HPSV CORRECT EXAMS ANSWERS AND QUESTIONS
SET A+
✔✔Reversing valves for heat pumps are typically manufactured with four refrigerant
circuit tubes brazed to the body of the valve. One of the tubes is brazed to one side of
the body and three tubes are brazed to the opposite side. To which part of the heat
pump refrigerant circuit is the single tube connected? - ✔✔C. The discharge line of the
compressor
✔✔The voltage most often used to power the outdoor unit in a residential system is: -
✔✔B. 240 V single phase
✔✔Liquid line flash gas can be caused by which of the following? - ✔✔A. Excessive
liquid line length or lift
✔✔According to fire protection codes when should fire dampers be used? - ✔✔C. In
any air duct that passes through all assemblies of a light commercial installation
✔✔What does a test of the compressor mineral oil after a burn out indicate? - ✔✔A.
Acidity
✔✔An electronica leak detector can typically detect a leak rate as small as? - ✔✔D. Half
an ounce per year
✔✔When wiring a 20 amp (FLA ) motor, The minimum circuit ampacity (MCA) should
be: - ✔✔C. 25 amps
✔✔Electronica air cleaners can operate with internal voltages as high as: - ✔✔D. 5000
V
✔✔In an economizer system, when the outdoor air enthalpy exceeds set point, the
outdoor air damper: - ✔✔A. Closes to a preset minimum position
, ✔✔Thermostatic expansion valves meter refrigerant flow to a coil to maintain - ✔✔A.
Super heated refrigerant leaving the coil
✔✔The purpose of a sequencer in an auxiliary 20 KW electric heater is to energize: -
✔✔B. One or two heating elements and the blower motor simultaneously, followed by
remaining elements in timed intervals
✔✔What is the purpose of an auto change over system switch on a heat pump
thermostat? - ✔✔D. To automatically switch between heating and cooling as the load
changes
✔✔Which of the following is the sensible heat ratio? - ✔✔A. Sensible heat removed
divided by total heat removed
✔✔According to manufacturers recommendations the most acceptable method for
connecting a line set to an evaporator coil is: - ✔✔D. Use only brazing alloys
✔✔A disc type pressure switch which is located in a liquid line and opens on fall
protects from? - ✔✔C. loss of charge
✔✔A wet bulb reading that is very close to the dry bulb reading from the same
instrument indicates: - ✔✔B. The relative humidity is very high
✔✔What three things happen when I heat pump is cycled into its defrost mode? - ✔✔B.
Reversing valve switches to the cooling mode, the outdoor fan is shut off and auxiliary
heat is energized
✔✔A high pressure limit control, used to shut down a compressor if condensing
pressure becomes excessive, is typically installed to sense: - ✔✔C. Compressor
discharge line pressure
✔✔When the load on a heat pump in the cooling mode decreases, suction pressure
goes: - ✔✔C. Up and discharge pressure goes down
✔✔Bent vanes on a direct Drive blower wheel in an air handler can cause: - ✔✔D. Loss
in airflow, excessive blower motor where, and increased noise
✔✔When selecting a high efficiency filter, which of the following criteria should be used
to maintain proper airflow? - ✔✔D. Maintain face velocity less than 100 ft./min.
✔✔What is used to measure duct static pressure? - ✔✔D. Differential pressure gauge
SET A+
✔✔Reversing valves for heat pumps are typically manufactured with four refrigerant
circuit tubes brazed to the body of the valve. One of the tubes is brazed to one side of
the body and three tubes are brazed to the opposite side. To which part of the heat
pump refrigerant circuit is the single tube connected? - ✔✔C. The discharge line of the
compressor
✔✔The voltage most often used to power the outdoor unit in a residential system is: -
✔✔B. 240 V single phase
✔✔Liquid line flash gas can be caused by which of the following? - ✔✔A. Excessive
liquid line length or lift
✔✔According to fire protection codes when should fire dampers be used? - ✔✔C. In
any air duct that passes through all assemblies of a light commercial installation
✔✔What does a test of the compressor mineral oil after a burn out indicate? - ✔✔A.
Acidity
✔✔An electronica leak detector can typically detect a leak rate as small as? - ✔✔D. Half
an ounce per year
✔✔When wiring a 20 amp (FLA ) motor, The minimum circuit ampacity (MCA) should
be: - ✔✔C. 25 amps
✔✔Electronica air cleaners can operate with internal voltages as high as: - ✔✔D. 5000
V
✔✔In an economizer system, when the outdoor air enthalpy exceeds set point, the
outdoor air damper: - ✔✔A. Closes to a preset minimum position
, ✔✔Thermostatic expansion valves meter refrigerant flow to a coil to maintain - ✔✔A.
Super heated refrigerant leaving the coil
✔✔The purpose of a sequencer in an auxiliary 20 KW electric heater is to energize: -
✔✔B. One or two heating elements and the blower motor simultaneously, followed by
remaining elements in timed intervals
✔✔What is the purpose of an auto change over system switch on a heat pump
thermostat? - ✔✔D. To automatically switch between heating and cooling as the load
changes
✔✔Which of the following is the sensible heat ratio? - ✔✔A. Sensible heat removed
divided by total heat removed
✔✔According to manufacturers recommendations the most acceptable method for
connecting a line set to an evaporator coil is: - ✔✔D. Use only brazing alloys
✔✔A disc type pressure switch which is located in a liquid line and opens on fall
protects from? - ✔✔C. loss of charge
✔✔A wet bulb reading that is very close to the dry bulb reading from the same
instrument indicates: - ✔✔B. The relative humidity is very high
✔✔What three things happen when I heat pump is cycled into its defrost mode? - ✔✔B.
Reversing valve switches to the cooling mode, the outdoor fan is shut off and auxiliary
heat is energized
✔✔A high pressure limit control, used to shut down a compressor if condensing
pressure becomes excessive, is typically installed to sense: - ✔✔C. Compressor
discharge line pressure
✔✔When the load on a heat pump in the cooling mode decreases, suction pressure
goes: - ✔✔C. Up and discharge pressure goes down
✔✔Bent vanes on a direct Drive blower wheel in an air handler can cause: - ✔✔D. Loss
in airflow, excessive blower motor where, and increased noise
✔✔When selecting a high efficiency filter, which of the following criteria should be used
to maintain proper airflow? - ✔✔D. Maintain face velocity less than 100 ft./min.
✔✔What is used to measure duct static pressure? - ✔✔D. Differential pressure gauge
