EPA 608 (TYPE II) Exam
A compressor heater is used to? - ANS-Reduce the amount of refrigerant within the lubricating
oil.
A deep vacuum is generally measured in? - ANS-Microns.
A reciprocating compressor need to now not be energized when? - ANS-The discharge provider
valve is closed.
A recuperation machine that makes use of a hermetic compressor will overheat while drawing a
deep vacuum because? - ANS-The motor wishes a float of refrigerant via the compressor to
provide motor cooling.
A routine renovation undertaking which should be executed on refrigerant recycling machines is
to? - ANS-Change clear out & compressor oil (if any).
A device can be evacuated to handiest atmospheric pressure whilst? - ANS-Leaks inside the
equipment make evacuation to the prescribed level unattainable.
After installation of a area-piped R-410A break up warmth pulp, the unit need to first be? -
ANS-Pressurized with nitrogen then leak checked.
After attaining the required vacuum on a gadget you have to? - ANS-Wait to peer if the pressure
rises, indicating that there's nonetheless refrigerant in liquid shape or refrigerant trapped within
the oil.
After refrigerant liquid has been recovered from a gadget, any final vapor is? - ANS-Condensed
by means of the restoration gadget.
An oil sample must be taken when _________. - ANS-The compressor has burned-out.
Before using a restoration unit to do away with a charge, what steps should be taken? - ANS-1.)
Check provider valve positions.
2.) Check the oil stage inside the recovery unit.
Three.) Evacuate healing unit & healing tank.
Before the usage of a healing unit to get rid of a charge, what steps ought to be taken? -
ANS-A.) Check provider valve positions
, B.) Check the oil stage within the recuperation tank.
C.) Evacuate recuperation unit & healing tank.
Dry nitrogen must be used to interrupt the first vacuum while dehydrating by the double
evacuation technique. However, it? - ANS-Can be dangerous if now not used with a strain
regulator.
During the evacuation of a system that consists of big amounts of moisture it could be
necessary to increase strain in the system with ________, to counteract the freezing of the
moisture. - ANS-Nitrogen.
Heat pumps that have been retrofitted from R-22 to R-407C have to be leak checked with? -
ANS-Pressurized nitrogen.
Heat Pumps that use R-134A should be leak checked with? - ANS-Pressurized Nitrogen.
Heat Pumps that use R-410A must be leak checked with? - ANS-Pressurized Nitrogen.
In a refrigeration gadget with a TXV (or other form of throttling device), the thing at once
following the condenser is the? - ANS-Receiver
In a refrigeration gadget, the component at once following the evaporator is the? -
ANS-Accumulator.
In a refrigeration gadget, the component at once following the evaporator is the? -
ANS-Accumulator.
Manifold gauge set hoses ought to have self-sealing connectors or hand valves to? -
ANS-Minimize the discharge of refrigerant when the hoses are connected & disconnected.
Moisture is removed from a gadget by means of? - ANS-Using a filter out drier.
Never use oxygen or compressed air to leak-test hardware due to the fact R-410A can? -
ANS-Explode whilst mixed with air or oxygen.
Noncondensables in a machine motive? - ANS-Higher discharge pressure.
Oil foaming usually happens inside the? - ANS-Compressor
On a high-stress system___________ is a trademark of a probable leak. - ANS-Excessive
superheat.
A compressor heater is used to? - ANS-Reduce the amount of refrigerant within the lubricating
oil.
A deep vacuum is generally measured in? - ANS-Microns.
A reciprocating compressor need to now not be energized when? - ANS-The discharge provider
valve is closed.
A recuperation machine that makes use of a hermetic compressor will overheat while drawing a
deep vacuum because? - ANS-The motor wishes a float of refrigerant via the compressor to
provide motor cooling.
A routine renovation undertaking which should be executed on refrigerant recycling machines is
to? - ANS-Change clear out & compressor oil (if any).
A device can be evacuated to handiest atmospheric pressure whilst? - ANS-Leaks inside the
equipment make evacuation to the prescribed level unattainable.
After installation of a area-piped R-410A break up warmth pulp, the unit need to first be? -
ANS-Pressurized with nitrogen then leak checked.
After attaining the required vacuum on a gadget you have to? - ANS-Wait to peer if the pressure
rises, indicating that there's nonetheless refrigerant in liquid shape or refrigerant trapped within
the oil.
After refrigerant liquid has been recovered from a gadget, any final vapor is? - ANS-Condensed
by means of the restoration gadget.
An oil sample must be taken when _________. - ANS-The compressor has burned-out.
Before using a restoration unit to do away with a charge, what steps should be taken? - ANS-1.)
Check provider valve positions.
2.) Check the oil stage inside the recovery unit.
Three.) Evacuate healing unit & healing tank.
Before the usage of a healing unit to get rid of a charge, what steps ought to be taken? -
ANS-A.) Check provider valve positions
, B.) Check the oil stage within the recuperation tank.
C.) Evacuate recuperation unit & healing tank.
Dry nitrogen must be used to interrupt the first vacuum while dehydrating by the double
evacuation technique. However, it? - ANS-Can be dangerous if now not used with a strain
regulator.
During the evacuation of a system that consists of big amounts of moisture it could be
necessary to increase strain in the system with ________, to counteract the freezing of the
moisture. - ANS-Nitrogen.
Heat pumps that have been retrofitted from R-22 to R-407C have to be leak checked with? -
ANS-Pressurized nitrogen.
Heat Pumps that use R-134A should be leak checked with? - ANS-Pressurized Nitrogen.
Heat Pumps that use R-410A must be leak checked with? - ANS-Pressurized Nitrogen.
In a refrigeration gadget with a TXV (or other form of throttling device), the thing at once
following the condenser is the? - ANS-Receiver
In a refrigeration gadget, the component at once following the evaporator is the? -
ANS-Accumulator.
In a refrigeration gadget, the component at once following the evaporator is the? -
ANS-Accumulator.
Manifold gauge set hoses ought to have self-sealing connectors or hand valves to? -
ANS-Minimize the discharge of refrigerant when the hoses are connected & disconnected.
Moisture is removed from a gadget by means of? - ANS-Using a filter out drier.
Never use oxygen or compressed air to leak-test hardware due to the fact R-410A can? -
ANS-Explode whilst mixed with air or oxygen.
Noncondensables in a machine motive? - ANS-Higher discharge pressure.
Oil foaming usually happens inside the? - ANS-Compressor
On a high-stress system___________ is a trademark of a probable leak. - ANS-Excessive
superheat.
