HVAC NATE Heat Pump Questions And
Verified Answers Latest 2026 Update |
Graded A+ | 100% Success
What is balance point in a heat pump? - CORRECT ANSWER -When the capacity, BTU, is the
same rate as the heat loss of a structure.
Do electric air cleaners remove odors? - CORRECT ANSWER -No
When should a suction line accumulator be used in a residential heat pump? - CORRECT
ANSWER -Only when recommended by the manufacturer if long refrigerant lines increase
system charge over recommended maximum charge.
The measurement of a heat pumps efficiency is often stated using its "Coefficient of
Performance" or COP. What is the COP (Coefficient of Performance)of a heat pump? - CORRECT
ANSWER -Heat pumps heat output (watts) divided by its total electrical input (watts)
What is a benefit in using electronic air cleaner? - CORRECT ANSWER -Indoor Air Quality (IAQ)
quality is improved.
What is the thermal balance point of a dual fuel heat pump? - CORRECT ANSWER -Outdoor
conditions at which the capacity of auxiliary heat alone matches the heating load.
,What is the minimum circuit amp listed on a units' data plate is used to determine? - CORRECT
ANSWER -The max fuse or circuit breaker size.
How are heat pumps particularly sized? - CORRECT ANSWER -Based on the cooling load.
What is an effective method of reducing sound when AHU is located in a closet? - CORRECT
ANSWER -Use Vibration isolators.
When wiring a 20 amp FLA motor what is the minimum amp fuse or circuit breaker that should
be used? - CORRECT ANSWER -25amp
How is the typical staging of a two stage HP system determined? - CORRECT ANSWER -Use the
deviation of the t-stat setting to determine when to engage each stage.
What is the purpose of a sequencer in a HP with an AUX 20 kW electric heater? - CORRECT
ANSWER -Energize one or two elements and the blower then energize the other elements in
timed intervals.
In a HP (heat pump) circuit what is used to by-pass refrigerant flow around the metering device?
- CORRECT ANSWER -An open check valve.
, What is the most commonly used type of fan in residential systems? - CORRECT ANSWER -The
forward curve centrifugal fan.
When is condensation on vapor lines a concern?when the lines are routed inside a wall. -
CORRECT ANSWER -When lines are routed inside a wall.
In a single zone system; if a customer complains of feeling damp or sticky the cause could be
what? - CORRECT ANSWER -Unconditioned air being pulled into the duct work through holes in
the duct.
When performing indoor air balancing tests how should the t-stat should be set? - CORRECT
ANSWER -Should be set to bring on the indoor fan on mid-high speed.
Most manufacturers recommend what size t-stat wire? - CORRECT ANSWER -The smallest most
allowable, 18AWG (All Weather Gauge)
Where should you check voltage input to a compressor? - CORRECT ANSWER -At the load side
of the contactor.
HP (Heat Pump) unit; 1st and 2nd stage appear to be calling, compressor runs but not electric
heater, what is the problem? - CORRECT ANSWER -Second stage is open.
Verified Answers Latest 2026 Update |
Graded A+ | 100% Success
What is balance point in a heat pump? - CORRECT ANSWER -When the capacity, BTU, is the
same rate as the heat loss of a structure.
Do electric air cleaners remove odors? - CORRECT ANSWER -No
When should a suction line accumulator be used in a residential heat pump? - CORRECT
ANSWER -Only when recommended by the manufacturer if long refrigerant lines increase
system charge over recommended maximum charge.
The measurement of a heat pumps efficiency is often stated using its "Coefficient of
Performance" or COP. What is the COP (Coefficient of Performance)of a heat pump? - CORRECT
ANSWER -Heat pumps heat output (watts) divided by its total electrical input (watts)
What is a benefit in using electronic air cleaner? - CORRECT ANSWER -Indoor Air Quality (IAQ)
quality is improved.
What is the thermal balance point of a dual fuel heat pump? - CORRECT ANSWER -Outdoor
conditions at which the capacity of auxiliary heat alone matches the heating load.
,What is the minimum circuit amp listed on a units' data plate is used to determine? - CORRECT
ANSWER -The max fuse or circuit breaker size.
How are heat pumps particularly sized? - CORRECT ANSWER -Based on the cooling load.
What is an effective method of reducing sound when AHU is located in a closet? - CORRECT
ANSWER -Use Vibration isolators.
When wiring a 20 amp FLA motor what is the minimum amp fuse or circuit breaker that should
be used? - CORRECT ANSWER -25amp
How is the typical staging of a two stage HP system determined? - CORRECT ANSWER -Use the
deviation of the t-stat setting to determine when to engage each stage.
What is the purpose of a sequencer in a HP with an AUX 20 kW electric heater? - CORRECT
ANSWER -Energize one or two elements and the blower then energize the other elements in
timed intervals.
In a HP (heat pump) circuit what is used to by-pass refrigerant flow around the metering device?
- CORRECT ANSWER -An open check valve.
, What is the most commonly used type of fan in residential systems? - CORRECT ANSWER -The
forward curve centrifugal fan.
When is condensation on vapor lines a concern?when the lines are routed inside a wall. -
CORRECT ANSWER -When lines are routed inside a wall.
In a single zone system; if a customer complains of feeling damp or sticky the cause could be
what? - CORRECT ANSWER -Unconditioned air being pulled into the duct work through holes in
the duct.
When performing indoor air balancing tests how should the t-stat should be set? - CORRECT
ANSWER -Should be set to bring on the indoor fan on mid-high speed.
Most manufacturers recommend what size t-stat wire? - CORRECT ANSWER -The smallest most
allowable, 18AWG (All Weather Gauge)
Where should you check voltage input to a compressor? - CORRECT ANSWER -At the load side
of the contactor.
HP (Heat Pump) unit; 1st and 2nd stage appear to be calling, compressor runs but not electric
heater, what is the problem? - CORRECT ANSWER -Second stage is open.
