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What is the difrent between LRA and BTU ? - Air Tools & Compressors

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One really has not much to do with the other directly



BTU - British Thermal Unit.- A heat measuring unit. IE:12,000 BTU (British Thermal Unit.) The amount of heat required to melt one ton of ice.


LRA - Lock Rotor Ampere-LRA is nothing but locked rotor current , generally it is located on compressors name plate, when ever pistons locked at a particular position the rotor does not move further at the time rotor draws large current, that current is located on name plate, by seeing that LRA we can know compressor rotor was locked

Posted on May 20, 2011

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How to calculate the capacity for the unit using LRA

Posted on Aug 20, 2017

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2 Answers

How many LRA in 20562BTU


That makes no sense. LRA is going to be for a motor or compressor. I've never heard of a 20562 BTU machine. You have to read the data plate on the machine, either indoor or outdoor unit will tell you. If you can't read the data plate turn the power off and look at the data plate on the actual motor itself. Good Luck!!

Apr 16, 2017 | Heating & Cooling

1 Answer

LRA how to convert in tonage so 10 LRA How many ton and 145 LRA Copland scroll compressor tonage value pleas give me answer


LRA on the data tag stands for "locked rotor amps" and has nothing to do with tonnage. In the model # there should be a number to use. And divide that # by 12 (12,000 btu/ton). So if I had a PFG24H200 it would be the "24"and a 2 ton unit

Jul 06, 2015 | Heating & Cooling

1 Answer

How to find out tonnage from lra


There is 12,000 Btu per ton. Multiply The voltage by the amps (current draw), that equals to watts. Multiply the watts by 3.413 and that is your Btu. Then divide by 12,000 and that's your tonnage.

Aug 28, 2013 | Heating & Cooling

3 Answers

Tonage or BTU/hour rating from Ruud name plate


See this link

http://www.epinions.com/specs/pr-GE_Zoneline_AZ55H07D_Air_Conditioner

Its say 7100 BTU/hr

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1 Answer

What is the cooling btu on my BDP company division of carrier


is this unit real old ? it does not come up in my book . the btu is 30000 that is the same as 2.5 ton it may be 6,7 or 8 seer i dont think its a 10 seer because the 10 seer units are listed and yours is not . if this sounds wrong please look up the mod # again and post the ser # too ......... Please if this answer helped , please rate this 3 or 4 stars . and keep me in the paid answer department . A 1 or 2 may knock me down into the unpaid ranks. Thanks Cactus Bob .

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1 Answer

Humming


A hum followed by a click sound is an indication of a failure at the compressor. Possibly the compressor motor has gone into a locked rotor condition. A locked rotor condition can be checked using an ammeter. The name plate on the compressor will have a rating after LRA. If the ammeter reading is equal to the LRA rating the compressor is done. If it is a reading of about 80% of the LRA (locked rotor amperage) it is possible that a relay or capacitor has failed which is replaceable.

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