ICE Exam Study ACR249-02 exam Verified
Questions and Correct Answers
What device is used to prevent refrigerant migration to the compressor during
the off cycle? - ANSWER>>Crankcase Heater
What is the purpose of a suction line accumulator? - ANSWER>>Prevents liquid
refrigerant from entering the compressor
Electric resistance heaters operate more efficiently than a heat pump -
ANSWER>>False
What are the 4 basic types of heat pumps? - ANSWER>>Air-Air
Water-water
water-air
ground-air
A heat pump can provide both _____ and _____ by moving heat with refrigerant.
- ANSWER>>Heating and cooling
The electrical windings of a single phase compressor may be checked with an
ohmmeter, which of the following would provide the highest reading? -
ANSWER>>Run to start
When using the manifold gauge set the compound gauge must... -
ANSWER>>Never be connected to the high side of the system
Water to water heat pumps use less electricity than the other systems when they
are properly maintained - ANSWER>>False
Air to air systems are the most popular type of heat pump - ANSWER>>True
,A compressor has been off all winter, upon checking it you find it is warm. This is
most likely because... - ANSWER>>the crankcase heater is on
Auxiliary heat strips are used on heat pumps to aid the system when the outdoor
temp drops below the balance point. - ANSWER>>True
Solid state defrost is one of the most popular methods of defrost initiation and
termination. - ANSWER>>True
Absolute zero on the kelvin scale is... - ANSWER>>-459 degree Fahrenheit
What is used to bring heat from the source to the building? -
ANSWER>>Refrigerant
What device reverses refrigerant flow? - ANSWER>>Reversing valve
What type of heat pump is most efficient? - ANSWER>>Water to water
What are the 2 ways of rating heat pump efficiency? - ANSWER>>COP and SEER
What are the 2 most popular defrost control systems? - ANSWER>>Time/Temp
and solid state
The basic concept of a heat pump is to ____ the refrigerant flow from cooling and
heating modes. - ANSWER>>Reverse
During the off cycle, what does the compressor pump into? - ANSWER>>Outdoor
coil
During the heating cycle, which coil does the compressor pump refrigerant from?
- ANSWER>>Outdoor coil
, What is the last component in the system refrigerant enters before entering the
compressor? - ANSWER>>Suction line accumulator
What components direct the refrigerant around the flow control device(s) used
ion a heat pump? - ANSWER>>Check valve
What is the purpose of the defrost cycle on a heat pump system? -
ANSWER>>Remove frost build up
In the heat pump heating mode, a dirty filter can result in: - ANSWER>>Excessive
head pressure
In comparison to the ON cycles of conventional hot air heating equipment, the ON
cycles of the heat pump during the heating mode are: - ANSWER>>About the
same
Across a suction line drier, how much pressure drop dictates changing the drier -
ANSWER>>3 psig
Which of the following is likely to cause flooding of the evaporator coil on a
system that is using a capillary tube metering device - ANSWER>>An evaporator
with low air flow
In a refrigeration system, the presence of air is indicated by... - ANSWER>>High
head and normal suction pressures
Through what component(s) is the direction of refrigerant vapor flow reversed
when the cycle is reversed from heating and cooling in a heat pump installation? -
ANSWER>>The evaporator and condenser
What component must always be de-energized during the defrost cycle? -
ANSWER>>The outdoor fan
Questions and Correct Answers
What device is used to prevent refrigerant migration to the compressor during
the off cycle? - ANSWER>>Crankcase Heater
What is the purpose of a suction line accumulator? - ANSWER>>Prevents liquid
refrigerant from entering the compressor
Electric resistance heaters operate more efficiently than a heat pump -
ANSWER>>False
What are the 4 basic types of heat pumps? - ANSWER>>Air-Air
Water-water
water-air
ground-air
A heat pump can provide both _____ and _____ by moving heat with refrigerant.
- ANSWER>>Heating and cooling
The electrical windings of a single phase compressor may be checked with an
ohmmeter, which of the following would provide the highest reading? -
ANSWER>>Run to start
When using the manifold gauge set the compound gauge must... -
ANSWER>>Never be connected to the high side of the system
Water to water heat pumps use less electricity than the other systems when they
are properly maintained - ANSWER>>False
Air to air systems are the most popular type of heat pump - ANSWER>>True
,A compressor has been off all winter, upon checking it you find it is warm. This is
most likely because... - ANSWER>>the crankcase heater is on
Auxiliary heat strips are used on heat pumps to aid the system when the outdoor
temp drops below the balance point. - ANSWER>>True
Solid state defrost is one of the most popular methods of defrost initiation and
termination. - ANSWER>>True
Absolute zero on the kelvin scale is... - ANSWER>>-459 degree Fahrenheit
What is used to bring heat from the source to the building? -
ANSWER>>Refrigerant
What device reverses refrigerant flow? - ANSWER>>Reversing valve
What type of heat pump is most efficient? - ANSWER>>Water to water
What are the 2 ways of rating heat pump efficiency? - ANSWER>>COP and SEER
What are the 2 most popular defrost control systems? - ANSWER>>Time/Temp
and solid state
The basic concept of a heat pump is to ____ the refrigerant flow from cooling and
heating modes. - ANSWER>>Reverse
During the off cycle, what does the compressor pump into? - ANSWER>>Outdoor
coil
During the heating cycle, which coil does the compressor pump refrigerant from?
- ANSWER>>Outdoor coil
, What is the last component in the system refrigerant enters before entering the
compressor? - ANSWER>>Suction line accumulator
What components direct the refrigerant around the flow control device(s) used
ion a heat pump? - ANSWER>>Check valve
What is the purpose of the defrost cycle on a heat pump system? -
ANSWER>>Remove frost build up
In the heat pump heating mode, a dirty filter can result in: - ANSWER>>Excessive
head pressure
In comparison to the ON cycles of conventional hot air heating equipment, the ON
cycles of the heat pump during the heating mode are: - ANSWER>>About the
same
Across a suction line drier, how much pressure drop dictates changing the drier -
ANSWER>>3 psig
Which of the following is likely to cause flooding of the evaporator coil on a
system that is using a capillary tube metering device - ANSWER>>An evaporator
with low air flow
In a refrigeration system, the presence of air is indicated by... - ANSWER>>High
head and normal suction pressures
Through what component(s) is the direction of refrigerant vapor flow reversed
when the cycle is reversed from heating and cooling in a heat pump installation? -
ANSWER>>The evaporator and condenser
What component must always be de-energized during the defrost cycle? -
ANSWER>>The outdoor fan
