EPA 608 (TYPE II) Exam
When a new system has been assembled, the first thing to do is?
Pressurize the system with an inert gas & leak check.
After installation of a field-piped R-410A split heat pulp, the unit should first be?
Pressurized with nitrogen then leak checked.
The EPA regulations require that any appliances containing more than 50 pounds of
refrigerant (except for commercial & industrial process refrigeration) must be repaired
when the leak rate exceeds _________ of the charge per year?
15%
R-410A requires recovery tanks rated for at least?
400 psig
After refrigerant liquid has been recovered from a system, any remaining vapor is?
Condensed by the recovery system.
Your recovery/recycling machine has R-502 refrigerant in it. You now have to recover
refrigerant from a unit with R-22. What must be done before the R-22 refrigerant can be
recovered/recycled?
Recover as much R-502 from the recovery unit as possible, change filter, & evacuate.
In a refrigeration system with a TXV (or other type of throttling device), the component
directly following the condenser is the?
Receiver
When charging an R-410A system that uses a water-cooled condenser, you must first
charge with vapor to a pressure of at least________, before switching to liquid charging.
120 psig
Recovered refrigerant may contain what?
1.) Acids
2.) Moisture
3.) Oils
Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover
refrigerant from a unit with R-410A. What must be done before your recovery unit can
be used to recover R-410A?
1.) The recovery unit must be EPA certified for use with R-410A.
2.) The recovery tank must be designed for the pressure of R-410A.
3.) The filter & lubricant in the recovery unit must be changed, & the recovery unit
evacuated.
To recover liquid refrigerant, you must connect one hose to the?
Liquid Line.
The proper charging method for blended (non-azeotropic) refrigerants (400 Series) is to
use a remove the charge from the cylinder as a?
Liquid
00:0201:17
, Before using a recovery unit to remove a charge, what steps should be taken?
1.) Check service valve positions.
2.) Check the oil level in the recovery unit.
3.) Evacuate recovery unit & recovery tank.
On refrigeration units that use an open compressor; the ________ is most likely to leak
if the unit is not used for several months.
The rotating shaft seal.
Noncondensables in a system cause?
Higher discharge pressure.
Heat Pumps that use R-410A should be leak checked with?
Pressurized Nitrogen.
A reciprocating compressor should not be energized when?
The discharge service valve is closed.
In a refrigeration system, the component directly following the evaporator is the?
Accumulator.
Manifold gauge set hoses should have self-sealing connectors or hand valves to?
Minimize the release of refrigerant when the hoses are connected & disconnected.
The EPA regulations require that leaking commercial or industrial process refrigeration
equipment must be repaired when the leak rate exceeds _____ of the charge per year.
35%
Moisture is removed from a system by?
Using a filter drier.
Oil foaming usually occurs in the?
Compressor
R-410A is different from other ASHRAE 400 series non-azeotropic blends because?
R-410A behaves as a near azeotropic refrigerant, & can be topped off.
With an air-cooled condenser on the roof of a building & the evaporator on the first floor,
recovery should first occur?
From the liquid line entering the evaporator.
A deep vacuum is usually measured in?
Microns.
Heat Pumps that use R-134A should be leak checked with?
Pressurized Nitrogen.
During the evacuation of a system that contains large amounts of moisture it may be
necessary to increase pressure in the system with ________, to counteract the freezing
of the moisture.
Nitrogen.
When under a deep vacuum, the motor winding of a hermetic refrigeration compressor?
Will be damaged if energized.
When using recovery or recycling equipment that was manufactured AFTER November
15, 1993: you must evacuate a system containing MORE than 200 pounds of CFC-12 to
_______ before making a major repair.
15 inches Hg vacuum
When inspecting a system for leaks, you should look for?
When a new system has been assembled, the first thing to do is?
Pressurize the system with an inert gas & leak check.
After installation of a field-piped R-410A split heat pulp, the unit should first be?
Pressurized with nitrogen then leak checked.
The EPA regulations require that any appliances containing more than 50 pounds of
refrigerant (except for commercial & industrial process refrigeration) must be repaired
when the leak rate exceeds _________ of the charge per year?
15%
R-410A requires recovery tanks rated for at least?
400 psig
After refrigerant liquid has been recovered from a system, any remaining vapor is?
Condensed by the recovery system.
Your recovery/recycling machine has R-502 refrigerant in it. You now have to recover
refrigerant from a unit with R-22. What must be done before the R-22 refrigerant can be
recovered/recycled?
Recover as much R-502 from the recovery unit as possible, change filter, & evacuate.
In a refrigeration system with a TXV (or other type of throttling device), the component
directly following the condenser is the?
Receiver
When charging an R-410A system that uses a water-cooled condenser, you must first
charge with vapor to a pressure of at least________, before switching to liquid charging.
120 psig
Recovered refrigerant may contain what?
1.) Acids
2.) Moisture
3.) Oils
Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover
refrigerant from a unit with R-410A. What must be done before your recovery unit can
be used to recover R-410A?
1.) The recovery unit must be EPA certified for use with R-410A.
2.) The recovery tank must be designed for the pressure of R-410A.
3.) The filter & lubricant in the recovery unit must be changed, & the recovery unit
evacuated.
To recover liquid refrigerant, you must connect one hose to the?
Liquid Line.
The proper charging method for blended (non-azeotropic) refrigerants (400 Series) is to
use a remove the charge from the cylinder as a?
Liquid
00:0201:17
, Before using a recovery unit to remove a charge, what steps should be taken?
1.) Check service valve positions.
2.) Check the oil level in the recovery unit.
3.) Evacuate recovery unit & recovery tank.
On refrigeration units that use an open compressor; the ________ is most likely to leak
if the unit is not used for several months.
The rotating shaft seal.
Noncondensables in a system cause?
Higher discharge pressure.
Heat Pumps that use R-410A should be leak checked with?
Pressurized Nitrogen.
A reciprocating compressor should not be energized when?
The discharge service valve is closed.
In a refrigeration system, the component directly following the evaporator is the?
Accumulator.
Manifold gauge set hoses should have self-sealing connectors or hand valves to?
Minimize the release of refrigerant when the hoses are connected & disconnected.
The EPA regulations require that leaking commercial or industrial process refrigeration
equipment must be repaired when the leak rate exceeds _____ of the charge per year.
35%
Moisture is removed from a system by?
Using a filter drier.
Oil foaming usually occurs in the?
Compressor
R-410A is different from other ASHRAE 400 series non-azeotropic blends because?
R-410A behaves as a near azeotropic refrigerant, & can be topped off.
With an air-cooled condenser on the roof of a building & the evaporator on the first floor,
recovery should first occur?
From the liquid line entering the evaporator.
A deep vacuum is usually measured in?
Microns.
Heat Pumps that use R-134A should be leak checked with?
Pressurized Nitrogen.
During the evacuation of a system that contains large amounts of moisture it may be
necessary to increase pressure in the system with ________, to counteract the freezing
of the moisture.
Nitrogen.
When under a deep vacuum, the motor winding of a hermetic refrigeration compressor?
Will be damaged if energized.
When using recovery or recycling equipment that was manufactured AFTER November
15, 1993: you must evacuate a system containing MORE than 200 pounds of CFC-12 to
_______ before making a major repair.
15 inches Hg vacuum
When inspecting a system for leaks, you should look for?
