ESCO HEAT PUMP EMPLOYMENT READY EXAM 190
QUESTIONS & CORRECT ANSWERS LATEST 2025
Some close coupled (package unit) heat pumps use an electronic expansion valve
to meter refrigerant. One advantage to using an electronic expansion valve is;
A. Electronic expansion valves operate at reduced head pressure.
The outdoor coil is frozen solid on a "no heat" service call. The most likely reason
is;
D. None of the above.
When a heat pump is in the heating mode, what can cause frost accumulation on
the outdoor coil when the ambient temperature is 45°F;
A. The outdoor coil is colder than the ambient air in order to absorb heat.
During the defrost cycle, the outdoor fan is usually;
C. Turned off.
Liquid line filter/driers that are used on heat pump systems;
C. Must be a special bi-flow design if used without check valves.
A high efficiency heat pump system designed to function from high to low
ambient conditions below 10° F, may have?
One of the most important devices to insure the longevity of a heat pump's
reciprocating compressor is the;
C. Crankcase heater
(Larger) Heat pump systems which use a thermostatic expansion valve at each coil
will also have;
A. By-pass lines with check valves.
,What is the recommended CFM across the evaporator coil of a heat pump?
B. 400 to 450 CFM.
(What might happen) If the indoor fan is operated at an excessive speed in the
cooling mode;
A. It may not properly remove the humidity from the conditioned space.
When this unit switches to the heat mode, (describe) select the sequence of
events (which will) that take place;
A. The RVR coil is energized through TH-1. The CR coil is energized through the
RVR contacts.
When a heat pump is used for heating and cooling, the system is sized by (to
handle) the;
A. Cooling load.
When operating in the heat mode, hot gas leaves the compressor and first flows
to;
D. The reversing valve.
The use of a scroll type compressor on a heat pump can eliminate the need for a;
C. Suction line accumulator.
As per the diagram above in ques. 11, The DTC motor and cam will close the DTC
N.O. contacts momentarily (approx. 5 seconds). How is the DFR kept energized
when the DTC N.O. contacts open?
C. The DFR No. contacts close, which forms a holding circuit .
,The air-to-air heat pump outdoor unit is most efficient if located;
C. In a moderate climate zone.
During the cooling cycle, the indoor coil becomes;
B. An evaporator.
COP is the abbreviation for;
A. Coefficient of performance.
Mechanically troubleshooting a reversing valve can be done by;
D. Both "A" The pressure difference between the low and high side of the system
& "C" Checking for the correct voltage to the pilot solenoid.
3 multiple choice options
Compressors designed for heat pumps differs from compressors designed for A/C
in that;
Good service practice for installation of a reversing valve includes;
A. Both "B" Do not overheat the new valve body & "C" Use heat paste and wet
rags while brazing in the new valve.
2 multiple choice options
The temperature difference between the 1st and 2nd bulbs for heating on a heat
pump thermostat is;
C. Approximately 2°F.
The heat pump defrost board can be manipulated by the technician to;
C. Simulate the defrost cycle.
When the heat pump compressor has malfunctioned, the customer has the
option to switch the system into;
, B. Emergency heat mode.
The reversing valve is often referred to as a;
C. Four-way valve because of the number of connections.
SEER (rating determine) is calculated by:
A. Heat produced divided by watts consumed during a particular season.
The slide valve and piston in the reversing valve is actuated by pressure directed
through the;
A. Solenoid and pilot valve.
How may a lockout (impedance) relay be reset?
C. Simply disconnect power to the unit momentarily.
What is the industry standard for deep vacuum?
C. Maintain 500 microns for 15 minutes.
When a heat pump is operating in the heat mode, the suction line at the
compressor will feel;
D. Both cold and sweaty.
The customer complaint is not enough heat. You install service gauges and find
the low side pressure is higher than normal and the high side pressure is lower
than normal. You switch the system to the cooling mode and find the pressures
are normal. The most likely cause of the problem is;
A. A stuck open check valve at the outdoor coil.
Which type of heat pump does not require a defrost cycle?
As per the diagram above in ques. 11, How is defrost terminated in this system?
D. Both "B" The defrost thermostat is warm enough to open, normally 55°F or
above & "C" The defrost time clock has opened the circuit after 10 minutes of
defrost.
