HVAC: EPA 608 Certification Study Guide Updated 2025 with complete solution
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Course
HVAC: EPA 608 Certification
Institution
HVAC: EPA 608 Certification
Recover - to remove any refrigerant in any condition from system and store in external container
without necessarily testing or processing in any way
What are the leak repair requirements for comfort cooling appliances and commercial appliances
containing 50 pounds or more of refrigerant? - The ...
HVAC: EPA 608 Certification Study
Guide
Recover - to remove any refrigerant in any condition from system and store in external container
without necessarily testing or processing in any way
What are the leak repair requirements for comfort cooling appliances and commercial appliances
containing 50 pounds or more of refrigerant? - The leak rate exceeds 15% in comfort cooling
appliances
How does a centrifugal purge unit work? - A centrifugal purge unit takes its suction from the top
of the condenser, removes the air from the system, and returns the refrigerant to the evaporator.
Does refrigerant go out of the system in low pressure or does air and moisture go in? Why? - A
low-pressure system operates in a vacuum (below atmospheric pressure) to enter the refrigeration
system.
ASHRAE Standard 15-1994 - Requires refrigerant sensor that will sound alarm and automatically
start ventilation system in occupied equipment rooms where refrigerant from leak will concentrate
At what point in the system should you charge a low pressure system and what should you start the
charge with? - Charge through the evaporator charging valve as this is the lowest point on a low
pressure system. First charge the system with vapor until the refrigeration saturation temperature
reaches 36 degrees F or the vapor pressure reaches 16.9" Hg vacuum
Bubble Point - Occurs when saturation temp in condenser changes refrigerant from vapor to liquid
Compound Gauge - Typically blue and measures low pressure (psig) and vacuum (inHg).
Compressor - Takes low pressure, low temp vapor and changes it to a high-temp, high-pressure,
superheated vapor and delivers it to the condenser
, Condenser - Rejects heat from system and changes refrigerant from high-temp, high-pressure
vapor into high-pressure, high-temp liquid
Describe two ways to speed up recovery - Pack the recovery cylinder in ice and/or apply heat to
the appliance. Recover as much as possible in the liquid phase.
Dew Point - Occurs when saturation temp in evaporator causes refrigerant to change from liquid
to vapor
Evaporator - Absorbs heat into system from space to be cooled. Absorption of heat causes
refrigerant to boil. Upon leaving, refrigerant changed to low pressure, low temperature vapor
Find pressure for R-22 at 70 degree F. - 121.4 psi
Find the pressure for R-12 at 80 degrees F. - 84.4 psi
Foaming at start-up may be found in what component? What does this mean? - Refrigerant in the
oil will cause oil foaming in the compressor at start-up
High Pressure Gauge - Red and measures high side (discharge) pressure. 0 to 500 psi
How can you check if a tank contains excess air or non-condensables? - Check pressure inside
recovery tank after allowing temp of cylinder to stabilize to room temperature
After removal of liquid, about how much vapor will remain in the system on a 350 ton R-11 chiller? -
100lbs
How can you release trapped refrigerants in the oil? - Necessary to heat and tap compressor with
mallet several times or use vacuum pump
How can you speed up the vapor recovery process on Type III systems? - A heater on the recovery
vessel side will help evacuate the vapor faster
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