HVAC (EPA Certification Exam Section 608)

How many types of HVAC certifications are there? - Answer- There are 4 types. What does a metering device do? - Answer- The metering device causes a reduction in pressure, and therefore a reduction in saturation temperature. What is absorbed in the evaporator? - Answer- Heat is absorbed in the evaporator. What happens in the evaporator? - Answer- Heat is absorbed in the evaporator and causes the refrigerant to boil from liquid to vapor. At the outlet of the evaporator the refrigerant is what? - Answer- The refrigerant is now a low temperature, low pressure vapor. As the refrigerant expels heat, the refrigerant condenses to a what? - Answer- It condenses to a liquid. At the condenser outlet what pressure is the refrigerant? - Answer- The refrigerant is a high pressure liquid. What is a metering device used for? - Answer- The metering device causes a reduction in pressure, and therefore a reduction in saturation temperature. A system that uses a capillary tube or fixed bore metering device is usually equipped with a blank? - Answer- Accumulator which would be located in the suction line directly following the evaporator. A system that uses a thermostatic expansion valve is usually equipped with a what? - Answer- A receiver, which would be located in the liquid line directly following the condenser. The compound gauge is what color? - Answer- Blue. The high pressure gauge is what color? - Answer- Red. The blank measures low pressure (psig) and vacuum (inches Hg.). - Answer- Compound gauge. What does the high pressure gauge measure. - Answer- It measures high side (discharge) pressure. EPA reg