EPA Type III Questions and Answers

EPA Type III Questions and Answers When charging a chiller, refrigerant vapor is introduced into the system before charging with liquid. This is because: - Answer ️️ -Liquid charged into a deep vacuum will cause the refrigerant to boil and may lower temperature enough to freeze the water in the tubes. A hydrostatic tube test kit is used to: - Answer ️️ -Determine if a tube leaks. A charged low pressure refrigeration system can be efficiently leak checked by: - Answer ️️ - Raising system pressure by heating with circulated hot water or heating blankets. What is meant by the term "high efficiency purge unit"? - Answer ️️ -Those purge units which discharge a low percentage of refrigerant with the air which they remove. On a low pressure chiller with an open type compressor, the _________________ is very susceptible to leaks. - Answer ️️ -Shaft seal. The lowest access point on a low pressure centrifugal air conditioning unit is the: - Answer ️️ - The evaporator charging valve. ASHRAE Standard 15-1994 requires that each machinery room must activate an alarm and mechanical ventilation before refrigerant concentrations exceed: - Answer ️️ -The TLV-TWA (Threshold Limit Value - Time Weighted Average). A typical setting for the high pressure cut out control on a recovery unit used for evacuating the refrigerant from a low pressure chiller is: - Answer ️️ -10 psig. On low pressure chillers, moisture typically enters the refrigerant system through: - Answer ️️ -Air leaks from the areas with gaskets or fittings. Where does refrigerant go after it leaves the purge unit of a low pressure centrifugal system? - Answer ️️ -The evaporator. Which repair WOULD NOT fall under the EPA definition for "MAJOR MAINTENANCE, SERVICE OR REPAIR"? - Answer ️️ -Replacing an oil filter. The primary water source for a recovery unit condensing coil is _____________. - Answer ️️ - Local municipal water supply. After recovering the liquid refrigerant you must: - Answer ️️ -Recover the vapor refrigerant. Refrigerant is added to a centrifugal machine through the: - Answer ️️ -Evaporator charging valve