtures}liquid phase recovery {Ans: reduces recovery time}ASHRAE Safety Classification {Ans: Higher flammability A3 - B3 Lower flammability A2 - B2 No Flame propagation A1 - B1 Lower Toxicity Higher Toxicity}Schrader valves {Ans: check valve cores for leaks, bends, & breakage}low-pressure recovery machines {Ans: utilize a water-cooled condenser that is connected to the municipal water supply.}mercury barometer {Ans: - used to measure atmospheric pressure - atmospheric pressure will support a column of mercury 29.92 inches in a sealed tube}Reclaim {Ans: process refrigerant to level equal to new specs}strong odor during recovery {Ans: compressor burn-out has occurred; watch for signs of contamination in the oil}relief valves {Ans: - downstream line from pressure regulator - NOT installed in series}before using recovery unit {Ans: CHECK: - service valve positions - oil level of recovery unit Evacuate and recover remaining refrigerant}system-dependent recovery {Ans: small appliances