Unit 36

Multiple indoor units and one outdoor unit

A typical multi head, ductless split system is configured with

High temperature

Air conditioning is classified as which type of refrigeration?

Comfort cooling

Air conditioning is often referred to as

There is a clearance volume that traps some refrigerant

All of the following are true, regarding the scroll compressor, except

The pressure and temperature of the refrigerant increase

As a freshman, undergoes compressor process

55°F supply air, 75F return air

At or near design conditions, the supply and return temperatures for an air conditioning system are closest to

The temperature of the suction gas

Discharge gas temperature is affected most by

1%

East degree of condenser sub cooling will increase system efficiency by approximately how much

hot, dry climates

Evaporative cooling systems are best suited for which type of climate?

Conduction, infiltration, and radiation

Heat leaks into a structure by which three methods

There will be no net duck losses, while the system is operating in either the cooling or heating mode

If a duck system is on insulated and runs through the condition Space.

One quart

On average, each ton of system capacity has the ability to remove, approximately how much moisture from the air

Either on the roof of a structure or at ground level

Package type air-conditioning units are in intended to be located

Oil

Radial sealing on a scroll compressor is typical accomplished with

Fully hermetic, suction, gas, cooled pumps

Reciprocating compressor is used in residential applications are most likely to be

Reciprocating compressor

The compressor type that relies on pistons moving up and down within cylinders is

Superheated vapor

The refrigerant, that both enters and leaves a properly operating compressor can be described as

Prevent the vapor, refrigerant in the line from absorbing additional unwanted heat

The suction line is insulated to

By both the temperature in amount of air passing through the coil

The temperature of the evaporator coil is affected

Sensible, heat, and latent and heat

The two types of heat transfer that or facilitated by the evaporator are

Evaporator superheat

Thermostatic expansion valves are designed to maintain constant

Slant, A, and H

Three common evaporator coil configurations found on air conditioning systems are

Bleed port

What feature on a thermostatic expansion valve allows the system to pressures to equalize during the off cycle

Package type equipment has no field install refrigerant lines

What refrigerant lines are field installed on the typical package type air conditioning unit

Liquid line and suction line

What refrigerant lines are field installed on the typical split system air conditioning

Moisture content

When sizing, and select the air-conditioning equipment, which of the following must be taken into account

Cool and humid

Which of the following best describes the air that enters the structure from being treated by an evaporator cooler

100°F dry-bulb, 71F wet bulb

Referring to figure 36.18, the 1% design wet bulb and dry bulb temperature for Napa California in the summer are.

Once Craw is stationary and one scroll orbits

Which of the following best describes the squirrels in a scroll compressor

120F

Which of the following is a possible condenser saturation temperature for an R-410a air conditioning system that is operating with an outside ambient temperature of 90°F

There is no clearance volume on these compressors

Which of the following is true regarding the rotary compressor?

The maximum desire discharge line temperature for R-410 a compressor is

175°F