Question 1

Terminal identification is used to simplify a schematic diagram.

Accepted Answer

Terminal identification is often used to replace entire circuit components in schematic diagrams, simplifying the overall presentation of the diagram by condensing it down to key components.

Question 2

Heat-pumps contain a ____ that is used when the outside ambient temperature is too low to provide enough heat transfer.&#10;A) more efficient refrigerant system&#10;B) pressure-based system&#10;C) restore system&#10;D) back-up heating system

Accepted Answer

Heat-pumps rely on the transfer of heat from the outside air to heat the home. When the temperature drops below a certain point, this method becomes less efficient. A back-up heating system, such as electric resistance heating, is used to supplement the heat-pump and maintain comfortable temperatures inside the home in these conditions.

Question 3

The schematic of a heat pump may be divided into three main sections: (1) the outdoor compressor controls, (2) the ____ controls, and (3) the low-voltage controls.&#10;A) high-voltage&#10;B) indoor compressor&#10;C) indoor resistance heat and blower-fan&#10;D) outdoor resistance heat and thermostat

Accepted Answer

The indoor resistance heat and blower-fan controls are necessary for the heat pump to function properly. The outdoor compressor controls and low-voltage controls are also important, but the indoor resistance heat and blower-fan controls are specifically related to the heat transfer process within the building. The high-voltage and outdoor resistance heat and thermostats are not directly involved in the heat pump schematic.

Question 4

When the heat pump is used in the ____ of operation, the outside heat exchanger is being used as the evaporator and cold refrigerant is circulated through it.&#10;A) manual mode&#10;B) heating mode&#10;C) programmed mode&#10;D) cooling mode

Accepted Answer

In the heating mode of operation, a heat pump absorbs heat from the outside air (even in cold temperatures) using the outside heat exchanger as the evaporator. Cold refrigerant circulates through this evaporator, absorbing heat from the outside air to then heat the inside of a building.

Question 5

In the ____, the outside heat exchange unit is used as the condenser and the inside heat exchanger is used as the evaporator.&#10;A) manual cycle&#10;B) heating cycle&#10;C) defrost cycle&#10;D) cooling cycle

Accepted Answer

In the cooling cycle of a heat pump, the outside heat exchange unit serves as the condenser while the inside heat exchanger serves as the evaporator. This allows for the heat pump to transfer heat from the inside of a room to the outside during the summer months.

Question 6

The terminal board shows terminal connections marked inside hexagon-shaped figures.

Accepted Answer

This is true. Terminal connections are often marked with hexagon-shaped figures on terminal boards.

Question 7

The two-stage thermostat is a thermostat that contains one mercury contact and one zinc contact.

Accepted Answer

The two-stage thermostat contains two mercury contacts and one bimetallic strip.

Question 8

Defrosting is done by disconnecting the condenser or outside fan motor and ____ the flow of refrigerant through the coil.&#10;A) reversing&#10;B) stopping&#10;C) activating&#10;D) slowing

Accepted Answer

Defrosting is achieved by reversing the flow of refrigerant through the coil, which changes the operation of the heat pump to warm the outdoor coil and melt any frost or ice buildup.

Question 9

A heat pump provides both heating and air conditioning within the same unit.

Accepted Answer

Yes, a heat pump is a unit that can provide both heating and cooling functions, making it a versatile and energy-efficient option for home or business owners.

Question 10

The sequence timer is an on-delay timer used to connect the heating elements to the line all at once.

Accepted Answer

A sequence timer is used to connect heating elements (or other devices) to the line in a sequential manner, not all at once, to avoid a high inrush current.

Deck 43: Heat-Pump Controls