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For what refrigerant is an equipment room refrigerant sensor required under ASHRAE standard 15?
A low pressure chiller using CFC-11 as refrigerant has been shut down and has an evaporator pressure of 18.1" Hg. What is the corresponding temperature?
In a refrigeration system utilizing a thermal expansion valve, the component directly following the condenser is the:
Required level of evacuation for recovery equipment manufactured before November 15, 1993, on a system with a CFC-12 charge of less than 200 pounds is:
The MOST IMPORTANT reason why you should NEVER heat a refrigeration container of any kind with an open flame is
Internal hydrostatic pressure may cause the tank to explode, causing serious injury or death
What is the proper method for charging blended refrigerants?
Charge exact weight of liquid refrigerant into the high side of the system
The majority of the liquid to be recovered from a system will be found in the:
System vacuum level is measured with the:
Recovery of refrigerant from a low-pressure system using the "push-pull" method removes what from the chiller?
What is the "push-pull" method?
Recovers large amounts of liquid refrigerant by connecting liquid line system to liquid line recovery and suction line system to suction line tank, and a connection then made from the discharge outlet of recovery unit back to the system.
State the condition of the refrigerant entering the compressor:
When shipping non-flammable compressed gases, DOT requires which of these items to be recorded on the shipping papers?
Number of cylinders of each gas
To work on small appliances after Nov. 14, 1994, technicians must be certified as:
Type I, not Type I and Universal
When using a recovery and recycling equipment BEFORE Nov. 15, 1993, techs must evacuate an appliance containing 10 pounds of CFC-500 to the following level before disposal:
Since when it has been illegal to knowingly release refrigerants during the service, maintenance, repair or disposal of refrigerated appliances:
The most common refrigerant used by low-pressure chillers has been CFC-11. The current replacement for CFC-11 is a HCFC, which is:
The what of refrigeration machines having a refrigerant charge of 50lbs or more must keep records of refrigerant added to each machine.
EPA defines what as an applieance that uses a refrigerant with a boiling point below -50 degrees C at atmos pressure. This definition includes, but not limited to, equipment utilizing CFC-13, R-503:
Very High-Pressure Appliances
The only refrigerant approved by the EPA to be used as a trace gas with nitrogen to test for a leak - except for systems using HFC-134a - is:
What type of refrigerants are R-32, R-125, R-134a, R-143a
What type of refrigerants are R-22, R-123, R-124
What type of refrigerants are R-11, R-12, R-113, R-114, R-115
What is the difference between classification of high-pressure and low-pressure refrigerants?
Boiling point below 50 degrees F are High Pressure. 50 degrees and above are Low Pressure
What is the boiling point of a Very High Pressure Refrigerant?
Very High-Pressure is -50 degrees C
When was the 100 percent ban on production of CFC's?
When was the HCFC freeze at baseline consumption?
When are HCFC's being reduced by 35 percent?
When are HCFC's being reducted by 65 percent, only made for old machines?
When are HCFC's being reduced by 90 percent?
What is the significance of 1/1/20?
Reduction of HCFC production by 99.5 percent.
When will HCFC be reduced by 100 percent?
When was the Montreal Protocol meeting?
When was the CAA Section 608 enacted into law in the U.S.?
When was venting of CFC and HCFC's prohibited legally?
When was venting HFC's made illegal?
What is the replacement for CFC-12? Is it a drop in?
What is one replacement for HCFC-22? Is it a drop in?
Evacuation standards for machines before and after 11/15/1993 for HCFC-22 or component below 200lb?
Evacuation standards for machines before and after 11/15/1993 for HCFC-22 or component over 200lb?
Evacuation standards for machines before and after 11/15/1993 for other high-pressure equipment or component below 200lb?
Evacuation standards for machines before and after 11/15/1993 for other high-pressure equipment or component over 200lb?
Evacuation standards for machines before and after 11/15/1993 for very high-pressure equipment?
Evacuation standards for machines before 11/15/1993 for other low-pressure equipment?
What does ASHRAE Guideline 3-1990 state?
If pressure in system increases 1mm Hg to above 2.5mm Hg during vacuum testing, must leak check system
What are the most common refrigerants found in chiller rooms today?
CFC-11 orange, HCFC-123 light grey, CFC-113 purple
What does ARI-700 require?
Reclaimed refrigerant must be returned to virgin-like state before resale
Name Low-Pressure refrigerants:
CFC-11, 113, and HCFC-123
Name High-Pressure refrigerants:
CFC-12, 114, 500, 502, and HCFC-22
What does ASHRAE 15 require?
Requires oxygen-deprivation sensors and emergency venting in equipment machine rooms for all refrigerants
What does ASHRAE 34 describe?
Standards for Flamability and Toxicity of refrigerants
An average low-pressure chiller requires about 3 pounds of refrigerant per ton. The large amount of liquid refrigerant involved is removed more quickly:
By a special liquid pump from the evaporator into the recovery vessel
HFC-134a is classified as a ________ under ASHRAE 34 safety group.
After isolating a portion of the system that is leaking, what pressure must the isolated portion be brought to before starting a major repair?
The lowest attainable level.
How many valve are in the centrifugal compressor?
What will the evaporator temperature of CFC-11 be at vapor pressure of 13.1psig?
At what temperature will CFC-11 be at under a pressure of 13.1 psig? |
For what refrigerant is an equipment room
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