EPA 608 TYPE 3 TEST ACTUAL EXAM
Moisture can enter a low-pressure chiller from ________. - ANSWER: leaks at
gaskets, fittings or shaft seals
To raise the pressure of a low-pressure refrigeration system for leak checking, you
can ________. - ANSWER: heat the system by circulating hot water, raising the
temperature of the room, or using heating blankets
Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig
could damage the _____________ - ANSWER: rupture disc
What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?
- ANSWER: repair the leak in the system
If an appliance with a significant leak system is to be mothballed, the system must be
______________. - ANSWER: Shut down and the leaking section or the entire system
evacuated to at least 0 psig
When possible, the oil in the chiller should be heated because - ANSWER: less
refrigerant will be soluble and or trapped in the oil at higher temps
The rupture discs on the low pressure chiller and on the recovery tank should relieve
at __________ to prevent damage to the system during refrigerant transfer into or
out of the system - ANSWER: 15 psig
According to the EPA, when all the R- 123 liquid has been removed from an average
350- ton R-123 chiller and the system vapor pressure is 0 psig, the system contains
_____________. - ANSWER: 100 pounds of refrigerant in the system
During vapor recovery from a low pressure chiller _____________ - ANSWER: the
system water pumps, recovery compressor, and recovery condenser water flow
should all be on
Water must be circulated through a chiller during refrigerant evacuation to avoid -
ANSWER: freezing of the water
When charging a chiller refrigerant is first added as a vapor followed by liquid
refrigerant to avoid ____________. - ANSWER: freezing of the water in the chiller
barrels
When charging a low pressure chiller with R- 245ca, first introduce the refrigerant as
a vapor until the pressure is greater than 18 inches Hg vacuum to prevent
______________. - ANSWER: the chiller water from freezing
Moisture can enter a low-pressure chiller from ________. - ANSWER: leaks at
gaskets, fittings or shaft seals
To raise the pressure of a low-pressure refrigeration system for leak checking, you
can ________. - ANSWER: heat the system by circulating hot water, raising the
temperature of the room, or using heating blankets
Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig
could damage the _____________ - ANSWER: rupture disc
What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?
- ANSWER: repair the leak in the system
If an appliance with a significant leak system is to be mothballed, the system must be
______________. - ANSWER: Shut down and the leaking section or the entire system
evacuated to at least 0 psig
When possible, the oil in the chiller should be heated because - ANSWER: less
refrigerant will be soluble and or trapped in the oil at higher temps
The rupture discs on the low pressure chiller and on the recovery tank should relieve
at __________ to prevent damage to the system during refrigerant transfer into or
out of the system - ANSWER: 15 psig
According to the EPA, when all the R- 123 liquid has been removed from an average
350- ton R-123 chiller and the system vapor pressure is 0 psig, the system contains
_____________. - ANSWER: 100 pounds of refrigerant in the system
During vapor recovery from a low pressure chiller _____________ - ANSWER: the
system water pumps, recovery compressor, and recovery condenser water flow
should all be on
Water must be circulated through a chiller during refrigerant evacuation to avoid -
ANSWER: freezing of the water
When charging a chiller refrigerant is first added as a vapor followed by liquid
refrigerant to avoid ____________. - ANSWER: freezing of the water in the chiller
barrels
When charging a low pressure chiller with R- 245ca, first introduce the refrigerant as
a vapor until the pressure is greater than 18 inches Hg vacuum to prevent
______________. - ANSWER: the chiller water from freezing
