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