The main valve in a pilot-operated four-way reversing valve is moved by pressure created by the ____.

The smaller line in an air-to-air split-system heat pump is known as the ____ line.

A common method of starting defrost uses an air pressure switch that measures the difference in pressure ____.

When brazing a four-way reversing valve, a wet rag could be wrapped around the body of the valve to minimize the chance of internal damage to the valve.

TXVs used in cooling-only air-conditioning units and heat pumps are interchangeable as long as they are the same size and for the same refrigerant.

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

The water-to-air heat pump might not need auxiliary heat because the water can be at relatively constant temperature all winter.

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

The coil of the air-to-air heat pump system that is the indoor unit is known as the ______ in the heating mode.

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

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

A common metering device is a combination flow device and check valve. This device is referred to as a(n) _______.

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

An air-to-air heat pump ____ heat from the outside air and deposits it in the conditioned space.

The larger line in an air-to-air split-system heat pump is known as the ____ line.

Termination of the defrost cycle by temperature occurs when the temperature sensor reaches ____.

What prevents cold air from being circulated to the heated space during the defrost cycle?

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

In the emergency heat mode, the auxiliary heat source becomes the primary heat source because of heat pump failure.

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

The coil of the air-to-air heat pump system that is the indoor unit is known as the ______ in the cooling mode.

In heat pump systems the sensing bulb is typically exposed to high temperatures and could rupture the valve diaphragm. For this reason, a(n) ______ TXV is usually used.

Some heat pump systems when not capable of meeting the heating needs of the structure are equipped with second-stage heat, called _______.

The lowest outside air temperature at which the heat pump system can satisfy the heating needs of the structure without requiring auxiliary heat is called the _______.

The coefficient of performance of a heat pump operating in the heat mode tends to _______ as the outside air temperature drops.

When a heat pump is added to an electric furnace, the indoor coil must be located after the _______ strips.

Most occupants will normally operate their system at about ____°F.

AHRI rates condensers with ____°F air passing over them.

At what conditions are air-conditioning systems rated?

At typical operating conditions, the standard air-conditioning system will operate with an evaporator boiling point of ____°F.

A normal evaporator superheat at the evaporator outlet in a standard efficiency air-conditioning system operating under design conditions will be ____°F.

At typical operating conditions, the high efficiency air-conditioning system will operate with an evaporator boiling point of ____°F.

A more accurate rating system for air-conditioning equipment that takes into consideration operation during the complete cycle is the ____ standard.

The ____ rating is a steady-state rating and does not account for the time the unit operates before reaching peak efficiency.

Ratings that are not completely accurate are known as ____.

Since the evaporator absorbs both sensible and latent heat, humidity must be taken into account and considered part of the load on the evaporator.

High efficiency condensers can actually be too efficient on cool days.

The larger the EER rating, the less efficient the equipment.

Why does the high efficiency system have a higher operating efficiency?

What are the three major power-consuming devices that may have to be analyzed from time to time on an air-conditioning unit?

The seasonal energy efficiency ratio (SEER) calculations include the energy used in the start-up and shutdown cycles.

The compressor amperage of a 3-ton system operating on 230 V is approximately ____ A.

Capacitors should be shorted with a (n) ______ before checking with an ohmmeter.

Before installing a gauge on the high-pressure side of a system, you should do which of the following?

The high- and low-side pressures of an operating air-conditioning system can be converted, using a temperature-pressure chart, to which temperatures?

When the ambient outside air temperature is 95°F and the unit is a high-efficiency unit, the lowest condensing refrigerant temperature when the unit is operating properly is

The suction gas may have a high superheat if the unit has a (n) _______ charge.

If the suction pressure is low and the suction line is warm, the system has a ___ evaporator.

If a condenser circuit breaker is tripped, you should

When troubleshooting a small system, the first step is to attach the high- and low-pressure gauges.