Question about Frigidaire FAH125P2T Air Conditioner

1 Answer

AC not cooling enough

The air from my unit is not cold enough. New condenser unit. Coil is only one year old. When heat is applied to the bulb of the coil it gets about 10 degrees cooler but not cool enough. Could this be the Evaporator Coil, Expansion Valves that is bad and needs to be replaced?

JMac

Posted by on

1 Answer

Probably low on refrigerant, if valve moves when heated it is working, assuming the system is matched.

Matt

Posted on Jul 01, 2008

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I think compressor needs to be replaced, ac unit not pumping any cold hair in the house. I have a weatherking a/c model 10AJA3001, how much eventually it would take to replace it?


You're looking at around $800-$1000 to replace the compressor and if the condensing unit has some years on it (say 12 or more) it would probably be cost-effective to think about a new one, except for the fact you'd probably have to change the evaporative (inside) coil - to match the new condensing (outside) unit because chances are - your old unit is R-22 and you're going to have to put in a condensing unit that will be using a different refrigerant.
All that being said - I would try to find out the reason your AC is not cooling and hope it is a minor problem that can be easily repaired.

Jun 12, 2011 | Weather King 10AJA6001AH Air Conditioner

Tip

Why your unit is freezing up.


To understand why your AC or heat pump is freezing up, it helps to know how your system works.

There are 7 major parts to an AC system, 9 with a heat pump.

1 - Condenser/heat pump (The outdoor unit)
2 - Air Handler (the indoor unit unless the system is a package unit, then all is outside in one system. The air handler is usually found under the home, in an attic, or in a closet.)

In the condenser are the following major parts.

3 - Compressor
4 - Condenser coil
5 - Condenser fan
6 - (HPs only) reversing valve

In the air handler are the following major parts.

7 - Blower motor
8 - Evaporator coil
9 - (HPs only) electric heat strips

Some systems known as "dual fuel systems" use another heat source in place of the heat strips, usually a gas furnace. I will address gas furnaces in another post.

When an air conditioner is operating properly several things are taking place.

1 - The compressor is compressing or "pumping" refrigerant through the system.

2 - through changes in pressure, the refrigerant makes the evaporator coil get very cold, and the condenser coil gets very hot.

3 - The blower motor/fan circulates air across the evaporator coils, as the room temperature air (Also known as "indoor ambient") goes through the cold coil, it exits, cooled approximately 15 to 20 degrees cooler than when it entered. (In a ducted system, the blower is also the fan that circulates the air throughout the home.)

4 - The condenser fan circulates air across the condenser coils. As the outdoor air goes through the condenser coil, it removes heat from the coils that are very hot. This in turn removes heat from the refrigerant so it can run its cycle again, and through pressure changes, cool the evap coil.

5 - With a heat pump, the reversing valve reverses the flow of refrigerant in the condenser and evaporator coils.
In AC mode, the evaporator coils get cold, and the condenser coils get hot. But in heat mode, the evaporator gets very hot, and the condenser very cold.

Now, whichever coil is getting cold will freeze up if there is inadequate air flow across the coil, as the refrigerant in it is far below freezing, and there is not enough airflow to keep the humidity in the air from freezing on the coil.

Things that can cause poor airflow are,

1 - Dirty/clogged coils
2 - dirty/clogged filter (will only effect evaporator coil)
3 - Closed/blocked vents (will only effect evaporator coil)
4 - Malfunctioning or dirty fan

Low refrigerant will also cause a coil to freeze up, reduce efficiency and cause the system to run for long periods of time. Not to mention, shortening the life of the unit.

With a heat pump, in heat mode only, the condenser (outdoor) coil will routinely begin to freeze up in cold temperatures. This is due to the fact that the refrigerant is below freezing, and the cold outdoor ambient temp is not warm enough to keep the condensation in the air from freezing on the coil.

Note, a properly working AC should never freeze up.

A heat pump is equipped with defrost controls to prevent ice buildup.
Some are controlled by timers, some by temp.

When a HP is going into defrost mode, the condenser fan shuts down, the reversing valve reverses the flow of refrigerant and the once cold condenser coil now gets very hot, defrosting the coil. (Many people have said this process sounds like the unit is coming apart, or about to explode and are frightened by the "smoke" which is really just steam from melting ice that comes off the unit.)

During defrost mode, the secondary or "auxiliary" heat comes on to ensure that you are still getting warm air from the vents. (Again, this can be electric heat strips or a dual fuel system)

If you are experiencing cold air from the vents during defrost, that means your auxiliary heat is malfunctioning.

The auxiliary heat is used for three purposes.

1 - during defrost mode to maintain warm airflow (automatic)
2 - when the HP cannot maintain the set temp due to extreme outdoor temps. It comes on when the indoor temp drops several degrees below the set temp on the thermostat (automatic)
3 - For emergency heat source when the HP is not working. (Manual)

To recap....

Iced up coils?

Poor airflow
low refrigerant
Malfunctioning fan
failing defrost system


There are two things that can be done in a pinch to help de-ice frozen coils. This may get you by until the repairman can get there, or you can fix the system if you are a do-it-yourselfer.

HPs frozen outdoor coil in heat mode, not going into defrost?

