| A | B |
|---|
| Determine if the tubes are leaking in the evaporator or condenser are leaking | What is a hydrostatic tube test used for? |
| Check for leaks | According to ASHRAE guidelines 3-1990 if the pressure is a system rises from 1 millimeter of mercury (1 mm Hg) to a level above 2.5mm Hg during a standing vacuum test, you should do what to it? |
| Pressurize it | Under EPA’s regulations, hot water can be used to what on a low-pressure system for opening the system for a non-major leak? |
| The oil inside of the system | Heating the oil before removing it reduces the amount of refrigerant trapped in what? |
| evaporator | A centrifugal chiller’s rupture disk is connected to the chillers what? |
| Evaporator charging valve | Refrigerant is added to a centrifugal machine through which valve? |
| Nitrogen | During evacuation of a system with large amounts of moisture it may be necessary to increase pressure with gas such as what to avoid freezing? |
| Evacuated and vented | If a large leak of refrigerant occurs, such as from a filled cylinder in an enclosed area, and no self-contained breathing apparatus is available, the area should be what? |
| June 14, 1993 | Owner of equipment containing more than 50 pounds of refrigerant with substantial leaks must have such leaks repaired within 30 days after discovery. When was this proposed to the EPA technicians? |
| All service records to the unit | Technicians servicing appliances that contain 50 or more pounds of refrigerant must provide the owner with and invoice that indicates what? |
| A purge unit | Because CFC-11 and HCFC-123 systems operate below atmospheric pressure, system leaks result in air and other contaminates leaking into the system. A device that removes air and other non-condensable gases from the top of the condenser of a centrifugal refrigeration system during operation is called what? |
| Causes it to vent some refrigerant as it vents the non- condensable | On a chiller that operates at pressures below atmospheric pressure, such as R-11 chillers, leaks cause non- condensable gases to enter the system. This causes the purge unit to what? |
| less efficiently | An overcharged system will operate; |
| with charges of 50 or more pounds | The owner must keep records of refrigerant added during service and maintenance on equipment; |
| EPA | a recovery device can meet what standards even if it recovers one type of refrigerant |
| toxic refrigerant | Refrigerant 123 is a what ? |
| all high and low pressure systems | what kind of refrigeration units do type III technicians work on |
| depends on the system | whaat kind of refrigeration do Type III technicians usually use |
| false | TYpe III technicians only work on one type of refrigeration unit |
| Gloves and safty glasses at all times | all technicians are required to wear what |
