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

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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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Lennox 10HPB36-10P is blowing luke warm air.


What coil is getting cold? In cooling the evaporator coil should be getting cold not the outdoor condensing coil. Verify you have the tstat setup for heat pump, verify you have a proper refrigerant charge.

Apr 19, 2017 | Heating & Cooling

Tip

How Heat Pumps Work


How on earth can you get hot air or hot water from very cold outside air? How does a heat pump make this heat out of cold air?
When certain gases change their state from a liquid to a gas or from a gas to a liquid the magic happens.

A heat pump can do some pretty amazing things, when it comes to making heat. To understand the way they work, you must first understand what happens when certain gases change from a liquid state to a gas and back to a liquid again. To simplify it a bit we need to look at a basic air conditioning system. The refrigerant in an air conditioning system is changing to a liquid in the outdoor condenser. The compressor compresses the gas forming a hot gas. As this gas cools under high pressure it changes into a liquid form.

Inside the indoor coil the liquid is pushed through a small hole or orifice. When it comes out the other side it rapidly changes it’s state to a gas as the pressure suddenly drops. The rapid pressure drop changes the refrigerant to a very cold gas. Air flowing over the cold gas inside the pipes makes the air cool and provides air conditioning.


Now for a heat pump the process is much the same, only coils are just switched by used a reversing valve in the outdoor condenser unit. Instead of the heat being purged to the outside from the condenser unit, the indoor unit then becomes the condenser coil. The outdoor coil becomes the cold coil and cools the outside. This is why if it is very cold outside the unit will have to run in air conditioning mode for a short time to defrost the outside cold coil. When this happens the system will usually have electric heat inside to run and keep the indoor air warm.

The reality is that a heat pump is really no more than an air conditioner running in reverse. Through the magic of using refrigerants, a heat pump can then run many times more efficiently than straight electric heat. A careful heat loss/gain should always be performed by a qualified service person before any sizing of a unit. Too large or too small of a heat pump system can make it inefficient and possibly cause it to be very uncomfortable. The longevity of the unit can also be affected by sizing and installation. Be patient and look carefully for the best contractor to install your system.

A properly designed and installed heat pump system can give you many years of comfort and efficiency. If you look for and find the contractor that can do the job right you will get many trouble free comfortable years from your heat pump unit.

on Dec 29, 2009 | Heating & Cooling

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

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

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

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 | Heating & Cooling

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

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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