HPSV TIPS SETS ANSWERS AND QUESTIONS SET A+
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
✔✔The following measurements are recorded on an operating heat pump system. The
heat pump is operating with the compressor only with no auxiliary heat.
-heat pump only supply air temperature 92°F, heat pump only return air temperature
70°F, outdoor temperature 54°F, supply air temp./Auxiliary heat on 115°F, return air
temp./Auxiliary heat on 70°F, CFM 1228
What is the heating capacity of the unit in BTU/H? - ✔✔D. 29,177 btu/h
✔✔R-410A Vapor in line diameters with links 50 feet or less are typically specified for a
vapor pressure drop that does not exceed what value? - ✔✔B. 3 psi
✔✔Which of the following is used to make accurate residential loan calculations? -
✔✔B. ACCA manual J
✔✔The following conditions exist in a circuit that supplies power to three parallel loads:
One load is resistive, one load is capacitive, one load is inductive
, The total current in the circuit when operating will be: - ✔✔D. The sum of the currents
through each load
✔✔what condition can cause a reduction from design capacity in a heat pump? - ✔✔A.
An undersized vapor line
✔✔What can happen if defrost runoff is not properly drained away? - ✔✔B. Ice can
build up on the bottom of the coil
✔✔Undersized ductwork often cause: - ✔✔C. High air quantities and high static
pressures
✔✔Where is the sensor of an outdoor ambient thermostat for a heat pump system
typically installed? - ✔✔C. In the entering airstream to the outdoor coil
✔✔What effect does a low charge have on the switch over operations of a reversing
valve? - ✔✔C. Reversing valves are less likely to shift if charge is very low
✔✔The technician is using an analog multi meter to check a run capacitor. With the
meter set to OHMS the needle swings towards zero and then slowly rise is toward
infinity. What does this tell the technician about the capacitor? - ✔✔D. The capacitor
charges and discharges
✔✔What is the typical method of staging a two stage compressor in a heat pump
system? - ✔✔B. It is based on deviation from the thermostat set point
✔✔In a heat pump refrigerant circuit, and open check valve is used to: - ✔✔A. Bypass
refrigerant flow around a metering device
✔✔Manufacturers recommend noncommunicating thermostat wire used in residential
applications should not be less than: - ✔✔B. 18 gauge AWG
✔✔What is the recommended total external static pressure used for heating and cooling
equipment with blowers for 5 tons of cooling or less (excluding high velocity)? - ✔✔B.
0.5 IWC
✔✔Referred to the diagram above and answer the question: when troubleshooting and
energized electrical circuit on an electric heat section, 244 V is measured across the
element at points a and B and no amperage is measured. What is the problem with the
system? - ✔✔D. The electric element is open
✔✔The component used to reduce sound transmission and prevent water leaks of a
package heat pump installed on a roof is the: - ✔✔A. Curb gasket
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
✔✔The following measurements are recorded on an operating heat pump system. The
heat pump is operating with the compressor only with no auxiliary heat.
-heat pump only supply air temperature 92°F, heat pump only return air temperature
70°F, outdoor temperature 54°F, supply air temp./Auxiliary heat on 115°F, return air
temp./Auxiliary heat on 70°F, CFM 1228
What is the heating capacity of the unit in BTU/H? - ✔✔D. 29,177 btu/h
✔✔R-410A Vapor in line diameters with links 50 feet or less are typically specified for a
vapor pressure drop that does not exceed what value? - ✔✔B. 3 psi
✔✔Which of the following is used to make accurate residential loan calculations? -
✔✔B. ACCA manual J
✔✔The following conditions exist in a circuit that supplies power to three parallel loads:
One load is resistive, one load is capacitive, one load is inductive
, The total current in the circuit when operating will be: - ✔✔D. The sum of the currents
through each load
✔✔what condition can cause a reduction from design capacity in a heat pump? - ✔✔A.
An undersized vapor line
✔✔What can happen if defrost runoff is not properly drained away? - ✔✔B. Ice can
build up on the bottom of the coil
✔✔Undersized ductwork often cause: - ✔✔C. High air quantities and high static
pressures
✔✔Where is the sensor of an outdoor ambient thermostat for a heat pump system
typically installed? - ✔✔C. In the entering airstream to the outdoor coil
✔✔What effect does a low charge have on the switch over operations of a reversing
valve? - ✔✔C. Reversing valves are less likely to shift if charge is very low
✔✔The technician is using an analog multi meter to check a run capacitor. With the
meter set to OHMS the needle swings towards zero and then slowly rise is toward
infinity. What does this tell the technician about the capacitor? - ✔✔D. The capacitor
charges and discharges
✔✔What is the typical method of staging a two stage compressor in a heat pump
system? - ✔✔B. It is based on deviation from the thermostat set point
✔✔In a heat pump refrigerant circuit, and open check valve is used to: - ✔✔A. Bypass
refrigerant flow around a metering device
✔✔Manufacturers recommend noncommunicating thermostat wire used in residential
applications should not be less than: - ✔✔B. 18 gauge AWG
✔✔What is the recommended total external static pressure used for heating and cooling
equipment with blowers for 5 tons of cooling or less (excluding high velocity)? - ✔✔B.
0.5 IWC
✔✔Referred to the diagram above and answer the question: when troubleshooting and
energized electrical circuit on an electric heat section, 244 V is measured across the
element at points a and B and no amperage is measured. What is the problem with the
system? - ✔✔D. The electric element is open
✔✔The component used to reduce sound transmission and prevent water leaks of a
package heat pump installed on a roof is the: - ✔✔A. Curb gasket
