Quiz 7

True or False During operation, the compressor motor will rotate in the opposite direction to change the direction of refrigerant flow.

False

True or False In a heat pump system, the indoor and outdoor coils are almost the same size.

False

True or False It is common for the outdoor unit to ice-up when the heat pump is operated in the cooling mode.

False

True or False TXVs used in air conditioning units and heat pumps are interchangeable as long as they are the same size and for the same refrigerant.

False

True or False When a compressor is changed, the four-way valve also must be changed.

False

True or False In the emergency heat mode, the auxiliary heat source becomes the primary heat source and the compressor is disabled.

True

True or False When brazing a four-way valve, heat absorbing paste should be placed around the body of the valve to minimize the chance of internal damage to the valve.

True

What prevents cold air from being circulated to the heated space during the defrost cycle? a. The auxiliary heater turns on the "temper" the air. b. All of the dampers close automatically. c. The indoor fan motor turns off. d. Both a and b are correct.

a. The auxiliary heater turns on the "temper" the air.

The ___ is used to switch the unit between the heating and cooling modes of operation. a. four-way valve b. bi-valve c. two-way valve d. switching valve

a. four-way valve

The term _____ indicates the source of heat while the system is operating in the heating mode and the medium that is ultimately being treated.

air-to-air

If a heat ump is not capable of handling the heat load, a(n) _____ heat source will be added to help handle the load.

auxiliary

In the air-to-air heat pump system, the help that the heat pump gets is called _____ _____.

auxiliary heat

An air-to-air heat pump ___ heat from the outside air and deposits it in the conditioned space. a. adds b. removes c. creates d. restricts

b. removes

When the heat pump is supplying as much heat as the load requires and is operating continuously, it is at what is called the _____ _____.

balance point

When electric auxiliary heat is used with as pump, the best location of the inside coil is _____ the auxiliary heat unit.

before

A(n) _____ thermostatic expansion valve has a check valve built into the body of the TXV

bi-directional

Termination of the defrost cycle occurs when the liquid off the outside coil reaches ___. a. 35°F b. 45°F c. 50°F d. 65°F

c. 50°F

A pressure augmented defrost control is activated by the ___. a. difference of the pressure in the fan compartment and the temperature of the coil. b. difference in pressure between the outdoor pressure and the fan discharge pressure c. difference in the pressure of the air through the outdoor coil d. difference in pressure of the refrigerant in the condenser and the pressure of the coil

c. difference in the pressure of the air through the outdoor coil

The component of the air-to-air heat pump component that is the outdoor unit is known as the _____. (when in cooling mode)

condenser

The indoor coil acts as the evaporator in the summer and the _____ in the winter

condenser

The suction line is known as the ___ line in an air-to-air heat pump split system. a. vapor b. liquid c. transient d. gas

d. gas

The small line in an air-to-air split system heat pump is known as the ___ line. a. gas b. vapor c. solid d. liquid

d. liquid

The main valve in a pilot-operated four-way reversing valve is moved by pressure created by ___. a. refrigerant boiling in the coil b. pressure reduction in the condenser c. change in the action of the metering device d. low and high side pressure difference

d. low and high side pressure difference

The efficiency of a heat pump operating in the heat mode tends to _____ as the outside air temperature drops.

decrese

When oil or gas auxiliary heat is used with a heat pump, the heat pump coil must be located in the _____ of the furnace.

downstream

The component of the air-to-air heat pump component that is the indoor unit is known as the _____. (when in cooling mode)

evaporater

The _____ _____ _____ is a four-port valve that has a slide mechanism in it.

four-way reversing valve

The coil that serves the inside of the house in a heat pump is known as the _____ _____.

indoor coil

In time-temperature defrost controls, the temperature that actuates the control is the temperature of the _____ _____.

outside coil

When thermostatic expansion valves are used on heat pump systems, _____ _____ thermal bulbs are most common in order to prevent the valve's diaphragm from rupturing.

vapor charge or limited charge or critically charge