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Have Rheem 5 ton heat pump with stacked coils poor cool.

Have Rheem 5 ton heat pump with stacked coils.
Only 3 rows on bottom and 2 rows top coil get
cold. unit will not cool house on hot day 83 degrees lnside, 92 outside. Freon 62 psi, filters clean, coils not to dirty very expensive to clean stacked coils. Compressor
still under warranty nothing else.

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If your sure on the psi your low on freon or your evaporator is restricted discharge psi would realy help.you will get best performance with a clean unit or pay expensive utility bill . Tom

Posted on Jun 18, 2009

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Brand New 2 weeks old 4 ton Trane compressor leaks a lot of water onto pad


If the unit is running in cold weather than there is ice building up on the coils located outside. This is normal in that the unit is running in heat pump mode heating inside and cooling outside, After the unit detects the ice build up it briefly reverses the cycle heating the outside coils melting(defrosting) the ice which you observe as water on the pad.

The video gives you an example of the defrost cycle!
2012 Trane XL15i Heat Pump Defrost Cycle Steam Show

Dec 21, 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...

1 Answer

2003 ford windstar spark plug wires diagram


I\'m assuming you have the 3.8 engine,although i believe the firing order is the same on all there v6 sideways mounted front wheel drive Windstars. That firing order is 1-4-2-5-3-6, with 1-2-3 going from left to right on the back side of the engine and 4-5-6 left to right on the front side of the engine.Looking straight down at the coil from the front of the car,you\'ll see 2 rows of coil terminals.The row on the right side is 1-2-3 going from top to bottom,row on left side is 6-5-4 going from top to bottom. Hook the number 1 coil terminal to the number 1 spark plug ,being careful to use the spark plug wire that is closest in length to the length you need. If your just replacing wires,yuo shouldn\'t have to much trouble. If your nreplacing the spark plugs you will find the ones in the rear,especially the number 2 [the middle one} are pretty difficult without removing the cowling. A total pain brought to you by the designers at Ford!

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1 Answer

Aircondition builds ice on coil


Either lack of refrigerant, stopped up metering device or capillary tube/s, or lack of air flow (due to bad blower motor, or dirty indoor coil) Good luck.

May 19, 2014 | Rheem Complete Split System Gas Furnace 5...

1 Answer

A/c on 3 ton 13 seer ruud heat pump not cooling


you have condenser issue. check at outside unit for 240 volts to contactor and 24 volts to contactor coil.

May 11, 2013 | Ruud 3 Ton Split System Heat Pump

1 Answer

Firing order in coils, cavalier, chevrolet, 99


STANDING IN FRONT OF CAR FROM LEFT TO RIGHT CYLINDERS ARE 1 2 3 4 NOW LOOKING AT COILS STANDING FRONT CAR THIS IS COIL SPARK PLUGS WIRES LOCATION WRITE THESE NUMBERS DOWN IN A ROW LIKE NUMBER 2 ON TOP 4 BOTTOM 2 3 1 4. THESE NUMBER IN A ROW IS WHERE YOURS SPARKS LOCATION FROM COILS TO CYLINDER SPARK PLUGS.

Mar 15, 2011 | Chevrolet Cavalier Cars & Trucks

2 Answers

I have a Rheem heat pump/air handler; it draws 2.9amps with only the fan running, 13amps when the heat pump is running and 38amps with the heat strips on. My question is why the unit draws that many amps...


Sounds like it must be about a 2.5- 3 ton system. The 13amps has to be the compressor draw -normal. and 38 on the strips- normal. 2.9 fan -normal.

You may want to check your wiring to see where the outside unit gets its power. Theres nothing inside that can draw 13 amps. That almost has to be the compressor power wire.

Jan 27, 2011 | Heating & Cooling

1 Answer

My 4 ton goodman heat pump goes into defrost and than after the cycle return in cooling stage at least the indoor coil starts freezing is the expansion valve working corectly


The reason for indoor coil freezing due to coil dust blocked-(Clean coil). 2. Less rpm of indoor f.motor. (Replace capacitor). 3. Short of gas. (Find leak and repair and then recharge gas.)

Jan 04, 2011 | Heating & Cooling

1 Answer

Just replaced inside fan motor on 5 ton Rheem heat pump. Fan will not spin freely. What to do?


1) remove power from the unit
2) remove panels enough to see where the squirrel cage fan is binding
3) these units are normally adjustable by loosening the bracket which holds the fan motor and simply moving it one way or another just a bit. (which is why understanding which end of the fan is binding is a GREAT second step, right after step 1, remove power from the unit, that includes shutting the emergency heat coils breakers OFF.
Don't worry, you're close to the solution!

Nov 25, 2009 | Ruud UBHC Air Conditioner

1 Answer

I am trying to determine the specs on my Rheem Criterion II lx2000 heating/AC unit unit installed in Sept 99, I blieve it was manufactured 2/5/99 based on AC Pump serial number 6263F259928697 Model RAMB...


rheems site is secure for dealers only but i can tell you. its a 3 ton unit 12 SEER R22 unit. The coil (rcga) is a 3 ton coil The AC is a 1999 and coil 1998. the # you have for the heater is accually just the honeywell gas valve. the model for the heater would be on the inside wall near the gas valve.

Sep 19, 2009 | Heating & Cooling

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