Epa 608 Test Answers Pdf

If switching from recovering one refrigerant to another, what three steps must be taken before recovering the new refrigerant? What if the refrigerant is R-134A? {Ans: Purge the recover/recycle equipment by recovering as much of the first refrigerant as possible. Change the filter. Evacuate. Use special set of hoses for R-134A}What are three visible ways to check for leaks in a low pressure system? {Ans: Excessive running of a purge system, continuous excessive moisture in the purge unit could indicate a leak in the condenser or the chiller barrel, high lead pressure.}What is a receiver? Where is it located and what is the state of the refrigerant after leaving the receiver? {Ans: Systems using thermal expansion valves will have a receiver/tank on the outlet side of the condenser, designed to hold liquid refrigerant. When leaving the condenser directly or the receiver, the refrigerant remains a high pressure/high temperature liquid until it goes to the metering device.}What common contaminants can be found in refrigerant oils? {Ans: Acids, moisture, and oil}What maintenance task should you take to help limit the damage of contaminated oils? {Ans: Check both the oil and filter on a refrigerant recycling machine as