608 TYPE 1

 Which of the following are recommended safe work practices when recovering refrigerant?

• Wear safety eyewear and blue-lined gloves when connecting/disconnecting hoses

• Wear a respirator when working with any refrigerant.

• 1. Wear cotton gloves when working with any compressed gas.

• Ventilation is only necessary if oil, appearing as a white cloud or fog, is emitted during the recovery procedure.

Which condition can cause excessive pressure on the high side of a self-contained (active0 recovery device?

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  1. When the thermal expansion valve is stuck open.

• 1. When the capacity of the recovery tank is larger than the charge size of the system.

• When there is a large volume of non-condensable gas in the refrigerant being recovered.

• 1. When the system is set for no subcooling.

  
  
  

When R-410A is recovered from an appliance, it; 

• Can be mixed with either R-32 or R-125a during the recovery process, since R-410A is a mixture of those two refrigerants.

• 1. Can be mixed with R-134a but not R-22 during the recovery process.

• 1. Need not be recovered since R-410A is not one of the refrigerants covered by the clean air act.

• 1. Should be recovered into a recovery vessel that is clearly marked to ensure that mixing of refrigerants does not occur.

What is the maximum allowable factory charge of refrigerant for type 1 appliances using CFC’s, HCFC’s, or HFC’s?

• 3 pounds

• 1. 5 pounds

• 10 pounds

• 15 pounds

 Why should low and high side access valves be installed when recovering refrigerant from a household refrigerator?

• To improve the speed of recovery.

• To prevent non-condensables contamination

• 1. To protect the recovery machine

• 1. To prevent oil migration

For which of the following refrigeration systems/appliances would it be permissible to use a passive recovery device for recovery of CFC’s, HCFC’s, and HFC’s?

• 1. A centrifugal air conditioner 

• 1. A reciprocating liquid chiller

• 1. A single compressor, large commercial walk-in freezer

• 1. A domestic refrigerator

When installing any type of access fitting onto a sealed system;

• 1. The fitting should be leak tested before proceeding with recovery.

• 1. It is not necessary to leak test an access fitting.

• 1. The fitting need not be leak tested until the total repair is completed.

• 1. The system must be pressurized with dry nitrogen before leak testing can be attempted.

Which of the following does NOT meet the criteria for type 1 appliance certification?

• 1. An MVAC-like system that holds three pounds of R-12.

• 1. A water cooler that holds 13 ounces of R-22.

• 1. A food freezer that holds 22 ounces of R-134a.

• 1. A dehumidifier that holds seven ounces of R-410a.

When using a self-contained recovery device on a CFC, HCFC, or HFC system with an operating compressor, technicians must;

• 1. recover the refrigerant to 5 inches of mercury vacuum.

• Recover 80% of the nameplate charge

• Recover the refrigerant to both 4 inches of mercury vacuum an 80% of the nameplate charge

• 1. Either recover the refrigerant to 4 inches of mercury vacuum or 90% of the nameplate charge.

  
  

What is the maximum normal charge of HCFC or HFC refrigerant in an appliance that is allowed to use system dependent recovery equipment?

• 5 pounds

• 10 pounds

• 15 pounds

• 50 pounds