Question about Coleman Mach 15 Air Conditioner

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Air Handler's Coil is dirty. How do I take it out to clean?

Air Handler's Coil keeps freezing, its quite dirty. I called my ac guy, he sad he needs to take the coil out to clean it. He did not show up to do so. It looks pretty simple to take it out. My question is before I cut the pipes I want to keep the freon in the outside unit. Please some helpful tips. Thanks.

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  • charles raynor May 11, 2010

    I would not suggest you cut the pipes. Call your repairman again, and let him know that you are willing to call someone else to do the job.

    If you cut the pipes, you will be needing a repairman to come out and evacuate the system and recharge it anyway, and it will probably cost you more for this than it would have to let them take care of it initially.

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Theres only 13 oz.s in it you'll have to recover it with a redclaim machine

Posted on Apr 21, 2009

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My Rheem air condtioner is not cooling. The thermostat is saying check air hander and heat pump.


Check the air handler for low airflow. If you have a dirty filter (you do change it, right?) it will cause the cooling coil to freeze solid. If you do not have a filter installed, the coil itself is probably clogged with dirt and ice - resulting in the same low airflow thru the coil. Replace the dirty filter and you should be all set. If the coil is dirty, you'll need to have it cleaned and a new filter installed.

The coil on the outdoor condenser needs to be clear of dirt and plants, too. The fan should spin freely while powered off, and run smoothly and quietly when powered on. Low airflow here (due to either dirt, blocked air flow or faulty fan will prevent efficient heat exchanging with the outside air.

Good luck!

Sep 18, 2015 | 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...

2 Answers

Can not blowing as hard as it should. Compressor kicking on but freezing up easily. Any ideas?


Check your filters and make sure that there is adequate airflow, also make sure that any drain tubes are not plugged.

Jul 03, 2015 | Heating & Cooling

2 Answers

Why does my ac freeze up


Hello, air conditioners will freeze either due to low airflow.....such as dirty filter, dirty evaporator coil, weak or not running blower motor. Also, a low refrigerant charge can cause the unit to freeze up.

Jul 09, 2012 | Danby Heating & Cooling

1 Answer

My ac keeps freezing up


You need to have the unit serviced . The freeze-up can be caused by blower failure while system is running or not coming on at the call for cool. Goodman has a thermal relay that bring the fan on after a short delay. Your evaporator coil may need to cleaned. You can have a low refrigerant charge. A lot of companies offer a low cost service check. We come out and do a thorough check of your system and can identify the source of your issues and sometimes freeze-ups can be caused by something as simple as a dirty air filter. I would start there first.

Jul 06, 2012 | Goodman Heating & Cooling

1 Answer

I have a Ruud Achieve model UPKB 060 CAZ that has a line that keeps freezing up when the thermostat is set to go below 76 degrees. The freon was checked and some was added. Also, the air handler is in...


Normally when the suction line freezes which is the larger of the 2 lines, #1, its low on freon again and unit has a leak. They are sealed systems and they should never need freon only if they develop a leak. So, this we know. Also, if the air filter is dirty and plugged, and the evaporator coil at the air handler is dirty will cause icing of lines and coil.Not enough air flow across the coil due to a dirty filter. When you set your thermostat to go below 76 degrees, the unit will work harder to keep up to bring the temperature down and if you have a leak which you do, the suction line will ice up. A Ruud 060 is a 5 ton btu unit, good size. Who ever added freon should have done a leak check on it. I would recommend you calling them out as it is low again and do a complete leak check, add dye to the system or there are many ways to do this. If the leak is not found it will continue to ice up. By E.P.A. standards, they cant keep adding freon, they must find the leak.This is all about you can do, is check and make sure you have a return air filter and its clean, and if it continues to ice, have them find the leak, repair it, and re-charge it. I wish you the best.
Sincerely,
Shastalaker7

Jun 18, 2010 | Heating & Cooling

1 Answer

Ac fan on, blowing air, but not cold


Check outside unit if unit and compressor are running feel the large line to see if it is cold. If compressor is running and line is not cold possible charge problems. You may have a capacitor problem outside. they go out quite often. You can change this yourself, Open up outside unit and the cap is the silver bullet with terminals out the top. Bad cap can cause compressor to not operate and also the fan. You need to clean the coil inside or at leat check the coil to see if it is clean. You can clean theis with a toilet brush do not go against the coil bit brush with the fins. You may need to call a service tech but try these options first. russ

Aug 15, 2009 | Heating & Cooling

1 Answer

Inside unit freezing


There are varius items that make the unit inside (air handler) freezes up .If the fan motor in the air handler doesn't work it'llice up.If the filter is dirty it'llfreezes up. If the coil in the air handler is dirty it will freezes up.And if the unit is low in refrigerant(freon) it'll ice up.If is low in gas means there's a leak and before recharged it needs to be fixed.

Apr 23, 2009 | Heating & Cooling

1 Answer

Indoor unit freezing up


The coil probably needs to be pulled and cleaned with a power washer. Usually what happens is the coil becomes dirty over time and when the filter starts to get dirty as well, it will cause the unit to free up. Also it could also be a little low on refrigerant and when the temps change, it can cause the coil to freeze up. But I bet it is in need of a good tune up and coil cleaning.

Mar 21, 2009 | Goodman CLQ36AR49 Air Conditioner

5 Answers

FREEZING COILS


Hi, Sounds like its low on refrigerant. Could also be restricted air flow inside. Turn the AC off and the inside fan on for about 3-4 hours to thaw out the evaporator. Replace the inside air filter. If you can see the side of the evaporator that the air goes into, check to see if it has a blanket of fuzz on it. If so, It can be cleaned with a credit card while its wet by scraping along with the fins. Turn the AC back on and let it run for about 20 minutes. The large line outside should sweat all the way to the compressor but the compressor should stay mostly dry. There may not be anything wrong with you unit. When it is cooler at night they will sometimes freeze if the thermostat is turned down too low during the night and the air restriction will not let it thaw during the day. Hope this helps. kstfas

Sep 19, 2007 | Carrier 38CKC042 Air Conditioner

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