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On the unit model/serial# tag there is three terms.what do they mean,compressor lra/rla and fan fla

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Compressor LRA ( locked rotor amps)meaning that if you hold that rotor and do not allow it to turn, it would draw that many amps.
Compressor RLA (rated load amps) meaning the amps the compressor will draw at a certain outdoor temperature usssually 95°.
Fan FLA (Full load amps) meaning that's the maximum amps the motor will run at continuosly.

Posted on Feb 10, 2010

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My islandaire ptac keeps tripping the breaker what should i look at?


If it were me I would use an amp meter and take an amp reading of the compressor when it is fully loaded. then I would refer to my name plat. which should be located on unit or if you can read label on compressor that is even better. FLA is fully loaded amps. RLA is running load amps, and LRA is locked rotor amps. if your amp readings is close to LRA or higher than FLA then I would recommend changing your compressor, The last thing you want is a compressor burn out.

Mar 08, 2013 | Heating & Cooling

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I would like to know how many square feet a Model # BRCQ0421BD Serial # 990905429 Coleman Central Air Conditioning Unit will cover. The unit supply is 208-230V 1 PH 60 Hz 10.8 RLA 97 LRA.


The Old Rule of Thumb is 400 square feet per ton, but you really need to do a heat load calculation to be safe. A lot of windows on the west or south side of the house will really increase your load and you may need a lot larger unit. Insulation also changes your load so you may be able to cool a larger area. You may be able to get the Heat Load Calculation Form either online or from Johnstone supply. They are on the internet.

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WHAT IS THE MAX AMP DRAW?


Max amp draw refers to the total amp draw of a unit , example : Compressor RLA 25 Amp, blower motor FLA 5 Amp, and condenser fan motor FLA is 1.5 amp , you add all three and get 31.5 Amps
which is your max amps, this is used in determining wire gauge and breaker size for unit.
This should help.

Jul 27, 2011 | Heating & Cooling

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The pipes had ice on the inside pipe and outside on the ac unit. All was shut off til ice melted. HVAC Tech was called in...motor, we were told needed to be replaced and so it was. New motor, new...


Ice forming on the suction side is normal and on really humid and hot days you will see it as the unit runs longer and the suction is very cold. I am not certain as to why the tech told you to use a sprinkler on the system unless he thought you had a Hi head pressure or he just wanted to calm your concerns regarding the icing as you say the fan came back on ????. .. now with all that said it appears something got wet and shorted out .. could be a number of things . the outdoor fan contactor, the tstate wiring, or the motor got wet and burned out... was the unit cooling well even with the ice? I think it should have .. let me know.

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1 Answer

My church has a roof top ac unit, model # GP-1360H41BA. The ratings plate has the following ratings: RLA 26.4 AND LRA 134. What is the KW draw of this unit 1. At startup 2. After startup?


RLA ( rate load amps/current) is the rate of unit ( usually about 65% against Max. load current < FLA/FLC>)
LRA ( Locked rotor amp/current)

Seems your AC use Y or Delta starter, so at start the current draws will between : 3X ( 26.4 to (26.4(1 +35%). And After start up the current draws will drop to 26.4 to 26.4(1+ 35%) in normal operation.
Remember, that the current draws also depending to the condition of your ac.

Nov 03, 2010 | Goodman Heating & Cooling

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What's the amperage on my Hotpoint Freezer? I want to calculate how much this unit is costing me in energy. Model number FV15CRB, serial number(?) AV 336553. Thanks!


Hi, to find out the total amperage of your unit, you should have a data plate most of the time, located inside with the compressor amperage, and both fan motor amps. If not inside, it will be outside of the unit. It will tell you the RLA and the FLA of each. It will also show the freon type and amount you use. Also, on top of your compressor is a plate that has the RLAmps on it also. This is what you need to find on this unit to help you on your calculations.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor

Jul 19, 2010 | Hotpoint Freezers

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When we turn on our central A/C the fan comes on & the compressor comes on for about 10 seconds & quits


Sounds like a compressor problem to me.Have you tried a hard start kit?This increases the starting torque.Put an amprobe around the common wire to the compressor and see the amperage draw is on start up.It sounds to me the compressor is cutting off on the internal overload.This is located inside the compressor on the common winding.There shoud be a tag on the condenser housing that gives you the info on the unit.Look for:FLA-full load amps,which is normal running amps and LRA-locked rotor amps,which tells you if the compressor is locked(bad).This will be a high number.If this is the case the compressor will have to be replaced.If it is an older A/C,I'd replace the condensing unit. And if possible, replace the indoor unit also.You'll be pleased with the results.Hope this helps. Gregg

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