QUESTIONS & CORRECT ANSWERS LATEST 2025
Some close coupled (package unit) heat pumps use an electronic expansion valve
to meter refrigerant. One advantage to using an electronic expansion valve is;
A. Electronic expansion valves operate at reduced head pressure.
The outdoor coil is frozen solid on a "no heat" service call. The most likely reason
is;
D. None of the above.
When a heat pump is in the heating mode, what can cause frost accumulation on
the outdoor coil when the ambient temperature is 45°F;
A. The outdoor coil is colder than the ambient air in order to absorb heat.
During the defrost cycle, the outdoor fan is usually;
C. Turned off.
Liquid line filter/driers that are used on heat pump systems;
C. Must be a special bi-flow design if used without check valves.
A high efficiency heat pump system designed to function from high to low
ambient conditions below 10° F, may have?
One of the most important devices to insure the longevity of a heat pump's
reciprocating compressor is the;
C. Crankcase heater
(Larger) Heat pump systems which use a thermostatic expansion valve at each coil
will also have;
A. By-pass lines with check valves.
,What is the recommended CFM across the evaporator coil of a heat pump?
B. 400 to 450 CFM.
(What might happen) If the indoor fan is operated at an excessive speed in the
cooling mode;
A. It may not properly remove the humidity from the conditioned space.
When this unit switches to the heat mode, (describe) select the sequence of
events (which will) that take place;
A. The RVR coil is energized through TH-1. The CR coil is energized through the
RVR contacts.
When a heat pump is used for heating and cooling, the system is sized by (to
handle) the;
A. Cooling load.
When operating in the heat mode, hot gas leaves the compressor and first flows
to;
D. The reversing valve.
The use of a scroll type compressor on a heat pump can eliminate the need for a;
C. Suction line accumulator.
As per the diagram above in ques. 11, The DTC motor and cam will close the DTC
N.O. contacts momentarily (approx. 5 seconds). How is the DFR kept energized
when the DTC N.O. contacts open?
C. The DFR No. contacts close, which forms a holding circuit .
,The air-to-air heat pump outdoor unit is most efficient if located;
C. In a moderate climate zone.
During the cooling cycle, the indoor coil becomes;
B. An evaporator.
COP is the abbreviation for;
A. Coefficient of performance.
Mechanically troubleshooting a reversing valve can be done by;
D. Both "A" The pressure difference between the low and high side of the system
& "C" Checking for the correct voltage to the pilot solenoid.
3 multiple choice options
Compressors designed for heat pumps differs from compressors designed for A/C
in that;
Good service practice for installation of a reversing valve includes;
A. Both "B" Do not overheat the new valve body & "C" Use heat paste and wet
rags while brazing in the new valve.
2 multiple choice options
The temperature difference between the 1st and 2nd bulbs for heating on a heat
pump thermostat is;
C. Approximately 2°F.
The heat pump defrost board can be manipulated by the technician to;
C. Simulate the defrost cycle.
When the heat pump compressor has malfunctioned, the customer has the
option to switch the system into;
, B. Emergency heat mode.
The reversing valve is often referred to as a;
C. Four-way valve because of the number of connections.
SEER (rating determine) is calculated by:
A. Heat produced divided by watts consumed during a particular season.
The slide valve and piston in the reversing valve is actuated by pressure directed
through the;
A. Solenoid and pilot valve.
How may a lockout (impedance) relay be reset?
C. Simply disconnect power to the unit momentarily.
What is the industry standard for deep vacuum?
C. Maintain 500 microns for 15 minutes.
When a heat pump is operating in the heat mode, the suction line at the
compressor will feel;
D. Both cold and sweaty.
The customer complaint is not enough heat. You install service gauges and find
the low side pressure is higher than normal and the high side pressure is lower
than normal. You switch the system to the cooling mode and find the pressures
are normal. The most likely cause of the problem is;
A. A stuck open check valve at the outdoor coil.
Which type of heat pump does not require a defrost cycle?
As per the diagram above in ques. 11, How is defrost terminated in this system?
D. Both "B" The defrost thermostat is warm enough to open, normally 55°F or
above & "C" The defrost time clock has opened the circuit after 10 minutes of
defrost.
