HPSV EVALUATION TEST ANSWERS AND
QUESTIONS SET A+
✔✔What is the sub cooling temperature for an R-22 unit with a high side pressure of
260 PSIG, a low side pressure of 68 PSIG, and a liquid line temperature of 90°F - ✔✔B.
30°F
✔✔Why are there more circuits in a heat pump outdoor coil then in an AC condensing
unit outdoor coil? - ✔✔B. The pressure drop in the outdoor coil of a heat pump must be
minimized
✔✔What effect would insufficient voltage or current have on a solenoid valve? - ✔✔D.
The valve will vibrate or chatter
✔✔To properly check in energized compressor circuit the technician should use a multi
meter set for: - ✔✔A. Volts
✔✔If the technician believes that a hermetic Compressor has a permanently open
internal overload protector, the technician should test the compressor while it is: - ✔✔A.
Cool
✔✔Why do some electromechanical type thermostats require connections to both the
hot side and common side of the low-voltage transformer? - ✔✔B. Display lights must
be powered using using both sides of the line
✔✔What kind of energy does the condenser remove from the refrigerant? - ✔✔D.
Sensible and Latent heat
✔✔How does a technician check a compressor motor winding that is suspected of
being grounded to the compressor housing(assume all power to the unit is off and the
compressor wires have been removed from their terminals) - ✔✔C. Check for continuity
between the compressor terminals and ground with an ohmmeter
, ✔✔The coil of a potential relay is connected to which terminals of a single stage
compressor? - ✔✔A. common start terminals
✔✔To properly set a heat anticipator it is necessary to check the: - ✔✔B. Heating
control circuit amperage draw
✔✔What would cause a voltage reading across a closed contact in a 24 V control
circuit? - ✔✔C. Pitted or dirty contacts
✔✔A technician finds a compressor contactor energized, but the compressor is not
running. To troubleshoot, the technician should check the proper: - ✔✔A. Voltage to the
load
✔✔A heat pump operates normally in first stage heating. The first and second stages
appear to be calling, the single stage compressor continues to run, but the auxiliary
electric heat does not come on. Which of the following should be included as a likely
source of the problem? - ✔✔D. The outdoor thermostat is closed
✔✔A residential supply diffuser that is noisy because of a loose vane is best serviced
by: - ✔✔D. Replacing the diffuser
✔✔The coefficient of performance (COP) of a heat pump is: - ✔✔B. It's heat output in
watts divided by its total electrical input in watts
✔✔What best describes an extended Plenum duct system? - ✔✔B. A single sized trunk
extending in one or two directions with many branch ducts
✔✔ With an R-410A condensing pressure of 395 psig and a liquid line temperature of
108°F what is the sub cooling temperature? - ✔✔D. 8°F
✔✔When performing maintenance on a heat pump the technician should check the
outdoor fan to be certain: - ✔✔C. The fan runs freely without binding or vibrations
✔✔The continuity of a fuse in a disconnect should be tested by checking resistance: -
✔✔A. With power off
✔✔Why does the outdoor fan on a heat pump stopped during defrost? - ✔✔C. Minimize
defrost time
✔✔It technician measures the return air temperature of 100,000 BTU output furnace to
be 65°F and the supply side air temperature is 135°F. what is the SCFM(standard
CFM)? - ✔✔B. 1323 SCFM
QUESTIONS SET A+
✔✔What is the sub cooling temperature for an R-22 unit with a high side pressure of
260 PSIG, a low side pressure of 68 PSIG, and a liquid line temperature of 90°F - ✔✔B.
30°F
✔✔Why are there more circuits in a heat pump outdoor coil then in an AC condensing
unit outdoor coil? - ✔✔B. The pressure drop in the outdoor coil of a heat pump must be
minimized
✔✔What effect would insufficient voltage or current have on a solenoid valve? - ✔✔D.
The valve will vibrate or chatter
✔✔To properly check in energized compressor circuit the technician should use a multi
meter set for: - ✔✔A. Volts
✔✔If the technician believes that a hermetic Compressor has a permanently open
internal overload protector, the technician should test the compressor while it is: - ✔✔A.
Cool
✔✔Why do some electromechanical type thermostats require connections to both the
hot side and common side of the low-voltage transformer? - ✔✔B. Display lights must
be powered using using both sides of the line
✔✔What kind of energy does the condenser remove from the refrigerant? - ✔✔D.
Sensible and Latent heat
✔✔How does a technician check a compressor motor winding that is suspected of
being grounded to the compressor housing(assume all power to the unit is off and the
compressor wires have been removed from their terminals) - ✔✔C. Check for continuity
between the compressor terminals and ground with an ohmmeter
, ✔✔The coil of a potential relay is connected to which terminals of a single stage
compressor? - ✔✔A. common start terminals
✔✔To properly set a heat anticipator it is necessary to check the: - ✔✔B. Heating
control circuit amperage draw
✔✔What would cause a voltage reading across a closed contact in a 24 V control
circuit? - ✔✔C. Pitted or dirty contacts
✔✔A technician finds a compressor contactor energized, but the compressor is not
running. To troubleshoot, the technician should check the proper: - ✔✔A. Voltage to the
load
✔✔A heat pump operates normally in first stage heating. The first and second stages
appear to be calling, the single stage compressor continues to run, but the auxiliary
electric heat does not come on. Which of the following should be included as a likely
source of the problem? - ✔✔D. The outdoor thermostat is closed
✔✔A residential supply diffuser that is noisy because of a loose vane is best serviced
by: - ✔✔D. Replacing the diffuser
✔✔The coefficient of performance (COP) of a heat pump is: - ✔✔B. It's heat output in
watts divided by its total electrical input in watts
✔✔What best describes an extended Plenum duct system? - ✔✔B. A single sized trunk
extending in one or two directions with many branch ducts
✔✔ With an R-410A condensing pressure of 395 psig and a liquid line temperature of
108°F what is the sub cooling temperature? - ✔✔D. 8°F
✔✔When performing maintenance on a heat pump the technician should check the
outdoor fan to be certain: - ✔✔C. The fan runs freely without binding or vibrations
✔✔The continuity of a fuse in a disconnect should be tested by checking resistance: -
✔✔A. With power off
✔✔Why does the outdoor fan on a heat pump stopped during defrost? - ✔✔C. Minimize
defrost time
✔✔It technician measures the return air temperature of 100,000 BTU output furnace to
be 65°F and the supply side air temperature is 135°F. what is the SCFM(standard
CFM)? - ✔✔B. 1323 SCFM
