What does the liquid line do in AC unit?

The suction line connects the evaporator to the compressor, the discharge line connects the compressor to the condenser, and the liquid line connects the condenser to the expansion device. The expansion device is typically located at the end of the liquid line, at the inlet to the evaporator.

What is the purpose of a liquid line filter drier and where is it located in the system?

Filter driers are usually installed in the liquid line of a dry-expansion refrigeration system, where they have a dual function. First, they trap coarse particulate contamination and copper shavings, and second, they capture any moisture present in the system.

How do I know if my liquid line filter drier is clogged?

How can you tell if you have a clogged liquid line filter drier? If there is a noticeable temperature drop from one side of the filter drier to the other, this means that there is a pressure drop. Remember that temperature follows pressure and temperature is something that we can measure on the outside of the tubing.

Should the liquid line be hot?

When the system is operating, the large insulated suction line should be cold to the touch and sweating at any point where there is no insulation. The smaller uninsulated liquid line should be warm to the touch after the system has been operating for 10 or 15 minutes.

What is a liquid line restriction?

RESTRICTION CHECKLIST. Any restriction or damage to the liquid line from the receiver outlet to the metering device inlet will have similar symptoms as a restricted filter drier. Because the filter drier is located in the liquid line, a restricted filter drier can now be referred to as a liquid line restriction.

How do you fix liquid restrictions?

The good news about a liquid line restriction is that you, as the technician, can solve the problem on an air conditioner by replacing the filter drier, the screen (if needed) and the TXV.

Why is the filter drier important quizlet?

Why is the filter drier important? It keeps the system clean and dry.

Is a filter drier necessary?

A Filter Drier is an important part of an air conditioning system. A Filter Drier is so important that manufacturers normally supply one to install with a new home comfort system. Absorb system contaminants, such as water, which can create acids.

How can a technician determine when a filter drier is stopped up and needs changing?

How can a technician determine when a filter drier is stopped up and needs changing? The pressure drop will exceed 2 psig.

What makes a liquid line hot?

High compression ratios from the low evaporator pressure will cause high heat of compressions, thus high discharge temperatures. High superheats. Both evaporator and compressor superheats will be high. This is caused by the TXV, evaporator, and compressor being starved of refrigerant from the liquid line restriction.

Should liquid line be insulated?

There is no need to insulate the smaller, warmer copper pipe, often called the liquid line, because not insulating this line allows it to shed heat which is exactly what you are trying to do with an AC system.

What are the most common causes of a restricted liquid line?

Liquid line restrictions can be caused by a restricted filter-drier, a restricted thermostatic expansion valve screen, a kinked liquid line, a bent lower condenser coil, or an oil-logged capillary tube. An evaporator that is starved of refrigerant will house a starved compressor and condenser as well.

What is a liquid line in a refrigerant system?

Residential units that are charged with refrigerant at factory level and hermetically sealed do not use these devices as the possibility of moisture and particles entering the system is minimal. There are basically two types in used today. Liquid Line Type is placed after the condenser coil and before the expansion valve.

What is the purpose of the liquid line type?

Liquid Line Type is placed after the condenser coil and before the expansion valve. The liquid refrigerant that flows from the condenser to the expansion valve is filtered from particles and moisture before entering it. Good filter will filter out particles that are 20 micron or above from the system.

What is a suction line in an air conditioner?

The suction line is the part of the piping system of a ac/ref unit. After the refrigerant evaporates into a gas in the evaporator coil the section of piping from this coil to the condenser coil is called the suction line. At the condenser the refrigerant condenses back to a liquid and transfers…

What does a liquid line solenoid do on an air conditioner?

A Liquid Line Solenoid and What it Does. The other cool thing is you don’t need any Low voltage controls between the indoor and outdoor unit. The solenoid is in the liquid line near the air handler inside, so by opening the valve the suction pressure increases and the compressor turns on and when it closes the compressor pumps down and shuts off.