Receiving Helpdesk

should ac return line be hot

by Alisa Frami Jr. Published 3 years ago Updated 2 years ago

Full Answer

Is your AC liquid line very hot?

Is Your AC Liquid Line Very Hot? (Possible Causes & Fixes) – Upgraded Home Is Your AC Liquid Line Very Hot? (Possible Causes & Fixes) The liquid line on your air conditioner is a big part of its proper operation. It is common for the line to become hot, and it is often due to it being dirty or underpowered.

Why is my outside AC line running hot?

my outside a/c line running to the compressor is hot and my unit is running more than normal plus is having trouble cooling the house. thanks for any help. The liquid line going to the house being hot is a sign of either a dirty outdoor unit coil or the outdoor fan not turning. Turn off the breaker to the unit and wash the coil with a garden hose.

Should the suction line on my air conditioner be hot?

The suction line should be cold or cool to the touch. If your line is hot then there is a chance that there is not enough refrigerant in your AC, and it may need to be recharged. This is the most common problem for a hot suction line. Air Conditioner Air Flow Is Weak?

Can an HVAC return air vent be in the floor?

An HVAC return air can be in the floor, but they work much better on walls up about 7 feet. It's best to put them on an interior wall across the room from the supply duct. © 2018 Tim Carter

How cold should AC return line be?

What Should the Temperature Difference Be Between the Supply and Return Vents? While there isn't any perfect temperature you should set your HVAC system to, there is an ideal temperature difference between the supply and return air, which should be between 16 and 22 degrees Fahrenheit.

Should AC line be hot or cold?

The Copper Pipe (Suction Line) should be sweating and cold to the touch during a hot day. If it is not cold, your compressor could be off (bad capacitor/ hard start kit) or low on Refrigerant.

Why AC discharge line is hot?

The three causes for high discharge temperatures are: High condensing temperature. Low evaporator pressures and temperatures. High compression ratios.

What temperature should the liquid line be?

Also, note how much warmer the liquid line is than the outdoor temperature. It should be between 3°F and 20°F warmer than the outdoor temperature. If it is above or below that range, connect gauges.

Should both AC pipes be cold?

There are two pipes from the condensing unit (outdoors) to the evaporator (indoors). One should be full of liquid refrigerant on its way to the expansion valve, the other should be cooler, returning to the compressor suction.

Why is my refrigerant line not cold?

If your central AC is not blowing cold air, the refrigerant may be the problem. The unit could be running low and need additional refrigerant added. The most likely cause of this is a leak. A leak not only keeps the AC unit from cooling properly, but also it can cause other issues within the home.

Which line should be warm when an air conditioning system is operating correctly?

When the air conditioning system is operating, the suction line should feel hot to the touch.

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

If the filter drier is partially clogged, there may be a few degree temp drop across it. However, if the filter drier is completely clogged, there will be a large temperature drop across it and likely frost due to the low temp of the refrigerant exiting the clogged filter drier.

What temp should my evaporator coil be?

Temperature leaving the air handler's evaporator coil: similar to above, measure the supply air temperature at a hole or crack in the supply plenum above (or "downstream from) the evaporator coil. It should be around 55 degF.

What is a good suction line temperature?

The high-side pressure corresponds to 120 degrees saturation or 278 psig. Using a charging calculator, you can determine that the superheat should be 8 degrees to 10 degrees. If the metering device were fixed, the superheat would be 10 degrees, meaning the suction line temperature would be 48 degrees to 52 degrees.

What is the normal temperature of a refrigerant line?

A normal temperature would be around 90-to-100F. But if there was a problem (such as an overcharge, a defective outdoor blower, a very dirty outdoor coil, etc.), pressure inside the lines will be higher than normal, and as pressures get higher the temperature of the refrigerant inside gets higher as well.

Why does my liquid line not feel hot anymore?

If the blower is turned OFF, no more warm air comes in contact with the coil...no more heat is transferred to the refrigerant...the refrigerant no longer boils...pressures drop and temperatures (inside the pipes) do so as well. That is why the liquid line does not feel that hot anymore.

Why is my refrigerant not cooling?

If your system pressures are higher than normal, the refrigerant temperatures will be higher than normal as well (or, say: not as cold). You then feel your unit is not cooling as much. But the trouble could also be an undersized system...too small a unit for your house.

Is the condensor cooler than the ambient?

Overall, it seems to cool a little better, but the liquid line is still much hotter than the ambient and the suction line is barely cool to the touch (perhaps 75deg) at the compres sor.

Can you clean an outside coil?

Watering with a garden hose is not enough.

Does an evaporator coil freeze up?

With the unit running, the evaporator coils don't seem to be getting very cold and don't free ze up. Indeed. It is the outdoor coil the one that (for the most part) gets the blunt of the dirt. It's good the indoor coil don' t freeze up, but not good that it doesn't get cold either.

Why should AC return lines be insulated?

AC return lines should always be insulated when their operating temperatures are below the ambient temperature to prevent condensation and heat gain to the refrigerant. Although liquid lines are warm/hot, they should be insulated in spaces where the ambient temperature exceeds the liquid line temperature such as an unconditioned air plenum or attic.

What is the temperature of a cool/cold line?

The cool/cold line is known as the suction line or ac return line. It conveys fluids, such as refrigerants, at temperatures of about 40°F [4.4°C]. The liquid line conveys warm/hot fluids at about 110°F [43.3°C]. Finally, the discharge line is typically very hot and operates at about 150°F [66°C]. AC return lines should always be insulated ...

Is discharge line insulation good?

Discharge lines are not typically insulated, however, they should be insulated when personnel protection is of concern and heat loss would not be desirable for the given application. Closed-cell elastomeric foam pipe insulation, also known as rubber, is a preferred insulation type for ac return lines due to its closed-cell structure ...

Where should HVAC return air ducts be?

"An HVAC return air duct should be in every room except a bathroom and kitchen. They should be on interior walls across the room from the supply ducts that should be washing exterior walls with conditioned air."

Why does my furnace need return air?

The reason for return air is simple. Your furnace is simply a recirculating pump. Instead of pumping water, it is pumping air. We need to get the air back to the pump. Furthermore, without a return air duct in each major room, the supply duct air has to "push" all of the air in the room out of the way as it makes its way towards you.

What is the air duct in your house?

The air ducts in your house should be designed exactly like the blood vessels in your body. Think about it. The veins and arteries supplying blood to the different parts of your body, even out to your fingers and toes, are the same size as the veins and arteries returning that blood back to your heart.

What is the purpose of a return air grill?

The intent is to wash the exterior walls with heated or cooled air. You are trying to combat the heat or cold at its source. The single giant return air grill in the floor balances the load at the furnace motor but does nothing to promote cross-ventilation in each room.

Where do you run ducts in an attic?

This duct extends up to the second floor where it often lines up with an interior hallway wall. Often you can collect the ceiling air through a network of flexible pipes in an attic. These pipes join together in one central location that permits you to run a duct down to the basement or a second-floor closet.

What happens if you put too much cooling in a unit?

If you put in a unit that is too powerful (produces too much cooling), it will short cycle. It will turn on, blast out vast quantities of cool air, and then shut off. The result will be improper dehumidification. You will be cool and clammy.

Where is the red arrow on a furnace?

The red arrow points to a large wall-mounted return-air vent. The furnace or air handler is probably on the other side of the wall behind that door. How many return air vents should be in your home? The number MAY SURPRISE YOU! Copyright 2018 Tim Carter

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