Cover most of the vents, and turn the system onto cooling mode until the outdoor coil is thawed. then uncover vents and return to heat, or emergency heat. (this usually takes 15 min or less)

Frozen coils in AC mode with a heat pump?
Turn the system to heat with the thermostat on just high enough to get the system to come on. (again, usually takes 15 min or less to thaw.)

AC only, with frozen evap coils? (this can sometimes be seen frozen all the way outside to the compressor on the copper lines.)

Turn the system off, and the fan switch from "auto" to on".
This will usually defrost the coils within 1 to 2 hours.
(If your system has the furnace in line before the evap coil, turn the system to heat, and the furnace will defrost the coil within minutes.)



on Dec 25, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Unit won't cool. Unit is set on is on cool, but warm air comes out. Is there a reset button on the unit ? Unit is 21 1/2 years old.


Some of those old Mach 3's have a manual reset pressure switch, but you will have to take the cover off to find it. Most manual resets have a red button to push to reset. The unit may be low on refrigerant or the condenser coil stopped up with dirt.

May 13, 2011 | Coleman Mach III Air Conditioner

2 Answers

Hello, My condensing unit (LG-LMU245HV) and my wall unit (LG-LMN185HV) are brand new and were installed just one month ago. Everything has been running fine but now all of a sudden now the air coming...


Hi, when the copper lines at the condensing unit, the larger of the 2- start to form ice, you have a freon leak. The unit is new, so I would expect the leak to be at one of the welded/brazed joints. What will happen, is the indoor unit, the evaporator coil will start to ice over and block off all air flow through through the coil. I hate to tell you this, you will need to call the installer out to do a leak check on the unit. They will then need to pump it down, braze the leak with sil-phos, or silver solder and recharge the unit. This is the problem, I see this a lot on new units. Someone forgot to do a leak check on it. Being only a month old, it has to have a warranty on it, shouldn't cost you a dime, but this is the problem, indeed!! Please keep me updated on this and get them out there. It will never cool until they fix the leak and recharge it. Please don't forget to rate me on this, I know you will be kind. Keep me posted and you can contact me by my user name below. Thank you Zeke! You still have freon in the unit, just low enough to start the suction line outside to start to ice and loose your cooling.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor

Aug 06, 2010 | Air Conditioners

1 Answer

Fan runs but no cool air. I don't think compressor is kicking in. Thermostat is working because when I adjust temp to be below or equal to air temp, AC unit turns on. When air temp drops as trailer cools...


Have you cleaned the unit? The condenser coil? The filter? The evapartor coil? Sounds like an airflow problem. You need to clean these areas. You can clean the condensor coil with water hose and a coil brush you can get at the hardware store. Clean the evaparator with the same brush. YOU can use a hairbrush if you don't have anything else. But make sure you go up and down on the fins on the coils not sideways. You might check your blower fan for dirt also. Good luck I hope I helped you. Could also be low on charge but first try cleaning.

Jun 28, 2010 | Air Conditioners

1 Answer

What's the difference between dry and cool setting and when should dry be used


Dry is a dehumidifier option. There is a heating element in the unit to heat the cold air back up. The cold evaporator coil causes the moisture in the air to condense on the coil (this is why the AC leaks water) and the air coming out of the vents will be cold. If you are not wanting to lower the temperature in the room but want to take out the moisture then use DRY. All ACs take the moisture out of the air when they are on COOL. So, COOL drys the air and makes it cold. DRY drys the air but warms it back up before sending it out the vents.

Jun 14, 2010 | LG LWHD2500ER Wall/Window Air Conditioner

2 Answers

It blows cold air for 5 min. and the it blows cool air for 15 min. the room warms up . Why does it stops blowing cold air continuasly???? The thermostat was disconectet on purpose so it coul clow cold air...


See if you can reposition the thermister on the facing of the evaporator coils. That could be it or the thermister might be bad. They don't use copper/mercury sensing bulbs these days. They use these cheap thermisters.

May 22, 2010 | LG Heat cool Window Air Conditioner

4 Answers

Water/condensation is backing up in the bottom of the unit and overflowing into the house.


The drain in the condensate drip pan is clogged. Locate it and clean it out.

Charlie

Aug 14, 2009 | Samsung AS1293L Air Conditioner

1 Answer

Window ac unit is not blowing cold air


When the unit is running, go outside and put your hand near the condenser fins, this air that comes out should be slightly warmer than the ambient temp. If it is not you will need to take the unit out of the window and out of its outer case and clean the condenser fins from the inside, this is no easy task as it is very hard to reach. You will want to get a small (toothbrushed sized) brass bristled brush with a long handle. Make sure the evaporator coil (in the front) recieves the same attention and wash the mesh filter that goes in front of the evaporator. Re- assemble and enjoy the cold air.

Jun 07, 2009 | Whirlpool ACQ189XM Air Conditioner

3 Answers

Air Conditioner Blows Warm Air (or at least not cool)


When serviced by a qualified service tech who finds and repairs a leak before recharging a system it is not illegal. However with the age of your unit you may want to balance the possible cost of a new unit against the cost of repairs to the old one. After repairs are made to an old unit you still have an old unit.

Jun 04, 2008 | Kenmore 72055 Air Conditioner

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