| A | B |
|---|
| The evaporator is a heat transfer component that accepts ______________ liquid and boils it. | low-temperature-low pressure |
| When the evaporator accepts the liquid and boils it, the liquid is ____________ and has been forced through a small orifice or metering device. | low-temperature, high-pressure |
| The liquid refrigerant is converted to a __________ vapor. | low-temperature, low-pressure |
| The tubing connecting the intake of the compressor to the evaporator is called a _________. | suction line |
| The outlet of the compressor is connected to a ________. | condenser |
| The condenser takes in __________ vapor from the compressor and cools it. | high-temperature, high pressure |
| The condenser changes the vapor to a ______ liquid at the condenser outlet | low-temperature-high pressure |
| On the manifold gauge,a __________ gauge is on the right, and is usually _______ in color | high pressure, red |
| On the manifold guage, a __________ gauge is usually on the left and is _______ in color. | low pressure, blue |
| Liquid refrigerant can migrate to a compressor crankcase if the compressor is the ________ location in the circuit. | coldest |
| Low temperature means lower pressure will cause refrigerant migration because of a difference in _______. | vapor pressure |
| Compressors should never be __________ while they are in a deep vaccum. | started (energized) |
| Compressors should never be started when their service valves (discharge or suction) are ________. | closed |
| Operating in a deep vacuum could cause damage to the compressor's ________. | windings |
| Refrigerant lines can contain contaminated oil which must be _______ from the system. | flushed |
| Flushing the lines with pure refrigerant is ______ a recommended practice. | NOT |
| Before flushing the system, an _________ should be taken if the unit has had a leak or major component failure. (ex.compression burnout) | oil sample |
| To conserve refrigerant supplies, _______ and ___________ leaks. | find, repair |
| To conserve refrigerator supplies, _________ and _______ refrigerants. | recover,recycle |
| A _________ is used to evacuate all moisture and non-condensables. | vacuum pump |
| If a system is pulled below its recommended level of pressure, _________ will be done. | No damage |
| If a system is not evacuated fully, compressor head pressure can rise and the remaining moisture will combine under heat to form acids that are _________. | hydrofluoric, hydrochloric |
| The speed of an evacuation depends on the _______ of the equipment. | size |
| The speed of an evacuation depends also on the __________. | ambient temperature |
| The speed of evacuating a system depends on the __________. | suction line size |
| Increasing the temperature on the tubing and components _________ the dehydration of the system. | speeds up |
| A ________ vacuum pump will dramatically reduce emissions, pressure drop, and evacuation/dehydration time. | high capacity |
| ___________ hoses will reduce emissions, pressure drop, and evacuation/dehydration time greatly. | Short, large diameter |
| The hose________should be the size of the vacuum pump inlet connection or larger. | diameter |
| One chlorine atom can destroy _______ ozone molecules. | 100,000 |
| The ability of any chemical to deplete the ozone is called its ___________. | ODP (Ozone depletion potential) |
| An _________ is a mixture of two or more compounds where the mixture behaves like a single chemical. (new refrigerant) | azeotrope |
| HFC _________ is a hydrofluorocarbon. | 134a |
| HFC's contain _______, _____, and ____. | hydrogen, fluorine, and carbon |
| The ODP of HFC 134a is _____. | zero |
| HFC's will _____ damage the ozone in the stratoshphere. | NOT |
| A manifold gauge set is used to _________ within a refrigeration system.. | check and set pressures |
| The low side gauge is is a compound gauge capable of reading both _____________. | pressures above and below atmospheric pressure |
| For readings above atmospheric pressures, the low pressure gauge reads in _____________. | "pounds per square inch (PSIG)" |
| For readings below atmospheric pressure, the gauge reads in ____________. | "inches of mercury (in. Hg.)" |
| The high side gauge is typically calibrated to read pressures from ___________. | 0 to 500 PSIG |
| The center port of the manifold is used during the _____________. | evacuation, charging, and recovery procedures |
