608 Exam for sure questions

A high-pressure appliance containing less than 200 lbs. of an HCFC or HFC refrigerant must be evacuated to a level of:

0 inches of vacuum

A high-pressure appliance containing less than 210 lbs. of R-407c refrigerant must be evacuated to a level of:

10 inches of vacuum

When removing oil from a low-pressure system, a temp of what must be attained?

130°F

The EPA-required evacuation level for recovery or recycling equipment used on low pressure systems is:

25 mm of Hg absolute

Leaks must be repaired on industrial process and refrigeration units with a 50-pound charge or greater when the annualized leak rate reaches _____ or more.

30%

When charging a low-pressure system, refrigerant should be introduced to the system as a vapor to raise the system's saturation temperature to a minimum of;

36°

What type of equipment can be worked on with Type III certification?

Low pressure

A refrigerant cylinder designed to hold recovered refrigerant had a:

Grey body & Yellow top

The EPA requirement for repairing leaks on small appliances states that:

Leaks should be repaired whenever possible

If a leaking appliance with a regulated refrigerant is not going to be repaired, it must be;

Retrofitted or retired within 12 months

When using a system-dependent recovery system on an appliance that has a non-operating compressor, the technician should;

Run the compressor & recover from the high side of the system only

Which of the following best describes the refrigerant recovery process from an R-123 system?

Start with liquid removal & then switch over to vapor recovery

The use & release of CFCs & HCFCs has a far reaching effect on

The stratosphere

Techs who perform sealed-system service on small appliances must have

Type I or Universal certification

Water must be circulated through the tubes when evacuating refrigerant in order to prevent:

Water from freezing

The chlorine in CFCs and HCFCs;

Will not dissolve in water

Which HC refrigerant is allowed for use in NEW Domestic Small Appliances?

R-600a

The standard for machine room safety is:

ASHRAE-15

A small appliance is defined by the EPA as:

Appliances manufactured, charged, and hermetically sealed in a factory with 5 Lbs or less of refrigerant

Recovery equipment must be

Certified by an EPA-approved testing laboratory.

EPA regulations state that removal of which component constitutes a "major repair"?

Compressor

Before shipping any used refrigerant cylinders, check that the cylinder meets what standards:

Department of Transportation

Disposable cylinders must be:

Discarded

Proper recovery techniques begin with the use of appropriate recovery equipment that has been certified by;

EPA approved laboratory

When a system is in deep vacuum, you should never:

Energize the compressor

To repair a chiller operating with R-22 the technician;

Must have a Type II certification

After the refrigerant has been recovered, which of the following can be used to flush the system?

Nitrogen

After the installation of any type of system, the unit should first be:

Pressurized with an inert gas & leak checked

Which of the following refrigerant has a GWP of "1"?

R-1233zd